JP2007142360A - Radiator device and electronic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radiator device capable of improving a heat dissipation capability in the optimum combination of a jet stream generator with a radiator-based device or a heat transmission device and the like, and to provide an electronic apparatus with such an on-board radiator device. <P>SOLUTION: A radiator device 100 incorporates a jet stream generator 20 and a heat transmission device 31. The jet stream generator 20 has a vibrating plate in its housing 21 to generate a combined jet stream by discharging the air present in the housing from nozzles 22a and 22b through the vibration of this vibrating plate. The heat transmission device 31 is a heat transportation device which transports heat utilizing the phase transformation of a cooling medium by circulating the cooling medium by the use of a capillary tube force and the like as an example. For example, a heat pipe is used as the heat transportation device. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a heat dissipation device for releasing heat from a heat generation source and an electronic apparatus equipped with the heat dissipation device.

  Conventionally, an increase in the amount of heat generated from a heating element such as an IC (Integrated Circuit) associated with high performance of a PC (Personal Computer) has been a problem, and various heat radiation technologies have been proposed or commercialized. Yes. As a heat dissipation method, for example, there is a method in which a heat dissipation fin made of a metal such as aluminum is brought into contact with the IC, and heat from the IC is conducted to the fin to dissipate heat. Also, there is a method of dissipating heat by forcibly removing, for example, warm air in a PC housing by using a fan and introducing ambient low-temperature air around the heating element. Alternatively, there is a method of forcibly removing the warm air around the radiating fin by the fan while using the radiating fin and the fan together to increase the contact area between the heating element and the air with the radiating fin.

  However, in such forced convection of air by the fan, there is a problem that a temperature boundary layer on the surface of the fin occurs on the downstream side of the radiating fin, and heat from the radiating fin cannot be efficiently taken. In order to solve such a problem, for example, the temperature of the temperature boundary layer can be reduced by increasing the wind speed of the fan. However, increasing the number of rotations of the fan in order to increase the wind speed has a problem in that noise from the bearing portion of the fan or noise due to wind noise caused by the wind from the fan occurs.

On the other hand, as a method of destroying the temperature boundary layer without efficiently using a fan as a blowing means and efficiently releasing the heat from the radiating fins to the outside air, there is a method of using a diaphragm that reciprocates periodically (for example, Patent Documents). 1, 2, 3, 4). Among these devices, in particular, the devices of Patent Documents 3 and 4 are a diaphragm that spatially bisects the interior of the chamber, an elastic body that supports the diaphragm and is provided in the chamber, and a means that vibrates the diaphragm. It has. In these apparatuses, for example, when the diaphragm is displaced upward, the volume of the upper space of the chamber decreases, so that the pressure of the upper space increases. Since the upper space communicates with the outside air through the intake / exhaust port, a part of the air inside the upper space is released into the outside air due to the pressure increase in the upper space. On the other hand, at this time, since the volume of the lower space on the opposite side of the upper space across the diaphragm increases, the pressure in the lower space decreases. Since the lower space communicates with the outside air through the intake / exhaust port, a part of the outside air in the vicinity of the intake / exhaust port is drawn into the lower space due to the pressure decrease in the lower space. On the other hand, when the diaphragm is displaced downward, the volume of the upper space of the chamber increases, so that the pressure of the upper space decreases. Since the upper space communicates with the outside air through the intake / exhaust port, a part of the outside air near the intake / exhaust port is drawn into the upper space due to the pressure drop in the upper space. On the other hand, at this time, the volume of the lower space on the opposite side of the upper space across the diaphragm is conversely decreased, so that the pressure in the lower space increases. Due to the pressure increase in the lower space, part of the air inside is released into the outside air. For example, an electromagnetic drive system is used to drive the diaphragm. As described above, by reciprocating the diaphragm, the operation of discharging the air in the chamber to the outside air and the operation of sucking the outside air into the chamber are periodically repeated. The air pulsation induced by the periodic reciprocating motion of the diaphragm is blown to the radiating fins (heat sinks) etc., so that the temperature boundary layer on the surface of the radiating fins is efficiently destroyed, resulting in Therefore, the heat radiation fin is efficiently cooled.
Japanese Unexamined Patent Publication No. 2000-223871 (FIG. 2) JP 2000-114760 A (FIG. 1) JP-A-2-213200 (FIGS. 1 and 3) Japanese Patent Laid-Open No. 3-116961 (FIGS. 3 and 8)

  How to combine a jet generator that generates a jet as a pulsating flow as described above and a heat dissipation system such as a heat sink is an important issue from the viewpoint of heat dissipation capability. On the other hand, when the jet flow generator is built in an electronic device, it is required to make the jet flow generator and the surrounding heat dissipation system thinner.

  In view of the circumstances as described above, an object of the present invention is to mount a heat radiating device capable of improving the heat radiating capability by suitably combining a heat generating device or a heat transfer device with a jet flow generator, and the heat radiating device. To provide electronic equipment.

  Another object of the present invention is to provide a heat dissipation device and an electronic apparatus that can be reduced in thickness or size.

  Still another object of the present invention is to provide an electronic device capable of improving heat dissipation efficiency when a heat dissipation device is mounted.

  In order to achieve the above object, a heat dissipation device according to the present invention has a casing, a jet generator that generates a synthetic jet by discharging gas from the casing as a pulsating flow, and a first heat source. A heat transfer device for transferring heat to the housing.

  In the present invention, heat from the first heat generation source is transmitted to the casing of the jet flow generator by the heat transfer device, and the heat is transmitted to the gas contained in the casing. The jet generator can dissipate heat by discharging a gas having heat in the casing as a synthetic jet.

  A synthetic jet is a jet in which a gas jet discharged from a casing is synthesized by entraining the surrounding gas due to a pressure difference between the jet and the surrounding gas.

  The jet flow generator is configured to discharge gas in a pulsating flow and to suck gas outside the housing into the housing in synchronization with the cycle. Therefore, a gas having heat does not stay in the housing.

  The “heat transfer device” includes a heat conductive member (for example, a metal member, a carbon material, a ceramic, or a heat conductive sheet). Alternatively, as will be described later, a heat transport device that transports heat by phase change of the refrigerant is included. The same applies hereinafter.

  Examples of the gas include air, but are not limited thereto, and may be nitrogen, helium gas, argon gas, or other gases. The same applies hereinafter.

  In the present invention, the heat transfer device is a first heat transport device that transports heat of the first heat source by a phase change of the refrigerant. In this case, the heat absorption side of the first heat transport device is thermally connected to the first heat generation source, and the heat dissipation side is thermally connected to the housing. “Thermal connection” means that the first heat transport device and the housing are directly connected, or the two are connected via a member (not including fluid) that can conduct heat. Means that The same applies hereinafter.

  In the present invention, the heat dissipation device further includes a heat sink to which the gas discharged from the jet flow generator is blown. In the present invention, the gas having heat discharged from the housing is blown to the heat sink, and the heat is released from the heat sink. Since the gas discharged from the jet generator is a synthetic jet, the gas outside the casing (gas having a lower temperature than that in the casing) is supplied to the heat sink while being entrained in the jet. Thereby, the heat dissipation capability can be increased.

  In the present invention, the heat dissipation device further includes a second heat transport device that is thermally connected to the heat sink and transports heat by a phase change of the refrigerant to transmit heat of the second heat source to the heat sink. It has. The present invention is particularly effective when there are two or more heat sources.

  In the present invention, the first heat transport device is connected to the casing by caulking or soldering. Thereby, the resistance of heat transfer can be reduced as much as possible, and the first heat transport device and the housing can be connected.

  In the present invention, the housing includes a portion made of a metal to which the first heat transport device is thermally connected. Thereby, the thermal conductivity from the first heat transport device to the housing can be enhanced.

  In this invention, the said housing | casing has a recessed part or a hole in the position where this 1st heat transport device contacts so that the said 1st heat transport device may be fitted. Thereby, the width | variety or thickness of a thermal radiation apparatus can be made small, and size reduction or thickness reduction can be implement | achieved.

  In the present invention, the jet flow generator includes a vibrating body capable of applying a pressure change to the gas in the housing in order to discharge the gas, and a driving body that drives the vibrating body, The casing has an opening through which the gas can be discharged by the vibration of the vibrating body. There may be one or two chambers in the housing. When there are a plurality of vibrators, there may be three or more chambers. As a driving method of the driving body, for example, electromagnetic action, piezoelectric action, or electrostatic action can be used.

  In the present invention, the jet flow generator is separated by the vibrating body in the vibration direction of the vibrating body in the housing, and the first and second chambers containing the gas and the first and second chambers are included. And a metal plate constituting a part of the housing. Since the metal plate has higher strength than, for example, resin, the casing can be made thinner. In addition, for example, when the vibrating body is an electromagnetic motor and the vibrating body is in the housing, the leakage magnetic field can be suppressed by the metal plate. In this case, in order to exhibit the magnetic shielding effect, it is preferable to use a metal plate having a high magnetic permeability.

  Furthermore, if the first heat transport device is thermally connected to the metal plate, the heat dissipation capability of the heat dissipation device can be increased.

  In the present invention, the metal plate is disposed on the first chamber side of the first and second chambers, and the driver constitutes a part of the casing on the second chamber side. It consists of an electromagnetic motor with a yoke. Thus, the yoke which a motor has comprises a part of housing | casing, and it can achieve thickness reduction of a jet flow generator. Further, the presence of the metal plate can shield the leakage magnetic field from the yoke on the first chamber side.

  In the present invention, the vibrating body and the driving body constitute a speaker included in an electronic device on which the heat dissipation device is mounted, and the jet generator generates sound generated from the speaker through the opening. To the outside. Thereby, it becomes possible to discharge | release the heat | fever of a 1st heat-generation source outside the electronic device using the speaker of an electronic device.

  A heat radiating device according to another aspect of the present invention includes a housing, a jet generator that generates a synthetic jet by discharging gas from the housing as a pulsating flow, and the gas discharged from the housing And a heat transfer device for transferring the heat of the heat source to the heat sink.

  In the present invention, gas is blown to the heat sink by the jet flow generator. Thereby, the heat sink with the heat transferred from the heat source via the heat transfer device can be cooled.

  An electronic apparatus according to the present invention includes a heat generation source, an outer casing incorporating the heat generation source, a casing, and a jet generator that generates a synthetic jet by discharging gas from the casing as a pulsating flow. And a heat transfer device that transfers heat of the heat source to the housing.

  Electronic devices include computers (in the case of personal computers, laptop computers or desktop computers), PDAs (Personal Digital Assistance), electronic dictionaries, cameras, display devices, audio / visual devices, A projector, a mobile phone, a game device, a car navigation device, a robot device, other electric appliances, and the like can be given. The same applies hereinafter.

  In this case, the heat transfer device may have a form containing alumina, aluminum nitride, silicon carbide, thermally conductive ceramics, or silicon nitride. The outer casing may be formed of a metal such as aluminum, magnesium alloy, stainless steel, or a resin having high thermal conductivity.

  In the present invention, the jet flow generator includes a speaker having a vibrating body capable of changing a pressure of the gas in the casing in order to discharge the gas, and the casing includes the outer casing. Provided in a part constituting a part and a part constituting a part of the outer casing, the gas can be discharged to the outside of the outer casing, and a sound generated from the speaker is emitted from the outer casing. And an opening capable of outputting to the outside. In particular, when the electronic device is a video shooting device, HD (High Definition) has been progressing in recent years, and the amount of heat generation has increased, so the present invention is effective. In addition, since the speaker and the vibrating body of the jet flow generator are shared, the electronic device can be downsized.

  In the present invention, the electronic device further includes control means for controlling the vibrating body to vibrate at a frequency other than an audible frequency range. For example, the control means can control the vibrating body to vibrate at a frequency other than the audible frequency range when the speaker is not used as a speaker.

  In the present invention, the jet flow generator has a piezoelectric device capable of applying a pressure change to the gas in the housing in order to discharge the gas. Thus, the synthetic jet can also be generated by vibrating the piezoelectric device.

  In this case, the electronic apparatus may be a video shooting apparatus having a speaker that outputs sound by vibrating the piezoelectric device.

  Moreover, the piezoelectric device can realize a reduction in size of an electronic device by constituting a part of the casing.

  In the present invention, the outer casing may have an opening on a bottom surface, and the electronic device may further include a leg portion provided so as to protrude from the bottom surface. Thereby, even when the first opening is provided on the bottom surface of the outer casing, a space is created between the surface on which the electronic device is placed and the opening by providing the leg portion. Ventilation can be promoted to release heat from the heat source.

  In the present invention, the outer casing includes a first opening for sucking the gas into the outer casing, and a second opening for discharging the synthetic jet to the outside of the outer casing, The electronic device may further include a wall portion provided in the outer casing so as to inhibit the flow of the gas between the first opening and the second opening. Thereby, it is possible to prevent the warm synthetic jet discharged from the second opening from being drawn back from the first opening and sucked into the outer casing, and to efficiently dissipate heat.

  In this case, the first opening is provided on the bottom surface of the outer casing, and the wall portion forms a flow path for guiding the gas from the outer peripheral side of the outer casing to the first opening together with the outer casing. As described above, it may be provided on the bottom surface. This prevents the synthetic jet from being pulled back to the first opening, and even when the first opening is provided on the bottom surface of the outer casing, the heated gas around the bottom surface of the outer casing by the heat source inside the outer casing. Can be prevented from being sucked from the first opening, and a gas having a low temperature can be led to the first opening from the outer peripheral side of the outer casing, so that heat can be efficiently radiated.

  In this case, the first opening may be provided on the bottom surface of the outer casing, and the wall portion may be provided on the bottom surface so as to be a leg portion of the outer casing. Accordingly, the wall portion and the leg portion of the outer casing can be used together, and heat can be efficiently radiated while promoting ventilation inside and outside the outer casing.

  In the present invention, the electronic device includes a first outer housing that includes the heat generation source, the jet flow generator, and the heat transfer device, and a display unit that opens and closes with respect to the first outer housing. A laptop computer having a second outer casing connected to the first outer casing, the first outer casing being an upper surface of the first outer casing, and a rear surface of the first outer casing; A first opening for inhaling the gas into the first outer casing provided at a position on the back side of the display unit in a state where the second outer casing is opened; Provided on the bottom surface of the outer casing, and provided on the rear surface for discharging the gas into the first outer casing, and for discharging the synthetic jet to the outside of the first outer casing. And a leg portion provided so as to protrude from the bottom surface.

  As a result, in the state where the second outer casing is opened, the straight-forward sound to the user that is generated from the first to third openings due to intake or exhaust is blocked by the first and second outer casings. The noise felt by the user can be minimized. In addition, by providing openings for intake air on the top and bottom surfaces of the first outer casing, intake efficiency can be improved and heat dissipation efficiency can be improved.

  In this case, a wall portion may be further provided on the side surface side of the second opening so as to protrude from the bottom surface along the side surface of the first outer casing. Thereby, sound leakage from the side surface side of the first outer casing can be prevented, and the silence can be further improved.

  An electronic apparatus according to another aspect of the present invention includes a heat generator, a casing, a jet generator that generates a synthetic jet by discharging gas from the casing as a pulsating flow, and a discharge from the casing. A heat sink to which the gas is blown, and a heat transfer device for transferring heat of the heat source to the heat sink.

  In the present invention, the outer casing may have an opening on a bottom surface, and the electronic device may further include a leg portion provided so as to protrude from the bottom surface. Thereby, even when the first opening is provided on the bottom surface of the outer casing, by providing the leg portion, ventilation inside and outside the outer casing can be promoted and the heat source can be dissipated.

  In this case, the outer casing has a first opening for sucking the gas into the outer casing and a second opening for discharging the gas blown to the heat sink to the outside of the outer casing. The electronic apparatus may further include a wall portion provided in the outer casing so as to inhibit the flow of the gas between the first opening and the second opening. Thereby, it is possible to prevent the warm synthetic jet discharged from the second opening from being drawn back from the first opening and sucked into the outer casing, and to efficiently dissipate heat.

  In this case, the first opening is provided on the bottom surface of the outer casing, and the wall portion forms a flow path for guiding the gas from the outer peripheral side of the outer casing to the first opening together with the outer casing. As such, it may be provided on the bottom surface. Accordingly, the synthetic jet can be prevented from being pulled back to the first opening, and a gas having a low temperature can be guided from the outer peripheral side of the outer casing to the first opening, so that heat can be efficiently radiated.

  Further, as described above, when the outer casing has the first and second openings and the electronic apparatus has a wall portion, the first opening is provided on the bottom surface of the outer casing, and the wall portion May be provided on the bottom surface so as to be the legs of the outer casing. Thereby, the wall part and the leg part of the outer casing can be used together.

  In the present invention, as described above, in the case where the electronic apparatus is configured to include the heat source, the jet generator, the heat sink, and the heat transfer device, the electronic apparatus includes the heat source, the jet generator, and the heat generator. A laptop computer having a first outer housing containing a transmission device and a second outer housing having a display unit and connected to the first outer housing so as to be openable and closable; 1 is an upper surface of the first outer housing, and a position near the back surface of the first outer housing and on the back side of the display unit when the second outer housing is opened. The first opening for sucking the gas into the first outer casing and the bottom surface of the first outer casing for sucking the gas into the first outer casing A second opening for providing a gas blown to the heat sink provided on the back surface A third opening for discharging the serial first outer casing outside, may have a leg portion which is provided so as to protrude from the bottom surface.

  Accordingly, it is possible to improve the noise reduction by blocking the straight sound to the user generated from the first to third openings, and to improve the heat radiation efficiency by providing two openings for intake. Can do.

  In this case, you may further comprise the wall part provided in the said side surface side rather than the said 2nd opening so that it might protrude from the said bottom face along the side surface of the said 1st outer housing. Thereby, sound leakage from the side surface side of the first outer casing can be prevented, and the silence can be further improved.

  An electronic apparatus according to still another aspect of the present invention includes a heat source, an outer housing that includes the heat source, a fan that discharges gas from the housing, and heat generated from the heat source. And a heat transfer device for transferring to the housing. Examples of the fan include an axial fan and a centrifugal fan, and a centrifugal fan is particularly preferable.

  An electronic apparatus according to still another aspect of the present invention includes a heat source, a housing, a jet generator that generates a synthetic jet by discharging gas from the housing as a pulsating flow, the heat source, and An outer casing having the jet generator and having a first opening on the bottom surface, and a leg portion provided so as to protrude from the bottom surface.

  Thus, the heat source can be dissipated by discharging the gas introduced from the first opening and warmed by the heat source as a synthetic jet from the first opening. Even when the first opening is provided on the bottom surface of the outer casing, the provision of the leg portion creates a space between the surface on which the electronic device is placed and the opening, thus promoting ventilation inside and outside the outer casing. And heat dissipation efficiency can be improved. Here, the heat generation source includes not only an object such as an IC that generates heat itself but also an object that conducts heat from another heat generation source such as a heat sink.

  An electronic apparatus according to still another aspect of the present invention includes a heat source, a housing, a jet generator that generates a synthetic jet by discharging gas from the housing as a pulsating flow, the heat source, and An outer casing having a built-in jet flow generator and having a first opening for sucking the gas; and a second opening for discharging the synthetic jet; and the first opening in the outer casing. And a wall portion provided so as to inhibit the flow of the gas between the second opening and the second opening.

  Thereby, the heat source can be dissipated by discharging the gas heated by the heat source as a synthetic jet from the opening on the bottom surface of the outer casing. Further, by providing the wall portion, it is possible to prevent the warm synthetic jet discharged from the second opening from being drawn back from the first opening and sucked into the outer casing, and to efficiently dissipate heat.

  In this case, the first opening is provided on the bottom surface of the outer casing, and the wall portion forms a flow path for guiding the gas from the outer peripheral side of the outer casing to the first opening together with the outer casing. As described above, it may be provided on the bottom surface. Accordingly, the synthetic jet is prevented from being pulled back to the first opening, and even when the first opening is provided on the bottom surface of the outer casing, a low-temperature gas is supplied from the outer peripheral side of the outer casing to the first opening. Therefore, it is possible to efficiently dissipate heat.

  In this case, the first opening may be provided on the bottom surface of the outer casing, and the wall portion may be provided on the bottom surface so as to be a leg portion of the outer casing. Thereby, the wall part and the leg part of the outer casing can be used together.

  Further, as described above, when the electronic device is configured to include a heat generation source, a jet flow generator, an outer casing, and a leg, the electronic device includes the heat generation source and the jet flow generator, and stores the gas. A wrap having a first outer casing having the first opening on the bottom surface for inhalation, and a second outer casing having a display unit and connected to the first outer casing so as to be openable and closable. In the top type computer, the first outer casing is an upper surface of the first outer casing, and the second outer casing is opened in the vicinity of the rear surface of the first outer casing. A second opening for sucking the gas into the first outer casing; and a rear surface provided at a position on the back side of the display unit; and the synthetic jet is disposed outside the first outer casing. And a third opening for discharging the gas. Accordingly, in the laptop computer, the second outer casing provided with the display unit is used to cut off the straight-forward sound to the user generated from the first to third openings, thereby reducing the noise. In addition, it is possible to improve the heat dissipation efficiency by providing openings for intake air on the upper surface and the bottom surface of the first outer casing.

  In this case, a wall portion may be further provided on the side surface side of the second opening so as to protrude from the bottom surface along the side surface of the first outer casing. Thereby, sound leakage from the side surface side of the first outer casing can be prevented, and the silent effect can be further improved.

  As described above, according to the present invention, it is possible to improve the heat dissipation capability by suitably combining a heat generating device or a heat transfer device with the jet flow generator. Further, the heat dissipation device can be reduced in thickness or size. Furthermore, the heat dissipation efficiency when the heat dissipation device is mounted on the electronic device can be improved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  Before describing a heat dissipation device according to an embodiment of the present invention, an embodiment of a jet flow generator will be described first.

  FIG. 1 is a perspective view showing a jet generator according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of the jet generator shown in FIG.

  The jet generator 10 includes a casing 1 having a cylindrical rear portion and a vibration device 15 disposed in the casing 1. A plurality of nozzles 2 a and 2 b are arranged on the front surface 1 a of the housing 1. As shown in FIG. 2, the inside of the housing 1 is separated into an upper chamber 11a and a lower chamber 11b by a vibration device 15 and a mounting portion 7 to which the vibration device 15 is attached. Openings 12a and 12b are formed on the front surface 1a of the housing 1 to which the nozzles 2a and 2b are attached at positions corresponding to the nozzles 2a and 2b. Thereby, the upper chamber 11a and the lower chamber 11b communicate with the atmosphere outside the housing 1, respectively. The chambers 11a and 11b have substantially the same volume. That is, the upper chamber 11a is thicker in the vertical direction (thickness direction) in FIG. 2 than the lower chamber 11b because the vibration device 15 is disposed in the upper chamber 11a. Thereby, as will be described later, the amount of gas discharged alternately from the nozzles 2a and 2b can be made the same, and the quietness is improved.

  The shape of the housing 1 is not limited to the shape shown in FIG. 1, and may be a rectangular parallelepiped shape, a cylindrical shape, or other shapes.

  The vibration device 15 has a configuration similar to, for example, a speaker. The vibration device 15 includes a frame 4, an actuator 5 attached to the frame 4, and a vibrating body (vibrating plate) 3 supported on the frame 4 by an elastic support member 6. The diaphragm 3 has a disk shape, for example. The diaphragm 3 is not limited to a disc shape, and may be an ellipse or a rectangle according to the shape of the housing 1. Alternatively, the diaphragm 3 is not limited to a plate shape, and may have a three-dimensional shape provided with a side plate (not shown) to ensure rigidity. The frame 4 is formed with a circulation port 4 a for circulating the air contained in the housing 1 inside and outside the frame 4.

  The diaphragm 3 is made of, for example, resin, paper, or metal. In particular, the vibration plate 3 is made of paper, so that the weight is extremely reduced. Paper is not as easy to make in an arbitrary shape as resin, but it is advantageous in reducing the weight. When the diaphragm 3 is a resin, it can be easily formed into an arbitrary shape by molding. On the other hand, when the diaphragm 3 is a metal, there is a light material such as magnesium that can be injection-molded, so that it can be used depending on the case.

  FIG. 3 is an enlarged cross-sectional view showing the actuator 5. A magnet 14 magnetized in the vibration direction R of the diaphragm 3 is built inside the cylindrical yoke 8, and a disk-shaped yoke 18, for example, is attached to the magnet 14. A magnetic field as shown in FIG. 4 is generated by the magnet 14 and the yokes 8 and 18 to form a magnetic circuit. A coil bobbin 9 around which a coil 17 is wound enters and leaves the space between the magnet 14 and the yoke 8. That is, the actuator 5 is a voice coil motor. For example, an electric signal is supplied to the actuator 5 from a driving IC (not shown) through the feeder line 16. The yoke 8 is fixed to the inner center of the frame 4, and the coil bobbin 9 is fixed to the surface of the diaphragm 3. The flat yoke 18 has, for example, a disk shape as described above. However, an ellipse or a rectangle may be used instead of a circle. The actuator 5 can vibrate the diaphragm 3 in the direction of the arrow R.

  The housing 1 is made of, for example, resin, rubber, or metal. Resin and rubber are easy to produce by molding and are suitable for mass production. Further, when the housing 1 is made of resin or rubber, it is possible to suppress sound generated by driving the actuator 5 or airflow sound generated by vibration of the diaphragm 3. That is, when the housing 1 is made of resin or rubber, the attenuation rate of those sounds also increases, and noise can be suppressed. Furthermore, it can respond to weight reduction and becomes low-cost. When the housing 1 is manufactured by injection molding of resin or the like, it can be molded integrally with the nozzles 2a and 2b. When the housing 1 is made of a material having high thermal conductivity, for example, metal, the heat generated from the actuator 5 can be released to the housing 1 and radiated to the outside of the housing 1. Examples of the metal include aluminum and copper. When considering thermal conductivity, carbon is not limited to metal. As the metal, magnesium that can be injection-molded can be used. When the leakage magnetic field from the magnetic circuit of the actuator 5 affects other devices of the device, it is necessary to devise to eliminate the leakage magnetic field. One of them is to make the housing 1 from a magnetic material such as iron. Thereby, the leakage magnetic field is reduced to a considerable level. Further, it may be a ceramic case for use at high temperatures or for special applications.

  As described above, when a highly heat conductive material is used for the housing 1 for heat dissipation, it is preferable that the frame 4 is also made of a material having high heat conductivity. In this case, the frame 4 is also made of metal or carbon. However, if the heat conduction is not considered much, the frame 4 is made of resin, for example. If it is resin, an inexpensive and lightweight frame can be produced by injection molding. A part of the frame 4 may be a magnetic material. Thereby, the yoke of the actuator 5 can be comprised with the magnetic body, and it is also possible to raise a magnetic flux density.

  The elastic support member 6 is made of, for example, rubber or resin. The elastic support member 6 has a bellows shape, and has an annular shape when viewed from above. Although the diaphragm 3 is mainly supported by the actuator 5, the elastic support member 6 has a function of supporting the vibrating body 3 in order to prevent lateral vibration that is a vibration perpendicular to the vibration direction R of the diaphragm 3. have. Further, as described above, the elastic support member 6 separates the chambers 11a and 11b, and prevents the gas from flowing between the chambers 11a and 11b when the vibrating body 3 vibrates.

  In addition, although it was set as the structure in which the nozzles 2a and 2b were provided in the housing | casing 1, you may be the structure in which the opening was provided in the housing | casing 1 instead of a nozzle.

  Operation | movement of the jet generator 10 comprised as mentioned above is demonstrated.

  For example, when a sinusoidal AC voltage is applied to the actuator 5, the vibrating body 3 performs sinusoidal vibration. Thereby, the volume in chamber 11a and 11b increases / decreases. As the volumes of the chambers 11a and 11b change, the pressures in the chambers 11a and 11b change, and accordingly, an air flow is generated as a pulsating flow through the nozzles 2a and 2b, respectively. For example, when the vibrating body 3 is displaced in a direction that increases the volume of the chamber 11a, the pressure in the chamber 11a decreases and the pressure in the chamber 11b increases. Thereby, the air outside the housing 1 flows into the chamber 11a through the nozzle 2a, and the air in the chamber 11b is jetted out through the nozzle 2b. On the contrary, when the vibrating body 3 is displaced in the direction of decreasing the volume of the chamber 11a, the pressure of the chamber 11a increases and the pressure of the chamber 11b decreases. Thereby, the air in the chamber 11a is ejected to the outside through the nozzle 2a, and the external air flows into the chamber 11b through the nozzle 2b. When air is ejected from the nozzles 2a and 2b, the air pressure around the nozzles 2a and 2b decreases, so that the ambient air is caught in the air ejected from each nozzle. That is, this is a synthetic jet. By blowing such a synthetic jet onto a heating element such as a heat sink or a high-heat part, the heating element or the high-heat part can be cooled.

  On the other hand, when air is ejected from the nozzles 2a and 2b, noise is generated independently from the nozzles 2a and 2b. However, since each sound wave generated by each nozzle 2a and nozzle 2b is an anti-phase sound wave, it is weakened mutually. As a result, noise is suppressed, and noise reduction can be achieved.

  FIG. 5 is a sectional view showing a jet generator according to another embodiment of the present invention. 6 is a cross-sectional view taken along line AA in FIG. 5 and 6, the same members and functions as those of the jet flow generator 10 shown in FIG. 1 will be described briefly or omitted, and different points will be mainly described.

  In the jet flow generator 20, the nozzle portion 22 and the housing 21 are configured as separate parts. The reason for being configured as separate parts in this way is that the nozzle portion 22 and the housing can be integrally formed, and the manufacture becomes easy. The nozzle part 22 has a plurality of nozzles 22a and a plurality of nozzles 22b. The front surface of the housing 21, that is, the side of the housing 21 where the nozzle portion 22 is disposed is opened, the chamber 21a communicates with the region 26a inside the nozzle portion 22, and the chamber 21b communicates with the region 26b. . As shown in FIG. 6, the chamber 21a and the chamber 21b are divided by a partition member 24 to which the elastic support member 6 is attached on the front side (left side in the figure). The feeder line 16 is connected to a terminal block (or circuit board) 23 attached to the back side of the housing 21. The feed line 16 in FIG. 1 may be configured similarly to FIG.

  The cylindrical yoke 8 of the actuator 5 constitutes a part of the housing 21, and the yoke 8 is exposed to the outside of the housing 21. Thus, by attaching the actuator 5 to the housing | casing 1, compared with the jet flow generator 10 of FIG. 1, the height direction in the figure, ie, thickness, of the jet flow generator 20 becomes thin.

  FIG. 7 is a perspective view showing a heat dissipation device according to an embodiment of the present invention.

  The heat dissipation device 100 includes the jet flow generator 20 and the heat transfer device 31 shown in FIGS. 5 and 6 described above. The heat transfer device 31 is, for example, a heat transport device that circulates a refrigerant using capillary force or the like and transports heat by a phase change of the refrigerant. For example, a heat pipe is used as the heat transport device. It is not limited to a pipe shape like a heat pipe, but may be a plate-like and thin heat transport device.

  For example, a heat spreader 29 is connected to the heat absorption side 31 a of the heat pipe 31. A heat source 105 such as an IC is attached to the heat spreader 29. A heat radiation side 31 b of the heat pipe 31 is connected to the upper surface of the casing 21 of the jet flow generator 20. The heat pipe 31 may be bonded to the housing 21 with an adhesive or the like. Alternatively, as shown in FIG. 8, for example, if the connection is made by solder 33, the heat transfer property is improved.

  Alternatively, the heat pipe 31 may be connected to the housing 21 by caulking. In this case, specifically, as shown in FIG. 9 and FIG. 10, a hole for inserting the heat pipe 31 is formed in a part of the housing 21, and the heat pipe 31 is inserted into the hole from the outside. The entire casing 21 is pressurized to plastically deform the casing 21. The portion of the housing through which the heat pipe 31 passes may not be a hole but a recess. With the configuration as shown in FIGS. 9 and 10, the thickness of the heat dissipation device can be reduced, and downsizing or thinning can be realized.

  Furthermore, it is also possible to use a material with high thermal conductivity for the portion of the casing 21 to which the heat radiation side 31b of the heat pipe 31 is connected. Examples of the material include metals such as iron, copper, and aluminum, and materials containing carbon. The entire housing 21 may be made of metal. When a metal material is used for the casing 21, the strength is increased as compared with a resin or the like, and the metal plate can be made thinner by that amount.

  The operation of the heat dissipation device shown in FIGS. 7, 8 and 9 will be described. Heat generated from the heat source 105 is absorbed by the heat absorption side 31 a of the heat pipe 31 through the heat spreader 29. The heat pipe 31 transmits absorbed heat to the housing 21 by releasing it from the heat radiating side 31 b, and heat is transmitted to the air in the housing 21. As the jet flow generator 20 operates, the air in the casing 21 having heat is alternately discharged from the nozzles 22a and 22b and radiated as described above.

  With such a configuration and operation of the heat dissipation device 100, even when the heat source 105 and the jet flow generator 20 are arranged apart from each other, heat can be efficiently radiated.

  FIG. 11 is a perspective view showing a heat dissipation device according to another embodiment of the present invention. In the following description, the same members and functions of the heat dissipation device 100 shown in FIG. 7 will be described briefly or omitted, and different points will be mainly described.

  The heat radiating device 110 is configured by further including a heat sink 35 and a second heat pipe 131 connected to the heat sink 35 in the heat radiating device 100 shown in FIG. In the heat pipe 131, the heat radiation side 131 b is connected to the heat sink, and the heat absorption side 131 a is connected to the second heat generation source 205 via the heat spreader 129. The second heat source 205 is, for example, an IC. When the heat dissipation device 110 is mounted on a PC, for example, the first heat source 105 is, for example, a CPU, and the second heat source 205 is, for example, a graphic chip. However, it goes without saying that the heat source is not limited to these specific examples. The nozzles 22a and 22b of the jet flow generator 20 are arranged so that gas is discharged from the nozzles 22a and 22b between the fins of the heat sink 35, for example.

  With such a configuration of the heat dissipation device 110, the heat of the second heat source 205 is transmitted to the heat sink 35 via the second heat pipe 131. On the other hand, the synthetic jet is blown onto the heat sink 35 by the operation of the jet generator 20. That is, not only the air having heat in the housing 21 but also the cooled air around the housing 21 is supplied to the heat sink 35. In this way, the heat of the first and second heat sources 105 and 205 is finally released from the heat sink 35.

  With the heat dissipation device 110 according to the present embodiment, a thermal resistance improvement result of about 20% was obtained compared to the heat dissipation device 100 according to the embodiment of FIG.

  FIG. 12 is a perspective view showing a heat dissipation device according to still another embodiment of the present invention.

  The heat dissipation device 120 includes a jet flow generator 20, a heat sink 35, a heat pipe 131, and a heat spreader 129. Even with such a configuration, the heat of the heat source 205 can be released through the heat sink 35.

  FIG. 13 is a plan view showing a heat dissipation device according to still another embodiment of the present invention. FIG. 14 is a rear view of the heat dissipation device shown in FIG. 13.

  The heat dissipation device 130 includes a double jet generator 40 in which housings 251 and 351 of two jet generators are integrated. Hereinafter, one casing including all the integrated casings 251 and 351 is referred to as “casing 202”. The casing 202 can be integrally formed with a mold or the like, for example. The jet generator 40 has an actuator 5 for each of the casings 251 and 351, and includes two chambers for each of the casings 251 and 351 as shown in FIG. That is, the jet flow generator 40 has a total of four chambers in the housing 202. A nozzle part 222 having a plurality of nozzles 222 a is attached to the front surface of the housing 202. Below the nozzles 222a, the same number of nozzles (not shown) are arranged as the nozzles 222a. A heat sink 135 having a length equal to or close to the length of the nozzle is disposed on the front side of the nozzle portion 222. A substrate 23 on which an IC or the like for driving each actuator 5 is mounted is attached to the back surface of the housing 202.

  As shown in FIG. 14, concave portions (which may be referred to as groove portions or step portions) 202 a and 202 b are formed on both sides of the housing 202. Heat pipes 141 and 241 that are thermally connected to the heat spreaders 29 and 129 pass through the recesses 202a and 202b, respectively. Thus, there is no structural problem even if the recesses 202a and 202b are provided at both ends of the housing 202. A portion restricted in the thickness direction is a portion where the actuator 5 is provided, and there is no problem even if a concave portion is provided except for this portion.

  A heat source (not shown) is thermally connected to the heat spreaders 29 and 129. In this case, the heat source is a CPU, a graphic chip, or the like, but is not limited thereto. The heat absorption sides 141a and 241a of the heat pipes 141 and 241 are thermally connected to the heat spreaders 29 and 129, respectively, and the heat dissipation sides 141b and 241b are thermally connected to the heat sinks 135, respectively. As a result, heat from two heat sources (not shown) is transmitted to the heat sink 135, and heat is released from the heat sink 135 by the combined jet generated from the jet generator 40.

  In the present embodiment, since the heat pipes 141 and 241 are disposed in the recesses 202a and 202b of the housing 202, respectively, the thickness of the jet generator 40 including the heat pipes 141 and 241 can be reduced. .

  FIG. 15 is a cross-sectional view showing the jet flow generator in which the metal plate is used as a part of the housing as described above.

  The jet generator 30 is shown upside down from the jet generator described so far. In this way, upside down, for example, when the jet flow generator 30 is incorporated in a housing of an electronic device (not shown) such as a PC, the chamber 41b on the side where the actuator 5 is disposed is down, This is to show that the jet flow generator 30 is arranged so that the chamber 41a faces upward. However, when the jet flow generator 30 is incorporated in an electronic device, it is not necessarily arranged upside down in this way.

  The top plate 43 of the casing 41 of the jet flow generator 30 is made of metal as described above. If the heat dissipation side of the heat pipe 31 described above is connected to the metal plate 43, the thermal conductivity from the heat pipe 31 to the housing 43 can be increased. When the metal plate 43 is used in this way, the strength is increased compared to a resin or the like, and the metal plate 43 can be made thinner by that amount, so that the jet flow generator 20 and thus the heat dissipation device 100 can be made thinner. For example, in this case, sufficient rigidity can be obtained even if the metal plate 43 is as thin as about 0.5 mm. In the case of a resin, if the thickness is about 0.5 mm, the resin is bent or broken immediately, and the shape cannot be maintained.

  Furthermore, when the metal plate 43 is a magnetic body, it is possible to prevent the magnetic field of the magnetic circuit composed of the magnet 14 of the actuator 5 and the yokes 8 and 18 from leaking upward from the metal plate 43. For example, when this jet flow generator 30 is incorporated in a housing of an electronic device such as a PC (not shown), it is conceivable that various electronic components (not shown) are arranged on the metal plate 43. In that case, the concern that the electronic component is adversely affected by the magnetic shielding effect of the metal plate 43 is reduced. Examples of the magnetic material include iron, permalloy, silicon steel plate, and SPCC (cold rolled steel plate).

  In addition, as described above, the housing 202 illustrated in FIG. 13 may be partially or entirely made of metal. Alternatively, part or all of the housing 202 may be made of a magnetic material.

  FIG. 16 is a perspective view illustrating an example of an electronic device in which a heat dissipation device according to another embodiment is incorporated. 17 is a perspective view of the electronic device shown in FIG. 16 as seen from the substantially opposite side.

  The electronic device 210 is a video shooting device (hereinafter referred to as a video camcorder). The video camcorder 210 has a main body 36 in which electronic components and the like are built. A display unit 38 is connected to the main body 36 so as to be adjusted to a desired angle. A lens barrel 37 on which an optical system such as an image sensor and a lens is mounted is provided on the upper portion of the main body 36, and a rechargeable battery 39 is mounted on the lower portion of the main body 36.

  FIG. 18 is a cross-sectional view showing a heat dissipation device mounted on the video camcorder 210. The heat dissipation device 140 includes a speaker 70 and a fixing member 64 that can fix the speaker 70 to the outer casing 44 of the main body 36 (see FIGS. 16 and 17). A boss portion 44 b is provided in the outer casing 44, and a flange 64 a of a fixing member 64 abuts on the boss portion 44 b and is fixed by a screw 65. Further, the outer casing 44 is formed with a plurality of openings 44a for outputting the sound of the speaker 70 to the outside.

  The speaker 70 has an annular magnet 51, the first yoke 52 and the second yoke 53 described above. The second yoke 53 is annular. A center pole 52a is erected at the center of the magnet 51 and the second yoke 53, and a coil 62 is wound around the center pole 52a. The center pole 52a has a cylindrical shape, for example. The first yoke 52 is a disc 52b perpendicular to the center pole 52a. The disc 52b is fitted into the opened portion of the fixing member 64.

  The speaker diaphragm 81 is made of an acoustic diaphragm material having an acoustic loss coefficient (tan δ) of 0.02 or more in a frequency band of 20 kHz or more, for example. That is, the diaphragm 81 is configured to be able to vibrate at a frequency outside the human audible frequency range. Examples of the material of the diaphragm 81 include polyethylene terephthalate. The diaphragm 81 is integrally formed with a dome part 81a having a substantially circular arc shape in cross section and an edge part 81b located on the outer peripheral side of the dome part 81a via a connecting part 81c. It is configured.

  An end portion of the cylindrical conductive one-turn ring 83 is fixed to a connecting portion 81c between the dome portion 81a and the edge portion 81b of the diaphragm 81 with, for example, an adhesive. Further, the conductive one-turn ring 83 is disposed in the magnetic gap 84 between the plate 53 and the center pole 52a. The outer peripheral end of the vibration plate 81 is bonded and fixed to the frame 58. If the film is deposited on the surface of the frame with aluminum, copper, or other thermally conductive material by vapor deposition or sputtering, the heat transfer property is improved.

  The magnet 51 is provided with one or more grooves or holes 51a. The hole 51a serves as a flow path through which air flows between a space 77 inside the speaker 70 and a space 78 outside the speaker 70.

  A driver IC 73 is thermally connected to the disc 52b through a heat transfer element 74. The driver IC 73 is mounted on the circuit board 72. The heat transfer element 74 is a metal such as copper or aluminum, a carbon material, or other highly heat conductive sheet. With such a configuration, the heat generated from the driver IC is transmitted to the disk 52 b via the heat transfer element 74 and is transmitted to the space 77 and other members constituting the speaker 70. The disc 52b is preferably made of a magnetic material and a material having high thermal conductivity.

  FIG. 19 is a block diagram showing a drive signal supply source for supplying a drive signal to the coil 62 of the speaker 70. In the drive signal supply source, the driver 73 generates a drive signal based on a control signal from the CPU 79. The driver 73 may be configured by the driver IC 73. The drive signal generated by the driver 73 is supplied to the coil 62 of the speaker 70. When a drive signal is supplied to the coil 62, the conductive one-turn ring 13 vibrates due to electromagnetic induction and the diaphragm 81 vibrates and emits sound. This sound is output to the outside mainly from the opening 44 a of the outer casing 44. The frequency of the sound at this time may be a frequency in the human audible range, but may be a frequency outside the audible range.

  In the present embodiment, the speaker 70 thus mounted on the video camcorder 210 is used as a jet flow generator. In this case, a part of the outer casing 44, the fixing member 64, and the disc 52b constitute a casing of the jet flow generator. When the diaphragm 81 vibrates, air enters and exits through the hole 51a due to a pressure change in the space 77. As a result, the space 78 also undergoes a pressure change, with the result that air with heat flows out from the opening 44a. Further, natural convection occurs through the opening 44a due to a temperature difference between the spaces 77 and 78 and the outside of the outer casing 44, so that air heat in the spaces 77 and 78 is radiated. As a result, the driver IC as a heat source is cooled.

  As described above, in the present embodiment, the heat source is dissipated using the speaker 70, so that a cooling fan motor is not required, and the electronic device can be downsized. In addition, since a cooling fan motor or the like is not required, the cost of the electronic device can be reduced. Moreover, quietness can be improved by driving the diaphragm 81 at a frequency other than the audible range.

  In general, when recording a video camcorder, the speaker is used only when a button is operated (such as a buzzer). Therefore, most of the time during recording can be used for heat dissipation. Also, heat is a problem when recording, not during playback. This is because various devices such as a camera operate during recording. This is also the reason why the speaker can be effectively used for heat dissipation. In particular, in recent years, since HD is being advanced and the amount of heat generation is increasing, this embodiment is effective.

  Further, according to the present embodiment, the concern that the video camcorder 220 becomes hot and the user gets burned at low temperature is solved. Moreover, since the heat dissipation efficiency is good, the thermal influence on various electronic components in the outer casing can be suppressed.

  FIG. 20 is a perspective view showing a video camcorder according to another embodiment of the present invention. FIG. 21 is a perspective view of the video camcorder shown in FIG.

  The video camcorder 220 is slightly different in appearance from the video camcorder 210 shown in FIG. 16, but the video shooting function is the same, and the description of the same function is omitted. In the video camcorder 220, a CCD (Charge Coupled Device) sensor 45 is disposed in a lens barrel 37 of the main body 36, and a microphone device 46 is built in the main body 36. Of course, the CCD sensor and the microphone device 46 are also mounted on the video camcorder 210 shown in FIG. A CMOS (Complementary Metal-Oxide Semiconductor) sensor may be used instead of the CCD sensor. Reference numeral 38 denotes a liquid crystal display, and reference numeral 39 denotes a battery.

  As shown in FIG. 21, a jet flow generator 50 is installed on the side surface of the outer casing 47 of the video camcorder 220. As the jet generator 50, for example, the one having the same structure as the jet generators 10 and 20 as shown in FIGS. 2 and 5 may be used. In order to realize the reduction in thickness, it is desirable to use the jet generator 20 shown in FIG. FIG. 22 is a cross-sectional view of the portion of the video camcorder 220 including the jet generator 20 as seen from above. As for the jet flow generator 20, the diaphragm 3 should just be arrange | positioned as shown with the broken line in the housing | casing 48, for example. The housing 48 is formed with an opening 48a through which air enters and exits.

A circuit board 54 on which an IC 56 is mounted is mounted in the outer casing 47 of the video camcorder 220. The IC 56 is in contact with the heat transfer device 57, and the heat transfer device 57 is in contact with the inner surface of the outer casing 47. The heat transfer device 57 is a heat dissipation spacer configured by including a heat dissipation filler in a base material made of, for example, silicone or acrylic resin. As the heat dissipation filler, alumina (Al ₂ O ₃ ), aluminum nitride (AlN), silicon carbide (SiC), thermally conductive ceramics, or silicon nitride (Si ₃ N ₄ ) is used. If thermally conductive grease or phase change material is inserted between the heat transfer device 57 and the outer casing 47 and / or between the IC 56 and the heat transfer device 57, the IC 56, the heat transfer device 57, The adhesion of each outer casing 47 is improved.

  As a material of the outer casing 47, for example, a form made of a metal such as aluminum, magnesium alloy, stainless steel, or a resin having high thermal conductivity is conceivable. Thereby, heat is efficiently transmitted from the heat transfer device 57 to the outer casing 47, and heat is efficiently released from the outer casing 47 to the outside. The heat transmitted to the outer casing 47 is also transmitted to the air in the casing 48 of the jet flow generator 50. In addition, when the jet flow generator 50 is activated, forced air convection is generated in the casing 48 having the heat, and air including heat is released to the outside through the opening 48a. As a result, the concern that the video camcorder 220 becomes hot and the user gets burned at a low temperature is eliminated. Moreover, since the heat radiation efficiency is good, the thermal influence on the electronic components in the outer casing 47 can be suppressed. Further, in the present embodiment, since the inside of the outer casing 47 has a sealed structure, it is possible to prevent dust, dust, and the like from entering the outer casing 47.

  The material of the outer casing 47 and the casing 48 may be the same or different materials. When both are made of different materials, any two of the metals such as aluminum, magnesium alloy, and stainless steel, or a resin having high thermal conductivity can be selected as the combination of the materials.

  In FIG. 22, a part of the casing of the jet flow generator 50 is constituted by an outer casing 47. Thereby, the thickness in the Y direction in the figure can be reduced, and downsizing can be realized. However, the configuration of the jet flow generator 50 may be configured without using the outer casing 47 without being limited to such a configuration.

  If a magnesium alloy or the like is used for the outer casing 47 or the casing 48, the cost increases. Therefore, it is also possible to use as the outer casing 47 and the casing 48 a high thermal conductive resin containing a filler of high thermal conductive ceramics such as carbon fiber and alumina.

  FIG. 23 is a cross-sectional view showing a part of a video camcorder according to another embodiment of the present invention.

  In this video camcorder 230, a fan 60 having rotating blades 59 is installed in the outer casing 47 instead of the jet flow generator 50. The fan 60 is a centrifugal fan, that is, air is discharged through the opening 48 a in the rotational circumferential direction of the rotary blade 59. As a drive source of the rotary blade 59, a general flat motor can be used, although not shown. Even with such a configuration, forced convection of air can be generated in the casing 48 of the fan 60 to efficiently dissipate heat.

  FIG. 24 is a sectional view showing a part of a video camcorder according to still another embodiment of the present invention.

  In this video camcorder 240, the same jet generator 50 or fan 60 as described above is in contact with the heat transfer device 57. In this case, the casing 48 is made of a high thermal conductivity material as described above. The outer casing 147 of the video camcorder 240 does not necessarily have high thermal conductivity. However, when the casing 48 and the outer casing 147 are integrally formed, the same material may be used for both.

  FIG. 25 is a cross-sectional view showing a part of a video camcorder according to still another embodiment of the present invention.

  In this video camcorder 250, a jet generator 80 is fitted in an outer casing 147. In the jet flow generator 80, a piezoelectric device 85 is attached to the casing 82 as a diaphragm. The piezoelectric device 85 is formed, for example, by bonding an electrode (not shown) to a piezoelectric body, and a pulse voltage or an alternating voltage is applied to the electrode. The piezoelectric device 85 may be a laminated type having a plurality of piezoelectric bodies and electrode plates. For example, the peripheral edge of the piezoelectric device 85 is attached to the inner surface of the housing 82. The planar shape of the piezoelectric device 85 may be any shape such as a circle, an ellipse, a rectangle, or an ellipse. The housing 82 has an opening 82a through which air enters and exits. The casing 82 is in contact with the heat transfer device 57.

  According to such a configuration, heat from the IC 56 is transmitted to the casing 82 via the heat transfer device 57, and the piezoelectric device 85 vibrates, so that forced convection is generated in the air in the casing 82, and the opening Air containing heat is released through 82a. Thereby, it can thermally radiate efficiently.

  The piezoelectric device 85 may be configured to perform a speaker function. Thereby, the speaker and the jet flow generator 80 can be used together, and the video camcorder 250 can be downsized.

  FIG. 26 is a perspective view showing a video camcorder according to still another embodiment of the present invention. 27 is a cross-sectional view showing a part of the video camcorder shown in FIG.

  In this video camcorder 260, the jet flow generator 90 is disposed inside the outer casing 247. As the jet generator 90, for example, one having the same structure as the jet generators 10 and 20 shown in FIGS. 2 and 5 is used. The casing 92 of the jet flow generator 90 is in contact with the heat transfer device 57, and the heat transfer device 57 is in contact with the IC 56. In FIG. 26, the outer casing 247 constitutes a part of the casing of the jet flow generator 90. The materials of the outer casing 247 and the casing 92 in this case are as described above, and may be the same or different materials. Even with such a configuration, heat can be radiated efficiently.

  Of course, the outer casing 247 may not constitute a part of the casing of the jet flow generator 90, and the jet flow generator 10 or 20 may be arranged as it is inside the outer casing 247.

  The present invention is not limited to the embodiment described above, and various modifications are possible.

  The jet generator according to each of the above embodiments has two or more chambers. However, there may be one chamber. That is, the jet generator in that case has a configuration in which the one chamber communicates with the outside of the housing through the opening.

  In FIG. 16, FIG. 20, etc., a video camcorder is taken as an example of the electronic device. However, the present invention is not limited to this, and any electronic device in which a speaker is originally mounted may be used, and a heat dissipation system can be configured using the speaker.

  Next, still another embodiment of the present invention will be described. FIG. 28 is a perspective view showing the appearance of a laptop PC as an example of the electronic apparatus of the present invention, and FIG. 29 is a perspective view of the laptop PC of FIG. 28 viewed from the back side. 30 is a bottom view of the laptop PC of FIG. 28, and FIG. 31 is a schematic cross-sectional view of the rear side of the laptop PC of FIG.

  As shown in these drawings, the laptop PC 300 has a configuration in which a first outer casing 301 and a second outer casing 302 are connected so as to be opened and closed by rotating in the direction of arrow A in the figure. Yes. The first outer casing 301 is mounted with the heat dissipation device 100 shown in FIG. The second outer casing 302 is connected to the first outer casing 301 so as to have a space behind the upper surface 301 a of the first outer casing 301, and has a liquid crystal display 309.

  The inside and outside of the first outer casing 301 communicate with the bottom surface 301b of the first outer casing 301 in the vicinity of the heat radiating device 100, and the outside air is sucked into the vicinity of the jet generator 20 in the first outer casing 301. For opening the second outer casing 302 to the rear side of the liquid crystal display 309 in the state where the second outer casing 302 is opened, which is behind the upper surface 301a of the first outer casing 301. An opening 304 is provided. Note that a space behind the upper surface 301a where the opening 304 is provided protrudes by the thickness of the second outer casing. However, when the laptop PC 300 does not have a space behind the upper surface and the ends of the second outer casing 302 and the first outer casing 301 are connected to each other, the opening 304 is not provided. It may be a configuration.

  Further, the back surface 301c of the first outer casing 301 communicates the inside and outside of the first outer casing 301, and an opening for discharging the synthesized jet generated by the jet flow generator 20 to the outside of the first outer casing 301. 305 is provided.

  As shown in FIG. 31, the gas sucked into the first outer casing 301 through the openings 303 and 304 is sucked by the jet flow generator 20 and becomes a composite jet by driving the jet flow generator 20 as described above. It is discharged from the opening 305. As a result, the heat of the heat source 105 is radiated to the outside of the first outer casing 301.

  As described above, the opening 303 is provided in the bottom surface 301b of the first outer casing 301, the opening 305 is provided in the rear surface 301c, and the opening 304 is provided in the second outer casing 302 as shown in FIGS. By being provided at a position on the back side of the liquid crystal display 309 in the opened state, the gas is sucked and discharged from each opening, that is, when the jet generator is driven, the user faces the liquid crystal display 309. Since the straight running sound from each opening is blocked, the quietness can be improved.

  As shown in FIGS. 29 to 31, leg portions 306 that support the first outer casing 301 are provided at both rear ends of the bottom surface 301 b of the first outer casing 301. The leg portion 306 creates a space between the bottom surface 301 b and the installation surface of the laptop PC 300, so that intake from the opening 303 is promoted. The height of the leg portion 306 is, for example, 5 mm or more, more preferably about 10 mm, but is not limited to this value. Since two leg portions 306 are provided, the first outer casing 301 is supported while being tilted. However, the number of leg portions is not limited to two, and a total of four legs may be provided at the four corners of the bottom surface 301b so that the bottom surface 301b is parallel to the installation surface. .

  Further, a wall portion 307 is provided in the vicinity of the leg portion 306 of the bottom surface 301b so as to protrude from the bottom surface 301b. The wall portion 307 inhibits the gas flow between the opening 305 and the opening 303 as shown by the arrow in FIG. Therefore, the synthetic jet with heat discharged from the opening 305 is drawn back to the opening 303 side, and the gas containing the synthetic jet flows into the first outer casing 301 from the opening 303, so that the heat dissipation efficiency is improved. It can prevent that it falls.

  Note that the leg portion 306 may be eliminated and the wall portion 307 may be used as a leg portion. In this case, as shown in FIG. 32, the wall portion 307 is provided symmetrically at both ends on the rear side of the bottom surface 301b. As a result, the number of parts can be reduced, and the strength of the legs can be increased.

  By the way, since the gas below the bottom surface 301b is warmed by the heat source 105, other heat generating components, or the like, if the air is sucked from the opening 303, the heat dissipation efficiency may be reduced. Therefore, the wall portion 307 shown in FIG. 30 not only obstructs the gas flow between the opening 303 and the opening 305, but also the outer peripheral portion of the first outer casing 301 as shown in FIG. A flow path that guides the gas to the opening 303 may be provided together with the bottom surface 301b. As a result, as shown by the arrows in the figure, the flow of the warmed gas below the bottom surface 301b to the opening 303 side is inhibited, and only the lower temperature gas in the outer peripheral portion of the first outer casing 301 is opened. Since the air is sucked from 303, it is possible to prevent the heat dissipation effect from being reduced as much as possible.

  Further, in this case, as shown in FIG. 34, two wall portions 307 shown in FIG. 33 may be provided symmetrically on the bottom surface 301b so as to serve also as the leg portions as in FIG.

  Furthermore, as shown in the perspective view of FIG. 35 and the side view of FIG. 36, wall portions projecting from the bottom surface 301b along the side surface 301d at both ends of the bottom surface 301b of the first outer casing 301 on the side surface 301d side. 308 may be provided. Thereby, the leakage of the sound from the side surface 301d side (especially the sound generated from the opening 303) when the jet flow generator 20 is driven can be prevented, and the silence can be further improved. Further, the wall portion 308 may also serve as the leg portion 306.

  As described above, according to the present embodiment, the heat dissipation efficiency when the heat dissipation device 100 is mounted on the laptop PC 300 can be improved.

  The heat radiating device mounted on the laptop PC 300 having the configuration shown in FIGS. 28 to 36 is not limited to the heat radiating device 100, and the heat source 205 and the heat transfer device 131 as shown in FIG. A heat dissipation device 120 including a jet flow generator 20 and a heat sink 35 may be mounted, or two heat sources 105 and 205 as shown in FIG. 11 and heat transfer connected to each heat source. You may mount the thermal radiation apparatus 110 comprised from the devices 31 and 131, the jet flow generator 20, and the heat sink 35. FIG.

  FIG. 37 is a perspective view showing an appearance of a laptop PC 300 when the heat dissipation device 120 shown in FIG. 12 is mounted. In this case, the gas sucked into the first outer casing 301 from the openings 303 and 304 is sucked into the jet flow generator 20, and the synthesized jet generated by the jet flow generator 20 passes through the heat sink 35 and through the opening 305. By being discharged out of the first outer casing 301, the heat of the heat source 205 is radiated.

  Further, without using the heat transfer device, the heat radiating device may be configured by only the heat source and the jet flow generator, and the heat radiating device may be mounted on the laptop PC 300. FIG. 38 is a perspective view showing an external appearance of a laptop PC 300 when a heat radiating device 140 including the heat source 105 and the jet flow generator 20 is mounted. In this case, the gas sucked into the first outer casing 301 from the openings 303 and 304 is sucked into the jet generator 20, and the composite jet generated by the jet generator 20 is blown to the heat source 105, and the heat source 105 The heat source 105 is radiated by being discharged out of the first outer casing 301 through the opening 305 together with the gas having the surrounding heat.

  37 and 38 can also improve the heat dissipation efficiency when the heat dissipation devices 120 and 140 are mounted on the laptop PC 300.

  The electronic device on which the heat radiating device is mounted is not limited to the laptop PC 300. For example, a desktop PC, HDD (Hard Disk Drive) / DVD (Digital Versatile Disk) / BD (Blu-ray Disc) recorder It can be installed in all electronic devices such as audio / visual devices such as mobile phones, game devices, car navigation devices, and robot devices.

  Further, the number and arrangement of the openings 303 to 305 can be changed as appropriate depending on the arrangement of the heat dissipation device. FIG. 39 is a perspective view showing an example in which the heat radiating device 140 including the heat generation source 105 and the jet flow generator 20 is mounted on the electronic device 400 having one outer casing 401. 40 is a bottom view of the electronic device 400 of FIG.

  As shown in these drawings, the bottom surface 401b of the outer casing 401 is provided with an opening 403 for sucking outside air into the outer casing 401, and the side surface 401d of the outer casing 401 generates heat from the jet flow generator 20. An opening 405 for discharging the synthetic jet blown to the source 105 to the outside of the outer casing 401 is provided. The bottom surface 401b is provided with the same leg portion 406 as described above.

  FIG. 41 is a bottom view of the electronic device 400 when a wall portion is provided on the bottom surface of the electronic device 400 shown in FIGS. 39 and 40. As shown in the figure, the wall portion 407 is provided so as to inhibit the flow of gas between the opening 403 on the bottom surface 401b and the opening 405 on the side surface 401d, and is not located below the bottom surface 401b but on the outer casing 401. A flow path is formed to guide the gas from the outer periphery to the opening 403 as indicated by the arrow in the figure. Also with the above configuration, the heat dissipation efficiency when the heat dissipation device 140 is mounted on the electronic device 400 can be improved.

  Similarly to the case shown in FIG. 34, as shown in FIG. 42, the wall portion 407 is provided symmetrically at both end portions in the side surface 401d direction of the bottom surface 401b so that the wall portion 407 also serves as the leg portion 406. It doesn't matter if you do.

  FIG. 43 is a cross-sectional view of the electronic device 400 shown in FIGS. 39 and 40 as viewed from the front. As shown in the figure, in the outer casing 401, in addition to the heat dissipation device 140, other components such as the component 500 are mounted. In this case, the component 500 may be mounted in the outer casing 401 so as to form a gas flow as indicated by arrows in the figure between the space around the heat dissipation device 140 and another space. preferable. Thereby, ventilation between the space around the heat dissipation device 140 and another space is promoted, and the gas flow toward the heat dissipation device 140 is activated, so that the heat dissipation efficiency can be increased.

It is a perspective view which shows the jet flow generator which concerns on one embodiment of this invention. It is sectional drawing of the jet generator shown in FIG. It is an expanded sectional view showing an actuator. It is a figure which shows the mode of the magnetic field of the actuator shown in FIG. It is sectional drawing which shows the jet flow generator which concerns on other embodiment of this invention, and shows the form from which an actuator comprises a part of housing | casing. It is the sectional view on the AA line in FIG. It is a perspective view which shows the thermal radiation apparatus which concerns on one Embodiment, and shows the form by which the heat pipe was connected to the housing | casing of a jet flow generator. It is a rear view of a jet generator which shows the state where the heat pipe was connected to the case with solder. It is a perspective view of the jet generator which shows the state where the heat pipe was connected to the case by caulking. It is sectional drawing which shows the jet flow generator shown in FIG. It is a perspective view which shows the heat radiating device with two heat pipes, and they were connected to the housing | casing and the heat sink. It is a perspective view which shows the heat radiating device with one heat pipe connected to the heat sink. It is a top view which shows the heat radiating device with which the double jet generator was used. It is a rear view of the thermal radiation apparatus shown in FIG. It is sectional drawing which shows the jet flow generator by which the metal plate was used for the top plate of a housing | casing. It is a perspective view which shows an example of the electronic device with which the thermal radiation apparatus which concerns on another embodiment is incorporated. It is the perspective view seen from the substantially opposite side of the video camcorder shown in FIG. It is sectional drawing which shows the heat radiating device mounted in the said video camcorder. It is a block diagram which shows the drive signal supply source for supplying a drive signal to the coil of a speaker. It is a perspective view which shows the video camcorder which concerns on other embodiment of this invention. It is the perspective view seen from the substantially opposite side of the video camcorder shown in FIG. It is sectional drawing seen from the upper part of the part containing the jet generator of the video camcorder shown in FIG. It is sectional drawing which shows a part of video camcorder which concerns on other embodiment of this invention, and shows the example in which the fan was mounted. It is sectional drawing which shows a part of video camcorder which concerns on another embodiment of this invention, and shows the example which housings, such as a jet flow generator, contact | connect a heat transfer device directly. It is sectional drawing which shows a part of video camcorder which concerns on another embodiment of this invention, and shows the example in which the diaphragm of a jet generator is a piezoelectric device. It is a perspective view which shows the video camcorder which concerns on another embodiment of this invention, and shows the example in which the jet flow generator was integrated in the outer housing. It is sectional drawing which shows a part of video camcorder shown in FIG. It is a perspective view which shows the external appearance of the laptop type PC which concerns on another embodiment of this invention, and shows the example with which the thermal radiation apparatus 100 was mounted. It is the perspective view which looked at the laptop type PC of FIG. 28 from the back side. FIG. 29 is a bottom view of the laptop PC of FIG. 28. FIG. 29 is a schematic cross-sectional view of the rear side surface of the laptop PC of FIG. 28. It is a bottom view of laptop type PC in the case of using both a leg part and a wall part. FIG. 6 is a bottom view of a laptop PC when a wall portion is configured to form a gas flow path toward an opening 303. It is a bottom view of laptop type PC in case the wall part of FIG. 33 serves as a leg part. FIG. 30 is a perspective view of the back side of the laptop PC when the laptop PC of FIG. 29 has a silent wall. FIG. 36 is a side view of the laptop PC in the case of FIG. 35. It is a perspective view which shows the external appearance of the laptop type PC which concerns on another embodiment of this invention, and shows the example with which the thermal radiation apparatus 120 was mounted. It is a perspective view which shows the external appearance of the laptop type PC which concerns on another embodiment of this invention, and shows the example with which the thermal radiation apparatus 140 which consists of a jet flow generator and a heat-generation source was mounted. It is a perspective view which shows the external appearance of the laptop type PC which concerns on another embodiment of this invention, and shows the example with which the thermal radiation apparatus 140 was mounted. FIG. 40 is a bottom view of the laptop PC of FIG. 39. It is a bottom view in case the laptop type PC of FIG. 39 has a wall part. It is a bottom view of laptop type PC in case the wall part of FIG. 41 serves as a leg part. FIG. 40 is a cross-sectional view showing the inside of the outer casing of the laptop PC of FIG. 39.

Explanation of symbols

1, 21, 41, 48, 43, 202 (251, 351) ... Housing 11a, 11b, 21a, 22a ... Chamber 3, 81 ... Vibrating body (vibrating plate)
DESCRIPTION OF SYMBOLS 5 ... Actuator 8, 18, 52, 53 ... Yoke 10, 20, 40, ... Jet generator 11a, 11b, 21a, 21b, 41a, 41b ... Upper chamber 12a, 12b, 44a, 48a, 92a, 303-305, 403, 405 ... Opening 10, 20, 30, 40, 50, 80, 90 ... Jet generator 31, 57, 74, 131, 141, 241 ... Heat transfer device 33 ... Solder 35 ... Heat sink 43 ... Metal plates 44, 47 147, 247, 401 ... outer casing 60 ... fan 70 ... speaker 56, 73, 105, 205 ... heat generation source 85 ... piezoelectric device 100, 110, 120, 130 ... heat dissipation device 210, 220, 230, 240, 250, 260 ... Video camcorder 300 ... Laptop PC
301 ... first outer casing 301a ... upper surface 301b, 401b ... bottom face 301c ... rear face 301d, 401d ... side face 302 ... second outer casing 306,406 ... legs 307, 308, 407 ... wall part 309 ... liquid crystal display 400 ... Electronics

Claims (40)

A jet generator that has a casing and generates a synthetic jet by discharging gas from the casing as a pulsating flow;
And a heat transfer device that transfers heat of the first heat source to the housing. The heat dissipating device according to claim 1,
The heat transfer device is a first heat transport device that transports heat of a first heat generation source by a phase change of a refrigerant. The heat dissipation device according to claim 2,
The heat dissipation device further comprising a heat sink to which the gas discharged from the jet flow generator is blown. The heat dissipation device according to claim 3,
A heat dissipation device, further comprising a second heat transport device that is thermally connected to the heat sink and transports heat by a phase change of a refrigerant to transmit heat of the second heat source to the heat sink. apparatus. The heat dissipation device according to claim 2,
The first heat transport device is connected to the casing by caulking or soldering. The heat dissipation device according to claim 2,
The housing includes a metal part to which the first heat transport device is thermally connected. The heat dissipation device according to claim 2,
The heat dissipating apparatus according to claim 1, wherein the housing has a recess or a hole at a position where the first heat transport device hits so that the first heat transport device is fitted. The heat dissipating device according to claim 1,
The jet generator is
A vibrating body capable of giving a pressure change to the gas in the housing in order to discharge the gas;
A driving body for driving the vibrating body,
The housing includes an opening capable of discharging the gas when the vibrating body vibrates. The heat dissipating device according to claim 1,
The jet generator is
A first chamber and a second chamber separated by the vibrating body in a vibration direction of the vibrating body in the housing and containing the gas;
A heat dissipating device comprising: a metal plate disposed on at least one side of the first and second chambers and constituting a part of the housing. The heat dissipating device according to claim 9,
The heat dissipation device, wherein the first heat transport device is thermally connected to the metal plate. The heat dissipating device according to claim 9,
The metal plate is disposed on the first chamber side of the first and second chambers;
The heat radiating device according to claim 1, wherein the driving body is an electromagnetic motor having a yoke that constitutes a part of the casing on the second chamber side. The heat dissipating device according to claim 8,
The vibrating body and the driving body constitute a speaker included in an electronic device on which the heat dissipation device is mounted,
The jet flow generator outputs a sound generated from the speaker to the outside of the electronic device through the opening. A jet generator that has a casing and generates a synthetic jet by discharging gas from the casing as a pulsating flow;
A heat sink to which the gas discharged from the housing is sprayed;
And a heat transfer device that transfers heat from the heat source to the heat sink. A heat source,
An outer housing containing the heat source;
A jet generator that has a casing and generates a synthetic jet by discharging gas from the casing as a pulsating flow;
An electronic device comprising: a heat transfer device that transfers heat of the heat source to the housing. 15. The electronic device according to claim 14, wherein
The jet flow generator has a speaker having a vibrating body capable of giving a pressure change to the gas in the casing in order to discharge the gas.
The housing is
A portion constituting a part of the outer casing;
Provided in a portion constituting a part of the outer casing, the gas can be discharged to the outside of the outer casing, and the sound generated from the speaker can be output to the outside of the outer casing An electronic device having an opening. The electronic device according to claim 15,
Electronic equipment further comprising control means for controlling the vibrating body to vibrate at a frequency other than an audible frequency range. The electronic device according to claim 15,
The electronic device is a video shooting device. 15. The electronic device according to claim 14, wherein
2. The electronic apparatus according to claim 1, wherein the jet flow generator includes a piezoelectric device capable of applying a pressure change to the gas in the housing in order to discharge the gas. The electronic device according to claim 18,
The electronic apparatus is a video shooting apparatus having a speaker that outputs sound by vibrating the piezoelectric device. The electronic device according to claim 18,
The electronic device is characterized in that the piezoelectric device constitutes a part of the housing. 15. The electronic device according to claim 14, wherein
The outer casing has an opening on the bottom surface,
The electronic device further includes a leg portion provided so as to protrude from the bottom surface. 15. The electronic device according to claim 14, wherein
The outer casing has a first opening for sucking the gas into the outer casing, and a second opening for discharging the synthetic jet to the outside of the outer casing,
The electronic device
The electronic apparatus further comprising a wall portion provided in the outer casing so as to inhibit the flow of the gas between the first opening and the second opening. The electronic device according to claim 22,
The first opening is provided on a bottom surface of the outer casing;
The electronic apparatus according to claim 1, wherein the wall portion is provided on the bottom surface so as to form a flow path for guiding the gas from the outer peripheral side of the outer casing to the first opening together with the outer casing. The electronic device according to claim 22,
The first opening is provided on a bottom surface of the outer casing;
The electronic apparatus according to claim 1, wherein the wall portion is provided on the bottom surface so as to be a leg portion of the outer casing. 15. The electronic device according to claim 14, wherein
The electronic apparatus includes a first outer casing that includes the heat generation source, the jet flow generator, and the heat transfer device, and a display unit that is connected to the first outer casing so as to be openable and closable. A laptop computer having a second outer casing,
The first outer casing is
The upper surface of the first outer casing and in the vicinity of the rear surface of the first outer casing at a position on the back side of the display unit with the second outer casing open. A first opening for sucking into the first outer casing;
A second opening provided on a bottom surface of the first outer casing, for sucking the gas into the first outer casing;
A third opening provided on the back surface for discharging the synthetic jet out of the first outer casing;
An electronic device comprising: a leg portion provided so as to protrude from the bottom surface. The electronic device according to claim 25,
The electronic apparatus further comprising a wall portion provided on the side surface side of the second opening so as to protrude from the bottom surface along the side surface of the first outer casing. A heat source,
An outer housing containing the heat source;
A jet generator that has a casing and generates a synthetic jet by discharging gas from the casing as a pulsating flow;
A heat sink to which the gas discharged from the housing is sprayed;
An electronic apparatus comprising: a heat transfer device that transfers heat of the heat source to the heat sink. The electronic device according to claim 27,
The outer casing has an opening on the bottom surface,
The electronic device further includes a leg portion provided so as to protrude from the bottom surface. The electronic device according to claim 27,
The outer casing has a first opening for sucking the gas into the outer casing and a second opening for discharging the gas blown to the heat sink to the outside of the outer casing,
The electronic device
The electronic apparatus further comprising a wall portion provided in the outer casing so as to inhibit the flow of the gas between the first opening and the second opening. An electronic device according to claim 29,
The first opening is provided on a bottom surface of the outer casing;
The electronic apparatus according to claim 1, wherein the wall portion is provided on the bottom surface so as to form a flow path for guiding the gas from the outer peripheral side of the outer casing to the first opening together with the outer casing. An electronic device according to claim 29,
The first opening is provided on a bottom surface of the outer casing;
The electronic apparatus according to claim 1, wherein the wall portion is provided on the bottom surface so as to be a leg portion of the outer casing. The electronic device according to claim 27,
The electronic apparatus includes a first outer casing that includes the heat generation source, the jet flow generator, and the heat transfer device, and a display unit that is connected to the first outer casing so as to be openable and closable. A laptop computer having a second outer casing,
The first outer casing is
The upper surface of the first outer casing and in the vicinity of the rear surface of the first outer casing at a position on the back side of the display unit with the second outer casing open. A first opening for sucking into the first outer casing;
A second opening provided on a bottom surface of the first outer casing, for sucking the gas into the first outer casing;
A third opening provided on the back surface for discharging the gas blown to the heat sink out of the first outer casing;
An electronic device comprising: a leg portion provided so as to protrude from the bottom surface. An electronic device according to claim 32, wherein
The electronic apparatus further comprising a wall portion provided on the side surface side of the second opening so as to protrude from the bottom surface along the side surface of the first outer casing. A heat source,
An outer housing containing the heat source;
A fan having a housing and discharging gas from the housing;
An electronic device comprising: a heat transfer device that transfers heat of the heat source to the housing. A heat source,
A jet generator that has a casing and generates a synthetic jet by discharging gas from the casing as a pulsating flow;
An outer housing containing the heat source and the jet flow generator and having a first opening on a bottom surface;
An electronic device comprising: a leg portion provided so as to protrude from the bottom surface. A heat source,
A jet generator that has a casing and generates a synthetic jet by discharging gas from the casing as a pulsating flow;
An outer housing containing the heat generation source and the jet flow generator, and having a first opening for sucking the gas and a second opening for discharging the synthetic jet;
An electronic apparatus comprising: a wall portion provided in the outer casing so as to inhibit the flow of the gas between the first opening and the second opening. The electronic device according to claim 36,
The first opening is provided on a bottom surface of the outer casing;
The electronic apparatus according to claim 1, wherein the wall portion is provided on the bottom surface so as to form a flow path for guiding the gas from the outer peripheral side of the outer casing to the first opening together with the outer casing. The electronic device according to claim 36,
The first opening is provided on a bottom surface of the outer casing;
The electronic apparatus according to claim 1, wherein the wall portion is provided on the bottom surface so as to be a leg portion of the outer casing. 36. The electronic device according to claim 35, wherein
The electronic device
A first outer casing that includes the heat source and the jet flow generator and has the first opening on the bottom surface for sucking the gas, and a display unit. A laptop computer having a second outer casing connected to be openable and closable;
The first outer casing is
The upper surface of the first outer casing and in the vicinity of the rear surface of the first outer casing at a position on the back side of the display unit with the second outer casing open. A second opening for inhaling into the first outer casing;
An electronic device comprising: a third opening provided on the back surface for discharging the synthetic jet to the outside of the first outer casing. 40. The electronic device according to claim 39, wherein
The electronic apparatus further comprising a wall portion provided on the side surface side of the second opening so as to protrude from the bottom surface along the side surface of the first outer casing.

Images