JP2008147049A - Lighting apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lighting apparatus which can reduce glare at a projected part where light with different colors emitted from a plurality of LED elements is transmitted and can suppress color unevenness at an illumination object illuminated. <P>SOLUTION: The lighting apparatus is provided with an apparatus main body 5, a reflecting plate (reflecting member) 11, and an LED light source 15. The apparatus main body 5 has a projection part 5b where light from the LED light source 15 is transmitted. The reflecting plate 11 is formed in cross-sectionally recessed shape. A projection part 5b is arranged between both side fringes 11a of the reflecting plate 11 extending in longitudinal direction of the apparatus main body 5, and the reflecting plate 11 is built in the apparatus main body 5 opposed to the projection part 5b. The LED light source 15 is formed by mounting a light-emitting part 17 on a light source substrate 16 extending in longitudinal direction of the apparatus main body 5. The light-emitting part 17 has a plurality of LED elements with different emission color, and is formed by arranging these elements in a row in the longitudinal direction of the light source substrate 16. This light-emitting part 17 is arranged between the reflecting plate 11 and the projection part 5b opposed to the reflecting plate 11. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a lighting device such as a floor stand that includes an LED light source in which a plurality of LED (light emitting diode) elements of different light emission colors are combined and emits light from the light source.

2. Description of the Related Art Conventionally, there has been known a floor stand having a configuration in which a straight tube fluorescent lamp is vertically arranged on a frame attached to a pedestal, and a cylindrical translucent cover surrounding the lamp is vertically held on the frame. In this floor stand, light emitted from a straight tube fluorescent lamp can be transmitted through a cylindrical translucent cover to illuminate the periphery of the floor stand (see, for example, Patent Document 1).
JP 2000-340006 (paragraphs 0005-0006, FIG. 1)

  A lighting fixture using a fluorescent lamp as a light source such as the floor stand not only needs to be replaced every time the fluorescent lamp has reached the end of its life, but also the light color of the light emitted by the fluorescent lamp is constant.

  For this reason, an attempt has been made to use a semi-permanent LED as a light source instead of a fluorescent lamp. In this case, by combining a plurality of LED elements having different emission colors and mixing the light of these LED elements at a desired ratio for illumination, not only white illumination light is obtained, but also light of other colors. It is possible to obtain In order to obtain white illumination light, it is common to combine red LED elements that emit red light, green LED elements that emit green light, and blue LED elements that emit blue light, and mix these emission colors. It is. Further, the LED element includes a bullet type and a surface mount type, that is, an SMD (Surface Mount Device) type, and the latter is called an LED chip. A bullet-shaped LED element with extremely strong directivity is not suitable as a light source for a floor stand or the like because it is difficult to mix a plurality of emission colors when color rendering is required. Since the LED chip emits light around it, it is considered that the LED chip is highly applicable as a light source such as a floor stand.

  Under these circumstances, the present inventor has developed an LED light source in which SMD red, green, and blue LED chips are arranged in the order described, for example, to form a set of light emitting groups, and a plurality of these groups are arranged in a straight line. . The LED light source was replaced with the straight tube fluorescent lamp, and a floor stand having a configuration in which each LED chip was opposed to the tubular translucent cover was prototyped. I found that there was a problem.

  In this floor stand, the light emitted from each LED chip of the LED light source is directly incident on the translucent cover and passes through the cover for illumination. By the way, although the brightness | luminance and directivity of a LED chip are weak compared with a bullet-shaped LED, a brightness | luminance and directivity are strong compared with a fluorescent lamp.

  For this reason, when the site | part through which the light of an LED light source permeate | transmits is visually recognized in a translucent cover, not only the glare of this transmission site | part is high, but the LED light source image, ie, each LED arranged in a straight line The light emission color of the chip is reflected in the transmitted part. Furthermore, as described above, the light emitted from each LED chip toward the translucent cover travels straight as it is and is diffused according to the distance reaching the object to be illuminated such as the wall surface in the room. For this reason, it has been found that the emission colors of the LED chips cannot be sufficiently mixed before reaching the object to be illuminated, and color unevenness is likely to occur in the object to be illuminated. In particular, it has been found that the light emission color of the LED chip positioned at the end of the LED chip in the light emitting group is conspicuous in the object to be illuminated.

  An object of the present invention is to reduce a glare in a light projecting portion through which light of different colors radiated from a plurality of LED elements is transmitted, and to suppress uneven color in an illuminated object to be illuminated. Is to provide.

  The invention according to claim 1 is an instrument main body having a light projecting portion through which light is transmitted; and has both side edges extending in the longitudinal direction of the instrument main body and is formed in a concave cross section, and the light projecting between the both side edges. A reflection member built in the instrument body opposite to the light projecting part; and a light emitting part provided on a light source substrate extending in the longitudinal direction of the instrument body, and the light emitting part The light emitting unit has a plurality of LED elements having different emission colors and is disposed between the reflecting member and the light projecting unit so as to face the reflecting member, and these LED elements are the light sources. LED light sources arranged in the longitudinal direction of the substrate.

  The invention of claim 1 can be suitably implemented as a floor stand, and can be implemented as various lighting fixtures having lighting fixtures for lighting rails, shelf lamps, and other elongated fixture bodies. In the invention of claim 1, the light projecting portion of the instrument body occupies a part of the instrument body and may be formed integrally with the instrument body or attached to the instrument body. . At the same time, the light projecting unit through which the light emitted from the light emitting unit is transmitted toward the object to be illuminated preferably has high light transmittance and light diffusibility. In order to give such performance, the light projecting portion can be configured to have a sheet-like light control cover adhered to either the light incident surface or the light emitting surface. As the light control cover, a frosted transparent sheet or a milky white sheet having a light transmittance of 50% or more can be used. The high light transmittance of the light projecting unit is effective in securing a large amount of light projected onto an illumination target such as an indoor wall surface. In addition, the fact that the light projecting part has light diffusibility is effective not only in suppressing the image of the light emitting part on the light projecting part but also in suppressing color unevenness in the illumination target. .

  In the invention of claim 1, the reflecting member includes a metallic reflector that directly reflects light incident on the metal ground surface, a reflector obtained by laminating a reflective layer on a metal or synthetic resin surface, and the like. Can be used. Further, in the invention of claim 1, the reflecting member is an elongated one having a length corresponding to the length of the light projecting portion, and the shape of the cross section of the reflecting member may be a concave shape. For example, a bent shape in which the cross-section is substantially U-shaped and the opposite surface is opened in a C shape, a substantially semicircular shape such as a paraboloid, and the like can be given.

  In the invention of claim 1, the LED light source is disposed so that the light emitted from the light emitting portion is irradiated in a direction different from the direction directly toward the light projecting portion, so that the light emitting portion faces the reflecting member. Can be provided. Therefore, when a plurality of LED light sources are arranged between the reflecting member and the light projecting unit, the plurality of LED light sources can be provided at different angles with respect to the reflecting member or the light projecting unit. In the first aspect of the invention, the arrangement of the LED elements in one light emitting group formed by the LED elements of a plurality of colors can be arbitrarily selected.

  The invention of claim 1 preferably includes an LED light source having a light emitting portion in which a red LED chip, a green LED chip, and a blue LED chip, which are long-life LED elements, are arranged. By arbitrarily changing the ratio of the light emission amount of the chip, a desired white or other light color can be obtained and illuminated. In this illumination, the light emitted by the light emitting unit does not directly pass through the light projecting unit, but is projected toward the reflecting member at a position different from the light projecting unit, and is directed toward the light projecting unit by this reflecting member. By being reflected, the object to be illuminated is illuminated through the light projecting unit. Thus, by reflecting each light with a reflective member, light is easy to mix and the uneven color in a to-be-illuminated object is suppressed. Furthermore, the image of the light emitting unit is prevented from being reflected on the light projecting unit, and glare at the light projecting unit can be reduced.

  The invention of claim 2 is characterized in that the instrument body has diffuse translucency, and both side edges of the reflecting member are brought into contact with the inner surface of the instrument body.

  In the invention of claim 2, the instrument body may be such that the forming material itself has a diffuse translucency, or a process for imparting a diffuse translucency to the transparent material, for example, a frosting process. Light diffusibility may be obtained by providing a light diffusion surface.

  In the invention of claim 2, since the instrument body has diffuse translucency, a part of the light reflected by the illuminated object such as an indoor wall surface is transmitted through the instrument body, This instrument body can be illuminated. Furthermore, since the light of the LED light source is prevented from leaking between the side edge of the reflecting member and the inner surface of the instrument body, the image of the LED elements that are emitting light is arranged in a straight line. It is possible to suppress reflection on both sides of the light projecting unit.

  The invention of claim 3 has a light emitting group in which the LED elements of the plurality of colors are arranged, and a white LED element arranged in the direction in which the LED elements of the respective colors are arranged and on both sides of the light emitting group. It is a feature.

  According to the third aspect of the present invention, the white light of the white LED adjacent to the LED element in the arrangement direction is set to the emission color of the LED element located at the end of the arrangement direction of the plurality of color LED elements forming the light emission group. Therefore, it is possible to suppress the emission color of the LED elements positioned at the end in the arrangement direction from being noticeable.

  According to the lighting fixture of the first aspect of the invention, the glare in the light projecting portion through which the light emitted from the plurality of LED elements having different emission colors can be reduced, and color unevenness in the illumination target to be illuminated can be reduced. Can be suppressed.

  According to the lighting fixture of the second aspect of the invention, the fixture body can be illuminated, and the images of the light emitting LED elements can be suppressed from appearing on both sides of the light projecting portion of the fixture body.

  According to the lighting fixture of the third aspect of the present invention, it is possible to suppress the emission color of the LED elements positioned at the end in the arrangement direction of the LED elements of the plurality of colors forming the light emitting group from being noticeable, and the color unevenness in the illumination target. Suppression can be further promoted.

  A first embodiment of the present invention will be described with reference to FIGS.

  Reference numeral 1 in FIGS. 1 and 2 denotes a lighting fixture, for example, a floor stand. The floor stand 1 includes a pedestal 2, an instrument body 5, a reflecting member such as a reflecting plate 11, an LED light source 15, and a lighting device (not shown).

  The base 2 is circular, for example. The instrument body 5 has an elongated cylindrical shape, and a lower end portion of the instrument body 5 is connected to the pedestal 2 and stands on the pedestal 2. In this case, as shown in FIG. 2, the instrument body 5 is arranged with its center shifted from the center of the base 2.

  The instrument body 5 is formed by attaching a top plate 7 that closes the upper end opening of the cylindrical body 6 to a cylindrical cylindrical body 6 whose upper and lower ends are open. The cylindrical body 6 is made of a translucent material such as glass, and its outer surface is roughened by a frosting process that creates minute irregularities on this surface. That is, the entire cylindrical body 6 is made of so-called frosted glass and has a diffuse translucency.

  For example, a paint of the same color as the base 2 is applied to the outer surface of the lower part 5 a of the instrument body 5. The paint prevents light from diffusing and transmitting in the lower part 5a of the instrument body 5. The instrument body 5 has a light projecting portion 5b at the top thereof. The light projecting portion 5b occupies a part of the circumferential direction of the instrument body 5 and is provided to extend in the longitudinal direction of the instrument body 5 (vertical direction in the present embodiment).

  The light projecting unit 5b defines the illumination direction of the floor stand 1 together with the reflector 11 described in detail later. In the case of this embodiment, in order to give the light projecting part 5b further light diffusibility while reducing the brightness of the irradiated light, a translucent light control cover 5c that forms a sheet is attached to the surface of the light projecting part 5b. It has been. The light control cover 5c is made of a milky white sheet having a light transmittance of 50% or more, a light diffusing sheet, or the like.

  Reference numeral 8 in the drawing indicates a pillar disposed in the instrument body 5. The column 8 extends over the top plate 7 and the pedestal 2, and is shifted from the center of the instrument body 5 so as to approach the light projecting portion 5b as shown in FIGS.

  The reflector 11 has a length substantially the same as the length of the light projecting portion 5b in the vertical direction, and the cross-sectional shape in the direction orthogonal to the longitudinal direction is a concave shape as shown in FIGS. It has a shape. The reflector 11 is built in the instrument body 5 so as to face the light projecting portion 5b. This reflector 11 is fixed to the upper part of the column 8.

  Two side edges 11 a orthogonal to the longitudinal direction of the reflecting plate 11 are preferably in close contact with the inner surface of the instrument body 5. In addition, when comprising the floor stand used as the instrument main body 5 of the structure other than the light projection part 5b which does not have diffuse permeability, you may make the side edge 11a of the reflecting plate 11 adjoin to the inner surface of the instrument main body 5. FIG. The light projecting portion 5 b is positioned between the side edges 11 a of the reflecting plate 11. A cylindrical light source arrangement space S is formed between the reflector 11 and the light projecting portion 5 b of the instrument body 5. The light source arrangement space S extends in the longitudinal direction of the instrument main body 5, and both upper and lower ends thereof are open.

  As shown in FIGS. 1 to 4, the LED light source 15 is formed by attaching at least one, for example, a plurality of light-emitting portions 17 on one elongated light source substrate 16. The LED light source 15 is arranged extending in the longitudinal direction of the instrument body 5 in the light source arrangement space S with the light emitting portion 17 facing the reflecting plate 11 and the light source substrate 16 facing the light projecting portion 5b. The LED light source 15 is fixed to the reflecting plate 11 by fixing means (not shown).

  As shown in FIG. 4 and the like, the light emitting unit 17 is formed by mounting a plurality of color LED elements, for example, SMD type LED (light emitting diode) chips on the light emitting unit substrate 18. The LED chip includes a red LED chip 19 that is a red LED element that emits red light, a green LED chip 20 that is a green LED element that emits green light, and a blue LED that is a blue LED element that emits blue light. A chip 21 is used. The red LED chip 19, the green LED chip 20, and the blue LED 21 arranged in a predetermined array, for example, in the longitudinal direction of the light emitting unit substrate 18 in the following description order form one light emitting group G, as shown in FIG. In this example, seven light emitting groups G are mounted on one light emitting unit substrate 18 so as to be repeatedly arranged in the longitudinal direction. The LED chips facing the reflector 11 are electrically connected in series and are energized through a pair of power supply terminals 25 and 26 provided at both ends in the longitudinal direction of the light emitting unit substrate 18. Terminals of electric wires connected to a lighting device (not shown) are connected to the power supply terminals 25 and 26.

  The lighting device is built in the lower part of the pedestal 2 or the instrument main body 5 or separately from the floor stand 1. This lighting device can light each LED chip in a desired lighting mode instructed by a remote controller (not shown).

  The floor stand 1 having the above-described configuration is used with its light projecting portion 5b facing an indoor wall surface. Since the floor stand 1 includes the LED light source 15 having the light emitting portion 17 that is formed by repeatedly arranging the red LED chip 19, the green LED chip 20, and the blue LED chip 21, the LED light source 15 is turned on. By irradiating the wall surface, that is, the object to be illuminated, the room can be indirectly illuminated. In the standard use state in this illumination, the light emission amounts of the red LED chip 19, the green LED chip 20, and the blue LED chip 21 are in a predetermined ratio. Therefore, white light is obtained by mixing these three colors and illuminated. it can. In addition, the user can adjust the lighting device and arbitrarily change the ratio of the light emission amount of each LED chip, so that it is possible to obtain another light color according to preference and perform illumination.

  In the above illumination, the light emitted from the LED chips 19 to 21 of the light emitting unit 17 does not directly pass through the light projecting unit 5b toward the light projecting unit 5b. Lighted. In this case, most of the light emitted from the light emitting unit 17 is projected to the opposite side of the light projecting unit 5b with the LED light source 15 as a boundary. In addition, the SMD type LED chips 19 to 21 project light on the side thereof, that is, in the width direction of the LED light source 15 (left and right direction in FIG. 3). The light to the side is not directly directed to the light projecting unit 5b, but is first projected toward the reflecting plate 11, and thus the light incident on the reflecting plate 11 varies according to the incident angle. Is reflected in the appropriate direction and passes through the light projecting portion 5b.

  In this way, the light emitted from each of the LED chips 19 to 21 is reflected in various directions by the reflecting plate 11 so as to be transmitted through the light projecting unit 5b and illuminate the wall surface to be illuminated. The light of each LED chip 19-21 can be easily mixed. For this reason, it is possible to suppress uneven color on the wall surface of the room that is the object to be illuminated.

  In addition, in the present embodiment, the light projecting unit 5b and the light control cover 5c covering the light projecting unit 5b diffuse the light of each color passing therethrough. Color unevenness can be suppressed. In this case, the reflecting plate 11 and the LED light source 15 are moved closer to the light projecting unit 5b than the center of the fixture body 5 to shorten the optical path length until reaching the indoor wall surface to be illuminated, and the light is attenuated. Since it is difficult, the reduction in the amount of light by the light control cover 5c or the like can be mitigated.

  Further, as described above, the light emitted from the LED chips 19 to 21 is not directly transmitted to the light projecting unit 5b, and the presence of the light source substrate 16 causes an image of the light emitting unit 17, specifically, each LED chip 19 to It is suppressed that the light line in which R (red), G (green), and B (blue) according to 21 are repeatedly arranged in a straight line is reflected in the light projecting unit 5b. For this reason, also when the light projection part 5b is visually recognized, the glare in the light projection part 5b can be reduced. A part of the light radiated to the opposite side with respect to the light projecting part 5b and reflected by the central part in the width direction of the reflecting plate 11 is shielded by the light source substrate 16 of the LED light source 15, and the shadow is projected. It is reflected in the central part in the width direction of the optical part 5b. However, since a part of the light reflected on both sides in the width direction of the reflecting plate 11 is inserted into the center portion in the width direction of the light projecting portion 5b, the shadow can be made thin so as not to be noticeable.

  In addition, the light emitted from the LED chips 19 to 21 is reflected by the reflecting plate 11 having a semicircular cross section, for example, and transmitted to the light projecting unit 5b, whereby light having high directivity is emitted from the LED chips 19 to 21. In spite of being emitted, not only the portion facing the front of the light projecting unit 5b through the light projecting unit 5b is irradiated, but also the angle of the light that irradiates the wall surface of the room to be illuminated. Since it becomes wider, it can be illuminated over a wide area including its surroundings.

  Further, since the instrument body 5 has diffuse translucency, as described above, for example, a part of the light that is illuminated on the wall surface of the room and reflected by the object to be illuminated is transmitted to the instrument body 5. Thus, the instrument body 5 can be softly shone. In addition, in this case, a part of the light reflected by the reflecting plate 11 and passing through the light projecting unit 5b is guided to the entire instrument body 5 integrally having the diffuse translucent light projecting unit 5b. Also in this respect, the instrument body 5 can be softly shone. Therefore, when the indoor wall surface illuminated with this including the floor stand 1 is visually recognized, the upper part of the floor stand 1 is visually recognized as black so that an unnatural feeling is not given.

  Furthermore, since both side edges 11a of the reflector 11 are brought into contact with the inner surface of the instrument body 5, light from the LED light source 15 can be prevented from leaking between the side edges 11a of the reflector 11 and the inner surface of the instrument body 5. For this reason, the image of each LED chip 19-21 which the light emission part 17 is light-emitting, specifically R (red), G (green), and B (blue) by each LED chip 19-21 repeat, and it is linear. It is possible to suppress the lines of light lined up on both sides of the light projecting portion 5b in the width direction.

  FIG. 5 shows a second embodiment of the present invention. Since the second embodiment is the same as the first embodiment except for the items described below, the same components are denoted by the same reference numerals as those of the first embodiment and description thereof is omitted.

  The second embodiment is different from the first embodiment in that a white LED element that emits white light, for example, an SMD type white LED 22 is added to the LED light source 15. The white LED 22 includes, for example, an LED chip and a phosphor mixed in a light-transmitting sealing material that seals the LED chip. When the white LED 22 is a blue LED chip, a phosphor that absorbs blue light and emits yellow light is combined. Similarly, in the case of the white LED 22 and the LED chip to be used is an ultraviolet LED chip that emits ultraviolet light, three types of phosphors that absorb ultraviolet light and emit red, yellow, and blue light are combined.

  The white LEDs 22 are arranged adjacent to both ends of the light emitting group G formed by the red LED chip 19, the green LED chip 20, and the blue LED chip 21, respectively. In FIG. 5, for ease of identification of each LED chip, the red LED chip 19, the green LED chip 20, and the blue LED chip 21 are illustrated in black, and the white LED 22 is illustrated in white for convenience.

  Except for the matters described above, the second embodiment is the same as the first embodiment including the portions not shown in FIG. Therefore, the floor stand 1 of the second embodiment also obtains the same operation as that of the first embodiment, can reduce glare in the light projecting part through which the light emitted from each LED chip is transmitted, and is illuminated. Color unevenness in the illumination target can be suppressed.

  Moreover, by providing the white LED 22 as described above, the white light of the white LED 22 can be mixed with the red light of the red LED chip 19 or the blue light of the blue LED chip 21 closest to the white LED 22. For this reason, among the LED chips 19 to 21 of RGB forming one light emitting group G19, the light of the LED chips located at the end in the arrangement direction becomes inconspicuous. Can further suppress uneven color.

FIG. 2A is a side view showing a part of the floor stand according to the first embodiment of the present invention. FIG. 2B is a front view showing a part of the floor stand of the first embodiment. The top view which shows the floor stand of 1st Embodiment partially, and shows it. The expanded sectional view shown along F3-F3 line in FIG. 1 (A). The front view which shows the LED light source with which the floor stand of 1st Embodiment is provided. The rear view which partially shows the upper part of the floor stand of 2nd Embodiment of this invention, and shows it.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Floor stand (lighting fixture), 5 ... Appliance main body, 5b ... Light-projecting part of instrument main body, 5c ... Light control cover, 6 ... Cylindrical body of instrument main body, 11 ... Reflector (reflective member), 11a ... Reflection Side edge of plate (reflecting member), S ... light source arrangement space, 15 ... LED light source, 16 ... light source substrate, 17 ... light emitting portion, 18 ... light emitting portion substrate, 19 ... red LED chip (red LED element), 20 ... green LED chip (green LED element), 21 ... blue LED chip (blue LED element), 22 ... white LED (white ED element)

Claims (3)

An instrument body having a light projecting portion through which light passes;
A reflection body which has both side edges extending in the longitudinal direction of the instrument body and is formed in a concave shape in cross section, and which has the light projecting portion disposed between the both side edges and which is built in the instrument body facing the light projecting portion. With members;
The light emitting unit is formed on a light source substrate extending in the longitudinal direction of the instrument body, and the light emitting unit is disposed between the reflecting member and the light projecting unit with the light emitting unit facing the reflecting member, and An LED light source in which the light emitting section has a plurality of LED elements having different emission colors, and these LED elements are arranged in the longitudinal direction of the light source substrate;
The lighting fixture characterized by comprising.   The lighting fixture according to claim 1, wherein the fixture main body has diffuse translucency, and both side edges of the reflecting member are brought into contact with an inner surface of the fixture main body.   The light emitting group in which a plurality of the LED elements having different light emission colors are arranged, and the white LED elements arranged in the arrangement direction of the LED elements and on both sides of the light emitting group, respectively. The lighting fixture of 1 or 2.

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