JPS6247727A - Position detector - Google Patents

Abstract

PURPOSE:To improve both operability and detecting accuracy by forming a position detecting part with the magnetic matters and two transparent conductor plates of coils orthogonal to the magnetic matters. CONSTITUTION:A position detector consists of a position detecting part 10, an input pen 20, a drive signal source 30, a signal selecting circuit 40 and a position detecting circuit 50. The part 10 contains plural thin wire type magnetic matters 11 set in parallel with each other and coils 13 formed with two conduction plates 12 containing thin wire type conductors 122 formed in parallel on a transparent substrate 121. These matters 11 and conductors 122 are set orthogonal to each other. A bridge circuit is formed by combining two of the coils 13 and a prescribed impedance element. These coils are switched successively for extraction of voltage out of a part between detecting terminals. Thus a position designated by the pen 20 on the part 10 can be obtained from said extracted voltage.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention provides a position specifying magnetic field that is specified by a position specifying magnetic generator based on a change in magnetic permeability of a magnetic body to which a magnetic field is applied by the position specifying magnetic generator. The present invention relates to a position detection device for detecting a position.

(Prior Art) A conventional position detection device C is a point at which a pulse current is applied to a drive coil provided at one end of a magnetostrictive transmission medium or at the tip of a position indicating pen to generate magnetostrictive vibration waves in the magnetostrictive transmission medium. Then, the time required to detect the induced voltage based on the magnetostrictive oscillation waves in the detection coil provided at the tip of the positioning pen or one end of the magnetostrictive transmission medium is measured using a processor, etc., and from this, the indicated position of the positioning pen is determined. There was something I did as if I had calculated it. In addition, as another conventional position detection device, a plurality of drive lines and detection lines are arranged perpendicularly to each other, and current is sequentially applied to the drive lines and detection lines are sequentially selected to detect induced voltage. There is a device in which a position specified by a position indicating pen made of a magnetic material such as ferrite is detected from the position of a detection line where a large induced voltage is induced.

(Problem to be solved by the invention) The former device has relatively good position detection accuracy, but since timing signals etc. are exchanged between the pen and the processor, there is a problem between the pen and the device. It requires a cord, which severely limits its handling, and it is susceptible to induction from other pens, causing malfunctions, or conversely, may become a source of noise. It had to be held vertically and pointed fairly close together.

In addition, in the latter device, the positioning pen can be called cordless, but the resolution of the coordinate position is determined by the spacing between the lines, and if the spacing between the lines is made small in order to increase the resolution, the S/N ratio and stability will deteriorate. It is difficult to increase the resolution, it is difficult to detect the position directly above the intersection of the drive line and the detection line, and the position indicator pen must be placed extremely close to the line, which makes it difficult to detect the position directly above the intersection of the drive line and the detection line. I couldn't put things down and use it. Furthermore, conventionally, when attempting to associate the timing of position input with the operation of a pen, it was necessary to attach a switch or some kind of signal generation circuit to the pen itself, making the configuration complex and prone to failure. Furthermore, since the drive coil or drive line needs to flow a certain amount of current,
Generally, it is not possible to construct a transparent conductor with a high resistance value and a small allowable current value, and there is a problem that a transparent position detection section cannot be constructed.

The present invention improves these conventional drawbacks, and
The magnetic generator for position designation is not connected anywhere, making it easy to operate, resistant to external guidance, and does not emit noise. Furthermore, it provides highly accurate position detection with a transparent position detection part. The purpose is to

(Means for Solving the Problems) As shown in FIG. Or a thin wire conductor 122
two conductor plates 12a and 12b formed substantially parallel to each other at a predetermined interval, the two conductor plates 12
a, 12b on both sides of the plurality of magnetic bodies 11.
1 and a conductor 122 are stacked so as to be perpendicular to each other, and the conductors 122 on the two conductor plates 12a and 12b are vertically connected to form a plurality of coils 13a to 13j;
A position specifying magnetic generator that generates a steady magnetic field, such as the input pen 20, a drive signal source 30 that generates an alternating signal with a predetermined period, two of the coils 13a to 13j, and a predetermined impedance element. A voltage generated between a signal selection circuit 40 in which a bridge circuit is configured using the combination and the alternating signal as a power source, and the plurality of coils 13a to 13j are sequentially switched and connected as coils of the bridge circuit, and a detection terminal of the bridge circuit. The position detecting circuit 50 sequentially extracts the signals and determines the designated position on the position detecting section 10 by the input valve 20 from these.

(Function) The self-inductance L of each of the coils 138 to 13j is expressed as follows: L=μ·SN2/I (1
) (where, S is each coil 13a to 13j
, N is the number of turns of each coil 13a to 13j, and f is the length of each coil 138 to 13j. ).

By the way, the magnetic permeability μ of the magnetic body 11 changes greatly depending on a steady magnetic field (hereinafter referred to as magnetic bias) applied from the outside. The state of the change varies depending on the composition of the magnetic material, the frequency of the AC signal, or whether the magnetic material is subjected to heat treatment or magnetic field treatment, but here, as shown in Figure 2, when a slight magnetic bias is applied, It is assumed that it is the maximum, and the more magnetic bias is applied, the more it decreases. Note that the direction in which the magnetic bias is applied is the longitudinal direction of the magnetic body 11, and hereinafter this will be referred to as the X direction.

When one end of the input ben 20 containing the bar magnet 21 is positioned above the magnetic body 11, the magnetic flux emitted from the bar magnet 21 crosses the magnetic body 11 as shown in FIG. At this time, the magnetic flux is almost orthogonal to the magnetic body 11 directly below the bar magnet 21,
Further, on both sides thereof, it gradually becomes along the magnetic body 11.

The amount of magnetic bias applied in the longitudinal direction of the magnetic body 11 increases as the angle at which the magnetic flux intersects with the magnetic body 11 becomes smaller. Therefore, it is smallest immediately below the bar magnet 21 of the input ben 20, and gradually increases as the distance from this point increases. It gets bigger and gets smaller as you move further away.

At this time, the relationship between the position (displacement) X in the X direction on the magnetic body 11 (however, the position directly below the bar magnet 21 is set to 0) and the magnetic bias ff1Hx is expressed as +((h+d)
+
The distance between one end of and the magnetic body 11, d is the length of the bar magnet 21,
μ0 is the magnetic permeability of vacuum. ). This situation is shown in Figure 4.

From FIGS. 2 and 4, the relationship between the magnetic permeability μ of the magnetic body 11 and the position X in the X direction at this time is as shown in FIG.

On the other hand, the signal selection circuit 40 selects two of the coils 138 to 13j (hereinafter referred to as one coil).
．． 2 to 2. ) and predetermined impedance elements, such as resistors R1 and R2, are combined to form a bridge circuit as shown in FIG. At this time, coil K1. to 2
For example, (K1. to 2) = (13a, 13c), (
13b.

13e), (13d, 13Q), (13f, 131),
(13h, 13j) sequentially, 1. 2 and the bar magnet 21, the self-inductance is proportional to the magnetic permeability μ as shown in equation (1) above. 2 self-inductance L1.
L2 also changes as shown in FIG. Coils 13a-1
If the spacing between each coil of 3j is a, then the switching spacing is 2a, and the spacing between the pair of coils is 3a (however, the spacing when only both ends are switched is a1, and the spacing between the coils is 2a).

The conditions for the bridge circuit shown in FIG. 6 to be balanced are Ll・R2−L2・R1 (3),
If R1-R2, the detection terminals 1-2 of the bridge circuit
There are approximately two coils in between. A voltage proportional to the difference between the two self-inductances Ll and L2 is obtained. Therefore, as mentioned above, 1. If you switch 2 to
As shown in FIG. 8, a voltage value is obtained by sampling a signal corresponding to the difference between the signals of a pair of coils at an interval 3a at an interval 2a. Here, at the point P where the voltage value is "0", the self-inductances LT and L2 are equal, that is, the two coils from the bar magnet 21 have 1. This shows the case where the distances from 2 to 2 are exactly equal, and from this the position of the bar magnet 21 can be detected.

Also, in this case, 1. Each conductor 1 making up 2
Although the resistance value of 22 is large and the allowable current value is small, 1. There is no problem because there is no need to pass a large current through 2. Therefore, by taking advantage of the fact that the position detection section 10 is transparent, it is possible to use it by placing it on a display panel such as a liquid crystal display, or to add illumination from the bottom when inputting a negative film or the like.

The curve shown in FIG. 8 approximates several voltage values when the coils 13a to 13j are switched as described above, and in reality such continuous values cannot be obtained. However, the upper limit of the frequency component of this approximate signal is approximately proportional to 6a, and the sampling frequency is 2 as described above.
Since it is proportional to a, the approximate signal can be reproduced from the voltage value according to the well-known sampling theorem.

In the present invention, the aforementioned discrete voltage value signal is detected and converted into a DC voltage detection signal, which is roughly passed through a predetermined low-pass filter to form a continuous signal as shown in FIG. is detected, and the position of the bar magnet 21 is detected.

The first method of detecting point P is to level shift the detection signal shown in FIG. 8 by a predetermined value Vt, then finely sample it and convert it into analog/digital data, which corresponds to the level shift value as shown in FIG. 9. By finding the ratio (b:c) at the coil switching timing of the point P- that crosses the level Vt,
At the same time, from the inclination at point P, the height direction (hereinafter referred to as Z) of the bar magnet 21, that is, the input ben 20 can be calculated.
It is called direction. ) can be calculated.

In addition, as a second detection method for point P, the count value of a counter that counts predetermined clock pulses is decoded to generate a switching timing signal for the signal selection circuit 40, and the detection signal shown in FIG. It is also possible to detect the timing of the point P with a predetermined comparator and calculate the position of the point P in the X direction from the count value of the counter at this time.

(Example) FIG. 10 is an exploded perspective view showing a specific configuration of the position detection section 10. In the figure, 110 is a magnetic plate, 12a
, 12b are conductor plates, the conductor plate 12a, the magnetic plate 11
0. The conductor plates 12b are stacked in this order.

As shown in FIG. 11, the magnetic plate 110 has a plurality of (eight in the illustrated example) thin wire-shaped magnetic bodies 11 arranged substantially in parallel.
This is sandwiched between two transparent and flexible insulating substrates, such as polycarbonate films 111 and 112, and integrated by heat compression bonding or the like. Here, as the magnetic body 11, a material that is difficult to be magnetized even when a magnet is brought close to it, that is, has a small coercive force and has high magnetic permeability, such as an amorphous wire having a circular cross section and a diameter of about 0.11 IIR, is used. As an amorphous wire, for example, (Fe1-xCOx)75Si1oB15 (atomic %)
(X indicates the ratio of Fe and CO, and takes a value of 0 to 1.) etc. are suitable.

As shown in FIG. 12, the conductor plates 12a and 12b are made of a plurality of layers made of indium oxide (■n03), tin oxide (SnO2), etc. on the surface of a transparent substrate 121 having flexibility and insulation properties such as a polycarbonate film. (10 pieces in the illustrated example)
The transparent conductor 122 is formed by depositing band-shaped transparent conductors 122 approximately parallel to each other at predetermined intervals and having a width of about 0.5 to 1 bit.

The respective substrates are bonded and fixed using an adhesive sheet. At this time, the magnetic body 11 of the magnetic plate 110 is arranged along the X direction, and the conductors of the conductor plates 12a and 12b are arranged in a direction perpendicular to the X direction. Each conductor 1 of conductor plates 12a and 12b
22, conductors that overlap vertically are connected at one end by another lead wire or the like, and the magnetic material 11 in the magnetic material plate 110
Coils 13a to 13j are formed around the coils 13a to 13j. Both ends of each coil 13a to 13j are connected to a signal selection circuit 40, respectively. Note that the terminals are drawn out from the conductor 122 by thick film printing of Au (gold) carbon paste.

The thickness of the entire position detection section 10 is actually about 2 to 3 layers, but only the thickness direction is shown enlarged in FIGS. 10 to 12.

FIG. 13 shows another example of a conductor plate, in which a plurality of (10 in the illustrated example) thin metal wires 124 are arranged at predetermined intervals on the surface of a transparent substrate 123 having flexibility and insulation. An example of this is Shinera Polytic Film (manufactured by Shin-Etsu Polymer Co., Ltd.), which is embedded and fixed so that its portion slightly protrudes from the surface of the substrate. In this polytic film, a polycarbonate film with a thickness of about 200 μm is used as the substrate, and stainless steel wires with a thickness of about 22 μm are used as the thin metal wires, with a pitch of 0.3 to 2JIII and protruding by 2 to 5 μm from the film surface. ing.

According to this conductor plate, since the conductor is a thin metal wire that is homogeneous and has a constant thickness, a stable resistance value can be obtained, and the manufacturing and adjustment work of the position detection unit 10 is easy. Therefore, the position detection accuracy can be improved. Note that in the drawing, the thin metal wire is drawn thicker than the actual one, and the light transmittance of the entire conductor plate reaches 86 to 90%.

According to this position detection unit 10, not only can it be used by placing it on a display panel such as a liquid crystal display or a lighting device, but also because each conductor plate 12a, 12b and magnetic plate 110 have flexibility. It can also be used by placing it on a curved surface, and the amorphous wire in the magnetic plate 110 or the gold Ji
By arranging iEIIm at well-defined intervals, it can also be used as a scale.

FIG. 14 is a sectional view showing a specific example of the input vent 20;
The figure is its electrical circuit diagram. In the figure, 22 is a pen-shaped container made of synthetic resin or the like, and the above-mentioned bar magnet 21 is housed in one end of the pen-shaped container so as to be slidable in the axial direction.

In addition, an infrared transmitting window 23 made of transparent plastic or the like is provided along the circumferential direction on the other end side of the container 22, and inside the window 23 is a reflector 24 having a conical circumferential surface coated with chrome plating or the like. An infrared light emitting diode 25 is housed therein. 26a and 26b are operation switches, and the operation switch 26
a is attached to one side of the tip side of the container 22, and an operation switch 26b is attached opposite to the other end of the bar magnet 21. Further, 27 is a signal generation circuit, 28 is a battery, and the container 2
It is stored in the appropriate place within 2. The signal generation circuit 27 performs a plurality of (
It converts each of three commands into a plurality of code signals by combining several pulse signals, and includes a decoder 27a, a code signal generator 27b, and a diode driving transistor 27c, and an operation switch 26a.
, 26b, a code signal is generated to drive the light emitting diode 25. When the operation switch 26a is turned on, an infrared signal indicating a measurement start code is transmitted from the diode 25 to the reflector 24 and the transmission window 2.
3, and when the tip of the bar magnet 21 with the cover 29 attached is pressed against the input surface, the bar magnet 2
1 slides, the switch 26b is turned on, and an infrared signal is emitted without a position input code signal.

FIG. 16 shows a specific example of the drive signal source 30. In the figure, 31 is an integrating circuit, 32 is a band pass filter, and 33 is a power driver. Integrating circuit 31 has its input terminal 3
4. Receives a clock pulse (or a pulse obtained by dividing the clock pulse) from the arithmetic processing circuit of the position detection circuit 50, which will be described later in 4.
This is integrated and converted into a triangular wave signal. The bandpass filter 32 converts the triangular wave signal into a sine wave signal. The power driver 33 consists of an operational amplifier and a current amplifier, and converts the sine wave signal into lt! A stream is amplified and sent to the signal selection circuit 40 from its output terminal 35. In addition,
The reason why a clock pulse is used as the reference (input) signal is to synchronize with the position detection circuit 50.

FIG. 17 shows a specific example of the signal selection circuit 40, in which 41 and 42 are multiplexers, 43 is an amplifier, and R is a resistor. The multiplexers 41 and 42 are well-known devices having one common terminal and a plurality of selection terminals (five in the illustrated example), and each selects the selection terminal with the same number according to the switching signal from the position detection circuit 50. , coil 13
a to 13j are switched and connected in order to form the bridge circuit shown in FIG. 6(a). multiplexer 41.4
The common terminal of the two, that is, the detection terminal of the bridge circuit is connected to the amplifier 4.
3 to the position detection circuit 50.

FIG. 18 is a circuit block diagram showing a specific configuration of the position detection circuit 50, and FIG. 19 is a diagram showing signals of each part. When an infrared signal indicating a measurement start code is emitted from the light emitting diode 25 of the input vent 20 mentioned above, the infrared signal is received by the infrared receiving diode 51, and further amplified and waveform-shaped by the receiver 52, and the original It is converted into a code signal and then returned to a command signal to start measurement.
PLJ) 53. When the arithmetic processing circuit 53 reads the command signal and recognizes the start of measurement, the decoder 5
4 to the signal selection circuit 40, and on the other hand, sends the clock pulse to the drive signal source 3o via the frequency divider 55, which drives the drive signal to the coil 1.
38 to 13j.

At this time, the output voltage of each bridge circuit constituted by the coils 13a to 13j is sent to the detector 56 via the multiplexer 41, 42 and the amplifier 43, rectified and converted into a DC voltage detection signal S2, and further It is sent to a low-pass filter 57 and converted into a detection signal S3. The detection signal S3 is level-shifted by the level shifter 58 to become a positive voltage signal, and is further converted into an analog signal.
The signal is sampled and digitized by a digital (A/D) converter 59 and sent to an arithmetic processing circuit 53. The arithmetic processing circuit 53 detects a point P that matches the level shift value described above from the digital value, calculates the coordinate xp of the bar magnet 21, that is, the input ben 20 in the X direction from that timing, and The height h of the input bench 20 is calculated accordingly.

The X coordinate value xp of the digital value obtained in this way
(or the coordinate values xp and ^sah) are temporarily stored in the memory in the arithmetic processing circuit 53, but while the signal indicating the start of measurement is being output, the measurements and calculations as described above are carried out in a predetermined manner. It is repeated every hour and its value is updated. Next, an infrared signal indicating a position input code is transmitted from the input vent 20, and when it is recognized by the arithmetic processing circuit 53 via the light receiving diode 51 and the receiving line 52, the X coordinate value of the digital value at that point is determined. As an input value, it is sent to and displayed on a gagetal display (not shown) or the like, or sent to another computer device @60 for processing.

In the embodiments described above, signals indicating measurement start, position input, etc. were transmitted from the input vent 20 to the position detection circuit 50 using infrared signals, but ultrasonic signals may also be used. Furthermore, since these signals are simply used to make the arithmetic processing circuit 54 recognize the timing of the start of operation of the position detection circuit 50 and the input of coordinate values, they do not particularly need to be sent from the input vent 20; The signal may be sent from a keyboard or other switch circuit provided in the circuit 5o itself.

Furthermore, the height of the input ben 20 can also be used as a parameter for position input. That is, a signal to start measurement is sent from the keyboard or other switch circuit, and in this state, one end of the input ben 20 is pressed against the input surface of the position detection section 10, and the height h is set to a predetermined value, for example, 0. When it becomes 5M or less, this is detected by the arithmetic processing circuit 53 and recognized as a position input signal.

Figure 20 shows the input vent 70 used at this time.
A bar magnet 73 with a tapered tip is housed in one end 72 of a pen barrel-shaped container 71 made of synthetic resin with the N pole facing toward the tip, and a cover 74 made of plastic or the like is roughly attached to the tip of the bar magnet 73. It has become. Therefore, there is no need to provide the input vent 70 itself with an electric circuit or battery as described above.
In addition, it becomes possible to use manual input in relation to the operation of the input ben 70, and the operability is not deteriorated.

In addition, the number of magnetic bodies and coils in the examples is an example,
Needless to say, it is not limited to this. Furthermore, it has been confirmed through experiments that position detection can be performed with relatively high accuracy if the distance between the coils is approximately 2 to 3 m. Further, the position specifying magnetic generator is not limited to a permanent magnet, but may be an electromagnet.

FIG. 21 shows another example of the configuration of the position detection circuit, and here a circuit for executing the second detection method of point P is shown. Initially, the cleared counter 801 is the AND gate 802
The clock pulses generated by the clock pulse oscillator 803 are counted. The count value is decoded by a decoder 804 to switch and control multiplexers 41 and 42. Further, the clock pulse is sent to the drive signal source 30 via a frequency divider 805. The detected voltage of each bridge circuit is sent to a detector 806 and a low-pass filter 807 via an amplifier 43, converted into a continuous signal shown in FIG. 8, and sent to a comparator 808. The comparator 808 compares the signal with the "0" level and outputs a one-shot pulse to the flip roller 1809 when they match. The flip-flop 809 is reset at the same time as the counter 801 is cleared, and is set upon receiving the one-shot pulse. The output of the flip 70 knob 809 closes the AND gate 802 and stops counting of the counter 801, and is sent to the host computer 811 via the output buffer 7810 to notify the detection of point P. The host computer 811 stores the counter 801 at that time.
The X coordinate value of the input ben 20 is calculated from this count value. Note that the reset signals for the counter 801 and flip-flop 809 are sent to the host computer 811.
More input buffer? 812.

FIG. 22 shows another embodiment of the invention. In the figure, 91 and 92 are position detection units in the X direction and Y direction, and 93 and 94 are signal selection circuits for the X and Y directions, which have the same configuration as the position detection unit 10 and the signal selection circuit 40, respectively. (However, the details are omitted in the drawing for simplicity.), and the position detection unit 91.9
2, the respective magnetic bodies are superimposed on each other so as to be orthogonal to the X direction and the Y direction, respectively.

A position detection circuit 95 is similar to the position detection circuit 50 except that position detection in the X and Y directions is performed alternately. Therefore, according to this embodiment, in two directions, the X direction and the Y direction, and if necessary, in the Z direction.
Direction position (coordinates) can be detected easily. In this case, Z
The position detection in the direction may be obtained from a signal from either the X-direction position detection section 91 or the Y-direction position detection section 92. Note that the X-direction and Y-direction position detecting sections 91 and 92 can also be integrated by combining the conductive plate and the magnetic plate in any order. Furthermore, the configurations of the position specifying magnetic generator and the drive signal source may be the same as in the previous embodiment.

Furthermore, since the position detection device of the present invention only needs to apply a slight steady magnetic field to the position detection section, it can also be used in combination with a touch panel or the like on the top thereof.

(Effects of the Invention) As explained above, according to the present invention, it is possible to configure a device having a transparent position detection section, and when using it by placing it on a display panel such as a liquid crystal or when inputting a negative film or the like. Lighting can be added from the bottom. In addition, since the inductance of each of the multiple coils, which changes based on the specified position of the position specifying magnetic generator, is detected from the balance of the bridge circuit including the coils, external induction, level fluctuations, noise, etc. Moreover, even if the magnetic force of the magnetic generator is weak, a large signal can be obtained. Therefore, the position detection accuracy can be improved and the position detection range can be widened. In addition, it is possible to detect the position in the height direction, and the height of the magnetic generator for position designation relative to the position detection part can be used as a parameter for timing detection when specifying the position, and the magnetic generator for position designation itself has an electric circuit. It becomes possible to specify a position without providing a battery or a battery, and in conjunction with the operation of the position specifying magnetic generator. In addition, since there is no need to exchange signals between the position specifying magnetic generator and other devices for position detection, it can be cordless. The damage is only a few oersteds (Oe), so
The magnetic generator for position specification can specify the position even if it is separated from the position detection part by some distance, and it is also possible to specify the position from the back side of the position detection part, and metal other than ferromagnetic material can be placed on the input surface. You can also. Moreover, according to the one in which the position detection section is provided in the X direction and the Y direction, two directions, the X direction and the Y direction,
In addition to this, there is an advantage that the position can be detected in three directions including the height (Z) direction.

[Brief explanation of the drawing]

The drawings serve to explain the present invention. Fig. 1 is an explanatory diagram showing the main structure of the present invention, Fig. 2 is a characteristic diagram of magnetic bias versus magnetic permeability, and Fig. 3 is a diagram from a magnetic generator for position specification. Figure 4 is a graph showing the amount of magnetic bias applied to the magnetic material by a bar magnet.
Fig. 5 is a graph showing the magnetic permeability of a magnetic material given a magnetic bias by a bar magnet, Fig. 6 is a diagram showing an example of the configuration of a bridge circuit according to the present invention, and Fig. 7 is a bridge circuit shown in Fig. 6. 1 to the coil. Fig. 8 is a graph showing the change in the output voltage of the bridge circuit shown in Fig. 6, Fig. 9 is a graph showing 1 as in the position detection of zero cross point P, Fig. 10 is a graph showing the change in inductance of 2, Fig. FIG. 11 is an exploded perspective view showing the specific configuration of the position detection unit 10, FIG. 11 is a view showing how the magnetic plate is manufactured, FIG. 12 is a perspective view of the conductive plate, and FIG.
Figure 14 is a perspective view showing another example of the conductor plate, Figure 14 is a sectional view showing the specific configuration of the input pen, Figure 15 is its electric circuit diagram, and Figure 16 is the specific configuration of the drive signal source. 17 is a specific circuit diagram of the signal selection circuit, FIG. 18 is a circuit block diagram showing the specific configuration of the position detection circuit,
FIG. 19 is a diagram showing signal waveforms at each part in FIG. 18,
FIG. 20 is a sectional view showing another embodiment of the input pen;
The figure is a circuit block diagram without showing other specific configurations of the position detection circuit, and FIG. 22 is an explanation and diagram showing another embodiment of the present invention. 10... Position detection unit, 20... Input pen, 30...
- Drive signal source, 40... Signal selection circuit, 50... Position detection circuit, 11... Magnetic body, 12a, 12b...
Conductor plate, 13a to 13j... Coil, 91... X direction position detection section, 92... Y direction position detection section 121...
- Transparent substrate, 122... conductor. Patent applicant Wacom Co., Ltd. Patent attorney Furu 1) Takashi Seiji Figure 2 0.5 1.0 1.6 2.0 Magnetism/Oe Figure 4 Figure 5 μ × Direction coordinates Figure 7 Figure 8 Figure 9 Figure 11 Figure 12 Figure 13 Figure 20 Figure 22 Procedural Amendment Initial Form) December 26, 1985 Commissioner of the Patent Office Uga Michibe 1 Case Indication 1985 Patent Application No. 187885 2. Name of the invention Position detection device 3. Relationship with the person making the amendment Patent applicant address 5-23-4 Sakurada, Washinomiya-cho, Kitakatsushika-gun, Saitama Name Wacom Co., Ltd. Representative Furu 1) Former male 4th representative Person 〒105 Wi (03)508-9866
Address: 1-15-11 Toranomon, Minato-ku, Tokyo Name (6998) Patent Attorney Yoshi 1) Date of Notification of Sei Ko 5 Amendment Order November 6, 1985 November 26, 1985 (Shipping date) ) 6. Target of amendment “Drawing” 7. Contents of amendment: Engraving of the drawing (no change in content)

Claims (2)

[Claims] (1) A plurality of thin wire-shaped magnetic bodies arranged substantially parallel to each other, and two conductor plates formed by forming a plurality of transparent or thin wire-shaped conductors on a transparent substrate at predetermined intervals and substantially parallel to each other. The two conductor plates are stacked on both sides of the plurality of magnetic bodies so that the magnetic bodies and the conductors are perpendicular to each other, and the conductors on the two conductor plates are connected vertically to form a plurality of coils. a position detecting section, a position specifying magnetic generator that generates a steady magnetic field, a drive signal source that generates an alternating signal with a predetermined cycle, two of the coils, and a predetermined impedance element; A bridge circuit is configured using an alternating signal as a power source, a signal selection circuit sequentially switches and connects the plurality of coils as coils of the bridge circuit, and voltages generated between the detection terminals of the bridge circuit are sequentially extracted and from these. A position detecting device comprising a position detecting circuit for determining a specified position on a position detecting section by the position specifying magnetic generator. (2) Two sheets consisting of a plurality of thin wire-like X-direction magnetic materials arranged substantially parallel to each other and a plurality of transparent or thin wire-like conductors arranged substantially parallel to each other at a predetermined interval on a transparent substrate. an X-direction conductor plate, the two X-direction conductor plates are superimposed on both sides of the plurality of X-direction magnetic bodies so that the magnetic bodies and the conductors are perpendicular to each other, and the two X-direction conductor plates are An X-direction position detection section in which conductors on a conductor plate are connected vertically to form a plurality of X-direction coils, and a Y-direction position detection section that has a similar configuration to the X-direction position detection section and is overlapped therewith. , a position specifying magnetic generator that generates a steady magnetic field, a drive signal source that generates an alternating signal with a predetermined period, two of the X-direction and Y-direction coils, and a predetermined impedance element. and an X-direction and a Y-direction bridge circuit configured using the alternating signal as a power source, and sequentially switching and connecting the plurality of X-direction and Y-direction coils as coils of the X-direction and Y-direction bridge circuit. The voltages generated between the Y-direction signal selection circuit and the detection terminals of the X-direction and Y-direction bridge circuits are taken out one after another, and from these voltages are detected on the X-direction and Y-direction position detection section by the position specifying magnetic generator. A position detection device consisting of a position detection circuit for determining the specified position of.