JPH0877894A - Touch position detecting device - Google Patents

Abstract

PURPOSE: To provide a detecting panel whose whole surface is transparent by performing capacity coupling on an electrode on the obverse of a transparent film and wiring on the reverse, providing receiving side scan sense circuits on both ends of conductors, and using a transistor amplifier as an input stage of the scan sense circuits. CONSTITUTION: Scan sense circuits 30A and 30B receive signals transmitted by passing through respective conductors Y1 to Y4 by successively scanning the conductors Y1, Y2, Y3 and Y4 when scan drive circuits 20A and 20B send out signals to a single one among respective conductors X1, X2, X3 and X4. Signals outputted from the two scan drive circuits 20A and 20B are inputted to an adding circuit 40, and the mutual two signals are added together, and are outputted as a single received signal. Operation is performed by a control circuit 50 to control scanning of the scan drive circuits 20A and 20B and the scan sense circuits 30A and 30B.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a touch position detecting device for detecting the touch position on the panel surface of the finger when the panel surface is touched with a finger, for example.

[0002]

2. Description of the Related Art Conventionally, the capacitance change between when a panel surface is touched and when it is not touched is
A touch position detection device that detects a signal change such as a phase change has been proposed (for example, “PCT International Publication Number W”).
O92 / 08947 ”,“ PCT International Publication Number W ”
O92 / 14604 publication "," IEEE COMPU
TER SOCIETY PRESS REPORT,
'A CAPACITANCE-BASED PROX
IMITY SENSOR FOR WHOLEARM
OBSTACLE AVOIDANCE ', J.
L. Noval, J .; T. Feddema, Repr
integrated form PROCEEDINGS OF
THE 1992 IEEE INTERNATIO
NAL CONFERENCE ON ROBOTIC
S AND AUTOMATION, Nice, F
lance, May, 12-14, 1994 ”).

[0003]

However, the conventional touch panel uses a metal conductor such as copper or aluminum for electrodes and wirings, and the touch panel itself is opaque because the metal conductor is opaque. By making this touch panel transparent, for example, by incorporating this touch panel in a show window, suspending the display for the touch panel on the back side of the show window, and touching the surface of the show window with a finger, etc., The built-in touch panel can be used for various purposes, and when the touch panel is not needed, the interior of the show window can be seen as it is by simply removing the display for the touch panel. Become.

To form a transparent touch panel, an insulating light-transmitting plate (including a hard plate and a flexible sheet) is prepared, and a light-transmitting conductor is placed on the light-transmitting plate. Although the electrodes and wiring are formed by using, the light-transmissive plate and the light-transmissive conductor are not completely transparent bodies even though they transmit light, and the light-transmissive conductor is a conductor. For example, the resistance value is significantly larger than that of copper. For example, in the case of a wiring having a copper wiring resistance value of 0.2 to 0.3Ω, if the same wiring is performed using a light transmissive conductor, the wiring resistance becomes 3 to 5 kΩ, Since it shows an extremely high resistance value, on the other hand, the change in electrostatic capacity due to whether the surface of the glass of the show window is touched with a finger is extremely weak, etc. Simply replacing the material with a light-transmissive material It is not possible to secure sufficient brightness or perform accurate detection.

In view of the above circumstances, it is an object of the present invention to provide a touch panel detection device which solves the problems in forming a transparent touch panel.

[0006]

A first touch position detecting device of the present invention which achieves the above object, comprises an insulating light-transmitting plate and first crossing wires which are wired to the light-transmitting plate. And a second touch panel disposed on the back surface of the insulating plate having a plurality of light-transmissive conductors extending in a matrix in the second direction, and detecting a capacitance change at the intersection of these light-transmissive conductors. Thus, in the touch position detecting device for detecting the touch position when the surface of the insulating plate is touched, the first light transmissive wire extending in the first direction among the plurality of light transmissive conductive wires forming the touch panel. Conductive wires and second light-transmissive conductive wires extending in the second direction are respectively wired on the surface of the light-transmissive plate on the side of the insulating plate and the back surface on the back side of the surface of the light-transmissive plate. At the intersection, above A first light transmissive electrode connected to the first light transmissive conductor and a second light transmissive electrode spaced from the first light transmissive electrode for detecting whether or not the surface of the edge plate is touched. A light-transmissive electrode is further provided, and the second light-transmissive conductor is connected to the second light-transmissive conductive wire at a position on the back surface of the light-transmissive plate facing the second light-transmissive electrode. And a third light-transmissive electrode capacitively coupled to the conductive electrode.

Further, a second touch position detecting device of the present invention which achieves the above object, is an insulating light transmitting plate, and a first direction and a first direction which are wired to the light transmitting plate and intersect each other. A plurality of light-transmissive conducting wires extending in the direction of 2 are provided on the back surface of the insulating plate, and the insulation is obtained by detecting the capacitance change at the intersection of these light-transmissive conducting wires. In a touch position detection device for detecting a touch position when the surface of a plate is touched, a first light-transmitting conductive wire and a second light-transmitting conductive wire extending in a first direction among a plurality of light-transmitting conductive wires forming the touch panel. A transmitter for transmitting a signal, which is connected to one of the second light-transmissive conductors extending in the direction of, and the one of the first light-transmissive conductor and the second light-transmissive conductor. The transmitter is connected A receiver connected to the other conductor different from the one conductor and receiving a signal that changes depending on whether or not the surface of the insulating plate is touched, and the receiver is connected to the other conductor. Further, it is characterized in that a grounded base type transistor amplifier is provided.

The third aspect of the present invention which achieves the above object.
Of the touch position detecting device described above, an insulating light-transmissive plate and a plurality of light-transmissive conductors wired in the light-transmissive plate and extending in a matrix in a first direction and a second direction intersecting each other. And a touch panel disposed on the back surface of the insulating plate, the touch detecting the touch position when the surface of the insulating plate is touched by detecting the capacitance change at the intersection of these light-transmitting conductive wires. In the position detecting device, one of a first light-transmitting conductive wire extending in a first direction and a second light-transmitting conductive wire extending in a second direction among a plurality of light-transmitting conductive wires forming the touch panel. A transmitter for transmitting a signal, the transmitter being connected to a conductor of
Whether or not the surface of the insulating plate, which is connected to both ends of the other conductive wire different from the one conductive wire to which the transmitter is connected, of the light transparent conductive wire and the second light transparent conductive wire It is characterized in that it is provided with a receiver that receives a signal that changes depending on the above, and an adder that adds the output signals of these receivers.

In the third touch position detecting device, it is preferable that the transmitter is connected to both ends of the one conducting wire. Further, in the third touch position detection device, it is preferable that the transmitter changes a level of a signal transmitted from the transmitter according to a position of the intersection.

In the above first to third touch position detecting devices, the term "plate" is a term including not only a rigid plate but also a flexible sheet or the like.

[0011]

In order to detect the touch position, for example, a touch panel is used in which electrodes are arranged in a matrix form vertically and horizontally on a substrate, and an electrode for detecting a capacitance change is formed at the intersection of these wires. At this time, for example, the vertical wiring is formed on the front surface of the substrate and the horizontal wiring is formed on the back surface of the substrate so that the vertical wiring and the horizontal wiring do not short-circuit. On the other hand, since the electrode is arranged on the surface of the substrate adjacent to the glass plate or the like on which the surface is touched, the electrode arranged on the surface of the substrate and the wiring formed on the back surface of the substrate are electrically connected. There is a need to.

Conventionally, as a method of this connection, a through hole is formed on the substrate, and the connection is made through the conductor in the through hole. When this is applied to a transparent touch panel, even if a thin transparent substrate (light-transmissive plate according to the invention) is used, a through-hole is formed in the substrate and a light-transmissive conductor (light-transmissive) is formed in the through-hole. If the conductive wire and the light-transmissive electrode) are packed, the light transmittance of the through hole is largely different from that of the surrounding area, resulting in a considerably unsightly touch panel. Also, forming the through hole is technically difficult.

On the other hand, in the first touch position detecting device of the present invention, electrodes (second electrode and third electrode) are formed on the front surface and the back surface of the light transmissive plate at positions facing each other. Since the wiring on the back surface of the light-transmissive plate and the electrode on the front surface are capacitively coupled, a touch panel detection device including a visually uniformly transparent touch panel can be configured. Further, for example, the capacitance change caused by touching the surface of a glass plate (an example of the insulating plate according to the invention) with a finger is extremely weak. Therefore, a fairly sensitive receiver is required to detect the extremely weak capacitance change.

However, as described above, the light-transmissive conductor has a resistance value which is considerably higher than that of copper or the like, although it is a conductor, and therefore, there is a possibility that a considerably large noise is mixed. Therefore, the receiver of the conventional touch panel in which wiring and electrodes are formed of copper has an unsatisfactory S / N ratio and cannot perform highly accurate detection. According to the second touch position detecting device of the present invention, the receiver includes a grounded base transistor amplifier, and the grounded base transistor amplifier can be configured as an amplifier having a sufficiently low input impedance. The amplifier has a simple structure, is not easily affected by noise, can perform highly accurate detection, and is advantageous in terms of cost and space.

Further, since the light-transmissive conductor has a considerably large resistance value, there was no problem when the wiring and the electrodes were formed of copper. The first light-transmissive conductor and the second light-transmissive conductor did not pose a problem. The level of the received signal greatly changes according to the position of the intersection with the sex conductor, that is, the length of the path until the signal sent from the transmitter reaches the receiver. The threshold value also needs to be greatly changed at each intersection, and a complicated detection circuit is required.

In the third touch position detecting device of the present invention,
A receiver is connected to both ends of a receiving-side conductive wire (“the other conductive wire” in the present invention) of the first light-transmitting conductive wire and the second light-transmitting conductive wire, and output signals of those receivers are connected to each other. Since an adder for adding is provided, a signal of a level that does not much depend on the position is obtained regardless of the position of the crossing point on the receiving side conducting wire (the other conducting wire), and subsequent signal processing for touch presence / absence determination The circuit is simplified.

Further, in the third touch position detecting device, if the transmitter is also provided at both ends of the conducting wire on the transmitting side ("one conducting wire" in the present invention), the direction of the conducting wire on the transmitting side is also set. A position-insensitive signal is obtained, and the subsequent signal processing circuit is further simplified. Further, in the third touch position detecting device, when the transmitter changes the signal level according to the intersection position, it is possible to obtain a reception signal of a more stable level regardless of the intersection position. .

[0018]

Embodiments of the present invention will be described below. FIG. 1 is a circuit block diagram of a touch position detecting device according to an embodiment of the present invention. In this embodiment, a large number of resistors R are arranged vertically and horizontally.
However, these resistances are schematic representations of the light-transmissive conductive wire, and represent that the light-transmissive conductive wire has a considerably high resistance value.

A variable capacitance C is shown at each intersection of a conductor wire extending in the horizontal direction and a conductor wire extending in the vertical direction. These variable capacitors are the intersections depending on whether or not the surface of the glass is touched with a finger. It is shown that the capacitance between the electrodes arranged at is changed. Details will be described later. The touch position detecting device is provided with an oscillator 10, and a signal from the oscillator 10 is input to scan drive circuits 20A and 20B connected to the upper and lower ends of a conductor wire extending in the vertical direction. The scan drive circuits 20A and 20B amplify the signal of the oscillator 10 and sequentially send the signal to four conductors X1, X2, X3 and X4 extending in the vertical direction. In the present embodiment, the combination of the oscillator 10 and the scan drive circuit 20A and the combination of the oscillator 10 and the scan drive circuit 20B are respectively considered as the transmitter in the present invention.

Also, four conductors Y1 and Y extending in the lateral direction.
2, one end of Y3, Y4 Y1a, Y2a, Y3a, Y4a
And scan sense circuits 30A and 30B are connected to the other ends Y1b, Y2b, Y3b, and Y4b. The scan sense circuits 30A and 30B are examples of receivers according to the present invention. Scan sense circuit 30A,
In 30B, while the scan drive circuits 20A and 20B are sending a signal to one of the conductors X1, X2, X3, and X4, the conductors Y1, Y2, Y3, and Y4 are sequentially scanned to scan the conductors Y1. , Y2, Y3, Y4, the received signal is received. The signals output from the two scan sense circuits 30A and 30B are input to the adder circuit 40. In the adder circuit 40, the two input signals are added together and output as one received signal.

The scanning control circuits 50 of the scan drive circuits 20A and 20B and the scan sense circuits 30A and 30B are used. FIG. 2 is a schematic perspective view showing one intersection of the touch panel on which the conducting wire (resistance R) and the electrode (capacitance C) shown in FIG. 1 are formed. On the side of the front surface 100A of the transparent film 100 (an example of the light transmissive plate according to the present invention), the receiving side conducting wires Y1, Y2, Y3, Y4 extending in the lateral direction of FIG. 1 are formed, and on the back surface 100B side. , The transmission line X extending in the vertical direction in FIG.
1, X2, X3 and X4 are formed. However, Figure 2
Then, those conductors Y1, Y2, Y3, Y4; X1, X
Of the points 2, 2, X3 and X4, only the intersection of the conductor Y1 and the conductor X1 is drawn. This intersection will be described below, but the same applies to each of the other intersections.

At the intersection of the conducting wire Y1 and the conducting wire X1 on the surface 100A of the transparent film 100, the first electrode 101 and the second electrode 10 made of the same light-transmissive conductor as the conducting wire.
2 are spaced apart from each other. Of these two electrodes, the first electrode 101 is connected to the conducting wire Y1 formed on the surface 100A. In addition, the transparent film 10
A third electrode 103 is formed on the back surface 100B of 0 at a position facing the second electrode 102 formed on the front surface 100A. The third electrode 103 is connected to the conducting wire X1 formed on the back surface. The second electrode 102 and the third electrode 103 are capacitively coupled, and output from the oscillator 10 shown in FIG. 1 and the scan drive circuits 20A and 2A.
The signal sent to the conductor X1 via 0B is transmitted to the second electrode 102 via the capacitive coupling of the second and third electrodes 102 and 103.

FIG. 3 is a diagram showing a state in which the surface of the glass plate is touched with a finger and a circuit diagram of a signal detection preamplifier. Surface 1 of transparent film 100 shown in FIG.
00A is laminated with another transparent film 110 for protection of the electrodes 101, 102 and the conductor Y1 on the surface, and the surface of the transparent film 110 is made of glass 1
It is attached to the back surface 120B of 20. This glass 12
0 is an example of the insulating plate referred to in the present invention.

When a finger touches the surface of the glass 120, the signal from the oscillator 10 passes through the third electrode 103 and the second electrode 102, and the capacitance between the second electrode 102 and the finger, The scan sense circuits 30A and 30A shown in FIG. 1 are transmitted to the first electrode 101 via the capacitance between the finger and the first electrode 101, and via the conducting wire Y1 shown in FIG.
Input to B.

In the signal transmission path shown in FIG. 3, the capacitance between the third electrode 103 and the second electrode 102 and the second electrode 102 and the first electrode 101 via the finger are used. The capacitance between them is connected in series, but the capacitance between the second electrode 102 and the first electrode 101 via the finger is the one between the third electrode 103 and the second electrode 103. Since it is sufficiently smaller than the capacitance between the second electrode 102 and the first electrode 101, the capacitance formed in series is the capacitance itself between the second electrode 102 and the first electrode 101.

The input stage of the scan sense circuits 30A and 30B is provided with a grounded base type transistor amplifier 31 having the circuit configuration shown in FIG. The input impedance of the amplifier 31 is determined by the resistor R shown in the figure. By using a pure resistor having a sufficiently small resistance value and a sufficiently small capacitance component and inductor component as the resistor R, the impedance is flat from the low frequency region to the high frequency region. And a sufficiently small amplifier 31 is realized. Moreover, this amplifier 3
The circuit configuration of No. 1 is simpler than that of, for example, an operational amplifier, so that the circuit can be downsized and the cost can be reduced.

The signal transmitted to the first electrode 101 via the third electrode 103 and the second electrode 102 has already been attenuated considerably, and the first electrode 101 and the amplifier 3 have already been attenuated.
The signal arriving at the amplifier 31 tends to be further attenuated due to signal attenuation due to the resistance of the lead wire between the first electrode 101 and the signal line 1 and leakage of the signal due to the stray capacitance. Since there is a high resistance, the noise is easily mixed.

In the present embodiment, since the amplifier 31 having a sufficiently small input impedance is provided, it is possible to pick up a signal with considerably high accuracy even under such a bad condition. In the present embodiment, the signal transmitted from the oscillator 10 is output from the amplifier 31 according to the presence / absence of touch by the finger.
It is output as signals with different amplitudes. Next, in the embodiment shown in FIG. 1, scan drive circuits 20A, 20B
And scan sense circuits 30A and 30B each have two
Explain the reason for each.

FIG. 4 is a circuit diagram including one scan drive circuit and one scan sense circuit for comparison with FIG. 1, and FIG. 5 is a diagram showing the resistance value of the lead wire with respect to the scan position. Each intersection P1, shown in FIG.
P2 and P3 are points P1, P2 and P2 having the same reference numerals shown in FIG.
It corresponds to P3, and, for example, when detecting the signal at the intersection P1, that is, it sends the signal to the conductor X1 and conducts the conductor Y1.
When detecting a signal that has passed through, the conductor X1 between the scan drive circuit 20 and the scan sense circuit 30 is detected.
The resistance value of Y1 is the value indicated by the point P1 in FIG. As described above, the resistance value of the signal line passing through the intersection greatly differs depending on which intersection is to be detected.

FIG. 6 is a diagram showing the output signal V ₀ from the scan sense circuit with respect to the scan position in the case of the circuit configuration shown in FIG. FIG. 6 shows the signal level of the signal transmitted through the conductor Y1, that is, the signal level when the respective intersections of the conductors X1, X2, X3, X4 and the conductor Y1 are selected. Graph Q in the figure
Is the signal level when the surface 120A (see FIG. 3) of the glass plate 120 is touched with a finger, and the graph R is the signal level when the finger is not touched. These signal levels greatly differ depending on the scan position.

Moreover, in FIG. 6, as described above, the lead wire Y1 is used.
FIG. 5 shows the signal level regarding only each of the conductors Y1, Y2, Y3, Y as shown in FIG.
The signal level is different for each four. Therefore, in order to detect whether or not the finger is touched, it is necessary to greatly change the threshold value at each intersection, which makes the detection circuit extremely complicated.

FIG. 7 is a diagram showing the resistance value of the conductor Y1 in the circuit configuration shown in FIG. For example, the resistance value between the scan drive circuit 20A and the scan sense circuit 30B changes like the graph S according to the scan position as in FIG. 5, while the scan drive circuit 20A and the scan sense circuit 30A change. The resistance value between and changes like the graph T. Therefore, if the scan sense circuits 30A and 30B are provided at both ends and the reception signals obtained by the scan sense circuits 30A and 30B are added together, the resistance value of the graph S and the resistance value of the graph T are parallel to each other. And the combined resistance value thereof is a value that does not depend much on the scan position, as shown in the graph U.

FIG. 8 is a diagram showing the received signal level after addition, which is output from the adder circuit 40 in the circuit configuration shown in FIG. This figure also shows only the conductor Y1. Since the combined resistance value is almost flat as shown by the graph U in FIG. 7, the conductors Y1, Y2 are not affected by the scan position regardless of whether the finger is touched (graph Q) or the finger is separated (graph R). , Y3, Y4 are almost constant. Therefore, the threshold value of each conductor Y1, Y2, Y3, Y
Only one value is required for each 4 and the configuration of the detection circuit becomes simple. Moreover, in the embodiment shown in FIG. 1, the scan drive circuits 20A and 20B are also provided at both ends, and each conductor X
Since 1, X2, X3, and X4 are driven from both ends, the change in the signal level due to the scanning of the conductors Y1, Y2, Y3, and Y4 is reduced, and the conductors Y1 and Y4 are reduced.
The change in the threshold value for each of Y2, Y3, and Y4 may be small, or it is possible to detect with only one threshold value over all intersections without changing the threshold value. In that case, the gains of the scan drive circuits 20A and 20B are made variable, and the conductors Y1, Y2 and the scan sense circuits 30A and 30B are used.
By adjusting the gain according to the scanning of Y3 and Y4, it is possible to always obtain the signal of the level along the graph Q and the graph R shown in FIG. 8 regardless of the conductors Y1, Y2, Y3 and Y4. More stable detection can be performed by using only one threshold value for the intersection.

[0034]

As described above, according to the present invention,
Various problems in constructing a transparent touch panel are solved, and a transparent touch panel is provided, and by attaching the touch panel to a transparent body such as glass, it is possible to construct a detection panel of which the entire surface is transparent. A touch position detection device that can detect a touch position touched over the area is realized.

[Brief description of drawings]

FIG. 1 is a circuit block diagram of a touch position detection device according to an embodiment of the present invention.

FIG. 2 is a schematic perspective view showing one intersection of the touch panel on which the conductive wire (resistance R) and the electrode (capacitance C) shown in FIG. 1 are formed.

FIG. 3 is a diagram showing a state in which the surface of a glass plate is touched with a finger and a circuit diagram of a signal detection preamplifier.

FIG. 4 is a circuit diagram including one scan drive circuit and one scan sense circuit for comparison with FIG.

FIG. 5 is a diagram showing a resistance value of a conductive wire with respect to a scan position.

6 is a diagram showing an output signal V ₀ from a scan sense circuit with respect to a scan position in the case of the circuit configuration shown in FIG.

FIG. 7 is a diagram showing a resistance value of a conductor Y1 in the circuit configuration shown in FIG.

FIG. 8 is a diagram showing a reception signal level after addition, which is output from the addition circuit in the circuit configuration shown in FIG. 1.

[Explanation of symbols]

 10 Oscillator 20A, 20B Scan drive circuit 30A, 30B Scan sense circuit 31 Amplifier 40 Adder circuit 50 Control circuit 100, 110 Transparent film 101 First electrode 102 Second electrode 103 Third electrode

Front page continuation (72) Inventor Kazumasa Mori 3-12-2 Nihonbashi, Chuo-ku, Tokyo Inside Topre Co., Ltd.

Claims (5)

[Claims] 1. An insulating light-transmissive plate, and a plurality of light-transmissive conductors wired in the light-transmissive plate and extending in a matrix in a first direction and a second direction intersecting each other. A touch position detection device that includes a touch panel that is disposed on the back surface of the insulating plate, and that detects a touch position when the surface of the insulating plate is touched by detecting a capacitance change at the intersection of the light-transmitting conductive wires. In the plurality of light transmissive conductive wires forming the touch panel, a first light transmissive conductive wire extending in the first direction and a second light transmissive conductive wire extending in the second direction are the light transmissive conductive wires. A surface of the insulating plate and the back surface of the back surface of the insulating plate, respectively, for detecting whether or not the surface of the insulating plate is touched at the intersection of the surface of the light transmissive plate. , The first light transmission A first light-transmissive electrode connected to a conductive line and a second light-transmissive electrode separated from the first light-transmissive electrode, and further comprising the second light on the back surface of the light-transmissive plate. A third light-transmitting electrode connected to the second light-transmitting conductive wire and capacitively coupled to the second light-transmitting electrode is provided at a position facing the transparent electrode. Touch position detection device. 2. An insulating light-transmissive plate and a plurality of light-transmissive conducting wires, which are arranged on the light-transmissive plate and extend in a matrix in a first direction and a second direction intersecting each other. A touch position detection device that includes a touch panel that is disposed on the back surface of the insulating plate, and that detects a touch position when the surface of the insulating plate is touched by detecting a capacitance change at the intersection of the light-transmitting conductive wires. In one of a plurality of light-transmissive conductive wires forming the touch panel, one of a first light-transmissive conductive wire extending in the first direction and a second light-transmissive conductive wire extending in the second direction. A transmitter for transmitting a signal, which is connected to a conductor, and a conductor different from one conductor to which the transmitter is connected, of the first light-transmissive conductor and the second light-transmissive conductor. Connected, said insulation And a receiver for receiving a signal that changes depending on whether or not the surface of the touch panel is touched, the touch position including a grounded-base transistor amplifier connected to the other conductor. Detection device. 3. An insulating light-transmissive plate, and a plurality of light-transmissive conductive wires, which are wired in the light-transmissive plate and extend in a matrix in a first direction and a second direction intersecting each other. A touch position detection device that includes a touch panel that is disposed on the back surface of the insulating plate, and that detects a touch position when the surface of the insulating plate is touched by detecting a capacitance change at the intersection of the light-transmitting conductive wires. In one of a plurality of light-transmissive conductive wires forming the touch panel, one of a first light-transmissive conductive wire extending in the first direction and a second light-transmissive conductive wire extending in the second direction. A transmitter for transmitting a signal, which is connected to a conductor, and a conductor different from one conductor to which the transmitter is connected, of the first light-transmissive conductor and the second light-transmissive conductor. Connected to both ends A touch position detecting device comprising a receiver for receiving a signal that changes depending on whether or not the surface of the insulating plate is touched, and an adder for adding output signals of these receivers. . 4. The touch position detecting device according to claim 3, wherein the transmitter is connected to both ends of the one conducting wire, respectively. 5. The touch position detection device according to claim 3, wherein the transmitter changes the level of a signal transmitted from the transmitter according to the position of the intersection. .