JP2016020814A - Piezoelectric sensor switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a piezoelectric sensor switch with a simple structure and capable of making the sensor switch thin, and maintaining excellent detection accuracy over a long term.SOLUTION: A piezoelectric sensor switch includes: a piezoelectric sheet; a grand electrode integrally laminated on a first surface of the piezoelectric sheet; and a signal electrode sheet integrally laminated on a second surface of the piezoelectric sheet. The signal electrode sheet includes an electric insulation sheet, and a plurality of signal electrodes integrally laminated on a surface opposite to the piezoelectric sheet in the electric insulation sheet so as to be electrically independent to each other.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a piezoelectric sensor switch.

  Conventionally, a keyboard is used as an input device to an electronic device such as a personal computer. In recent years, with the miniaturization of electronic devices, there has been a demand for thinner keyboards.

  Patent Document 1 discloses an input device that operates a switch to convert information input by an input operation by an operator into an appropriate electrical signal and outputs the electrical signal. The input device is formed by stacking a plurality of sheet-like members. An input device is disclosed in which a plurality of input mechanisms including the switch and stress generating means are provided between the sheet-like members, and stress is fed back to the operator from the stress generating means simultaneously with the operation of the switch. .

  Further, in Patent Document 2, a dielectric layer made of a foam and elastically stretchable in the front and back direction, a front base material disposed on the front side of the dielectric layer, and disposed on the back side of the dielectric layer. A cover member having a back-side base material, and disposed on the inside of a portion where the tear is likely to enter and around the dielectric layer of the outer edge of the cover member when viewed from the front side or the back side, and the front-side base material and the back-side base material Between the front side adhesive layer and the back side adhesive layer, the back side adhesive layer bonded to the surface of the back side base material, and between the front side adhesive layer and the back side adhesive layer A double-sided adhesive member having an intervening core layer; and a gas flow with respect to the dielectric layer in a crossing direction that is partitioned between a pair of adjacent circumferential ends of the double-sided adhesive member and intersects the front and back direction. There is disclosed a capacitive sensor comprising a through hole for securing a passage.

JP-A-8-284063

  The switches of the input device of Patent Document 1 are provided in a number corresponding to each key display. This switch includes a number of contact electrodes and piezoelectric elements corresponding to the key display. Therefore, there is a problem that the structure becomes complicated when the number of keys increases as in a keyboard.

  Moreover, the electrostatic capacitance type sensor of patent document 2 is detecting the presence or absence of a load by measuring the change of the electrostatic capacitance when a dielectric layer deform | transforms. However, when the dielectric layer deteriorates with time, a situation occurs in which the dielectric layer is not restored to the original state even though the load applied to the dielectric layer is removed. In such a state, although the load is not applied to the capacitive sensor, the capacitive sensor has a problem of erroneously detecting that a load is applied thereto.

  The present invention provides a piezoelectric sensor switch that has a simple structure and can be thinned, and that maintains excellent detection accuracy over a long period of time.

  The piezoelectric sensor switch of the present invention includes a piezoelectric sheet, a ground electrode laminated and integrated on the first surface of the piezoelectric sheet, and a signal electrode sheet laminated and integrated on the second surface of the piezoelectric sheet. The signal electrode sheet has an electrical insulating sheet and a plurality of signal electrodes laminated and integrated electrically independently from each other on the surface of the electrical insulating sheet facing the piezoelectric sheet. It is characterized by.

  In the piezoelectric sensor switch, the piezoelectric sheet is formed from a single sheet.

  In the piezoelectric sensor switch, conductive wires electrically connected to the signal electrodes are disposed on the surface of the electrical insulating sheet of the signal electrode sheet opposite to the piezoelectric sheet, and electrically connected to each signal electrode. It is characterized by being.

  In the piezoelectric sensor switch, the conductive wire connected to the signal electrode penetrates the electrical insulating sheet of the signal electrode sheet.

  In the piezoelectric sensor switch, the piezoelectric sheet is formed of a synthetic resin foam sheet.

  In the piezoelectric sensor switch, the piezoelectric sheet is a polypropylene resin foam sheet.

  Since the piezoelectric sensor switch of the present invention has the above-described configuration, the structure can be simplified and thinned.

  Furthermore, the piezoelectric sensor switch of the present invention detects the presence or absence of a load by a potential generated when the piezoelectric sheet is compressed in the thickness direction. The piezoelectric sheet only needs to be compressed and deformed in the thickness direction when a load is applied, and does not necessarily need to be restored to its original state when the load is removed. Even if the piezoelectric sheet deteriorates over time, the compression and deformation in the thickness direction when a load is applied is maintained, so the piezoelectric sensor switch of the present invention is excellent for a long period of time. Maintain sensor accuracy.

  In the above piezoelectric sensor switch, when the piezoelectric sheet is formed from a single sheet, the structure can be simplified, the production efficiency can be improved by reducing the number of components, and the weight can be reduced. Can also be achieved.

  In the piezoelectric sensor switch, conductive wires electrically connected to the signal electrodes are disposed on the surface of the electrical insulating sheet of the signal electrode sheet opposite to the piezoelectric sheet, and electrically connected to each signal electrode. The conductive wire electrically connected to each signal electrode can be arranged on the electric insulating sheet without considering the arrangement position of the other signal electrodes. Conductive wires can be easily arranged.

  In the piezoelectric sensor switch described above, when the conductive wire connected to the signal electrode penetrates the signal electrode sheet, the conductive wire connected to each signal electrode is connected to the signal electrode in the electrical insulating sheet of the signal electrode sheet. It can be easily pulled out and arranged on the surface opposite to the arrangement surface, and further, the length of the conductive wire can be shortened to suppress the generation of noise.

  In the above piezoelectric sensor switch, when the piezoelectric sheet is formed of a foam sheet, when the piezoelectric sensor switch is pressed with a finger or the like, the piezoelectric sensor switch is deformed, and the user feels that the piezoelectric sensor switch has been pressed. The piezoelectric sensor switch can be pressed more reliably.

  In the piezoelectric sensor switch, when the piezoelectric sheet is a polypropylene-based resin foam sheet, the piezoelectricity of the piezoelectric sheet is excellent, and the presence or absence of a load applied to the piezoelectric sensor switch can be detected more accurately.

It is sectional drawing which showed the piezoelectric sensor switch of this invention. It is a disassembled perspective view of the piezoelectric sensor switch of FIG. It is a figure which shows the whole structure of an input system. It is a figure which shows the hardware constitutions at the time of implement | achieving the input system of FIG. 3 using CPU. It is the figure which showed the position key table.

  An example of the piezoelectric sensor switch A of the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, the piezoelectric sensor switch A has a piezoelectric sheet 1. The piezoelectric sheet 1 preferably has a constant thickness. Since the piezoelectric sheet 1 has a constant thickness, the thickness of the piezoelectric sensor switch can be made constant, and the load applied to each sensor portion of the piezoelectric sensor switch can be detected more accurately. For example, when the piezoelectric sensor switch is used as an input device such as a keyboard, input work from the piezoelectric sensor switch can be performed smoothly.

  The piezoelectric sheet 1 is not particularly limited as long as it is a sheet (sheet having a piezoelectric phenomenon) that can generate charges on the surface by applying an external force. As the piezoelectric sheet 1, a piezoelectric sheet obtained by imparting polarization to a synthetic resin sheet (synthetic resin foam sheet or synthetic resin non-foamed sheet) is preferable because it has high sensitivity and easily generates electric charges due to deformation in the thickness direction. A piezoelectric sheet obtained by imparting polarization to the foam sheet is more preferable.

  The synthetic resin constituting the synthetic resin sheet is not particularly limited, and examples thereof include polyolefin resins such as polyethylene resins and polypropylene resins, polyvinylidene fluoride, polylactic acid, and liquid crystal resins, and polyolefin resins are preferable. Polypropylene resin is more preferable.

  The method for imparting polarization to the synthetic resin sheet is not particularly limited. For example, (1) a flat plate electrode sandwiched between a pair of flat plate electrodes and in contact with a surface to be charged is used as a high-voltage DC power source. Connecting and grounding the other plate electrode, applying a direct current or pulsed high voltage to the synthetic resin sheet to inject charges into the synthetic resin, and imparting polarization to the synthetic resin sheet, (2) electron beam, A method of imparting polarization to a synthetic resin sheet by irradiating the surface of the synthetic resin sheet with ionizing radiation such as X-rays or ultraviolet rays to ionize air molecules in the vicinity of the synthetic resin sheet; (3) a synthetic resin sheet; A first electrode having a grounded plate electrode in a close contact state, and a needle-like electrode electrically connected to a DC high-voltage power source with a predetermined interval on the second surface side of the synthetic resin sheet or Wire An electrode is installed, corona discharge is generated by electric field concentration near the tip of the needle electrode or near the surface of the wire electrode, and air molecules are ionized to repel air ions generated by the polarity of the needle electrode or wire electrode. And a method of imparting polarization to the synthetic resin.

  A single ground electrode 2 is laminated and integrated on substantially the entire first surface 11 of the piezoelectric sheet 1. The method of laminating and integrating the ground electrode 2 on the first surface 11 of the piezoelectric sheet 1 is not particularly limited. For example, (1) the ground electrode 2 is directly deposited on the first surface 11 of the piezoelectric sheet 1. (2) A ground electrode sheet 2A in which the ground electrode 2 is laminated and integrated on the first surface of the first electrical insulating sheet 21 on the first surface 11 of the piezoelectric sheet. The method (2) is preferable because the ground electrode 2 can be laminated and integrated on the piezoelectric sheet 1 while maintaining the piezoelectricity of the piezoelectric sheet 1.

  In the present invention, the electrical insulating sheet is not particularly limited as long as it has electrical insulation, and examples thereof include a polyethylene terephthalate sheet, a polyethylene naphthalate sheet, and a polyvinyl chloride sheet.

  Examples of the method for forming the electrode on the electrical insulating sheet include (1) a method of applying and drying a conductive paste containing conductive fine particles in a binder on the electrical insulating sheet, and (2) an electrical insulating sheet. Examples include a method of forming an electrode by vapor deposition on the top, and (3) a method of stacking and integrating a metal sheet such as a copper foil or an aluminum foil as an electrode on an electrical insulating sheet.

  The ground electrode sheet 2A is laminated and integrated on the first surface 11 of the piezoelectric sheet 1 with the ground electrode 2 on the piezoelectric sheet 1 side, with a fixing agent (not shown) as necessary.

  The fixing agent is composed of a reaction system, solvent system, water system, hot melt system adhesive or pressure-sensitive adhesive, and from the viewpoint of maintaining the sensitivity of the piezoelectric sheet 1, a fixing agent having a low dielectric constant is preferable.

  A signal electrode sheet 3A is laminated and integrated on the second surface 12 of the piezoelectric sheet 1 via a fixing agent (not shown) as necessary. Since the fixing agent is the same as described above, the description thereof is omitted.

  In the signal electrode sheet 3A, a plurality of signal electrodes 3 are laminated and integrated on the first surface 31a of the second electrical insulating sheet 31 in a state of being electrically independent from each other. In the piezoelectric sensor switch A, each signal electrode 3 constitutes a sensor part B independent of each other. The size of each sensor part B and the number of sensor parts B of the piezoelectric sensor switch A are set as appropriate for each application of the piezoelectric sensor switch A. Each signal electrode 3 is formed with its size and number corresponding to the size and number of each sensor portion B of the piezoelectric sensor switch A. For example, when the piezoelectric sensor switch A is used as a keyboard, the plurality of signal electrodes 3 are arranged on the first surface 31a of the second electrical insulating sheet 31 as shown in FIG. Are arranged in the same arrangement as Each signal electrode 3 is formed corresponding to the size and shape of the corresponding key. The piezoelectric sensor switch A can also constitute a button operation part of a remote control such as a television and an audio, and a button operation part of a remote control key of an automobile. The plurality of signal electrodes 3 are arranged on the first surface 31a of the second electrical insulating sheet 31 in an arrangement similar to the arrangement of each button of the remote control or remote control key. As described above, the piezoelectric sensor switch A can suitably constitute an operation unit in which a plurality of switch units such as a keyboard key and a remote control button are arranged.

  As a method of forming the signal electrode 3 on the first surface 31a of the second electrical insulating sheet 31, the above-described method of forming an electrode on the electrical insulating sheet can be used.

  On the second surface 12 of the piezoelectric sheet 1, the signal electrode sheet 3A is laminated and integrated with the first surface 31a (the surface on which the signal electrode 3 is formed) facing the piezoelectric sheet 1. . In addition, the signal electrode sheet 3A is laminated and integrated on the second surface 12 of the piezoelectric sheet 1 via the fixing agent (not shown) as necessary.

  Further, a shield sheet 4A is laminated and integrated on the signal electrode sheet 3A so as to cover all the signal electrodes 3. The shield sheet 4A is formed by laminating and integrating a single electromagnetic wave shielding layer 4 on the first surface 41a of the third electrical insulating sheet 41. The shield sheet 4A is laminated and integrated on the signal electrode sheet 3A so that the third electrical insulating sheet 41 is on the signal electrode sheet 3A side. A shield sheet in which an electrical insulating sheet is further laminated and integrated on the electromagnetic shielding layer 4 and the electromagnetic shielding layer 4 is interposed between the two electrical insulating sheets may be used. The procedure for stacking and integrating the electromagnetic shielding layer 4 on the third electrical insulating sheet 41 is the same as the procedure for forming the electrodes on the electrical insulating sheet, and therefore the description thereof is omitted. The signal electrode 3 of the signal electrode sheet 3A is entirely covered with a single shield electrode 4. The signal electrode sheet 3A and the ground electrode 2 are electrically connected by general-purpose means such as a pierce terminal or a conductive wire. Thus, since the signal electrode 3 is covered with the shield electrode 4, it is not substantially affected by the electromagnetic wave from the outside.

  The sensor portion B is configured by the signal electrode 3, the portion 13 of the piezoelectric sheet 1 that is the projection of the signal electrode 3 in the thickness direction of the piezoelectric sheet 1, the portion 22 of the ground electrode 2, and the portion 42 of the electromagnetic wave shield layer 4. Yes. The sensor part B of the piezoelectric sensor switch A includes a signal electrode 3, a part 13 of one piezoelectric sheet, a part 22 of one ground electrode 2, and a part 42 of one shield layer. The number of piezoelectric sheets, ground electrodes, and shield layers corresponding to the number of parts B are not required, the number of parts can be reduced, the manufacturing efficiency is excellent, and the weight of the piezoelectric sensor switch A is reduced by reducing the number of parts. Can also be achieved.

  Further, a conductive line L1 is electrically connected to each signal electrode 3. Each conductive line L1 is electrically independent from the other signal electrodes 3 and the conductive lines L1 connected to the other signal electrodes 3. Accordingly, the potentials generated at each sensor portion B of the piezoelectric sensor switch A are measured independently of each other.

  The conductive line L1 connected to each signal electrode 3 is formed on the surface of the second electrical insulating sheet 31 using a known method such as screen printing. Even if the surface on which the conductive line L1 is formed is the first surface 31a (the surface on which the signal electrode 3 is formed), the second surface 31b (the surface opposite to the surface on which the signal electrode 3 is formed) Surface).

  On the other hand, as shown in FIG. 2, the conductive wire L <b> 1 is drawn to the outer peripheral edge of the second electrical insulating sheet 31. When the conductive line L1 connected to each signal electrode 3 is formed on the first surface 31a (the surface on which the signal electrode 3 is formed), it is not electrically connected to the other signal electrode 3 and the conductive line L1. Thus, it is necessary to dispose each conductive line L1. Therefore, when the number of the signal electrodes 3 is increased or when the gap between the signal electrodes 3 is narrow, it may be necessary to devise such as reducing the width of the conductive line L1.

  Therefore, it is preferable to form the conductive line L1 connected to each signal electrode 3 on the second surface 31b of the second electrical insulating sheet 31. When the conductive line L1 is formed on the second surface 31b of the second electrical insulating sheet 31, there is no need to consider an electrical short circuit with the signal electrode 3, and electrical connection between the conductive lines L1 occurs. It is sufficient to arrange the conductive wire L1 so as not to be present. Accordingly, the conductive line L1 can be easily disposed on the second surface 31b of the second electrical insulating sheet 31, and the potential generated in the piezoelectric sheet 1 can be more reliably increased by increasing the width of the conductive line L1. Can be detected.

  As shown in FIGS. 1 and 2, when the conductive line L1 connected to the signal electrode 3 is formed on the second surface 31b of the second electrical insulating sheet 31, the signal electrode 3 is formed. A through hole 31c that penetrates between the first surface 31a and the second surface 31b is formed in the two electrical insulating sheet 31 portion, and the conductive material electrically connected to the signal electrode 3 through the through hole 31c. The line L1 may be drawn and arranged on the second surface 31b of the second electrical insulating sheet 31. That is, the conductive line L1 is disposed in the through hole 31c, and the first end is electrically connected to the signal electrode 3, and the second end is on the second surface 31b of the second electrical insulating sheet 31. A first conductive line portion L11 positioned, and a second conductive member having a first end electrically connected to the first conductive line portion L11 and disposed on the second surface 31b of the second electrical insulating sheet 31. And a line portion L12.

  Further, the protective sheet 5 is laminated and integrated on the shield sheet 4A. The protective sheet 5 is laminated and integrated on the signal electrode sheet 3A through the fixing agent (not shown) as necessary. The protective sheet 5 is not particularly limited as long as it is an electrical insulating sheet.

  A sensor position display unit 51 is formed on the surface of the protective sheet 5 so as to correspond to the position of the sensor unit B (signal electrode 3). For example, when the piezoelectric sensor switch A is used as a keyboard, the sensor position display unit 51 is a display unit showing keys of the keyboard. When the piezoelectric sensor switch A is used as a button operation unit of a remote controller, the sensor position display unit 51 is a display unit showing buttons of the remote controller.

  As described above, the piezoelectric sensor switch A can be developed for various applications simply by changing the arrangement and size of the signal electrodes 3 and the display of the sensor position display unit 51 of the protective sheet 5.

  Next, an example of how to use the piezoelectric sensor switch A will be described. The piezoelectric sensor switch A has a plurality of sensor parts B, and can detect a load applied to the sensor part B independently of each other. Therefore, the piezoelectric sensor switch A can independently detect whether or not a load is applied to each of the different places.

  The piezoelectric sensor switch A is disposed on the floor or bedding, for example, detects the presence or absence of a load at each sensor portion B of the piezoelectric sensor switch A, and detects the position of a person or an object existing on the piezoelectric sensor switch A. It can be used as a sensor.

  Moreover, the piezoelectric sensor switch A can also be used as a keyboard which is an input unit, for example. When the piezoelectric sensor switch A is used as a keyboard, each sensor position display section 51 of the protective sheet 5 is assumed to display a keyboard key, and the keyboard is displayed on the entire surface of the protective sheet 5.

  The input system N can be configured using the piezoelectric sensor switch A as a keyboard as an input unit. The overall configuration of the input system N will be described. As shown in FIG. 3, the input system N includes a piezoelectric sensor switch A, measurement means C, output means D, and electronic equipment E. The measuring means C determines in which sensor part B of the piezoelectric sensor switch A a potential is generated, and outputs position information of the sensor part B where the potential is generated to the output means D. The output unit D outputs key information corresponding to the position information of the sensor unit B to the electronic device E. The electrical device E that has received the key information performs a predetermined process based on the key information.

  FIG. 4 shows a hardware configuration when each means is realized using a CPU. CPU (Central Processing Unit) 6, ROM (Read Only Memory) 7, RAM (Random Access Memory) 8, measurement module 9 such as an electrometer, SSD (Solid State Drive), HDD (Hard Disk Drive), etc. The auxiliary storage device 10 and the electronic device E are electrically connected.

  Further, a piezoelectric sensor switch A is electrically connected to the measurement module 9. Note that a general-purpose electrometer or the like is used as the measurement module 9. Each conductive line L1 electrically connected to the signal electrode 3 of the piezoelectric sensor switch A is connected to the measurement module 9 in an electrically independent state. A conductive wire (not shown) is also electrically connected to the ground electrode 2 of the piezoelectric sensor switch A. The conductive wire connected to the ground electrode 2 is branched into two on the way, and one branch wire is grounded. On the other hand, the other branch line is electrically connected to the measurement module 9. Note that the conductive wire may be electrically connected to the measurement module 9 without branching the conductive wire connected to the ground electrode 2 halfway. When a load is applied to the sensor part B of the piezoelectric sensor switch A, the piezoelectric sheet 1 part constituting the sensor part B is compressed to generate a potential. The generated potential is measured by the measurement module 9 by measuring the potential of each signal electrode 3 using the ground electrode 2 as a reference potential. The measurement modules 9 can measure the potentials generated in the respective sensor units B independently of each other. Therefore, the presence or absence of a load at each sensor portion B of the piezoelectric sensor switch A can be detected independently of each other.

  In the ROM 7, a control program executed by the CPU 6 and various data are stored. The RAM 8 stores a memory for temporarily storing setting values set based on various programs.

  Specifically, the ROM 7 stores a measurement program as measurement means. The measurement means C is realized by reading and writing data in the RAM 8 and the auxiliary storage device 10 under the control of the CPU 6 by reading the measurement program on the CPU 6 and the RAM 8. The measurement program measures the potential of each sensor part B of the piezoelectric sensor switch A by the measurement module 9 and acquires position information of the sensor part B from which the potential has been measured from the piezoelectric sensor switch A via the measurement module 9. The position information is set to be output to the output means D.

  Further, the ROM 7 stores an output program as output means. The output means D is realized by reading and writing data in the RAM 8 and the auxiliary storage device 10 under the control of the CPU 6 by reading the measurement program on the CPU 6 and the RAM 8. The output program is set to output key information (key type) corresponding to the position information of the sensor unit B received from the measurement program to the electronic device E. As shown in FIG. 5, the auxiliary storage device 10 stores the position information of the sensor unit B and the key information (key type) corresponding to the position information as a pair of information in the position key table. . For example, when the keyboard is a Japanese keyboard with a JIS layout, the position information of the sensor unit B “frontmost and left side” and key information “CTRL” key corresponding to this position information are positioned as a pair of information. Stored in the key table. Similarly, the position information of the sensor unit B “second column from the front and second from the left” and key information called “Z” key corresponding to this position information are stored in the position key table as a pair of information. Has been. In this manner, for the position information of all the sensor portions B of the piezoelectric sensor switch A, key information (key type) corresponding to the position information is stored as a pair of information in the position key table.

  The measurement program, which is a measurement means, measures the presence or absence of a potential generated in the piezoelectric sheet 1 independently for each sensor unit B via the measurement module 9, and a load is applied to any sensor unit B. Whether or not it is always detected. When the measurement program detects that a potential is generated in the piezoelectric sheet in any of the sensor parts B, the position information of the sensor part B to which a load is applied is output to the output means D as an electrical signal. .

  When receiving the position information of the sensor unit B from the measurement program, the output program which is an output means obtains key information corresponding to the position information of the sensor unit B based on the position key table stored in the auxiliary storage device 10. The key information (key type) is output to the electronic device E. Then, the electronic device E that has received the key information performs a predetermined process. For example, when the keyboard is a Japanese keyboard with a JIS layout, the sensor part on the front and the left side corresponds to the “CTRL” key on the keyboard, and is the sensor in the second row from the front and the second from the left. Is stored in the position key table as corresponding to “Z” of the keyboard. For example, in the case of “a load is applied to the sensor unit closest to the left side”, the measurement program outputs “front side and left side” as the position information. The output program receives the position information “front and left side” from the measurement program, specifies the key information “CTRL” corresponding to this position information based on the position key table, and outputs the key information to the electronic device E. . Then, the electronic device E performs a predetermined process based on the key information output from the output program.

  When the piezoelectric sheet 1 of the piezoelectric sensor switch A is a synthetic resin foam sheet, the piezoelectric sheet 1 is compressed and deformed in the thickness direction each time the sensor portion B of the piezoelectric sensor switch A is pressed. As you can see, when you press the key, you can feel the key pressing feeling, you can use it with the same feeling as a conventional keyboard, suppress the occurrence of typing mistakes, and perform accurate typing Can do.

1 Piezoelectric sheet
2A Ground electrode sheet 2 Ground electrode
3A Signal electrode sheet 3 Signal electrode 4 Protective sheet
21 First electrical insulation sheet
31 Second electrical insulation sheet
31c Through hole 4 Shield sheet
41 Shield layer 5 Protective sheet
51 Sensor position display unit 6 CPU
7 ROM
8 RAM
9 Measurement module
10 Auxiliary storage device A Piezoelectric sensor switch B Sensor unit C Measuring means D Output means E Electronic equipment
L1 conductive wire

Claims (6)

A piezoelectric sheet, a ground electrode laminated and integrated on the first surface of the piezoelectric sheet, and a signal electrode sheet laminated and integrated on the second surface of the piezoelectric sheet, the signal electrode sheet, A piezoelectric sensor switch, comprising: an electrical insulating sheet; and a plurality of signal electrodes that are electrically and independently laminated and integrated on a surface of the electrical insulating sheet that faces the piezoelectric sheet. The piezoelectric sensor switch according to claim 1, wherein the piezoelectric sheet is formed from a single sheet. Conductive wires that are electrically connected to the signal electrodes are disposed on the surface of the electrical insulating sheet of the signal electrode sheet opposite to the piezoelectric sheet, and are electrically independent from each other. The piezoelectric sensor switch according to claim 1 or 2. The piezoelectric sensor switch according to any one of claims 1 to 3, wherein the conductive wire connected to the signal electrode passes through the electrical insulating sheet of the signal electrode sheet. The piezoelectric sensor switch according to any one of claims 1 to 4, wherein the piezoelectric sheet is formed from a synthetic resin foam sheet. The piezoelectric sensor switch according to claim 5, wherein the piezoelectric sheet is a polypropylene resin foam sheet.

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