# US 2021/0280770 A1 · Piezoelectric sensor

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- Number: US 2021/0280770 A1
- Document ID: US20210280770A1
- Status: Published application
- Kind: A1
- Application number: 16/330,424
- Filed: 2017-09-06
- Published: 2021-09-09
- Earliest claimed: 2016-09-06
- Assignees: Sekisui Chemical Co., Ltd.
- Applicants: Sekisui Chemical Co., Ltd.
- Inventors: Nobuto KAMIYA; Tetsuhiro KATO; Yuuta KATSURAYAMA; Kazuyoshi IWANE
- Web page: https://patentgrep.com/patent/US20210280770A1

## CPC

- G01B 7/16: for measuring the deformation in a solid, e.g. by resistance strain gauge
- H10N 30/302: {Sensors}
- G01L 1/16: using properties of piezoelectric devices
- H10N 30/50: having a stacked or multilayer structure
- H10N 30/857: Macromolecular compositions
- H10N 30/871: {Single-layered electrodes of multilayer piezoelectric or electrostrictive devices, e.g. internal electrodes}
- H10N 30/878: {the principal material being non-metallic, e.g. oxide or carbon based}
- G01B: MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- H10N: ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- G01L: MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE (weighing G01G)

## Abstract

The present invention provides a piezoelectric sensor that has elastic properties in a surface direction thereof, and can smoothly follow stretching of a body to be measured to accurately measure movement of the body to be measured, and detect movement in a surface direction of a surface of the body to be measured on which the piezoelectric sensor is disposed. The piezoelectric sensor of the present invention includes: a piezoelectric sheet including a porous synthetic resin sheet; a signal electrode layer that is layered on a surface of the piezoelectric sheet and contains conductive fine particles and a binder resin having elastic properties; and a ground electrode layer that is layered on another surface of the piezoelectric sheet and contains conductive fine particles and a binder resin having elastic properties.

## Claims

### Claim 1

A piezoelectric sensor comprising: a piezoelectric sheet including a porous synthetic resin sheet; a signal electrode layer that is layered on a surface of the piezoelectric sheet and contains conductive fine particles and a binder resin having elastic properties; and a ground electrode layer that is layered on another surface of the piezoelectric sheet and contains conductive fine particles and a binder resin having elastic properties.

### Claim 2 (depends on 1)

The piezoelectric sensor according to claim 1, wherein the signal electrode layer and/or the ground electrode layer are/is supported by an elastic synthetic resin sheet.

### Claim 3 (depends on 1)

The piezoelectric sensor according to claim 1, wherein the elastic synthetic resin sheet includes any of a thermoplastic elastomer sheet and a rubber sheet.

### Claim 4 (depends on 2)

The piezoelectric sensor according to claim 2, wherein the elastic synthetic resin sheet includes any of a thermoplastic elastomer sheet and a rubber sheet.