# US 10,309,844 B2 · Press detecting sensor

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- Number: US 10,309,844 B2
- Document ID: US10309844B2
- Status: Granted
- Kind: B2
- Application number: 15/052,149
- Filed: 2016-02-24
- Published: 2016-06-16
- Granted: 2019-06-04
- Earliest claimed: 2013-09-20
- Assignees: Murata Manufacturing Co., Ltd.
- Applicants: Murata Manufacturing Co., Ltd.
- Inventors: Hideki Kawamura
- Web page: https://patentgrep.com/patent/US10309844B2

## CPC

- G01L 1/16: using properties of piezoelectric devices
- C09J 133/00: Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
- C09J 201/00: Adhesives based on unspecified macromolecular compounds
- G01L: MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE (weighing G01G)
- C09J: ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES (preparation of glue or gelatine C09H)

## Abstract

A press detecting sensor that includes an operation receiving member and a piezoelectric sensor. The operation receiving member is a multilayer rigid plate including a cover glass, a touch sensor and a display panel fixed via first bonding agents. The piezoelectric sensor includes a piezoelectric film, a first detecting member on a surface at a side of the operation receiving member of the piezoelectric film, and a second detecting member on a surface at a side opposite to the operation receiving member. The first detecting member is bonded to the operation receiving member by an adhesive member, and is bonded to the piezoelectric film by a second bonding agent.

## Claims

### Claim 1

A press detecting sensor comprising:
an operation receiving member having a plurality of plates laminated and bonded together with a first bonding agent, the operation receiving member having a first principal surface that is orthogonal to a laminating direction and a second principal surface opposite the first principal surface;
a piezoelectric sensor disposed at a side of the second principal surface of the operation receiving member, and positioned such that a stress from the operation receiving member is transmitted to the piezoelectric sensor, wherein
the piezoelectric sensor includes:
a piezoelectric film having opposed first and second principal surfaces;
a first detection electrode on the first principal surface of the piezoelectric film;
a second detection electrode on the second principal surface of the piezoelectric film; and
of the first and second detection electrodes, the detection electrode at a side of the operation receiving member is bonded to the piezoelectric film by a second bonding agent; and
an adhesive member which adheres the operation receiving member and the piezoelectric sensor to each other, wherein an elastic modulus of the adhesive member is higher than that of an elastic modulus of the first bonding agent and the second bonding agent.

### Claim 2 (depends on 1)

The press detecting sensor according to claim 1, wherein the piezoelectric sensor is bonded to the second principal surface of the operation receiving member.

### Claim 3 (depends on 1)

The press detecting sensor according to claim 1, wherein the first bonding agent and the second bonding agent are an acrylic bonding agent.

### Claim 4 (depends on 3)

The press detecting sensor according to claim 3, wherein the elastic modulus of the first bonding agent and the second bonding agent is between 104 to 106 Pa at 25° C.

### Claim 5 (depends on 1)

The press detecting sensor according to claim 1, wherein the piezoelectric film includes polylactic acid.

### Claim 6 (depends on 1)

The press detecting sensor according to claim 1, wherein the plurality of plates of the operation receiving member include:
a glass plate having a first surface that defines the first principal surface of the operation receiving member and a second surface opposite the first surface; and
a position detecting sensor disposed at a side of the second surface of the glass plate.

### Claim 7 (depends on 6)

The press detecting sensor according to claim 6, wherein the plurality of plates of the operation receiving member further include a display panel disposed at a side of the position detecting sensor such that the position detecting sensor is between the glass plate and the display panel.

### Claim 8 (depends on 1)

The press detecting sensor according to claim 1, wherein the elastic modulus of the first bonding agent and the second bonding agent is between 104 to 106 Pa at 25° C.

### Claim 9 (depends on 1)

The press detecting sensor according to claim 1, wherein the elastic modulus of the first bonding agent and the second bonding agent at room temperature is smaller than the elastic modulus of the adhesive member at a temperature lower than room temperature.