# US 10,770,644 B2 · Piezoelectric device

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- Number: US 10,770,644 B2
- Document ID: US10770644B2
- Status: Granted
- Kind: B2
- Application number: 15/646,160
- Filed: 2017-07-11
- Published: 2017-11-02
- Granted: 2020-09-08
- Earliest claimed: 2015-01-21
- Assignees: Alps Alpine Co., Ltd.
- Applicants: Alps Alpine Co., Ltd.
- Inventors: Heishiro Fudo; Yasuji Hagiwara; Daisuke Takai; Shoji Sakurai; Masahiro Ishida; Yo Tahara
- Web page: https://patentgrep.com/patent/US10770644B2

## CPC

- H10N 30/302: {Sensors}
- H10N 30/074: by depositing piezoelectric or electrostrictive layers, e.g. aerosol or screen printing
- H10N 30/08: Shaping or machining of piezoelectric or electrostrictive bodies
- H10N 30/084: by moulding or extrusion
- H10N 30/092: Forming composite materials
- H10N 30/308: {Membrane type}
- H10N 30/704: {based on piezoelectric or electrostrictive films or coatings}
- H10N 30/706: {characterised by the underlying bases, e.g. substrates}
- H10N 30/852: {Composite materials, e.g. having 1-3 or 2-2 type connectivity}
- H10N 30/87: Electrodes or interconnections, e.g. leads or terminals
- H10N 30/877: {Conductive materials}
- H10N 30/878: {the principal material being non-metallic, e.g. oxide or carbon based}
- H10N 30/883: {Additional insulation means preventing electrical, physical or chemical damage, e.g. protective coatings}
- H10N: ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR

## Abstract

A piezoelectric device includes a substrate that is flexible and thermally deformable, and a composite piezoelectric body disposed on the substrate. Output in accordance with deformation of the composite piezoelectric body is obtained. The composite piezoelectric body includes a piezoelectric layer containing an organic binder containing piezoelectric particles, a first electrode layer stacked on a first surface side of the piezoelectric layer, and a second electrode stacked on a second surface side of the piezoelectric layer. The substrate is insert molded and integrated with a molded resin body having a curved shape.

## Claims

### Claim 1

A piezoelectric device producing output according to deformation of a composite piezoelectric body, the piezoelectric device comprising:
a substrate that is flexible and thermally deformable; and
a composite piezoelectric body disposed on the substrate, the composite piezoelectric body including:
a piezoelectric layer containing an organic binder and piezoelectric particles,
a first electrode layer stacked on a first surface side of the piezoelectric layer, and
a second electrode layer stacked on a second surface side of the piezoelectric layer,
wherein the substrate is insert molded and integrated with a molded resin body having a curved shape;
the substrate is formed of a thermoplastic resin;
the organic binder is formed of a thermoplastic resin;
the first electrode layer contains a first binder resin which is a thermoplastic resin, and first conductive particles dispersed in the first binder resin;
the second electrode layer contains a second binder resin which is a thermoplastic resin, and a second conductive particles dispersed in the second binder resin; and
the organic binder has a melt viscosity at 250° C. of 300 Pa·s or more.

### Claim 2 (depends on 1)

The piezoelectric device according to claim 1, wherein the piezoelectric particles are formed of a polarized ferroelectric and have a Curie temperature of 250° C. or higher.

### Claim 3 (depends on 2)

The piezoelectric device according to claim 2, wherein the piezoelectric particles have a Curie temperature of 375° C. or higher.

### Claim 4 (depends on 1)

The piezoelectric device according to claim 1, wherein:
the substrate provided with the composite piezoelectric body is heated and pressurized to be deformed into a curved shape prior to the insert molding; and
the organic binder has a storage elastic modulus at 140° C. of 1 MPa or more and a loss elastic modulus of 0.1 MPa or more.

### Claim 5 (depends on 1)

The piezoelectric device according to claim 1, wherein a maximum height (Ry) of surface roughness of the first electrode layer and the second electrode layer is one half of the thickness of the piezoelectric layer or less.

### Claim 6 (depends on 1)

The piezoelectric device according to claim 1, wherein the piezoelectric particles are formed of potassium niobate.

### Claim 7

A piezoelectric device producing output according to deformation of a composite piezoelectric body, the piezoelectric device comprising:
a substrate that is flexible and thermally deformable; and
a composite piezoelectric body disposed on the substrate, the composite piezoelectric body including:
a piezoelectric layer containing an organic binder and piezoelectric particles,
a first electrode layer stacked on a first surface side of the piezoelectric layer, and
a second electrode layer stacked on a second surface side of the piezoelectric layer,
wherein the substrate is insert molded and integrated with a molded resin body having a curved shape;
the substrate and the molded resin body are integrated at a second surface side opposite to a first surface side of the substrate provided with the composite piezoelectric body; and
an overcoat layer formed of a thermoplastic resin is provided on the first surface side of the substrate so as to cover the composite piezoelectric body.