Stacked piezoelectric actuator with through-hole connection electrodes

Patent metadata

Field	Value
Publication number	US-12580498-B2
Application number	US-202217848874-A
Country	US
Kind code	B2
Filing date	Jun 24, 2022
Priority date	Jul 9, 2021
Publication date	Mar 17, 2026
Grant date	Mar 17, 2026

Abstract

Provided is a piezoelectric actuator, a linear driving device, and an electronic device that achieve displacement of a drive shaft of a given magnitude even in a case where a low voltage is applied. A piezoelectric actuator includes a piezoelectric material composed of a stack of plate-shaped piezoelectric elements, the piezoelectric material being expandable and contractable in a direction of a plate surface thereof; an elastic plate having the piezoelectric material formed on a plate surface of the elastic plate, and a drive shaft having one end fixed to either the piezoelectric material or the elastic plate in a direction perpendicular to the plate surface of the piezoelectric material.

First claim

The invention claimed is:

1 . A piezoelectric actuator comprising:
a piezoelectric material composed of a stack of plate-shaped piezoelectric elements and being expandable and contractable in a direction of a plate surface thereof; an elastic plate having the piezoelectric material formed on a plate surface of the elastic plate; and a drive shaft having one end fixed to either the piezoelectric material or the elastic plate in a direction perpendicular to the plate surface of the piezoelectric material, wherein each of the plate-shaped piezoelectric elements includes:
a piezoelectric element body; and
electrode layers placed across the plate-shaped piezoelectric element body and being supplied with applied voltages that are different from each other,
and wherein two through-holes are formed in the plurality of plate-shaped piezoelectric elements, and connection electrodes are provided in the respective through-holes such that an odd numbered electrode layer is connected to one of the connection electrodes, and an even numbered electrode layer is connected to another of the connection electrodes.

2 . The piezoelectric actuator according to claim 1 , wherein the piezoelectric material is formed on each of both plate surfaces of the elastic plate.

3 . The piezoelectric actuator according to claim 2 , wherein an odd number of the plate-shaped piezoelectric elements are stacked.

4 . The piezoelectric actuator according to claim 1 , wherein the one connection electrode and the even numbered electrode layer are formed so as to be isolated from each other, and the other connection electrode and the odd numbered electrode layer are formed so as to be isolated from each other.

5 . The piezoelectric actuator according to claim 1 , wherein an odd number of the plate-shaped piezoelectric elements are stacked.

6 . A linear driving device comprising the piezoelectric actuator according to claim 1 .

7 . An electronic device comprising the linear driving device according to claim 6 .

Assignees

• New Shicoh Motor Co Ltd

Inventors

• Onodera Kei
• Yano Tomoyoshi

Classifications

• H10N30/874 Primary

  embedded within piezoelectric or electrostrictive material, e.g. via connections · CPC title

• H10N30/506

  having a cylindrical shape and having stacking in the radial direction, e.g. coaxial or spiral type rolls · CPC title

• H02N2/026 Primary

  by pressing one or more vibrators against the driven body · CPC title