US 10,897,004 B2Granted

Piezoelectric drive device

AssigneeTDK Corporation

InventorsMitsunao Homma, Masahiro Hosokawa

Life of this patent

Estimating the term…

Loading patent…

Abstract

A piezoelectric drive device including: laminated piezoelectric element including a first end face and a second end face opposed to the first end face; a weight member attached to the first end face; and a shaft attached to the second end face, in which a moving member, engaged to the shaft movable in an axial direction, is moved by activating the laminated piezoelectric element. Inside the laminated piezoelectric element, a first internal electrode and a second internal electrode, respectively having a plane surface approximately perpendicular to the first end face and the second end face, are laminated in Y axial direction, approximately perpendicular to the first internal electrode and the second internal electrode with a piezoelectric layer in-between. The piezoelectric drive device, in which the laminated piezoelectric element is difficult to bend, even when the load is applied to the shaft from a lateral direction, is provided.

Claims17

Dependent claims

A piezoelectric drive device comprising:

a laminated piezoelectric element comprising a first end face and a second end face opposed to the first end face;
a weight member attached to the first end face of the laminated piezoelectric element;
and
a shaft attached to the second end face of the laminated piezoelectric element,
wherein a moving member, engaged to a shaft movable in an axial direction, is moved in the axial direction by activating the laminated piezoelectric element,
a first internal electrode and a second internal electrode, respectively having a plane surface which is approximately perpendicular to the first end face and the second end face, are laminated in a direction approximately perpendicular to the first internal electrode and the second internal electrode with a piezoelectric layer in-between, inside the laminated piezoelectric element, and
a length of the laminated piezoelectric element corresponding to a distance between the first end face and the second end face is longer than a thickness of the laminated piezoelectric element in the laminated direction along the direction approximately perpendicular to the first internal electrode and the second internal electrode.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/695,485Filed 5 Sep 2017
Priority: JP 2016-1771179 Sep 2016
Published: US 2018/0076380 A115 Mar 2018
Granted: 19 Jan 2021
Term ends: Not estimatedThe source records don’t support an estimate.

Classification15 codes

H10N 30/20
Piezoelectric or electrostrictive devices: with electrical input and mechanical output, e.g. functioning as actuators or vibrators
H02N 2/002
Driving devices, e.g. vibrators: using only longitudinal or radial modes
H02N 2/025
Using intermittent driving, e.g. step motors, piezoleg motors: inertial sliding motors
H10N 30/50
Piezoelectric or electrostrictive devices: having a stacked or multilayer structure