Piezoelectric actuator

Patent metadata

Field	Value
Publication number	US-2023371390-A1
Application number	US-202118029281-A
Country	US
Kind code	A1
Filing date	Aug 18, 2021
Priority date	Sep 30, 2020
Publication date	Nov 16, 2023
Grant date	—

Abstract

A piezoelectric actuator includes a piezoelectric element layered in a pillar shape, and electrode plates located on side surfaces of the piezoelectric element and electrically connected to internal electrode layers of the piezoelectric element. Each of the electrode plates includes a body portion extending in a layering direction of the piezoelectric element and a lead portion that extends in a direction intersecting the layering direction and is electrically connected to a lead terminal. The lead portion includes, in at least one side portion, a recessed portion recessed in a width direction of the lead portion.

First claim

1 . A piezoelectric actuator comprising:
a piezoelectric element layered in a pillar shape, the piezoelectric element including an internal electrode layer; and an electrode plate located on a side surface of the piezoelectric element and being electrically connected to the internal electrode layer of the piezoelectric element, the electrode plate comprising:
a body portion extending in a layering direction of the piezoelectric element; and
a lead portion extending in a direction intersecting the layering direction and being electrically connected to a lead terminal, the lead portion comprising, in at least one side portion thereof, a recessed portion recessed in a width direction of the lead portion.

2 . The piezoelectric actuator according to claim 1 , wherein
the recessed portion is disposed closer to a base end portion of the lead portion than to a distal end portion of the lead portion.

3 . The piezoelectric actuator according to claim 1 , wherein
the lead portion comprises the recessed portion in a pair of side portions.

4 . The piezoelectric actuator according to claim 3 , wherein
the recessed portions located in the pair of side portions of the lead portion are located facing each other.

5 . The piezoelectric actuator according to claim 3 , wherein
the recessed portion comprises a recessed portion located in a side portion of the piezoelectric element on a base end portion side and a recessed portion located in a side portion of the piezoelectric element on a distal end portion side, and the recessed portion on the base end portion side is deeper than the recessed portion on the distal end portion side.

6 . The piezoelectric actuator according to claim 1 , wherein
the recessed portion is substantially V-shaped.

7 . The piezoelectric actuator according to claim 1 , wherein
a bottom portion of the recessed portion has a round shape.

8 . The piezoelectric actuator according to claim 1 , wherein
the lead portion comprises, in the at least one side portion thereof, a plurality of recessed portions, and the at least one side portion comprises a site where a plating film is not formed in a region between adjacent recessed portions of the plurality of recessed portions.

9 . The piezoelectric actuator according to claim 1 , wherein
the lead portion comprises a plurality of bent portions and a hole portion through which the lead terminal is inserted, and among the plurality of bent portions, a bent portion located around the hole portion comprises a through hole.

Assignees

• Kyocera Corp

Inventors

• Tanaka Kazuki

Classifications

• H10N30/508 Primary

  adapted for alleviating internal stress, e.g. cracking control layers · CPC title

• H10N30/871

  Single-layered electrodes of multilayer piezoelectric or electrostrictive devices, e.g. internal electrodes · CPC title

• H10N30/872

  Interconnections, e.g. connection electrodes of multilayer piezoelectric or electrostrictive devices · CPC title

• H10N30/875

  Further connection or lead arrangements, e.g. flexible wiring boards, terminal pins · CPC title

• H10N30/206

  using only longitudinal or thickness displacement, e.g. d33 or d31 type devices · CPC title