US 12,389,802 B2
Piezoelectric actuator
Wataru Kuroda, Kirishima (JP)
Assigned to KYOCERA Corporation, Kyoto (JP)
Appl. No. 17/629,972
Filed by KYOCERA Corporation, Kyoto (JP)
PCT Filed Jul. 16, 2020, PCT No. PCT/JP2020/027725
§ 371(c)(1), (2) Date Jan. 25, 2022,
PCT Pub. No. WO2021/044744, PCT Pub. Date Mar. 11, 2021.
Claims priority of application No. 2019-161546 (JP), filed on Sep. 4, 2019.
Prior Publication US 2022/0254981 A1, Aug. 11, 2022
Int. Cl. H10N 30/88 (2023.01); H10N 30/20 (2023.01); H10N 30/50 (2023.01); H10N 30/87 (2023.01)
CPC H10N 30/886 (2023.02) [H10N 30/204 (2023.02); H10N 30/50 (2023.02); H10N 30/871 (2023.02)] 12 Claims
OG exemplary drawing
 
1. A piezoelectric actuator, comprising:
a piezoelectric element; and
a case accommodating the piezoelectric element, the case being deformable to conform with expansion or contraction of the piezoelectric element, the case including
a cylinder including a first end portion being open, and
a first cap including a first end plate being circular and a first protrusion being annular, the first protrusion being located on a first surface of the first end plate and protruding perpendicularly to the first surface,
wherein the cylinder includes the first end portion receiving the first protrusion on the first cap, the first end portion includes an inner peripheral surface joined to an outer peripheral surface of the first protrusion, and
wherein an edge of the first end portion is located nearer to an edge of the first protrusion than to the first surface of the first end plate in an axial direction of the cylinder.