US 12,356,863 B2
Piezoelectric element
Yoshiki Ohta, Tokyo (JP); Jun Sugawara, Tokyo (JP); Kenichiro Andou, Tokyo (JP); Nana Sato, Tokyo (JP); and Akihiro Takeda, Tokyo (JP)
Assigned to TDK CORPORATION, Tokyo (JP)
Appl. No. 17/615,574
Filed by TDK CORPORATION, Tokyo (JP)
PCT Filed May 25, 2020, PCT No. PCT/JP2020/020588
§ 371(c)(1), (2) Date Nov. 30, 2021,
PCT Pub. No. WO2020/250657, PCT Pub. Date Dec. 17, 2020.
Claims priority of application No. JP2019-110979 (JP), filed on Jun. 14, 2019.
Prior Publication US 2022/0352454 A1, Nov. 3, 2022
Int. Cl. H01L 41/047 (2006.01); H10N 30/30 (2023.01); H10N 30/87 (2023.01); H10N 30/045 (2023.01)
CPC H10N 30/87 (2023.02) [H10N 30/302 (2023.02); H10N 30/045 (2023.02)] 11 Claims
OG exemplary drawing
 
1. A piezoelectric element comprising:
a piezoelectric body including a piezoelectric material; and
a first electrode and a second electrode provided on the piezoelectric body,
wherein the piezoelectric body includes:
a base including a first main surface and a second main surface opposing each other; and
a plurality of drivers arranged on the first main surface in such a way as to be separate from each other, each of the plurality of drivers including a third main surface contacting the first main surface and a fourth main surface opposing the third main surface,
wherein the base includes a plurality of first regions in which the plurality of drivers is provided and a second region provided between the first regions adjacent to each other, and
the base is curved,
wherein the second region includes a first end portion close to the first main surface and a second end portion close to the second main surface, and
a polarization degree in the first end portion is different from a polarization degree in the second end portion.