The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 03, 2021
Filed:
Jul. 06, 2018
Applicant:
Canon Kabushiki Kaisha, Tokyo, JP;
Inventors:
Jumpei Hayashi, Yokohama, JP;
Makoto Kubota, Yokohama, JP;
Shinya Koyama, Tokyo, JP;
Tatsuo Furuta, Machida, JP;
Kanako Oshima, Tokyo, JP;
Assignee:
CANON KABUSHIKI KAISHA, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B 7/04 (2021.01); H01L 41/083 (2006.01); H01L 41/187 (2006.01); H01L 41/257 (2013.01); H01L 41/297 (2013.01); H01L 41/273 (2013.01); H02N 2/10 (2006.01); H01L 41/047 (2006.01); H02N 2/00 (2006.01); G02B 7/08 (2021.01);
U.S. Cl.
CPC ...
H01L 41/1871 (2013.01); G02B 7/04 (2013.01); G02B 7/08 (2013.01); H01L 41/0471 (2013.01); H01L 41/0835 (2013.01); H01L 41/257 (2013.01); H01L 41/273 (2013.01); H01L 41/297 (2013.01); H02N 2/103 (2013.01); H02N 2/106 (2013.01); H02N 2/22 (2013.01);
Abstract
A piezoelectric element includes a piezoelectric material layer and an electrode layer, wherein the piezoelectric material layer and the electrode layer are stacked on top of each other, the piezoelectric material layer includes a barium titanate-based material, and two coercive fields Ecand Ecof the piezoelectric element have the same sign and satisfy (|EcEc|)≥8 kV/cm.