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:
Oct. 20, 2020
Filed:
May. 23, 2018
Canon Kabushiki Kaisha, Tokyo, JP;
Makoto Kubota, Yokohama, JP;
Jumpei Hayashi, Yokohama, JP;
Tatsuo Furuta, Machida, JP;
Kanako Oshima, Tokyo, JP;
Shinya Koyama, Tokyo, JP;
CANON KABUSHIKI KAISHA, Tokyo, JP;
Abstract
A piezoelectric element, in which a piezoelectric material layer has a plurality of crystal particles and a plurality of void portions and, in at least one of two or more of the piezoelectric material layers, when the average thickness in the lamination direction of the piezoelectric material layer is defined as T, the average circle-equivalent diameter of the plurality of crystal particles is defined as D, the maximum length in the lamination direction of the plurality of void portions not contacting the electrode layers is defined as L, and the average thickness of the electrode layers contacting the at least one piezoelectric material layer is defined as T, 0.07T≤D≤0.33Tand T≤L≤0.3Tare established and the lead content is less than 1000 ppm.