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. 31, 2021
Filed:
Sep. 26, 2019
Seiko Epson Corporation, Tokyo, JP;
Kazuya Kitada, Matsumoto, JP;
Tsutomu Asakawa, Shiojiri, JP;
Abstract
A piezoelectric element including a first electrode provided above a base body, a first piezoelectric layer provided so as to be in contact with the base body and cover the first electrode, a second piezoelectric layer provided above the first piezoelectric layer, and a second electrode provided above the second piezoelectric layer, wherein the first piezoelectric layer includes a composite oxide that contains potassium and niobium and that has a perovskite-type structure containing potassium as a main component at an A-site, the second piezoelectric layer includes a composite oxide that contains potassium, sodium, and niobium and that has a perovskite-type structure, and the first piezoelectric layer has a higher potassium atomic concentration (atm %) than the second piezoelectric layer.