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:
Mar. 03, 2020
Filed:
Dec. 12, 2018
Applicant:
Seiko Epson Corporation, Tokyo, JP;
Inventors:
Koji Sumi, Shiojiri, JP;
Harunobu Koike, Chino, JP;
Toshiaki Takahashi, Chino, JP;
Koichi Morozumi, Shiojiri, JP;
Assignee:
Seiko Epson Corporation, , JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01L 41/047 (2006.01); B41J 2/14 (2006.01); H01L 41/29 (2013.01); H01L 41/318 (2013.01); H01L 41/187 (2006.01);
U.S. Cl.
CPC ...
H01L 41/0477 (2013.01); B41J 2/14233 (2013.01); H01L 41/1873 (2013.01); H01L 41/29 (2013.01); H01L 41/318 (2013.01); B41J 2002/14241 (2013.01); B41J 2002/14419 (2013.01);
Abstract
A piezoelectric element includes: a first electrode containing crystal grains; a piezoelectric layer which contains potassium, sodium, and niobium and which is provided above the first electrode; and a second electrode provided above the piezoelectric layer, and the average grain diameter of the crystal grains is less than 550 nm.