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. 25, 2014
Filed:
Mar. 23, 2011
Masao Nakayama, Shiojiri, JP;
Hideki Hahiro, Shiojiri, JP;
Masao Nakayama, Shiojiri, JP;
Hideki Hahiro, Shiojiri, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
A piezoelectric element includes a first electrode, a second electrode, and a piezoelectric layer between the first electrode and the second electrode. The first electrode includes a first electroconductive layer having a first surface at the piezoelectric layer side and a second electroconductive layer having a second surface at the first surface side. The second electroconductive layer mainly contains lanthanum nickelate and is disposed on the first surface. The first electrode, the piezoelectric layer and the second electrode overlap with each other when viewed in the direction of the normal to the first surface to form an overlap portion acting as a driving portion. At least part of the second electroconductive layer is disposed within the sides of the first surface within the driving portion, and the second surface has a smaller area than the first surface within the driving portion.