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:
Jul. 23, 2013
Filed:
Jan. 03, 2011
Applicants:
Jiro Kato, Suwa, JP;
Satoshi Denda, Suwa, JP;
Yoko Miyazawa, Shimosuwa-machi, JP;
Inventors:
Assignee:
Seiko Epson Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B41J 2/045 (2006.01); H01L 41/04 (2006.01);
U.S. Cl.
CPC ...
Abstract
A piezoelectric element comprising a first electrode, a piezoelectric layer which contains lead, zirconium, and titanium, and which is formed above the first electrode, and a second electrode formed above the piezoelectric layer. A groove which exists between grains in the second electrode side surface of the piezoelectric layer, satisfies 0≦d/ρ≦0.900 (where d: depth of groove, w: width of groove, ρ: radius of curvature (d+w/4)/2d).