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:
Apr. 03, 2012
Filed:
Nov. 03, 2009
Akira Kuriki, Suwa, JP;
Koji Sumi, Suwa, JP;
Tatsuo Sawasaki, Suwa, JP;
Tatsuro Torimoto, Suwa, JP;
Motoki Takabe, Suwa, JP;
Akira Kuriki, Suwa, JP;
Koji Sumi, Suwa, JP;
Tatsuo Sawasaki, Suwa, JP;
Tatsuro Torimoto, Suwa, JP;
Motoki Takabe, Suwa, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
A piezoelectric element includes a piezoelectric film containing lead (Pb), zirconium (Zr), and titanium (Ti). The piezoelectric film has a composition satisfying the relationship of Zr/(Ti+Zr)>Ti/(Ti+Zr) and has a polarization-electric field hysteresis loop having a Pm/2Pr of 1.95 or more and a Vc(−) of −1.75 V or more, wherein Pm denotes saturation polarization, Pr denotes remanent polarization, and Vc(−) denotes a negative coercive electric field intensity.