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. 04, 2017
Filed:
Feb. 10, 2014
Tdk Corporation, Tokyo, JP;
Yuiko Hirose, Tokyo, JP;
Yasuhiro Aida, Tokyo, JP;
TDK CORPORATION, Tokyo, JP;
Abstract
A piezoelectric device is provided with a piezoelectric element including a piezoelectric layer exhibiting a polarizability γ smaller than 1×10(C/(V·m)) in the case where an electric field is applied until polarization is saturated and a circuit having a means to set a minimum value of a drive electric field to become larger than a positive coercive electric field of the above-described piezoelectric layer and a means to set a maximum value of the above-described drive electric field to become smaller than (Pm'(maximum value of polarization)−Pr′(quasi-remanent polarization))/(1×10) and, therefore, an object is to drive the piezoelectric element in an electric field range in which maximum piezoelectric characteristics are obtained, improve the characteristics of the piezoelectric device, and enhance the reliability.