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:
Feb. 19, 2013
Filed:
Mar. 23, 2010
Hideki Shimizu, Ohbu, JP;
Takao Ohnishi, Niwa-Gun, JP;
Takashi Ebigase, Nagoya, JP;
Naoki Goto, Ogaki, JP;
Hideki Shimizu, Ohbu, JP;
Takao Ohnishi, Niwa-Gun, JP;
Takashi Ebigase, Nagoya, JP;
Naoki Goto, Ogaki, JP;
NGK Insulators, Ltd., Nagoya, JP;
Abstract
There is provided a method for manufacturing a piezoelectric actuator where the planar shape is adjusted by subjecting the piezoelectric body layer located on one of the outer surfaces in the two or more piezoelectric body layers to a polarization treatment to control remnant polarization of the piezoelectric body layer. The piezoelectric actuator is used as a drive portion of a piezoelectric drive type variable capacitor. The variable capacitor has high mechanical strength and excellent reliability for a long period of time. The relation between the displacement amount of the piezoelectric actuator and the capacity of the capacitor is stable, and the variable capacity is wide.