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:
Dec. 16, 2003
Filed:
Jun. 11, 2002
Takashi Yamamoto, Chiryu, JP;
Youta Iwamoto, Inabe-gun, JP;
Denso Corporation, Aichi-Pref., JP;
Abstract
This invention provides a piezoelectric actuator exhibiting a small change of displacement even when ranges of use conditions such as a temperature, an electric field and a compressive stress are broad, and a driving method of the piezoelectric actuator. In the piezoelectric actuator using a piezoelectric body undergoing displacement upon application of a voltage, a crystalline structure of the piezoelectric body substantially exists on a tetragonal system side outside of a morphotropic phase boundary (MPB) between the tetragonal system and a rhombohedral system under conditions of the lowest temperature, the lowest electric field and the maximum compressive stress that are used.