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:
Oct. 22, 2013
Filed:
Sep. 28, 2010
Takamichi Fujii, Ashigarakami-gun, JP;
Yoshikazu Hishinuma, Ashigarakami-gun, JP;
Yoshinori Katoh, Ashigarakami-gun, JP;
Takami Arakawa, Ashigarakami-gun, JP;
Takayuki Naono, Ashigarakami-gun, JP;
Takamichi Fujii, Ashigarakami-gun, JP;
Yoshikazu Hishinuma, Ashigarakami-gun, JP;
Yoshinori Katoh, Ashigarakami-gun, JP;
Takami Arakawa, Ashigarakami-gun, JP;
Takayuki Naono, Ashigarakami-gun, JP;
FUJIFILM Corporation, Tokyo, JP;
Abstract
A method of driving a piezoelectric actuator including: a piezoelectric element containing a piezoelectric body having coercive field points on a negative field side and a positive field side respectively and having asymmetrical bipolar polarization—electric field hysteresis characteristics in which an absolute value of a coercive electric field on the negative field side and a coercive electric field value on the positive field side are mutually different, and a pair of electrodes for applying voltage to the piezoelectric body; and a diaphragm which externally transmits, as displacement, distortion produced in the piezoelectric body when the voltage is applied to the piezoelectric body, includes the step of driving the piezoelectric actuator between a positive drive voltage and a negative drive voltage in a range not exceeding the coercive electric field, from among the positive and negative coercive electric fields, which has the larger absolute value.