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. 07, 2008
Filed:
Sep. 21, 2005
Yoshihiro Ito, Saitama, JP;
Yoji Naka, Saitama, JP;
Takehiko Senba, Saitama, JP;
Haruo Onozuka, Saitama, JP;
Yukio Noguchi, Saitama, JP;
Mitsuo Manabe, Saitama, JP;
Yoshihiro Ito, Saitama, JP;
Yoji Naka, Saitama, JP;
Takehiko Senba, Saitama, JP;
Haruo Onozuka, Saitama, JP;
Yukio Noguchi, Saitama, JP;
Mitsuo Manabe, Saitama, JP;
Fujinon Corporation, Saitama, JP;
FUJIFILM Corporation, Tokyo, JP;
Abstract
A piezoelectric actuator having a frame portion includes a drive shaft for frictional engagement with an engageable barrel arm of a lens unit. First and second piezoelectric elements are supported on the frame portion, and provided with first and second ends of respectively the drive shaft. A drive pulse generator supplies the piezoelectric elements with a drive signal to expand or contract the piezoelectric elements, and moves the engageable barrel arm in an axial direction by an alternately repeating sequence of shifting the drive shaft at low and high speeds in the axial direction. In the shifting at the high speed, the piezoelectric elements shift the drive shaft in a backward direction quickly, to move the drive shaft in the backward direction relative to the engageable barrel arm being stationary with inertial force.