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. 09, 2007
Filed:
Nov. 20, 2006
Makoto Akiba, Saitama, JP;
Hideo Yoshida, Saitama, JP;
Makoto Akiba, Saitama, JP;
Hideo Yoshida, Saitama, JP;
Fujinon Corporation, Tokyo, JP;
Abstract
A driving control devicecontrols supply of driving pulses to expand and contract a piezoelectric elementso that an expansion rate is different from a contraction rate, to vibrate a driving rodand move a lensfrictionally engaging with the driving rodin two directions. The driving control deviceincludes an actual driving pulse number measuring unitthat measures actual driving pulse numbers, which are required to move the lensby a predetermined movement amount in the two directions, before a focusing operation of the lens, a correction factor calculating unitthat calculates correction factors relating to a driving pulse number, based on the actual driving pulse numbers and a predetermined reference pulse number; and a driving pulse number correcting unitthat corrects a driving pulse number supplied to the piezoelectric elementbased on the correction factors.