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:
Sep. 09, 2008
Filed:
Aug. 13, 2007
Shuya Tanaka, Kawasaki, JP;
Shuya Tanaka, Kawasaki, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A vibration wave motor control apparatus which has a simplified construction and is reduced in cost. In a photographic apparatus including a lens, a lens position controller controls the position of the lens using a vibration wave motor driven by a drive voltage of a set frequency, and a drive-frequency controller controls the set frequency. The drive-frequency controller determines an estimated frequency based on a change in the position of a movable unit of the vibration wave motor determined from data inputted from an encoder, and based on the estimated frequency, calculates an updated value of the set frequency and inputs the same to the lens position controller.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile