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:
Jul. 24, 2012
Filed:
Dec. 18, 2008
Kenji Kawazoe, Hyogo, JP;
Yasuhiro Shingu, Kyoto, JP;
Norikazu Katsuyama, Osaka, JP;
Hiroyuki Kawahara, Osaka, JP;
Kenji Kawazoe, Hyogo, JP;
Yasuhiro Shingu, Kyoto, JP;
Norikazu Katsuyama, Osaka, JP;
Hiroyuki Kawahara, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
An image pickup apparatus of the present invention is an image pickup apparatus including an ultrasonic motorthat moves a focus lens, and further including a correction control partthat operates the ultrasonic motorunder a predetermined condition. The correction control partis capable of executing a correction process by measuring a frequency characteristic of an applied voltage at the time of operating the ultrasonic motorat a predetermined rotation speed, comparing the frequency characteristic with a preset reference frequency characteristic, and correcting the frequency characteristics on the basis of a difference between the frequency characteristic and the reference frequency characteristic so as to calculate a correction frequency characteristic. Accordingly, even when the frequency characteristic of the ultrasonic motor varies due to wear of the ultrasonic motor and mechanical components coupled thereto, a stable drive can be maintained over a long time.