发明授权
US08228389B2 Image pickup apparatus, interchangeable lens unit, camera body, and ultrasonic motor driving apparatus
有权
图像拾取装置,可互换镜头单元,照相机主体和超声波马达驱动装置
- 专利标题: Image pickup apparatus, interchangeable lens unit, camera body, and ultrasonic motor driving apparatus
- 专利标题(中): 图像拾取装置,可互换镜头单元,照相机主体和超声波马达驱动装置
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申请号: US12338216申请日: 2008-12-18
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公开(公告)号: US08228389B2公开(公告)日: 2012-07-24
- 发明人: Kenji Kawazoe , Yasuhiro Shingu , Norikazu Katsuyama , Hiroyuki Kawahara
- 申请人: Kenji Kawazoe , Yasuhiro Shingu , Norikazu Katsuyama , Hiroyuki Kawahara
- 申请人地址: JP Osaka
- 专利权人: Panasonic Corporation
- 当前专利权人: Panasonic Corporation
- 当前专利权人地址: JP Osaka
- 代理机构: Hamre, Schumann, Mueller & Larson, P.C.
- 优先权: JP2007-328674 20071220
- 主分类号: H04N5/225
- IPC分类号: H04N5/225 ; H02N2/00
摘要:
An image pickup apparatus of the present invention is an image pickup apparatus including an ultrasonic motor 35 that moves a focus lens 24, and further including a correction control part 100 that operates the ultrasonic motor 35 under a predetermined condition. The correction control part 100 is capable of executing a correction process by measuring a frequency characteristic of an applied voltage at the time of operating the ultrasonic motor 35 at 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.
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