发明授权
- 专利标题: Camera
- 专利标题(中): 相机
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申请号: US241968申请日: 1994-05-12
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公开(公告)号: US5477298A公开(公告)日: 1995-12-19
- 发明人: Michihiro Shiina , Jun'ichi Iwamoto , Fumio Iwai
- 申请人: Michihiro Shiina , Jun'ichi Iwamoto , Fumio Iwai
- 申请人地址: JPX Saitama
- 专利权人: Fuji Photo Optical Co. Ltd.
- 当前专利权人: Fuji Photo Optical Co. Ltd.
- 当前专利权人地址: JPX Saitama
- 优先权: JPX5-113431 19930514
- 主分类号: G02B7/04
- IPC分类号: G02B7/04 ; G02B7/08 ; G02B7/10 ; G03B5/00 ; G03B17/04 ; G03B3/10
摘要:
A camera having a zoom system which comprises a front lens group driven by a DC motor and a rear lens group driven by a stepping motor includes a motor control apparatus for controlling the DC motor and the stepping motor. The motor control apparatus voltage measuring means for measuring a voltage of a power source for driving the DC motor and the stepping motor, decision means for deciding as to whether the voltage is more than a predetermined value, means for simultaneously driving the DC motor and the stepping motor, if a decision is made that the voltage is more than the predetermined value, and means for driving only the DC motor and thereafter driving only the stepping motor, if the voltage is not more than the predetermined value.
公开/授权文献
- US4368976A Variable speed scanning system 公开/授权日:1983-01-18