发明授权
- 专利标题： Controlling circuit for electric shutters
- 专利标题（中）： 电动百叶窗控制电路
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申请号： US838225申请日： 1977-09-30
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公开(公告)号： US4143958A公开(公告)日： 1979-03-13
- 发明人: Yasuo Ishiguro , Kenji Wakazono
- 申请人： Yasuo Ishiguro , Kenji Wakazono
- 申请人地址： JPX Tokyo
- 专利权人： Copal Company Limited
- 当前专利权人： Copal Company Limited
- 当前专利权人地址： JPX Tokyo
- 优先权： JPX51-134868[U] 19761008; JPX51-159907 19761227
- 主分类号： G03B9/62
- IPC分类号： G03B9/62 ; G03B17/40
摘要：
A controlling circuit for electric shutters wherein, in an electric shutter adapted to start a shutter closing moton by energizing a driving coil with a discharge current from a capacitor, the capacitor is made to be discharged by a voltage drop detecting circuit provided so that the shutter may be positively closed even in case a current source switch is opened by an unexpected accident in the course of an exposure controlling operation.
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