发明授权
- 专利标题: Electromagnetically driven shutter
- 专利标题(中): 电磁驱动快门
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申请号: US153860申请日: 1980-05-28
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公开(公告)号: US4338014A公开(公告)日: 1982-07-06
- 发明人: Syozo Yoshida , Yoichi Tosaka
- 申请人: Syozo Yoshida , Yoichi Tosaka
- 申请人地址: JPX Tokyo
- 专利权人: Canon Kabushiki Kaisha
- 当前专利权人: Canon Kabushiki Kaisha
- 当前专利权人地址: JPX Tokyo
- 优先权: JPX54-67161 19790529
- 主分类号: G03B7/00
- IPC分类号: G03B7/00 ; G03B9/34 ; G03B9/36 ; G03B9/58 ; G03B9/62 ; G03B9/08
摘要:
In the disclosed electromagnetically driven shutter, a leading shutter member and a trailing shutter member are driven by respective electromagnetic drive sources through an exposure operation and a return operation. Selector switches supply drive current from a battery to electromagnetic coils of the drive sources and control the direction of the drive current. After an exposure operation, a relay sets the switches for a return operation and resets the switches for exposure. Preferably, the relay is controlled by signals delayed by different delay times from the termination of the exposure operation so as to set the switches correctly.
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