发明授权
- 专利标题: Exposure quantity control circuit
- 专利标题(中): 曝光量控制电路
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申请号: US596018申请日: 1975-07-15
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公开(公告)号: US4033682A公开(公告)日: 1977-07-05
- 发明人: Yukio Nakamura , Shougo Kato , Shinji Nagaoka
- 申请人: Yukio Nakamura , Shougo Kato , Shinji Nagaoka
- 申请人地址: JA
- 专利权人: Seiko Koki Kabushiki Kaisha
- 当前专利权人: Seiko Koki Kabushiki Kaisha
- 当前专利权人地址: JA
- 优先权: JA49-83556 19740715; JA49-83557 19740715
- 主分类号: G03B7/083
- IPC分类号: G03B7/083 ; G03B9/62 ; G03B9/08
摘要:
An electric shutter is opened and closed to effect an exposure in dependence upon the energization of an electromagnet. A switching circuit controls the energization of the electromagnet in accordance with various exposure information, such as diaphragm setting and film sensitivity. An exposure control circuit comprised of a series connection of a diode and a variable resistor is connected in parallel with the electromagnet and adjustably controls the time at which the electromagnet is deenergized to accordingly effect closing of the shutter such that the electromagnet delay time equals the shutter sector advancing time to thereby compensate for fluctuations between the two times.
公开/授权文献
- US5707213A Molecular vacuum pump with a gas-cooled rotor 公开/授权日:1998-01-13