发明授权
- 专利标题: Indicating apparatus for electronic flash system of TTL light measurement type
- 专利标题(中): TTL光测量型电子闪光灯系统指示装置
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申请号: US319618申请日: 1981-11-09
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公开(公告)号: US4449803A公开(公告)日: 1984-05-22
- 发明人: Masanori Yamada , Akira Hiramatsu
- 申请人: Masanori Yamada , Akira Hiramatsu
- 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: JPX55-159906 19801113
- 主分类号: G03B7/16
- IPC分类号: G03B7/16 ; G03B15/05
摘要:
An annunciating apparatus for use with an electronic flash system includes a flash system which employs a trigger device generating a trigger signal at a time of test light emission and a light producing device responsive to the trigger signal for initiating operation of the light producing device to produce light. The annunciating apparatus includes a light sensitive device arranged to receive light passed through a photographic taking lens and produces a first electrical signal corresponding to an amount of light from a scene. The annunciating apparatus also includes a signal generating device for producing a second electrical signal corresponding to an aperture value preset on a camera at the time of test light emission for the electronic flash system and a comparison device for receiving the first and second signals to produce a control signal when the first electrical signal reaches a predetermined level. Finally, an annunciator responsive to the control signal annunciates whether a correct exposure obtains.
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