发明授权
- 专利标题: Automatic exposure control circuit for a single lens reflex camera of TTL light measuring type
- 专利标题(中): TTL光测量型单反相机自动曝光控制电路
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申请号: US550908申请日: 1975-02-19
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公开(公告)号: US3975746A公开(公告)日: 1976-08-17
- 发明人: Norio Beppu
- 申请人: Norio Beppu
- 申请人地址: JA Osaka
- 专利权人: Minolta Camera Kabushiki Kaisha
- 当前专利权人: Minolta Camera Kabushiki Kaisha
- 当前专利权人地址: JA Osaka
- 优先权: JA49-22640 19740225
- 主分类号: G03B7/089
- IPC分类号: G03B7/089 ; G03B7/083 ; G03B7/099 ; G03B7/0997 ; G03B9/62 ; G03B7/08
摘要:
An automatic exposure control circuit for a single lens reflex camera of the TTL light measuring type in which light entering through an eyepiece, in addition to light entering through an objective lens, is compensated for accurate exposures of the film. The automatic exposure control circuit of the invention is characterized in that, even if the characteristics of the circuit components for the two measured values of light are not exactly identical with each other, predetermined correct shutter control characteristics can be obtained through the provision of voltage control means for trigger levels, by which arrangement, marked improvement is achieved from the view point of mass production.
公开/授权文献
- US5601726A Hydroxameted polymers in the bayer process to reduce solids 公开/授权日:1997-02-11