发明授权
US4273428A Digital exposure-duration control circuit with upper limit on exposure
duration
失效
数字曝光持续时间控制电路，曝光时间上限
- 专利标题： Digital exposure-duration control circuit with upper limit on exposure duration
- 专利标题（中）： 数字曝光持续时间控制电路，曝光时间上限
-
申请号： US32902申请日： 1979-04-24
-
公开(公告)号： US4273428A公开(公告)日： 1981-06-16
- 发明人: Kurt Borowski , Eduard Wagensonner , Istvan Cocron
- 申请人： Kurt Borowski , Eduard Wagensonner , Istvan Cocron
- 申请人地址： DEX Leverkusen
- 专利权人： AGFA Gevaert, A.G.
- 当前专利权人： AGFA Gevaert, A.G.
- 当前专利权人地址： DEX Leverkusen
- 优先权： DEX2818606 19780427
- 主分类号： G03B7/16
- IPC分类号： G03B7/16 ; G03B17/18 ; G03B7/093
摘要：
A first pulse train whose pulse repetition frequency varies in dependence upon scene light, and a second pulse train whose pulse repetition frequency does not vary in dependence upon scene light, are counted by digital counting circuitry, and a terminate-exposure signal is produced when the digital counting circuitry reaches a predetermined count. The second pulse train serves to establish an upper permissible limit for the duration of the exposure to be performed.
公开/授权文献
信息查询
