发明名称 |
PHOTOMETRIC SYSTEM FOR CAMERAS |
摘要 |
An exposure control system which automatically compensates for variations in background lighting by exposing a single photocell alternately to the subject and then to the background. A reversing switch is operated synchronously with the means for alternating the exposure of the photocell in such a manner to reverse the direction of the current through the exposure control synchronously with the alternation of the photocell exposure to the scene.
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申请公布号 |
US3661466(A) |
申请公布日期 |
1972.05.09 |
申请号 |
USD3661466 |
申请日期 |
1970.06.25 |
申请人 |
EASTMAN KODAK CO.;LINCOLN ROCHESTER TRUST CO. |
发明人 |
ALLEN G. STIMSON;JOHN H. EAGLE |
分类号 |
G01J1/42;(IPC1-7):G01J1/34;G01J1/36;G01J1/40 |
主分类号 |
G01J1/42 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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