| 发明名称 |
Visual exposure indicator in photographic apparatus |
| 摘要 |
Three electric lamps with different voltage-illumination thresholds are connected to be successively turned on to show exposure times by an electronic switch, such as a transistor, connected to a voltage divider composed of a photoconductor, exposed to scene light, and a resistor.
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| 申请公布号 |
US4037232(A) |
申请公布日期 |
1977.07.19 |
| 申请号 |
US19730324896 |
申请日期 |
1973.01.18 |
| 申请人 |
AGFA-GEVAERT, A.G. |
发明人 |
WAGNER, KARL;VON FISCHERN, BERNHARD |
| 分类号 |
G03B17/20;(IPC1-7):G03B17/20 |
主分类号 |
G03B17/20 |
| 代理机构 |
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代理人 |
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| 地址 |
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