发明名称 |
Shutter for a photogrammetric camera |
摘要 |
The invention is directed to a shutter wherein the rotary discs thereof are accelerated out of a standstill start position for each exposure operation and are again brought to standstill at the end of the exposure operation. The start position is computed such that a constant access time results for all exposure times. An electronic control circuit for the shutter includes a position-control circuit and a speed-control circuit. During each exposure operation, the drive for the rotary discs of the shutter are switched between the two control loops.
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申请公布号 |
US4942415(A) |
申请公布日期 |
1990.07.17 |
申请号 |
US19890400686 |
申请日期 |
1989.08.30 |
申请人 |
CARL-ZEISS-STIFTUNG |
发明人 |
FELLE, KARL;KRASTEL, HEINZ |
分类号 |
G03B9/10;G03B9/20 |
主分类号 |
G03B9/10 |
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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