Shutter for a photogrammetric camera
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United States of America Patent
Stats
-
Jul 17, 1990
Grant Date -
N/A
app pub date -
Aug 30, 1989
filing date -
Nov 5, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
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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International Classification(s)
Cited Art Landscape
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