Exposure control apparatus

Details Exposure control apparatus Exposure control apparatus

1986-04-24

1987-12-29

Adams, Russell E.

3542341, 3542711, G03B 908, G03B 914

Patent

active

047164328

ABSTRACT:
Exposure control apparatus is disclosed for controlling the amount of light admitted to a photosensitive surface. The apparatus comprises an electromagnetic actuator having a pair of aperture blades which are biased toward a rest position and are movable away from the rest position to define an aperture; the aperture blades also function as a shutter. A control means regulates current supplied to the actuator to control aperture size and exposure time. In order to precisely control the exposure interval, the control means includes a means for continuously sensing the position of at least one of the aperture blades.

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