Method of controlling the closure of a slot with two light tight curtains, each with their own motor, for use in cameras

摘要

the method involves having one curtain (2) in its closed position and the other (1) in its open position before the illumination stars. At the start both motors (3,4) are driven in the open direction, whereby the open curtain (1) is forced against a definite open stop. By inverting its drive it is driven towards the closed position and terminates the illumination.