Double light blocking shutter

Details Double light blocking shutter Double light blocking shutter

1989-09-26

1990-12-11

Brown, Brian W.

354249, G03B 940

Patent

active

049774212

ABSTRACT:
A shutter having leading and trailing blade groups with an operating mechanism comprising a first drive member for the leading blade group, a second drive member for the trailing blade group, an energizing member movably supported to push the second drive member so that the shutter is given the driving power of a direction in which it runs, a moving member for moving the energizing member from a position where running of the shutter is completed to a position where the shutter is ready to run, and a mechanism for controlling the movement of the second drive member in accordance with movement of the moving member, wherein the mechanism moves the second drive member between a position where the leading and trailing blade groups both cover an exposure aperture of the shutter to effect double light-blocking, and a position where the aperture is covered by the leading blade group alone as the double light-blocking is cancelled.

REFERENCES:
patent: 4114174 (1978-09-01), Onda et al.
patent: 4829329 (1989-05-01), Toyoda et al.
patent: 4847649 (1989-07-01), Toyoda et al.

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