Shutter for a camera

Details Shutter for a camera Shutter for a camera

1974-04-30

1976-04-13

Hix, L. T.

354241, 354242, 354258, G03B 908, G03B 928

Patent

active

039507726

ABSTRACT:
A shutter having two groups of shutter blades. One group of shutter blades opens the shutter and a second group of blades closes the shutter. A shutter-opening actuation member releasably locked by a locking pawl when the shutter is cocked, actuates the shutter-opening group of shutter blades for taking an exposure. A shutter-closing actuation member releasably locked by a second locking pawl actuates the shutter-closing group of shutter blades for completing the taking of an exposure. An electromagnet in an exposure control circuit is energized during the taking of an exposure and deenergized to control the exposure time and terminate the exposure. A control member that controls the release of the control member by its locking pawl is biased by a single spring. The single spring develops a force directed toward applying the control member to the electromagnet when the shutter is cocked and develops a force directed toward separating the control member from the electromagnet and releasing the actuation member and actuating it to close the shutter when the electromagnet is de-energized.

REFERENCES:
patent: 3208365 (1965-09-01), Cooper, Jr. et al.
patent: 3657982 (1972-04-01), Uno et al.
patent: 3721166 (1973-03-01), Yanagi et al.
patent: 3722391 (1973-03-01), Kitai

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