Electromagnetic shutter

Details Electromagnetic shutter Electromagnetic shutter

1982-10-25

1985-01-22

Perkey, William B.

354412, 354435, 354484, 3542341, G03B 708, G03B 726, G03B 908

Patent

active

044948468

ABSTRACT:
The electromagnetic shutter in a camera having an exposure control circuit comprises shutter blades for opening and closing the aperture of the shutter, a shutter control circuit having a photoelectric element for measuring the scene brightness so as to generate the proper exposure signal, holding means for releasably holding the shutter blades in closed positions, spring means for opening the shutter blades when the shutter blades in the closed positions are released, and electromagnetic driving means actuated by the proper exposure signal for driving the shutter blades from the open positions to the closed positions against the action of spring means so as to permit the shutter blades to be held in the closed positions by the holding means. An energy saving is thereby achieved, because it is only necessary to actuate the holding means so as to release the shutter blades in the closed positions to open the shutter blades by the action of the spring means and to actuate the electromagnetic driving means for moving the shutter blades from open positions to closed positions at which the shutter blades are retained by the holding means.

REFERENCES:
patent: 3927415 (1975-12-01), Petersen
patent: 4290683 (1981-09-01), Bagdis

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