Electronic shutter for still cameras

Details Electronic shutter for still cameras Electronic shutter for still cameras

1983-03-21

1985-03-19

Mathews, A. A.

354230, 354247, G03B 940

Patent

active

045055637

ABSTRACT:
An electronic shutter mechanism for a still camera comprises a shutter blade, preferably carrying a solenoid armature, urged by a first spring into an initial lens aperture closing position. An initially latched actuating member for moving the shutter blade to a lens aperture exposing position carries a normally energized solenoid coil to attract the shutter blade carried armature thereto so that the shutter blade moves with the actuating member until the coil is deenergized. When the actuating member is unlatched, a second spring urges the actuating member and the shutter blade magnetically attached thereto into a lens aperture opening position against the return force of the first spring. Upon the unlatching of the actuating member a timing circuit establishes a timing period depending upon the amount of ambient light, after which the solenoid coil is deenergized so the first spring returns the shutter blade quickly to a lens aperture closing position.

REFERENCES:
patent: 3241471 (1966-03-01), Burgarella
patent: 3820131 (1974-06-01), Tanaka
patent: 3893134 (1975-07-01), Brauning
patent: 3916425 (1975-10-01), Tanaka
patent: 3995295 (1976-11-01), Douglas

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