Camera shutter

Details Camera shutter Camera shutter

1975-03-19

1976-04-20

Peters, Jr., Joseph F.

354246, G03B 940, G03B 962, G03B 708

Patent

active

039523179

ABSTRACT:
A camera shutter has opening and closing blades mounted to be sequentially moved to effect exposure of film in the camera. The opening blade moves to permit an exposure to begin and the closing blade is retained, by a light responsive electromagnetic circuit, in a position to permit the exposure to continue for a duration related to scene brightness. An armature, controlled by the electromagnetic circuit, engages the closing blade and is engaged by the opening blade throughout a portion of its opening movement, thus preventing release of the closing blade prior to the opening blade reaching a preset position in its movement. In the event that the electromagnet is inoperative, the delay of the closing blade is determined by the time that the opening blade engages the armature.

REFERENCES:
patent: 3479935 (1969-11-01), Harvey
patent: 3670636 (1972-06-01), Holle
patent: 3705536 (1972-12-01), Lermann
patent: 3709113 (1973-06-01), Wood
patent: 3829877 (1974-08-01), Kitai
patent: T922009 (1974-05-01), Alessi

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