Electric shutter device provided with an electric self-timer

Details Electric shutter device provided with an electric self-timer Electric shutter device provided with an electric self-timer

1979-04-20

1981-06-16

Hix, L. T.

354238, 354267, G03B 964, G03B 714

Patent

active

042734290

ABSTRACT:
An electric shutter device wherein an armature lever is attracted by an electromagnet by making a large current flow to the electromagnet only when the operation of a self-timer ends so that a normal exposure operation may be thereby started in order to minimize the power consumption during the operation of the electric self-timer. This electric shutter device is provided with a pair of shutter blades which are also diaphragm blades, a closing drive plate engageable with the armature lever to control the opening and closing of the shutter, an exposure time controlling circuit controlling the energizing time of the electromagnet to determine a proper exposure time, an exposure warning circuit and a flash controlling circuit.

REFERENCES:
patent: 3641902 (1972-02-01), Kikuchi
patent: 4174897 (1979-11-01), Matsumoto

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