Exposure quantity control circuit

Details Exposure quantity control circuit Exposure quantity control circuit

1975-07-15

1977-07-05

Adams, Russell E.

Optics: motion pictures

Picture carriers

Strip type

354 50, 354 51, 354 60R, 354234, G03B 908

Patent

active

040336824

ABSTRACT:
An electric shutter is opened and closed to effect an exposure in dependence upon the energization of an electromagnet. A switching circuit controls the energization of the electromagnet in accordance with various exposure information, such as diaphragm setting and film sensitivity. An exposure control circuit comprised of a series connection of a diode and a variable resistor is connected in parallel with the electromagnet and adjustably controls the time at which the electromagnet is deenergized to accordingly effect closing of the shutter such that the electromagnet delay time equals the shutter sector advancing time to thereby compensate for fluctuations between the two times.

REFERENCES:
patent: 3487757 (1970-01-01), Kiper
patent: 3682058 (1972-08-01), Wada
patent: 3683767 (1972-08-01), Sahara
patent: 3721166 (1973-03-01), Yanagi et al.
patent: 5953867 (1976-04-01), Kondo

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