Programmed shutter control circuit

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Details

354 24, 354 50, 354 60R, G03B 708

Patent

active

043186009

ABSTRACT:
An electronic shutter control circuit comprises a photo-conductive material producing a signal to be applied to the first transistor, a second transistor having a base connected to its collector, the second transistor being serially connected to the first transistor, a third having a base transistor connected to the collector of the first transistor having a base, a fourth transistor connected to its collector, the fourth transistor being serially coupled to the third transistor, a current supplier circuit connected to the fourth transistor, a capacitor serially coupled to the third transistor, and a comparison circuit connected to the capacitor for detecting a charge amount condensed by the capacitor and for providing shutter operation signals used for operation of a shutter mechanism.

REFERENCES:
patent: 3731603 (1973-05-01), Ono et al.
patent: 3866240 (1975-02-01), Tsujimoto
patent: 4032801 (1977-06-01), Fulkerson
patent: 4099188 (1978-07-01), Uno et al.
patent: 4112441 (1978-09-01), Kawasaki
patent: 4181413 (1980-01-01), Kawasaki
patent: 4264163 (1981-04-01), Hickok et al.
patent: 4269490 (1981-05-01), Takami

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