Electric shutter circuit

Details Electric shutter circuit Electric shutter circuit

1974-07-23

1976-07-06

Hix, L. T.

354 50, 354 51, 354 60R, G03B 708

Patent

active

039685020

ABSTRACT:
An electric shutter circuit is disclosed, which linearly varies the resistance in a bias electric power source for setting exposure factors for an automatic exposure control to thereby adjust the collector current of an electric current controlling transistor in a negative feedback circuit, and which even at the time of the manual exposure time setting, linearly varies the resistance in the bias electric power source for introducing exposure factor and setting the exposure time manually to adjust the collector current in an electric current controlling transistor in the negative feedback circuit. This circuit features that the collector current in an exposure time controlling transistor is equalized to the collector current in the electric-current controlling transistor, so that the trigger level in a comparator detector in a time constant circuit will be maintained constant.

REFERENCES:
patent: 3641891 (1972-02-01), Burgarella
patent: 3733984 (1974-05-01), Yata
patent: 3849786 (1974-11-01), Nanba et al.
"Photodevices Have You in the Dark?", Snyder, Electronic Design Feb. 1, 1969, pp. 60-64.

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