Electric shutter operating circuits

Details Electric shutter operating circuits Electric shutter operating circuits

1974-08-29

1976-06-29

Hix, L. T.

354 50, 354 51, 354 53, G03B 700

Patent

active

039672883

ABSTRACT:
In an electronic shutter operating circuit for use in a photographic camera a differential amplifier comprising a pair of transistors is provided for comparing the photosensitivity of the film used and the brightness of the object to display over exposure and under exposure conditions. A voltage is positively fed back from the output of the differential amplifier to the input thereof to cause it to oscillate for displaying the correct exposure condition. There is provided a transfer switch to cause the differential amplifier to respond to the selected shutter time for closing the shutter when the shutter time expires.

REFERENCES:
patent: 3436158 (1969-04-01), Schmitt
patent: 3581643 (1971-06-01), Yoshimura
patent: 3594088 (1971-07-01), Akiyama et al.
patent: 3745902 (1973-07-01), Taguchi
patent: 3765006 (1973-10-01), Takahashi et al.
patent: 3849769 (1974-11-01), Chiba

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