Digital exposure-duration control circuit with upper limit on ex

Details Digital exposure-duration control circuit with upper limit on ex Digital exposure-duration control circuit with upper limit on ex

1979-04-24

1981-06-16

Hix, L. T.

354 51, 354 60L, 354 60F, 354133, G03B 7093

Patent

active

042734282

ABSTRACT:
A first pulse train whose pulse repetition frequency varies in dependence upon scene light, and a second pulse train whose pulse repetition frequency does not vary in dependence upon scene light, are counted by digital counting circuitry, and a terminate-exposure signal is produced when the digital counting circuitry reaches a predetermined count. The second pulse train serves to establish an upper permissible limit for the duration of the exposure to be performed.

REFERENCES:
patent: 3958256 (1976-05-01), Wagensonner
patent: 4006484 (1977-02-01), Nobusawa
patent: 4140379 (1979-02-01), Von Fischern
patent: 4171884 (1979-10-01), Tokutomi

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