Exposure information input circuit for electric shutter

Details Exposure information input circuit for electric shutter Exposure information input circuit for electric shutter

1980-04-25

1982-10-12

Hix, L. T.

354 60L, G03B 1718

Patent

active

043536310

ABSTRACT:
In an electric shutter having a photoelectric element, a time constant circuit for use in controlling exposure and a low brightness sensor circuit for use in connecting said photoelectric element in series with a comparator resistance and in sensing a low brightness in reference to its partial voltage, an exposure information input circuit for setting one reference voltage to be applied for determining said trigger levels of the two sensor circuits so as to feed exposure information such as film sensitivity, etc. and further having a function correction circuit between said reference voltage and one of said two sensor circuits.

REFERENCES:
patent: 3605589 (1971-09-01), Minegishi et al.
patent: 3698299 (1972-10-01), Arisaka et al.
patent: 3824606 (1974-07-01), Yoshiyama
patent: 4027314 (1977-05-01), Iguchi et al.
patent: 4077043 (1978-02-01), Nanba

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