Automatic exposure control circuit

Details Automatic exposure control circuit Automatic exposure control circuit

1984-11-16

1985-11-05

Perkey, William B.

354461, G03B 7083

Patent

active

045509972

ABSTRACT:
An automatic exposure control circuit of a photographing camera having a shutter blade associated with an electromagnet driven by a driving circuit is disclosed, which is featured by having a film sensitivity information detector for detecting the film sensitivity electrically to provide an output signal, means responsive to the output signal for changing a reference voltage to be applied to the driving circuit and a .gamma. value correcting means for correcting the reference voltage according to the .gamma. value of a light receiving element of the camera.

REFERENCES:
patent: 3429242 (1969-02-01), Yoshida et al.
patent: 3683767 (1972-08-01), Sahara et al.
patent: 3786733 (1974-01-01), Kitai
patent: 3798644 (1974-03-01), Matsuda
patent: 4353631 (1982-10-01), Takazawa et al.

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