Exposure control device for camera

Details Exposure control device for camera Exposure control device for camera

1984-02-27

1985-04-23

Perkey, William B.

354427, 354428, 354464, G03B 7083, G03B 724

Patent

active

045126437

ABSTRACT:
An exposure control device for a camera wherein a current produced from a light sensitive element in proportion to the quantity of light incident on the element is logarithmically suppressed. A suppressed voltage obtained from this current to which voltage is added a voltage which is substantially proportional to absolute temperature and is produced according to encoded film sensitivity information expressed in the APEX system. The voltage resulting from the addition is converted into a current and expanded. The degree of an exposure is controlled on the basis of the expanded current.

REFERENCES:
patent: 4037234 (1977-07-01), Tunekawa et al.
patent: 4072961 (1978-02-01), Yamada
patent: 4181413 (1980-01-01), Kawasaki et al.
patent: 4200371 (1980-04-01), Suzuki et al.
patent: 4459574 (1984-07-01), Tokuda

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