Exposure control device in a camera

Details Exposure control device in a camera Exposure control device in a camera

1986-05-08

1987-05-26

Perkey, W. B.

G03B 708

Patent

active

046680691

ABSTRACT:
An exposure control device in a camera comprises power supply circuit means for producing a temperature signal representative of an amount proportional to the absolute temperature, means for producing a first digital data representative of the film speed, digital-analog converting means for producing a first analog output depending on the ambient temperature from the first digital data and the temperature signal, photometering means having means for producing a second analog output corresponding to the brightness of an object to be photographed and means for adding the second analog output to the first analog output and preparing a photometering output, analog-digital converting means for preparing a second digital data independent on the ambient temperature from the temperature signal and the photometering output, and means for determining the exposure in accordance with the second digital data.

REFERENCES:
patent: 4007467 (1977-02-01), Wagensonner et al.
patent: 4247186 (1981-01-01), Uchidoi et al.
patent: 4383749 (1983-05-01), Shinoda et al.
patent: 4442381 (1984-04-01), Numota
patent: 4453811 (1984-06-01), Yamasaki

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