Method and apparatus for the automatic control of exposure in ca

Details Method and apparatus for the automatic control of exposure in ca Method and apparatus for the automatic control of exposure in ca

1984-09-14

1986-05-20

Adams, Russell E.

354443, 354448, G03B 728, G03B 708

Patent

active

045897565

ABSTRACT:
An exposure control method and apparatus for camera enables to carry out TTL light intensity feedback metering based on the output of light-measurement even when the output has a value not within a predetermined range of arithmetic operation for exposure control. In the method and apparatus, the luminance of an object field formed by the light transmitted through a taking-lens is metered to generate photometric outputs. The photometric outputs are arithmetically processed to generate arithmetic outputs while inhibiting those of the photometric outputs from being arithmetically processed which are outside of a predetermined range of output value, the aperture value is controlled in accordance with the photometric outputs.

REFERENCES:
patent: 3717077 (1973-02-01), Harvey
patent: 3896472 (1975-07-01), Yoshiyama et al.
patent: 4196989 (1980-04-01), Toyoda et al.
patent: 4214826 (1980-07-01), Uchida et al.
patent: 4443080 (1984-04-01), Saegusa
patent: 4448506 (1984-05-01), Saegusa et al.

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