Exposure control apparatus

Details Exposure control apparatus Exposure control apparatus

1990-02-20

1991-02-26

Adams, Russell E.

354435, G03B 708

Patent

active

049965514

ABSTRACT:
An exposure control apparatus has a photometry unit for measuring the brightness at a plurality of divisional areas of a subject screen. A correct exposure time is calculated in accordance with signals obtained by measuring the brightness at the plurality of divisional areas with the photometry unit when a shutter blade is closed. A light-receiving aperture is formed in the shutter blade. The photometry unit or another photometry unit is disposed at the back of the shutter blade to thereby measure light from the subject screen as the shutter blade is opened. When the measured value takes a value corresponding to the exposure time, the shutter blade is closed.

REFERENCES:
patent: 3538823 (1970-11-01), Wagner
patent: 3664245 (1972-05-01), Bresson et al.
patent: 4052726 (1977-10-01), Hopfner et al.
patent: 4172644 (1979-10-01), Wagner et al.
patent: 4176929 (1979-12-01), Ito et al.

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