Method of controlling exposure

Details Method of controlling exposure Method of controlling exposure

1980-10-02

1983-07-19

Adams, Russell E.

G03B 708

Patent

active

043940781

ABSTRACT:
The exposure of a camera is controlled based on the scene brightness measured by use of a number of light measuring elements located at positions to receive light through from the scene. The light receiving area is divided into several zones. In each of the zones, at least one light measuring element is provided to measure the brightness of the scene in each zone and are used to give the maximum or minimum brightness (Bzi) in each zone. Exposure is controlled based on a weighted mean value ##EQU1## (K.sub.i+2 is a coefficient). In a preferred embodiment of the invention, another brightness (B.sub.0) such as a simple mean value of the outputs of all the light measuring elements is obtained, and the exposure is controlled based on the scene brightness B determined by the formula of ##EQU2##

REFERENCES:
patent: 3717077 (1973-02-01), Harvey
patent: 4176955 (1979-12-01), Yamada et al.
patent: 4214826 (1980-07-01), Uchida et al.

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