Patent
1991-11-12
1992-12-15
Perkey, W. B.
354416, 354432, G03B 1505
Patent
active
051721570
ABSTRACT:
An automatic light adjustment device for cameras includes: a flashing device capable of effecting a preliminary and a main flashing; a photometer device, which performs divisional photometry on a field divided into a plurality of divisional areas at the time of the preliminary and main flashing of the flashing device, emitting photometry signals respectively corresponding to these areas; an area setting device, which makes a judgment, for each of the plurality of divisional areas, as to whether the level of the corresponding photometry signal at the time of the preliminary flashing is within a fixed range or not, judging the area to be one on which light adjustment is to be performed (an light-adjustment area) when the signal level is within the range, and judging it to be one which is to be excluded with respect to light adjustment (a non-light-adjustment area) when the signal level is out of the range; a discrimination device, which makes a judgment, for each of any non-light-adjustment areas detected, as to whether the level of the corresponding photometric signal at the time of the preliminary flashing is above or below the fixed range; and a light adjustment device, which determines a light adjustment condition for stopping the main flashing on the basis of the judgment results obtained by the discrimination device, stopping the main flashing when the photometry signals emitted at the time of the main flashing and corresponding to the light-adjustment areas have satisfied the light adjustment condition.
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Nikon Corporation
Perkey W. B.
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