Light measuring device

Details Light measuring device Light measuring device

1987-02-02

1988-11-22

Hix, L. T.

Optics: measuring and testing

Range or remote distance finding

With photodetection

356222, G03B 708

Patent

active

047869356

ABSTRACT:
A light measuring device comprises light receiving means arranged to divide a photographing field at least into three areas including a middle area located in the middle of the field, a first outer area located on the outer side of the middle area and a second outer area located on the outer side of the first outer area and to obtain luminance information on each of the areas; luminance difference detecting means for obtaining information of a luminance difference between adjacent areas among the plurality of areas from a plurality of luminance information values obtained by the light receiving means; computing means including photometric value computing circuits equivalent to a plurality of computing formulas each of which including as a function at least one of the plurality of luminance information values obtained by the light receiving means; and selection means for selecting one of the photometric value computing circuits of the computing means which is equivalent to one of the computing formulas on the basis of at least one of the plurality of luminance information values obtained by the light receiving means and the luminance difference information obtained by the luminance difference detecting means.

REFERENCES:
patent: 4394078 (1983-07-01), Terashita
patent: 4527881 (1985-07-01), Sugawara

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