Photometric device

Details Photometric device Photometric device

1987-12-18

1989-09-26

Perkey, W. B.

Optics: measuring and testing

Range or remote distance finding

With photodetection

356222, G03B 708, G01J 142

Patent

active

048704431

ABSTRACT:
A photometric device of the kind obtaining information on the luminance of each of photometric areas defined by dividing a photographing field at least into a middle area and a peripheral area and computing a photometric value on the basis of luminance information obtained from the middle and peripheral areas includes: detecting means for detecting whether the luminance information obtained from the peripheral area exceeds a given upper limit luminance level; and correcting means which is arranged to substitute a specific luminance information value for the luminance information obtained from the peripheral area when the latter is detected by the detecting means to be exceeding the upper limit luminance level.

REFERENCES:
patent: 3717077 (1973-02-01), Harvey
patent: 4364650 (1982-12-01), Terashita et al.
patent: 4589756 (1986-05-01), Saegusa

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