Photometric apparatus

Details Photometric apparatus Photometric apparatus

1996-11-12

1998-06-16

Perkey, W. B.

Photography

Exposure control circuit

Having plural photocells

356222, 348298, G03B 708, G01J 142, H04N 5235

Patent

active

057685401

ABSTRACT:
A photometric apparatus is capable of obtaining a precise photometric value without any saturation of a photometric output value even when measuring a light intensity of a flicker light source. The photometric apparatus has a photometric portion for measuring the field by use of a charge type photometric device, and a charge time determining portion for determining a value of a next charge time of the photometric device on the basis of an output value of the photometric portion and a value of the charge time at that time. The charge time determining portion determines the value of the next charge time so that a photometric output value in the next photometric process approximates a predetermined target value.

REFERENCES:
patent: 5526092 (1996-06-01), Iwasaki

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