Photocurrent charge type exposure measuring apparatus

Details Photocurrent charge type exposure measuring apparatus Photocurrent charge type exposure measuring apparatus

1993-09-01

1994-12-27

Perkey, W. B.

G03B 708

Patent

active

053769929

ABSTRACT:
An output current of a photodiode is charged in a capacitor, and the voltage change of the capacitor is monitored by a plurality of comparators. The time required for the capacitor voltage to reach a predetermined value is counted by using a clock signal input unit for inputting a clock signal of a predetermined frequency, and a counter for counting an upper part of a number corresponding to a logarithm of a number of clocks of the clock signal generated after the integration start by a photoelectric conversion unit. The outputs of the comparators when the counter counts the upper part are latched, and the lower part of the number is supplied.

REFERENCES:
patent: 4184151 (1980-01-01), Iwata
patent: 4843419 (1989-06-01), Sato

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