Light measuring apparatus

Details Light measuring apparatus Light measuring apparatus

1979-01-11

1981-08-25

Hix, L. T.

354 51, G03B 708

Patent

active

042855829

ABSTRACT:
A light measuring apparatus comprising a photoelectric element exposed to incident light and coupled to a plurality of parallel-connected capacitors which integrate the photoelectric current output from the element. Control means successively switch each of the capacitors in parallel as the photoelectric current charges a first previously switched capacitors in accordance with the voltage integrated on the capacitors as sensed by a comparator. After a predetermined time, the parallel charged capacitors are discharged through a constant current source, with the discharge time being digitally monitored to produce a digital output proportional to the incident light level.

REFERENCES:
patent: 3868704 (1975-02-01), Yamada
patent: 3962708 (1976-06-01), Muramatsu
patent: 3974509 (1976-08-01), Tsuda et al.
patent: 4132985 (1979-01-01), Kitaura
patent: 4156562 (1979-05-01), Kawasaki et al.

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