Light measuring circuit having circuitry for bypassing a low fre

Details Light measuring circuit having circuitry for bypassing a low fre Light measuring circuit having circuitry for bypassing a low fre

1986-04-02

1988-03-15

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

330290, 330308, 250214RC, H01J 4014

Patent

active

047315296

ABSTRACT:
A light measuring circuit, consisting of an amplifying circuit amplifying the output of a photoelectric conversion element, is arranged to detect the occurrence of a low frequency component in the output of the photoelectric conversion element that comes to exceed a given level and, upon detection of that, to bypass the output of the photoelectric conversion element to prevent the output of the amplifying circuit from being saturated by a DC light (external or ambient light).

REFERENCES:
patent: 3872329 (1975-03-01), Dodson, III
patent: 4498001 (1985-02-01), Smoot
patent: 4626677 (1986-12-01), Browne
patent: 4636053 (1987-01-01), Sakane et al.
"Transresistance Photoamplifier with DC and Low-Frequency Notching Capability", by Burke Motorola Tech. Dis. Bull., vol. 1, No. 1, Aug. 1980, pp. 18-19.

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