Light integrating circuit for use in a light measuring device wh

Details Light integrating circuit for use in a light measuring device wh Light integrating circuit for use in a light measuring device wh

1987-10-09

1989-02-28

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

354427, 356223, 250214P, G01J 100, G03B 708

Patent

active

048088110

ABSTRACT:
A light measuring circuit including a light sensing device for sensing light and producing a signal representative of the light sensed, a compressing circuit for compressing the signal, a capacitor having one terminal connected to a predetermined voltage, a charging circuit responsive to the compressing circuit for charging the capacitor, a detecting circuit for responding to the voltage level of the capacitor, a switch for shorting the capacitor when closed for initiating charge of the capacitor by opening, and a delay circuit coupled to one of the charging circuits and the switch for delaying the onset of charge of the capacitor.

REFERENCES:
patent: 3679905 (1972-07-01), Watanabe
patent: 3928860 (1975-12-01), Numata et al.
patent: 4241279 (1980-12-01), Numata
patent: 4357084 (1982-11-01), Kimura

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