Luminance detecting circuit in which plural photoinduced current

Details Luminance detecting circuit in which plural photoinduced current Luminance detecting circuit in which plural photoinduced current

1995-12-27

1997-12-02

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250214R, 330110, H01J 4014

Patent

active

056939345

ABSTRACT:
Photocurrents outputted by photo detecting circuits (1.sub.1 to 1.sub.n) disposed in first current paths (2.sub.1 to 2.sub.n) are amplified by current amplifying means (3.sub.1 to 3.sub.n) disposed in the first current paths (2.sub.1 to 2.sub.n), respectively. The output currents from the plurality of current amplifying means (3.sub.1 to 3.sub.n) are converted into voltage all by one current-voltage converting means (5). The current amplifying means (3.sub.1 to 3.sub.n) are turned on or off by control signals (3.sub.1S to 3.sub.nS), and therefore the luminance detecting circuit amplifies the current of the required photo detecting element only, and outputs into the current-voltage converting means (5).

REFERENCES:
patent: 5111156 (1992-05-01), Hachiuma
patent: 5214527 (1993-05-01), Chang et al.
patent: 5515260 (1996-05-01), Watanabe et al.

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