Optical sensing circuit with voltage to current converter...

Details Optical sensing circuit with voltage to current converter... Optical sensing circuit with voltage to current converter...

2006-01-10

2006-01-10

Porta, David (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C327S103000, C327S514000

Reexamination Certificate

active

06984814

ABSTRACT:
An optical sensing circuit is provided with a light detector, a voltage to current conversion circuit connected to the light detector, and a comparator. The voltage to current conversion circuit includes an electric resistor and a current mirror circuit connected in parallel to the resistor. The voltage to current conversion circuit increases an electric current flowing through the circuit as a voltage of the output of the light detector decreases. The comparator compares the voltage of the output of the light detector with a reference voltage.

REFERENCES:
patent: 4491807 (1985-01-01), Hoover
patent: 6307196 (2001-10-01), Thompson et al.
patent: 6420912 (2002-07-01), Hsu et al.
patent: 6586919 (2003-07-01), Viehmann
patent: 2002/0167344 (2002-11-01), Zha et al.
patent: 2003/0178552 (2003-09-01), Hofmeister et al.

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