Photodetector circuit

Details Photodetector circuit Photodetector circuit

2008-10-24

2011-12-13

Ko, Tony (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S208100, C348S307000, C348S308000

Reexamination Certificate

active

08076631

ABSTRACT:
Two unshielded photosensors to determine the outside-light illuminance and two shielded photosensors are placed alternating both in the longitudinal direction and in the lateral direction. Then, the difference between the output of the unshielded photosensors and the output of the shielded photosensors is obtained. Accordingly, even when the thermoelectric currents differ from each other due to a variation in characteristics between the elements and a difference in the thermal distribution between the elements, the sensor currents can be corrected, so that a photodetector circuit which stably determines the outside-light illuminance can be provided.

REFERENCES:
patent: 2007/0046619 (2007-03-01), Sano et al.
patent: 2008/0073490 (2008-03-01), Koide
patent: 2008/0173794 (2008-07-01), Oike et al.
patent: 2004312497 (2004-11-01), None
patent: 2007-65004 (2007-03-01), None
patent: 2007-114315 (2007-05-01), None
patent: 10-2007-0026188 (2007-03-01), None
Korean Office Action mailed Aug. 9, 2010 in corresponding Korean patent application No. 10-2008-0105819.
Korean Office Action mailed Mar. 29, 2010 in Korean patent application No. 10-2008-0105819.

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