Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Reexamination Certificate
2007-03-29
2008-10-14
Le, Que T (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
C250S214100
Reexamination Certificate
active
07435943
ABSTRACT:
A light sensor that generates a first output signal indicative of an intensity of light received from a predetermined direction in a first band of wavelengths is disclosed. The light sensor includes a substrate having first and second photodetectors, a first filter layer, and a controller. The photodetectors are sensitive to light in the infrared portion of the optical spectrum as well as to light in the first band of wavelengths, and generate first and second photodetector signals. The first filter layer transmits light in the first band of wavelengths and light in the infrared portion of the optical spectrum while blocking light in a portion of the visible spectrum outside of the first band of wavelengths, without altering light received by the first photodetector. The controller processes the first and second photodetector signals to produce the first output signal that is corrected for infrared in the input light.
REFERENCES:
patent: 4651001 (1987-03-01), Harada et al.
Chen Farn Hin
Chew Gim Eng
Tan Boon Keat
Avago Technologies ECBU IP Pte Ltd
Le Que T
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