Reflective color filter for color correction of photodetector fi

Details Reflective color filter for color correction of photodetector fi Reflective color filter for color correction of photodetector fi

1996-01-24

1997-09-09

Le, Que

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

2502081, 358512, 359590, G01J 350

Patent

active

056659636

ABSTRACT:
A color filter system for an optical system, applicable to optical systems in color image scanners, copiers, video cameras and digital cameras. The optical system includes a photosensor army, transmissive color filters on the photosensor array and a corrective reflective filter adjacent to the photosensor array. The transmissive color filters on the photosensor array are imperfect, transmitting too much visible red as well as infrared. The adjacent reflective filter compensates by suppressing longer visible red wavelengths and infrared wavelengths. The combination provides color precision with cost and manufacturing advantages relative to attempting to provide precise transmissive filters on the photosensor array or relative to providing compensation filters elsewhere in the system.

REFERENCES:
patent: 4721999 (1988-01-01), Takemura et al.
patent: 4783696 (1988-11-01), Neumann et al.
patent: 5019703 (1991-05-01), Boyd et al.
patent: 5164858 (1992-11-01), Aguilera, Jr. et al.
patent: 5272518 (1993-12-01), Vincent
patent: 5285271 (1994-02-01), Gennetten
patent: 5300767 (1994-04-01), Steinle et al.
"Designing A Scanner With Color Vision", K. Douglas Gennetten and Michael J. Steinle; Hewlett-Packard Journal; Aug. 1993; pp.52-58.

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