Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Reexamination Certificate
2006-11-07
2006-11-07
Luu, Thanh X. (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
C356S406000
Reexamination Certificate
active
07132644
ABSTRACT:
The invention is directed to a photosensor for color measurement based on three spectral components, particularly for highly accurate color measurement for testing and guaranteeing color constancy in engineered surfaces and consumer articles of any kind. The object of the invention, to find a novel possibility for color measurement based on a three-range method with color measurement values generated by preceding interference filters with different spectral responses which permits a virtually true-color measurement in conformity with standards in a simple manner without costly reference light calibration, is met according to the invention in that the photosensor comprises at least three partial surfaces which are covered by different interference filters adapted to the X-, Y- and Z-spectral characteristic of the human eye, each partial surface being arranged so as to be uniformly distributed in a sector-shaped manner and so as to cover the same area around a center with passivated webs located therebetween, and every partial surface is provided with an interference filter whose transmission characteristic over the wavelength of the light to be measured spectrally is adapted to the response of the human eye, wherein the spectral components passed by the interference filters approximate the normal spectral value functions of the human eye in color coordinates of the color space.
REFERENCES:
patent: 3996461 (1976-12-01), Sulzbach et al.
patent: 4562356 (1985-12-01), Auth
patent: 5246803 (1993-09-01), Hanrahan
patent: 5272518 (1993-12-01), Vincent
patent: 5680220 (1997-10-01), Delignieres
patent: 6133954 (2000-10-01), Jie
patent: 6707556 (2004-03-01), Turner
Grunert Fred
Krumbein Frank
Siess Gunter
Ko Tony
Luu Thanh X.
MAZeT GmbH
Reed Smith LLP
LandOfFree
Photo sensor for standardized color measurement does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Photo sensor for standardized color measurement, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Photo sensor for standardized color measurement will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3678550