Optics: measuring and testing – By shade or color
Reexamination Certificate
2006-10-13
2008-12-16
Evans, F. L (Department: 2877)
Optics: measuring and testing
By shade or color
C356S073000
Reexamination Certificate
active
07466417
ABSTRACT:
For the color measurement of samples printed on a substrate including a brightener, a raw spectral reflection factor of the sample is measured in a first measurement by illumination of the sample with light without UV portion. In a second measurement, a fluorescence spectrum of the sample is measured by illumination of the sample with only UV light. The measured fluorescence spectrum is recalculated as a corrected fluorescence spectrum by weighting with spectrally dependent correction factors and, finally, the measured raw spectral reflection factor and the corrected fluorescence spectrum are added to form a corrected spectral reflection factor from which the values characterizing the color of the sample are then calculated. The spectral correction factors are determined during the device manufacture for a certain set of light types and stored in the device.
REFERENCES:
patent: 4699510 (1987-10-01), Alguard
patent: 5636015 (1997-06-01), Imura et al.
patent: 6020959 (2000-02-01), Imura
patent: 2002/0135768 (2002-09-01), Sugiyama et al.
patent: 2003/0169421 (2003-09-01), Ehbets
European Search Report dated Feb. 27, 2006.
Ehbets Peter
Frick Beat
von Orelli Adrian
Wegmüller Mark
Evans F. L
McCarter & English LLP
X-Rite Europe GmbH
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