Patent ID: 6567170
Filing Date: 2003-05-20
Classification: G01J,G03G

Abstract:
A color correction system for a color printer having an output path for moving printed color sheets, including printed test sheets with printed color test patches, in which a spectrophotometer is mounted adjacent to said printer output path for sensing the colors printed on said printed color test patches on said printed test sheets as said printed test sheets are moving past said spectrophotometer in said output path, and in which at least one illumination source is provided for illuminating said color test patches with different illumination spectra;wherein plural sets of plural small test patches of different colors are printed on said printed test sheets, and wherein a plural number of said plural small test patches of different colors in a said set are simultaneously illuminated by said illumination source, and wherein said spectrophotometer has a photodetector system for providing different electrical signals in response to reflected illumination from said different colors of said plural small test patches of different colors being simultaneously illuminated by said illumination source, wherein said photodetector system comprises at least one photodetector having an photodetecting area with multiple photo-sites including at least three different sets of said photo-sites having different spectral responses.