Patent ID: 6690471
Filing Date: 2004-02-10
Classification: G01J,G03G,H04N

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 a limited plurality of different illumination sources are provided for sequentially illuminating said color test patches with different illumination spectra, and a photodetector system for providing electrical output signals in response to the color of said test patches from said sequential illumination of said test patches by reflection of said illumination of said color test patches to illuminate said photodetector system: said photodetector system including at least three different sets of multiple simultaneously illuminated photo-sites having at least three different spectral responses providing at least three different said electrical output signals.