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AssigneeXerox Corporation
InventorsJagdish C. Tandon, Lingappa K. Mestha, Fred F. Hubble, III
Estimating the term…
A color spectrophotometer incorporating a low cost commercial imaging chip, which normally forms part of a document imaging bar used for imaging documents in scanners, etc., having multiple photo-sites with three different rows of color filters. Each chip is mounted on the optical axis of an imaging lens system, in the image plane of that lens system, to image the reflected illumination from an illuminated color test target area on the chip. The optical axis of the imaging lens system is oriented at 45° to the illuminated color test patches, and the photodetector chip is physically mounted perpendicular to the plane of the illuminated color test patches. Respective photo-sensor chips and associated 1:1 optics may be mounted on opposing sides of the spectrophotometer physically oriented at 90° to the test target area plane receiving the reflected light from the test target optically oriented at 45° to the illuminated test target.
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 said spectrophotometer comprises a limited plurality of illumination sources for sequentially illuminating said color test patches with different illumination spectra, a photodetector system, and an associated imaging lens system having an optical axis and an image plane, for providing electrical output signals in response to the color of said test patches from the reflection of a portion of said illumination of said color test patches by said illumination sources through said imaging lens system to illuminate said photodetector system, said photodetector system comprising at least one photodetector chip having a multiplicity of simultaneously so illuminated photo-sites including at least three different sets of simultaneously illuminated photo-sites having at least three different spectral responses providing at least three different said electrical output signals, wherein said photodetector chip is mounted on said optical axis of said imaging lens system and oriented substantially in said image plane of said imaging lens system to image said reflected illumination from said illuminated color test target area surface on said photodetector chip.
A color correction system for a color printer, including a low cost broad color spectrum spectrophotometer including an illumination source mounted to illuminate a color test target area on a printed sheet, an imaging lens system having an optical axis and an image plane, and at least one low cost photodetector chip arranged to receive at least a portion of the light reflected from said illuminated color test target area through said imaging lens system along said optical axis thereof, said photodetector chip being mounted in said image plane of said imaging lens system, said photodetector chip being a component for a commercial colored documents imaging bar, said photodetector chip having at least three rows of small and closely spaced multiple photo-sites with three different respective color filters and electrical outputs, of which at least a portion of each of said three rows of multiple photo-sites are simultaneously exposed to said reflected light from said illuminated color test target area by said imaging lens system so that said photodetector chip can provide at least three different spectral responses with at least three different electrical output signals;
A color correction system for a color printer, including a low cost broad color spectrum spectrophotometer including an illumination source mounted to illuminate a color test target area on a printed sheet, an imaging lens system having an optical axis and an image plane, and at least one low cost photodetector chip arranged to receive at least a portion of the light reflected from said illuminated color test target area through said imaging lens system along said optical axis thereof, said photodetector chip being mounted in said image plane of said imaging lens system, said photodetector chip being a component for a commercial colored documents imaging bar, said photodetector chip having at least three rows of small and closely spaced multiple photo-sites with three different respective color filters and electrical outputs, of which at least a portion of each of said three rows of multiple photo-sites are simultaneously exposed to said reflected light from said illuminated color test target area by said imaging lens system so that said photodetector chip can provide at least three different spectral responses with at least three different electrical output signals;
A color correction system for a color printer, including a low cost broad color spectrum spectrophotometer including an illumination source mounted to illuminate a color test target area on a printed sheet, an imaging lens system having an optical axis and an image plane, and at least one low cost photodetector chip arranged to receive at least a portion of the light reflected from said illuminated color test target area through said imaging lens system along said optical axis thereof, said photodetector chip being mounted in said image plane of said imaging lens system, said photodetector chip being a component for a commercial colored documents imaging bar, said photodetector chip having at least three rows of small and closely spaced multiple photo-sites with three different respective color filters and electrical outputs, of which at least a portion of each of said three rows of multiple photo-sites are simultaneously exposed to said reflected light from said illuminated color test target area by said imaging lens system so that said photodetector chip can provide at least three different spectral responses with at least three different electrical output signals;
Dependencies are inferred from the claim text.