Color correction in a color image formation apparatus
AssigneeFuji Xerox Co., Ltd.
InventorsYoshihiko Sakai, Hiroyuki Hotta, Seigo Makida
Life of this patent
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Abstract
When a color image is formed using exposure units, photoconductive drums, developing machines, transfer printing machines and the like, a color patch using each monochrome toner prepared for the above developing machines and a color patch formed by overlapping plural colors of toner are formed on a transfer medium as sample images. After the two types of color patches are fixed by a fixing roll, they are detected by a fixed image density sensor installed after the fixing roll. A control section corrects an image formation condition based upon difference in density between the two types of sample images.
Claims12
A color image formation apparatus in which a color density of a color image formed under a set formation condition is detected and said formation condition is corrected based upon the color density, comprising:
- image formation means for forming said color image according to said formation condition;
- detection means for detecting said color density of said color image;
- and
- control means for correcting said formation condition based upon said color density detected by said detection means;
- said image formation means forming at least one sample image group, each at least one sample image group comprising a first sample image using one of a plurality of color materials for forming said color image independently and a second sample image in which at least two of said plurality of color materials are overlapped;
- said detection means comprising at least one light source, each at least one light source radiating one of red, green and blue detecting light on a respective one of the at least one sample image group, and at least one light receiving section for receiving said detecting light that is reflected from the at least one sample image group according to respective color densities of said first and second sample images;
- and
- said control means correcting said formation condition based upon a difference in said color density of the corresponding color between said first and second sample images.
A color image formation apparatus for detecting a color density of a color image formed under a set formation condition of a color image and correcting said formation condition based upon the color density, comprising:
- image formation means for forming said color image under said formation condition;
- detection means for detecting said color density of said color image;
- and
- control means for correcting said formation condition based upon said color density detected by said detection means, wherein said image formation means forms at least one sample image group comprising a first sample image using at least one of a plurality of color materials for forming a color image independently and a second sample image in which at least two of said color materials are overlapped;
- said detection means having at least one light source, each at least one light source radiating one of red, green and blue detecting light on a respective one of the at least one sample image group, and at least one light receiving section for receiving said detecting light that is reflected from the at least one sample image group according to respective color densities of said first and second sample images;
- and
- said control means correcting said formation condition based upon a difference between said color density of said first sample image and a target value and also correcting said formation condition based upon a difference in said color density of the corresponding color between said first sample image and said second sample image.
Dependencies are inferred from the claim text.