Patent ID: 6418295
Filing Date: 2002-07-09
Classification: G03G,H04N

Abstract:
A color image forming apparatus including a plurality of electrophotographic image forming sections arranged along a conveyor belt for forming images, and sequentially transferring said images to a single recording medium being conveyed by said conveyor belt one above the other to thereby form a color image on said recording medium, said color image forming apparatus comprising:register mark forming means for causing each of said image forming sections to form a respective register mark on the conveyor belt; mark sensing means adjoining the conveyor belt for sensing the register mark; correcting means for correcting a deviation between colors in accordance with a result of sensing of the register mark output from said mark sensing means; first storing means for storing past deviations between colors sensed by said mark sensing means, wherein said correcting means executing a correction of a deviation between colors on the basis of the past deviations stored in said first storing means; a recognizing means for recognizing an apparatus condition inside of said apparatus; and second storing means for storing the deviations sensed by said mark sensing means and the apparatus conditions in which said deviations occurred, wherein a timing for executing a sensing operation is determined on the basis of the apparatus condition recognized by said recognizing means and deviations stored in said second storing means in association with past apparatus conditions.