Patent ID: 6832060
Filing Date: 2004-12-14
Classification: G03G

Abstract:
An image forming apparatus which repeats image create/transfer processing, which is serial processing of forming a toner image on a photosensitive member while rotating said photosensitive member and a transfer medium in a sub scanning direction and thereafter transferring said toner image onto said transfer medium, for a plurality of toner colors which are different from each other, to thereby lay toner images in said respective toner colors over each other on said transfer medium and accordingly form a color image,characterized in correcting transfer start positions of toner images in at least one or more toner colors out of said plurality of toner colors based on a registration control amount which is necessary to correct relative registration deviations among toner images on said transfer medium, and comprising: abutting means which temporarily contacts said transfer medium while said image create/transfer processing is repeated; and control means which corrects transfer start positions of toner images, using as said registration control amount a control amount which is necessary to correct relative registration deviations among toner images on said transfer medium which are created as said abutting means contacts and moves away from said transfer medium, said control means executes registration control amount establish processing before a color image is formed, to thereby identify said registration control amount wherein after forming a color image at least once or more times based on said registration control amount, said control means executes registration control amount correction which is different from said registration control amount establish processing to correct said registration control amount.