Patent ID: 7647015
Filing Date: 2010-01-12
Classification: G03G

Abstract:
1. A color image forming apparatus comprising: a plurality of image forming units that form a plurality of color-component images; a recording material conveyance unit that conveys a recording material to locations corresponding to the respective image forming units; a color-shift-detection-image forming unit that selectively forms a color-shift detection image on the recording material or the recording material conveyance unit at the respective image forming units; a color-shift detector for detecting a color shift based on the color-shift detection image, which is selectively formed on the recording material or the recording material conveyance unit by the color-shift-detection-image forming unit; a recording-material color-shift correcting unit that corrects a color-shift based on color-shift detection information on the recording material detected by the color shift detector; and a conveyance-unit color-shift correcting unit that performs based on the color-shift detection information on the recording material conveyance unit detected by the color-shift detector after the color-shift correction by the recording-material color-shift correction unit as a reference, color-shift correction based on an amount of change of subsequent color-shift detection information on the recording material conveyance unit, which is obtained by the color-shift detector from the reference.