COLOR IMAGE FORMING DEVICE AND REGISTRATION PATTERN FORMING METHOD

摘要

PROBLEM TO BE SOLVED: To obtain a color image forming device capable of highly accurately forming registration pattern and precisely correcting a color slippage thereby forming an image high in printing quality and a registration pattern. SOLUTION: This color image forming device provided with an image conveying part 7 for carrying the image on the surface and conveying it, image forming parts Pa-Pd for forming the images corresponding to the image information of respective colors on the conveying part 7, a registration pattern forming part 72 for forming the registration patterns of the respective colors on the conveying part 7 by the image forming parts at the time of a color slippage detecting action and a color slippage detection part 13 for detecting the color slippage of the images based on the formed registration patterns is provided with an intermediate transfer belt a conveying irregularity detection part 71 for detecting a conveying irregularity of the image conveying part and outputting a term signal showing a term that the conveying irregularity is small out of the detected conveying irregularity.