Patent ID: 7817947
Filing Date: 2010-10-19
Classification: G03G

Abstract:
1. An image forming apparatus that corrects color misregistration of an image to be formed on a recording medium comprising: a conveyance device for conveying the recording medium; an image forming device having an endless image carrier for carrying an image to be formed on the recording medium, wherein the image forming device forms the image in an image area that corresponds to the recording medium on the image carrier and also forms a color misregistration correction mark in an image boundary area that is sandwiched between the image area and the next image area following the image area on the image carrier; a mark detecting section for detecting the color misregistration correction mark formed on the image boundary area of the image carrier by the image forming device; and a control device for providing control in such a way that the color misregistration of the image formed on the recording medium is controlled based on the color misregistration correction mark detected by the mark detecting section; wherein, under a color misregistration correction mode in which operations of forming the image in the area based on input image information, forming the color misregistration correction mark on the image boundary area of the image carrier, and correcting the color misregistration based on the color misregistration correction mark are executed, the control device controls the conveyance device in such a way that an interval for feeding the recording medium is changed, based on a fluctuating period of the color misregistration corresponding to an orbiting distance of the image carrier, and controls the image forming device in such a way that the image boundary area of the image carrier is expanded, and the color misregistration correction mark is formed at a position changed.