Color image forming apparatus having an adjustor which corrects the position of a latent image according to registration marks

摘要

A color image forming apparatus in which at least one registration mark is formed on a movable image retainer, and exposed by an exposing device. A position of the registration mark is detected by a detecting device and a signal is generated based on the detected position of the registration mark. An exposing position of the exposing device is corrected by a correcting device in accordance with the signal to form a latent image on the image retainer.