Color image forming apparatus having means for properly superimposing image colors on each other

摘要

An image forming apparatus using a plurality of laser beams having the same characteristic in order to form a predetermined color image. The predetermined color image consists of a plurality of image colors. The laser beams are shifted with respect to each other in a vertical scanning direction by a diameter of each laser beam divided by the number of the laser beams. Since a rotating of a polygon mirror which deflects the laser beams is asynchronous with a rotating of a photosensitive body on which each laser beam is radiated so as to form a latent image, image colors are shifted with respect to each other. According to the present invention, one of the laser beams is selected for each image color, based on a timing difference between the polygon mirror and the photosensitive body, so that image colors can be superimposed on each other.