Patent ID: 9110398
Filing Date: 2015-08-18
Classification: G03G

Abstract:
1. A multi pass type color image forming apparatus comprising: a photoconductor; an exposure unit to irradiate to a surface of the photoconductor to form an electrostatic latent image on the photoconductor; a plurality of developers to develop the electrostatic latent image formed on the photoconductor to form developing agent images on the photoconductor; an intermediate transfer belt to which the developing agent images formed on the photoconductor are transferred; a cleaning unit to come into contact with the intermediate transfer belt to remove developing agent wastes; a position recognition part formed on the intermediate transfer belt; a position sensing unit to sense the position recognition part; a motor to rotate the intermediate transfer belt; and a controller to control the exposure unit based on a sensing signal generated when the position sensing unit senses the position recognition part, wherein the controller controls velocity of the motor in an exposure section of second and subsequent colors to be lower than reference velocity of the motor in an exposure section of a first color to correct a color registration error between a developing agent image of the first color and developing agent images of the subsequent colors of a page caused by a change in rotational velocity of the intermediate transfer belt due to contact with the cleaning unit.