US Patent 7796928 Image forming apparatus

An image forming apparatus which can reduce color shift and image blurring caused by increased temperature in the apparatus and form high-quality images without causing an increase in the cost and size of the apparatus. An image sensor unit reads surface patterns of an intermediate transfer belt. A digital signal processor (DSP) controls the movement of the belt in a transverse direction perpendicular to a moving direction thereof based on the surface patterns of the belt read by the image sensor unit.