Patent ID: 8285159

Claim:
A color image forming apparatus for forming toner images by carrying out charging, exposure, and development on at least one photoreceptor drum, and forming color images by transferring the toner images via an intermediate transfer member onto a sheet, the color image forming apparatus comprising: a photoreceptor drum which rotates around an axis; an exposure section which intermittently emits a light beam onto the cylindrical surface of the rotating photoreceptor drum along scanning lines parallel to the axis of the photoreceptor drum; a calculation section which calculates a printing ratio of a color image to be formed on the sheet, wherein the printing ratio is the ratio of the area to be covered by toner of the color image within a prescribed area on the sheet; and a timing control section which controls a timing at which the exposure section emits the light beam in a direction of rotation of the photoreceptor drum based on the printing ratio calculated by the calculation section, wherein the timing control section increases a correction amount of the timing at which the exposure section emits the light beam as the printing ratio calculated by the calculation section decreases.