Patent ID: 6408155
Filing Date: 2002-06-18
Classification: G03G

Abstract:
A color image forming apparatus, comprisinga photosensitive member on the surface of which an electrostatic latent image can be formed, a plurality of developing units, each having a different color of toner and developing means, a developing unit moving means for switching the plurality of developing units by moving them selectively between an image forming position and other positions, a primary transfer means for overlapping sequentially toner images of many colors, which are formed on the photosensitive member by the plurality of developing units, thereby transferring a color image onto an intermediate transfer member, an intermediate transfer member driving means for driving the intermediate transfer member at a predetermined speed, a secondary transfer means for transferring the color image, which is primary transferred by being overlapped on the intermediate transfer member, onto a printing medium, and a fixing means for fixing the color image, which is transferred on the printing medium, to the printing medium, wherein, in several times of primary transfers of toners of a plurality of colors for forming one sheet of color image, the primary transfer of the toner of the last color is performed at a speed less than that of the toners of the other colors and more than Â½ of that of the toners of the other colors.