| 摘要 |
PROBLEM TO BE SOLVED: To provide an image forming device which form an image of good image quality by preventing a position shift when toner images of respective colors are superposed each other to form the color image. SOLUTION: The color image forming device 1 mechanically drive and rotate a photosensitive body 2 and an intermediate transfer belt 31 in one body and is provided with a reference mark for positioning the toner images of the respective colors when the images are superposed and a belt mark sensor 39 which detects the reference mark and outputs a mark detection signal on the side of the intermediate transfer belt 31; and a synchronous detector detects the write-out position of the 1st laser light among a plurality of laser lightbeams and the rotation target positions of the photosensitive body 2 and intermediate transfer belt 31 are changed and controlled according to the phase relation between a synchronous detection signal and a mark detection signal. Therefore, position shifts of the laser lightbeams can be suppressed to one line or below without switching the write-out order of the laser lightbeams emitted by LDs 51a and 51b, and gray-coloring can be prevented. |
