| 摘要 |
PROBLEM TO BE SOLVED: To uniform all line intervals in a toner image in the case of using a multibeam system exposure device, in an image forming apparatus.SOLUTION: A print engine 11 controls an exposure device 2, forms a toner patch image from one (the fourth beam, for example) of N pieces (N=4, for example) of beams onto an intermediate transfer belt, forms the next toner patch image from the other one (the first beam, for example) of the N pieces of beams, and controls rotation speed of photoreceptor drums 1a-1d so that line intervals in a sub scanning direction in the toner image become uniform, based on the difference of passage time of two patch images at a prescribed detection position and liner speed of the intermediate transfer belt 4. |
