| 摘要 |
PROBLEM TO BE SOLVED: To reduce the amount of color shift caused by long-period jitter. SOLUTION: This optical system is applicable to an image forming apparatus for carrying out multi-color image formation using a plurality of scanning type optical devices which deflect and scan an optical beam using a rotating polygonal mirror. The image forming apparatus includes, for example, a detecting means for detecting the phase of rotating speed unevenness of rotating polygonal mirrors respectively provided at the plurality of scanning type optical devices, and an adjusting means for adjusting the rotating speed of each rotating polygonal mirror to reduce the phase difference between the phases detected for every rotating polygonal mirror. COPYRIGHT: (C)2009,JPO&INPIT |
