| 摘要 |
PROBLEM TO BE SOLVED: To provide stable and high quality images for a long time without mechanically controlling a mechanical section in an exposing device in an electrophotographic printer having a plurality of rotary polygon mirrors provided in the exposing device. SOLUTION: A paint is partially coated in a rotating direction on a part where the rotary polygon mirror and a driving means for driving to rotate the rotary polygon mirror are coupled with each other. The part is detected by a photosensor. The rotation controlling is executed in such a manner that the output signal of the photosensor is in synchronism with a reference signal generator and a print start reference signal.
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