| 摘要 |
An image scanning and recording method and apparatus for compensating for a pyramidal error of a rotating body having at least two reflective mirror surfaces by fine-adjusting an angle of a light beam incident on the rotating body. A scanning lens having a scanning characteristic of fxsin theta is provided on an optical path of the light beam reflected on the rotating body in such a manner that an optical axis of the scanning lens is substantially orthogonal to a rotating axis of the rotating body. The angle of the light beam incident on the rotating body is deflected by a deflecting device within a plane including the rotating axis and the optical axis for each reflective mirror surface based on an equation: sin alpha =cos axsin 2 delta xcos(i+ DELTA )-cos 2 delta xsin(i+ DELTA ) wherein alpha : an angle made of the light beam reflected on the rotating body and a plane including the optical axis and being orthogonal to the rotating axis, delta : a pyramidal error of each reflective mirror surface of the rotating body, i+ DELTA : an angle made of the light beam incident on the rotating body and the optical axis, DELTA : an angle of the light beam deflected by the deflecting device, and a: an angle made of a normal line of each reflective mirror surface and the optical axis when there is no pyramidal error.
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