| 摘要 |
A semiconductor laser array emits n light beams at intervals r. An optical system having a lateral magnification (beta) in the beam arrangement direction forms spots of the n light beams on the photoreceptor. A polygon scanner deflects the n light beams to a direction perpendicular to the beam arrangement direction, to scan the photoreceptor simultaneously with the n light beams. The integer n is selected to be a value not less than 3, and an interlacing period I, which is defined as I=(beta)r/p where p is an interval of adjacent scanning lines on the photoreceptor, is selected to be an integer in the range of 2<=I<=(n-1) and prime to n.
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