| 摘要 |
The optical path of scanning light E 1 reaching the photosensitive drum 82 a closest to the installation plane S of a plurality of photosensitive drums 82 a , 82 b , 82 c, and 82 d is provided at the photosensitive drum side with respect to the optical path of scanning light E 2 deflected and scanned on the same side as the side of polygon mirror 10 for deflecting and scanning the laser beam, from the polygon mirror 10 to folding mirrors 24, 26. The invention presents a technology capable of equalizing the length of optical paths if the regulation of optical unit in height direction is different at both sides of the rotary polyhedral mirror.
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