| 摘要 |
A scanning optical apparatus includes a semiconductor laser as a light source, a deflector for deflecting a light beam emitted from the semiconductor laser, and optical element for directing the light beam emitted from the semiconductor laser to a surface to be scanned. The optical element includes a refracting porion and a diffracting portion, wherein changes in the focus in the main scanning direction, resulting from the environmental fluctuations, of the scanning optical apparatus are corrected by a characteristic of the optical element.
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