| 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 the characteristic of the optical element. <IMAGE> |
