| 摘要 |
Disclosed is a scanning optical system, which is provided with a light source, a deflector, which deflects a beam emitted from said light source, and a scanning lens for converging the beam deflected by said deflector onto a surface to be scanned. The scanning lens has a positive power as a whole, and includes a plurality of refraction lens elements. Further, a diffraction lens structure is formed on at least one surface of one of the plurality of lens elements. Combination of the refraction lens elements and the diffraction lens structure compensates a lateral chromatic aberration caused by the refraction lens elements.
|
