| 摘要 |
An optical scanning device includes: a light source; an optical deflecting unit that deflects a light beam emitted from the light source to scan on a scanning surface in main-scanning direction; and a scanning optical system that includes a first scanning lens and a second scanning lens that converge the light beam that is deflected onto the scanning surface. Distance between an exit surface of the first scanning lens and an incident surface of the second scanning lens is shorter than distance between a deflection facet of the optical deflecting unit and an incident surface of the first scanning lens, an exit surface of the second scanning lens is nearer to the deflection facet than a midpoint between the deflection facet and the scanning surface, and an image-surface-side principal point of the scanning optical system in sub-scanning direction is nearer to the scanning surface than the midpoint. |
