| 摘要 |
A scanning optical apparatus includes a first optical element for converting a state of light beam emitted from a light source into another state, a second optical element for converting the light beam from the first optical element into a line image elongated in a main scanning direction, a deflecting element for deflecting and scanning the light beam from the second optical element, and a scanning optical element for forming an image of the light beam deflected by the deflecting element on a surface to be scanned with a spot-like shape. A deflecting surface of the deflecting element and the surface to be scanned are nearly conjugate in a sub scanning cross section. The position where the wave aberration in the sub scanning cross section of the light beam on an optical axis in the deflected light beam becomes least is located on the side of the deflecting element with respect to the surface to be scanned.
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