CPC G03G 15/043 (2013.01) [G02B 26/125 (2013.01)] | 20 Claims |
1. An apparatus comprising:
a deflecting unit configured to deflect a light flux from a light source to scan a scanned surface in a main scanning direction; and
an imaging optical system configured to guide the deflected light flux to the scanned surface,
wherein a width of the light flux is larger than the width of a deflecting surface of the deflecting unit in a main scanning cross section when the light flux is incident on the deflecting surface,
wherein a refractive power in the main scanning cross section of the imaging optical system is different between a first position through which an on-axis light flux passes and a second position through which an outermost off-axis light flux passes, and
wherein a first region at one side is longer than a second region at the other side with respect to an optical axis of the imaging optical system on the scanned surface.
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