Light scanning apparatus

A light scanning apparatus comprising:

• beam emitting means for emitting a light beam;
• a multi-facet rotary mirror having a plurality of reflective facets for reflecting the light beam emitted from the beam emitting means and rotatable for scanning the light beam reflected on the reflective facets over a scanning object;
• an incident optical system for shaping the light beam emitted from the beam emitting means to allow the light beam to have a greater width than a width of each of the reflective facets of the multi-facet rotary mirror as measured in a scanning direction for overfilled facet illumination and directing the light beam to the multi-facet rotary mirror;
• and
• an fθ lens provided in a path of the light beam extending from the multi-facet rotary mirror to the scanning object, the fθ lens having two end sides;
• wherein the incident optical system comprises deflection means provided between the fθ lens and the scanning object for deflecting the light beam emitted from the beam emitting means toward the multi-facet rotary mirror so as to cause the light beam deflected by the deflection means to pass through an end portion of the fθ lens reach the multi-facet rotary mirror, the end portion being at a location which is closer to one of the end sides than to a middle of the fθ lens.