Light scanning apparatus and image forming apparatus including the same
AssigneeCanon Kabushiki Kaisha
InventorKazumi Kimura
Life of this patent
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Abstract
An apparatus includes a deflecting unit deflecting a light flux from a light source to scan a scanned surface in a main scanning direction, and an imaging optical system guiding the deflected light flux the scanned surface. A width of the light flux is larger than that of a deflecting surface of the deflecting unit in a main scanning cross section when it is incident on deflecting surface. A refractive power in 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. 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.
Claims20
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.
Dependencies are inferred from the claim text.