Optical scanning apparatus and image forming apparatus
AssigneeRicoh Company, Ltd.
InventorsHiromichi Atsuumi, Yukio Itami
Life of this patent
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Abstract
An optical scanning apparatus includes a light source that emits a light beam, optical systems through which the light beam travels including one that forms a line image, a polygon mirror that rotates and deflects the light beam with a deflective reflection surface, and a scanning optical system that converges the light beam to scan a target surface with a light beam spot. The optical system closer to the light source than the polygon mirror is configured so as to correct a change in an image-forming position of the light beam spot caused by deformation of the deflective reflection surface originating from the rotation of the polygon mirror.
Claims13
An optical scanning apparatus comprising:
- a light source that emits a light beam;
- a coupling optical system that receives the light beam from the light source and converts the light beam into a specific form;
- a line-image forming optical system that receives the light beam from the coupling optical system and forms a line image elongated in a main scanning direction;
- a polygon mirror that rotates, wherein the polygon mirror receives the light beam from the line-image forming optical system and deflects the light beam, the polygon mirror including a deflective reflection surface near an image-forming position at which the line image is formed;
- and
- a scanning optical system that receives the light beam from the polygon mirror and converges the light beam as a light beam spot onto a target surface to be scanned, and optically scans the target surface with the light beam spot, wherein
- at least one of the optical systems closer to the light source than the polygon mirror is configured so as to correct a change in an image-forming position of the light beam spot caused by deformation of the deflective reflection surface originating from the rotation of the polygon mirror.
Dependencies are inferred from the claim text.