Wobble correction lens with binary diffractive optic surface and refractive cylindrical surface
AssigneeXerox Corporation
InventorPatrick Y. Maeda
Life of this patent
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Abstract
A wobble correction lens for a raster output scanner combines a positive cross-scan plano-cylindrical lens, which provides most of the optical power for focusing the light beam to a scan line, with a diffractive surface, which corrects the cross-scan field curvature of the cross-scan plano-cylindrical lens. The diffractive surface will have a multi-level structure (binary diffractive optical surface) which possesses a diffractive phase function that will flatten the cross-scan field curvature of the plano-cylindrical lens.
Claims26
An optical scanning system for correction of wobble and correction of cross-scan field curvature comprising:
- a rotating polygon mirror with a plurality of facets,
- means for generating a collimated laser beam directed onto one of said facets,
- a lens which focuses said beam reflected off said one of said facets to a scan line, said lens comprising a binary diffractive optic lens surface and a refractive cylindrical surface to correct for wobble of said beam at said scan line and to correct the cross-scan field curvature of said beam at said scan line.
An optical scanning system for correction of wobble and correction of cross-scan field curvature comprising:
- a rotating polygon mirror with a plurality of facets,
- means for generating a collimated laser beam directed onto one of said facets,
- a lens which focuses said beam reflected off said one of said facets to a scan line, said lens comprising a binary diffractive optic-plano lens, a refractive plano-cylindrical lens, and bonding means for securing said plano surface of said binary diffractive optic-plano lens to said plano surface of said refractive plano-cylindrical lens;
- said lens to correct for wobble of said beam at said scan line and to correct the cross-scan field curvature of said beam at said scan line.
An optical scanning system for correction of wobble and correction of cross-scan field curvature comprising:
- a rotating polygon mirror with a plurality of facets,
- means for generating a collimated laser beam directed onto one of said facets,
- a lens system which focuses said beam reflected off said one of said facets to a scan line, said lens system comprising a binary diffractive optic-plano lens, and a refractive plano-cylindrical lens;
- said lens system to correct for wobble of said beam at said scan line and to correct the cross-scan field curvature of said beam at said scan line.
Dependencies are inferred from the claim text.