Wobble correction and focusing optical element with refractive toroidal surface and binary diffractive optical surface
First Claim
Patent Images
1. An optical scanning system for wobble correction and focusing a light beam at a scan line comprising:
- a rotating polygon mirror with a plurality of facets,means for generating a collimated light beam directed onto one of said facets, andan optical element which focuses said light beam reflected off said one of said facets to a scan line and corrects for wobble of said light beam at said scan line, said optical element comprising a binary diffractive optical surface and a refractive toroidal lens surface.
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Abstract
A wobble correction and focusing optical element for a raster optical scanner combines a toric lens, which provides most of the optical power for focusing the light beam to a scan line, with a binary diffractive optical surface, which corrects the field curvature of the toric lens and which also linearizes the scan. The diffractive surface will have a multi-level structure (binary diffractive optical surface) which possesses a diffractive phase function that will flatten the field curvature of the toric lens.
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Citations
5 Claims
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1. An optical scanning system for wobble correction and focusing a light beam at a scan line comprising:
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a rotating polygon mirror with a plurality of facets, means for generating a collimated light beam directed onto one of said facets, and an optical element which focuses said light beam reflected off said one of said facets to a scan line and corrects for wobble of said light beam at said scan line, said optical element comprising a binary diffractive optical surface and a refractive toroidal lens surface. - View Dependent Claims (2)
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3. An optical scanning system for wobble correction and focusing a light beam at a scan line comprising:
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a rotating polygon mirror with a plurality of facets, means for generating a collimated light beam directed onto one of said facets, and an optical element which focuses said beam reflected off said one of said facets to a scan line and corrects for wobble of said light beam at said scan line, said optical element comprising a binary diffractive optical lens and a refractive toric lens, and bonding means for securing a plano surface of said binary diffractive optical lens to a plano surface of said refractive toric lens.
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4. An optical scanning system for wobble correction and focusing a light beam at a scan line comprising:
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a rotating polygon mirror with a plurality of facets, means for generating a collimated light beam directed onto one of said facets, and a lens system which focuses said beam reflected off said one of said facets to a scan line and corrects for wobble of said light beam at said scan line, said lens system comprising a binary diffractive optical lens and a refractive toric lens. - View Dependent Claims (5)
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Specification