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US5486694A
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Wobble correction and focusing optical element with refractive toroidal surface and binary diffractive optical surface
Assignee: Xerox Corp
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Filing: 1994-12-02
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Granted: 1996-01-23
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Expires: 2014-12-02
Abstract
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.
Inventors
- 👤 Ellis D. Harris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:54
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/42; G02B27/4205; G02B27/4216; G02B27/0025; G02B27/0031; G02B27/0037; G02B27/4227
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
86 words
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, 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.
Claim 2
Dependent Claim
86 words
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, 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.
Claim 3
Dependent Claim
50 words
The optical scanning system for wobble correction and focusing a light beam at a scan line of claim 1 wherein said refractive toroidal lens surface is a toric lens and said binary diffractive optical surface is on the flat surface of said toric lens opposite said refractive toroidal lens surface.
Claim 4
Dependent Claim
107 words
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, 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.
Claim 5
Dependent Claim
107 words
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, 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.
Claim 6
Dependent Claim
84 words
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, 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.
Claim 7
Dependent Claim
84 words
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, 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.
Claim 8
Dependent Claim
65 words
The optical scanning system for wobble correction and focusing a light beam at a scan line of claim 4 wherein the binary diffractive optical surface of said binary diffractive optical lens is in a recess and further comprising bonding means for securing said binary diffractive optical surface of said binary diffractive optical lens in a recess to a plano surface of said refractive toric lens.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1999-01-22 | 1999-07-24 | 2000-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-01-22 | 2003-07-24 | 2004-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-01-22 | 2007-07-24 | 2008-01-23 | $7700.00 | Window Closed / Lapsed |