US5063292A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical scanner with reduced end of scan wobble having an even number of beam reflections
Assignee: Xerox Corp
•
Filing: 1990-04-27
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Granted: 1991-11-05
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Expires: 2010-04-27
Abstract
Abstract An optical scanning system reduces wobble at the ends of the scan line by twice reflecting a laser beam off a facet of a rotating polygon mirror, then passing the beam through a cylindrical scan lens system which will focus the beam in the scan plane to the scan line and then reflecting the beam off a cylindrical mirror to focus the beam in the cross-scan plane to the scan line.
Inventors
- 👤 Harry P. Brueggemann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:24
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/0025; G02B27/0031; G02B26/00; G02B26/08; G02B26/10; G02B26/12; G02B26/129; G02B5/00; G02B5/08; G02B5/09
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
118 words
An optical scanning system for reducing wobble at the ends of a scan line in a scan plane comprising: a rotating polygon having a plurality of facets, a collimated laser beam directed onto one of said facets from a location offset below the scan plane, a mirror system to cause an even number of reflections of said laser beam before said laser beam is reflected off said facet a second time, a cylindrical scan lens system which focuses in the scan plane said laser beam twice reflected off said facet to said scan line, and a cylindrical mirror which focuses in a cross-scan plane said laser beam which has passed through said scan lens system to said line.
Claim 2
Dependent Claim
118 words
An optical scanning system for reducing wobble at the ends of a scan line in a scan plane comprising: a rotating polygon having a plurality of facets, a collimated laser beam directed onto one of said facets from a location offset below the scan plane, a mirror system to cause an even number of reflections of said laser beam before said laser beam is reflected off said facet a second time, a cylindrical scan lens system which focuses in the scan plane said laser beam twice reflected off said facet to said scan line, and a cylindrical mirror which focuses in a cross-scan plane said laser beam which has passed through said scan lens system to said line.
Claim 3
Dependent Claim
29 words
The optical scanning system for reducing wobble at the ends of a scan line in a scan plane of claim 1 wherein said laser beam is elliptical in shape.
Claim 4
Dependent Claim
42 words
The optical scanning system for reducing wobble at the ends of a scan line in a scan plane of claim 2 wherein said elliptical laser beam has the major axis in the scan plane and the minor axis in the cross-scan plane.
Claim 5
Dependent Claim
31 words
The optical scanning system for reducing wobble at the ends of a scan line in a scan plane of claim 1 wherein said laser beam is generated by a laser diode.
Claim 6
Dependent Claim
47 words
The optical scanning system for reducing wobble at the ends of a scan line in a scan plane of claim 1 wherein said cylindrical scan lens system comprises at least one cylindrical scan lens which is cylindrical in the scan plane and plano in the cross-scan plane.
Claim 7
Dependent Claim
36 words
The optical scanning system for reducing wobble at the ends of a scan line in a scan plane of claim 1 wherein said cylindrical mirror is cylindrical in the cross-scan plane and flat in scan plane.
Claim 8
Dependent Claim
29 words
The optical scanning system for reducing wobble at the ends of a scan line in a scan plane of claim 1 wherein said mirror system comprises two flat mirrors.
Claim 9
Dependent Claim
45 words
The optical scanning system for reducing wobble at the ends of a scan line in a scan plane of claim 1 wherein said rotating polygon has an axis of rotation and said facets have a predetermined draft angle with respect to said axis of rotation.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-11-04 | 1995-05-06 | 1995-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-11-04 | 1999-05-06 | 1999-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-11-04 | 2003-05-06 | 2003-11-05 | $7700.00 | Window Closed / Lapsed |