Patent US4624528A successfully refreshed from Google Patents.
US4624528A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Scanning systems with polygon scanner having curved facets
Assignee: Xerox Corp
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Filing: 1985-02-21
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Granted: 1986-11-25
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Expires: 2005-02-21
Abstract
Abstract A raster scanner system having double reflection from polygon facet surfaces which have aspheric curvature. In addition to providing a scan which is free of astigmatism and bow, the aspheric surfaces provide the scan and focus functions of conventional scan lens optics.
Inventors
- 👤 Harry P. Brueggemann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:58
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/08; G02B5/09; G02B26/00; G02B26/08; G02B26/10; G02B26/12; G02B26/129
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
155 words
In a light scanning system including a multi-surface mirror assembly having an axis of rotation, including a light source for introducing a source of light toward said multi-surface mirror assembly, said light being reflected in turn by each of said surfaces of said mirror assembly, a first fixed mirror placed in the path of said reflected light from said multi-surface mirror assembly, a second fixed mirror placed in the path of said reflected light from said first mirror, said second mirror reflecting said light back to the same surface of said rotating multi-surface mirror assembly for a last reflection, said last reflection being a scanning light beam of predetermined range of arc of one rotation of said multi-surface mirror assembly, the improvement comprising said multi-surface mirror assembly comprising a polygonal array of non-planar mirror facets, said mirror facets having a predetermined draft angle with respect to the axis of rotation of said multi-surface mirror assembly.
Claim 2
Dependent Claim
155 words
In a light scanning system including a multi-surface mirror assembly having an axis of rotation, including a light source for introducing a source of light toward said multi-surface mirror assembly, said light being reflected in turn by each of said surfaces of said mirror assembly, a first fixed mirror placed in the path of said reflected light from said multi-surface mirror assembly, a second fixed mirror placed in the path of said reflected light from said first mirror, said second mirror reflecting said light back to the same surface of said rotating multi-surface mirror assembly for a last reflection, said last reflection being a scanning light beam of predetermined range of arc of one rotation of said multi-surface mirror assembly, the improvement comprising said multi-surface mirror assembly comprising a polygonal array of non-planar mirror facets, said mirror facets having a predetermined draft angle with respect to the axis of rotation of said multi-surface mirror assembly.
Claim 3
Dependent Claim
14 words
The scanning system of claim 1 wherein said non-planar mirror facets have aspheric surfaces.
Claim 4
Dependent Claim
19 words
The scanning system of claim 2 wherein said aspheric surfaces are astigmatic with two curvatures in two orthogonal directions.
Claim 5
Dependent Claim
156 words
In a light scanning system a multi-surface mirror assembly having an axis of rotation, including a light source for introducing a source of light toward said multi-surface mirror assembly, said light being reflected in turn by each of said surfaces of said mirror assembly, a first fixed mirror placed in the path of said reflected light from said multi-surface mirror assembly, a second fixed mirror placed in the path of said reflected light from said first mirror, said second mirror reflecting said light back to the same surface of said rotating multi-surface mirror assembly for a last reflection, said last reflection being a scanning light beam of predetermined range of arc of one rotation of said multi-surface mirror assembly, the improvement comprising said multi-surface mirror assembly comprising a polygonal array of mirror facets having aspheric surfaces, said mirror facets having a predetermined draft angle with respect to the axis of rotation of said multi-surface mirror assembly.
Claim 6
Dependent Claim
156 words
In a light scanning system a multi-surface mirror assembly having an axis of rotation, including a light source for introducing a source of light toward said multi-surface mirror assembly, said light being reflected in turn by each of said surfaces of said mirror assembly, a first fixed mirror placed in the path of said reflected light from said multi-surface mirror assembly, a second fixed mirror placed in the path of said reflected light from said first mirror, said second mirror reflecting said light back to the same surface of said rotating multi-surface mirror assembly for a last reflection, said last reflection being a scanning light beam of predetermined range of arc of one rotation of said multi-surface mirror assembly, the improvement comprising said multi-surface mirror assembly comprising a polygonal array of mirror facets having aspheric surfaces, said mirror facets having a predetermined draft angle with respect to the axis of rotation of said multi-surface mirror assembly.
Claim 7
Dependent Claim
14 words
The scanning system of claim 4 wherein said aspheric surfaces are of conicoidal shape.
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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) | 1989-11-24 | 1990-05-26 | 1990-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-24 | 1994-05-26 | 1994-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-24 | 1998-05-26 | 1998-11-25 | $7700.00 | Window Closed / Lapsed |