US4629283A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical flat bed scanning system
Assignee: Heidelberger Druckmaschinen AG
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Filing: 1985-01-31
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Granted: 1986-12-16
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Expires: 2005-01-31
Abstract
Abstract An optical flat bed scanning system, particularly useable in a typesetter, has an optical device to linearize beam deflection positions in a planar deflection plane with essentially two elements. The optical device comprises an aplanatic unit lens with an approximately planar surface and a spherically convex surface and a field flattening mirror with a spherical reflecting surface.
Inventors
- 👤 Michael Plaot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:13
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/0025; G02B27/0031; B; B41; B41B; B41B21/00; B41B21/16; B41J; B41J2/00; B41J2/435; B41J2/47; B41J2/471
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
169 words
In an opto mechanical deflector employed to focus a parallel light beam onto a flat image plane, the deflector being of the type comprising at least one rotating scan mirror onto which the light beam impinges, is reflected and focused onto a flat image plane by reflection off a concave mirror positioned in proximity to the flat image plane, the improvement wherein a lens having a flat surface and a convex curved surface is positioned in the path of light reflected from the rotating scan mirror, between the scan mirror and the concave mirror, with the flat surface thereof facing the scan mirror and the curved surface facing the concave mirror and of a curvature such that the flat surface refracts the beam impinging thereon in a manner such that the beam exiting the lens is substantially perpendicular to the curved surface, whereby for a given resolution and line length the angle of deflection of the scan mirror is increased and the optical lever to the image plane shortened.
Claim 2
Dependent Claim
169 words
In an opto mechanical deflector employed to focus a parallel light beam onto a flat image plane, the deflector being of the type comprising at least one rotating scan mirror onto which the light beam impinges, is reflected and focused onto a flat image plane by reflection off a concave mirror positioned in proximity to the flat image plane, the improvement wherein a lens having a flat surface and a convex curved surface is positioned in the path of light reflected from the rotating scan mirror, between the scan mirror and the concave mirror, with the flat surface thereof facing the scan mirror and the curved surface facing the concave mirror and of a curvature such that the flat surface refracts the beam impinging thereon in a manner such that the beam exiting the lens is substantially perpendicular to the curved surface, whereby for a given resolution and line length the angle of deflection of the scan mirror is increased and the optical lever to the image plane shortened.
Claim 3
Dependent Claim
20 words
A deflector according to claim 1, wherein the lens is positioned for being traversed twice by a beam of light.
Claim 4
Dependent Claim
37 words
A deflector according to claim 1 or 2, wherein at least one dispersive lens is positioned in the entrance ray path to the lens in the direction toward the rotating scan mirror for compensating for spherical aberration.
Claim 5
Dependent Claim
57 words
A deflector according to claim 1 or 3, wherein a plane mirror is mounted in the vicinity of the concave mirror, and wherein sag of the line in the image plane due to oblique impingement of the beam onto these two mirrors is compensated for by tilting of the rotating or slewing axis of the scanning mirror.
Claim 6
Dependent Claim
15 words
A deflector according to claim 4, wherein said image plane comprises a light sensitive light.
Claim 7
Dependent Claim
26 words
A deflector according to claim 5 wherein lens has a ratio of curvature radius of the curved surface to the plane surface of at least 5:1.
References Cited (Backward Citations)
DE1154656B
Cited
US3469030A
Cited
FR2195801A1
Cited
FR2244185A1
Cited
US4002830A
Cited
DE2601327A1
Cited
US4179183A
Cited
US4274703A
Cited
DE2911528A1
Cited
US4383755A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-12-15 | 1990-06-16 | 1990-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-15 | 1994-06-16 | 1994-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-15 | 1998-06-16 | 1998-12-16 | $7700.00 | Window Closed / Lapsed |