EP0494105A2
Expired / Lapsed
EP
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Method and apparatus for transverse image registration on photoreceptive belts
Assignee: Xerox Corp
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Filing: 1992-01-02
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Granted: —
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Expires: 2012-01-02
Abstract
Abstract A method and apparatus for transverse registration of image exposures on photoreceptive belts (12) subject to lateral deviation from linear travel in which targets (T₁, T₂, T₃), corresponding in location to the image areas (l₁, l₂, l₃) to be exposed, are used for the detection of lateral belt displacement and to control the transverse location of exposure scan. The targets are of a pattern defining a reference line and a line inclined with respect to the direction (18) of belt travel so that the duration of time between passage of the target lines with respect to a spacially fixed sensing axis in a sensor (36) will vary with lateral displacement of the belt. The targets may assume a variety of specific patterns and the invention is applicable to single and multi-pass image exposure systems as well as to both modulated laser and light emitting diode types of exposure devices.
Inventors
- 👤 Lam Fun Wong
- 👤 Jacob N. Kluger
- 👤 Stephen C. Arnone
- 👤 Ssujan Hou
- 👤 William J. Nowak
- 👤 Lloyd W. Durfey
- 👤 Daniel W. Costanza
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 18:12
CPC Classifications
G; G06; G06T; G06T3/00; G06T3/06; G06T3/073; G03; G03G; G03G15/00; G03G15/01; G03G15/0142; G03G15/0147; G03G15/0178; G03G15/0194; G03G15/75; G03G15/754; G03G15/755; H; H04; H04N; H04N1/00; H04N1/04; H04N1/047; H04N1/053; H04N1/46; H04N1/50; H04N1/506; G03G2215/00; G03G2215/00135; G03G2215/00139; G03G2215/00143; G03G2215/00156; G03G2215/0016; G03G2215/00164; H04N1/113; H04N1/1135; H04N1/12; H04N1/19; H04N1/191; H04N1/192; H04N1/193; H04N2201/00; H04N2201/04; H04N2201/047; H04N2201/04701; H04N2201/0471; H04N2201/04715; H04N2201/04722; H04N2201/04732; H04N2201/04749; H04N2201/04753; H04N2201/04755; H04N2201/04758; H04N2201/04767; H04N2201/04781; H04N2201/04786; H04N2201/04787
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
89 words
Apparatus for transverse registration of an image area (l₁) to be exposed on a longitudinally moving belt (12) subject to lateral deviation from linear travel, said apparatus comprising: means for defining a target (T₁) in a fixed position on the belt; means (36) for detecting the lateral position of said target in relation to a spacially fixed reference point during movement of the belt; and means (32) for adjusting the transverse location of the image area on the belt in relation to the detected lateral position of said target.
Claim 2
Dependent Claim
21 words
The apparatus recited in claim 1 wherein said means for defining said target comprises a pattern of apertures in said belt.
Claim 3
Dependent Claim
31 words
The apparatus recited in claim 2 wherein said pattern of apertures establishes a linear edge inclined (54) at an angle to the direction of belt travel and a reference edge (50).
Claim 4
Dependent Claim
44 words
The apparatus recited in claim 3 wherein said detecting means includes timing means for measuring the time of belt travel between said inclined edge (54) and said reference edge (50) and means (32) for converting the measured time to a value of lateral displacement.
Claim 5
Independent Claim
49 words
The apparatus recited in any one of claims 1-4 in which said detecting means (36) comprises illumination means (42), photodetector means (44) and means (38, 40) for supporting said illumination means and said photodetector means on opposite sides of the belt and aligned on a common sensing axis (45).
Claim 6
Dependent Claim
121 words
Apparatus for multiple image exposures of an image area (l₁, l₂, etc) on a longitudinally moving belt (12) subject to lateral deviation from linear travel, said apparatus comprising: transverse scanning means (26, 28, or 76) for exposing the image area (l₁, l₂, etc); means defining a target (T₁, T₂, etc) on the belt in a position relative to the image area; means (36) for detecting the lateral position of said target for each of the image exposures, and means (32) for adjusting said transverse scanning means for each of the image exposures in response to the detected lateral position of said target to assure transverse registration of said image exposures irrespective of the lateral position of the belt during each exposure.
Claim 7
Dependent Claim
52 words
The apparatus recited in claim 6 wherein said transverse scanning means (26, 28, or 76) comprises means for projecting an image line segment to a transverse line of scan on the belt, said means for adjusting said transverse scanning means comprising means for shifting the end points of said line of scan.
Claim 8
Dependent Claim
20 words
The apparatus recited in claim 7 wherein said means for projecting an image line segment comprises a modulated laser (28).
Claim 9
Dependent Claim
46 words
The apparatus recited in claim 7 wherein said means for projecting an image light comprises a linear array of light emitting diodes (76), and said means (82, 84) for adjusting said transverse scanning means comprises means for physically shifting said linear array of light emitting diodes.
Claim 10
Independent Claim
88 words
A method for transverse registration of an image area (l₁) to be exposed on a longitudinally moving belt (12) subject to lateral deviation from linear travel, said method comprising the steps of: providing a target (T₁) in a fixed position on the belt; detecting (36) the lateral position of said target during movement of the belt; and adjusting (32) the transverse location of the image area on the belt to compensate for the distance between the detected lateral position of said target and a spacially fixed reference point.
References Cited (Backward Citations)
No citation records indexed.
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