US4407581A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compact optical scanning system
Assignee: Xerox Corp
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Filing: 1982-05-17
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Granted: 1983-10-04
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Expires: 2002-05-17
Abstract
Abstract A compact scan document system is enabled by adding motion to the scanning and projection components used in a folded optical system. A general and preferred velocity relationship is set for the system optical elements and a mechanical drive arrangement is disclosed which enable the specific ratios required. In a preferred embodiment, a pulley/belt system is used to provide four velocities such that a document is scanned at a first velocity V, the document image is reflected to a folding mirror arrangement traveling at 0.75 V and projected by a lens moving at a 0.5 V velocity to a photoreceptor image plane via another folding mirror arrangement moving at a 0.25 V ratio.
Inventors
- 👤 David K. Shogren
- 👤 Robert G. Zambelli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:53
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/04; G03G15/041
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
128 words
A multi-rate scanning system for scanning a document lying in an object plane and projecting an image along an optical path onto a photoreceptor plane, said system including the following optical elements: an illumination/mirror scanning assembly including a first reflective means associated with the illumination means and adapted for movement in the scan direction at a velocity V1 and a second reflective means adapted for movement in the scan direction at a velocity V2; a projection lens lying in a plane parallel to said illumination/mirror assembly and adapted to move in the scan direction at a velocity V3; a third reflective means adapted to move in the scan direction at a velocity V4; and a drive arrangement for driving said optical elements at a velocity relatively whereby V1>V2>V3>V4.
Claim 2
Dependent Claim
128 words
A multi-rate scanning system for scanning a document lying in an object plane and projecting an image along an optical path onto a photoreceptor plane, said system including the following optical elements: an illumination/mirror scanning assembly including a first reflective means associated with the illumination means and adapted for movement in the scan direction at a velocity V1 and a second reflective means adapted for movement in the scan direction at a velocity V2; a projection lens lying in a plane parallel to said illumination/mirror assembly and adapted to move in the scan direction at a velocity V3; a third reflective means adapted to move in the scan direction at a velocity V4; and a drive arrangement for driving said optical elements at a velocity relatively whereby V1>V2>V3>V4.
Claim 3
Dependent Claim
19 words
The scanning system of claim 1 wherein the drive arangement provides a speed ratio of V4=0.25V1; V3=0.5V1 and V2=0.75V1.
Claim 4
Dependent Claim
34 words
The scanning system of claims 1 or 2 wherein said drive arrangement comprises a plurality of timing belts driven by associated timing pulleys at velocities determined by the teeth ratios of the respective pulleys.
Claim 5
Dependent Claim
36 words
The scanning system of claims 1 or 2 wherein said drive arrangement comprises a pulley/cable arrangement wherein various portions of a cable system are driven at velocities determined by the respective diameters of the drive pulleys.
Claim 6
Dependent Claim
75 words
The scanning system of claim 3 wherein said first reflective and illumination means is mounted on a first timing belt driven at a first velocity V1, said sensed reflective means is mounted upon a second timing belt driven at a second velocity V2, said projection lens is mounted upon a third timing belt driven at a velocity V3 and said third reflective means is mounted on a fourth timing belt driven at a velocity V4.
Claim 7
Dependent Claim
33 words
The scanning system of claim 1 wherein said second and third reflective means are corner mirror assemblies, said system further including a fourth reflective means between said third reflective means and said photoreceptor.
Claim 8
Dependent Claim
32 words
The scanning system of claim 1 wherein said second and third reflector means are folding mirrors, and said projection lens is a half-lens incorporating a 90° roof mirror interior to said lens.
Claim 9
Dependent Claim
46 words
The scanning system of claim 1 further including a movable document platen lying in the object plane, said platen movable, during scan, in a direction opposite said scanning assembly at a velocity V5 whereby the absolute sum of V1 and V5 equals the document length L.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-10-03 | 1987-04-04 | 1987-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-03 | 1991-04-04 | 1991-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-03 | 1995-04-04 | 1995-10-04 | $7700.00 | Window Closed / Lapsed |