Patent US4098552A successfully refreshed from Google Patents.
US4098552A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copying machine
Assignee: Xerox Ltd
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Filing: 1977-04-12
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Granted: 1978-07-04
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Expires: 1997-04-12
Abstract
Abstract A copying apparatus with a reciprocating platen is disclosed having an improved illumination system. The system includes a regulator that maintains an illumination source at an optimum value by turning the illumination source on during forward scan of the platen and off during reverse movement of the platen. The regulator thereby prevents overheating of the illumination source which would reduce illumination output and thereby interfere with copy quality.
Inventors
- 👤 Yasutoshi Okukawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:01
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
105 words
In an electrostatic copying apparatus having a photosensitive member adapted to receive an electrostatic image, a platen and an illumination means for exposing an original document on said platen, the improvement comprising: regulator means for preventing overheating of said illumination means and stabilizing the light output thereof; wherein said platen and said illumination means are relatively movable to provide a forward imaging scanning direction and a reverse non-imaging scanning direction; and wherein said regulator means comprises means for turning off said illumination means during movement through said reverse non-imaging scanning direction and turning on said illumination means during movement through said forward imaging scanning direction.
Claim 2
Dependent Claim
105 words
In an electrostatic copying apparatus having a photosensitive member adapted to receive an electrostatic image, a platen and an illumination means for exposing an original document on said platen, the improvement comprising: regulator means for preventing overheating of said illumination means and stabilizing the light output thereof; wherein said platen and said illumination means are relatively movable to provide a forward imaging scanning direction and a reverse non-imaging scanning direction; and wherein said regulator means comprises means for turning off said illumination means during movement through said reverse non-imaging scanning direction and turning on said illumination means during movement through said forward imaging scanning direction.
Claim 3
Dependent Claim
42 words
The improvement of claim 1 including means for heating said illumination means and means for turning said heating means on during movement through said forward imaging scanning direction and turning off said heating means during movement through said reverse non-imaging scanning direction.
Claim 4
Dependent Claim
13 words
The improvement of claim 2 wherein said illumination means is a fluorescent tube.
Claim 5
Independent Claim
76 words
A method of stabilizing light output from an illumination source that exposes an original document in a copying machine having a reciprocating platen that is transported between a forward scan imaging direction and reverse non-imaging scanning direction, comprising the steps of: a. turning on said illumination source when the platen is moving in said forward scanning imaging direction; and b. turning off said illumination source when said platen is moving in said reverse non-imaging scanning direction.
Claim 6
Independent Claim
76 words
A method of stabilizing light output from an illumination source that exposes an original document in a copying machine having a reciprocating platen that is transported between a forward scan imaging direction and reverse non-imaging scanning direction, comprising the steps of: a. turning on said illumination source when the platen is moving in said forward scanning imaging direction; and b. turning off said illumination source when said platen is moving in said reverse non-imaging scanning direction.
Claim 7
Dependent Claim
23 words
The method of claim 4 including the step of heating said illumination source only during platen movement through said forward scanning imaging direction.
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) | 1981-07-03 | 1982-01-02 | 1982-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-03 | 1986-01-02 | 1986-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-03 | 1990-01-02 | 1990-07-04 | $7700.00 | Window Closed / Lapsed |