US3746442A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrophotographic imaging apparatus
Assignee: Xerox Corp
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Filing: 1971-11-23
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Granted: 1973-07-17
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Expires: 1991-11-23
Abstract
Abstract Electrophotographic apparatus in which the scanning assembly for providing light reflections from a document to be reproduced onto an electrophotographic recording surface is provided with a light reflective shield which is automatically moved by inertia between the light source and the document holder during the return scan to ensure the reflection of sufficient light onto the recording surface during the return scan and thereby effectively discharge the recording surface.
Inventors
- 👤 J Davidson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:03
CPC Classifications
G; G03; G03G; G03G21/00; G03G21/06; G03G21/08; G03G2215/00; G03G2215/04; G03G2215/0429; G03G2215/0431; G03G2215/0448; G03G2215/0463
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
111 words
An apparatus for projecting a light image onto an electrophotographic recording member, comprising: a copy holder for supporting an original; a electrophotographic recording member for receivIng light reflections; a light source; a movable scanner means for scanning light from the light source across said copy holder in a forward scan direction to reflect light from an original supported on said copy holder onto said electrophotographic member to produce an electrostatic latent image thereon: a light reflective shield; and means for supporting said light reflective shield between the light source and the copy holder during return movement of said scanning means to reflect light from said light source onto said electrophotographic member.
Claim 2
Independent Claim
111 words
An apparatus for projecting a light image onto an electrophotographic recording member, comprising: a copy holder for supporting an original; a electrophotographic recording member for receivIng light reflections; a light source; a movable scanner means for scanning light from the light source across said copy holder in a forward scan direction to reflect light from an original supported on said copy holder onto said electrophotographic member to produce an electrostatic latent image thereon: a light reflective shield; and means for supporting said light reflective shield between the light source and the copy holder during return movement of said scanning means to reflect light from said light source onto said electrophotographic member.
Claim 3
Dependent Claim
109 words
The apparatus of claim 1 wherein said support means movably supports said light reflective shield on said movable scanning means in first and second shield positions, said support means supporting said light reflective shield on said movable scanning means in the first shield position to permit light to be reflected from an original on said copy holder onto the electrophotographic recording member during movement of said movable scanning means in a forward scan direction and said supporting means supporting said light reflective shield on said movable scanning means in said second shield position between the copy holder and the light source during return movement of said movable scanning means.
Claim 4
Independent Claim
238 words
An apparatus for projecting a light image onto an electrophotographic recording member, comprising: a movable electrophotographic recording member for receiving light reflections; a light source; a copy holder for supporting an original; a movable scanning means mounted for movement with respect to said copy holder in forward and return scan directions, said scanning means in said forward scan direction reflecting light from an original supported on said copy holder onto said electrophotographic recording member to produce an electrostatic latent image thereon; a light reflective shield; support means supporting said light reflective shield on said scanning means in both first and second shield positions and for movement between the first and second shield positions, said support means supporting said shield in the first shield position to permit light to be reflected from an original on said copy holder onto the recording member during movement of the scanning means in the forward scan direction, said shield moving to the second shield position at the end of movement of said scanning means in the forward scan direction, said support means supporting said shield in the second shield position between the copy holder and the light source during movement of the scanning means in the return scan direction to relfect light from said light source onto the electrophotographic recording member, said shield moving to the first shield position at the end of movement of said scanning means in the return scan direction.
Claim 5
Independent Claim
238 words
An apparatus for projecting a light image onto an electrophotographic recording member, comprising: a movable electrophotographic recording member for receiving light reflections; a light source; a copy holder for supporting an original; a movable scanning means mounted for movement with respect to said copy holder in forward and return scan directions, said scanning means in said forward scan direction reflecting light from an original supported on said copy holder onto said electrophotographic recording member to produce an electrostatic latent image thereon; a light reflective shield; support means supporting said light reflective shield on said scanning means in both first and second shield positions and for movement between the first and second shield positions, said support means supporting said shield in the first shield position to permit light to be reflected from an original on said copy holder onto the recording member during movement of the scanning means in the forward scan direction, said shield moving to the second shield position at the end of movement of said scanning means in the forward scan direction, said support means supporting said shield in the second shield position between the copy holder and the light source during movement of the scanning means in the return scan direction to relfect light from said light source onto the electrophotographic recording member, said shield moving to the first shield position at the end of movement of said scanning means in the return scan direction.
Claim 6
Dependent Claim
199 words
The apparatus of claim 3 wherein the support means comprises a plurality of support rollers journaled to said movable scanning means: said shield being supported on said support rollers in the first and second shield positions and during movement therebetween; and first and second stop members, said first stop member stopping movement of the shield on said rollers at the first shield position and said second stop member stopping movement of the shield on said rollers at the second shield position, said shield, by inertia, remaining at rest at the first shield position for movement with the movable scanning means during movement in forward scan direction, upon the movable scanning means ending travel in said forward scan direction, said shield, by inertia, moving on said support rollers until stopped by said second stop member at the second shield position, said shield, by inertia, remaining at rest at the second shield position for movement with the movable scanning means during movement in the return scan direction and upon the movable scanning means stopping travel in said return scan direction, said shield, by inertia, moving on said support rollers until stopped by Said first stop member at the first shield position.
Claim 7
Independent Claim
283 words
An apparatus for projecting a light image onto an electrophotographic recording member, comprising: a copy holder for supporting an original; a movable electrophotographic recording member; a light source; a movable scanning carriage for scanning light from the light source across said copy holder; means to move said carriage across said copy holder in a first direction from a first carriage position to a second carriage position and in a second direction opposite to the first direction from said second carriage position, to said first carriage position; a light reflective shield, and support means for said shield connected to said carriage, said support means supporting said shield in a first shield position for movement with said carriage from the first carriage position to the second carriage position, said shield in said first shield position permitting light to pass from the light source to said copy holder whereby said carriage scans light across an original on said copy holder to reflect light from an original onto said recording member and produce an electrostatic latent image, said support means supporting said shield for movement, by inertia, from the first shield position to a second shield position upon the carriage reaching the second carriage position, said shield in said second shield position being between the light source and the copy holder whereby light is refelected by the light shield onto the recording member, said support means supporting said shield in said second shield position during movement of the carriage from the second carriage position to the first carriage position, said support means supporting said shield for movement, by inertia, from the second shield position to the first shield position upon the carriage reaching the first carriage position.
Claim 8
Independent Claim
283 words
An apparatus for projecting a light image onto an electrophotographic recording member, comprising: a copy holder for supporting an original; a movable electrophotographic recording member; a light source; a movable scanning carriage for scanning light from the light source across said copy holder; means to move said carriage across said copy holder in a first direction from a first carriage position to a second carriage position and in a second direction opposite to the first direction from said second carriage position, to said first carriage position; a light reflective shield, and support means for said shield connected to said carriage, said support means supporting said shield in a first shield position for movement with said carriage from the first carriage position to the second carriage position, said shield in said first shield position permitting light to pass from the light source to said copy holder whereby said carriage scans light across an original on said copy holder to reflect light from an original onto said recording member and produce an electrostatic latent image, said support means supporting said shield for movement, by inertia, from the first shield position to a second shield position upon the carriage reaching the second carriage position, said shield in said second shield position being between the light source and the copy holder whereby light is refelected by the light shield onto the recording member, said support means supporting said shield in said second shield position during movement of the carriage from the second carriage position to the first carriage position, said support means supporting said shield for movement, by inertia, from the second shield position to the first shield position upon the carriage reaching the first carriage position.
Claim 9
Dependent Claim
13 words
The apparatus of claim 5 wherein the recording member is an annular member.
Claim 10
Dependent Claim
17 words
The apparatus of claim 6 wherein the light source is connected to the carriage for movement therewith.
Claim 11
Dependent Claim
217 words
The apparatus of claim 5 wherein the support means comprises a plurality of support rollers journaled to said movable carriage, said shield being supported on said support rollers in the first and second shield positions and during movement therebetween; and first and second stop members, said first stop member stopping movement of the shield on said rollers at the first shield position and said second stop member stopping movement of the shield on said rollers at the second shield position, said shield, by inertia, remaining at rest at the first shield position for movement with the movable carriage during movement of the movable carriage in the first direction, upon the movable carriage stopping travel in said first direction at the second carriage position, said shield, by inertia, moving on said support rollers in said first direction until stopped by said second stop member at the second shield position, said shield, by inertia, remaining at rest at the second shield position for movement with the movable carriage during movement of the movable carriage in the second direction and upon the movable carriage stopping travel in said second direction at the first carriage position, said shield, by inertia, moving on said support rollers in said second direction until stopped by said first stop member at the first shield position.
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) | 1976-07-16 | 1977-01-15 | 1977-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-16 | 1981-01-15 | 1981-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-16 | 1985-01-15 | 1985-07-17 | $7700.00 | Window Closed / Lapsed |