US3687538A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for exposing latent image margins in electrophotographic copying apparatus
Assignee: Xerox Corp
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Filing: 1971-08-23
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Granted: 1972-08-29
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Expires: 1991-08-23
Abstract
Abstract Apparatus for obtaining electrophotographic copies of improved quality and appearance in which a rectangular frame member is disposed adjacent the photoreceptor circumscribing an area on the photoreceptor onto which the images to be reproduced are projected. The frame member includes an internal channel opening downwardly onto the surface of the photoreceptor. Corona discharge means are supported in the channel along the leading side transversely to the direction of movement of the photoreceptor to uniformly charge the surface of the photoreceptor as it is advanced beneath the frame member. Illumination means also are supported internally of the frame member within the channel on all four sides for uniformly discharging the charged surface of the photoreceptor in the areas surrounding the imaged area underlying the frame member to eliminate development thereof.
Inventors
- 👤 Seiji Matsumoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:29
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/04; G03G15/045; G03G15/047; G03G2215/00; G03G2215/04; G03G2215/0429; G03G2215/0431; G03G2215/0448
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
178 words
In an electrophotographic reproducing apparatus in which a photoreceptor is advanced in a stepped intermittent manner, apparatus for charging and exposing said photoreceptor including, a light source for illuminating an image to be reproduced, means for projecting said illuminated image onto the surface of said photoreceptor, a frame member disposed adjacent said photoreceptor and circumscribing the area on said photoreceptor onto which said illuminated images are projected, said frame member including an internal channel opening downwardly onto the surface of said photoreceptor, corona discharge means supported transversely to the direction of movement of said photoreceptor internally of said frame member along one side thereof within said channel, means for energizing said corona discharge means when said photoreceptor is being advanced to uniformly charge the surface of said photoreceptor as it is advanced beneath said frame member, and illumination means supported internally of said frame member within said channel for uniformly discharging the charged surface of said photoreceptor in an area surrounding the imaged area underlying said frame member to eliminate the unwanted fringe fields surrounding the imaged area.
Claim 2
Dependent Claim
178 words
In an electrophotographic reproducing apparatus in which a photoreceptor is advanced in a stepped intermittent manner, apparatus for charging and exposing said photoreceptor including, a light source for illuminating an image to be reproduced, means for projecting said illuminated image onto the surface of said photoreceptor, a frame member disposed adjacent said photoreceptor and circumscribing the area on said photoreceptor onto which said illuminated images are projected, said frame member including an internal channel opening downwardly onto the surface of said photoreceptor, corona discharge means supported transversely to the direction of movement of said photoreceptor internally of said frame member along one side thereof within said channel, means for energizing said corona discharge means when said photoreceptor is being advanced to uniformly charge the surface of said photoreceptor as it is advanced beneath said frame member, and illumination means supported internally of said frame member within said channel for uniformly discharging the charged surface of said photoreceptor in an area surrounding the imaged area underlying said frame member to eliminate the unwanted fringe fields surrounding the imaged area.
Claim 3
Dependent Claim
19 words
Apparatus according to claim 1 wherein said illumination means is energized simultaneously with the energization of said light source.
Claim 4
Dependent Claim
22 words
Apparatus according to claim 1 further including means for de-energizing said corona discharge means upon interruption of the advancement of said photoreceptor.
Claim 5
Dependent Claim
42 words
Apparatus according to claim 1 further including means for connecting said corona discharge energizing means to said corona discharge means when said photoreceptor is being advanced and to said light source and said illumination means when advancement of said photoreceptor is interrupted.
Claim 6
Dependent Claim
214 words
In an electrophotographic reproducing apparatus in which a photoreceptor is advanced in a stepped intermittent manner, apparatus for charging and exposing said photoreceptor including, a light source adapted to illuminate an image to be reproduced, means for projecting illuminated images onto the surface of said photoreceptor, a frame member positioned adjacent said photoreceptor enclosing an area on said photoreceptor within which illuminated images are projected, said frame member having an internal channel opening downwardly onto the surface of said photoreceptor, corona discharge means supported transversely to the direction of movement of said photoreceptor internally of said frame member along one side thereof within said channel, means for energizing said corona discharge means when said photoreceptor is being advanced to uniformly charge the surface of said photoreceptor as it is advanced beneath said frame, illumination means supported internally of said frame member within said channel adapted when energized to uniformly discharge the charged surface of said photoreceptor in the area underlying said frame member, meanS for energizing said light source to project an image to be reproduced onto the photoreceptor in the area within said frame member, and means for energizing said illumination means to discharge the charged surface of said photoreceptor underlying said frame member to eliminate unwanted fringe fields surrounding the imaged area.
Claim 7
Dependent Claim
214 words
In an electrophotographic reproducing apparatus in which a photoreceptor is advanced in a stepped intermittent manner, apparatus for charging and exposing said photoreceptor including, a light source adapted to illuminate an image to be reproduced, means for projecting illuminated images onto the surface of said photoreceptor, a frame member positioned adjacent said photoreceptor enclosing an area on said photoreceptor within which illuminated images are projected, said frame member having an internal channel opening downwardly onto the surface of said photoreceptor, corona discharge means supported transversely to the direction of movement of said photoreceptor internally of said frame member along one side thereof within said channel, means for energizing said corona discharge means when said photoreceptor is being advanced to uniformly charge the surface of said photoreceptor as it is advanced beneath said frame, illumination means supported internally of said frame member within said channel adapted when energized to uniformly discharge the charged surface of said photoreceptor in the area underlying said frame member, meanS for energizing said light source to project an image to be reproduced onto the photoreceptor in the area within said frame member, and means for energizing said illumination means to discharge the charged surface of said photoreceptor underlying said frame member to eliminate unwanted fringe fields surrounding the imaged area.
Claim 8
Dependent Claim
19 words
Apparatus according to claim 5 wherein said illumination means is energized simultaneously with the energization of said light source.
Claim 9
Dependent Claim
22 words
Apparatus according to claim 5 further including means for de-energizing said corona discharge means upon interruption of the advancement of said photoreceptor.
Claim 10
Dependent Claim
42 words
Apparatus according to claim 5 further including means for connecting said corona discharge energizing means to said corona discharge means when said photoreceptor is being advanced and to said light source and said illumination means when advancement of said photoreceptor is interrupted.
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) | 1975-08-29 | 1976-02-28 | 1976-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-29 | 1980-02-28 | 1980-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-29 | 1984-02-28 | 1984-08-29 | $7700.00 | Window Closed / Lapsed |