Patent US4547060A successfully refreshed from Google Patents.
US4547060A
Expired / Lapsed
US
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Charging apparatus
Assignee: Xerox Corp
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Filing: 1983-12-01
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Granted: 1985-10-15
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Expires: 2003-12-01
Abstract
Abstract Apparatus for forming images on a charge-retentive surface including uncharged toner particles which are applied to electrostatic latent images formed on the surface. The latent image is formed on the charge-retentive surface by exposing a charged surface to a light pattern of an image to be reproduced. Prior to image exposure, the charge pattern comprises a periodic line screen pattern which is formed by means of a conductive charging brush having a suitable bias voltage applied thereto at a frequency suitable for forming the line screen pattern. By using such an arrangement charging and screening of the charge-retentive surface occur simultaneously.
Inventors
- 👤 Nero R. Lindblad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:26
CPC Classifications
G; G03; G03G; G03G13/00; G03G13/22; G03G15/00; G03G15/02; G03G15/0208; G03G15/0216; G03G2215/00; G03G2215/02; G03G2215/021; G03G2215/023; Y; Y10; Y10S; Y10S430/00; Y10S430/001; Y10S430/102
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
91 words
The method of forming toner images on a charge-retentive surface moving in a first direction, said method including the steps of: contacting said charge-retentive surface with an electrically conductive brush; electrically biasing said brush to a voltage at a frequency suitable for forming a line screen pattern on said charge-retentive surface capable of attracting non-charged toner; simultaneously vibrating said brush in a second direction substantially perpendicular to said first direction; exposing said pattern to a light image to thereby selectively discharge said pattern; and presenting uncharged toner to the discharged pattern.
Claim 2
Independent Claim
91 words
The method of forming toner images on a charge-retentive surface moving in a first direction, said method including the steps of: contacting said charge-retentive surface with an electrically conductive brush; electrically biasing said brush to a voltage at a frequency suitable for forming a line screen pattern on said charge-retentive surface capable of attracting non-charged toner; simultaneously vibrating said brush in a second direction substantially perpendicular to said first direction; exposing said pattern to a light image to thereby selectively discharge said pattern; and presenting uncharged toner to the discharged pattern.
Claim 3
Dependent Claim
108 words
Apparatus for forming images on a charge retentive surface, said apparatus comprising: means for moving said charge-retentive surface in a first direction; an electrically conductive brush supported for contact with said charge-retentive surface; means for electrically biasing said conductive brush to a voltage which is applied at a frequency suitable for forming a periodic line pattern on said charge-retentive surface; means for vibrating said brush in a second direction which is substantially perpendicular to said first direction; means for exposing said line pattern to an image to be reproduced to thereby form a latent electrostatic image on said surface and means for applying uncharged toner to said surface.
Claim 4
Dependent Claim
108 words
Apparatus for forming images on a charge retentive surface, said apparatus comprising: means for moving said charge-retentive surface in a first direction; an electrically conductive brush supported for contact with said charge-retentive surface; means for electrically biasing said conductive brush to a voltage which is applied at a frequency suitable for forming a periodic line pattern on said charge-retentive surface; means for vibrating said brush in a second direction which is substantially perpendicular to said first direction; means for exposing said line pattern to an image to be reproduced to thereby form a latent electrostatic image on said surface and means for applying uncharged toner to said surface.
Claim 5
Dependent Claim
33 words
Apparatus according to claim 2 wherein an a.c. voltage of approximately -1200 volts with a bias of -900 volts d.c. at a frequency of approximately 400 Hz is applied to said conductive brush.
Claim 6
Dependent Claim
12 words
Apparatus according to claim 3 wherein said charge-retentive surface comprises a photoconductor.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-10-14 | 1989-04-15 | 1989-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-14 | 1993-04-15 | 1993-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-14 | 1997-04-15 | 1997-10-15 | $7700.00 | Window Closed / Lapsed |