EP0147985A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Corona device
Assignee: Xerox Corp
•
Filing: 1984-12-14
•
Granted: —
•
Expires: 2004-12-14
Abstract
Abstract A miniaturized scorotron corona generator (80) for uniformly charging a receiver surface (22) includes a coronode (85) partially surrounded by a conductive shield (81) with a control screen (82) attached to the shield. The control screen is closely spaced to the receiver surface such that fringing fields between the screen and receiver surface contribute significantly both to efficient ion pumping and to potential leveling.
Inventors
- 👤 Robert William Gundlach
- 👤 Richard Frank Bergen
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 20:15
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/02; G03G15/0291; H; H01; H01T; H01T19/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
75 words
A compact corona uniform charging system (80) comprising: a corona emitting low radius electrode (85); means for applying a potential to said electrode; an insulating shield (81) partially surrounding said electrode (85); screen means (82) positioned adjacent said electrode to form a scorotron, said scorotron being positioned about 1.5mm away from a surface (22) to be charged thereby reducing high voltage requirements and ozone emissions, and impedance means adapted into the system to prevent arcing.
Claim 2
Dependent Claim
75 words
A compact corona uniform charging system (80) comprising: a corona emitting low radius electrode (85); means for applying a potential to said electrode; an insulating shield (81) partially surrounding said electrode (85); screen means (82) positioned adjacent said electrode to form a scorotron, said scorotron being positioned about 1.5mm away from a surface (22) to be charged thereby reducing high voltage requirements and ozone emissions, and impedance means adapted into the system to prevent arcing.
Claim 3
Dependent Claim
15 words
The charging system of Claim 1, wherein said low radius electrode is a pin electrode.
Claim 4
Dependent Claim
16 words
The charging system of Claim 1, wherein said low radius electrode is at least one wire.
Claim 5
Dependent Claim
23 words
The charging system of any of the preceding claims, wherein said screen is between 30 to 80% open and preferably about 65% open.
Claim 6
Dependent Claim
34 words
The charging system of. any of the preceding claims, wherein said screen has a thickness of between 3 - 25 mils (75 - 635pm) and preferably between 3 - 5 mils (75 - 127µm).
Claim 7
Dependent Claim
29 words
The charging system of any of the preceding claims, wherein said low radius electrode is separated from said screen by about 3 - 5mm and preferably 4 - 5mm.
Claim 8
Dependent Claim
16 words
The charging system of Claim 6, wherein said low radius electrode includes a series of wires.
Claim 9
Dependent Claim
21 words
The charging system of Claim 6, wherein said low radius electrode comprises a sawtooth member having teeth spaced on 3mm centers.
Claim 10
Dependent Claim
67 words
A compact negative corona uniform charging system, comprising: a negative corona emitting low radius electrode (85); means for applying a potential to said electrode; screen means (82) positioned adjacent said electrode to form a scorotron, said scorotron being positioned about 1.5mm away from a surface (22) to be charged thereby reducing high voltage requirements and ozone emissions, and impedance means adapted into the system to prevent arcing.
Claim 11
Dependent Claim
67 words
A compact negative corona uniform charging system, comprising: a negative corona emitting low radius electrode (85); means for applying a potential to said electrode; screen means (82) positioned adjacent said electrode to form a scorotron, said scorotron being positioned about 1.5mm away from a surface (22) to be charged thereby reducing high voltage requirements and ozone emissions, and impedance means adapted into the system to prevent arcing.
Claim 12
Dependent Claim
79 words
A compact positive charging system (80) adapted to provide a uniform charge to a photoconductive surface (22), comprising: a positive corona emitting wire (85) of 30 to 90 um diameter; means for applying a potential to said wire; and screen means (82) having a means for applying a control potential connected thereto, said screen means being positioned close enough to the photoconductive surface to produce ringing fields until the potential of the photoconductive surface reaches that of the screen.
Claim 13
Dependent Claim
79 words
A compact positive charging system (80) adapted to provide a uniform charge to a photoconductive surface (22), comprising: a positive corona emitting wire (85) of 30 to 90 um diameter; means for applying a potential to said wire; and screen means (82) having a means for applying a control potential connected thereto, said screen means being positioned close enough to the photoconductive surface to produce ringing fields until the potential of the photoconductive surface reaches that of the screen.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.