EP0180378A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Contact brush charging
Assignee: Xerox Corp
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Filing: 1985-10-16
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Granted: —
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Expires: 2005-10-16
Abstract
Abstract @o A contact brush charging device (11) for charging an insulating layer, especially the photoreceptor (13) in a xerographic repdocution apparatus, comprises a plurality of resiliently, flexible thin fibers (31) which have an electrical resistivity in the range from 10 2 to 10 6 ohms-cm and which are substantially resistivity stable to changes in relative humidity and temperature over the normal operating range and ageing. In a preferred embodiment the fibers are arranged in a uniform distribution along the length of the brush and comprise partially carbonized polyacrylonitrile fibers which have an electrical resistivity in the range from 10 3 to 10 5 ohms-cm and which are substantially homogeneous in composition.
Inventors
- 👤 Joan R. Ewing
- 👤 Joseph A. Swift
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 14:41
CPC Classifications
G; G03; G03G; G03G21/00; G03G21/06; G03G15/00; G03G15/02; G03G15/0208; G03G15/0216; G03G15/0233; G03G15/0291
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
88 words
A contact brush charging device for charging an insulating layer comprising a plurality of thin fibers arranged in a brush like configuration, said fibers being supported by a support means so that the distal ends of the fibers may contact the insulating layer and having an electrical resistivity in the range from about 10 2 ohms-cm to about 10 6 ohms-cm characterized in that said fibers are resiliently flexible and are substantially resistivity stable to changes in relative humidity and temperature over the normal operating range and ageing.
Claim 2
Dependent Claim
88 words
A contact brush charging device for charging an insulating layer comprising a plurality of thin fibers arranged in a brush like configuration, said fibers being supported by a support means so that the distal ends of the fibers may contact the insulating layer and having an electrical resistivity in the range from about 10 2 ohms-cm to about 10 6 ohms-cm characterized in that said fibers are resiliently flexible and are substantially resistivity stable to changes in relative humidity and temperature over the normal operating range and ageing.
Claim 3
Dependent Claim
25 words
The device of Claim 1, wherein said fibers have an electrical resistivity in the range from about 10 3 ohms-em to about 10 5 ohms-cm.
Claim 4
Dependent Claim
25 words
The device of claim 1 or claim 2, wherein said plurality of fibers are arranged in a uniform distribution along the length of the brush.
Claim 5
Independent Claim
14 words
The device of any preceding claim, wherein said fibers are substantially homogenous in composition.
Claim 6
Independent Claim
14 words
The device of any preceding claim, wherein said fibers are partially carbonized polyacrylonitrile fibers.
Claim 7
Independent Claim
40 words
The device of any preceding claim, wherein said fibers are generally circular in cross section and have a diameter in the range from about 5 microns to about 50 microns, and preferably from about 8 microns to about 10 microns.
Claim 8
Independent Claim
36 words
The device of any preceding claim, wherein said fibers are arranged in said brush to have a fiber fill density of from about 5 x 10 4 to 4 x 10 6 fibers per square inch.
Claim 9
Independent Claim
21 words
The device of any preceding claim, wherein said fibers are arranged in a rotary brush configuration around a cylindrical conductive sleeve.
Claim 10
Independent Claim
31 words
A method of charging an insulating layer comprising contacting the surface with the contact brush charging device claimed in any preceding claim, and applying to said charging device an electrical potential.
Claim 11
Dependent Claim
36 words
The method of claim 9, wherein the insulating layer is contacted by at least two contact brush charging devices claimed in any of claims 1 to 8, said charging devices being arranged in mutually parallel relationship.
References Cited (Backward Citations)
No citation records indexed.
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