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Corona Generator Housing for Reducing Streaks on Copies Produced by Electrophotographic Apparatus

IP.com Disclosure Number: IPCOM000041527D
Original Publication Date: 1984-Feb-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 2 page(s) / 86K

Publishing Venue

IBM

Related People

Reider, RJ: AUTHOR

Abstract

This article relates to copy quality produced by an electrophotographic machine and describes a technique for reducing or completely eliminating streaks on copies where such streaks are caused by "nodes" on the corona generating wire. Nodes are generally the result of contaminating particles (dust, etc.) on the corona wire, and negative charge coronas are particularly sensitive to node-created streaks. The technique involves the placing of a dielectric screen on the top underside of the corona housing. Fig. 1 shows a metal corona housing 10 with solid dielectric material 11 placed along each interior side thereof. Slots 12 are placed in the top of the housing 10 to afford better air circulation through the housing. Reduction of effective corona current tends to accentuate nodal corona streaks.

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Corona Generator Housing for Reducing Streaks on Copies Produced by Electrophotographic Apparatus

This article relates to copy quality produced by an electrophotographic machine and describes a technique for reducing or completely eliminating streaks on copies where such streaks are caused by "nodes" on the corona generating wire. Nodes are generally the result of contaminating particles (dust, etc.) on the corona wire, and negative charge coronas are particularly sensitive to node- created streaks. The technique involves the placing of a dielectric screen on the top underside of the corona housing. Fig. 1 shows a metal corona housing 10 with solid dielectric material 11 placed along each interior side thereof. Slots 12 are placed in the top of the housing 10 to afford better air circulation through the housing. Reduction of effective corona current tends to accentuate nodal corona streaks. These streaks are reduced or eliminated without changing corona current by placing a dielectric screen wire 13 along the underside of the top of corona housing 10. An alternative corona housing 14 is shown in Fig. 2 with a large multiplicity of holes 15 replacing slots 12. Again, the dielectric screen wire 13 is placed on the underside of the top of the housing.

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