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NEEDLES FOR POSITIVE OR AC CORONA

IP.com Disclosure Number: IPCOM000024248D
Original Publication Date: 1980-Feb-29
Included in the Prior Art Database: 2004-Apr-02
Document File: 2 page(s) / 39K

Publishing Venue

Xerox Disclosure Journal

Abstract

Needle corona generating devices offer some potential advantages in xerographic applications. It has been observed, however, that it is difficult to obtain large positive or AC corona currents without sparking. It has been found that tip shape and size are important parameters in generating positive and AC corona. Needles with tapered shafts leading to rounded tips are most desirable. Tip diameters below O.lmm readily yield to sparking. Larger tips require higher voltage and do not offer any known advantages. Thus, for positive and low frequency AC corona the optimum tip diameter is in the range of 0.1 to 0.15mm.

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(EROX DISCLOSURE JOURNAL

NEEDLES FOR POSITIVE OR AC CORONA Proposed Charles F. Gallo Classification

U.S. Cl. 250/324 Int. C1. HOlt 19/04

Needle corona generating devices offer some potential advantages in xerographic applications. It has been observed, however, that it is difficult to obtain large positive or AC corona currents without sparking. It has been found that tip shape and size are important parameters in generating positive and AC corona. Needles with tapered shafts leading to rounded tips are most desirable. Tip diameters below O.lmm readily yield to sparking. Larger tips require higher voltage and do not offer any known advantages. Thus, for positive and low frequency AC corona the optimum tip diameter is in the range of 0.1 to 0.15mm.

Volume 5 Number 1 January/February 1980 39

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XEROX 40 DISCLOSURE JOURNAL

Volume 5 Number 1 January/February 1980

[This page contains 1 picture or other non-text object]