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Corona Charging Device

IP.com Disclosure Number: IPCOM000092176D
Original Publication Date: 1968-Oct-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Schaffert, RM: AUTHOR

Abstract

Rapid, uniform electrostatic charging of the surface of an insulating member, such as the surface of a photoconductive insulating layer, is achieved. Such is effected without causing breakdown of the insulating member. The surface is electrostatically charged with a corona unit comprising a plurality of electrodes, such as wires perpendicular to the relative motion of the surface of the insulating member. The first electrode which deposits an electrostatic charge on the insulating surface is constructed, either geometrically or electrically or both, such that it provides a high-current density and high maximum plate voltage relative to the remaining electrodes. In drawing 1, corona unit 1 comprises a high-voltage source 2 and a plurality of electrodes 3, 4, and 5 under which the surface of insulating member 6 passes.

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Corona Charging Device

Rapid, uniform electrostatic charging of the surface of an insulating member, such as the surface of a photoconductive insulating layer, is achieved. Such is effected without causing breakdown of the insulating member. The surface is electrostatically charged with a corona unit comprising a plurality of electrodes, such as wires perpendicular to the relative motion of the surface of the insulating member. The first electrode which deposits an electrostatic charge on the insulating surface is constructed, either geometrically or electrically or both, such that it provides a high-current density and high maximum plate voltage relative to the remaining electrodes. In drawing 1, corona unit 1 comprises a high-voltage source 2 and a plurality of electrodes 3, 4, and 5 under which the surface of insulating member 6 passes. The current density and plate voltage of electrodes 4 and 5 are lower than the electrode 3 because unit 1 is electrically configured with resistors 7 between the electrode 3 and 4 and electrodes 4 and 5. This same result can be achieved geometrically with the corona unit shown in drawing
2. This comprises high-voltage source 9 and a plurality of electrodes 10, 11, and 12 under which the surface of insulating member 13 passes. Electrodes 11 and 12 are spaced further from the surface of member 13 than electrode 10. The latter, due to its close proximity relative to the proximity of the other electrodes, carries a higher plate vol...