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Simultaneously Charging and Wetting a Photoconductive Surface

IP.com Disclosure Number: IPCOM000082208D
Original Publication Date: 1974-Oct-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Fowler, KJ: AUTHOR

Abstract

In an electrophotographic printing process, whereby the image development process consists of applying a liquid ink to an electrostatically deformed dielectric liquid layer, wetting the charge retaining surface with a dielectric liquid is typically accomplished by a resilient insulating roller. This is typically followed by electrostatically charging the photoconductor by a screened corona charging device.

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Simultaneously Charging and Wetting a Photoconductive Surface

In an electrophotographic printing process, whereby the image development process consists of applying a liquid ink to an electrostatically deformed dielectric liquid layer, wetting the charge retaining surface with a dielectric liquid is typically accomplished by a resilient insulating roller. This is typically followed by electrostatically charging the photoconductor by a screened corona charging device.

A screened corona device adds considerably to the cost of the required hardware necessary to the process. It also requires an expensive power supply. A corona device requires special hardware to prevent contamination of the wires by dielectric vapors and airborne particles which reduces corona efficiency, necessitating frequent servicing. Corona wire life is relatively short and requires replacement. The use of a corona charge device necessitates the use of an ozone filter to operate safely.

The wetting roller which typically applies the dielectric liquid to the photoconductor for the liquid ink development process is typically an insulating material, such as rubber or urethane. The function of the wetting station is to apply a metered, uniform film of dielectric liquid to the photoconductor. By replacing this insulating roller with an electrically conductive roller, the wetting station becomes a charging/ wetting station. A single roller thereby performs two functions simultaneously: 1) Applies the...