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Electrostatic Copying Process

IP.com Disclosure Number: IPCOM000093581D
Original Publication Date: 1967-Nov-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Medley, HC: AUTHOR [+2]

Abstract

In the electrostatographic process in which the electrostatic pattern is developed on the member on which the pattern is formed and transferred to paper, the main disadvantage is that the member must be cleaned of any residual developer. Such cleaning after each pattern is transferred.

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Electrostatic Copying Process

In the electrostatographic process in which the electrostatic pattern is developed on the member on which the pattern is formed and transferred to paper, the main disadvantage is that the member must be cleaned of any residual developer. Such cleaning after each pattern is transferred.

This disadvantage can be overcome by employing the electrostatographic process shown. Drum 1 carries photoconductive insulating member 2 on its periphery. Adjacent member 2 and positioned around drum 1 are applicator station 3, charging station 4, and exposure station 5. Thin layer 6 of dielectric liquid is applied to the surface of member 2 at station 3 by roller 7 rotatively mounted in reservoir 8.

On layer 6, an electrostatic charge is uniformly deposited at station 4 by corona discharge device 9 followed by selective dissipation of the charge corresponding to a light pattern at station 5. The light pattern on drum 1 is created by scanning a document to be copied with lamps 10 to produce a reflected light pattern from the document. The pattern is deflected by mirror 11 through lens 12 onto drum 1. The electrostatic pattern thus formed causes a deformation pattern in layer 6.

As a final station around the periphery of drum 1, offset station 13 has surface characteristics such that layer 6 is normally repelled, except for those areas carrying electrostatic charges. For example, if layer 6 is an oil, the surface characteristic of drum 1 is oleophobic....