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Proceedings Paper

Charge Transfer To Electrographic Film
Author(s): John R. Wyhof
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Paper Abstract

A process and materials have been developed for the transfer of electrostatic charge from a photoconductor to clear film. Such a process has applications in high resolution imaging systems. In operation a photoconductive layer coated on a metallic plate is charged by corona and imaged with visual radiation to form a latent image. The photoconductor is then placed in contact with the electrographic film consisting of an active insulating layer on a conductive layer all on a clear film base. While in virtual contact the image charge transfers from the photoconductor to the insulation layer of the film with no external grounding or applied voltage while maintaining 100 1p/mm resolution. A model based on a simple electrical circuit has been developed. The model predicts the division of charge during contact of the photoconductor and film with air gap breakdown on approach. Although many complex charge transfer and air gap breakdown mechanisms may be also be occurring near and during contact, the predominant one can be explained using this model. The experimental apparatus and measurement technique is described. The charge transferred was found to be directly related to the dielectric characteristics of the photoconductor and insulating layer of the electrographic film. The measured surface charge after transfer supports the model developed. The toned image density can also be related to the surface charge on the electrographic film. By variation of these parameters the optimum photoconductor and film configuration can be determined.

Paper Details

Date Published: 12 February 1980
PDF: 7 pages
Proc. SPIE 0200, Laser Recording and Information Handling, (12 February 1980); doi: 10.1117/12.958063
Show Author Affiliations
John R. Wyhof, Advanced Reprographic Materials R & D, GAF Corporation (United States)


Published in SPIE Proceedings Vol. 0200:
Laser Recording and Information Handling
Albert A. Jamberdino, Editor(s)

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