Method of producing latent images on an electrostatic plate
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United States of America Patent
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Apr 5, 2005
Grant Date -
Nov 13, 2003
app pub date -
Jun 3, 2003
filing date -
Oct 13, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method for producing a latent image of differentially charged regions on an electrostatic printing plate that may subsequently be realized using toner particles. The printing plate's electrically conducting substrate is coated with a layer of photo-polymer material that has a low electrical conductivity in a normal state. Selected regions of the photo-polymer are then exposed to radiation of a wavelength that produces cross-linking of the photo-polymer. The surface of the photo-polymer is then charged using a corona-discharge while the conducting substrate is grounded. The applied charge is discharged in the unexposed, normal regions of the photo-resist, and retained in the cross-linked regions that were exposed to the radiation because the cross-linking increases the electrical resistance of the photo-polymer. The result is a latent image of differential charge.
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