Reversal development of latent electrostatic images on xeroprinting masters
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United States of America Patent
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Sep 24, 1991
Grant Date -
N/A
app pub date -
Dec 19, 1989
filing date -
Dec 19, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Process for reversal development of a latent electrostatic image in a layer on a conductive support by developing with an electrostatic developer having electrostatically charged toner particles by (a) generating imagewise areas in the layer having different rates of charge decay and/or charge acceptance, (b) charging the layer, (c) allowing formation of an electrostatic image corresponding to the imagewise generated areas by differential charge decay and/or charge acceptance, (d) creating an electrical field to attract toner particles preferentially to the areas of lesser charge, and (e) developing the areas of lesser charge with electrostatically charged toner particles having the same polarity as that of the charged layer. The developed image can be transferred to a receptor surface, e.g., paper. The process is useful with many type photosensitive masters in preparing reversal images with the use of only one master, toner and film original.
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