Reversal development of latent electrostatic images on xeroprinting masters
US5051329A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 19, 1989 |
| Grant date | Sep 24, 1991 |
| Priority date | — |
| Expiry date | Dec 19, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G5/026
- WIPO fieldOptics
- WIPO sectorInstruments
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 PA0 (a) generating imagewise areas in the layer having different rates of charge decay and/or charge acceptance, PA0 (b) charging the layer, PA0 (c) allowing formation of an electrostatic image corresponding to the imagewise generated areas by differential charge decay and/or charge acceptance, PA0 (d) creating an electrical field to attract toner particles preferentially to the areas of lesser charge, and PA0 (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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.