Electrophotographic imaging with toners of opposite sign electrical charge
US5450189A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 15, 1994 |
| Grant date | Sep 12, 1995 |
| Priority date | — |
| Expiry date | Feb 15, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/0126
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A system and method for electrophotographic printing an image with a plurality of toners, where the plurality of toners includes toners that are attracted to either a first charge potential or a second charge potential. The electrophotographic system includes a photoconductive surface that is charged to the second charge potential. A laser selectively discharges the photoconductive surface to the first charge potential in accordance the image to be printed. Those toners that are attracted to the first charge potential are applied to the photoconductive surface, wherein the toners are electrostatically attracted to those areas of the photoconductive surface that are at the first charge potential. The photoconductive surface again charged to the second charge potential. The photoconductive surface is again discharged to the first charge potential in accordance with those areas of the image to which those toners that are attracted to the second charge potential are to be repelled. Those toners that are attracted to the second charge potential are applied to the photoconductive surface, wherein the toners are electrostatically attracted to those areas of the photoconductive surface tha…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.