Photoelectrophoretic pigment discharging with A.C. corotron or U.V. illumination
US3985434A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 24, 1975 |
| Grant date | Oct 12, 1976 |
| Priority date | — |
| Expiry date | Apr 24, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G17/04
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A photoelectrophoretic imaging machine for producing, in a preferred embodiment, full color copies from opaque originals, or alternatively, copies from transparencies. In a preferred embodiment, the formation of photoelectrophoretic images occurs between two thin injecting and blocking webs at least one of which is partially transparent and the image formed is transferred to a paper web. The injecting and blocking webs may be disposable, thus, cleaning systems are not required. The injecting web is provided with a conductive surface and is driven in a path to the inking station where a layer of photoelectrophoretic ink is applied to the conductive web surface. The inked injecting web is driven in a path passing in close proximity to a deposition scorotron at the precharge station and into contact with the blocking web to form the ink-web sandwich at the imaging roller in the imaging zone. The conductive surface of the injecting web is grounded and a high voltage is applied to the imaging roller subjecting the sandwich to a high electric field at the same time as the scanning optical image is focussed on the nip or interface between the injecting and blocking webs, and development t…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.