Film ghost removal in electrographic plotters by voltage bias of the plotter fountain or film edge-strip
US5055862A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 20, 1989 |
| Grant date | Oct 8, 1991 |
| Priority date | — |
| Expiry date | Dec 20, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65H2301/5133
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A preferred embodiment of the present invention is directed to a removal of a ghost image created during a processing of a film laminate medium by an electrographic plotter. A recording of an image on the film medium induces a ghosting potential over a developing station. The ghosting potential causes a spurious image to be developed by the developing station. The recorded image is created by depositing a charge on a dielectric layer of the film. A relationship exists between the deposited charge and the ghosting potential. By use of information known to the system, the ghosting potential may be estimated and reduced. A preferred method estimates the magnitude of the ghosting potential by use of the relationship between deposited charge and ghosting potential. A counteracting potential is applied to the system to reduce the ghosting potential over the developing station. The reduction of the ghosting potential substantially removes the ghost image created during the processing of the film laminate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.