Film ghost removal in electrographic plotters by voltage bias of

Details Film ghost removal in electrographic plotters by voltage bias of Film ghost removal in electrographic plotters by voltage bias of

1989-12-20

1991-10-08

Fuller, Benjamin R.

Recorders

Electric recording

Electrochemical

3461531, G01D 1506

Patent

active

050558625

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.

REFERENCES:
patent: 4290076 (1981-09-01), McFarland
patent: 4366491 (1982-12-01), Ohnishi et al.
patent: 4994861 (1991-02-01), Brandon et al.
patent: 5003327 (1991-03-01), Theodoulou et al.

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