Electrical biasing scheme for preventing overplating in an image

Details Electrical biasing scheme for preventing overplating in an image Electrical biasing scheme for preventing overplating in an image

1997-03-31

1998-12-08

Grimley, Arthur T.

Electrophotography

Image formation

Development

399234, 399235, G03G 1501

Patent

active

058483373

ABSTRACT:
A method and apparatus for eliminating undesirable development of background charge potentials in a multicolor electrostatographic system is disclosed, wherein the application of a developer bias at a given development station is selectively controlled to be substantially equal to or greater than the background image voltage of the image generated by a preceding imaging station such that the voltage differential between toner particles at the development station and the background areas including the previous image areas is substantially zero and the electrostatic forces acting on the toner particles are insufficient to attract the toner particles to the residual image. A method and apparatus is disclosed for eliminating redevelopment of previous images in a multicolor electrostatographic system, and, more particularly, an image-on-image multicolor system, wherein the imaging and development biases for each color in the printing process is systematically adjusted so as to eliminate charge potential differentials which can operate to attract toner particles to the receiving member in a subsequent image development procedure.

REFERENCES:
patent: 4403848 (1983-09-01), Snelling
patent: 4569584 (1986-02-01), St. John et al.
patent: 4660059 (1987-04-01), O'Brien
patent: 5061969 (1991-10-01), Parker et al.
patent: 5069995 (1991-12-01), Swidler
patent: 5515155 (1996-05-01), Folkins
patent: 5570173 (1996-10-01), Nye et al.

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