Development unit having an asymmetrically biased electrode wires
AssigneeXerox Corporation
InventorJeffrey J. Folkins
Life of this patent
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Abstract
The present invention is an apparatus that develops a latent image recorded on a surface with toner. An electrically biased electrode member in the development zone between the photoconductive member and the donor roll detaches toners from the donor roll so as to form a toner powder cloud in the development zone. The electrical bias applied on the electrode member is an asymmetrical wave. Toner from the toner powder cloud develops the latent image.
Claims4
An electrophotographic printing machine of the type in which an electrostatic latent image recorded on a charge retentive surface is developed with toner to form a visible image thereof, wherein the improvement includes:
- a donor roll arranged to transport toner to a development zone adjacent the surface;
- a plurality of electrode wires disposed in the development zone;
- and
- means for electrically biasing said electrode wires relative to said donor roll with a DC electric potential and an asymmetrical AC electrical wave form to detach toner from said donor roll and produce a toner cloud in the development zone.
Dependencies are inferred from the claim text.