Charging apparatus
AssigneeXerox Corporation
InventorNero R. Lindblad
Life of this patent
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Abstract
Apparatus for forming images on a charge-retentive surface including uncharged toner particles which are applied to electrostatic latent images formed on the surface. The latent image is formed on the charge-retentive surface by exposing a charged surface to a light pattern of an image to be reproduced. Prior to image exposure, the charge pattern comprises a periodic line screen pattern which is formed by means of a conductive charging brush having a suitable bias voltage applied thereto at a frequency suitable for forming the line screen pattern. By using such an arrangement charging and screening of the charge-retentive surface occur simultaneously.
Claims4
The method of forming toner images on a charge-retentive surface moving in a first direction, said method including the steps of:
- contacting said charge-retentive surface with an electrically conductive brush;
- electrically biasing said brush to a voltage at a frequency suitable for forming a line screen pattern on said charge-retentive surface capable of attracting non-charged toner;
- simultaneously vibrating said brush in a second direction substantially perpendicular to said first direction;
- exposing said pattern to a light image to thereby selectively discharge said pattern;
- and
- presenting uncharged toner to the discharged pattern.
Apparatus for forming images on a charge retentive surface, said apparatus comprising:
- means for moving said charge-retentive surface in a first direction;
- an electrically conductive brush supported for contact with said charge-retentive surface;
- means for electrically biasing said conductive brush to a voltage which is applied at a frequency suitable for forming a periodic line pattern on said charge-retentive surface;
- means for vibrating said brush in a second direction which is substantially perpendicular to said first direction;
- means for exposing said line pattern to an image to be reproduced to thereby form a latent electrostatic image on said surface and
- means for applying uncharged toner to said surface.
Dependencies are inferred from the claim text.