Charging apparatus
AssigneeXerox Corporation
InventorThomas F. Hayne
Life of this patent
Estimating the term…
Abstract
An apparatus adapted to charge an image bearing member to a substantially uniform potential. The apparatus controls the area of the surface charged on the image bearing member so that it corresponds substantially in size to that of a sheet of support material arranged to have a copy of an original document reproduced thereon.
Claims19
An apparatus for forming a charged area on an image bearing member corresponding substantially in size to the surface area of a sheet of support material arranged to have a copy of an original document reproduced thereon, including:
- means for detecting the size of the surface area of the sheet of support material;
- means for charging the image bearing member to a substantially uniform level;
- and
- means, responsive to said detecting means, for controlling said charging means so that the charged surface area of the image bearing member corresponds substantially in size to the surface area of the sheet of support material.
An electrophotographic printing machine of the type employing a photoconductive member to reproduce a copy of an original document on a sheet of support material, wherein the improvement includes:
- means for detecting the size of the surface area of the sheet of support material;
- means for charging the photoconductive member to a substantially uniform level;
- and
- means, responsive to said detecting means, for controlling said charging means so that the charged surface of the photoconductive member corresponds substantially in size to the surface area of the sheet of support material.
A method of copying an original document on a sheet of support material, including the steps of:
- charging a photoconductive member to a substantially uniform potential;
- controlling said step of charging so that the surface area charged on the photoconductive member corresponds substantially in size to the surface area of the sheet of support material;
- and
- exposing the charged surface area of the photoconductive member to a light image of the original document recording an electrostatic latent image of the original document thereon.
Dependencies are inferred from the claim text.