The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 01, 1984
Filed:
Jul. 28, 1982
Takao Aoki, Abiko, JP;
Takahiro Inoue, Yokohama, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An electrophotographic device wherein an image is formed by exposing a movable photosensitive member to an optical image, wherein such member includes a conductive layer, a photoconductive layer, and an insulating layer. A primary corona discharger of predetermined polarity charges the surface of such member and an imagewise exposure is effected through an optically open port in the rear side of a secondary corona discharger. A plural number of sets of control grids, adapted to be set at different electric potentials, are used in conjunction with the secondary charger which applies a corona discharge having an opposite polarity component to the primary corona. The control potential at the upstream grid has a value biased more toward the high light potential side of the latent image than toward the control potential of the adjacent grid.