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:
Nov. 16, 2010
Filed:
Feb. 12, 2010
Takumi Furukawa, Susono, JP;
Tomohito Taniguchi, Suntou-gun, JP;
Hidekazu Matsuda, Susono, JP;
Yusuke Yagisawa, Mishima, JP;
Takumi Furukawa, Susono, JP;
Tomohito Taniguchi, Suntou-gun, JP;
Hidekazu Matsuda, Susono, JP;
Yusuke Yagisawa, Mishima, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
The present invention provides a charging roller having a stable chargeability and capable of preventing occurrence of 'fogging' on an electrophotographic image. The invention relates to a contact-charging type charging roller which includes a conductive support and a surface layer. The surface layer contains a binder, resin particles containing a carbon black dispersed in the binder, and graphitized particles dispersed in the binder; and the surface layer has, on its surface, convex portions derived from the resin particles, and convex portions derived from the graphitized particles. These convex portions have a specific relationship.