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:
Oct. 04, 2005
Filed:
Oct. 07, 2003
Hisao Kato, Kanagawa, JP;
Yoshiaki Nishimura, Shizuoka, JP;
Jun Murata, Saitama, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
The present invention relates to a charging member for charging a surface of a member to be charged in an image forming apparatus, and one aspect of the present invention provides a charging member having an outermost surface layer containing a conductive elastic material. The conductive elastic material comprises a polymer including a polar polymer, primarily including (i) acrylonitrile butadiene rubber, (ii) an ethylene oxide-propylene oxide-allyl glycidyl ether terpolymer, and (iii) a homopolymer of epichlorohydrin. The weights x, y and z of the components (i), (ii) and (iii), respectively, have a relationship of 0.2<y/(x+y+z)≦0.5 and 4<y/z≦20. This charging member can realize uniform charging and is small in resistance variation, even when used for a long time.