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:
Aug. 31, 1993
Filed:
Nov. 04, 1992
Yukio Nishio, Kurume, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A conductive foam rubber roller is used as a charging roller, developing roller, toner-removing roller, or transfer roller in an image formation apparatus such as an electrophotographic recording apparatus, and comprises a tubular roller element made of a conductive foam rubber material and having a central bore defined by a solid skin layer having an electric resistivity considerably higher than that of a foam structure of the rubber element, and a conductive shaft on which the roller element is mounted and fixed. End sections of the skin layer are removed from the roller element such that the foam structure thereof is in direct contact with the shaft at end sections of the bore thereof. Alternatively, a conductive disc-like member having a central opening formed therein is inserted onto the shaft to be abutted against an end face of the roller element, whereby sufficient electric contact can be established between the roller element and the shaft.