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:
Dec. 14, 1993
Filed:
May. 31, 1991
Kazuhiko Kikuchi, Kanagawa, JP;
Naruhito Yoshida, Kanagawa, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A device for developing a latent image on an image carrier is used in an image forming apparatus. The developing device includes a developing roller, located to contact with the image carrier, for supplying a developing agent to the image carrier, and a blade, located to face the developing roller, for forming a developing agent layer of the developing agent supplied to the image carrier on the developing roller. The developing roller comprises an urethane rubber layer and a conductive urethane resin layer located around the rubber layer, in which the thickness T [.mu.m] of the conductive resin layer satisfies the formula, 3.times.Rz=T=1OO when the maximum surface roughness of the rubber layer is taken in Rz [.mu.m]. in addition, the respective elongations (%) of the rubber and resin layers L.sub.e and L.sub.1, satisfy the formula L.sub.e -L.sub.1 .ltoreq.200.