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:
Apr. 13, 1993
Filed:
Oct. 28, 1991
Toshio Miyamoto, Tokyo, JP;
Yasushi Sato, Kawasaki, JP;
Akihiko Takeuchi, Yokohama, JP;
Hiroshi Sasame, Yokohama, JP;
Katsuhiko Nishimura, Yokohama, JP;
Hiroto Hasegawa, Kawasaki, JP;
Hideyuki Yano, Yokohama, JP;
Tatsunori Ishiyama, Yokohama, JP;
Hideo Nanataki, Tokyo, JP;
Harumi Kugoh, Kawasaki, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A developing apparatus having a container for containing a one component developer, and a rotatable developing roller disposed facing an image bearing member to carry developer from the container to a development zone where it is supplied to an electrostatic latent image carried on an image bearing member. The developing roller includes a metal base member and a resin coating layer thereon in which fine conductive particles are dispersed. The developing roller has a surface including an end region adjacent an end of the roller, and an intermediate region. In the end region, the base member is not roughened and the resin layer is not provided. In the intermediate region, inside the end region, the base member is roughened and is coated with the resin layer. A sealing member is provided for preventing leakage of the developer from the container at the end of the developing roller, the sealing member being faced to the end region of the developing roller.