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. 15, 1996
Filed:
Sep. 01, 1995
Eiji Sawa, Fujisawa, JP;
Ryuta Tanaka, Yokohama, JP;
Yuichiro Mori, Yokohama, JP;
Tokuo Okada, Yokohama, JP;
Yoshio Takizawa, Fussa, JP;
Koji Takagi, Kodaira, JP;
Takahiro Kawagoe, Tokorozawa, JP;
Bridgestone Corporation, Tokyo, JP;
Abstract
A developing roller comprising a conductive layer formed around a shaft carries a non-magnetic one-component developer on its outer surface to form a thin film of the developer and contacts a photoconductor drum having an electrostatic latent image borne on its surface whereby the latent image is developed to form a toner image. In one embodiment, the surface of the conductive layer has a DIN 4776 core roughness depth Rk of 0.5-3.5 .mu.m in a circumferential direction of the roller, and the ratio of circumferential Rk to axial Rk is greater than 1.0. In another embodiment, the surface of the conductive layer is provided with microscopic ridges and recesses which are alternately disposed in a rotational direction to define wavy streaks having a longitudinal direction substantially aligned with an axial direction of the roller.