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:
Sep. 03, 1996
Filed:
Dec. 28, 1994
Eisaku Murakami, Hiratsuka, JP;
Kazuhiro Yuasa, Zama, JP;
Shuichi Endoh, Isehara, JP;
Iwao Matsumae, Tokyo, JP;
Yoshiaki Tanaka, Kawasaki, JP;
Hiroshi Hosokawa, Yokohama, JP;
Mugijiroh Uno, Isehara, JP;
Hiroshi Saitoh, Ayase, JP;
Eiji Takenaka, Isehara, JP;
Toshihiro Sugiyama, Atsugi, JP;
Tetsuo Yamanaka, Tokyo, JP;
Satoru Komatsubara, Atsugi, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A developing device for an image forming apparatus and using a single component type developer, i.e., toner, has a developing roller, a doctor blade, and an elastic intermediae roller. The developing roller and intermediate roller contact each other and rotate in the same directions such that they move in opposite directions at the position where they contact each other. The developing roller is provide with a surface roughness of Rz 10 .mu.m or less in terms of ten-point mean value as prescribed by JIS (Japanese Industrial Standards) in order to deposit an adequate charge on toner.