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:
Mar. 07, 2000
Filed:
Sep. 21, 1998
Toshihiro Sugiyama, Atsugi, 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;
Tetsuo Yamanaka, Tokyo, JP;
Eisaku Murakami, Hiratsuka, JP;
Satoru Komatsubara, Atsugi, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
In an image forming apparatus, a developing device operable with toner or single component type developer has a hard first developing roller and a soft second developing roller. Fine magnetic N-S poles are formed on the periphery of the first roller. The second roller conveys the toner, electrostatically transferred thereto from the first roller, to an image carrier. The device frees a toner image from deterioration due to toner particles charged to a polarity opposite to an expected polarity. The toner forms a uniform thin layer on the first roller and is uniformly charged. Toner for use with this type of developing device is also disclosed.