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:
Jul. 22, 2003
Filed:
Jun. 05, 2001
Applicant:
Inventors:
Tsukuru Kai, Kanagawa, JP;
Nobutaka Takeuchi, Kanagawa, JP;
Hisashi Shoji, Kanagawa, JP;
Kei Yasutomi, Kanagawa, JP;
Takeyoshi Sekine, Tokyo, JP;
Osamu Ariizumi, Kanagawa, JP;
Assignee:
Ricoh Company, Ltd., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
G03G 1/509 ; G03G 2/100 ;
U.S. Cl.
CPC ...
G03G 1/509 ; G03G 2/100 ;
Abstract
An image forming apparatus including a developing device and an image carrier facing the developing device. The developing device includes a main magnetic pole for causing a developer to magnetically deposit on an outer periphery of a developer carrier in a form of a magnet brush. The image carrier has a coefficient of friction of 0.5 or below, and a flux density in a normal direction has an attenuation ratio of 40% or above.