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:
Aug. 27, 2002
Filed:
Feb. 28, 2001
Applicant:
Inventors:
Tsukuru Kai, Kanagawa, JP;
Nobutaka Takeuchi, Kanagawa, JP;
Takeyoshi Sekine, Tokyo, JP;
Nobuo Takami, Kanagaw, JP;
Osamu Ariizumi, Kanagaw, JP;
Assignee:
Ricoh Company, Ltd., Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G03G 1/509 ;
U.S. Cl.
CPC ...
G03G 1/509 ;
Abstract
An image forming apparatus of the present invention includes a developing roller accommodating a magnet roller therein. The magnet roller includes a main pole forming a magnetic flux whose attenuation ratio is 40% or above in the direction normal to the developing roller. The axis A of the developer carrier, the axis B of the image carrier and the peak C of the magnetic force of the main pole in the above direction are positioned such that an angle between a line AB and a line AC is substantially zero degree.