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. 13, 2012
Filed:
Dec. 23, 2008
Developing device, process cartridge, and image forming apparatus, method of developing latent image
Yasuo Miyoshi, Kanagawa, JP;
Hisashi Kikuchi, Kanagawa, JP;
Norio Kudo, Kanagawa, JP;
Nobuo Iwata, Kanagawa, JP;
Tsukuru Kai, Kanagawa, JP;
Yasuo Miyoshi, Kanagawa, JP;
Hisashi Kikuchi, Kanagawa, JP;
Norio Kudo, Kanagawa, JP;
Nobuo Iwata, Kanagawa, JP;
Tsukuru Kai, Kanagawa, JP;
Ricoh Company, Limited, Tokyo, JP;
Abstract
A developing device includes a first screw that supplies a developer to a developing roller while agitating/conveying the developer in a first direction, and a screw that collects residual developer from the developing roller, agitates/conveys the residual developer in a second direction opposite to the first direction, and delivers the residual developer to the first screw. Between two points that a magnetic flux density in a normal direction of a magnetic field formed in a developer separating magnetic pole in the developing roller become substantially zero, a point at a downstream side in a rotating direction of the developing roller is formed at an upstream side to a developing roller rotating direction, than a line joining the center of the developing roller and the center of the second screw.