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:
May. 19, 2009
Filed:
Apr. 03, 2006
Yasuo Miyoshi, Kanagawa, JP;
Yasuo Miyoshi, Kanagawa, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A developing device of the present invention includes a photosensitive drum and a developing roller facing the drum. The developing roller accommodates a stationary magnet roller that forms on the surface of the developing roller a scoop-up pole for scooping up the developer stored in the developing device onto the developing roller and a release pole adjoining the scoop-up pole for causing part of the developer moved away from a developing zone to be released from the developing roller between it and the scoop-up pole. The scoop-up pole, which is of the same polarity as the release pole, is configured such that a position where the flux density thereof in the direction normal to the surface of the developing roller is maximum is located closer to the release pole than a position on the above surface corresponding to the center of a range in which the above flux density is halved.