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:
Sep. 02, 2014
Filed:
Feb. 02, 2011
Katsumi Masuda, Kanagawa, JP;
Takamasa Ozeki, Kanagawa, JP;
Nobuyuki Taguchi, Kanagawa, JP;
Yuuki Satoh, Kanagawa, JP;
Toshiki Hayashi, Kanagawa, JP;
Kyohta Koetsuka, Kanagawa, JP;
Toshio Kojima, Kanagawa, JP;
Masayuki Ohsawa, Kanagawa, JP;
Noriyuki Kamiya, Kanagawa, JP;
Takumi Terasaka, Kanagawa, JP;
Katsumi Masuda, Kanagawa, JP;
Takamasa Ozeki, Kanagawa, JP;
Nobuyuki Taguchi, Kanagawa, JP;
Yuuki Satoh, Kanagawa, JP;
Toshiki Hayashi, Kanagawa, JP;
Kyohta Koetsuka, Kanagawa, JP;
Toshio Kojima, Kanagawa, JP;
Masayuki Ohsawa, Kanagawa, JP;
Noriyuki Kamiya, Kanagawa, JP;
Takumi Terasaka, Kanagawa, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A development device includes a developer container, a developer carrier, exposed partly from a casing, facing a latent image carrier in a development area, a magnetic field generator inside the developer carrier, having multiple magnetic poles including a conveyance pole to convey the developer downstream from the development area to a developer release portion, a developer agitator, and a developer regulator. A predetermined gap is kept between an outer surface of the developer carrier and an inner wall of the casing downstream from an opening of the casing, upstream from a developer release portion, in a direction in which the developer carrier rotates. Multiple recesses are formed in the outer surface of the developer carrier at a pitch in a circumferential direction shorter than half a width of a magnetic flux density of the developer conveyance pole in a direction perpendicular to an axial direction of the developer carrier.