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. 07, 1995
Filed:
Sep. 28, 1993
Kunihiko Sato, Kawasaki, JP;
Sachio Sasaki, Kawasaki, JP;
Akira Nagahara, Kawasaki, JP;
Shin Araki, Kawasaki, JP;
Hideaki Iwasaki, Kashiwa, JP;
Kenji Fuke, Kawasaki, JP;
Futoshi Okabayashi, Hyogo, JP;
Takamasa Araki, Hyogo, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A magnetic brush developing apparatus, comprising: a development container (102) for containing a developer; a magnet (122) stationarily located in the development container and having magnetic poles radially provided on a plurality of points; a rotational sleeve (121) arranged to cover the outer circumference of the magnet and rotatably driven to carry the developer in the development container to an image carrying body (131); and a blade (123) arranged opposite to the sleeve to restrict the amount of the developer which is carried by the sleeve. Two of the magnetic poles are a developing magnetic pole (Pd) facing opposite to the image carrying body (131) and a developer transfer magnetic pole (Pt) located between the developing magnetic pole (Pd) and the blade (123). A magnetic brush of the developer formed on the sleeve (121) by the developer carrying magnetic pole (Pt) has a magnetic flux density. A width or angle of a region where a radial component of the magnetic flux density exceeds over a half of a maximum value thereof, i.e., a half value width, is determined in such a manner that the developer is prevented from flying away from the magnetic brush.