EP 0658826 A1 19950621 - A magnetic brush developing apparatus.
Title (en)
A magnetic brush developing apparatus.
Title (de)
Entwicklungsgerät mit magnetischer Bürste.
Title (fr)
Appareil de développement de type brosse magnétique.
Publication
Application
Priority
- EP 91307747 A 19910822
- JP 23390690 A 19900903
Abstract (en)
A magnetic brush developing apparatus, comprising: a development container for containing a developer (4); a magnet (1b) stationarily located in the development container (7) and having magnetic poles radially provided on a plurality of points; a rotational sleeve (1a) arranged to cover the outer circumference of the magnet (1b) and rotatably driven to carry the developer (4) in the development container (7); and a blade (2) arranged opposite to the rotational sleeve (1a) to restrict the amount of the developer (4) which is carried by the rotational sleeve (1a). To obtain a uniform image quality without unevenness among different developing apparatus and a wider range of assembling precision to thus facilitate the installment of the apparatus, at the position (6a) facing the developer restriction member (2), and in its vicinity (6), there is formed a uniform magnetic flux density section (Z) having a magnetic flux density whose component normal to the sleeve (1a) is substantially uniform on the periphery of the rotational sleeve (1a). Two magnetic poles having different polarity have a third magnetic pole placed between them. This third pole faces the blade. The uniform magnetic flux density section is formed by these three magnetic poles. <IMAGE>
IPC 1-7
IPC 8 full level
G03G 15/09 (2006.01)
CPC (source: EP KR)
G03G 15/09 (2013.01 - EP KR); G03G 15/0921 (2013.01 - EP)
Citation (search report)
- [AD] US 4825241 A 19890425 - SAIJO HIROMITSU [JP], et al
- [AD] US 4851872 A 19890725 - MURASAKI HIROSHI [JP], et al
- [A] US 4800412 A 19890124 - UEDA MASAHIDE [JP]
- [X] PATENT ABSTRACTS OF JAPAN vol. 013, no. 422 (P - 933) 20 September 1989 (1989-09-20) & US 4959692 A 19900925 - HAYASHI YUJI [JP], et al
Designated contracting state (EPC)
DE GB
DOCDB simple family (publication)
EP 0474409 A2 19920311; EP 0474409 A3 19920826; EP 0474409 B1 19951025; DE 69114089 D1 19951130; DE 69114089 T2 19960404; DE 69124120 D1 19970220; DE 69124120 T2 19970417; EP 0658826 A1 19950621; EP 0658826 B1 19970108; KR 920007427 A 19920428; KR 950001827 B1 19950303
DOCDB simple family (application)
EP 91307747 A 19910822; DE 69114089 T 19910822; DE 69124120 T 19910822; EP 95102168 A 19910822; KR 910015308 A 19910903