Developing unit and image forming apparatus employing the same

Details Developing unit and image forming apparatus employing the same Developing unit and image forming apparatus employing the same

2011-04-19

2011-04-19

Porta, David P (Department: 2884)

Electrophotography

Image formation

Development

C399S104000, C399S276000, C399S356000

Reexamination Certificate

active

07929888

ABSTRACT:
A developing unit which forms an image on a photosensitive medium, includes a housing which accommodates a developer, a magnetic cylinder having a catch pole which picks up the developer in the housing by a magnetic force, and a main pole which couples a carrier among the picked-up developer, a sleeve rotatably installed on a circumference of the magnetic cylinder to form a magnetic brush having a predetermined width on the circumference by the developer picked up by the catch pole, and a sealing member provided at opposite end parts in an axial direction of the sleeve to prevent a leak of the developer, wherein a width Wsof the sleeve, a magnetized width WMof the main pole, a magnetized width Wcof the catch pole, and a width WBof the magnetic brush satisfy WS>WM>WB>WC.

REFERENCES:
patent: 4246867 (1981-01-01), Hudson
patent: 2003/0103783 (2003-06-01), Nishimura et al.
patent: 2006/0198655 (2006-09-01), Kotera et al.
patent: 2009/0154962 (2009-06-01), Kotera et al.

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