Developing roller, and developing device and image-forming...

Details Developing roller, and developing device and image-forming... Developing roller, and developing device and image-forming...

2007-07-09

2009-08-18

Tran, Hoan H (Department: 2852)

Electrophotography

Image formation

Development

C399S282000

Reexamination Certificate

active

07577388

ABSTRACT:
A developing roller includes (I) a developing sleeve that is made of nonmagnetic material, and that holds and conveys a developer; and (II) a magnetic member that is fixed inside the developing sleeve, wherein the magnetic member includes (i) a development magnetic pole that corresponds to a development area; (ii) a before-development magnetic pole that is provided at an upstream side of the developer-conveying direction with respect to the development magnetic pole, and that has a polarity different from the development magnetic pole; and (iii) an after-development magnetic pole that is provided at a downstream side of the developer-conveying direction with respect to the development magnetic pole, and that has a polarity different from the development magnetic pole, wherein q1, q2and q3satisfy the following formulasin-line-formulae description="In-line Formulae" end="lead"?q1>90°; andin-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?q1+q2>q3,in-line-formulae description="In-line Formulae" end="tail"?wherein q1, q2and q3are defined in the specification.

REFERENCES:
patent: 4177757 (1979-12-01), Murakawa et al.
patent: 6021295 (2000-02-01), Ochiai et al.
patent: 7352983 (2008-04-01), Kamiya et al.
patent: A 11-161007 (1999-06-01), None
patent: A 2003-005529 (2003-01-01), None
patent: B2 3410329 (2003-03-01), None

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