Developing unit and developing roll contained therein

Details Developing unit and developing roll contained therein Developing unit and developing roll contained therein

1999-10-12

2000-12-05

Lee, Susan S.Y.

Electrophotography

Image formation

Development

G03G 1509

Patent

active

061578037

ABSTRACT:
A developing unit has a developer housing and a developing roll contained therein, the developer housing holding a two-component developer composed of carrier and toner. The developing roll is placed facing the opening of the developer housing and provided with a magnet member and a developing sleeve. The magnet member has multiple magnetic poles fixed thereto, and the developing sleeve is rotatably slipped on the magnet member. The developing sleeve is formed from an aluminum substrate by roughening its surface and subsequently etching the roughened surface so that the resulting etched part has an average slope angle of 15 to 20.degree..

REFERENCES:
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patent: 4982689 (1991-01-01), Honda et al.
patent: 5387966 (1995-02-01), Karashima
patent: 5565968 (1996-10-01), Sawa et al.
patent: 5608502 (1997-03-01), Yamashita et al.
patent: 5729805 (1998-03-01), Chiba et al.
patent: 5749033 (1998-05-01), Swartz et al.

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