Developing apparatus

Details Developing apparatus Developing apparatus

2008-06-24

2008-06-24

Ngo, Hoang (Department: 2852)

Electrophotography

Image formation

Development

C399S256000, C399S258000

Reexamination Certificate

active

07391998

ABSTRACT:
The present invention provides a developing apparatus to be provided in a quick start up electrophotographic image forming apparatus that can efficiently prevent generation of unevenness by a screw pitch in a short period of time. The developing apparatus rotates a developer transporting screw so as to transport and supply a developer to a developer bearing member, and develops a latent image formed on an image bearing member by the developer. The developer transporting screw includes a vane winding around a rotation shaft in a spiral form. A vane surface on other side of a developer transport direction of the vane includes two planes having different angles with a rotational center line of the rotation shaft. Relationships of θ2<θ1and 10°≦θ2≦60° are satisfied, where θ1denotes an angle between: the plane that has a longer distance from the rotational center line; and the rotational center line, and θ2denotes an angle between: the face that has a shorter distance from the rotational center line; and the rotational center line.

REFERENCES:
patent: 2004/0057755 (2004-03-01), Yamaguchi et al.
patent: 2004-117507 (2004-04-01), None
patent: 2004-151326 (2004-05-01), None
English language Abstract of JP 2004-117507.
English language Abstract of JP 2004-151326.

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