Developing apparatus
US7391998B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 14, 2006 |
| Grant date | Jun 24, 2008 |
| Priority date | — |
| Expiry date | Sep 22, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/0833
- WIPO fieldOptics
- WIPO sectorInstruments
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<θ1 and 10°≦θ2≦60° are satisfied, where θ1 denotes an angle between: the plane that has a longer distance from the rotational center line; and the rotational center line, and θ2 denotes an angle between: the face that has a shorter distance from the rotational center line; and the rotational center line.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.