Developing device
US9235158B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 26, 2015 |
| Grant date | Jan 12, 2016 |
| Priority date | — |
| Expiry date | Feb 26, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/0921
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A developing device includes a developing sleeve having a plurality of grooves, and a magnetic field generating portion configured to be disposed on an inner side of the developing sleeve and including at least a drawing-up pole and a cut pole. The magnetic field generating portion is configured to form. a Fr attenuation area and a Fθ reverse area between a peak of a magnetic flux density of the drawing-up pole and a peak of a magnetic flux density of the cut pole. Fr attenuates toward the cut pole side from the drawing-up pole side in the Fr attenuation area and Fθ is oriented towards an opposite direction to a direction of rotation of the developing sleeve in the Fθ reverse area. A pitch interval of the plurality of grooves is shorter than a length of the Fθ reverse area in the direction of rotation of the developing sleeve.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.