Development apparatus, image forming apparatus and developing method that employ a magnetic brush
US7697873B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 26, 2007 |
| Grant date | Apr 13, 2010 |
| Priority date | — |
| Expiry date | Oct 9, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/0609
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In a development apparatus of the hybrid method using a component developer, a development apparatus and a development method are provided that prevent the reduction of density or the occurrence of residual images (ghost images) and can carry out good image forming over a long period of time. A development apparatus has the feature that the surfaces of the toner supporting member and the developer supporting member move in a mutually opposite direction at the part where they are opposite to each others. The development apparatus further employs an electric field in the closest part applied in a direction to recover the toner from the toner supporting member to the developing supporting member, wherein the magnitude of the electric field is in the range from 2.5×106 V/m to 5×106 V/m. The developer of the development apparatus is such that its share (PD) in the space of the closest part of the opposing portion satisfies the following relationship: 0.09≦PD≦650×Dss.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.