Developing apparatus, process cartridge, and image forming apparatus
US7412190B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 12, 2006 |
| Grant date | Aug 12, 2008 |
| Priority date | — |
| Expiry date | Aug 29, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/0819
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present invention provides a developing apparatus and an image forming apparatus which are capable of outputting stable images with no surface staining and toner scattering even when an image forming process is repeated over a long time period, or even when image formation is performed after special use conditions in which little toner is consumed have continued over a long time period. An area in which a relationship of 0.6<Vlocal/Vaverage<0.9, where Vaverage is an average flow speed of a developer during one circuit of a developing container and Vlocal is a local flow speed of the developer as it moves through the developing container, is satisfied exists in the developing container, and a negatively charged toner maintains a relationship of μ0 (t)≧μ1 (t) between an electrostatic charge distribution peak position μ0 (t) of toner in an external force imparting developer and an electrostatic charge distribution peak position μ1 (t) of a replenishing toner, this relationship being measured in a deteriorated toner testing method.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.