Developing apparatus including a cylindrical developer carrying member conveying a magnetic mono-component developer
US7454160B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 5, 2007 |
| Grant date | Nov 18, 2008 |
| Priority date | — |
| Expiry date | Apr 18, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/0619
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A developing apparatus, a process cartridge and an image forming apparatus which form an image whose image density can be maintained, which form a fogged image and which form an image of uneven density within an acceptable range, even when the diameter of a developer carrying member is not more than 12 mm. The apparatus includes a developer carrying member whose outer diameter is in the range of 8 mm to 12 mm, and a magnetic mono-component developer 43 having a saturation magnetization of in a range of 20 Am2/kg to 37 Am2/kg when the magnetic field of 79.6 kA/m (1000 oersteds) is applied, the magnetization of not less than 70% and not more than 80% of the saturation magnetization when the magnetic field is lowered to 55.7 kA/m (700 oersteds), and the magnetization of not less than 50% and not more than 62% of the saturation magnetization when the magnetic field is lowered to 39.8 kA/m (500 oersteds).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.