Developing device for an image forming apparatus
US6033818A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 21, 1998 |
| Grant date | Mar 7, 2000 |
| Priority date | — |
| Expiry date | Sep 21, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/0869
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In an image forming apparatus, a developing device operable with toner or single component type developer has a hard first developing roller and a soft second developing roller. Fine magnetic N-S poles are formed on the periphery of the first roller. The second roller conveys the toner, electrostatically transferred thereto from the first roller, to an image carrier. The device frees a toner image from deterioration due to toner particles charged to a polarity opposite to an expected polarity. The toner forms a uniform thin layer on the first roller and is uniformly charged. Toner for use with this type of developing device is also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.