Developing device and image forming apparatus including the same
US11914312B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 6, 2022 |
| Grant date | Feb 27, 2024 |
| Priority date | — |
| Expiry date | Jul 6, 2042 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/0609
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A developing device includes a developing container storing a two-component developer containing a magnetic carrier and a toner, a developer carrying member carrying the developer on its outer circumferential surface, and a regulation member arranged to be opposed at a prescribed distance to the developer carrying member. The developer carrying member includes a developing sleeve on which a magnetic brush is formed, and a magnet secured in the developing sleeve and having a plurality of magnetic poles including a regulation pole opposed to the regulation member and a downstream-side magnetic pole arranged downstream of the regulation pole with respect to the rotation direction of the developing sleeve. The magnet is such that the vertical magnetic force gradient [mT/°] has a local minimum value near a position at which the vertical magnetic force is 0 [mT] between the downstream-side surface of the regulation member and the downstream-side magnetic pole.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.