Developing device and image forming apparatus including the same
US9864298B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 6, 2017 |
| Grant date | Jan 9, 2018 |
| Priority date | — |
| Expiry date | Apr 6, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/0893
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A developing device includes a housing, a developing roller, a developer stirring member, and a layer thickness regulating member. The developing roller includes a stationary magnet and a sleeve. The stationary magnet includes a first magnetic pole having a specific polarity, and a second magnetic pole lying downstream of the first magnetic pole and having the same polarity as the first magnetic pole. In an entire inter-pole region between the first magnetic pole and the second magnetic pole, the stationary magnet produces a magnetic force including a horizontal component that keeps the specific polarity and has a value greater than zero (mT). The inter-pole region includes a flat area where a horizontal magnetic force component having a minimum absolute value exits and the horizontal magnetic force component changes within a range of 0.5 (mT) or less, the flat area extending over a range of 10 degrees or more.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.