Developing apparatus having magnetic field generating portion
US10739703B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 24, 2019 |
| Grant date | Aug 11, 2020 |
| Priority date | — |
| Expiry date | Jul 24, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/0121
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A developing apparatus includes a developer rotary member, a magnetic field generating portion, and a magnet portion. If an area of the magnet portion on an inner side from the end portion of the magnetic field generating portion with respect to the rotational axis direction of the developer rotary member is defined a first magnet area and an area of the magnet portion on an outer side from the end portion with respect to the rotational axis direction is defined a second magnet area, an average value of a component, in a normal direction of the developer rotary member, of a magnetic flux density of the magnet portion in the second magnet area is greater than an average value of a component, in a normal direction of the developer rotary member, of a magnetic flux density of the magnet portion in the first magnet area by 100 gauss or more.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.