Magnetic roller for use in a developing device
US5129358A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 12, 1991 |
| Grant date | Jul 14, 1992 |
| Priority date | — |
| Expiry date | Aug 12, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/0921
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A magnetic roller is fixedly mounted in a developing device provided in an image forming apparatus. The magnetic roller includes a magnetic member, which is made of a mixture of ferromagnetic material and polymeric compound. A plurality of magnetic poles are formed along the periphery of the magnetic member and consist of a main magnetic pole confronting an electrostatic latent image support member of the image forming apparatus, at least two magnetic poles formed adjacent to each other on one side of the main magnetic pole and having a polarity opposite to the polarity of the main magnetic pole, and at least two magnetic poles formed adjacent to each other on the other side of the main magnetic pole and having a polarity opposite to the polarity of the main magnetic pole.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.