Magnetic carrier and two-component developer
US7939233B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 21, 2010 |
| Grant date | May 10, 2011 |
| Priority date | — |
| Expiry date | Jan 21, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G9/1132
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A magnetic carrier and a two-component developer are provided which have remedied blank areas, fog after leaving, carrier sticking during running, and image density variations before and after running. The magnetic carrier has magnetic carrier particles having at least porous magnetic core particles and a resin. The magnetic carrier particles satisfying the specific conditions (a), (b) and (c) where, in a reflected electron image of cross sections of the magnetic carrier particles as photographed with a scanning electron microscope, straight lines that divide a cross section of a magnetic carrier particle into 72 at intervals of 5° are drawn from a reference point of the cross section thereof toward the surface of the magnetic carrier particle; the magnetic carrier particles being contained in an amount of 60% by number or more.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.