Irregular shaped ferrite carrier and electrophotographic developer using the ferrite carrier
US7598011B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 28, 2006 |
| Grant date | Oct 6, 2009 |
| Priority date | — |
| Expiry date | Nov 19, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G9/1132
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
It is contemplated to provide irregular shaped ferrite carrier which has a lower resistance, a high specific surface area, a low specific gravity and a longer operational life, and an electrophotographic developer comprising the ferrite carrier which prevents the toner scattering, has a high image density, and is responsive to high-speed and color imaging. The irregular shaped ferrite carrier is characterized in that the carrier particles are irregular shaped, and 40 percent by number or more of the particles have a rock candy sugar shape and/or an oyster shell shape, and that the shape factor (SF-1=R2/S×π/4×100, wherein R is a maximum length and S is a projected area.) is 140 to 250, and the distribution width (δ) is 60 or less.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.