Carrier for use in electrophotography, two component-type developer and image forming method
US5576133A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 13, 1995 |
| Grant date | Nov 19, 1996 |
| Priority date | — |
| Expiry date | Jul 13, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G9/1075
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A two component-type developer for electrophotography showing improved electrophotographic performances and also free from carrier adhesion (undesirable carrier transfer to the photosensitive member and recording materials) is constituted by using a magnetic carrier of 5-100 .mu.m in particle size. The carrier has a bulk density of at most 30 g/cm.sup.3, and magnetic properties including: a magnetization of 30-150 emu/cm.sup.3 under a magnetic field strength of 1000 oersted, a magnetization (residual magnetization .sigma..sub.r) of at least 25 emu/cm.sup.3 under a magnetic field strength of zero oersted, a coercive force of less than 300 oersted, and a relationship of: EQU .vertline..sigma..sub.1000 -.sigma..sub.300 .vertline./.sigma..sub.1000 .ltoreq.0.40 wherein .sigma..sub.1000 and .sigma..sub.300 denote magnetizations under magnetic field strength of 1000 oersted and 300 oersted, respectively.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.