Two-component developer, two-component developer holding container, and electrophotographic image formation apparatus equipped with the container
US6258502A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 30, 2000 |
| Grant date | Jul 10, 2001 |
| Priority date | — |
| Expiry date | May 30, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G9/108
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A two-component developer includes a magnetic carrier including magnetic carrier particles with an average particle diameter of 35 .mu.m to 100 .mu.m, and a toner including toner particles with a weight-average particle diameter of 6.0 .mu.m to 11.5 .mu.m, to which at least one additive is externally added thereto in an amount of 0.3 to 1.5 wt. % to the toner, the toner particles including (a) toner particles with a particle diameter of 5 .mu.m or less with a content ratio of 15% or less by number, and (b) toner particles with such a particle diameter that is two times or greater than the weight-average particle diameter of the toner particles with a content ratio of 5% or less by volume, the toner particles satisfying a relationship of 0.60.ltoreq.D25/D75.ltoreq.0.85 as defined in the specification. A container in which the two-component developer is contained, and an electrophotographic image formation apparatus in which the container is incorporated are proposed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.