Magnetic brush developing process and developer
US5310617A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 5, 1990 |
| Grant date | May 10, 1994 |
| Priority date | — |
| Expiry date | Oct 5, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G9/10
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Disclosed are a two-component type developer which is supplied to an area where a bias voltage of at least 250 V is applied, and a developing process using this developer. In this developer, by adjusting the particle size distribution of carrier particles within a specific range, occurrence of the so-called carrier dragging phenomenon of the transfer of the carrier together with the toner to a photosensitive material can be prevented. This adjustment of the particle size distribution is such that the content of carrier particles having a size smaller than 250 mesh is less than 8% by weight based on the entire carrier particles, the diameter D.sub.50 of the weight average particle size corresponding to 50% of the weight of the entire carrier particles is in the range of from 80 to 120 .mu.m and the difference between D.sub.25 and D.sub.75 is in the range of from 5 to 20 .mu.m.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.