Electrophotographic method and apparatus using magnetic toner
US5464720A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 12, 1993 |
| Grant date | Nov 7, 1995 |
| Priority date | — |
| Expiry date | May 12, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G9/0838
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An image forming method is disclosed which comprises forming a latent image on a latent image bearing member, carrying a magnetic toner onto a developer carrying member provided with a magnetic field forming means, forming on the developer carrying member a layer of the magnetic toner, and developing the latent image while transferring the magnetic toner to the latent image bearing member. The magnetic toner contains a magnetic material having an intensity of magnetization of from 10 emu/g to 40 emu/g in a magnetic field of 1K oersted and formed of a metal oxide having a horizontal direction Feret's diameter of from 0.05 .mu.m to 0.5 .mu.m, and chainlike masses of the magnetic toner, formed on the developer carrying member, are in a density of not less than 8.times.10.sup.4 ears/cm.sup.2 in a developing zone formed between the latent image bearing member and developer carrying member. The chainlike masses each have a length of not more than 180 .mu.m, and when the weight average particle diameter of the magnetic toner is r (.mu.m) and the true density thereof is .rho. (g/cm.sup.3), the magnetic toner on the developer carrying member in the developing zone is in a quantity of not le…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.