Electrophotographic method and apparatus using magnetic toner

Details Electrophotographic method and apparatus using magnetic toner Electrophotographic method and apparatus using magnetic toner

1993-05-12

1995-11-07

Goodrow, John

Radiation imagery chemistry: process, composition, or product th

Electric or magnetic imagery, e.g., xerography,...

Post imaging process, finishing, or perfecting composition...

4301066, 355251, G03G 1309

Patent

active

054647207

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 less than 0.06.times.r.times..rho. mg/cm.sup.2. Also, an image forming apparatus is disclosed.

REFERENCES:
patent: 5032485 (1991-07-01), Kanbe et al.
patent: 5232805 (1993-08-01), Misawa et al.
patent: 5239342 (1993-08-01), Kubo et al.
patent: 5258253 (1993-11-01), Fukumoto et al.

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