Image forming apparatus usable with a carrier having magnetizati

Details Image forming apparatus usable with a carrier having magnetizati Image forming apparatus usable with a carrier having magnetizati

1993-06-29

1995-08-01

Grimley, A. T.

Photocopying

Contact printing

Light boxes

118657, 355239, 347140, G03G 1509

Patent

active

054383943

ABSTRACT:
An image forming apparatus includes an image bearing member; a latent image forming device for forming on the image bearing member a dot distribution electrostatic latent image in accordance with image signals corresponding to an object image; a developing device for developing the latent image formed on the image bearing member by the latent image forming device, in a developing station and by a developer containing toner and magnetic carrier; wherein the developing device includes a developer carrying member for carrying and conveying the developer to the developing station, and a magnetic field generating device provided within the developer carrying member, for forming a magnetic brush of the developer and contacting the magnetic brush to the image bearing member; and wherein a degree .sigma.d (emu/cm.sup.3) of magnetization of the magnetic carrier by a magnetic field by the magnetic field generating means at a peak of a perpendicular magnetic field on the surface of the developer carrying member satisfies the following:

REFERENCES:
patent: 4336546 (1982-06-01), Edwards et al.
patent: 4387664 (1983-06-01), Hosono et al.
patent: 4391512 (1983-07-01), Nakamura et al.
patent: 4627703 (1986-12-01), Suzuki et al.
patent: 4743937 (1988-05-01), Martin
patent: 4755847 (1988-07-01), Matsushiro et al.
patent: 4876574 (1989-10-01), Tajima et al.
patent: 5038158 (1991-08-01), Ayers et al.
patent: 5051782 (1991-09-01), Yamaji
patent: 5110705 (1992-05-01), Hosoya et al.

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