Magnetic developer and developing device using same

Details Magnetic developer and developing device using same Magnetic developer and developing device using same

Filed on

1994-11-07

Date issued

1996-04-09

Examiner

Martin, Roland

Patent Class

Radiation imagery chemistry: process, composition, or product th

SubClass

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

SubSubClass

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

Other Related Categories

430110, 430111, 355251, G03G 9083, G03G 9107, G03G 1509

Type

Patent

Status

active

Patent number

055060846

Description

ABSTRACT:
An electrostatic latent image developer containing a carrier, a toner, and an electric field adjusting agent. The electric field adjusting agent is formed as particles having an average particle size smaller than that of the carrier, and contains a magnetic powder in a specific amount less than that of a magnetic powder contained in the carrier and greater than that of a magnetic powder contained in the toner. The magnetic powder may be deposited on the surface of each particle of the electric field adjusting agent to form a conductive layer capable of smoothly taking or imparting charges away from or to the toner. Accordingly, an electric field formed in a gap between a developing sleeve and a photosensitive member can be intensified to thereby prevent an edge effect and enhance a permittivity in this gap. Accordingly, the electrostatic latent image formed on the photosensitive member can be faithfully developed.

REFERENCES:
patent: 3838054 (1974-09-01), Trachtenberg et al.
patent: 4436803 (1984-03-01), Ikeda et al.
patent: 4525447 (1985-06-01), Tanaka et al.
patent: 4578337 (1986-03-01), Oka
patent: 4640880 (1987-02-01), Kawanishi et al.
patent: 4663262 (1987-05-01), Oka et al.
patent: 4683187 (1987-07-01), Goldstein et al.

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