Developing apparatus

Details Developing apparatus Developing apparatus

1994-01-25

1995-08-15

Grimley, A. T.

Photocopying

Contact printing

Light boxes

355245, 430108, G03G 1509

Patent

active

054424259

ABSTRACT:
A twin magnetic pole type developing apparatus of the present invention includes a rotatable sleeve enclosing a non-rotatable magnetic member therein. The magnetic member has two magnetic poles of the same polarity which are positioned so as to confront a developing region in neighboring relation with each other. Developer material to be used is a two-component type developer material consisting of toner particles and carrier particles. Especially, the carrier particles have an average particle size of 25 .mu.m or more and are capable of being magnetized to an intensity of magnetization of 30 emu/g or more. Further, a packing density in the developing region ranges from 5% to 40%. Consequently, the developer material can contact with an electrostatic latent image formed on a photoreceptor to develop it into the image of high density.

REFERENCES:
patent: 3939801 (1976-02-01), Tanaka et al.
patent: 4331100 (1982-05-01), Mochizuki et al.
patent: 4666814 (1987-05-01), Suematsu et al.
patent: 4911100 (1990-03-01), Yamashita
patent: 4960070 (1990-10-01), Nishimura
patent: 5212525 (1993-05-01), Noami et al.

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