Developing device

Details Developing device Developing device

1999-01-13

2000-03-07

Grimley, Arthur T.

Electrophotography

Image formation

Development

399272, 399282, G03G 1500

Patent

active

060351691

ABSTRACT:
In a developing device comprising a developing member for transferring toner onto an electrostatic latent image for visualization, and a developer supplying member for magnetically attracting two-component developer on the peripheral surface for conveyance, and supplying two-component developer or toner to the developing member, the developer will be sufficiently agitated on the developer supplying member, and toner density and amount of toner charge in the two-component developer will be controlled with simple structure. A part of two-component developer, to which toner has been supplied on the developer supplying member, is caused to flow back on the upstream side in the conveying direction within a range in which the attracting force of magnetic poles of the internal member which the developer supplying member has acts. The internal member is caused to be rotationally moved, and a fluctuating magnetic field is formed between the internal member and the magnet arranged to face to it to thereby cause the reflux. Also, a rotating member which mechanically causes the reflux may be provided. Further, it may be possible to rotationally move the magnetic poles of the developer supplying member and to form an alternating electric field between the developer supplying member and an electrode opposite thereto for thereby causing the reflux.

REFERENCES:
patent: 4595277 (1986-06-01), Maczuszenko et al.
patent: 5689782 (1997-11-01), Murakami et al.
patent: 5708942 (1998-01-01), Sugiyama et al.
patent: 5765080 (1998-06-01), Bogoshian
patent: 5768666 (1998-06-01), Ito et al.
patent: 5832350 (1998-11-01), Kumasaka et al.
patent: 5943537 (1999-08-01), Ahn

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