Magnet roll and developing method using the same

Details Magnet roll and developing method using the same Magnet roll and developing method using the same

1997-03-24

1999-04-27

Grimley, Arthur T.

Electrophotography

Image formation

Development

399270, 399274, 399277, 430122, G03G 1509

Patent

active

058972463

ABSTRACT:
A magnet roll including a cylindrical permanent magnet having a surface thereon a plurality of magnetic poles which extend along an axis of the magnet roll and an electroconductive ceramic layer formed at least on a circumferential surface of the cylindrical permanent magnet. The electroconductive ceramic layer may be TiC, WC, TiN, TiCN, CrN, ZrN, HfN, Ti+TiN, and Cr+CrN. The magnet roll is used in a developing method of developing a latent image on a photosensitive drum by a magnetic developer while applying a bias voltage to a developing zone, in which the number of the magnetic poles (N) satisfies the relation: N.gtoreq.(V.sub.1 /V.sub.2).times..pi.D/6, wherein V.sub.1 is a peripheral speed (mm/s) of the photosensitive drum, V.sub.2 is a peripheral speed of the magnet roll and D is an outer diameter (mm) of the magnet roll.

REFERENCES:
patent: 5384627 (1995-01-01), Behe et al.
patent: 5473418 (1995-12-01), Kazakos et al.
patent: 5541793 (1996-07-01), Schwarz
patent: 5565966 (1996-10-01), Ochiai et al.
patent: 5634182 (1997-05-01), Asanae et al.
patent: 5659861 (1997-08-01), Yamashita et al.

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