Magnet roller and manufacturing method thereof

Details Magnet roller and manufacturing method thereof Magnet roller and manufacturing method thereof

1998-03-05

2000-02-01

Braun, Fred L

Electrophotography

Image formation

Development

335296, 335302, 335306, 399279, 492 8, G03G 1509

Patent

active

060212969

ABSTRACT:
A magnet roller capable of adjusting the height and position of a magnetic force peak after formation of a roller, and easily meeting a requirement to attain a complex magnetic force pattern without significantly increasing the cost. In the magnet roller, at least two kinds of first magnet pieces and second magnet pieces different from each other in orientation characteristic of magnetic powders are fixedly disposed around the outer periphery of a shaft. The first magnet pieces is a magnet piece in which anisotropic magnetic powders are oriented in such a manner to converge from both the side surfaces and the back surface to a specific position on the front surface side. The second magnet pieces are one kind or two or more kinds of magnet pieces such as a magnet piece in which anisotropic magnetic powders are oriented at random, a magnet piece in which anisotropic magnetic powders are uniformly or radially oriented in a specific direction from the back surface side to the front surface side, and a magnet piece using isotropic magnetic powders with no orientation characteristic.

REFERENCES:
patent: 4185262 (1980-01-01), Watanabe et al.
patent: 4326908 (1982-04-01), Hiya et al.
patent: 4509031 (1985-04-01), Sakata et al.
patent: 4536230 (1985-08-01), Landa et al.
patent: 4557582 (1985-12-01), Kan et al.
patent: 4558294 (1985-12-01), Yamashita
patent: 5529628 (1996-06-01), Fuchiwaki et al.

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