Magnet roll and method of producing same

Details Magnet roll and method of producing same Magnet roll and method of producing same

1993-10-01

1996-07-23

Picard, Leo P.

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

Magnet structure or material

29607, 335306, 335284, 118657, 355251, H01F 720, H01F 1300

Patent

active

055393683

ABSTRACT:
The magnet roll of the present invention includes a shaft and a permanent magnet member fixed to the shaft, the permanent magnet member being composed of a hollow, cylindrical magnet body, and a magnetic pole piece fixed to a recess of the hollow, cylindrical magnet body, the hollow, cylindrical magnet body having a plurality of axially extending magnetic poles arranged circumferentially on the surface, the magnetic pole piece being provided with two magnetic poles having the same polarity for constituting a developing magnetic pole, and a thermally demagnetized portion being formed substantially at a center of the developing magnetic pole such that the permanent magnet member generates a magnetic flux density distribution having two peaks of the same polarity at a position of the developing magnetic pole.

REFERENCES:
patent: 4331100 (1982-05-01), Mochizuki et al.
patent: 5089060 (1992-02-01), Bradley et al.
patent: 5091021 (1992-02-01), Perry et al.
patent: 5200729 (1993-04-01), Soeda et al.

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