Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – Magnet structure or material
Patent
1992-04-03
1994-06-07
Picard, Leo P.
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
Magnet structure or material
118657, 355251, 355118, H01F 300, G03G 1509, G03B 2704
Patent
active
053193377
ABSTRACT:
A machine part used as a magnet roll for developing and a process for producing the same. The machine part constitutes a member of a developing machine for an electrophotographic process such as a copier and facsimile, and a laser printer as well. The machine part comprises a shaft having a resin-bonded magnet layer provided on the outer periphery thereof. The composite molding of a resin-bonded magnet is produced by molding and establishing a composition for a thermoplastic resin-bonded magnet comprising from 35 to 60 % by volume of a thermoplastic resin and from 40 to 65 % by volume of a hard ferrite powder into a cylinder of uniform thickness on the outer periphery of a shaft, obtained is a thin resin-bonded magnet layer having a surface roughness of 5 .mu.m or less and free of seams which have generated during molding, the thin resin-bonded magnet layer further having provided on the surface a plurality of magnetic poles at a small spacing.
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European Search Report, Application No. EP 92 10 5784, dated May 21, 1993, The Hague.
Ishimaru Toshiaki
Kakehashi Yasushi
Matsunari Yasunori
Miki Shogo
Kanegafuchi Kagaku Kogyo & Kabushiki Kaisha
Picard Leo P.
Ryan Stephen T.
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