Yoke-integrated magnet
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United States of America Patent
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Issued Date -
Mar 26, 2009
app pub date -
Sep 5, 2008
filing date -
Sep 7, 2007
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The present invention provides a yoke-integrated magnet, including: a ring-shaped bond magnet containing a rare earth iron-based alloy magnetic powder and a synthetic resin binder; and a ring-shaped back yoke provided on an inner periphery or an outer periphery of the bond magnet to be integral with the bond magnet, in which at least a surface of the bond magnet at which the bond magnet does not contact with the back yoke is covered with an injection molding layer of a thermoplastic resin which does not contain tin. The yoke-integrated magnet of the invention is excellent in corrosion resistance and dimension accuracy and is free from the risk of contamination with tin.
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