Voice coil motor magnets and method of fabrication thereof
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United States of America Patent
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-
Aug 3, 2004
Grant Date -
Dec 26, 2002
app pub date -
Apr 26, 2002
filing date -
May 8, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Permanent magnet for voice coil actuator motors used to actuate head-arm assemblies in small form disk drives are produced from a dispersion of prealloyed rare earth magnetic particles in a thermoplastic binder. Upon shaping of green parts the magnetic axis of the particles is aligned with the field lines of a magnetic field. Following extraction of the binder the green parts are sintered to net shape. Improved magnetic properties, smaller dimensions, better than tolerances and 100% material utilization are claimed.
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