Rare earth magnet rotors for watch movements and method of fabrication thereof
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Dec 16, 2003
Grant Date -
Dec 5, 2002
app pub date -
Mar 11, 2002
filing date -
Apr 13, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Rotors for stepping motors used in analog timepieces are produced from a mixture of prealloyed rare earth magnetic particles and a thermoplastic binder. The mixture is either tape cast in a magnetic field following blanking of green rotors or injection molded in a magnetic field. Following extraction of the binder the green parts are sintered to net shape. Improved magnetic properties, smaller dimensions, better tolerances and 100% material utilization are claimed.
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