High field voice coil motor
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United States of America Patent
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-
Nov 14, 2006
Grant Date -
Dec 1, 2005
app pub date -
May 11, 2005
filing date -
May 12, 2004
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An embodiment of the invention is a particular arrangement of permanent magnets that generates a higher strength and more uniform magnetic field than existing permanent magnet arrangements for a voice coil motor. The permanent magnet arrangement of an embodiment is based on the Halbach arrangement of permanent magnets. The increased magnetic field strength and uniformity allows for a voice coil motor that is both capable of higher frequency actuations as well as more uniform force over the full stroke of the actuation.
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