Vibration motor
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United States of America Patent
Stats
-
Aug 2, 2011
Grant Date -
Oct 8, 2009
app pub date -
Apr 3, 2009
filing date -
Apr 4, 2008
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A vibration motor includes a rotary shaft, an armature core secured to the rotary shaft and having a plurality of salient poles, an armature coil wound around each of the salient poles except at least one salient pole, a frame serving as an outside cover, a plurality of magnets secured to the frame and having respective different polarities, and a weight adapted to rotate together with the rotary shaft and disposed eccentrically, wherein the weight is disposed inside the frame and secured to the armature core in such a manner that at least a part of the weight is inserted in a hollow provided in at least the one salient pole having no armature coil.
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