Bone conduction device
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United States of America Patent
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N/A
Issued Date -
Jul 12, 2007
app pub date -
Mar 4, 2005
filing date -
Mar 5, 2004
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
The object is to provide a bone conduction device. The device is simple in construction, thin in thickness, small in leakage in magnetic flux, excellent in performance, and comprises: abase yoke (1) carrying both a voice coil (3) and a magnet (4); and, a front yoke (5). The yoke (5) assumes a flat plate-like shape and is loosely disposed between: an upper surface of a magnetic pole of the base yoke (1); and, the front yoke (5) to provide a necessary clearance between these yokes. The device is characterized in that the clearance is produced by means of a resilient element (6), which is disposed in an outer peripheral portion of the base yoke (1) to receive the front yoke (5) thereon. Preferably: the base yoke (1) has a circular base (7); and, the resilient element (6) assumes an arcing shape extending along the base (7).
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