| 摘要 |
PROBLEM TO BE SOLVED: To offer a voice coil and a speaker which have a high propagation speed, are lightweight, have high strength, and can transmit vibration at high efficiency. SOLUTION: The voice coil comprises a wooden bobbin 21 and a coil 22 which surrounds a perimeter of the bobbin 21. COPYRIGHT: (C)2009,JPO&INPIT
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