| 摘要 |
PROBLEM TO BE SOLVED: To provide a voice coil for a speaker, which efficiently increases effective electromagnetic force thereof. SOLUTION: In a voice coil 5b used for a repulsive magnetic circuit with a yoke, a winding density of a lower coil that serves as a yoke bottom surface side, is set to be higher than that of an upper coil. COPYRIGHT: (C)2011,JPO&INPIT
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