| 摘要 |
PROBLEM TO BE SOLVED: To provide a light and thin loud speaker different from a prior art loud speaker which is heavy and thick since it uses a magnet. SOLUTION: In a loud speaker, a coil is provided to a tympanum and it is put at the inside or outside of the coil. A coil wound reversely is fixedly provided with a core of ferrite or the like in some cases, and the same voice signal currents are transmitted to both coils. COPYRIGHT: (C)2004,JPO&NCIPI
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