| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve the problem that, in an acoustic playback system for transducing electric energy to acoustic energy, enhancement in driving power per unit power reaches the limit. Ž<P>SOLUTION: A number of couples of voice coils causing currents required for generating driving power to flow and magnetic gaps for securing a magnetic flux density are provided concentrically or in an array shape. Therefore, driving power to be obtained per unit power can be enhanced without limit within the range of technologies employed for speaker production as of 2009. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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