| 摘要 |
PROBLEM TO BE SOLVED: To provide a circuit board with a simple structure capable of reducing unpleasant sound by adjusting the natural frequency of a coil element. SOLUTION: A weight 8 is integrally provided on the coil element 7 for varying the natural frequency of the coil element 7 in the circuit board on which a circuit element is mounted including the coil element 7 formed by winding a wire on a core 72 comprising a magnetic body. Since the provision of the weight 8 permits adjustment of the natural frequency of the coil element 7 in this way, the resonance of the coil element 7 can be suppressed and production of the unpleasant sound can be reduced. Further, since the resonance suppression is attained by having only to provide the weight 8 to the coil element 7, the configuration can be made simple. COPYRIGHT: (C)2006,JPO&NCIPI
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