| 摘要 |
PROBLEM TO BE SOLVED: To provide a sound absorption structure for effectively making use of a closed-celled porous material as a sound absorption material which has elasticity, which does not have permeability, and which is originally low in sound absorption property. SOLUTION: A in the figure indicates the property by an open-celled vibrator, and B in the figure indicates the property by a closed-celled vibrator. The open-celled porous material A indicates a property that a sound absorption rate increases when a tone-range becomes higher and that it decreases when the tone-range becomes lower. On the other hand, the frequency of the closed-celled porous material B, which becomes a peak of sound absorption, is at a relatively low frequency, and it turns out that the sound absorption rate of the closed-celled porous material B is high. That is to say, even a sound absorption structure 10 formed of the vibrator 30 of the closed-celled porous material exerts a sound absorption action. COPYRIGHT: (C)2010,JPO&INPIT
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