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    • 13. 发明专利
    • Sound absorber
    • JP5056385B2
    • 2012-10-24
    • JP2007314769
    • 2007-12-05
    • ヤマハ株式会社
    • 哲 小林
    • G10K11/16E04B1/86
    • PROBLEM TO BE SOLVED: To prevent the film vibration of a film-shaped sound-absorbing material from being disturbed by a resonance hole for Helmholtz resonance formed in the film-shaped sound-absorbing material in a sound absorbing body for collectively exhibiting sound absorbing action by film vibration and sound absorbing action by the Helmholtz resonance. SOLUTION: An aperture section 18a of a cavity 18 is closed with a film-shaped sound-absorbing material 20. The film-shaped sound-absorbing materials 18a are stacked by sticking a stripe 28 to a corner section of the film-shaped sound-absorbing material 18a. The resonance hole 30 is formed by penetrating through this stacked section. The resonance hole 30 is connected through the cavity 18. A forming position of the resonance hole 30 is within 20% of dimensions L1 and L2 of a face of the film-shaped sound-absorbing material 20, from fixed ends 32 and 34 of a peripheral section of the film-shaped sound-absorbing material 20. A Helmholtz resonance frequency is adjusted by a film thickness of the stripe 28 or a cross section of the resonance hole 30. COPYRIGHT: (C)2009,JPO&INPIT