To provide a novel sound absorber capable of developing superior sound absorption characteristics in a low frequency band even if thin.SOLUTION: A sound absorber comprises a porous layer which includes non-woven fabric including thermoplastic fiber, and a multi-holed layer which includes a molten and hardened body of non-woven fabric on the porous layer, and the multi-holed layer comprise a base part having a plurality of holes and a hollow neck part extending from at least some of holes into the porous layer, wherein when the porous layer side is arranged facing an object member, a Helmholtz resonance box structure is formed which resonates to a sound entering the holes.SELECTED DRAWING: Figure 1
【課題】薄厚であっても低い周波数帯域において優れた吸音特性を発現することができる、新たな吸音材を提供すること。【解決手段】熱可塑性繊維を含む不織布を含む多孔質層と、多孔質層上に不織布の溶融硬化物を含む多孔層と、を備え、多孔層が、複数の孔を有する基部と、少なくとも一部の孔から多孔質層内に延在する中空状のネック部とを備え、多孔質層側を対象部材に向けて配置した時に、孔から入射する音に共鳴するヘルムホルツ共鳴箱構造が形成される、吸音材。【選択図】図1
SOUND ABSORBER AND VEHICLE MEMBER
吸音材及び車両部材
2024-04-24
Patent
Electronic Resource
Japanese
SOUND ABSORBER ARRANGEMENT STRUCTURE IN VEHICLE INTERNAL MEMBER
European Patent Office | 2019
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