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Title:
SOUND-ABSORBING MATERIAL AND VEHICLE MEMBER
Document Type and Number:
WIPO Patent Application WO/2023/189959
Kind Code:
A1
Abstract:
Provided is a sound-absorbing material provided with a multi-hole layer comprising a non-breathable material, and a porous layer comprising a breathable material, wherein the multi-hole layer is provided with a base portion having a plurality of holes, and hollow neck portions extending from at least some of the holes into the porous layer, and when the sound-absorbing material is disposed with the porous layer side facing an object member, two or more types of Helmholtz resonance box structures having different resonance frequencies, which are resonant with sounds incident from the holes, are formed.

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Inventors:
UNNO MITSUO (JP)
EDAMOTO DAIKI (JP)
SHIMOTANI KEISO (JP)
Application Number:
PCT/JP2023/011290
Publication Date:
October 05, 2023
Filing Date:
March 22, 2023
Export Citation:
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Assignee:
RESONAC CORP (JP)
International Classes:
B60R13/08; G10K11/172; G10K11/16; G10K11/168
Foreign References:
JP2012123293A2012-06-28
JP2018101001A2018-06-28
JP2011180381A2011-09-15
JP2018141839A2018-09-13
JP2020122917A2020-08-13
JP2012255967A2012-12-27
Attorney, Agent or Firm:
HASEGAWA Yoshiki et al. (JP)
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