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Patent Searching and Data


Title:
SOUND ABSORBING MATERIAL, COMPONENT FOR VEHICLE, AND AUTOMOBILE
Document Type and Number:
WIPO Patent Application WO/2019/008774
Kind Code:
A1
Abstract:
The present invention pertains to a sound absorbing material having non-through holes, the sound absorbing material being characterized in that the non-through holes of the sound absorbing material have a Helmholtz resonance structure comprising an introduction passage that is open to the outer surface and a hollow part connected to the outside via the introduction passage, wherein when, in the introduction passage, the equivalent circle diameter is d, the length is L, the opening area is S, and the surface roughness is Ra, and the volume of the hollow part is V, the equivalent circle diameter d is 1-30 mm, the length L is 1-20 mm, and the relationship 500 Hz ≤ f ≤ 2000 Hz is established for f (Hz) derived using equation (1). (In equation (1), the speed of sound c is 34,000 cm/s, and α is 1.10 when Ra exceeds 0 μm and is no more than 0.1 μm, α is 1.15 when Ra exceeds 0.1 μm and is no more than 2.0 μm, and α is 1.18 when Ra exceeds 2.0 μm.)

Inventors:
FURUZAWA, Hideki (LTD. Ogaki Kita Plant 1-1, Kitagata, Ibigawacho, Ibi-gu, Gifu 95, 〒5010695, JP)
SAKAGUCHI, Hiroshi (LTD. Ogaki Kita Plant 1-1, Kitagata, Ibigawacho, Ibi-gu, Gifu 95, 〒5010695, JP)
NISHIKAWA, Tomohiro (LTD. Ogaki Kita Plant 1-1, Kitagata, Ibigawacho, Ibi-gu, Gifu 95, 〒5010695, JP)
NOMURA, Toshihiro (LTD. Ogaki Kita Plant 1-1, Kitagata, Ibigawacho, Ibi-gu, Gifu 95, 〒5010695, JP)
Application Number:
JP2017/025055
Publication Date:
January 10, 2019
Filing Date:
July 07, 2017
Export Citation:
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Assignee:
IBIDEN CO., LTD. (1 Kandacho 2-chome, Ogaki-shi Gifu, 04, 〒5038604, JP)
International Classes:
G10K11/172; G10K11/16; G10K11/162
Attorney, Agent or Firm:
YASUTOMI & ASSOCIATES (5-36, Miyahara 3-chome Yodogawa-ku, Osaka-sh, Osaka 03, 〒5320003, JP)
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