Title:
SOUND ABSORBING STRUCTURE AND SOUND ABSORBING BOARD
Document Type and Number:
Japanese Patent JP3932156
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide high sound absorbing performance over a broad frequency region.
SOLUTION: The sound absorbing structure consists of porous metallic materials 1 of the foremost row on a front surface side, porous metallic materials 2 of a rear row internally arranged apart intermediate air layers 4 and further sound shielding materials 3 arranged behind the same apart rear air layers 5. These porous metallic materials 1 and 2 are all of an aluminum system and the surface density thereof is about 0.3 to 5.0 kg/m2 in order to obtain a preferably sound absorbing characteristic. The surface density of the porous metallic materials 2 of the rear row is made larger than that of the porous metallic materials 1 of the foremost row.
Inventors:
Yoshihiro Ota
Suzuki Yasunobu
Suzuki Yasunobu
Application Number:
JP17854499A
Publication Date:
June 20, 2007
Filing Date:
June 24, 1999
Export Citation:
Assignee:
Nippon Insulator Co., Ltd.
International Classes:
E01F8/00; G10K11/16; E01F8/02; E04B1/86; (IPC1-7): G10K11/16; E01F8/00; E01F8/02; E04B1/86
Domestic Patent References:
| JP10168833A | ||||
| JP4333897A | ||||
| JP9204188A | ||||
| JP8190384A | ||||
| JP10331286A |
Attorney, Agent or Firm:
Tatsuo Watanuki
Fumio Yamamoto
Fumio Yamamoto
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