| (19) |
 |
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(11) |
EP 1 659 044 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
07.06.2006 Bulletin 2006/23 |
| (43) |
Date of publication A2: |
|
24.05.2006 Bulletin 2006/21 |
| (22) |
Date of filing: 21.10.2005 |
|
| (51) |
International Patent Classification (IPC):
|
|
| (84) |
Designated Contracting States: |
|
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE
SI SK TR |
|
Designated Extension States: |
|
AL BA HR MK YU |
| (30) |
Priority: |
27.10.2004 JP 2004311686
|
| (71) |
Applicant: HITACHI, LTD. |
|
Chiyoda-ku
Tokyo 100-8280 (JP) |
|
| (72) |
Inventors: |
|
- Aota, Kinya
Hitachi, Ltd., I.P.G.
Tokyo 100-8220 (JP)
- Watanabe, Makoto
Hitachi, Ltd., I.P.G.
Tokyo 100-8220 (JP)
- Horihata, Katutoshi
Hitachi, Ltd., I.P.G.
Tokyo 100-8220 (JP)
- Mutoh, Daisuke
Hitachi, Ltd., I.P.G.
Tokyo 100-8220 (JP)
- Kinoshita, Shinji
Hitachi, Ltd., I.P.G.
Tokyo 100-8220 (JP)
|
| (74) |
Representative: Paget, Hugh Charles Edward et al |
|
Mewburn Ellis LLP
York House
23 Kingsway
London WC2B 6HP
London WC2B 6HP (GB) |
|
| |
|
| (54) |
Sound insulation members of a railroad vehicle, and production methods of sound insulation
members |
(57) The invention provides sound insulation members having enhanced sound insulating
properties without increasing the thickness of the sound insulation members. The object
is achieved by a sound insulation member having disposed inside a pouch-shaped film
(1) with a resin coating a flat sound absorption material (2) formed of foamed porous
material or fiber material and having its inner space communicated, and filling a
filler gas (3) having a sound impedance that differs from air. According to the present
invention, since the present sound insulation member is filled with gas having sound
impedance that differs from air, the present sound insulation member has superior
sound insulating properties since it reflects sound on the sealed surface and also
absorbs the sound by the sound absorption material disposed therein.