US 12,087,262 B2
Soundproof member
Tatsuro Miki, Tokyo (JP); Kazuhiro Kikuchi, Tokyo (JP); Tetsuya Sasakawa, Tokyo (JP); and Ikuma Fujisawa, Tokyo (JP)
Assigned to NICHIAS CORPORATION, Tokyo (JP)
Appl. No. 17/762,166
Filed by NICHIAS CORPORATION, Tokyo (JP)
PCT Filed Jul. 10, 2020, PCT No. PCT/JP2020/027062
§ 371(c)(1), (2) Date Mar. 21, 2022,
PCT Pub. No. WO2021/065145, PCT Pub. Date Apr. 8, 2021.
Claims priority of application No. 2019-183180 (JP), filed on Oct. 3, 2019.
Prior Publication US 2022/0383845 A1, Dec. 1, 2022
Int. Cl. G10K 11/168 (2006.01); B32B 5/02 (2006.01); B32B 27/12 (2006.01)
CPC G10K 11/168 (2013.01) [B32B 5/02 (2013.01); B32B 27/12 (2013.01); B32B 2250/04 (2013.01); B32B 2274/00 (2013.01); B32B 2307/102 (2013.01); B32B 2307/51 (2013.01); B32B 2307/54 (2013.01); B32B 2307/72 (2013.01); B32B 2307/732 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A soundproof member, comprising:
a first elastic porous body layer;
a first film layer;
a second elastic porous body layer; and
a second film layer,
the layers being arranged in the stated order from a sound source side,
wherein the first elastic porous body layer and the second elastic porous body layer each have:
a thickness of 0.5 mm or more and 10 mm or less;
a bulk density of 25 kg/m3 or more and 2,000 kg/m3 or less;
a Young's modulus of 7,000 Pa or more and 28,000 Pa or less; and
a viscous characteristic length of 15 μm or more and 160 μm or less, and
wherein a total (L1/Λ1+L2/Λ2) of a ratio (L1/Λ1) of the thickness L1 in mm, of the first elastic porous body layer to the viscous characteristic length Λ1, in μm, thereof and a ratio (L2/Λ2) of the thickness L2, in mm, of the second elastic porous body layer to the viscous characteristic length Λ2, in μm, thereof is 0.11 or more.