Patent ID: 8714304

Claim:
A soundproofing plate comprising: a substrate having at least one through hole formed therein; and a soundproofing device mounted on the through hole of the substrate; the soundproofing device having a multiplex structure having at least a first structure and a second structure nested therein; the first structure comprising a first air passage hole disposed in the center and communicating with the through hole of the substrate, and a first sound collecting portion disposed at both ends or one end and having a larger size than the aperture area of the first air passage hole, and being arranged so as to reflect incident noise; and the second structure nested in the first structure, comprising a second air passage hole disposed in the center and communicating with the through hole of the substrate, and a second sound collecting portion disposed at both ends or one end and having a larger size than the aperture area of the second air passage hole, and being arranged so as to reflect incident noise.