Soundproofing plate which does not obstruct airflow

Abstract

A soundproofing plate includes a substrate wherein through holes are formed; and sound collecting parts, including through holes in the center, which approximately match the through holes of the substrate, the collecting parts having a shape wherein the diameter increases as the distance from the substrate increases. The sound collecting parts are disposed on both faces of the substrate. Alternatively, a soundproofing plate includes a substrate with a plurality of through holes; and attenuation elements. The attenuation elements include hollow shaft members; and sound collecting parts anchored on the end parts of the hollow shaft members. The sound collecting parts include through holes in the centers which approximately match hollow parts in the hollow shaft members; and have a shape wherein the diameter increases as the distance from the hollow shaft member increases. The hollow shaft members are disposed in the substrate to approximately match the substrate through holes.

Dependencies are inferred from the claim text.