Patent ID: 9708811
Date: 2017-07-18
CPC Classifications: E04B,G10K

Claim:
1. An acoustic board having displaced and passably abutted multiple through-holes, wherein the acoustic board has an outer surface and an inner surface opposite to the outer surface, characterized in that the acoustic board comprises: a plurality of first through-holes formed from the outer surface toward the inner surface; and a plurality of second through-holes formed from the inner surface toward the outer surface; and in which at least some of the second through-holes have a cross-sectional area of greater than 1 mm each first through-hole has a first conical shape with a first opening and a second opening, the first opening has a diameter greater than a diameter greater of the second opening, the first opening abutting the outer surface, each second through-hole has a second conical shape with a third opening and a fourth opening, the third opening has a diameter greater than a diameter greater of the fourth opening, the third opening abutting the inner surface, and the second opening of a first through-hole abuts partially the fourth opening of a second through-hole and results in a resulting through-hole with a diameter smaller than the diameter of the second opening and the diameter of the fourth opening.