Patent ID: 8157052
Filing Date: 2012-04-17
Classification: G10K

Abstract:
1. An acoustic structure comprising a hollow member, said hollow member adapted to be disposed close to a reflective surface which faces to an external space, said hollow member comprising: a hollow region formed in the hollow member; and an opening portion communicating the hollow member with the external space, wherein the hollow member is disposed close to the reflective surface in such a manner that the opening portion of the hollow member is disposed adjacent to the reflective surface, wherein incident sound waves fall in the opening portion and fall on the reflective surface from the external space, wherein a space portion of the hollow region adjoining and communicating with said opening portion is constructed as an intermediate layer, and a portion of said hollow region extending from one end of the hollow region to the intermediate layer is constructed as a resonator, and wherein the hollow member is configured such that a ratio of an area of the opening portion to an area of a boundary surface between the resonator and the intermediate layer decreases.