CPC G10K 11/172 (2013.01) | 18 Claims |
1. A sound absorber comprising a plurality of cavities mutually different in at least one of shape and size, wherein
a wall of a first cavity included in the plurality of cavities includes a first region and a second region, wherein a plurality of through-holes connecting an interior of the first cavity to an exterior of the first cavity is formed in the first region, and wherein no through-holes connecting the interior of the first cavity and the exterior of the first cavity is formed in the second region adjacent to the first region,
a wall of a second cavity included in the plurality of cavities includes a third region and a fourth region, wherein a plurality of through-holes connecting an interior of the second cavity to an exterior of the second cavity is formed in the third region, and wherein no through-holes connecting the interior of the second cavity and the exterior of the second cavity is formed in the fourth region adjacent to the third region, and
size of through-holes in the first region is different from size of through-holes in the third region.
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