Grille and acoustic device
A grille and an acoustic device having a superior exterior design without impairment of acoustic efficiency are provided. The grille includes: a through hole-provided region having a plurality of through holes; and a non-through hole-provided region having a plurality of non-through holes each with a bottom, and provided adjacent to the through hole-provided region. The through holes and the non-through holes entirely provide a plurality of openings on an exterior surface of the grille. In the non-through hole-provided region, a depth of the non-through holes on a side close to the through hole-provided region is greater than a depth of the non-through holes on a side distant from the through hole-provided region.
1. A grille comprising:
a plurality of through hole-provided regions each having a plurality of through holes; and
a non-through hole-provided region having a plurality of non-through holes each with a bottom, and provided adjacent to and surrounding each of the plurality of through hole-provided regions, wherein
the through holes and the non-through holes entirely provide a plurality of openings on an exterior surface of the grille, and
in the non-through hole-provided region, a depth of the non-through holes disposed close to the plurality of through hole-provided regions is greater than a depth of the non-through holes disposed distant from the plurality of through hole-provided regions.
2. The grille according to claim 1 , wherein in the non-through hole-provided region, a plurality of rows of the non-through holes are formed from a side adjacent to at least one through hole-provided region of the plurality of through hole-provided regions toward a side distant from the at least one through hole-provided region.
3. The grille according to claim 2 , wherein the rows are formed in such a manner that the depth of the non-through holes gradually decreases from the side adjacent to the at least one through hole-provided region toward the side distant from the at least one through hole-provided region.
4. The grille according to claim 1 , wherein the bottoms of the non-through holes have irregular-reflection surfaces.
5. The grille according to claim 4 , wherein the irregular-reflection surfaces include embossed surfaces, small R-surfaces, or cone-shaped surfaces.
6. The grille according to claim 1 , wherein an exterior design region is provided adjacent to the non-through hole-provided region on the exterior surface.
7. The grille according to claim 6 , wherein the exterior design region surrounds the non-through hole-provided region.
8. The grille according to claim 6 , wherein, in the exterior design region, a plurality of non-through holes are provided which have the same depth as that of the non-through holes in the non-through hole-provided region on a side close to the exterior design region.
9. The grille according to claim 1 , wherein
in the non-through hole-provided region, a plurality of rows of the non-through holes are formed from a side adjacent to at least one through hole-provided region of the plurality of through hole-provided regions toward a side distant from the at least one through hole-provided region,
the rows are formed in such a manner that the depth of the non-through holes gradually decreases from the side adjacent to the at least one through hole-provided region toward the side distant from the at least one through hole-provided region, and
the grille is provided in such a manner that the thickness of the grille from the bottoms of the non-through holes gradually increases from the side adjacent to the at least one through hole-provided region toward the side distant from the at least one through hole-provided region.