초록 ▼

An acoustic board having displaced and passably abutted multiple through-holes comprises an outer surface and an inner surface, in which the first through-holes formed from the outer surface toward the inner surface and the second through-holes formed from the inner surface toward the outer surface

An acoustic board having displaced and passably abutted multiple through-holes comprises an outer surface and an inner surface, in which the first through-holes formed from the outer surface toward the inner surface and the second through-holes formed from the inner surface toward the outer surface are displaced and passably abutted thereby conjunctively constituting acoustically absorptive micro-orifices. Herein at least some of the second through-holes have a cross-sectional area of greater than 1 mm2 and are displaced and passably abutted to at least some of the first through-holes, thereby collectively forming a plurality of acoustically absorptive micro-orifices having a cross-sectional area of smaller than 1 mm2, and, in comparison with the total area of the acoustic board, the opening rate for the sum of the cross-sectional areas of all such acoustically absorptive micro-orifices is less than 3%.

대표청구항 ▼

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

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; anda plurality of second through-holes formed from the inner surface toward the outer surface; andin which at least some of the second through-holes have a cross-sectional area of greater than 1 mm2 and are displaced and passably abutted to at least some of the first through-holes, thereby conjunctively forming a plurality of acoustically absorptive micro-orifices having a cross-sectional area of smaller than 1 mm2, and, in comparison with the total area of the acoustic board, the opening rate for the sum of the cross-sectional areas of all such acoustically absorptive micro-orifices is less than 3%,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, andthe 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. 2. The acoustic board having displaced and passably abutted multiple through-holes according to claim 1, characterized in that the acoustic board comprises a surface plate material and an auxiliary plate material, in which the surface plate material has the outer surface and the first through-holes, the auxiliary plate material has the inner surface and the second through-holes, and the surface plate material and the auxiliary plate material are mutually abutted for combination. 3. The acoustic board having displaced and passably abutted multiple through-holes according to claim 2, characterized in that the acoustic board further comprises at least a correspondence plate material, in which the correspondence plate materials respectively have a plurality of third through-holes and at least one of such correspondence plate materials is abutted and combined to the inner surface of the auxiliary plate material such that at least some of the third through-holes are displaced and passably abutted to the acoustically absorptive micro-orifices. 4. The acoustic board having displaced and passably abutted multiple through-holes according to claim 1, characterized in that the acoustic board further comprises an assembly part thereby enabling the mutual abutment and overlap of the surface plate material and the auxiliary plate material for assemblage. 5. The acoustic board having displaced and passably abutted multiple through-holes according to claim 4, characterized in that the assembly part further includes a plurality of slide grooves formed on the surface plate material and the auxiliary plate material, and a plurality of fixation bolts allowing penetration through the slide grooves, thereby enabling relative slide when the surface plate material is overlapped in combination to the first auxiliary plate material closely abutted to the surface plate material. 6. The acoustic board having displaced and passably abutted multiple through-holes according to claim 1, characterized in that the acoustic board comprises an injection-molded body, and the body is integrally formed with the first through-holes and the second through-holes. 7. The acoustic board having displaced and passably abutted multiple through-holes according to claim 1, characterized in that the first through-holes and the second through-holes have the same shape. 8. The acoustic board having displaced and passably abutted multiple through-holes according to claim 1, characterized in that the first through-holes and the second through-holes have different shape. 9. The acoustic board having displaced and passably abutted multiple through-holes according to claim 1, characterized in that the opening rate is less than 1%. 10. The acoustic board having displaced and passably abutted multiple through-holes according to claim 1, characterized in that the cross-sectional area of the acoustically absorptive micro-orifices is less than 0.04 mm2.