sound-absorbing structure

Abstract

To provide a sound absorption board whose sound absorption characteristics can be adjusted during construction or even after installation.SOLUTION: A sound-absorbing board 11 of the present invention has a plate-like base material 20 made of a material having expandable and contractible characteristic. The plate base material 20 has a plurality of through holes 22. Each of the plurality of through holes 22 is open on the plate surfaces 25 and 26 of the plate base material 20 and penetrates through the plate base material 20 along the Z direction. The opening shape of each of the plurality of through holes 22 and the distance between centers 22C of two through holes 22 adjacent to each other on the plate surfaces 25 and 26 of the plurality of through holes 22 are determined according to a frequency band of sound wave to be absorbed.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention , suck Regarding sound structure. [Background technology]

[0002] Perforated panels (also called perforated boards, or acoustic panels) are one type of sound-absorbing structure used in concert halls and indoor music rooms to adjust reverberation and soundproof. Effective panels exhibit excellent sound absorption coefficients in specific frequency bands. These sound-absorbing characteristics are determined by factors such as the diameter of the holes formed in the perforated panel, the thickness of the perforated panel, and the open area ratio of the effective panel.

[0003] For example, Patent Document 1 discloses a sound-absorbing panel in which a corrugated sheet and a flat sheet are superimposed on each other. The sound-absorbing panel disclosed in Patent Document 1 has a first opening formed therein that communicates with a first cavity formed between the flat sheet and the valley portion of the corrugated sheet. In addition, the sound-absorbing panel disclosed in Patent Document 1 has a second opening formed at each crest portion of the corrugated sheet where the flat sheet and the corrugated sheet abut against each other, which penetrates the flat sheet and the corrugated sheet and communicates with a second cavity formed between the crest portion of the corrugated sheet and the existing interior surface. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-030431 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the plate members of conventional perforated panels, including the sound-absorbing panels described above, are made of materials with low extensibility, such as wood or gypsum, and the plate members are transported and installed at the installation site with multiple holes pre-formed in them, making it difficult to adjust the sound absorption characteristics of the perforated panel during construction or after installation.

[0006] This invention allows adjustment of sound absorption characteristics during construction or after installation Absorbed Provides sound structure. [Means for solving the problem]

[0007] The sound-absorbing board of the present invention comprises a plate-like base material made of an elastic material, and a plurality of through holes are formed in the plate-like base material, each of the plurality of through holes opening on the plate surface of the plate-like base material and penetrating the plate-like base material along the thickness direction, and the opening shape of each of the plurality of through holes and the distance between the centers of two of the plurality of through holes adjacent to each other on the plate surface are determined according to the frequency band of the sound waves to be absorbed.

[0008] In the above-described sound-absorbing board, the opening shape of each of the plurality of through holes and the distance between the centers of the through holes change as the tension applied to the elastic plate-like substrate changes, thereby changing the frequency band in which the sound absorption coefficient is high. That is, in the above-described sound-absorbing board, the tension applied to the plate-like substrate can be changed, which changes the opening shape of each of the plurality of through holes and the distance between the centers of the through holes, making it possible to adjust the frequency band in which the sound absorption coefficient is high. Therefore, with the above-described sound-absorbing board, the sound absorption characteristics can be adjusted by changing the tension applied to the plate-like substrate during construction or even after installation.

[0009] The above-mentioned sound-absorbing board may include a tension adjustment mechanism having a connection part connected to the outer peripheral end of the plate-shaped base material and configured to be movable in a direction along the plate surface, and the tension adjustment mechanism may move the connection part outward from the plate surface to widen the through hole and increase the distance, and may move the connection part toward the center of the plate surface to narrow the through hole and shorten the distance.

[0010] According to the sound-absorbing board described above, the tension adjustment mechanism grips the outer peripheral edge of the plate-shaped base material and changes the tension of the plate-shaped base material, thereby precisely adjusting the opening shape of each of the multiple through holes and the distance between the centers of the through holes, thereby enabling the frequency band with a high sound absorption coefficient to be adjusted with high precision compared to when no tension adjustment mechanism is provided.

[0011] The sound-absorbing structure of the present invention is configured such that a plurality of the above-mentioned sound-absorbing plates are stacked in the thickness direction, the tension of the plate-like base material is adjusted by the tension adjustment mechanism of each sound-absorbing plate, and the frequency band of the sound waves to be absorbed can be adjusted according to the relative arrangement of the plurality of through holes when viewed along the thickness direction.

[0012] According to the above-described sound-absorbing structure, sound-absorbing panels having elastic plate-like substrates are stacked in the thickness direction, and multiple through holes are formed in each plate-like substrate. Therefore, the relative arrangement of the multiple through holes among the multiple sound-absorbing panels when viewed along the thickness direction can be changed by changing the tension of the plate-like substrate of each sound-absorbing panel. Changing the relative arrangement of the multiple through holes changes the shape of the opening areas of the overlapping through holes along the panel surface and the spacing between the approximate centers of the opening areas, thereby changing the frequency band with a high sound absorption coefficient. That is, according to the above-described sound-absorbing structure, by controlling the tension of each plate-like substrate of the multiple sound-absorbing panels stacked in the thickness direction, the shape of the opening areas of the overlapping through holes along the panel surface and the spacing between the approximate centers of the opening areas can be adjusted, thereby adjusting the frequency band of the sound waves to be absorbed. Therefore, according to the above-described sound-absorbing structure, the sound absorption characteristics can be adjusted by changing the tension applied to each plate-like substrate of the multiple sound-absorbing panels stacked in the thickness direction, even during construction or after installation. [Effects of the Invention]

[0013] According to the present invention, sound absorption characteristics can be adjusted during construction or even after installation. Absorbed It is possible to provide a sound structure. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a front view of a sound-absorbing panel according to an embodiment of the present invention; [Figure 2] 2 is a cross-sectional view of the sound-absorbing board taken along the line A1-A1 shown in FIG. 1. [Figure 3]2 is a front view illustrating a method for adjusting the sound absorption characteristics by changing the tension of the plate-shaped substrate of the sound-absorbing board shown in FIG. 1. FIG. [Figure 4] 1 is a front view of a sound absorbing structure according to an embodiment of the present invention; [Figure 5] 5 is a cross-sectional view of the sound absorbing structure taken along the line A2-A2 in FIG. 4. [Figure 6] 5 is a front view illustrating a method for adjusting sound absorption characteristics by changing the tension of the plate-shaped substrate of each sound absorbing plate of the sound absorbing structure shown in FIG. 4. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0015] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A sound-absorbing panel and a sound-absorbing structure according to an embodiment of the present invention will now be described with reference to the drawings.

[0016] <Sound-absorbing board> The sound-absorbing panel 11 of this embodiment is installed on, for example, a wall surface or a partition surface in a room where acoustic adjustment, soundproofing, or sound deadening measures are required. As shown in FIGS. 1 and 2 , the sound-absorbing panel 11 includes a plate-shaped substrate 20 made of a stretchable material and a tension adjustment mechanism 40. The material of the plate-shaped substrate 20 may be, for example, synthetic rubber or thick cloth, but is not particularly limited as long as it is stretchable and has shape retention in its natural state (i.e., when no external force is applied). The plate-shaped substrate 20 has a predetermined thickness. The thickness of the plate-shaped substrate 20 depends on the center frequency or peak frequency of the sound to be absorbed and the deformability of the plate-shaped substrate 20. The thicker the plate-shaped substrate 20, the lower the center frequency or peak frequency of the sound to be absorbed. In other words, if the deformability of the plate-shaped substrate 20 is constant, the lower the center frequency or peak frequency of the sound to be absorbed, the greater the suitable thickness of the plate-shaped substrate 20.

[0017] Hereinafter, a first direction (horizontal direction in FIG. 1) along the plate surfaces 25, 26 of the plate-shaped substrate 20 is referred to as the X direction, and one side along the X direction from a predetermined position is referred to as the +X side or +X direction, and the other side along the X direction is referred to as the -X side or -X direction. Similarly, a second direction (vertical direction in FIG. 1) along the plate surfaces 25, 26 of the plate-shaped substrate 20 that is perpendicular to the first direction is referred to as the Y direction, and one side along the Y direction from a predetermined position is referred to as the +Y side or +Y direction, and the other side along the Y direction is referred to as the -Y side or -Y direction. Furthermore, a third direction (direction perpendicular to the plane of the paper in FIG. 1) along the thickness direction of the plate-shaped substrate 20 is referred to as the Z direction, and one side along the Z direction from a predetermined position is referred to as the +Z side or +Z direction, and the other side along the Z direction is referred to as the -Z side or -Z direction.

[0018] A plurality of through holes 22 are formed in the plate-shaped substrate 20. Each of the through holes 22 opens to plate surfaces 25 and 26 of the plate-shaped substrate 20 and penetrates the plate-shaped substrate 20 along the Z direction. The opening shape of the through holes 22 is, for example, circular. Note that the opening shape of the through holes 22 may be appropriately changed to a rectangle, star shape, or the like as necessary. In this embodiment, the plurality of through holes 22 are formed with openings of the same perfect circle and size, and are formed at equal intervals in the X and Y directions. The opening shape of each of the plurality of through holes 22, the size 22x in the X direction, the size 22y in the Y direction, and the distance 23x in the X direction and the distance 23y in the Y direction between centers 22C of two adjacent through holes 22 on the plate surface 25 (or plate surface 26) of the plurality of through holes 22 correspond to the frequency band of sound waves (not shown) to be absorbed by the sound-absorbing panel 11.

[0019] The tension adjustment mechanism 40 has a connecting portion 41 and a connecting portion 42 connected to the -X side end 28-1 and the +X side end 28-2 of the outer peripheral end 28 of the plate-shaped substrate 20. The Y-direction size of the connecting portions 41 and 42 is larger than at least the Y-direction area of ​​the plate-shaped substrate 20 in which the multiple through holes 22 are formed. As a result, when the connecting portions 41 and 42 are moved in the X-direction, as described below, the tension of the plate-shaped substrate 20 changes approximately uniformly in the Y-direction, and the opening shapes of the through holes 22 and the distance between the centers 22C of the through holes 22 change approximately uniformly in the Y-direction. In other words, moving the connecting portions 41 and 42 in the X-direction makes it easier to achieve the desired change in sound absorption characteristics. The connecting portions 41 and 42 are configured to be movable at least in the X-direction (the direction along the plate surface). The tension adjustment mechanism 40 further includes a drive unit for the connection parts 41 and 42, but in the drawings from FIG. 1 onwards, illustration of the configuration of the tension adjustment mechanism 40 other than the connection parts 41 and 42 is omitted.

[0020] As shown in FIG. 3, when the tension adjustment mechanism 40 is activated and the connecting portion 41 moves toward the −X side from the relative position shown in FIG. 1, and the connecting portion 42 moves toward the +X side from the relative position shown in FIG. 1, the plate-shaped substrate 20 stretches in the X direction. As the plate-shaped substrate 20 stretches in the X direction, the opening shape of the through hole 22 deforms from a perfect circle to an ellipse whose major axis is parallel to the X direction. The size 22x of the through hole 22 in the X direction increases to a size 22x′. The distance 23x between the centers 22C of adjacent through holes 22 in the X direction increases to a distance 23x′. Meanwhile, as the plate-shaped substrate 20 stretches in the X direction, the plate-shaped substrate 20 shrinks slightly in the Y direction, and the size 22y of the through hole 22 in the Y direction decreases slightly to a size 22y′. The distance 23y between the centers 22C of adjacent through holes 22 in the Y direction increases to a distance 23y′.

[0021] As described above, increasing or decreasing the respective sizes and distances changes the frequency band in which the sound absorbing board 11 has a higher sound absorption coefficient than other frequency bands, i.e., the sound absorption characteristics. In other words, in order to change the frequency band before the change in which the sound absorbing board 11 has a high sound absorption coefficient when the plate-shaped base material 20 is in its natural state to the changed frequency band, the connecting parts 41, 42 can be moved so that the size 22x' in the X direction and the size 22y' in the Y direction of the through holes 22 and the distance 23x' in the X direction and the distance 23y' in the Y direction between the centers 22C of adjacent through holes 22 match the changed frequency band.

[0022] The sound-absorbing board 11 of this embodiment described above includes a plate-shaped base material 20 made of an elastic material. A plurality of through holes 22 are formed in the plate-shaped base material 20. Each of the plurality of through holes 22 opens on plate surfaces 25, 26 of the plate-shaped base material 20 and passes through the plate-shaped base material 20 along the Z direction. The opening shape of each of the plurality of through holes 22 and the distance between centers 22C of two of the plurality of through holes 22 that are adjacent to each other on the plate surfaces 25, 26 are determined according to the frequency band of sound waves to be absorbed.

[0023] In the sound-absorbing board 11 of this embodiment, the opening shape, opening size 22x, 22y, and distance 23x, 23y between centers 22C of the through holes 22 change as the tension applied to the stretchable plate-like substrate 20 changes, thereby changing the frequency band with a high sound absorption coefficient. That is, in the sound-absorbing board 11 of this embodiment, the plate-like substrate 20 is stretchable, so the tension applied to the plate-like substrate 20 can be changed. This allows the opening shape, opening size 22x, 22y, and distance 23x, 23y between centers 22C of the through holes 22 to be changed, thereby adjusting the frequency band with a high sound absorption coefficient. Therefore, according to the sound-absorbing board 11 of this embodiment, the sound absorption characteristics can be adjusted by changing the tension applied to the plate-like substrate 20 during construction or even after installation.

[0024] The sound-absorbing panel 11 of this embodiment includes a tension adjustment mechanism 40 having connection portions 41 and 42 connected to the ends 28-1 and 28-2 of the plate-shaped substrate 20 and configured to be movable in the X direction along the plate surfaces 25 and 26. The tension adjustment mechanism 40 can widen the through holes 22 in the X direction and lengthen the distance 23x between the centers 22C to 23x' by moving the connection portions 41 in the -X direction (outward from the plate surface) and the connection portion 42 in the +X direction (outward from the plate surface). Although not shown, the through holes 22 can be narrowed and the distance between the centers 22C in the X direction can be shortened by moving the connection portions 41 and 42 in the opposite direction to that shown in FIG. 3, i.e., by moving the connection portion 41 in the +X direction (toward the center of the plate surface) and the connection portion 42 in the -X direction (toward the center of the plate surface).

[0025] According to the sound-absorbing board 11 of this embodiment, by gripping the outer peripheral edge 28 of the plate-shaped substrate 20, for example, in the X direction, with the tension adjustment mechanism 40 and changing the tension of the plate-shaped substrate 20 without distorting or deforming the plate-shaped substrate 20, it is possible to adjust the opening shape of each of the plurality of through holes 22 and the distance between centers 22C of the through holes 22 with higher precision than when the connecting portions 41, 42 are not used. This makes it possible to adjust the frequency band with a high sound absorption coefficient, i.e., the sound absorption characteristics, with higher precision than when the tension adjustment mechanism 40 is not provided.

[0026] <Sound-absorbing structure> As shown in Figures 4 and 5, in the sound-absorbing structure 12 of this embodiment, a plurality of the above-described sound-absorbing panels 11 are stacked in the Z direction (thickness direction). In this embodiment, two sound-absorbing panels 11-1 and 11-2 are stacked in the Z direction, and the sound-absorbing structure 12 includes the sound-absorbing panels 11-1 and 11-2. Each of the sound-absorbing panels 11-1 and 11-2 has a configuration similar to that of the above-described sound-absorbing panel 11. However, the sound-absorbing panel 11-2 is stacked in the Z direction on the sound-absorbing panel 11-1 while rotated 90° with respect to the sound-absorbing panel 11-1 about the center of the panel surfaces 25 and 26. Therefore, the connection portions 43 and 44 of the tension adjustment mechanism 40 included in the sound-absorbing panel 11-2 are connected to the +Y side end 28-3 and the -Y side end 28-4 of the outer peripheral edge 28 of the plate-like substrate 20. The size of the connecting portions 43, 44 in the X direction is larger than at least the region in the X direction in which the plate-like base material 20 of the sound-absorbing plate 11-2 has the plurality of through holes 22. As a result, when the connecting portions 43, 44 are moved in the Y direction, the change in tension of the plate-like base material 20 becomes approximately uniform in the X direction, and the change in the opening shape of the through holes 22 and the change in the distance between the centers 22C of the through holes 22 occur approximately uniformly in the X direction.

[0027] 6, when tension adjustment mechanism 40 for sound absorbing board 11-1 is activated, connecting portion 41 moves toward the -X side from the relative position shown in FIG. 4, and connecting portion 42 moves toward the +X side from the relative position shown in FIG. 4, plate-shaped substrate 20 of sound absorbing board 11-1 stretches in the X direction, as described above for sound absorbing board 11. As plate-shaped substrate 20 of sound absorbing board 11-1 stretches in the X direction, the opening shape of through hole 22 in sound absorbing board 11-1 deforms from a perfect circle to an ellipse whose major axis is parallel to the X direction. At the same time, tension adjustment mechanism 40 for sound absorbing board 11-2 is activated, and connecting portion 43 moves toward the +Y side from the relative position shown in FIG. 4, and connecting portion 44 moves toward the -Y side from the relative position shown in FIG. 4, and plate-shaped substrate 20 of sound absorbing board 11-2 stretches in the Y direction. As the plate-like base material 20 of the sound absorbing board 11-2 is stretched in the Y direction, the opening shape of the through holes 22 of the sound absorbing board 11-2 changes from a perfect circle to an ellipse whose major axis is parallel to the Y direction. Furthermore, the relative arrangement of the multiple through holes in each of the multiple sound absorbing boards 11-1 and 11-2 when viewed along the Z direction (thickness direction) changes.

[0028] As described above, by increasing or decreasing the size and distance of each of the through holes 22, overlapping regions 30 are formed where the through holes 22 overlap each other in a direction along the plate surfaces 25, 26 of the sound-absorbing panels 11-1, 11-2. The frequency band in which the sound absorption coefficient is high in the sound-absorbing structure 12, i.e., the sound absorption characteristics, are determined by the shape of each of the overlapping regions 30, the distance 31x in the X direction between the centers 30C of the overlapping regions 30, and the distance 31y in the Y direction between the centers 30C of the overlapping regions 30. That is, in order to change the frequency band in which the sound-absorbing structure 12 has a high sound absorption coefficient before the change to a new frequency band after the change, the connecting portions 41, 42, 43, 44 can be moved so that the size 30x in the X direction and the size 30y in the Y direction of each of the overlapping regions 30 and the distance 31x in the X direction and the distance 31y in the Y direction between the centers 30C of adjacent overlapping regions 30 match the new frequency band.

[0029] The sound-absorbing structure 12 of this embodiment described above is configured such that the sound-absorbing plates 11-1 and 11-2 are stacked in the Z direction, the tension of the plate-like base material 20 is adjusted by the connection parts 41, 42, 43, and 44 of the tension adjustment mechanism 40 of the sound-absorbing plates 11-1 and 11-2, and the frequency band of the sound waves to be absorbed, i.e., the sound absorption characteristics, can be adjusted according to the relative arrangement of the multiple through holes 22 when viewed along the Z direction.

[0030] In the sound-absorbing structure 12 of this embodiment, sound-absorbing plates 11-1 and 11-2, each having an elastic plate-like base material 20, are stacked in the Z direction, and a plurality of through holes 22 are formed in each plate-like base material 20. The relative arrangement of the plurality of through holes 22 between the sound-absorbing plates 11-1 and 11-2 when viewed along the Z direction, and the shape and spacing of the effective holes in the sound-absorbing structure 12, are changed by changing the tension of the plate-like base material 20 using the tension adjustment mechanisms 40 of each of the sound-absorbing plates 11-1 and 11-2. Changing the relative arrangement of the plurality of through holes 22 changes the shape of overlapping regions (opening regions) 30 of the through holes 22 that overlap each other in the direction along the plate surfaces 25 and 26, the size 30x in the X direction and the size 30y in the Y direction, and the distance (spacing) 31x in the X direction and the distance (spacing) 31y in the Y direction between centers 30C of the overlapping regions 30, and also changes the frequency band with a high sound absorption coefficient in the sound-absorbing structure 12 of this embodiment. That is, according to the sound absorbing structure 12 of this embodiment, by controlling the tension of each plate-like base material 20 of two sound absorbing plates 11-1 and 11-2 stacked in the Z direction, it is possible to adjust the shape of the overlapping region 30 of the through holes 22 that overlap each other in the direction along the plate surfaces 25 and 26 and the distances 31x and 31y between the centers 30C of the overlapping regions 30, and thereby adjust the frequency band of the sound waves to be absorbed. Therefore, according to the sound absorbing structure 12 of this embodiment, the sound absorption characteristics can be easily adjusted by changing the tension applied to each plate-like base material 20 of the sound absorbing plates 11-1 and 11-2 during construction or even after installation.

[0031] Although the preferred embodiment of the present invention has been described in detail above, the present invention is not limited to the specific embodiment, and can be modified within the scope of the spirit of the present invention as defined in the claims.

[0032] In the sound absorbing structure 12 of the above embodiment, two sound absorbing plates 11-1 and 11-2 are stacked, but three or more sound absorbing plates may be stacked.

[0033] Furthermore, when multiple sound-absorbing panels are stacked in the thickness direction as in the sound-absorbing structure 12 of the above-mentioned embodiment, the size, shape, aperture ratio, and material of the openings of the sound-absorbing panels may differ from one another. [Explanation of symbols]

[0034] 11, 11-1, 11-2...Sound absorbing board 20...Plate-shaped substrate 22...Through hole 40…Tension adjustment mechanism 41, 42, 43, 44...Connections

Claims

[Claim 1] A plate-shaped substrate made of an elastic material is provided, A plurality of through holes are formed in the plate-like substrate, Each of the plurality of through holes opens on a plate surface of the plate-shaped substrate and penetrates the plate-shaped substrate along a thickness direction, an opening shape of each of the plurality of through holes and a distance between centers of two adjacent through holes on the plate surface among the plurality of through holes are determined according to a frequency band of sound waves to be absorbed; a tension adjustment mechanism having a connection part connected to an outer peripheral end of the plate-like substrate and configured to be movable in a direction along the plate surface; the tension adjustment mechanism moves the connection portion toward the outside of the plate surface to widen the through hole and increase the distance, and moves the connection portion toward the center of the plate surface to narrow the through hole and decrease the distance, the connecting portion includes a sound absorbing plate provided along one direction of the plurality of through holes formed in the plate-like base material and provided in a range along the one direction that is larger than a region in which the plurality of through holes are formed, Two sound-absorbing plates are stacked in the thickness direction, When viewed from the thickness direction, the tension adjustment mechanism of the first sound-absorbing plate and the tension adjustment mechanism of the second sound-absorbing plate are arranged at positions perpendicular to each other, The tension of the plate-shaped base material is adjusted by the tension adjustment mechanism of each sound-absorbing plate, and the frequency band of the sound waves to be absorbed can be adjusted according to the relative arrangement of the plurality of through holes when viewed along the thickness direction. Sound-absorbing structure.

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