JP7776283B2 - Sound absorbers and sound absorber arrangement structures - Google Patents

Description

The present invention relates to a sound absorber and a sound absorber arrangement structure.

Patent Document 1 discloses a known sound-absorbing structure in which unit sound absorbers 2 are adjacent to each other via linear openings in a ceiling or other surface facing a space. However, this requires large-scale construction, and retrofitting parts after construction is difficult.

JP 2018-188954 A

In light of this current situation, the present invention aims to provide a sound absorber and sound absorber arrangement structure that can be easily retrofitted.

In order to achieve the above-mentioned object, a sound absorber according to the present invention is characterized in that it is configured to be attached to a space and is installed on the surface of at least one of a wall, ceiling or floor facing the space, and a structure to be installed within the space (hereinafter referred to as "wall, etc."), or exposed within the space, and has a main body extending in the longitudinal direction, a slit formed along the longitudinal direction of the main body, a cavity communicating with the slit, and end caps that close the longitudinal ends of the cavity, and this internal slit communicates with the space to absorb sound within the space, and the main body comprises a first divided body that forms the cavity, and a second divided body attached to the surface side of the first divided body, and this second divided body has a throat portion that positions the opening of the slit toward the outside of the main body, and this throat portion is positioned outside the first divided body, and the throat portion is formed by the thickness of the surface side portion of the second divided body, and the width of the opening in the direction perpendicular to the longitudinal direction is determined by the attachment position of the second divided body relative to the first divided body.
In the above configuration, the main body may have a pair of cavities on the left and right sides of the slit in a cross section perpendicular to the longitudinal direction, and sound absorbing material may be provided between each of the cavities and the slit.
In order to achieve the above object, a feature of the sound absorber arrangement structure of the present invention is that, in a configuration equipped with any of the sound absorbers described above, the sound absorbers are oriented vertically and arranged horizontally on the wall surface.
In order to achieve the above object, another feature of the sound absorber arrangement structure of the present invention is that, in a configuration including any of the sound absorbers described above, the sound absorbers are oriented vertically and arranged horizontally on a wall surface, with the lower ends of the sound absorbers resting on the floor.
In order to achieve the above object, a further feature of the sound absorber arrangement structure of the present invention is that, in a configuration including any of the sound absorbers described above, the sound absorbers are oriented vertically and arranged horizontally on a wall surface, and the lower ends of the sound absorbers are spaced apart from the floor.
In order to achieve the above object, another feature of the sound absorber arrangement structure of the present invention is that, in a configuration including any of the sound absorbers described above, the sound absorbers are oriented horizontally and aligned vertically and attached to a wall surface.

The features of the sound absorber and sound absorber arrangement structure according to the present invention make it possible to easily retrofit them to spaces, walls, etc.

Other objects, configurations, and advantages of the present invention will become apparent from the detailed description of the invention below.

1 is a perspective view of a sound absorber according to a first embodiment of the present invention. FIG. FIG. 2 is a cross-sectional view taken along the XY plane of FIG. 1 . FIG. 2 is a cross-sectional view taken along the YZ plane of FIG. 1 . FIG. 2 is a cross-sectional view taken along the XZ plane of FIG. 1 . FIG. 3 is a cross-sectional view showing dimensions for explaining the principle in the XY plane similar to FIG. 2 . FIG. 10 is a perspective view showing dimensions for explaining the principle. 1 is a perspective view showing an example of the horizontal position of a sound absorber according to the present invention. FIG. FIG. 6B is a perspective view showing an example of the arrangement of FIG. 6A attached to the ceiling in a vertical position. FIG. 6B is a perspective view showing an example of an arrangement in which the image shown in FIG. 6A is placed on the floor in a vertical position. FIG. 6B is a perspective view showing an example of the arrangement in which the image in FIG. 6A is positioned vertically and midway between the ceiling and the floor. FIG. 10 is an XY cross-sectional view showing a state in which parts are assembled, illustrating a first modified example of the first embodiment. FIG. 10 is an XY cross-sectional view showing a state in which parts are separated from each other, illustrating a first modified example of the first embodiment. FIG. 10 is an XY cross-sectional view showing a state in which parts are separated from each other, illustrating a second modified example of the first embodiment. FIG. 10 is an XY cross-sectional view showing a state in which parts according to a second embodiment are assembled. FIG. 10 is an XY cross-sectional view showing a state in which parts are separated from each other according to a second embodiment. FIG. 3 is a cross-sectional view showing dimensions for explaining the principle in the XY plane similar to FIG. 2 in the second embodiment. FIG. 10 is an XY cross-sectional view showing a state in which parts are assembled, illustrating a first modified example of the second embodiment. FIG. 10 is an XY cross-sectional view showing a state in which parts according to a third embodiment are assembled. FIG. 10 is an XY cross-sectional view showing a state in which parts are separated from each other according to a third embodiment. FIG. 10 is a cross-sectional view showing dimensions for explaining the principle in the XY plane similar to FIG. 2 in the third embodiment. FIG. 13 is an XY cross-sectional view showing a state in which parts are assembled, illustrating a first modified example of the third embodiment. FIG. 13 is an XY cross-sectional view showing a state in which parts are separated from each other, illustrating a first modified example of the third embodiment. FIG. 10 is an XY cross-sectional view showing a state in which parts according to a fourth embodiment are assembled. FIG. 10 is an XY cross-sectional view showing a state in which parts are separated from each other according to the fourth embodiment. FIG. 10 is a cross-sectional view showing dimensions for explaining the principle in the XY plane similar to FIG. 2 in the fourth embodiment. FIG. 13 is an XY cross-sectional view showing a first modified example of the fourth embodiment.

Next, a first embodiment of the present invention will be described, with reference to Figures 1 to 8 of the accompanying drawings as appropriate.

Figure 1 is a perspective view of a sound absorber according to a first embodiment of the present invention. The internal structure is visible to make the cross section easier to understand, but both ends are sealed with end caps 9. A slit-shaped opening 8 is provided along the longitudinal direction of the elongated box-shaped main body 4. A throat 5 extends from the opening 8 into the inside of the main body 4. There is a cavity connected to the back of the throat 5, and a sound absorber 7 is installed next to this. A cavity 3 is provided at the back of the sound absorber, and the shape is elongated.

Next, the protrusions 6 are provided to prevent the sound absorber 7 from falling over or moving out of its correct position.

Figure 2 is a cross-sectional view of Figure 1 taken along the XY plane. The sound absorber 2 has a flat surface with a groove formed on the surface, consisting of an opening 8 and a throat 5. It is attached to the interior wall board 113. It can be attached to the interior wall board 113 using adhesive, double-sided tape, screws, etc. If the wall is metal, it can be attached using common methods such as magnets.

Figure 3 is a cross-sectional view of Figure 1 taken along the YZ plane, and Figure 4 is a cross-sectional view of Figure 1 taken along the XZ plane. The sound absorber 2 is installed with its opening 8 facing the interior of the room. The sound absorber 2 has a cavity at the back of the opening 8, in which the sound absorber 7 is installed. Cavities 3 are provided on both sides of the sound absorber 7.

Figure 5a is a cross-sectional view showing dimensions in the XY plane similar to Figure 2 to explain the principle, and Figure 5b is a perspective view showing dimensions to explain the principle.

In the above, the resonance frequency f0 of the sound absorber is calculated, for example, as shown in the following equation 1.
Formula 1
f0={c/(2π)}×[(a×b)/{V1(l+Kb)}] ^1/2
In the above equations, the variables are as follows (see FIGS. 5(a) and 5(b)):
Formula 2
K=1/π+2/π×loge(2a/b)
Formula 3
V1=A×B×L-a×b×l
V1: cavity volume, A: cavity length, B: cavity width, L: cavity height, a: opening length, b: opening width, l: throat

In Figures 5(a) and (b), L, l, etc. are opening dimensions, and the figures show the relationship between the main body 4 and throat 5 of the sound absorber 2. Each dimension is an internal measurement because it relates to volume. According to this relationship, the cavity width B and cavity height L are determined by the size of the main body 4. Furthermore, the opening length a and cavity length A are determined by the installation environment. Therefore, because the throat l and/or opening width b can be changed, the resonance frequency can be adjusted to a desired value depending on the installation environment of the facility, the fixed size of the sound absorber main body, and as needed.

Figure 6 shows examples of sound absorber placement according to the present invention, with (a) in a horizontal position, (b) in a vertical position when attached to the ceiling, (c) in a vertical position when attached to the floor, and (d) in a vertical position when placed halfway between the ceiling and the floor. The (a) configuration allows for efficient installation at the desired location for sound absorption, such as where a person's head is when sitting. The (b) configuration, by attaching the sound absorber to the ceiling, eliminates unnecessary protrusions at the feet of the wall, reducing the risk of foot injury. The (c) configuration allows for more stable installation, as the main body 4 is installed on the floor and the weight of the sound absorber 2 is supported by the floor. The (d) configuration covers the ears of people in a room, from when they are seated in a chair to when they are standing, allowing for efficient installation at the desired location for sound absorption.

Figure 7a is an XY cross-sectional view showing the assembled parts of the first modified example of the first embodiment, and Figure 7b is an XY cross-sectional view showing the separated parts of the first modified example of the first embodiment.

The sound absorption frequency of the main body 4 can be set by the length l of the throat 5 and the width b of the opening 8 shown in Fig. 5a. To achieve this, the second divided body 12 is installed relative to the first divided body so that the length l of the throat 5 and the width b of the opening 8 are appropriately designed.
Furthermore, because the throat 5 of the second divided body 12 is bent inward of the first divided body 11, the sound absorber 2 has a slit at the opening 8 and a flat surface, and although the sound absorber 2 protrudes when installed inside a room, it can be said that this shape does not cause any problems when installed inside a room.

As shown in Figure 7b, the sound absorption characteristics can be changed by changing the installation position of the second segment 12 while keeping the first segment 11 the same shape, and by changing the position and size of the second segment 12. Changing the characteristics of the sound absorber 2 by changing only the second segment 12 while keeping the first segment 11 the same shape has advantages both in terms of providing customers with a product that meets their performance requirements, and in terms of product manufacturing.

Figure 8 is an XY cross-sectional view showing the parts of a second modified example of the first embodiment separated. By shaping the second divided body 13 as shown in Figure 8, the size of the throat 5 and opening 8 is automatically determined, which is advantageous in terms of manufacturing. In addition, by having the second divided body 13 cover the sides, there is the advantage that the surface and sides can be made to have the same design. Furthermore, by covering the sides as well as the surface of the sound absorber 2 with surface decoration such as paint, a sense of unity can be created for the product. There is no need to worry too much about the bottom surface, as it is in close contact with the wall.

The following are the second and subsequent embodiments. Similar components and structures to those in the first embodiment are designated by the same reference numerals. Figure 9a is an XY cross-sectional view showing the assembled parts of the second embodiment, and Figure 9b is an XY cross-sectional view showing the separated parts of the second embodiment. The throat 5 and opening 8 are positioned facing outward from the main body 4. This allows the provision of a concealing material 23. The concealing material 23 serves to prevent objects or fingers from being inserted into the gap in the cavity 3 inside the main body 4 through the groove formed by the second divided body 22. It is also expected to have the effect of concealing the sound-absorbing material 7.

The sealing material 23 can be securely installed by sandwiching it between the main body 4 and the second section 22. Any material that does not affect sound absorption performance can be used for the sealing material (e.g., glass cloth, nonwoven fabric, punched metal, etc.).

10 is a cross-sectional view showing dimensions in the XY plane for explaining the principle of the second embodiment, similar to that of FIG. 2. In the above, at the resonance frequency f0 of the sound absorber, Equations 1 and 2 are the same as those described above, but V2 in the following Equation 4 is used instead of V1 in Equation 3 in Equation 1.
Formula 4
V2 = A x B x L
V2: Cavity volume, A: Cavity length, B: Cavity width, L: Cavity height

In Figure 10, L, l, etc. are the dimensions of the opening, and the figure shows the relationship between the main body 4 and throat 5 of the sound absorber 2. Each dimension is an internal measurement because it relates to volume. According to this relationship, the cavity width B and cavity height L are determined by the size of the main body 4. Furthermore, the opening length a and cavity length A are determined by the installation environment. Therefore, because the throat l and/or opening width b are changeable, the resonance frequency can be adjusted to a desired value depending on the installation environment of the facility, the fixed size of the sound absorber main body, and as needed. Furthermore, because the portion formed by the throat 5 and opening 8 extends outside the main body 4, V2 in Figure 10 is larger than V1 in Figure 5(a), which allows for a lower resonance frequency.

Figure 11 is an XY cross-sectional view showing the assembled parts of a first modified example of the second embodiment. The second divided body 22 fits along the side of the main body 4, automatically determining the width of the opening 8 and reducing installation errors. Furthermore, the material and paint of the second divided body 22 allow for a uniform design.

Figure 12a is an XY cross-sectional view showing the assembled parts of the third embodiment, and Figure 12b is an XY cross-sectional view showing the separated parts of the third embodiment.

By providing the second segment 32 with a punched portion 32a on the first segment 31, the same effect can be expected without using a sealing material. Foreign matter does not enter the cavity 3. Because the only materials that need to be calibrated are the first segment 31 and the second segment 32, the number of parts can be reduced.

Figure 13 is a cross-sectional view showing dimensions in the XY plane for explaining the principle of the third embodiment, similar to Figure 2.

In the above, the resonant frequency f0 of the sound absorber is calculated using equations 1-3 above.

Figure 14a is an XY cross-sectional view showing a first modified example of the third embodiment, and Figure 14b is an XY cross-sectional view showing the first modified example of the third embodiment with parts separated.

Figure 14a shows a structure made up of a first divided body 33, a second divided body 34, and a third divided body 35. The external shape is made up of the second divided body 34, and the first divided body 33 can form a sealed structure for the second divided body 34. The third divided body 35 is provided to fix the position of the sound absorber 7.

By bending the end of the first segment 35, the folded part of the second segment fits into that part, resulting in a smooth back surface as shown in Figure 14a, allowing it to be installed tightly against a wall.

Figure 15a is an XY cross-sectional view showing the assembled parts of the fourth embodiment, and Figure 15b is an XY cross-sectional view showing the separated parts of the fourth embodiment.

By combining the first segment 41 with the second segment 42, the throat 5 and opening 8 can be formed on the outside of the first segment 41. Furthermore, by using a thick second segment, the surface is flat and the opening 8 can be formed with a groove, making it convenient for installation on the wall of a room, etc.

The second divided body 42 can be made of various materials such as wood, plastic, or metal. It is constructed by placing a cover material 23 on the first divided body 41 and then covering it with the second divided body 42. The second divided body 42 may be constructed in separate parts rather than as a single body.

FIG. 16 is a cross-sectional view showing dimensions for explaining the principle in the XY plane similar to FIG. 2 in the fourth embodiment.
In the above, the resonance frequency f0 of the sound absorber is calculated using the above equations 1, 2 and 4.

In Figure 16, L, l, etc. are the dimensions of the opening, and the figure shows the relationship between the main body 4 and throat 5 of the sound absorber 2. Each dimension is an internal measurement because it relates to volume. According to this relationship, the cavity width B and cavity height L are determined by the size of the main body 4. Furthermore, the opening length a and cavity length A are determined by the installation environment. Therefore, because the throat l and/or opening width b are changeable, the resonance frequency can be adjusted to a desired value depending on the installation environment of the facility, the fixed size of the sound absorber main body, and as needed. Furthermore, because the portion formed by the throat 5 and opening 8 extends outside the main body 4, V2 in Figure 16 is larger than V1 in Figure 5(a), which allows for a lower resonance frequency.

Figure 17 is an XY cross-sectional view showing a first modified example of the fourth embodiment. Providing a notch groove 42 in the second divided body 42 makes it possible to reduce weight. Since it will be installed indoors, it goes without saying that a lighter weight is better for portability and installation.

This invention can be used as a sound absorber that can be retrofitted to the walls, ceilings, floors, and pillars of a space.

1: Sound-absorbing structure, 2: Sound absorber, 3: Cavity, 4: Main body, 5: Throat, 6: Protrusion, 7: Sound-absorbing material, 8: Opening, 9: End cap, 10: Sound absorber, 11: First division, 12: Second division, 13: Second division, 20: Sound absorber, 21: First division, 22: Second division, 23: Screen, 24: Second division, 30: Sound absorber, 31: First division, 32: Second division, 32a: Punched portion, 33: First division, 34: Second division, 34a: Punched portion, 35: Third division, 40: Sound absorber, 41: First division Body, 42: Second division, 42a: Notch groove, 23: Screening material, 100: Indoor structure, 101: Hanging bolt, 102: Hanger, 103: Rough sill support, 104: Rough sill, 105: Mounting angle, 106: Mounting channel, 107: Ceiling board, 110: Runner, 111: Stud, 112: Foundation wall board, 113: Interior wall board, 114: Wall slab, 120: Floor slab, 121: Lower runner, 130: Support, B: Cavity width, a: Neck slit length, b: Neck slit width, L: Cavity height, l: Neck height

Claims (6)

A sound absorber to be attached to a space, which is installed on the surface of at least one of the ceiling, wall or floor surfaces facing the space, and a structure to be installed in the space (hereinafter referred to as "ceiling surface, etc."), or is exposed within the space, and has a main body extending in the longitudinal direction, a slit formed along the longitudinal direction of the main body, a cavity communicating with the slit, and end covers closing the longitudinal ends of the cavity, and this inner slit communicates with the space to absorb sound within the space,
the main body includes a first divided body that forms the cavity and a second divided body attached to a surface side of the first divided body, the second divided body having a throat portion that positions an opening of the slit toward the outside of the main body, and the throat portion is positioned outside the first divided body;
the throat portion is formed by the thickness of the surface side portion of the second segment;
A sound absorber in which the width of the opening in a direction perpendicular to the longitudinal direction is determined by the attachment position of the second divided body relative to the first divided body. A sound absorber as described in claim 1, wherein the main body has a pair of cavities on the left and right sides of the slit in a cross section perpendicular to the longitudinal direction, and sound-absorbing material is provided between each cavity and the slit. A sound absorber arrangement structure comprising the sound absorbers according to claim 1 or 2, in which the sound absorbers are oriented vertically and arranged horizontally on a wall surface. A sound absorber arrangement structure including the sound absorbers according to claim 1 or 2, wherein the sound absorbers are oriented vertically and arranged horizontally on a wall surface, with the lower ends of the sound absorbers attached to the floor. A sound absorber arrangement structure including the sound absorbers according to claim 1 or 2, wherein the sound absorbers are oriented vertically and arranged horizontally on a wall surface, with the lower ends of the sound absorbers spaced apart from the floor. A sound absorber arrangement structure comprising the sound absorbers according to claim 1 or 2, in which the sound absorbers are oriented horizontally and aligned vertically and attached to a wall surface.