JP2015215428A - Sound absorbing structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a novel sound absorbing structure that can be reduced in thickness as compared with a conventional sound absorbing structure using a passive system.SOLUTION: A sound absorbing structure according to the present technique comprises a plurality of thread-like parts and a plurality of elastic parts, wherein the plurality of thread-like parts are apart from each other and vibrate by receiving sound waves. The plurality of elastic parts have elasticity, bridge the plurality of thread-like parts, and attenuate the vibrations of the plurality of thread-like parts.

Description

  The present technology relates to a passive sound absorbing structure.

  There are two main silencing methods: an active method in which sound waves having opposite phases are transmitted to cancel the sound waves and muffled, and a passive method in which sound waves are attenuated by using a sound absorbing material or a reflective material. Unlike the active method, the passive method does not consume power, has a high degree of freedom in installation, and has a low cost.

  For example, Patent Document 1 describes a passive sound-absorbing material including a sound-absorbing layer having a porous sound-absorbing function and a skin layer made of a melt-blown fiber nonwoven fabric laminated on the surface side of the sound-absorbing layer. This sound absorbing material can reduce the weight of the sound absorbing material by using a melt blown fiber for the skin layer, and can improve the workability of attachment to a panel or the like.

JP 2009-18745 A

  However, in the sound absorbing material using the conventional passive method, it is necessary to enlarge the structure of the sound absorbing structure in order to generate a sufficient sound absorbing effect. For example, in a sound absorbing structure having a structure in which a plurality of protrusions are formed and sound waves reflected between the protrusions cancel each other, the size of the protrusions is determined by the wavelength of the sound waves, so the size of the protrusions cannot be reduced. It is difficult to reduce the thickness of the sound absorbing structure.

  In view of the circumstances as described above, an object of the present technology is to provide a sound absorbing structure that can be made thinner than a conventional passive sound absorbing structure.

A sound absorbing structure according to an embodiment of the present invention includes a plurality of thread-like portions and a plurality of elastic portions.
The plurality of filaments are separated from each other and vibrate upon receiving sound waves.
The plurality of elastic parts have elasticity, bridge the plurality of thread-like parts, and attenuate vibrations of the plurality of thread-like parts.

  According to this configuration, when a sound wave is incident on the sound absorbing structure, the thread-like part receives the sound wave and vibrates, and the elastic part attenuates the vibration of the thread-like part. The sound wave loses energy by vibrating the filamentous part, but since the vibration of the filamentous part is attenuated by the elastic part, the sound wave continuously loses energy to vibrate the filamentous part. Therefore, the sound wave is attenuated, that is, absorbed. The resonance frequency of the thread-like part can be adjusted by the density, diameter, etc. of the thread-like part, and since it is not necessary to increase the structure depending on the frequency of the sound wave to be absorbed, the thickness can be reduced.

  Each of the plurality of thread-like portions extends in a first direction and is separated in a second direction orthogonal to the first direction, and the plurality of elastic portions are configured so that the thread-like portions are separated from each other in the second direction. It may be cross-linked.

  According to this configuration, when sound waves are incident on the filamentous portion, the filamentous portion vibrates with the direction orthogonal to the extending direction as the amplitude direction. By bridging the thread-like part in the second direction, which is one of the directions orthogonal to the extending direction of the thread-like part, the elastic part can attenuate the vibration having the direction orthogonal to the extending direction of the thread-like part as the amplitude direction. Is possible.

  In addition to the second direction, the plurality of filaments are spaced apart in a third direction that is spaced apart in the first direction and the second direction, and the plurality of elastic portions are separated in the second direction and The thread-like portion may be cross-linked in the third direction.

  According to this configuration, the elastic portion bridges the thread portion in the second direction and the third direction, which are directions orthogonal to the extending direction of the thread portion, so that the direction orthogonal to the extending direction of the thread portion is the amplitude direction. Can be attenuated. Since a large number of filamentous portions are arranged in the third direction, it has a high sound-absorbing property with respect to sound waves incident from the third direction.

  The plurality of thread-like parts include a plurality of first thread-like parts extending in a first direction and a plurality of second thread-like parts extending in a second direction orthogonal to the first direction, The plurality of elastic parts may bridge the first thread-like part and the second thread-like part.

  According to this configuration, when sound waves are incident on the thread-like part, the first thread-like part and the second thread-like part vibrate with the direction orthogonal to the extending direction as the amplitude direction. Since the amplitude directions of the first thread-like part and the second thread-like part are different, attenuation of vibration by the elastic part is increased, and sound absorption can be improved.

  The first thread-like part and the second thread-like part may be knitted.

  According to this configuration, it is possible to improve the strength of the sound absorbing structure without disturbing the vibration of the first thread-like part and the second thread-like part.

  The plurality of thread portions may extend in different directions, and the plurality of elastic portions may bridge the plurality of thread portions that extend in different directions.

  According to this configuration, the filamentous portion vibrates with various directions as amplitude directions. That is, it is possible to absorb sound waves incident on the sound absorbing structure from all directions.

  The plurality of thread-like portions constitute a first layer and a second layer spaced from the first layer, and the plurality of elastic portions are between the first layer and the second layer. The thread-like parts are cross-linked, and the plurality of thread-like parts and the plurality of elastic parts are made of different materials.

  According to this configuration, the sound absorbing structure has a structure in which the layers of the thread-like portions and the elastic portions made of different materials are alternately stacked. For this reason, this sound absorbing structure can be easily shaped by a three-dimensional printer.

  Each of the plurality of filamentous portions may have the same resonance frequency.

  According to this configuration, when a sound wave having a frequency matching the resonance frequency of the filamentous portion is incident on the sound absorbing structure, the filamentous portion vibrates and is absorbed. On the other hand, even if a sound wave having a frequency different from the resonance frequency of the filamentous portion is incident on the sound absorbing structure, the filamentous portion does not vibrate and is not absorbed. Therefore, a sound absorbing structure that specifically absorbs sound waves of a specific frequency can be obtained.

  The plurality of thread-like parts may include a first thread-like part having a first resonance frequency and a second thread-like part having a second resonance frequency different from the first resonance frequency.

  According to this configuration, the first thread-like part vibrates in response to a frequency that matches the first resonance frequency, and the second thread-like part vibrates in response to a frequency that matches the second resonance frequency. That is, this sound absorbing structure can absorb sound waves having at least two types of frequencies. By forming a thread-like portion having a higher resonance frequency, it is possible to obtain a sound absorbing structure that can absorb sound waves of various frequencies.

  The first thread-like part and the second thread-like part may have different densities.

  The density of the thread-like portion affects its resonance frequency. Therefore, by making the density of the thread-like parts different, it becomes possible to provide the first thread-like part and the second thread-like part having different resonance frequencies. The density of the thread-like part can be adjusted by, for example, the constituent material of the thread-like part and its internal structure.

  The first thread-like part and the second thread-like part may have different lengths.

  The length of the thread affects the resonance frequency. Therefore, by making the lengths of the thread-like parts different, it is possible to provide the first thread-like part and the second thread-like part having different resonance frequencies.

  The first thread-like part and the second thread-like part may have different diameters.

  The diameter of the thread-like portion affects its resonance frequency. Therefore, by making the diameters of the thread-like parts different, it is possible to provide the first thread-like part and the second thread-like part having different resonance frequencies.

A sound absorbing structure according to another embodiment of the present invention includes a plurality of thread-like parts and a plurality of elastic parts. The plurality of elastic parts are a plurality of thread-like parts spaced apart from each other, and can vibrate.
The plurality of elastic portions bridge the plurality of thread-like portions and attenuate vibrations of the plurality of thread-like portions.

  As described above, it is an object of the present technology to provide a sound absorbing structure that can be made thinner than a conventional sound absorbing structure using a passive system. Note that the effects described herein do not necessarily limit the present invention, and the present invention only needs to achieve any of the effects described in the present disclosure.

It is a top view of a sound absorption structure concerning an embodiment of this art. It is sectional drawing of the sound absorption structure It is a schematic diagram which shows operation | movement of the sound absorption structure. It is sectional drawing of the thread-like part of the sound absorption structure. It is sectional drawing of the thread-like part of the sound absorption structure. It is sectional drawing of the sound absorption structure. It is sectional drawing of the sound absorption structure It is a top view of the sound absorption structure. It is sectional drawing of the sound absorption structure. It is sectional drawing of the other structure of the sound absorption structure It is sectional drawing of the other structure of the sound absorption structure. It is the top view and sectional drawing of other structures of the sound absorption structure. It is the top view and sectional drawing of other structures of the sound absorption structure. It is a top view of other structures of the sound absorption structure. It is sectional drawing of the other structure of the sound absorption structure. It is a schematic diagram which shows the manufacturing method of the sound absorption structure. It is a schematic diagram which shows the manufacturing method of the sound absorption structure. It is a schematic diagram which shows the manufacturing method of the sound absorption structure.

  Hereinafter, embodiments according to the present technology will be described with reference to the drawings.

[Configuration of sound absorbing structure]
FIG. 1 is a plan view showing a partial configuration of a sound absorbing structure 100 according to the present embodiment, and FIG. 2 is a cross-sectional view thereof. In the following drawings, three directions orthogonal to each other are defined as an X direction, a Y direction, and a Z direction, respectively.

  As shown in these drawings, the sound absorbing structure 100 has a thread-like portion 101 and an elastic portion 102.

  There are a plurality of thread-like portions 101, each of which can be formed in a thread-like structure extending in the X direction and separated in the Y direction. The thread-like portions 101 are connected to each other by an elastic portion 102, and are configured to vibrate by sound waves when sound waves enter the sound absorbing structure 100.

  The length and diameter of the thread-like portion 101 are not particularly limited and can be determined according to the frequency of the sound wave to be absorbed. For example, the diameter of the thread-like part 101 can be about several μm to several mm, and the length of the thread-like part 101 can be about several mm to several cm. The interval between the adjacent thread portions 101 is not particularly limited, and can be determined according to the frequency of the sound wave to be absorbed.

  The thread-like portion 101 can be made of a synthetic resin such as PMMA (Poly methyl methacrylate). Moreover, the thread part 101 is not restricted to what consists of synthetic resins, but can also consist of various materials, such as a metal and a fiber. The sound absorbing structure 100 can also be manufactured by a three-dimensional printer, and the thread-like portion 101 is made of a material that can be formed by the three-dimensional printer, for example, a photocurable material, a thermoplastic material, or a powder material. You can also In addition, each thread part 101 may consist of the same material, and may consist of a different material.

  There are a plurality of elastic portions 102, which are configured to bridge between the thread portions 101 and attenuate the vibration of the thread portions 101 that vibrate upon receiving sound waves. The elastic part 102 can bridge the thread part 101 in the Y direction, which is the direction in which the thread part 101 is separated.

  The elastic part 102 has elasticity, and the vibration of the thread-like part 101 can be attenuated by elasticity. The elastic part 102 can bridge the thread-like part 101 in the direction in which the thread-like part 101 is separated. When the thread-like part 101 is separated in the Y-direction as shown in FIG. 101 can be cross-linked. The elastic part 102 has a shape bent in a spring shape as shown in FIGS. 1 and 2 and can attenuate the vibration of the thread-like part 101 by causing elastic deformation. Further, the elastic portion 102 does not necessarily have a bent shape.

  The elastic part 102 can be made of a synthetic resin such as PMMA (Poly methyl methacrylate). The elastic portion 102 is not limited to one made of a synthetic resin, and can be made of various materials such as metal. The sound absorbing structure 100 can be manufactured by a three-dimensional printer, and the elastic portion 102 is made of a material that can be formed by the three-dimensional printer, for example, a photocurable material, a thermoplastic material, or a powder material. You can also In addition, each elastic part 102 may consist of the same material, and may consist of a different material. Further, the material of the elastic portion 102 may be the same as or different from the material of the thread-like portion 101.

[Operation of sound absorbing structure]
FIG. 3 is a schematic diagram showing the operation of the sound absorbing structure 100. As shown in the figure, when the sound wave P enters the sound absorbing structure 100, the filament 101 receives the sound wave P and vibrates. The vibration direction of the thread-like portion 101 is not limited to that shown in the figure, and may be a direction (any direction on the YZ plane) perpendicular to the extending direction (X-direction) of the thread-like portion 101.

  When the thread part 101 receives the sound wave P and vibrates, the elastic part 102 that bridges the thread part 101 attenuates the vibration of the thread part 101. The sound wave P loses energy by vibrating the thread-like part 101. However, since the vibration of the thread-like part 101 is attenuated by the elastic part 102, the sound wave P continuously loses energy to vibrate the thread-like part 101. . Therefore, the sound wave P is attenuated, that is, absorbed.

[Resonant frequency of thread-like part]
As described above, the thread-like portion 101 vibrates due to the sound wave incident on the sound absorbing structure 100. For this reason, the resonance frequency of the thread-like part 101 can be adjusted by the configuration of the thread-like part 101 and the elastic part 102.

  Specifically, the resonance frequency of the filamentous part 101 can be adjusted by the density of the filamentous part 101. FIG. 4 is a cross-sectional view of the thread-like portion 101. As shown in FIG. 4A, the density of the thread-like part 101 can be adjusted by providing a gap in the thread-like part 101. You may adjust the density of the thread-like part 101 with the diameter of a space | gap. Moreover, the density of the thread-like part 101 can be adjusted by making the thread-like part 101 porous as shown in FIG.

  FIG. 5 is a cross-sectional view of various thread portions 101 having a rectangular cross-sectional shape. As shown in FIG. 5 (a), the thread-like portion 101 may have a rectangular shape without a gap, or may have a rectangular gap as shown in FIG. 5 (b). Further, the thread-like portion 101 may have a circular gap as shown in FIG. Thus, the density of the thread-like part 101 can be adjusted by the cross-sectional shape of the thread-like part 101, and the resonance frequency of the thread-like part 101 can be adjusted.

  In one sound absorbing structure 100, the density of the thread portions may be different. FIG. 6 is a cross-sectional view of the sound absorbing structure 100 having the thread-like portions 101 having different densities. As shown in the figure, the thread-like part 101 has a first thread-like part 101a having a predetermined density and a second thread-like part 101b having a density smaller than that of the first thread-like part 101a. In this case, the resonance frequency of the first filamentous portion 101a and the resonance frequency of the second filamentous portion 101b are different, and the sound absorbing structure 100 can absorb sound waves of the respective frequencies. The filamentous portion 101 may have a variety of densities.

  Further, the resonance frequency of the thread-like part 101 may be adjusted by the diameter of the thread-like part 101. FIG. 7 is a cross-sectional view of the sound absorbing structure 100 having the thread-like portion 101 having a different diameter. As shown in the figure, the thread-like part 101 has a first thread-like part 101a having a predetermined diameter and a second thread-like part 101b having a larger diameter than the first thread-like part 101a. In this case, the resonance frequency of the first filamentous portion 101a and the resonance frequency of the second filamentous portion 101b are different, and the sound absorbing structure 100 can absorb sound waves of the respective frequencies. The filamentous portion 101 may have a variety of diameters.

  Further, the resonance frequency of the thread-like part 101 may be adjusted according to the length of the thread-like part 101. FIG. 8 is a plan view of the sound absorbing structure 100 having the thread-like portions 101 having different lengths. As shown in the figure, the thread-like part 101 has a first thread-like part 101a having a predetermined length and a second thread-like part 101b having a shorter length than the first thread-like part 101a. In this case, the resonance frequency of the first filamentous portion 101a and the resonance frequency of the second filamentous portion 101b are different, and the sound absorbing structure 100 can absorb sound waves of the respective frequencies. The filamentous portion 101 may have various lengths.

  Further, the resonance frequency of the thread-like part 101 can be adjusted by the constituent material of the thread-like part 101. This is because the elasticity and strength of the thread-like part 101 differ depending on the constituent material of the thread-like part 101 and affect the resonance frequency.

  Further, the resonance frequency of the thread-like part 101 can be adjusted by the interval between the thread-like parts 101. This is because the length of the elastic portion 102 varies depending on the interval between the thread portions 101, and the elastic force of the elastic portion 102 differs. Further, the elastic force of the elastic portion 102 may be different depending on the constituent material and shape of the elastic portion 102. FIG. 9 shows examples of various shapes of the elastic portion 102. The elastic portion 102 may have a curved shape as shown in FIG. 9A, or may have a linear shape as shown in FIG. 9B. The resonance frequency of the thread-like portion 101 can also be adjusted by the interval between the elastic portions 102 (crosslinking interval).

  Thus, the resonance frequency of the thread-like part 101 can be adjusted by the configuration of the thread-like part 101 and the elastic part 102. For this reason, it is possible to limit the frequency at which the sound absorbing structure 100 can absorb sound to a specific frequency, and to obtain a sound absorbing structure that specifically absorbs only a sound wave having a specific frequency. Further, the sound absorbing structure 100 may be configured to have various frequencies that can absorb sound, and a sound absorbing structure that absorbs sound waves having various frequencies.

[Various structures of sound absorbing structures]
The structure of the sound absorbing structure 100 according to the present invention is not limited to the structure shown in FIGS. Various structures that the sound absorbing structure 100 can take will be described. 10 to 15 are schematic views showing the sound absorbing structure 100 having various structures.

  FIG. 10 is a cross-sectional view of a sound absorbing structure 100 having another structure. As shown in the figure, the thread-like portion 101 extends in the X direction and may be separated not only in the Y direction but also in the Z direction. The elastic part 102 can bridge | crosslink the thread-like part 101 not only in the Y direction but also in the Z direction. The sound absorbing structure 100 has a high sound absorbing property with respect to a sound wave incident on the sound absorbing structure 100 from the Z direction because a large number of thread-like portions 101 are arranged in the Z direction.

  Fig.11 (a) is a top view of the sound-absorbing structure 100 of another structure, FIG.11 (b) is the sectional drawing. As shown in the figure, the thread-like part 101 may include a first thread-like part 101a extending in the X direction and a second thread-like part 101b extending in the Y direction. The first thread-like part 101a and the second thread-like part 101b may be separated in the Z direction or may be in contact in the Z direction. The elastic part 102 can bridge | crosslink not only between the 1st thread-like part 101a and the 2nd thread-like part 101b but between the 1st thread-like part 101a and the 2nd thread-like part 101b. . In this structure, since the amplitude directions of the first thread-like part 101a and the second thread-like part 101b are different, the vibration attenuation by the elastic part 102 becomes larger, and the sound absorption can be improved.

  12A is a plan view of a sound absorbing structure 100 having another structure, and FIG. 12B is a cross-sectional view thereof. As shown in the figure, the thread part 101 includes a first thread part 101a extending in the X direction and a second thread part 101b extending in the Y direction, and the first thread part 101a and the second thread form. The part 101b may be knitted. The elastic part 102 can bridge | crosslink not only between the 1st thread-like part 101a and the 2nd thread-like part 101b but between the 1st thread-like part 101a and the 2nd thread-like part 101b. . In this structure, the first thread-like portion 101a and the second thread-like portion 101b are knitted, so that the vibration of the first thread-like portion 101a and the second thread-like portion 101b is not hindered. Strength can be improved.

  FIG. 13 is a plan view of a sound absorbing structure 100 having another structure. As shown in the figure, each of the thread portions 101 may be stretched in a three-dimensional random direction. The elastic part 102 can bridge | crosslink between the threadlike parts 101 extended in a random direction. Since the thread-like portion 101 extends in a random direction, it has a high sound absorbing property with respect to a sound wave incident on the sound absorbing structure 100 from various directions.

  FIG. 14 is a plan view of a sound absorbing structure 100 having another structure. As shown in the figure, the thread portion 101 may have a branch structure. The elastic part 102 not only bridges the adjacent thread parts 101 but also bridges the branched thread parts 101. Further, the thread-like portion 101 may be, for example, net-like.

  FIG. 15 is a cross-sectional view of a sound absorbing structure 100 having another structure. As shown in the figure, the thread-like portion 101 may constitute a layer. In the same figure, the 1st thread-like part layer 101c which consists of the thread-like part 101, and the 2nd thread-like part layer 101d are shown. The first thread-like part layer 101c and the second thread-like part layer 101d can be separated from each other in the Z direction. The elastic part 102 can bridge the thread-like parts 101 of each layer between the first thread-like part layer 101c and the second thread-like part layer 102d.

[Method for producing sound absorbing structure]
The method for manufacturing the sound absorbing structure 100 is not particularly limited, but can be manufactured using, for example, a three-dimensional printer. 16 to 18 are schematic views showing a method of manufacturing the sound absorbing structure 100 using a three-dimensional printer. The sound absorbing structure 100 can be manufactured while laminating the optical modeling material for each layer L along the X direction as shown in FIG. Each layer L includes a thread part 101 and an elastic part 102, but the thread part 101 and the elastic part 102 can be made of the same stereolithography material. Further, by using an ink jet type three-dimensional printer, the thread portion 101 and the elastic portion 102 can be made of different kinds of optical modeling materials.

  Further, as shown in FIG. 17, the sound absorbing structure 100 can be manufactured while stacking the optical modeling material for each layer L along the Y direction. As shown in the figure, when the thread part 101 extends in the X direction and is separated in the Y direction, the thread part 101 and the elastic part 102 can be made of different types of optical modeling materials.

  The sound absorbing structure 100 can also be manufactured while laminating the optical modeling material for each layer L along the Z direction as shown in FIG. As shown in the figure, the thread-like portion 101 and the elastic portion 102 are made of different types of optical modeling materials by forming the thread-like portion 101 in layers and forming an elastic portion 102 between the layers (see FIG. 15). It can also consist of. In this case, the thread-like portion 101 can be extended in various directions in the layer.

[Application of sound absorbing structure]
The sound absorbing structure 100 can be used for various purposes. For example, the sound absorbing structure 100 can be used as a sound absorbing material or a sound insulating material for a building. Specifically, it is possible to provide a building with a curtain, a window, a wall, a door, or the like that includes the sound absorbing structure 100 or includes the sound absorbing structure 100 as a partial structure. As a result, the inside of the building can be shielded from noise outside the building, or sound leakage from a home theater or the like can be prevented.

  Moreover, by arranging the sound absorbing structure 100 on the wall surface of the speaker box, it is possible to prevent reflection of unnecessary sound waves in the speaker box, improve the sound quality of the speaker, or prevent sound leakage. Furthermore, by using the sound absorbing structure 100 as a sound insulating material for an automobile or the like, it is possible to prevent the engine sound from reaching the passenger compartment and to insulate the engine sound. In addition to this, the sound absorbing structure 100 can be used for various purposes as a sound absorbing material or a sound insulating material.

  In addition, this technique can also take the following structures.

(1)
A plurality of thread-like parts spaced apart from each other, a plurality of thread-like parts vibrating in response to sound waves;
A sound-absorbing structure comprising: a plurality of elastic parts that have elasticity, bridge the plurality of thread-like parts, and attenuate vibrations of the plurality of thread-like parts.

(2)
The sound absorbing structure according to (1) above,
Each of the plurality of thread-like portions extends in a first direction and is separated in a second direction orthogonal to the first direction;
The plurality of elastic portions are sound-absorbing structures that bridge the thread-like portions in the second direction.

(3)
The sound absorbing structure according to (1) or (2) above,
In addition to the second direction, the plurality of thread-like portions are separated in a third direction that is separated in the first direction and the second direction,
The plurality of elastic portions are sound-absorbing structures that bridge the thread-like portions in the second direction and the third direction.

(4)
The sound absorbing structure according to any one of (1) to (3) above,
The plurality of thread-like parts include a plurality of first thread-like parts extending in a first direction and a plurality of second thread-like parts extending in a second direction orthogonal to the first direction,
The plurality of elastic portions are sound-absorbing structures that bridge the first thread-like part and the second thread-like part.

(5)
The sound absorbing structure according to any one of (1) to (4) above,
The sound absorbing structure in which the first thread-like part and the second thread-like part are knitted.

(6)
The sound absorbing structure according to any one of (1) to (5) above,
The sound absorbing structure according to claim 1,
The plurality of filamentous portions extend in different directions from each other,
The sound absorbing structure, wherein the plurality of elastic portions bridges the plurality of thread-like portions extending in different directions.

(7)
The sound absorbing structure according to any one of (1) to (6) above,
The plurality of filamentous portions constitutes a first layer and a second layer spaced from the first layer,
The plurality of elastic portions bridges the thread-like portion between the first layer and the second layer,
The plurality of thread-like portions and the plurality of elastic portions are sound absorbing structures made of different materials.

(8)
The sound absorbing structure according to any one of (1) to (7) above,
Each of the plurality of thread-like portions has a sound absorption structure having the same resonance frequency.

(9)
The sound absorbing structure according to any one of (1) to (8) above,
The plurality of thread-like parts include a first thread-like part having a first resonance frequency and a second thread-like part having a second resonance frequency different from the first resonance frequency.

(10)
The sound absorbing structure according to any one of (1) to (9) above,
The first thread-like part and the second thread-like part have different densities.

(11)
The sound absorbing structure according to any one of (1) to (10) above,
The first thread-like part and the second thread-like part have different lengths.

(12)
The sound absorbing structure according to any one of (1) to (11) above,
The first thread-like part and the second thread-like part have different diameters.

(13)
A plurality of thread-like parts spaced apart from each other, and a plurality of thread-like parts capable of vibrating;
A sound absorbing structure comprising: a plurality of elastic parts that bridge the plurality of thread-like parts and attenuate vibrations of the plurality of thread-like parts.

DESCRIPTION OF SYMBOLS 100 ... Sound absorption structure 101 ... Thread part 102 ... Elastic part

Claims (13)

A plurality of thread-like parts spaced apart from each other, a plurality of thread-like parts vibrating in response to sound waves;
A sound absorbing structure comprising: a plurality of elastic portions that have elasticity, bridge the plurality of thread-like portions, and attenuate vibrations of the plurality of thread-like portions. The sound absorbing structure according to claim 1,
Each of the plurality of thread-like portions extends in a first direction and is separated in a second direction orthogonal to the first direction;
The plurality of elastic portions are sound-absorbing structures that bridge the thread-like portions in the second direction. The sound absorbing structure according to claim 2,
In addition to the second direction, the plurality of filaments are spaced apart in a third direction that is spaced apart in the first direction and the second direction,
The plurality of elastic portions bridges the thread-like portion in the second direction and the third direction. The sound absorbing structure according to claim 1,
The plurality of thread-like parts include a plurality of first thread-like parts extending in a first direction and a plurality of second thread-like parts extending in a second direction orthogonal to the first direction,
The plurality of elastic portions are sound-absorbing structures that bridge the first thread-like part and the second thread-like part. The sound absorbing structure according to claim 4,
The first thread-like part and the second thread-like part are knitted into a sound absorbing structure. The sound absorbing structure according to claim 1,
The plurality of filamentous portions extend in different directions,
The sound-absorbing structure, wherein the plurality of elastic portions bridges the plurality of thread-like portions extending in different directions. The sound absorbing structure according to claim 1,
The plurality of filamentous portions constitute a first layer and a second layer spaced apart from the first layer,
The plurality of elastic portions bridge the thread-like portion between the first layer and the second layer,
The plurality of filamentous portions and the plurality of elastic portions are made of different materials. The sound absorbing structure according to claim 1,
The plurality of thread-like portions each have a same resonance frequency. A sound absorbing structure according to claim 8,
The plurality of thread-like parts include a first thread-like part having a first resonance frequency and a second thread-like part having a second resonance frequency different from the first resonance frequency. The sound absorbing structure according to claim 9,
The first thread-like part and the second thread-like part have different densities. The sound absorbing structure according to claim 9,
The first thread-like part and the second thread-like part have different lengths. The sound absorbing structure according to claim 9,
The first thread-like part and the second thread-like part have different diameters. A plurality of thread-like parts spaced apart from each other, and a plurality of thread-like parts capable of vibrating;
A sound-absorbing structure comprising: a plurality of elastic parts that bridge the plurality of thread-like parts and attenuate vibrations of the plurality of thread-like parts.

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