JP2014015797A - Sound absorption panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sound absorption panel which can be made thinner than the conventional one and of which thickness can be adjusted.SOLUTION: A sound absorption panel 10A is configured such that a sound absorption plate 11, a sound wave interference structure 12, and a reflector plate 13 are overlapped together and the peripheries thereof are held by a frame mold 14. The sound absorption plate 11 is supported by the frame mold 14 so as to move back and forth with respect to the front side. The sound wave interference structure 12 is made by overlapping two or more unit laminates 20 together, and the unit laminate 20 is constituted of a nonwoven fabric layer 21 made of heat-resistant and flame-resistant fibers and porous metal foil 22 superposed thereon. Therefore, the thickness of the sound wave interference structure 12 becomes small. Accordingly, the sound absorption panel 10A can be made thin and the thickness of the sound absorption panel 10A can be adjusted by increasing or decreasing the number of unit laminates 20.

Description

  The present invention relates to a sound-absorbing panel that can be used for various soundproofing applications, and more particularly to a sound-absorbing panel that can be made thinner and can be adjusted in thickness, and can exhibit excellent sound-absorbing performance. .

Patent Document 1 discloses a sound absorbing plate (sound absorbing material) that absorbs and transmits sound from the surface, a sound wave interference air layer (sound absorbing layer) that causes sound waves to interfere and attenuate, and a reflector (sound insulating material) that reflects sound waves. ) Are arranged in a three-layer structure from the front surface (sound absorbing surface) side to the back surface (sound insulating surface) side, and a sound absorbing panel having a structure held by a mold is disclosed.
Since this sound absorbing panel urges and supports the sound absorbing plate toward the surface side so as to be able to move forward and backward, the sound absorbing plate is smoothly vibrated by the sound wave, so that the sound absorbing plate sufficiently absorbs the sound wave. Can do. Further, the sound wave interference air layer can absorb incident sound waves and sound waves reflected from the reflecting plate by interference and attenuation. Therefore, reflection of sound waves on the front surface side or reverberation from the back surface side can be satisfactorily suppressed, and excellent sound absorption performance can be realized.
Furthermore, since this sound absorbing panel is a panel in which the three-layer structure is held by a mold, it can be easily installed. Therefore, it is suitable for various uses such as general factory noise countermeasures, large soundproof walls for large-scale facilities, small soundproof walls for small facilities, and simple noise countermeasures used at construction sites. it can.

JP 2000-309989 A (Patent No. 3225283)

In recent years, the level required for noise countermeasures has increased, and soundproofing has been demanded in various fields that have not been assumed in the past. Therefore, from the viewpoint of improving installation properties, it is desirable to make the sound absorbing panel thinner, and it is desirable that the thickness of the sound absorbing panel can be adjusted according to the purpose of soundproofing.
The present invention has been made to solve such problems, and an object of the present invention is to provide a sound-absorbing panel that can be made thinner than before and can be adjusted in thickness.

In order to solve the above problems, a sound absorbing panel according to the present invention is disposed on the front side, absorbs sound waves and transmits the sound waves to the inside, and disposed on the back side to reflect the sound waves transmitted from the front side. A reflection plate, a sound wave interference structure that is disposed between the sound wave absorption plate and the reflection plate and causes the sound waves to interfere and attenuate, and the sound wave absorption plate, the sound wave interference structure, and the reflection plate are stacked. A mold frame that holds the periphery in a combined state and supports the acoustic wave absorbing plate so as to freely move forward and backward toward the front side, and the acoustic interference structure overlaps the nonwoven fabric layer and the nonwoven fabric layer. It is configured as two or more unit laminates composed of the combined porous metal foils.
According to the said structure, since the unit laminated body which consists of porous metal foil and a nonwoven fabric layer becomes 1 set, and this superposes two or more and comprises a sound wave interference structure, it can attenuate a sound wave greatly. And can exhibit excellent sound absorption performance. Moreover, since the acoustic interference structure is composed of the porous metal foil and the nonwoven fabric layer, the thickness thereof is reduced. Therefore, the thickness of the sound absorbing panel can be significantly reduced as compared with the conventional one. In addition, the thickness of the sound absorbing panel can be adjusted by increasing / decreasing the number of unit laminates constituting the sound wave interference structure, and by increasing / decreasing the number of unit laminates, absorption of sound waves in a specific frequency range can be achieved. Performance can also be improved.
In the sound absorbing panel having the above structure, the sound wave interference structure is disposed between the sound absorbing plate and the reflecting plate so that the outermost porous metal foil is positioned on the front side. Also good.
In the sound absorbing panel having the above configuration, the nonwoven fabric layer may be a dry nonwoven fabric made of organic fibers or carbon fibers, and the nonwoven fabric layer is a heat-resistant and flame-resistant treatment of acrylic fibers. The dry-type nonwoven fabric which uses the carbon fiber obtained by doing may be used.
In the sound absorbing panel having the above-described configuration, the porous metal foil may be a light metal foil having pores formed on the entire surface.
Further, in the sound absorbing panel having the above configuration, the sound wave absorbing plate is a rigid mesh plate, and the holes serving as the mesh are formed in a direction inclined with respect to the normal line direction of the sound absorbing plate. It may be.
In the sound absorbing panel having the above configuration, the sound wave absorbing plate, the reflecting plate, and the mold may be made of light metal.
Moreover, in the sound absorption panel of the said structure, the structure by which the said reflecting plate is integrated with the said formwork may be sufficient.

  In the present invention, with the above configuration, there is an effect that it is possible to provide a sound absorbing panel that can be made thinner than before and can be adjusted in thickness.

(A) is a schematic sectional drawing which shows an example of a structure of the sound absorption panel which concerns on embodiment of this invention, (b) is an enlarged structure of the surface side (sound absorption surface side) of the sound absorption panel shown to (a). (C) is a cross-sectional view in the vicinity of the mold, schematically showing the number of unit laminated bodies constituting the sound wave interference multilayer structure in the sound-absorbing panel shown in (a). is there. (A) And (b) is sectional drawing of a mold frame vicinity which shows an example of the structure which couple | bonds the sound absorption panels shown to Fig.1 (a) with a mold frame, (c) is implementation of this invention. It is a schematic sectional drawing which shows the other example of the sound absorption panel which concerns on a form. (A)-(c) is a graph of the sound wave which shows the result of the typical Example of this invention. (A)-(e) is a typical perspective view which shows the typical usage example of the sound absorption panel shown to Fig.1 (a) or FIG.2 (c).

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In the following description, the same or corresponding elements are denoted by the same reference symbols throughout the drawings, and redundant description thereof is omitted.
[Configuration of sound absorbing panel]
As shown in FIG. 1A, a sound absorbing panel 10A according to an embodiment of the present invention includes a sound wave absorbing plate 11, a sound wave interference structure 12, a reflecting plate 13, and a formwork 14. The surroundings of the sound absorbing plate 11, the sound wave interference structure 12, and the reflecting plate 13 are held by the mold 14 in a state of being superposed in this order. In other words, the sound wave absorbing plate 11 and the reflecting plate 13 are opposed to each other, and the sound wave interference structure 12 is sandwiched therebetween and held by the mold 14 in this state. In addition, the block arrow A in Fig.1 (a) has shown the surface (sound absorption surface) of the side which absorbs the sound wave in 10 A of sound absorption panels. In the present embodiment, this sound absorbing surface A is the surface.
The sound wave absorbing plate 11 is disposed on the sound absorbing surface A side (front side) of the sound absorbing panel 10 </ b> A, is configured to absorb sound waves and transmit them inside, and is held by the mold 14 so as to freely move forward and backward. The specific configuration of the sound wave absorbing plate 11 is not particularly limited as long as it can be vibrated by the propagated sound wave and can transmit the sound wave into the sound absorbing panel 10A as described later. In this embodiment, as schematically shown also in the enlarged cross-sectional view of FIG. With this configuration, it is possible to achieve good vibration and good transmission of sound waves.
Here, in the present embodiment, as shown in FIG. 1B, the holes (mesh holes 110) serving as the mesh of the sound absorbing plate 11 are inclined with respect to the normal direction N of the sound absorbing plate 11. It is preferably formed in H. Assuming that the formation direction of the mesh holes 110 is the hole formation direction H for convenience, when the sound absorbing panel 10A is installed, the mesh hole 110 faces downward by setting the hole formation direction H downward. For example, when a water droplet or the like adheres to the sound absorbing surface A of the sound absorbing panel 10A, the water droplet flows down in the flow direction of the block arrow D in the figure, but the mesh hole 110 is not in the flow direction D but on the opposite side of the flow direction D. It will be suitable for. Therefore, it is difficult for water droplets to enter the sound absorbing panel 10A, and a decrease in sound absorbing performance can be suppressed.

As shown in FIG. 1A, the sound wave interference structure 12 is disposed between the sound wave absorption plate 11 and the reflection plate 13, and is configured to interfere and attenuate sound waves. The nonwoven fabric layer 21 and the porous metal foil 22 are used. A combination (set) of one nonwoven fabric layer 21 and one porous metal foil 22 constitutes a “unit laminate 20”, and the sound wave interference structure 12 includes two or more unit laminates 20. It is configured as a superposition.
The nonwoven fabric layer 21 constituting the unit laminate 20 is not particularly limited as long as it is a general nonwoven fabric (felt). However, as will be described later, fibers having heat resistance and flame resistance (referred to as heat resistant flame resistant fibers for convenience). A non-woven fabric made of is particularly preferred. The thickness of the nonwoven fabric layer 21 is not particularly limited, and a suitable thickness may be appropriately set according to various conditions (frequency characteristics of sound waves to be sound-absorbed, strength of the sound waves, use conditions of the sound-absorbing panel 10A, etc.). it can. In general, the preferable thickness can be in the range of 1.0 to 3.0 mm, and more preferably in the range of 1.5 to 2.5 mm.
Similarly, the basis weight of the nonwoven fabric layer 21 is not particularly limited, and a suitable value can be selected according to various conditions. In general, the basis weight is preferably in the range of 100 to 500 g / m ² , and more preferably in the range of 200 to 400 g / m ² .
The fiber used for the nonwoven fabric layer 21 can suitably be used as a general nonwoven fabric. Of these, the heat-resistant and flame-resistant fibers described above are particularly preferable. As shown in the examples to be described later, by using the nonwoven fabric layer 21 using heat-resistant and flame-resistant fibers and the porous metal foil 22 in combination as the sound wave interference structure 12, it is possible to realize a very excellent sound absorbing performance. it can.
Here, the specific types of heat-resistant and flame-resistant fibers are not particularly limited, but organic fibers (aramid fibers, polybenzimidazole fibers, novoloid fibers), not non-carbon inorganic fibers (glass fibers, metal fibers, etc.) ) Or carbon-based fibers can be preferably used, and among these, carbon-based fibers obtained by heat- and flame-resistant treatment (fired carbonization) using acrylic fibers as raw materials can be particularly preferably used.
In the heat-resistant and flame-resistant fiber, the specific heat resistance and flame resistance level are not particularly limited as long as superior heat resistance and flame resistance can be realized as compared with general flammable fibers. With respect to heat resistance, it is only necessary to have durability against a temperature of at least 150 ° C., and it is particularly preferable to have durability at about 200 ° C. (within a range of 180 to 220 ° C.). Regarding the flame resistance, the limiting oxygen index (LOI) may be 25 or more, more preferably 30 or more, and particularly preferably 50 or more. The carbon-based fiber made from acrylic fiber as a raw material can exhibit durability even at a high temperature of about 200 ° C., and has a LOI of 50 or more, so that it can be particularly preferably used as the nonwoven fabric layer 21 of the present invention. .
The method for producing the nonwoven fabric layer 21 is not particularly limited, and a nonwoven fabric produced by a known fleece forming method using the above-mentioned heat and flame resistant fibers can be suitably used. Preferably, a dry method produced by a dry method is used. Nonwoven fabric can be used.
The specific structure of the porous metal foil 22 constituting the unit laminate 20 is not particularly limited, and a large number of pores 23 are formed on the entire surface of a known metal foil as schematically shown in FIG. Anything that has been done. The size of the pores 23 is not particularly limited, and a suitable size can be appropriately selected according to various conditions. Generally, it may be a hole of less than 1 mm, that is, a micrometer unit.
The number of the pores 23 is not particularly limited, and a suitable number per unit area can be appropriately selected according to various conditions. In general, it preferred as long 200,000 / m ² above, with the 300,000 / m ² or more.
Further, the porous metal foil 22 has a reinforcing layer laminated on one surface thereof (preferably, the surface that is in contact with the nonwoven fabric layer 21 when the unit laminated body 20 is superimposed on the nonwoven fabric layer 21). It may be. Thereby, the strength of the porous metal foil 22 can be improved. The specific type of the reinforcing layer is not particularly limited, and any known material can be suitably used as long as the porous metal foil 22 can be reinforced.
Although the specific kind of metal foil used for the porous metal foil 22 is not particularly limited, a light metal foil (light metal foil) can be preferably used from the viewpoint of reducing the weight of the sound absorbing panel 10A. Typical light metals include aluminum, magnesium, titanium and the like. These light metals may be used alone or as an alloy. In this embodiment, in addition to being able to exhibit excellent sound absorption performance, there are also advantages in terms of workability, cost, and the like, and therefore aluminum or an alloy foil thereof can be suitably used.
The acoustic interference structure 12 is configured by superimposing two or more unit laminated bodies 20 obtained by superimposing the porous metal foil 22 described above on the nonwoven fabric layer 21 described above. Specifically, as shown in the top diagrams of FIGS. 1A and 1C, the acoustic interference structure 12 may have a structure in which two unit laminates 20 are stacked. As shown in the middle view of (c), the unit laminate 20 may be stacked in three layers, or as shown in the bottom view of FIG. 1 (c), four layers of the unit laminate 20 are stacked. The configuration may be a configuration in which five or more layers are stacked.
As shown in FIG. 1A, most of the thickness of the sound absorbing panel 10A is the sound wave interference structure 12. In other words, the number of the unit laminated bodies 20 constituting the sound wave interference structure 12 is changed. Thus, it is possible to adjust the thickness of the sound absorbing panel 10A. In addition, as will be described later, by changing the number of unit laminates 20 to be stacked, it is possible to absorb sound waves in different frequency ranges, and accordingly, according to the frequency characteristics of the sound waves to be absorbed, The number can also be set to a preferred value.
Although the arrangement direction of the sound wave interference structure 12 in the sound absorbing panel 10A is not particularly limited, as shown in FIG. 1A, the outermost porous metal foil 22 is located on the front side (the sound wave absorbing plate 11 side). In addition, the sound wave interference structure 12 is preferably disposed between the sound wave absorption plate 11 and the reflection plate 13. As a result, the nonwoven fabric layer 21 can be protected by the porous metal foil 22, so that, for example, even if a water droplet or the like as described above adheres to the surface (the sound absorbing plate 11), the water droplet And the like are less likely to enter the sound absorbing panel 10 </ b> A, thereby suppressing a decrease in sound absorbing performance.

The reflector 13 is arranged on the back side of the sound absorbing panel 10A and is configured to reflect sound waves transmitted from the front side. The specific configuration of the reflection plate 13 is not particularly limited, and the reflection surface (the surface that is the inner side of the sound absorption panel 10 </ b> A) retransmits the sound wave that has propagated through the sound absorption plate 11 and the sound wave interference structure 12. What is necessary is just to be comprised so that it may reflect toward the structure 12. FIG. Usually, it should just be a smooth surface, but from the viewpoint of stabilizing the shape of the sound-absorbing panel 10A, it should be as rigid as the sound-absorbing plate 11. The thickness of the reflector 13 is not particularly limited, and a suitable thickness can be set according to various conditions.
As described above, the mold frame 14 holds its periphery in a state where the sound wave absorbing plate 11, the sound wave interference structure 12, and the reflecting plate 13 are overlapped, and moves forward and backward with the sound wave absorbing plate 11 facing the front side. Any configuration may be used as long as it is freely supported, and the specific configuration is not particularly limited. In this embodiment, as shown in FIGS. 1 (a) and 1 (c), the periphery of the state in which the sound wave absorbing plate 11, the sound wave interference structure 12 and the reflecting plate 13 are superposed can be inserted. It is comprised as a frame which has a space | interval.
Furthermore, in this Embodiment, it is preferable that the outer periphery of the formwork 14 is comprised so that attachment of the fixing member for attaching the sound absorption panels 10A to each other or attaching the sound absorption panels 10A to installation object is possible. Specifically, in the present embodiment, as shown in FIGS. 1A and 1C, a columnar coupling portion 15 having a cross-sectional area equivalent to that of the main body of the mold 14 is provided.
Thus, for example, as shown in FIG. 2A, a bolt 31 and a nut 32 and a pair of coupling plates 33 are used as fixing members, and both sides of the coupling portion 15 are sandwiched between the coupling plates 33. By attaching the bolt 31 and the nut 32 so as to penetrate the coupling portion 15, the sound absorbing panels 10A can be coupled on the same plane. Further, as shown in FIG. 2B, the other sound absorbing panel 10A is arranged so as to form a right angle with respect to one sound absorbing panel 10A, and the coupling portions 15 are brought into contact with each other, so that the other sound absorbing panel 10A. The sound absorbing panels 10A can be coupled to each other at right angles by passing the bolts 31 so as to reach the coupling part 15 of one sound absorbing panel 10A from the side surface of the coupling part 15.
Note that the fixing member used is not limited to the bolt 31, the nut 32, the coupling plate 33, and the like, and may be another known fixing member depending on the use condition of the sound absorbing panel 10A, the attachment target, and the like. Can be used.
Here, the materials of the sound wave absorbing plate 11, the reflecting plate 13, and the mold 14 constituting the sound absorbing panel 10A are not particularly limited, but in the present embodiment, light metal materials can be preferably used. If these are made of light metal, not only good sound absorption performance can be realized, but also good rigidity, durability and the like can be realized. Specific examples of the light metal include aluminum, magnesium, titanium, and alloys thereof as with the porous metal foil 22 described above. Aluminum or an alloy thereof is preferable for the same reason as the porous metal foil 22. Can be used.

[Modification]
In addition, the sound absorbing panel according to the present invention is not limited to the configuration shown in FIG. 1A or the like, and if the configuration includes the sound wave absorbing plate 11, the sound wave interference structure 12, the reflecting plate 13, and the formwork 14, Other configurations can be employed. Specifically, for example, as shown in FIG. 2C, a sound absorbing panel 10B having a configuration in which the reflecting plate 13 is integrated with a mold can be mentioned. The reflector-integrated frame 16 used in the sound-absorbing panel 10B is configured as shown in FIG. 1A except that the sound-absorbing plate 11, the sound-wave interference structure 12 and the reflector 13 are accommodated therein. The sound absorbing panel 10A shown in FIG.
Here, in the sound absorbing panel 10 </ b> B, the back surface portion (back surface side portion) of the reflector integrated frame 16 is the reflecting plate 13, and the sound wave propagated through the sound absorbing plate 11 and the sound wave interference structure 12 is transmitted. It is configured to reflect again toward the sound wave interference structure 12. Further, both ends of the reflector-integrated mold 16 hold the periphery of the sound absorbing plate 11, the sound wave interference structure 12, and the reflecting plate 13 as in the case of the mold 14 of the sound absorbing panel 10A. Holds freely moving forward and backward.
Also in this type of sound absorbing panel 10B, the reflector-integrated frame 16 may be made of a light metal such as aluminum. However, as will be described later, the sound absorbing panel 10B can be used as an interior such as a panel curtain or a vertical blind. It is. Therefore, a thin layer of light metal of aluminum may be laminated only on the inner surface side which is formed of a known plastic (resin) molded product and becomes the reflection plate 13 in order to improve the sound wave reflection performance.
Therefore, in the present invention, the configuration excluding the sound wave interference structure 12 does not necessarily need to be formed of light metal, and other materials such as plastic and light metal are used depending on the use of the sound absorbing panel 10A or 10B. A combined composite material may be used, or it may be formed of only materials other than light metals.
Further, when the sound absorbing panel 10B is used for interior, in the reflector integrated frame 16, R processing is applied to the edge of the frame portion that holds the sound absorbing plate 11, the sound wave interference structure 12, and the reflecting plate 13. May be. Accordingly, when a plurality of sound absorbing panels 10B such as curtains and blinds are used in a movable state, the edge of the frame portion can be reduced from being caught by other sound absorbing panels 10B, so that the sound absorbing panel 10B can be handled easily. Can be improved.

[Examples and effects]
Hereinafter, the present invention will be described in more detail with reference to typical examples of the present invention. 3A to 3C, the sound absorbing plate 11, the reflecting plate 13 and the mold 14 constituting the sound absorbing panel 10A are all made of aluminum, and the sound interference structure 12 is 2 What consisted of -4 sets of unit laminated bodies 20 was used. This unit laminated body 20 was obtained by superposing a porous metal foil 22 made of aluminum foil on a non-woven fabric layer 21 of a dry nonwoven fabric (Karu (registered trademark), manufactured by Maeda Kosen Co., Ltd.) of a commercially available heat and flame resistant fiber. Is.
As shown in FIG. 3A, in the sound absorbing panel 10A (see the top diagram in FIG. 1C) in which the sound wave interference structure 12 is composed of two sets of unit laminates 20, the original sound in the figure is 86. It was 68.8 dB after absorption in the lower part of the figure whereas it was .9 dB, and 18.1 dB sound absorption was confirmed. As a result, it has been clarified that if the sound wave interference structure 12 is composed of at least two sets of unit laminated bodies 20, sufficiently excellent sound absorbing performance can be exhibited.
In addition, as shown in FIG. 3B, in the sound absorbing panel 10A (see the intermediate diagram in FIG. 1C) in which the sound wave interference structure 12 is composed of three sets of unit laminated bodies 20, the original sound in the figure Was 66.8 dB after absorption in the lower part of the figure, and a sound absorption of 20.4 dB was confirmed. As a result, it was revealed that further excellent sound absorption performance can be exhibited by increasing the number of unit laminate bodies 20 by one set.
In addition, as shown in FIG. 3C, in the sound absorbing panel 10A (see the lowermost diagram in FIG. 1C) in which the sound wave interference structure 12 is composed of four sets of unit laminates 20, the original sound in the upper part of the drawing. Was 66.9 dB after absorption in the lower part of the figure, and 20.8 dB of sound absorption was confirmed. Furthermore, when compared with the case of 3 sets shown in FIG. 3B, it was revealed that the sound waves in the low frequency range were particularly well absorbed when the number of unit laminated bodies 20 was 4. Thereby, it became clear that the sound wave of a different frequency range can be absorbed by changing the number which the unit laminated body 20 overlaps.
In the sound absorbing panel 10A or 10B having such a configuration, if the sound absorbing surface A of these sound absorbing panels 10A and 10B is installed facing the sound source, sound waves from the sound source are first propagated to the sound absorbing plate 11. Since the sound wave absorbing plate 11 vibrates due to the propagated sound wave, the sound wave is absorbed and absorbed to some extent. Next, the sound wave transmitted through the sound absorbing plate 11 propagates to the porous metal foil 22 of the sound wave interference structure 12, attenuates by the pores 23 of the porous metal foil 22, and propagates to the nonwoven fabric layer 21. In the nonwoven fabric layer 21, sound waves are dispersed and attenuated due to interference.
Here, the unit laminated body 20 composed of the porous metal foil 22 and the nonwoven fabric layer 21 is one set, and two or more unit laminates are superposed to form the sound wave interference structure 12. The sound wave propagated through the body 20 is greatly attenuated. Furthermore, since the sound wave that has passed through the sound wave interference structure 12 is reflected by the reflector 13 and propagates again to the sound wave interference structure 12, the sound wave is further attenuated. Thereby, the sound absorbing panels 10A and 10B can exhibit very excellent sound absorbing performance.
Moreover, since the sound wave interference structure 12 is composed of the porous metal foil 22 and the nonwoven fabric layer 21, the thickness thereof is smaller than that of the conventional structure. Therefore, the thickness of the sound absorbing panels 10A and 10B can be significantly reduced as compared with the conventional case. In addition, since the sound wave interference structure 12 has a configuration in which two or more unit laminate bodies 20 in which the porous metal foil 22 and the nonwoven fabric layer 21 are overlaid are overlapped, the sound absorption is increased by increasing or decreasing the unit laminate body 20. The thickness of the panels 10A and 10B can be adjusted, and by increasing or decreasing the number of unit laminates 20, the sound wave absorption performance in a specific frequency region can be improved.

[Example of use]
The usage pattern of the sound absorbing panel according to the present invention is not particularly limited, and can be suitably used in various usage patterns in various applications where soundproofing is required. Specifically, for example, a soundproof box 51 shown in FIG. 4A, a partition 52 shown in FIG. 4B, a ceiling panel 53 shown in FIG. 4C, a panel curtain 54 shown in FIG. Further, the vertical blind 55 shown in FIG.
As shown in FIG. 4A, the soundproof box 51 is formed by connecting a plurality of sound absorbing panels 10A in a box shape as shown in FIGS. 2A and 2B using the fixing members described above. It can be formed. This soundproof box 51 can be used in the form of storing a relatively small device used in a home or office. Examples of such devices include various household medical devices and servers.
Further, in the configuration shown in FIG. 4B, the partition 52 is provided with a leg body at the lower portion thereof in order to use the sound absorbing panel 10A upright, but the leg body can be moved by attaching a wheel to the leg body. It is good also as a simple structure.
The ceiling panel 53 has a configuration in which a plurality of sound absorbing panels 10A are attached to a ceiling 60 indicated by a dotted line in FIG. Similarly, although not shown, the sound absorbing panel 10A may be affixed to an office or indoor wall.
Moreover, since the sound absorbing panels 10A and 10B according to the present invention are thin and light, they can be suitably used as the panel curtain 54 shown in FIG. . Furthermore, the sound absorbing panels 10A and 10B are configured to be vertically longer than general panels, and are configured to move in conjunction with hanging from the curtain rail, so that the vertical blind 55 shown in FIG. Can be used.
These panel curtains 54 and vertical blinds 55 can achieve both light-shielding performance and sound-absorbing performance satisfactorily when they are closed, so it is possible to hold a conference using a projector or the like in an office, or indoors. It can be suitably used for applications such as a home theater. In addition, by changing the shape of the sound absorbing panels 10 </ b> A and 10 </ b> B or changing the material, the sound absorbing panels 10 </ b> A and 10 </ b> B can be suitably used for various interiors used in the room other than the panel curtain 54 and the vertical blind 55.
Further, although not shown, the sound absorbing panels 10A and 10B are thin and lightweight, so that they can be suitably used in the interior of vehicles such as ships, automobiles, railway vehicles, and aircraft. These various vehicles are required to be as light as possible due to recent demands for improvement in fuel consumption. Therefore, no importance has been placed on soundproofing that may impede weight reduction, but the sound absorbing panel 10A according to the present invention. , 10B is thin and lightweight, so that a soundproof room or the like can be provided in the vehicle without significantly affecting the weight reduction. The sound absorbing panels 10A and 10B in the vehicle may be provided as inner walls of the vehicle, or may be provided as interiors such as curtains and blinds as shown in FIGS. 4 (d) and 4 (e).
It should be noted that the present invention is not limited to the description of the above-described embodiment, and various modifications are possible within the scope shown in the scope of the claims, and are disclosed in different embodiments and a plurality of modifications. Embodiments obtained by appropriately combining the technical means are also included in the technical scope of the present invention.

  The present invention can be suitably used in various fields where soundproofing is required.

10A, 10B Sound absorbing panel 11 Sound absorbing plate 12 Sound interference structure 13 Reflecting plate 14 Form 15 Joint 15 Reflecting plate integrated frame 20 Unit laminated body 21 Non-woven fabric layer 22 Porous metal foil 51 Soundproof box 52 Partition 53 Ceiling panel 54 Panel curtain 55 Vertical blind

Claims (8)

A sound-absorbing plate that is arranged on the front side and absorbs sound waves and transmits them inside;
A reflector disposed on the back side and reflecting the sound waves transmitted from the front side;
A sound wave interference structure that is disposed between the sound wave absorbing plate and the reflection plate and causes the sound wave to interfere and attenuate;
A mold for holding the sound absorbing plate, the sound wave interference structure, and the reflection plate in a state where they are overlapped, and supporting the sound absorbing plate toward the front side so as to freely move forward and backward. ,
The acoustic interference structure is
It is configured as two or more unit laminates composed of a nonwoven fabric layer and a porous metal foil superimposed on the nonwoven fabric layer,
Sound absorbing panel. The acoustic interference structure is
The outermost layer of the porous metal foil is disposed on the front side, and is disposed between the sound absorbing plate and the reflecting plate,
The sound-absorbing panel according to claim 1. The nonwoven fabric layer is a dry nonwoven fabric made of organic fibers or carbon fibers,
The sound absorption panel according to claim 1 or 2. The non-woven fabric layer is a dry non-woven fabric made of carbon-based fibers obtained by heat- and flame-proofing acrylic fibers,
The sound absorbing panel according to claim 3. The porous metal foil is a light metal foil having pores formed on the entire surface,
The sound-absorbing panel according to any one of claims 1 to 4. The sound wave absorbing plate is a net-like plate having rigidity,
The holes serving as meshes are formed in a direction inclined with respect to the normal direction of the sound wave absorbing plate,
The sound absorbing panel according to any one of claims 1 to 5. The sound wave absorbing plate, the reflecting plate, and the mold are made of light metal,
The sound-absorbing panel according to claim 6. The reflector is integrated with the mold,
The sound-absorbing panel according to claim 1.

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