JP3072238B2 - Sound absorbing curtain, sound absorbing curtain structure, and sound absorbing panel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound-absorbing curtain which has excellent sound-absorbing characteristics, and which can be suspended (mounted) from a ceiling or the like so that winding and folding can be easily carried out. Also, the present invention relates to a sound absorbing curtain structure and a sound absorbing panel using the sound absorbing curtain.

[0002]

2. Description of the Related Art Conventionally, various types of porous materials such as glass wool, metal fibers, and metal sintered materials are mainly used as sound absorbing materials, and are used as panels which are mounted on a wall or the like. . Therefore, these conventional sound-absorbing materials require processing costs for paneling in addition to the cost of the sound-absorbing materials themselves, resulting in extremely high costs.

[0003] In addition to the flat space, the sound absorbing material
It is also necessary to attach it to parts where piping and wiring are complicated, such as in factories and ships, as well as curved parts and parts with complicated shapes. However, it is difficult to install a conventional panel-shaped sound absorbing material in a position where such a sufficient space cannot be secured in a good state, which increases the cost for mounting and requires further processing of the sound absorbing material. There can be. In addition, a predetermined sound absorbing characteristic cannot be obtained in many cases depending on the state of attachment.

Further, in a music room such as a piano room or a music listening room, a gymnasium, or the like, it is preferable to attach a sound absorbing material to doors, windows, and the like. However, in a conventional panel-shaped sound absorbing material,
It is difficult to attach or detach the window, and if a sound absorbing material is incorporated into a window or the like and fixed, the window becomes unusable.

Therefore, processing such as paneling is not required; it can be easily installed even in a complicated place or a place having a complicated shape, and a desired sound absorbing property can be exhibited; storage can be made easily by folding or winding. There is a demand for a curtain-shaped sound-absorbing material (sound-absorbing curtain) that can easily and easily be used for windows and the like. However, a sound absorbing curtain having good sound absorbing characteristics and sufficient performance for practical use has not yet been realized.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art, and has excellent sound absorbing characteristics, and can be installed hanging from a ceiling or the like.
It is easy to use in complicated places and places with complicated shapes,
Moreover, it is an object of the present invention to provide a sound absorbing curtain capable of easily storing such as winding and folding, and a sound absorbing curtain structure and a sound absorbing panel using the sound absorbing curtain.

[0007]

Means for Solving the Problems In order to achieve the above object, the present inventors have made intensive studies, and as a result, have accomplished the present invention by obtaining the following findings.

Hitherto, it has been known that a small sound absorbing effect is exerted by causing a film vibration of a thin film such as a vinyl sheet or an aluminum foil, that is, a vibration on a smooth surface. Although it is possible to produce a sound-absorbing material by utilizing this, the sound-absorbing effect obtained by using the vibration of the smooth surface (membrane vibration) is very low, and the sound-absorbing coefficient is 0.1 to an average. It is about 0.2 (10 to 20%).

On the other hand, the present inventor has made intensive studies, and as a result, has realized an excellent film vibration and sound absorbing material by sandwiching a resin thin film between plate-like bodies having a large number of openings, such as expanded metal and punched metal. They have found that they can do this and have previously proposed this in Japanese Patent Application No. 5-20227. In this sound-absorbing material, a sound absorbing action is caused by the vibration of the resin thin film by the action of a sound wave (vibrating air) impinging on the resin thin film surface; the sound wave incident on the resin thin film flows along the thin film surface, and the viscous action of the flow of the sound wave Sound absorption effect by;
Due to the vibration of the resin thin film, the resin thin film hits the punching metal, and absorbs the energy of vibration and sound.

Japanese Patent Publication No. 5-29920 discloses that
As a sound-absorbing material using membrane vibration, a thin-film is applied to the thin film using a lattice-like wooden frame, etc. There is disclosed a sound absorbing method in which sound waves having different phases are emitted from each thin film to absorb sound by mutual interference of sound waves.

Further, according to the study of the present inventor, if a metal (resin) thin film having a broken portion is sandwiched between expanded metals and the metal thin film at the broken portion can be vibrated by sound waves, the film at the broken portion is formed. Prior to Japanese Patent Application Laid-Open No. Heisei 4-
No. 18,600, and the like.

That is, in the prior art, in order to realize a sound-absorbing material having sufficient sound-absorbing characteristics by utilizing the membrane vibration of a thin film which can be expected to be used for a sound-absorbing curtain, it is necessary to use a punching metal, a grid-like frame, or the like. The support of the thin film by the rigid body was considered to be indispensable. However, in these methods, the result is a panel-shaped sound absorbing material similar to the conventional one, and a sound absorbing curtain having various advantages such as being windable and easy to install is realized. I can't.

On the other hand, the inventor of the present invention has conducted intensive studies to realize a sound absorbing curtain having sufficient sound absorbing characteristics. As a result, a metal thin film or a resin thin film having a broken portion and a flexible net-like sheet ( Screen mesh) and make the thin film at the broken portion vibrate, whereby a good sound absorbing effect can be obtained without supporting the thin film with a rigid body. By having the above-described configuration, it has been found that a sound absorbing curtain having excellent sound absorbing properties can be realized by exhibiting a good sound absorbing effect by vibrating the thin film at the broken portion very finely by the incidence of sound waves, and The sound absorbing curtain and the sound absorbing curtain structure of the invention have been achieved.

Further, the present inventor has found that by using the above-described sound absorbing curtain of the present invention, a light-weight, inexpensive panel-shaped sound absorbing material having excellent sound absorbing characteristics can be realized, and the sound absorbing panel of the present invention has been developed. It came to be.

That is, the sound-absorbing curtain of the present invention is obtained by adhering a flexible net-like sheet and a thin film having a large number of broken portions, and the thin film at the broken portion can be vibrated by sound waves. A sound-absorbing curtain is provided.

Preferably, a cloth is further laminated on at least one surface of the sound absorbing curtain.

Further, it is preferable that the sound absorbing curtain is formed in a wave shape.

The sound-absorbing curtain structure of the present invention is characterized in that one or a plurality of the above-described sound-absorbing curtains of the present invention are arranged with a gap therebetween and an air layer is provided on a wall surface. Provide body.

Further, a first aspect of the sound-absorbing panel of the present invention provides a sound-absorbing panel characterized in that the sound-absorbing curtain of the present invention is arranged on one or both sides of a panel material.

Further, in the first aspect of the sound absorbing panel of the present invention, the sound absorbing curtain is formed in an elastic bellows shape, and the panel members are arranged in a direction in which the bellows expands and contracts and are connected to each other so as to be refractible. It is preferable to be composed of a plurality of plate members.

According to a second aspect of the sound absorbing panel of the present invention, the sound absorbing panel includes a plurality of the sound absorbing curtains of the present invention and a frame for fixing the sound absorbing curtains. A sound-absorbing panel which is fixed at intervals and at least one sound-absorbing curtain is arranged at an angle with respect to other sound-absorbing curtains.

Further, in the second aspect of the sound absorbing panel of the present invention, it is preferable that the sound absorbing curtain disposed at the angle has a bending portion.

Further, in the second aspect of the sound absorbing panel of the present invention, an aluminum-based expanded metal and an areal density of 500 g / m ² are further provided on the sound incident side surface of the sound absorbing panel.
A porous metal material obtained by pressing a laminate with an aluminum-based metal fiber layer of up to 3000 g / m ² may be arranged.

Hereinafter, the sound absorbing curtain of the present invention, the sound absorbing curtain structure and the sound absorbing panel of the present invention utilizing the sound absorbing curtain will be described in detail.

FIG. 1 and FIG. 2B are conceptual diagrams of an example of the sound absorbing curtain of the present invention. FIG. 1 is an exploded view (front view) of the sound absorbing curtain of the present invention viewed from the surface direction (front) of the sheet, and FIG.
FIG. 3 is a partially enlarged view of a cross section viewed in a direction perpendicular to FIG. The illustrated sound absorbing curtain 10 of the present invention has a configuration in which a thin film sheet 14 having a break portion 12 and a flexible net-like sheet (flexible screen mesh) 16 are adhered. Here, in the sound absorbing curtain 10 of the present invention, the thin film sheet 14 of the break portion 12 (hereinafter, this portion is referred to as a break portion 14a) can be vibrated by a sound wave.

As described above, the resin thin film and the metal thin film vibrate by the incidence of sound waves to exhibit a sound absorbing effect. However, the sound absorbing effect obtained by utilizing the smooth surface vibration (film vibration) is very low. The average sound absorption is 0.1-0.2 (10-20%)
Therefore, it cannot be practically used as a sound absorbing material. On the other hand, in the sound-absorbing curtain 10 of the present invention, the thin film sheet 14 having the breakable portion 14a vibrated by the sound wave and the net-like sheet 16 are entirely adhered to each other, so that the breakage portion 14a is good due to the incidence of the sound wave. It can vibrate very finely to absorb sound energy well, and exhibits excellent sound absorption characteristics, which will be described in detail in the following examples.

Moreover, such a sound absorbing curtain of the present invention has good flexibility due to its structure, and can be easily used in a complicated place or a place having a complicated shape. The sheet can be easily stored by a known storage method such as a curtain. Therefore, it is difficult to use conventional panel-shaped sound-absorbing materials, such as intricate parts such as pipes and wiring in factories and ships, curved parts and complicated shapes, and windows in piano rooms. It is suitably used for certain applications. In addition, since only the thin film sheet 14 and the mesh sheet 16 are used, a lightweight and inexpensive sound absorbing curtain (sound absorbing material) can be realized.

The material of the thin film sheet 14 used for the sound-absorbing curtain 10 of the present invention is not particularly limited, and various metal thin films, vinyl thin films, polyethylene thin films, polypropylene thin films, ethylene fluoride thin films, and polyvinylidene thin films are used. Any of various known resin thin films such as a system-based thin film and an acrylic-based thin film can be applied, but in terms of sound absorption characteristics, weather resistance, durability, etc., metal thin films, ethylene fluoride-based thin films, and polyvinylidene-based thin films are used. It is particularly preferably used.

As the ethylene-based resin used for the ethylene-based thin film, various known resins can be exemplified, but ethylene tetrafluoride (PTFE) and ethylene tetrafluoride-6
Fluorinated propylene copolymer, tetrafluoroethylene / polyethylene copolymer (ETFE), trifluorinated ethylene chloride (PCT)
FE) and the like are preferably exemplified. These fluorinated ethylene resins are nonflammable and have excellent chemical resistance, weather resistance and heat resistance. As the polyvinylidene-based resin used as the polyvinylidene-based thin film, various known resins are exemplified, and preferred examples thereof include vinylidene difluoride (PVDF) and vinylidene cyanide. These vinylidene resins are excellent in chemical resistance and weather resistance. As the metal thin film, a so-called aluminum foil is preferably used in terms of weight, corrosion resistance, and the like.

The thickness of the thin film sheet 14 is not particularly limited, and may be any thickness as long as the broken portion 14a can vibrate by sound waves according to the physical properties of the material. For example, the thin film sheet 14
Is a resin thin film, the thickness of the thin film sheet 14 is preferably 6 μm or more in order to exhibit good sound absorbing properties.
It is about 30 μm, more preferably about 6 to 15 μm. When the thin film sheet 14 is a metal thin film such as an aluminum foil, the thickness of the thin film sheet 14 is preferably about 5 μm to 10 μm, and more preferably about 7 μm to 9 μm.

The material of the net-like sheet 16 used for the sound-absorbing curtain 10 of the present invention is not particularly limited, and has a good flat shape without waving when it is hung, and a degree that can be easily wound. As long as the material has the above flexibility, a mesh sheet (screen mesh) made of various materials can be used. Specifically, a screen mesh formed from the material for forming the thin film sheet 14 described above,
A mesh-like woven fabric woven with various fibers such as glass fiber, carbon fiber, and resin fiber is preferably exemplified.

The thickness of the net-like sheet 16 is not particularly limited, and may be any thickness depending on the material, form and the like of the net-like sheet 16 as long as it is a good plane when suspended. Further, the aperture ratio (mesh size) of the mesh sheet 16 is not particularly limited, but is required to be 10 to 3 in order to exhibit good sound absorption characteristics.
It is preferably about 0 mesh (opening: 2 mm to 0.59 mm), preferably about 14 to 25 mesh (opening: 1.41 mm to 0.71 mm).

In the sound absorbing curtain 10 of the present invention, such a thin film sheet 14 and / or a net-like sheet 16 may be formed by directly superposing two or more thin-film sheets 14 or a net-like sheet 16 if necessary. ,Also,
The structure which has two or more superimposing units of the thin film sheet 14 and the net-like sheet 16 may be sufficient.

The sound absorbing curtain 10 according to the present invention has the following features.
After attaching the thin film sheet 14 and the net-like sheet 16 as shown in FIG. 2 (a), as shown in FIG.
Or by forming a break 1 in advance.
2 can be manufactured by sticking the thin film sheet 14 and the net-like sheet 16 on each other. Thin film sheet 1
There is no particular limitation on the method of sticking 4 and the net-like sheet 16,
Various methods are exemplified, such as a method using an adhesive material corresponding to both forming materials, and a method of fusing by heat without crushing the mesh or the broken portion 14a.

There is no particular limitation on the method of forming the break portion 12, and the thin film sheet 14 (or the bonded body to the net-like sheet 16) is transported by using a roller on which a protrusion corresponding to the break portion 12 is formed. Cut by cutting 1
2, the thin film sheet 14 (or the net-like sheet 1) is formed by a press machine in which projections corresponding to the fractured portions 12 are formed.
6, a method of forming a cut portion 12 by making a cut by pressing the bonded body 6 or the like can be used. What is important here is that when forming the break portion 12, the break portion 14a is left as much as possible. As the number of broken portions 14a increases, the sound absorbing curtain 10 of the present invention exhibits better sound absorbing characteristics.

The size and shape of the break portion 12 and the formation density (interval) are not particularly limited, and may be appropriately determined according to the mesh size of the mesh sheet 16 and the like. In addition, the break 12
May be regular or irregular. The size of the break portion 12 is not particularly limited, but is preferably about 0.1 mm to 1 cm. By setting the size, a favorable result can be obtained in terms of sound absorption characteristics and the like. Further, in order to obtain good sound absorption characteristics, the breaking portion 1
It is preferable that the formation density of 2 (fracture portion 14a) be high (that is, the number of fracture portions 14a is large).

In such a sound absorbing curtain 10 of the present invention, if necessary, a cloth material is laminated on the thin film sheet 14 or net-like sheet 16 side, preferably on both sides of the sound absorbing curtain 10 of the present invention. May be. With such a configuration, it is possible to improve the sound absorbing properties, particularly, the sound absorbing properties in a low frequency region, which will be described in detail in the following examples. By providing such a material, it is possible to use it more favorably as a decorative material, a curtain for a general household, a blackout curtain for a theater, a gym, a concert hall, and the like. In addition, non-combustible glass cloth is also preferably used in terms of disaster prevention. When the cloth material is laminated on only one surface of the sound absorbing curtain 10, the cloth material may be laminated on any surface.

The cloth material used is not particularly limited, and various known woven fabrics and non-woven fabrics can all be used.
Multiple sheets may be used. Furthermore, as cloth material, color,
It is as described above that a decorative material may be imparted by using a pattern or pattern.

The method of manufacturing the sound absorbing curtain of the present invention in which the cloth material is laminated is not particularly limited. After the cloth material is disposed on one or both surfaces of the sound absorbing curtain 10, an appropriate position of the end is bonded or stitched. Various methods can be used, such as a method of fixing by means of a method, a method of bonding or stitching one side or a plurality of sides (at least a part of an edge) of the laminate. When manufacturing the embodiment in which the cloth materials are laminated, the cloth material and the thin film sheet 14 or the net-like sheet 16 may be laminated and fixed first, and then the rest may be adhered. Also, in terms of strength and the like,
If necessary, not only the ends but also the inside may be adhered or stitched. What is important is that the fixing of the cloth material does not disturb the vibration of the broken portion 14a, and therefore, a point or linear fixing is preferable to a planar fixing.

The sound-absorbing curtain 10 of the present invention (or the sound-absorbing curtain obtained by laminating the cloth material) exhibits good sound-absorbing characteristics even when it is in a flat shape, but is preferably wavy (bellows-like) like a normal curtain. (See FIG. 9), more excellent sound absorption characteristics can be exhibited. There is no limitation on the method of shaping the sound absorbing curtain 10 and the like,
Fabrics and sheet materials can be wavy, such as a method of forming a wavy shape by adding a fold to a sound absorbing curtain, a method of forming a wavy shape by attaching seams to a sound absorbing curtain, a method of making a wavy shape when hanging using members such as rails, etc. All known methods of shaping are available.

The height and pitch (distance between the peaks) of the wave when the sound absorbing curtain of the present invention is formed in a wave shape are not particularly limited, and the size, flexibility, installation location and the like of the sound absorbing curtain are not limited. The wave height is 20 to 80 mm and the pitch is 60 to 180 mm in terms of sound absorption characteristics and the like.
It is preferable to set the degree.

The sound absorbing curtain structure of the present invention includes the sound absorbing curtain 10 of the present invention (including an embodiment in which cloth materials are laminated and an embodiment formed in a wavy shape).
0) or a plurality of sheets with a gap, and an air layer provided on a wall surface (sound insulation material). As described above, the sound absorbing curtain structure of the present invention in which one sound absorbing curtain 10 of the present invention is disposed with an air layer provided on the wall surface 20 as shown in FIG. Express characteristics.

As shown in FIG. 3 (b), a sound absorbing curtain structure of the present invention in which a plurality of sound absorbing curtains are provided with a gap therebetween and an air layer is provided on the wall surface 20 is shown in FIG. As schematically shown, the sound waves that have passed through the first sound absorbing curtain are absorbed by the subsequently arranged sound absorbing curtain,
In addition, sound waves reflected by the wall surface 20 can be similarly absorbed by a plurality of sound absorbing curtains, and very good sound absorbing characteristics can be exhibited. In this case, by using a plurality of sound absorbing curtains having different characteristics in combination, it is possible to realize a sound absorbing material in which the characteristics of each sound absorbing curtain are mixed and exhibit good sound absorbing characteristics over a wide frequency range.

In the illustrated example, two sound absorbing curtains of the present invention are arranged, but the sound absorbing structure of the present invention is not limited to this, and three or more sound absorbing curtains are arranged. Is also good. In addition to the above-described embodiment in which one sound absorbing curtain of the present invention is used, it can be used in combination with a conventional panel-shaped sound absorbing material.

As will be described later in detail, in the sound-absorbing curtain structure of the present invention, the sound-absorbing characteristics obtained by the size of the back air layer, the distance between the sound-absorbing curtain and the wall surface, and the distance between the respective sound-absorbing curtains. (A frequency band having good sound absorption characteristics) can be adjusted, so that the arrangement position of the sound absorbing curtain may be appropriately determined according to the frequency band targeted for sound absorption. In the sound absorbing curtain structure of the present invention, the size of the air layer (the distance between the sound absorbing curtain 10 and the wall surface 20) when one sound absorbing curtain 10 is arranged is not particularly limited, and is the same as that of a normal sound absorbing material. , But usually
It is about 50 to 150 mm, preferably about 60 to 120 mm. Further, in an embodiment in which a plurality of sound absorbing curtains are used, the distance between the sound absorbing curtains 10 (and the distance between the wall surface 20 and the sound absorbing curtain 10 closest thereto) differs depending on the frequency of the sound absorbing purpose, but is 10 to 140 mm. The sound absorbing curtains may be arranged so as to be about 30 mm, preferably about 30 mm to 60 mm. The intervals between the sound absorbing curtains may be the same or different.

In such a sound absorbing curtain structure of the present invention, the sound absorbing curtain 10 or the like of the present invention is provided with an air layer on the wall surface 20 and fixed directly to the ceiling 22 or fixed to a beam for fixing the sound absorbing curtain. The sound-absorbing curtain of the present invention can be fixed and suspended from above. Further, the sound absorbing curtain 10 of the present invention may be attached to the wall surface 20 by using a curtain rail or the like like a normal curtain to configure the sound absorbing curtain structure of the present invention. The method of fixing the sound absorbing curtain to the ceiling 22 or the like is not particularly limited, and any known fixing method (suspension method) of a sheet-like material can be used.

In the sound-absorbing curtain structure of the present invention, the lower end of the sound-absorbing curtain may be fixed if necessary, or the sound-absorbing curtain may be wound or folded by a known sheet-like storage method. May be configured to be stowable. Further, in an embodiment having a plurality of sound absorbing curtains, a holding member for keeping the lower end of each curtain at a predetermined interval may be provided.

In the sound absorbing curtain structure of the present invention,
A sound absorbing curtain structure as shown in FIG. 3B may be configured by combining the sound absorbing curtain of the present invention with a conventional panel-shaped sound absorbing material. As the panel-shaped sound absorbing material, any of known sound absorbing materials such as a porous material such as a normal metal sintered material can be used.
Utilizing a metal porous material obtained by pressing a laminate of an aluminum (Al) -based expanded metal and an Al-based metal fiber layer disclosed in Japanese Patent Publication No. 2 (1994) -1995, a sound-absorbing curtain structure having extremely excellent sound-absorbing characteristics can be obtained. Can be realized. Here, this metal porous material exhibits better sound absorbing characteristics as the surface density of the Al-based metal fiber is higher. However, in the present invention, since it is combined with the sound absorbing curtain of the present invention, about 550 g / m ² Even if a metal porous material using an Al-based metal fiber layer having a low areal density is used, good sound absorption characteristics can be exhibited. Therefore, an inexpensive structure using a small amount of the expensive Al-based metal fiber layer can be obtained. The porous metal material will be described later in detail.

The sound-absorbing panel of the present invention is provided on one or both sides of a known panel material by using the above-described sound-absorbing curtain 10 of the present invention.
Is arranged.

As the panel material used for the sound-absorbing panel of the present invention, all known plate-like rigid bodies can be used.
Specifically, metal plate, resin plate, wood plate, concrete plate,
Examples include a glass plate and a porous material panel such as a metal sintered material. Further, the sound absorbing curtain of the present invention may be arranged in contact with the panel material, or may be non-contact. The method for manufacturing the sound-absorbing panel of the present invention is not particularly limited, and a method for fixing the sound-absorbing curtain of the present invention to the panel material using a jig, a fixing member, an adhesive, etc., and disposing a holding member such as a rail on the panel material. Various known methods for fixing the sheet-like material to the panel material, such as a method for fixing (suspending) the sound absorbing curtain of the present invention to the holding member, can be used. When fixing the sound-absorbing curtain to the panel material, as in the case of laminating the cloth material described above, it is preferable to fix the sound absorbing curtain in a point or line shape rather than in the planar shape. The sound-absorbing panel of the present invention may be fixedly provided at the installation location, like a conventional sound-absorbing material, or may be provided with legs or the like and used as a so-called partition. Furthermore, in the sound-absorbing panel of the present invention, the sound-absorbing curtain may be housed by winding or folding.

As described above, the sound-absorbing curtain of the present invention can be freely folded, rolled up, shaped, etc., like a normal cloth material. Therefore, in the sound-absorbing panel of the present invention, the sound-absorbing curtain of the present invention is formed in an elastic bellows shape, and the panel material is composed of a plurality of plate-shaped members arranged in the direction of expansion and contraction of the bellows and connected to each other so as to be freely bent. Thereby, a sound absorbing panel which can be opened and closed (hereinafter, referred to as an openable sound absorbing panel for convenience) may be configured to be folded and stretched like a so-called accordion curtain (accordion door = folding door). FIG. 5 is a schematic perspective view of such an openable sound absorbing panel, and FIG. 6A is a top view of the openable sound absorbing panel when the openable sound absorbing panel is extended (that is, when the door is closed). 2A and 2B show top views when the openable sound absorbing panel is folded (that is, when the door is opened).

The open / close type sound absorbing panel 3 shown in FIG. 5 and FIG.
Numeral 0 denotes a sound absorbing curtain 3 of the present invention in which a panel material 36 is formed by connecting a large number of plate-like materials 32 with hinges 34 and formed on both sides thereof in an elastic bellows shape.
8 and 38 are arranged, and the panel material 36 and the two sound absorbing curtains 38 are fixed at both ends of the bellows in the expansion and contraction direction (hereinafter referred to as the expansion and contraction direction). In the openable / closed sound absorbing panel 30, a sound absorbing curtain obtained by laminating cloth materials (one side or both sides) is particularly preferably used.

As shown in FIG. 6, the panel members 36 are formed by arranging plate members 32... In the expansion and contraction direction and connected by hinges 34. It is arranged to become. Therefore, FIG.
As shown in (b), the panel member 36 is configured to be alternately foldable for each plate member 32. The sound absorbing curtain 38 is formed in a bellows shape that can be freely extended and contracted.
Therefore, the openable / closable sound absorbing panel 30 of the present invention has the structure shown in FIG.
As shown in FIG. 5B and FIG. 5B, it is freely expandable and contractable (foldable) like an accordion curtain, and as shown in FIG. A sound absorbing panel that can be opened and closed quickly can be realized. Therefore, the openable / closable sound absorbing panel 30 of the present invention can be used similarly to accordion curtains and the like, and can be suitably used for partitions, room partitions, and the like.

There is no particular limitation on the method of shaping the sound absorbing curtain 38 into a stretchable bellows shape, and the sound absorbing curtain 38 may be shaped according to the material such as the mesh sheet 16, the thin film sheet 14, and the cloth material arranged as necessary. A method of applying a known creasing process by pressure, heating, or the like;
A method in which this is fixed to the panel material 36 by bonding or using a string material or the like with the bottom 46 and the opposite top side as the upper 48; plate-like materials corresponding to the folding interval (the interval between the bottom 46 and the upper 48); A method of arranging a frame or the like so that it can expand and contract like a bellows;
A method in which a bar-shaped reinforcing material according to the folding interval is attached to the upper side 42 and the lower side 44 of the sound absorbing curtain 38 so as to be able to expand and contract in a bellows-like manner; A method in which the bar-shaped reinforcing material is arranged on the bottom 46 and the upper part 48; Any known method for forming a sheet-like object into a stretchable bellows shape can be used. Further, even when the sound absorbing curtain 38 is formed in the above-described waveform instead of the bellows shape,
Needless to say, a similar openable sound absorbing panel can be realized, and this embodiment is also included in the openable sound absorbing panel of the present invention.

The method of connecting the panel member 36 is not limited to the hinge 34 in the illustrated example, but may be a connection using a bendable sheet material such as a cloth or a resin sheet, a connection using a ring-shaped member, or the like.
Various known methods that can make the plate-shaped material 32 alternately foldable and make the openable sound absorbing panel expandable and contractable are available.

In the openable / closed sound absorbing panel 30 of the illustrated example, in order to make the expansion and contraction easy and smooth and to make it as small as possible,
The width of the plate-shaped material 32 in the expansion and contraction direction and the pitch of the bellows of the sound-absorbing curtain 38 (the interval between the vertices) are made substantially the same, and the positions of the hinge 34 and the upper portion 48 are made to match in the expansion and contraction direction. Make up. Note that the openable / closed sound absorbing panel 30 of the present invention is not limited to the above configuration, and the width of the plate-like material 32 and the pitch of the bellows of the sound absorbing curtain 38 may be different. The width of the panel material may not be uniform, and the panel material may be configured using a plurality of types of plate-like materials having different widths.

The sound-absorbing panel of the present invention in which such a panel material and the sound-absorbing curtain of the present invention are combined provides the sound-insulating material of the panel material in addition to the excellent sound-absorbing characteristics of the above-described sound-absorbing curtain of the present invention. Characteristics can also be exhibited at the same time. Therefore, as a material having both a sound absorbing material and a sound insulating material, it can be suitably used for various uses such as partitioning, room partitioning, and laying.

In a second embodiment of the sound absorbing panel of the present invention, a plurality of the above sound absorbing curtains 10 of the present invention are fixed to a frame with a gap in the traveling direction of a sound wave, and at least one sound absorbing curtain is provided with another sound absorbing curtain. Is basically disposed at an angle with respect to the sound absorbing curtain. FIG. 7A is a partial cutaway schematic perspective view of an example of the sound absorbing panel according to the second embodiment of the present invention, and FIG. 7B is a sectional view taken along the line bb (top sectional view). .

The sound absorbing panel 60 of the illustrated example has a rectangular parallelepiped housing 62 having one side open as a frame, and the first sound absorbing curtain 10a is disposed with the open surface of the housing 62 closed. In addition, the upper and lower surfaces (a top surface 64 and a bottom surface 66) of the housing 62 in the drawing.
, A beam 68 is bridged in the vicinity of the open surface in the center in the left-right direction (hereinafter, referred to as the width direction) in the figure, and furthermore, a surface facing the open surfaces on both sides in the width direction of the beam 68 ( Beams 68 and 72 are bridged in the vicinity of the back surface. Each beam is bridged from the widthwise end of the open surface and bent in a substantially W shape (bent three times. ) The second sound absorbing curtain 10b is arranged. Here, in the sound absorbing panel 60, an open surface (hereinafter, referred to as a front surface) is generally arranged to face the sound source, and thus the traveling direction of the sound wave is from the front surface to the rear surface.

As described above, the sound absorbing curtain 10 of the present invention
(Sound-absorbing curtain structure) can adjust the sound-absorbing characteristic by the distance of the air layer behind, and when there are a plurality of sound-absorbing curtains, the interval between each sound-absorbing curtain, and the like. As shown in FIG. 7, the sound absorbing panel 60 is a rectangular parallelepiped housing 6.
The sound absorbing curtain 10a is arranged with its front surface closed, and the sound absorbing curtain 10b is arranged in a substantially W-shape on the back side thereof. That is, the sound absorbing curtain 10a and the sound absorbing curtain 1
0b and the gap between the sound absorbing curtain 10b and the back surface continuously change in the width direction of the housing 62. Therefore, the sound absorbing panel of the second aspect of the present invention in which at least one sound absorbing curtain is arranged at an angle with respect to the other sound absorbing curtains is similar to a combination of many sound absorbing materials having various sound absorbing characteristics. As a result, it has good sound absorbing characteristics over an extremely wide frequency range, as will be shown in the following examples.

The second embodiment of the sound-absorbing panel of the present invention is not limited to the structure of the illustrated example.
May be arranged linearly so as to obliquely cross the housing 62 from the widthwise end of the front surface to the widthwise end of the rear surface,
Alternatively, the sound absorbing curtain 10b may be arranged so as to have one or two refractions or four or more refractions, instead of a substantially W-shape having three refractions. Alternatively, the sound absorbing curtain 10a on the front side may be arranged obliquely or bent. Furthermore, the sound absorbing curtain 1 to be arranged
0 is not limited to two in the illustrated example, but three or more may be arranged. In the illustrated example, the sound absorbing curtain 10a and the sound absorbing curtain 10b have an angle in the width direction (the gap changes), but the present invention is not limited to this, and the sound absorbing curtain 10a and the sound absorbing curtain 10b It may have an angle in the direction toward it. Further, there may be a parallel portion between the sound absorbing curtain 10a and the sound absorbing curtain 10b. That is, in the second aspect of the sound absorbing panel of the present invention, a plurality of sound absorbing curtains of the present invention are arranged in the housing with a gap in the traveling direction of a sound wave, and at least one sound absorbing curtain (or a part thereof) is provided. All configurations are available, arranged at an angle to the sound absorbing curtain.

The method of fixing the sound-absorbing curtain to the housing 62 (frame) is not particularly limited, and a flexible sheet-like material is used for the frame, such as a method using an adhesive tape or an adhesive or a method using a jig. All known fixing methods for fixing are available. In the second aspect of the sound absorbing panel, it is preferable that the sound absorbing curtain is arranged in a state where the sound absorbing curtain is stretched by applying a slight tension.

Although the sound absorbing panel 60 in the illustrated example has a rectangular parallelepiped housing 62 whose one side is open as a frame, the present invention is not limited to this, and two opposing surfaces (for example, a front surface and a front surface in the illustrated example). A frame body (cylindrical body) having an open back surface may be used.
In addition, the shape of the frame (housing) is not limited to the rectangular parallelepiped in the illustrated example, and various shapes such as a column, a cube, and a polygonal column can be used. The frame may be formed of various metal materials such as stainless steel and aluminum, various resins, and materials such as wood. In the sound absorbing panel 60, the second
A known sound absorbing material such as glass wool or metal sintered material may be arranged on the back side of the sound absorbing curtain 10b. In the case of outdoor use, a thin film such as a Teflon sheet having a thickness of about 6 to 20 μm is disposed on the front surface to prevent water and the like from entering the sound absorbing panel 60, and to provide water resistance and weather resistance. May be improved. Furthermore, in order to improve the mechanical strength such as the rigidity of the sound-absorbing panel and to protect the sound-absorbing curtain on the front side, a plate material having a large number of openings such as punching metal, wire mesh, and expanded metal on the front surface of the housing (frame). May be arranged. In this case, a thin film such as the Teflon sheet may be arranged between the plate material and the sound absorbing curtain.

In the second embodiment of the sound-absorbing panel of the present invention, the gap between the sound-absorbing curtains and the distance from the rear side of the sound-absorbing curtain to the rear surface (the wall surface or floor surface of the sound absorbing panel grounding location), that is, the air layer is not particularly limited. No, but 30-70
With a thickness of about mm, a sound absorbing panel having good sound absorbing characteristics can be realized. Therefore, the distance from the front to the back of the sound absorbing panel (that is, the thickness of the sound absorbing panel) is 100.
Good sound absorption characteristics can be obtained at about mm, and a sound absorbing panel that is thin and takes up little space can be realized.

In the second embodiment of such a sound absorbing panel of the present invention, an aluminum (Al) -based expanded metal and an areal density of 500 g / m ² to 500 g are disclosed in Japanese Patent Publication No. 4-13142 by the present applicant. A metal porous material obtained by pressing a laminate with an Al-based metal fiber layer of 3000 g / m ² , preferably a metal porous material 88 obtained by holding an Al-based metal fiber layer with Al-based expanded metal and pressing the same. And FIG.
As shown in (c), it may be arranged on the front surface. Expanded metal is a metal plate in which a number of linear cuts are made and pulled in a direction substantially perpendicular to the cut to form a net. The metal porous material 88 is formed on one side of an Al-based metal fiber layer or A laminate having Al-based expanded metal disposed on both sides is formed, and the laminate is weighed at 300 kg / c.
By press or roll rolling at about m ^{2 to} 2000 kg / cm ² , the Al-based expanded metal and the Al-based metal fiber can be pressed and manufactured.

The metal porous material 88 and the sound absorbing panel 60 of the present invention both have excellent sound absorbing properties. However, as will be described later in the examples, the combination of the two provides more excellent sound absorbing properties. Obtainable. It is also preferable in terms of the mechanical strength and weather resistance of the sound absorbing panel 60. Also, as described above, the metal porous material 88 is made of A
The higher the surface density of the l-based metal fiber, the better the sound absorbing properties are shown. However, by combining the sound absorbing panel 60 of the present invention, the amount of expensive Al-based metal fiber is reduced, and the surface density of the Al-based metal fiber is reduced. However, excellent sound absorption characteristics can be obtained.

The method for fixing the metal porous material 88 to the sound absorbing panel 60 is not particularly limited, and any known method for fixing the panel material to the frame (housing) can be used. Also,
The fixing position of the metal porous material 88 is not limited to the front surface in the illustrated example, and may be on the rear surface side. Further, the metal porous material 88 may be fixed to a part of the front surface without being attached to the entire surface. Alternatively, the sound absorbing panel 60 (or the sound absorbing curtain 10) and the metal porous material 88 may be arranged with a gap. The metal porous material 8 of the sound absorbing panel 60
In the embodiment using the metal sheet 8, a thin film such as a Teflon sheet may be disposed on the front surface of the metal porous material 88, or may be disposed between the metal porous material 88 and the first sound absorbing curtain 10a. .

Although the sound absorbing curtain, the sound absorbing curtain structure and the sound absorbing panel of the present invention have been described in detail, the present invention is not limited thereto, and various changes and improvements can be made without departing from the gist of the present invention. Of course you can do it.

[0069]

Hereinafter, the present invention will be described in more detail with reference to specific examples of the present invention. Example 1 The following various sound absorbing curtains were produced. Sound-absorbing curtain A (product of the present invention) A 7 μm-thick aluminum foil sheet and a glass-fiber woven mesh fabric (plain woven, 0.15 mm thick, 20 mesh = mesh opening 0.84 mm) were converted to vinyl chloride. A sound-absorbing curtain which is adhered using a system adhesive and then formed with a break 12 (break 14a) as shown in FIG. The broken portion 12 is a rectangle having a vertical dimension of 0.8 mm and a horizontal dimension of 0.3 mm, and is formed at intervals of 5 mm in the vertical direction and 2.4 mm in the horizontal direction.

Sound absorbing curtain B (product of the present invention) A sound absorbing curtain exactly the same as the above sound absorbing curtain A, except that a polyvinyl acetate sheet having a thickness of 12 μm was used as the thin film sheet.

Sound Absorbing Curtain C A sound absorbing curtain having a state as shown in FIG. 2 (c) by removing all the broken portions 14a of the sound absorbing curtain A.

Sound Absorbing Curtain D (Product of the Present Invention) A sound absorbing curtain in which a cotton cloth having a thickness of 0.5 mm is further laminated on one surface of the sound absorbing curtain A, and the edges are sewn along the outer periphery.

Sound Absorbing Curtain E (Product of the Present Invention) A sound absorbing curtain in which a cotton cloth having a thickness of 0.5 mm is laminated on both surfaces of the sound absorbing curtain A, and the edges are sewn along the outer periphery.

With respect to the above various sound absorbing curtains, 500, 800, 1000, 1
Normal incidence sound absorption coefficient (JIS 1405-1963) at each frequency [Hz] of 600, 2000 and 2500
Was measured. The results (expressed as a percentage) are shown in Table 1 below.

<Sample a> Air layer is 120 mm from the bottom
Thus, the sound absorbing curtain A was fixed. <Sample b> The sound absorbing curtain A was fixed by taking an air layer of 80 mm from the bottom, and the air layer was 40 mm from the sound absorbing curtain A.
Thus, another sound absorbing curtain A was fixed. <Sample c> An air layer was taken 120 mm from the bottom surface, and the sound absorbing curtain B was fixed. <Sample d> The sound absorbing curtain B was fixed by taking an air layer of 80 mm from the bottom, and the air layer was 40 mm from the sound absorbing curtain A.
Thus, another sound absorbing curtain B was fixed. <Sample e> The sound absorbing curtain A was fixed by taking an air layer of 80 mm from the bottom, and the air layer was 40 mm from the sound absorbing curtain A.
Thus, the sound absorbing curtain B was fixed. <Sample f> An air layer was taken 120 mm from the bottom, and the sound absorbing curtain C was fixed. <Sample g> The sound absorbing curtain D was fixed by taking an air layer of 120 mm from the bottom surface. <Sample h> An air layer was taken 120 mm from the bottom, and the sound absorbing curtain E was fixed.

[0076]

[Table 1]

As shown in Table 1, the sound absorbing structure of the present invention using the sound absorbing curtain of the present invention exhibits a good sound absorbing coefficient over a wide frequency range. Further, in order to obtain good sound absorption characteristics, the broken portion 14a is essential. Also,
All of the sound absorbing curtains A, B, D and E of the present invention could be easily stored by winding or folding.

[Example 2] The sound absorbing curtain A of Example 1
As for the sound absorbing curtain C and the sound absorbing curtain E, the air layer is taken as 100 mm, and the sound absorption coefficient by the normal incidence method (JIS 1405
-1963). The results are shown in FIG. 8. By laminating a cloth on the sound absorbing curtain of the present invention,
In particular, the sound absorption coefficient in the low frequency region is improved, and better sound absorption characteristics can be obtained. As described above, it is also advantageous in terms of decoration.

Example 3 The sound absorbing curtain E of Example 1 was textured to form a wavy shape as shown in FIG. 9 (sewing), and the reverberation chamber method sound absorption was measured in accordance with JIS A1409-1967. . As shown conceptually in FIG. 9, the sound absorbing curtain E has a wave height of 60 mm and a pitch of 120 mm.
mm, and the distance from the wall to the vertex is 6
It was fixed in a reverberation room so that the distance from the wall to the bottom was 120 mm. The results are shown in FIG. 10, which has extremely excellent sound absorption characteristics, and particularly in the region of 500 Hz or higher, exhibits excellent sound absorption characteristics of 0.9 (90%) or more in most regions. The reason for this is that, as described above, by forming in a wavy shape like a normal curtain, the distance from the wall surface to the sound absorbing curtain E changes communicatively, so that the sound absorbing efficiency has been improved from low frequencies to high frequencies. It is believed that there is.

Example 4 A 20-μm-thick aluminum foil sheet and a mesh-like woven fabric made of glass fibers (plain weave, 0.15 mm thick, about 30 mesh = opening of about 0,0 mesh).
6 mm) with a vinyl chloride-based adhesive, and then, as shown in FIG.
a) was formed to produce a sound absorbing curtain of the present invention (hereinafter referred to as a sound absorbing curtain F). The broken part 12 is a rectangle having a vertical dimension of 0.6 mm and a horizontal dimension of 0.35 mm in the figure. The central part in the vertical direction is cut off by 0.3 mm, and the remaining part is a broken part 14a. The formation interval (center interval) of the broken portions 12 was 6.2 mm in the vertical direction and 3.1 mm in the horizontal direction. Using two such sound-absorbing curtains F, the sound absorption coefficient by the normal incidence method (according to JIS 1405-1963) was measured for the following samples in which the back air layer was variously changed. <Sample j> An air layer was taken 10 mm from the bottom and the sound absorbing curtain F was fixed, and the air layer was 90 mm from the sound absorbing curtain F.
Then, another sound absorbing curtain F was fixed. <Sample k> The sound absorbing curtain F was fixed by taking an air layer of 80 mm from the bottom, and the air layer was 20 mm from the sound absorbing curtain F.
Then, another sound absorbing curtain F was fixed. <Sample 1> The sound absorbing curtain F was fixed by taking an air layer 70 mm from the bottom, and the air layer was 30 mm from the sound absorbing curtain F.
Then, another sound absorbing curtain F was fixed. <Sample m> The sound absorbing curtain F was fixed by taking an air layer of 60 mm from the bottom, and the air layer was 40 mm from the sound absorbing curtain F.
Then, another sound absorbing curtain F was fixed.

The results are shown in FIG. 11. Even if the total of the air layers is the same (100 mm), different characteristics are obtained due to the difference in the distance between the two sound absorbing curtains and the distance from the sound absorbing curtain to the bottom surface on the bottom surface side. Can be obtained. When the same experiment was performed with the total of the air layers being 80 mm, almost the same results were obtained.

Example 5 Using the sound absorbing curtain F of Example 1, a sound absorbing panel of the second embodiment of the present invention as shown in FIG. 7 was manufactured. FIG. 12 shows a schematic diagram and specifications (unit: mm) of the produced sound-absorbing panel. The frame 82 of the sound-absorbing panel 80 is not a rectangular parallelepiped whose one surface is open, but is a square tube whose opposing surface is open. Using
One side to be opened was closed with a sound absorbing curtain F, and this was made the front side. FIG. 12A is a view of the sound absorbing panel 80 as viewed from the front, FIG. 12B is a cross-sectional view of the sound absorbing panel 80 taken along the line bb, and the sound absorbing curtain F is indicated by reference numeral F. In addition, an Al expanded metal 84 was laminated on the front surface of the sound absorbing panel 80 (not shown in FIG. 12A).

The sound absorbing panel 80 is described in JI.
The reverberation chamber method sound absorption was measured according to SA1409-1967. That is, reference numeral 86 in FIG. 12 indicates a floor plate of a reverberation room. The results are shown in FIG. 13 (a). It is possible to obtain good sound absorption characteristics without unevenness over a wide frequency band.

Example 6 An Al fiber non-woven fabric having a surface density of 550 g / m ² was sandwiched between Al expanded metals having a thickness of 0.5 mm (a center distance in the short direction of the opening 20 was 5 mm and a center distance in the long direction was 10 mm). Then, a metal porous material having a thickness of 0.9 mm obtained by pressing and pressing at a pressure of 1 ton / cm ² is
A sound absorbing panel 80 of Example 5 was laminated and fixed on the front surface of the sound absorbing panel 80, and a sound absorbing panel of the present invention (see FIG. 7C) was manufactured. Using such a sound absorbing panel, the reverberation room sound absorption coefficient was measured in the same manner as in Example 5. The results are shown in FIG.
As shown in FIG. 7, there is no unevenness over a wide frequency band, and better sound absorbing characteristics can be obtained.

[Seventh Embodiment] The sound absorbing curtain D of the first embodiment
(Sound-absorbing curtain A in which a 0.5 mm-thick cotton cloth is further laminated on sound-absorbing curtain A and the edges are sewn along the outer periphery.)
Was used to produce the openable / closable sound absorbing panel 30 shown in FIGS. 5 and 6. The sound absorbing curtain D was formed into a bellows shape with a pitch of 50 mm and a height (upper height) of 60 mm by creasing and sewing. As the plate-shaped member 32, an aluminum plate having a thickness of 1.2 mm was used, and this was connected with a hinge 34 to form a panel member 36. In addition, the width of the plate-shaped material 32 was the same as the pitch of the bellows. The sound transmission loss characteristics of such an openable / closable sound absorbing panel 30 were measured in accordance with JIS A1416 1974. The results are shown in FIG. FIG. 14B also shows the result of the same measurement performed only on the panel material 36. As shown in FIG. 14, the openable / closed sound absorbing panel 30 of the present invention has a very good sound insulating property due to a synergistic effect of the sound absorbing (sound insulating) property of the sound absorbing curtain and the sound insulating property of the panel material 36. From the above results, the effect of the present invention is clear.

[0086]

As described above in detail, according to the sound absorbing curtain and the sound absorbing curtain structure of the present invention, the sound absorbing curtain has excellent sound absorbing characteristics, and can be installed hanging from a ceiling or the like. It is easy to use in places with complicated shapes and in places with complicated shapes, and it can be easily stored such as winding and folding, so that piping and wiring in factories and ships, etc. The present invention can be suitably used in applications where it is difficult to use a conventional panel-shaped sound absorbing material, such as a portion, a portion having a complicated shape, and a window of a piano room. The sound-absorbing panel of the present invention has excellent sound-absorbing characteristics utilizing the above-described sound-absorbing curtain of the present invention, and is a lightweight and inexpensive sound-absorbing panel, which is suitable for various uses such as building materials, partitions, and partitions. It can be suitably used.

[Brief description of the drawings]

FIG. 1 is a schematic exploded view of an example of a sound absorbing curtain of the present invention.

2A is a schematic cross-sectional view for explaining an example of a method for manufacturing a sound-absorbing curtain of the present invention, and FIG. 2B is a schematic cross-sectional view when the sound-absorbing curtain shown in FIG. 1 is viewed from another direction. ,
(C) Sound-absorbing curtain from which the broken part has been removed (comparative product)
FIG.

FIGS. 3A and 3B are diagrams conceptually showing a configuration example of a sound absorbing curtain structure of the present invention.

FIG. 4 is a conceptual diagram illustrating a sound absorbing effect of the sound absorbing curtain structure of the present invention.

FIG. 5 is a schematic perspective view showing an example of the first embodiment of the sound absorbing panel of the present invention and an example of its use form.

6A is a top view of the sound absorbing panel shown in FIG. 5 in an extended state, and FIG. 6B is a top view of the sound absorbing panel in a contracted state.

7 (a) is a partially cutaway perspective view of an example of the second embodiment of the sound absorbing panel of the present invention, FIG. 7 (b) is a schematic sectional view taken along the line bb, and FIG. 7 (c) is a second view of the sound absorbing panel. FIG. 10 is a schematic sectional view of another embodiment of the embodiment.

FIG. 8 is a graph showing a normal-incidence sound absorption coefficient of the sound-absorbing curtain structure of the present invention.

FIG. 9 is a conceptual diagram illustrating a sound absorbing curtain according to an embodiment of the present invention.

FIG. 10 is a graph showing the reverberation room method sound absorption coefficient of the sound absorbing curtain shown in FIG. 9;

FIG. 11 is a graph showing a normal incidence sound absorption coefficient of the sound absorbing curtain structure of the present invention.

FIG. 12A is a schematic view of an embodiment of the second embodiment of the sound absorbing panel of the present invention when viewed from the front, and FIG. 12B is a schematic sectional view taken along the line bb of FIG.

FIG. 13 is a graph showing a reverberation room method sound absorption coefficient of the sound absorbing panel shown in FIG.

FIG. 14 is a graph showing transmission loss characteristics of the openable sound absorbing panel of the present invention.

[Explanation of symbols]

 10, 38 Sound absorbing curtain 12 Break portion 14 Thin film sheet 14a Break portion 16 Reticulated sheet 20 Wall surface 22 Ceiling 30 Open / close type sound absorbing panel 32 Plate material 34 Hinge 36 Panel material 42 Top side 44 Bottom side 46 Bottom 48 Top 60, 80 Sound absorbing panel 62, 82 Frame 64 Upper surface 66 Bottom surface 68, 70, 72 Beam 84 Expanded metal 86 Floor plate 88 Metal porous material

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-6-83365 (JP, A) JP-A-4-18600 (JP, A) JP-A-1-283597 (JP, A) JP-A-62-83 282922 (JP, A) JP-A-7-213418 (JP, A) JP-A-62-8715 (JP, A) JP-A-52-12071 (JP, A) JP-A-49-83222 (JP, A) Japanese Utility Model Showa 52-13301 (JP, U) Japanese Utility Model Showa 60-181408 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) E04B 1/82 A47H 23/08 E04B 1/86 G10K 11/16

Claims (9)

(57) [Claims] 1. A sound absorbing curtain comprising a flexible net-like sheet and a thin film having a large number of breaks adhered thereto, wherein the thin film at the break is vibrated by sound waves. 2. A sound absorbing curtain according to claim 1, wherein a cloth is further laminated on at least one surface of the sound absorbing curtain. 3. The sound absorbing curtain according to claim 1, wherein the sound absorbing curtain is formed in a wavy shape. 4. A sound-absorbing curtain structure according to claim 1, wherein one or a plurality of the sound-absorbing curtains according to any one of claims 1 to 3 are arranged with a gap therebetween and an air layer is provided on a wall surface. 5. A sound-absorbing panel comprising the sound-absorbing curtain according to claim 1 disposed on one or both sides of a panel material. 6. The sound absorbing curtain according to claim 5, wherein said sound absorbing curtain is formed in a stretchable bellows shape, and said panel material is composed of a plurality of plate-like members arranged in the direction of expansion and contraction of said bellows and connected to each other so as to be able to bend. The described sound absorbing panel. 7. A sound absorbing curtain comprising a plurality of sound absorbing curtains according to claim 1, and a frame body for fixing the sound absorbing curtain, wherein the sound absorbing curtain is fixed at intervals in a traveling direction of a sound wave; A sound absorbing panel, wherein at least one sound absorbing curtain is arranged at an angle with respect to another sound absorbing curtain. 8. The sound absorbing panel according to claim 7, wherein the sound absorbing curtain arranged at an angle has a bending portion. 9. The method of claim 7 or the surface of the wave incident side of the sound-absorbing panel according to 8, further laminate of aluminum-based expanded aluminum metal fiber layer of metal and the surface density of 500g / m ² ~3000g / m ² Sound-absorbing panel with a metal porous material formed by crimping.