JPH0842015A - Sound-absorbing curtain and structure and sound-absorbing panel - Google Patents

Abstract

PURPOSE:To easily make use of a sound-absorbing curtain in an intricate place or a complicated location, by sticking a flexible netted sheet to a thin film provided with a number of broken parts and enabling the thin film at time broken part to oscillate in accordance with sound wave. CONSTITUTION:A thin film sheet 14 provided with broken parts 12 is stuck to a flexible netted sheet 16 to constitute a sound-absorbing curtain 10. The thin film sheet 14 of the broken parts 12 is made to enable oscillation due to sound wave. The thin film sheet 14 having the broken parts 14a which can be oscillated by sound wave and the netted sheet 16 are stuck together at the whole face and the broken parts 14a are well and very finely oscillated to absorb the sound energy well. In this way, an excellent sound-absorbing characteristic is brought out.

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 properties and which can be placed (installed) by being hung from a ceiling or the like, and easily accommodated for winding, folding and the like. Also, the present invention relates to a sound absorbing curtain structure and a sound absorbing panel using this sound absorbing curtain.

[0002]

2. Description of the Related Art Conventionally used sound absorbing materials are various kinds of porous materials such as glass wool, metal fibers, and metal sintered materials, which are panelized and used by being attached to a wall surface or the like. . Therefore, these conventional sound absorbing materials require a processing cost for making a panel in addition to the cost of the sound absorbing material itself, resulting in a very high cost.

The sound absorbing material is not limited to a flat space,
It is also necessary to install it in complicated parts such as in the factory or in ships where piping and wiring are complicated, curved parts and parts with complicated shapes. However, with the conventional panel-shaped sound absorbing material, it is difficult to mount them in a good condition at a position where these sufficient spaces cannot be secured, the cost for mounting becomes high, and it is necessary to further process the sound absorbing material. Sometimes there is. Moreover, it is often impossible to obtain a predetermined sound absorption characteristic depending on the mounting condition.

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

Therefore, no processing such as paneling is required; it can be easily installed even in a complicated place or a place having a complicated shape, and can exhibit desired sound absorption characteristics; easy storage by folding or winding. It is easy and possible to use it for windows, etc .; and the advent of a curtain-shaped sound-absorbing material (sound-absorbing curtain), which can be expected to have such advantages, is desired. However, a sound absorbing curtain having good sound absorbing characteristics and having 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. It has excellent sound absorption characteristics and can be installed by being hung from a ceiling or the like.
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 that can be easily stored, such as wound up and folded, and a sound absorbing curtain structure and a sound absorbing panel using the sound absorbing curtain.

[0007]

In order to achieve the above object, the present inventor has conducted extensive studies and, as a result, has achieved the present invention by obtaining the following findings.

It is conventionally known that a slight sound absorbing action is exhibited by vibrating a thin film such as a vinyl sheet or an aluminum foil, that is, by vibrating a smooth surface. Although it is possible to produce a sound absorbing material by utilizing this, the sound absorbing effect obtained by utilizing the vibration of this smooth surface (membrane vibration) is very low, and the sound absorbing coefficient is 0.1 to 0.1 on average. It is about 0.2 (10 to 20%).

On the other hand, as a result of intensive studies by the present inventor, an excellent film vibration absorbing material is realized by sandwiching a resin thin film between plate-like members having a large number of openings such as expanded metal and punching metal. He found out what he could do and proposed it in Japanese Patent Application No. 5-20227. In this sound absorbing material, a sound absorbing action is caused by the resin thin film vibrating by the action of a sound wave (vibrating air) hitting 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 this sound wave flow. Sound absorption by;
Due to the vibration of the resin thin film, the resin thin film hits the punching metal, and the sound absorbing action by absorbing the energy of vibration and sound is expressed respectively, and the excellent sound absorbing property is exhibited by the mutual effect of the respective sound absorbing actions.

Further, Japanese Patent Publication No. 5-29920 discloses that
As a sound-absorbing material that uses membrane vibration, a lattice-shaped wooden frame or the like is used to apply tension to the thin film and to divide the film into small areas. A sound absorption method is disclosed in which sound waves having different phases are emitted from each thin film to absorb sound by mutual interference of the sound waves.

Further, according to the research conducted by the present inventor, if a metal (resin) thin film having a fractured part is sandwiched by expanded metal and the metal thin film at the fractured part can be vibrated by a sound wave, the film at this fractured part Previously, it was possible to realize a sound absorbing material having a good sound absorbing effect by vibration.
No. 18600 is disclosed.

That is, in the prior art, in order to realize a sound absorbing material having a sufficient sound absorbing property by utilizing the film vibration of a thin film which can be expected to be used for a sound absorbing curtain, punching metal, a grid-like frame body, etc. It was thought that the support of the thin film by the rigid body was essential. However, with these methods, the result is a panel-shaped sound absorbing material similar to the conventional one, and it is possible to realize a sound absorbing curtain having various advantages such as being able to be wound up and being easy to install. You cannot do it.

On the other hand, the present inventor has conducted extensive studies in order to realize a sound absorbing curtain having a sufficient sound absorbing characteristic, and as a result, a metal thin film or a resin thin film having a broken portion and a flexible mesh sheet ( It has been found that a good sound absorbing action can be obtained without supporting the thin film by the rigid body, by adhering the screen mesh) and vibrating the thin film at the breaking portion. By having the above-mentioned configuration, when a sound wave is incident, the thin film at the breakage portion vibrates extremely finely and expresses a good sound absorbing action, and it is found that a sound absorbing curtain having excellent sound absorbing characteristics can be realized, and The sound absorbing curtain and the sound absorbing curtain structure of the present invention have been formed.

Further, the present inventor has found that the sound absorbing panel of the present invention can be realized by utilizing the above-mentioned sound absorbing curtain of the present invention to realize a lightweight, inexpensive and panel-like sound absorbing material having excellent sound absorbing characteristics. It came to completion.

That is, the sound-absorbing curtain of the present invention comprises a flexible mesh sheet and a thin film having a large number of breaks, which are attached to each other, and the thin film at the breaks can be vibrated by sound waves. To provide a sound absorbing curtain.

It is preferable that 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 wavy shape.

Further, the sound absorbing curtain structure of the present invention is characterized in that one sound absorbing curtain of the present invention or a plurality of the sound absorbing curtains of the present invention are provided, and an air layer is provided on the wall surface. Provide the 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 surface or both surfaces of a panel material.

In addition, in the first aspect of the sound absorbing panel of the present invention, the sound absorbing curtain is formed into an expandable and contractible bellows shape, and the panel materials are arranged in the expanding and contracting direction of the bellows and are flexibly connected to each other. It is preferably composed of a plurality of plate-shaped members.

A second aspect of the sound absorbing panel of the present invention has a plurality of the sound absorbing curtains of the present invention and a frame body for fixing the sound absorbing curtains, and the sound absorbing curtains are arranged in a traveling direction of sound waves. Provided is a sound absorbing panel characterized in that it is fixed at intervals and at least one sound absorbing curtain is arranged at an angle with respect to another sound absorbing curtain.

In the second aspect of the sound absorbing panel of the present invention, it is preferable that the sound absorbing curtain arranged at the angle has a refraction 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 wave incident side surface of the sound absorbing panel.
You may arrange | position the metallic porous material formed by pressure-bonding the laminated body with the aluminum-based metal fiber layer of -3000 g / m < ² >.

The sound absorbing curtain of the present invention, and the sound absorbing curtain structure and the sound absorbing panel of the present invention using the sound absorbing curtain will be described in detail below.

FIGS. 1 and 2 (b) are conceptual views showing an example of the sound absorbing curtain of the present invention. 1 is an exploded view of the sound absorbing curtain of the present invention as seen from the sheet surface direction (front) (front view), and FIG. 2 (b) shows the sound absorbing curtain.
FIG. 4 is a partially enlarged view of a cross section as viewed in a direction perpendicular to FIG. The sound absorbing curtain 10 of the present invention in the illustrated example has a structure in which a thin film sheet 14 having a ruptured portion 12 and a flexible mesh sheet (flexible screen mesh) 16 are attached. Here, in the sound absorbing curtain 10 of the present invention, the thin film sheet 14 of the fractured portion 12 (hereinafter, this portion is referred to as a fractured 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 action, but the sound absorbing effect obtained by utilizing the vibration of the smooth surface (membrane vibration) is very low, Sound absorption coefficient is 0.1 to 0.2 (10 to 20%) on average
However, 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 and the net-like sheet 16 having the breakable portion 14a that can be vibrated by a sound wave are adhered over the entire surface, so that the breakable portion 14a can be satisfactorily exposed to the sound wave. It can vibrate extremely finely and absorb sound energy well, and as will be described in detail in later Examples, it exhibits excellent sound absorbing characteristics.

Moreover, the sound absorbing curtain of the present invention as described above has good flexibility because of its structure, and can be easily used in a complicated place or a place having a complicated shape, and can be wound or folded. It is possible to easily store the sheet-shaped material such as a curtain by a known storage method. Therefore, it is difficult to use the conventional panel-shaped sound absorbing material such as the complicated parts such as the pipes and wiring in the factory or the ship, the curved parts and the complicated shapes, and the windows of the piano room. It is also suitable for certain applications. Moreover, since it is composed of only the thin film sheet 14 and the mesh sheet 16, it is possible to realize a lightweight and inexpensive sound absorbing curtain (sound absorbing material).

The material of the thin film sheet 14 used in 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, polyvinylidene are used. Any of various known resin thin films such as an acrylic thin film and an acrylic thin film can be applied, but a metal thin film, an ethylene fluoride thin film, and a polyvinylidene thin film are preferable in terms of sound absorption characteristics, weather resistance, durability, etc. It is particularly preferably used.

As the ethylene fluoride resin used for the ethylene fluoride thin film, various known resins are exemplified, but tetrafluoroethylene (PTFE), tetrafluoroethylene-6.
Fluoropropylene copolymer, tetrafluoroethylene / polyethylene copolymer (ETFE), trifluoroethylene chloride (PCT
FE) and the like are preferably exemplified. These fluoroethylene-based 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, but vinylidene difluoride (PVDF), vinylidene cyanide, etc. are preferably exemplified. These vinylidene resins are excellent in chemical resistance and weather resistance. Further, 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 as long as the breaking portion 14a can be vibrated by a sound wave according to the physical properties of the material. For example, the thin film sheet 14
In the case where is a resin thin film, the thickness of the thin film sheet 14 is preferably 6 μm to exhibit good sound absorption characteristics.
It is about 30 μm, more preferably about 6 to 15 μm. Further, when the thin film sheet 14 is a metal thin film such as aluminum foil, the thickness of the thin film sheet 14 is preferably about 5 μm to 10 μm, more preferably about 7 to 9 μm.

There is no particular limitation on the material of the mesh sheet 16 used in the sound absorbing curtain 10 of the present invention, and when suspended, it has a good flat shape without waviness and is easily wound. Reticulated sheets (screen mesh) made of various materials can be used as long as they have flexibility. Specifically, a screen mesh formed of the material for forming the thin film sheet 14 described above,
Preferable examples include mesh fabrics woven with various fibers such as glass fibers, carbon fibers, and resin fibers.

The thickness of the mesh sheet 16 is not particularly limited, and may be any thickness as long as it becomes a good flat surface when suspended, depending on the material and form of the mesh sheet 16. Further, the opening ratio (mesh size) of the mesh sheet 16 is not particularly limited, but in order to exhibit a good sound absorbing property, it is 10 to 3
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, the thin film sheet 14 and / or the mesh sheet 16 may be formed by laminating two or more thin film sheets 14 or the mesh sheet 16 directly if necessary. ,Also,
The thin film sheet 14 and the mesh sheet 16 may have two or more overlapping units.

The sound absorbing curtain 10 of the present invention as described above is
After the thin film sheet 14 and the mesh sheet 16 are attached to each other as shown in FIG.
By forming a fractured portion 1 in advance
It can be manufactured by sticking the thin film sheet 14 on which 2 is formed and the mesh sheet 16 together. Thin film sheet 1
There is no particular limitation on the method of attaching 4 and the mesh sheet 16,
Various methods are exemplified, such as a method of using an adhesive material corresponding to both forming materials, a method of fusing with heat without crushing the mesh and the fractured portion 14a, and the like.

There is no particular limitation on the method of forming the breakage portion 12, and the thin film sheet 14 (or the adhered body with the mesh sheet 16) is conveyed by using a roller having a projection corresponding to the breakage portion 12. Make a notch and break 1
The thin film sheet 14 (or the mesh sheet 1
It is possible to use a method in which a cut is made by pressing the (adhesive body with 6) to form the broken portion 12, and the like. What is important here is to leave the fractured portion 14a as much as possible when forming the fractured portion 12. The more the broken portions 14a, the better the sound absorbing characteristics of the sound absorbing curtain 10 of the present invention.

The size and shape of the fractured portions 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. Also, the fractured portion 12
The formation of can be regular or irregular. The size of the fractured part 12 is not particularly limited, but is preferably about 0.1 mm to 1 cm, and by adopting this size, favorable results can be obtained in terms of sound absorption characteristics and the like. Also, in order to obtain good sound absorption characteristics, the fractured portion 1
It is preferable that the formation density of 2 (broken parts 14a) is high (that is, the number of broken parts 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 side or the mesh sheet 16 side, preferably on both sides with the sound absorbing curtain 10 of the present invention sandwiched therebetween. You may. With such a configuration, it is possible to improve the sound absorption characteristics, particularly, the sound absorption characteristics in the low frequency region, which will be described in detail later in Examples, and further, the sound absorbing curtain of the present invention can be provided with a decorative property and a light shielding property. It can be more suitably used as a decorative material, a curtain for a general household, a theater, a gymnasium, a dark curtain for a concert hall, or the like. In addition, nonflammable 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 cloths and non-woven cloths can be used.
You may use multiple sheets. Furthermore, as a cloth material, color,
As described above, a pattern or a pattern may be used to impart decorativeness.

The method of manufacturing the sound absorbing curtain of the present invention in which the cloth materials are laminated is not particularly limited, and after the cloth material is arranged on one surface or both surfaces of the sound absorbing curtain 10, the appropriate positions of the ends are bonded or sewn together. Various methods such as a method of fixing by a method, a method of adhering or sewing one side or a plurality of sides (at least a part of edges) of the laminated body can be used. When manufacturing the embodiment in which the cloth material is laminated, the cloth material and the thin film sheet 14 or the mesh sheet 16 may be first laminated and fixed, and then the rest may be attached. Also, in terms of strength,
If necessary, not only the ends but the inside may be glued or sewn together. Note that it is important that the fixing of the cloth material does not disturb the vibration of the fractured portion 14a, and therefore, the point or linear fixing is preferable to the planar fixing.

The sound-absorbing curtain 10 of the present invention (or the sound-absorbing curtain formed by laminating the above-mentioned cloth materials) exhibits good sound-absorbing characteristics even if it remains flat, but is preferably wavy (bellows-like) like a normal curtain. By shaping it (see FIG. 9), more excellent sound absorption characteristics can be exhibited. There is no limitation on the method of forming the sound absorbing curtain 10 or the like into a wavy shape,
Wrinkle the cloth or sheet material, such as making a fold in the sound absorbing curtain to form a wavy shape, forming a sound absorbing curtain into a wavy shape, or making it wavy when suspended using a member such as a rail. All known methods of shaping are available.

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

The sound absorbing curtain structure of the present invention includes the above-described sound absorbing curtain 10 of the present invention (including a mode in which cloth materials are laminated and a mode in which it is formed into a wavy shape).
One (or 0) is provided or a plurality of them are provided with a gap, and an air layer is provided on the wall surface (sound insulation). As described above, the sound absorbing curtain structure of the present invention in which one sound absorbing curtain 10 of the present invention is arranged with an air layer provided on the wall surface 20 as shown in FIG. Develop a property.

Further, as shown in FIG. 3B, the sound absorbing curtain structure of the present invention in which a plurality of sound absorbing curtains are provided with a gap and an air layer is provided on the wall surface 20 is shown in FIG. As shown schematically, the sound waves that have passed through the first sound absorbing curtain are absorbed by the sound absorbing curtain that is placed next,
Further, the sound waves reflected by the wall surface 20 can be similarly absorbed by the 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 together, it is possible to realize a sound absorbing material in which the characteristics of each sound absorbing curtain are mixed and which exhibits good sound absorbing characteristics over a wide frequency range.

Although two sound absorbing curtains of the present invention are arranged in the illustrated example, the sound absorbing structure of the present invention is not limited to this, and three or more sound absorbing curtains are arranged. Good. Further, it is possible to use together with a conventional panel-shaped sound absorbing material, including a mode in which one sheet of the above-mentioned sound absorbing curtain of the present invention is used.

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 sound absorbing curtains. Since the (frequency band having good sound absorption characteristics) can be adjusted, the position where the sound absorbing curtain is arranged may be appropriately determined according to the frequency band 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 a normal sound absorbing material. But usually
It is about 50 to 150 mm, preferably about 60 to 120 mm. Further, in a mode 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) varies depending on the frequency of sound absorption, but is 10 to 140 mm. The sound absorbing curtains may be arranged so that the sound absorbing curtain has a size of about 30 to 60 mm. The intervals of the sound absorbing curtains may be the same or different.

In the sound absorbing curtain structure of the present invention as described above, the sound absorbing curtain 10 of the present invention is fixed directly to the ceiling 22 or to the beam for fixing the sound absorbing curtain by providing an air layer on the wall surface 20. The sound absorbing curtain of the present invention can be fixed by such a method as described above and suspended from above. Further, like the normal curtain, 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 to form 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 method of fixing a sheet-like object (hanging method) can be used.

Further, in the sound absorbing curtain structure of the present invention, the lower end portion of the sound absorbing curtain may be fixed if necessary, or the sound absorbing curtain may be formed by a known method for accommodating a sheet-like material such as winding and folding. May be configured to be stored. Further, in an aspect having a plurality of sound absorbing curtains, a holding member may be provided to keep the lower end portions of the curtains at a predetermined interval.

In the sound absorbing curtain structure of the present invention,
The sound absorbing curtain of the present invention and a conventional panel-like sound absorbing material may be combined to form a sound absorbing curtain structure as shown in FIG. 3 (b). As the panel-shaped sound absorbing material, any known sound absorbing material such as a porous material such as an ordinary metal sintered material can be used.
When a metal porous material formed by press-bonding a laminate of an aluminum (Al) -based expanded metal and an Al-based metal fiber layer disclosed in Japanese Patent Publication No. 2 is used, a sound absorbing curtain structure having extremely excellent sound absorbing characteristics is obtained. Can be realized. Here, the higher the areal density of the Al-based metal fiber, the better the sound absorbing property of the metal porous material. However, in the present invention, since it is combined with the sound absorbing curtain of the present invention, it is about 550 g / m ² . Even if a metal porous material using an Al-based metal fiber layer having a low surface density is used, good sound absorbing characteristics can be exhibited. Therefore, an inexpensive structure in which the amount of expensive Al-based metal fiber layer used is small can be obtained. The metal porous material will be described in detail later.

The sound absorbing panel of the present invention comprises the sound absorbing curtain 10 of the present invention described above on one or both sides of a known panel material.
Are arranged.

As the panel material used for the sound absorbing panel of the present invention, all known plate-shaped rigid bodies can be used.
Specifically, metal plate, resin plate, wood plate, concrete plate,
Examples thereof include glass plates and porous material panels such as sintered metal materials. 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 of fixing the sound absorbing curtain of the present invention to the panel material using a jig, a fixing member, an adhesive, or the like, and a holding member such as a rail arranged on the panel material are arranged. Then, various known methods of fixing the sheet-like material to the panel material such as a method of fixing (hanging) the sound absorbing curtain of the present invention to the holding member can be used. In addition, when fixing the sound absorbing curtain to the panel material, it is preferable to fix the sound absorbing curtain to the panel material in the form of dots or lines rather than the planar shape as in the case of laminating the cloth materials. The sound absorbing panel of the present invention may be fixedly arranged at the installation place like the conventional sound absorbing material, or may be provided with legs etc. and used as a so-called partition. Further, in the sound absorbing panel of the present invention, the sound absorbing curtain may be able to be stored by winding or folding.

As described above, the sound absorbing curtain of the present invention can be freely folded, wound, shaped and the like 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 into a stretchable bellows shape, and the panel material is composed of a plurality of plate-shaped members arranged in the stretchable direction of the bellows and flexibly connected to each other. Thus, a sound absorbing panel that can be opened and closed (hereinafter, referred to as an openable sound absorbing panel for convenience) may be configured to be foldable and extendable like a so-called accordion curtain (accordion door = folding door). FIG. 5 is a schematic perspective view of such an opening / closing sound absorbing panel, and FIG. 6 (a) is a top view when the opening / closing sound absorbing panel is extended (that is, when the door is closed). Fig. 3 shows a top view of the openable sound absorbing panel when folded (that is, when the door is opened).

Openable sound absorbing panel 3 shown in FIGS. 5 and 6.
0 is a sound absorbing curtain 3 of the present invention in which a panel member 36 is formed by connecting a large number of plate members 32 ... With hinges 34.
8 and 38 are arranged and the panel member 36 and the two sound absorbing curtains 38 are fixed at both ends of the bellows in the expansion / contraction direction (hereinafter referred to as the expansion / contraction direction). In the openable sound absorbing panel 30, a sound absorbing curtain in which cloth materials are laminated (one side or both sides) is particularly preferably used.

As shown in FIG. 6, the panel material 36 is formed by arranging the plate-like materials 32 ... In the expansion / contraction direction and connected by the hinges 34 ... And the hinges 34 .. It is arranged to be. Therefore, FIG.
As shown in (b), the panel member 36 is configured to be alternately foldable for each plate member 32. Further, the sound absorbing curtain 38 is shaped like an expandable bellows.
Therefore, the openable sound absorbing panel 30 of the present invention is shown in FIG.
And as shown in (b), it can be expanded and contracted (folded) like an accordion curtain, and as shown in FIG. 5, it can be easily configured by hanging it from the curtain rail 40 or the like with a known suspender. It is possible to realize a sound absorbing panel that can be opened and closed. Therefore, the openable sound absorbing panel 30 of the present invention can be used in the same manner as an accordion curtain or the like, and can be suitably used as a partition, a room partition, or the like.

There is no particular limitation on the method of shaping the sound absorbing curtain 38 into an expandable and contractible bellows shape, and depending on the material of the mesh sheet 16, the thin film sheet 14 and the cloth material and the like arranged as necessary. A known crease processing method using pressure, heating, etc .; the top side of the bellows on the panel material 36 side (hereinafter,
This is the bottom portion 46, and the opposite top side is the upper portion 48) and is fixed to the panel material 36 by adhesion or string material; a plate-like material according to the folding interval (distance between the bottom portion 46 and the upper portion 48) or A method of arranging a frame etc. so that it can expand and contract like a bellows;
A method of attaching rod-shaped reinforcing materials corresponding to the folding intervals to the sound absorbing curtain 38 so as to expand and contract in a bellows shape according to the folding interval; a method of arranging rod-shaped reinforcing materials on the bottom portion 46 and the upper portion 48; It is possible to use all known methods for forming a sheet-like material into a stretchable bellows shape, such as a method in which a plurality of the above are combined. In addition, even when the sound absorbing curtain 38 is formed into the above-mentioned corrugated shape instead of the bellows shape,
Needless to say, a similar open / close type sound absorbing panel can be realized, and this aspect is also included in the open / close type sound absorbing panel of the present invention.

The method of connecting the panel members 36 is not limited to the hinge 34 in the illustrated example, but may be a flexible sheet member such as a cloth or a resin sheet, a ring member, or the like.
Various known methods can be used in which the plate-shaped members 32 can be alternately folded and the opening / closing sound absorbing panel can be expanded and contracted.

In the openable sound absorbing panel 30 of the illustrated example, as a preferable mode, the expansion and contraction can be performed easily and smoothly, and can be contracted as small as possible.
The width of the plate member 32 in the expansion / contraction direction and the pitch of the bellows of the sound absorbing curtain 38 (the intervals between the vertices) are made substantially the same, and the hinge 34 and the upper portion 48 are aligned in the expansion / contraction direction to form the opening / closing sound absorbing panel 30. I am configuring. The openable sound absorbing panel 30 of the present invention is not limited to the above configuration, and the width of the plate member 32 and the pitch of the bellows of the sound absorbing curtain 38 may be different, or the plate member 32. The panel material may be configured by using a plurality of types of plate-shaped materials having different widths but different widths.

The sound absorbing panel of the present invention, which is a combination of the panel material and the sound absorbing curtain of the present invention, has the excellent sound absorbing characteristics of the sound absorbing curtain of the present invention as described above, and the sound insulation material of the panel material. The characteristics as can 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 applications such as partitioning, room partitioning, and standing.

The second mode of the sound absorbing panel of the present invention is to fix a plurality of the above-mentioned sound absorbing curtains 10 of the present invention to the frame with a gap in the direction of sound wave propagation, and at least one sound absorbing curtain. The basic structure is that the sound absorbing curtain is arranged at an angle. FIG. 7 (a) is a partially cutaway schematic perspective view of an example of the sound absorbing panel of the second aspect of the present invention, and FIG. 7 (b) 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 casing 62 whose one surface is open as a frame body, and the open face of the casing 62 is closed to arrange the first sound absorbing curtain 10a. In addition, the upper and lower surfaces (the upper surface 64 and the bottom surface 66
And a), a beam 68 is bridged in the vicinity of the open surface of the central part in the left-right direction (hereinafter, referred to as the width direction) in the drawing, and a surface facing the open surface on both sides in the width direction of the beam 68 ( Beams 68 and 72 are bridged in the vicinity of the rear surface, and each beam is bridged from the end of the open surface in the width direction and is refracted in a substantially W shape (refracted three times). ) A second sound absorbing curtain 10b is arranged. Here, in the sound absorbing panel 60, since the open surface (hereinafter, referred to as the front surface) is usually arranged toward the sound source, the traveling direction of the sound wave is from the front surface to the back surface.

As mentioned above, the sound absorbing curtain 10 of the present invention.
The (sound absorbing curtain structure) can adjust the sound absorbing characteristics by the distance of the back air layer, the interval between the sound absorbing curtains when a plurality of sound absorbing curtains are provided, and the like. As shown in FIG. 7, the sound absorbing panel 60 has a rectangular parallelepiped casing 6
The sound absorbing curtain 10a is arranged so as to close the front surface of No. 2, 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 other sound absorbing curtains is similar to the case where many sound absorbing materials having various sound absorbing characteristics are combined. As a result of having a sound absorbing characteristic, as will be shown in Examples later, it is possible to exhibit a good sound absorbing characteristic over an extremely wide frequency range.

The second aspect of the sound absorbing panel of the present invention is not limited to the constitution of the illustrated example, and for example, the sound absorbing curtain 10b.
May be linear and may be disposed so as to cross the housing 62 diagonally from the widthwise end of the front surface to the widthwise end of the back surface,
Alternatively, the sound absorbing curtain 10b may be arranged not to have a substantially W shape having three refractions but to have one refraction or two refractions or four refractions or more. Alternatively, the sound absorbing curtain 10a on the front surface side may be arranged obliquely or bent. Furthermore, the sound absorbing curtain 1 to be arranged
The number 0 is not limited to two in the illustrated example, and three or more may be arranged. Further, in the illustrated example, the sound absorbing curtain 10a and the sound absorbing curtain 10b have an angle (the gap changes) in the width direction, but the present invention is not limited to this, and the upper surface 62 to the bottom surface 66 are not limited to this. It may have an angle in the direction to which it goes. 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 sound waves, and at least one sound absorbing curtain (or part thereof) is All configurations are available, which are arranged at an angle to the sound-absorbing curtain of.

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

The sound absorbing panel 60 in the illustrated example has a rectangular parallelepiped casing 62 whose one surface is open, but the present invention is not limited to this, and two opposite surfaces (for example, the front surface in the illustrated example). A frame body (cylindrical body) whose rear surface or the like is open may be used.
The shape of the frame (housing) is not limited to the rectangular parallelepiped shown in the figure, and various shapes such as a cylinder, a cube, and a polygonal pillar can be used. The frame body may be formed of various metal materials such as stainless steel and aluminum, various resins, wood, and the like. In the sound absorbing panel 60, the second
A known sound absorbing material such as glass wool or a metal sintered material may be arranged on the back side of the sound absorbing curtain 10b. Further, when used outdoors, a thin film such as a Teflon sheet having a thickness of about 6 to 20 μm is arranged on the front surface to prevent water or the like from entering the sound absorbing panel 60, and to prevent water and weather resistance. May be improved. Further, in order to improve the mechanical strength such as 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 in the front surface of the casing (frame body). 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 aspect of the sound absorbing panel of the present invention, the gap between the sound absorbing curtains or the distance from the sound absorbing curtain on the back side to the back surface (wall surface or floor surface of the sound absorbing panel grounding place), that is, the air layer is not particularly limited. No, but 30-70
If it is about mm, it is possible to realize a sound absorbing panel having good sound absorbing characteristics. Therefore, the distance from the front surface to the back surface of the sound absorbing panel (that is, the thickness of the sound absorbing panel) is 100.
It is possible to obtain good sound absorption characteristics in the order of mm, and to realize a thin and space-saving sound absorbing panel.

In the second aspect of the sound absorbing panel of the present invention as described above, an aluminum (Al) -based expanded metal and an areal density of 500 g / m ² ~ disclosed in Japanese Patent Publication No. 4-13142 filed by the present applicant. A porous metal material obtained by press-bonding a laminated body with an Al-based metal fiber layer of 3000 g / m ² , and preferably a porous metal material 88 obtained by sandwiching and press-bonding the Al-based metal fiber layer with an expanded aluminum metal 88. Figure 7
It may be arranged on the front surface as shown in (c). Expanded metal is a metal plate in which a large number of linear cuts are made and pulled in a direction substantially perpendicular to the cuts to form an overall mesh. The metal porous material 88 is formed on one side of an Al-based metal fiber layer or A laminated body with Al-based expanded metal arranged on both sides is formed, and this laminated body is 300 kg / c.
The Al-based expanded metal and the Al-based metal fiber can be pressure-bonded and manufactured by pressing or rolling at m ^{2 to} 2000 kg / cm ² .

Both the metal porous material 88 and the sound absorbing panel 60 of the present invention have excellent sound absorbing characteristics. However, as will be shown in Examples later, by combining the two, more excellent sound absorbing characteristics can be obtained. Obtainable. It is also preferable in terms of mechanical strength and weather resistance of the sound absorbing panel 60. Further, as described above, the porous metal material 88 is
The higher the areal density of the 1-based metal fiber, the better the sound absorbing characteristics. 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 low. However, excellent sound absorption characteristics can be obtained.

The method of fixing the metal porous material 88 to the sound absorbing panel 60 is not particularly limited, and any known method of fixing the panel material to the frame (housing) can be used. Also,
The fixed position of the metal porous material 88 is not limited to the front surface in the illustrated example, and may be the back 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 porous metal material 88 may be arranged with a gap. In addition, the metal porous material 8 of the sound absorbing panel 60
In the embodiment using 8, the thin film such as the Teflon sheet may be arranged on the front surface of the metal porous material 88, or may be arranged 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 above in detail, the present invention is not limited to this and various changes and improvements can be made without departing from the scope of the present invention. Of course you can go.

[0069]

EXAMPLES 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) An aluminum foil sheet having a thickness of 7 μm and a mesh-shaped woven fabric made of glass fibers (plain weave, thickness 0.15 mm, 20 mesh = mesh opening 0.84 mm) are made of vinyl chloride. A sound-absorbing curtain having a rupture portion 12 (breakage portion 14a) formed as shown in FIG. The fractured portions 12 are rectangles having a vertical direction of 0.8 mm and a horizontal direction of 0.3 mm in the figure, and are formed at intervals of 5 mm in the vertical direction and 2.4 mm in the horizontal direction.

Sound Absorption Curtain B (Product of the Invention) A sound absorption curtain exactly the same as the sound absorption curtain A except that a 12 μm thick polyvinyl acetate sheet was used as the thin film sheet.

Sound Absorbing Curtain C A sound absorbing curtain in which the broken portion 14a of the sound absorbing curtain A is removed so that the sound absorbing curtain C is in a state as shown in FIG. 2 (c).

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 together along the outer circumference.

Sound Absorption Curtain E (Product of the Present Invention) A sound absorption curtain in which 0.5 mm-thick cotton cloth is laminated on both sides of the sound absorption curtain A, and the edges are sewn together along the outer circumference.

Regarding the above various sound absorbing curtains, the following samples are attached to each of 500, 800, 1000, 1
Normal incident sound absorption coefficient at each frequency [Hz] of 600, 2000 and 2500 (JIS 1405-1963)
Was measured). The results (shown in percentage) are shown in Table 1 below.

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

[0076]

[Table 1]

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

[Embodiment 2] The sound absorbing curtain A of Embodiment 1,
With respect to the sound absorbing curtain C and the sound absorbing curtain E, the vertical layer sound absorption coefficient (JIS 1405
(According to -1963) was measured. 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. Further, it is also advantageous in terms of decoration as described above.

[Example 3] The sound absorbing curtain E of Example 1 was textured (sewn) as shown in Fig. 9, and the sound absorption coefficient in the reverberation room method was measured according to 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.
Shaped to be mm, the distance from the wall to the apex is 6
It was fixed in the reverberation room so that it was 0 mm (that is, the distance from the wall surface to the bottom was 120 mm). The results are shown in FIG. 10. It has an extremely excellent sound absorbing property, and particularly in a region of 500 Hz or more, it exhibits an excellent sound absorbing property of 0.9 (90%) or more in most regions. The reason for this is that, as described above, by forming a wavy shape like an ordinary curtain, the distance from the wall surface to the sound absorbing curtain E changes in a contact manner, so that the sound absorbing efficiency is improved from low frequencies to high frequencies. It is believed that there is.

[Embodiment 4] A mesh-like woven fabric woven from an aluminum foil sheet having a thickness of 20 μm and glass fibers (plain weave, thickness 0.15 mm, about 30 mesh = mesh opening about 0.
6 mm) and a vinyl chloride adhesive, and then the fractured portion 12 (broken portion 14) as shown in FIG.
The sound absorbing curtain of the present invention was produced by forming a) (hereinafter referred to as sound absorbing curtain F). The broken portion 12 is a rectangle having a vertical direction of 0.6 mm and a horizontal direction of 0.35 mm in the figure, and the central portion in the vertical direction is cut by 0.3 mm, and the rest is a broken portion 14a. Further, the formation interval (center interval) of the fractured portions 12 was 6.2 mm in the vertical direction and 3.1 mm in the horizontal direction. The sound absorption coefficient by the vertical incidence method (according to JIS 1405-1963) was measured for the following samples in which the back air layer was variously changed using two such sound absorbing curtains F. <Sample j> The sound absorbing curtain F is fixed by taking an air layer of 10 mm from the bottom surface, and the air layer is 90 mm from the sound absorbing curtain F.
Then, another sound absorbing curtain F was fixed. <Sample k> The sound absorbing curtain F is fixed by taking an air layer of 80 mm from the bottom surface, and the air layer is 20 mm from the sound absorbing curtain F.
Then, another sound absorbing curtain F was fixed. <Sample l> The sound absorbing curtain F is fixed by taking an air layer of 70 mm from the bottom surface, and the air layer is 30 mm from the sound absorbing curtain F.
Then, another sound absorbing curtain F was fixed. <Sample m> The sound absorbing curtain F is fixed by taking an air layer of 60 mm from the bottom surface, and the air layer is 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 air layers are the same (100 mm), different characteristics are obtained because the distance between the two sound absorbing curtains and the distance from the sound absorbing curtain on the bottom side to the bottom are different. It is possible to obtain a sound absorbing curtain structure having When the same experiment was conducted with the total air layer being 80 mm, almost the same result was obtained.

Example 5 Using the sound absorbing curtain F of Example 1, a sound absorbing panel of the second aspect of the present invention as shown in FIG. FIG. 12 shows a schematic view and specifications (unit: mm) of the produced sound absorbing panel. The frame body 82 of the sound absorbing panel 80 is not a rectangular parallelepiped whose one surface is open, but a rectangular tubular shape whose opposite surface is open. Use one
One side to be opened was closed by a sound absorbing curtain F, and this side was made the front side. 12A is a view of the sound absorbing panel 80 as seen from the front side, FIG. 12B is a sectional view taken along the line bb of the sound absorbing panel 80, and the sound absorbing curtain F is indicated by a symbol F. Further, an Al expanded metal 84 was laminated on the front surface of the sound absorbing panel 80 (not shown in FIG. 12A).

Regarding such a sound absorbing panel 80, JI
The reverberation room sound absorption coefficient was measured according to SA 1409-1967. That is, reference numeral 86 in FIG. 12 indicates a floorboard of the reverberation room. The result is shown in (a) of FIG. 13, and it is possible to obtain good sound absorbing characteristics without unevenness over a wide frequency band.

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

[Embodiment 7] Sound absorbing curtain D of Embodiment 1
(A sound absorbing curtain in which a 0.5 mm-thick cotton cloth is further laminated on the sound absorbing curtain A, and the edges are sewn along the outer circumference)
Using, the openable sound absorbing panel 30 shown in FIGS. 5 and 6 was produced. The sound absorbing curtain D was processed into a bellows shape with a pitch of 50 mm and a height (upper height) of 60 mm by folding and sewing. The plate member 32 is an aluminum plate having a thickness of 1.2 mm, which is connected by a hinge 34 to form a panel member 36. The width of the plate member 32 was set to be the same as the pitch of the bellows. The sound transmission loss characteristics of the opening / closing sound absorbing panel 30 were measured according to JIS A1416 1974. The results are shown in Fig. 14 (a). In addition, in FIG. 14B, the results of performing the same measurement only on the panel material 36 are also shown. As shown in FIG. 14, the openable sound absorbing panel 30 of the present invention has a very good sound insulating property due to the 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 in detail above, 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 moreover, it can be hung from a ceiling or the like and installed. It can be easily used in a dead place or a complicated place, and can be easily stored for winding, folding, etc., so that parts such as in the factory or in ships where pipes and wiring are complicated or curved It can be suitably used for a part or a part having a complicated shape, and also for a use which is difficult to use with a conventional panel-shaped sound absorbing material such as a window of a piano room. Further, the sound absorbing panel of the present invention has excellent sound absorbing characteristics utilizing the sound absorbing curtain of the present invention, and is a lightweight and inexpensive sound absorbing panel, which is suitable for various applications such as building materials, partitions and partitions. It can be preferably used.

[Brief description of 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 the method for manufacturing a sound absorbing curtain of the present invention, and FIG. 2B is a schematic cross-sectional view of the sound absorbing curtain shown in FIG. 1 when viewed from another direction. ,
(C) is a sound-absorbing curtain with the breakage removed (comparative product)
FIG.

3 (a) and 3 (b) are views conceptually showing a structural example of the sound absorbing curtain structure of the present invention.

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

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

6 (a) is a top view of the sound absorbing panel shown in FIG. 5 in a stretched state, and FIG. 6 (b) is a top view of the same in a contracted state.

FIG. 7A is a partially cutaway schematic perspective view of an example of the second aspect of the sound absorbing panel of the present invention, FIG. 7B is a schematic cross-sectional view taken along line bb of the same, and FIG. FIG. 6 is a schematic cross-sectional view of another aspect of the aspect of FIG.

FIG. 8 is a graph showing the sound absorption coefficient by the vertical incidence method of the sound absorbing curtain structure of the present invention.

FIG. 9 is a conceptual diagram for explaining a sound absorbing curtain in an example of the present invention.

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

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

FIG. 12 (a) is a schematic view of an embodiment of the second aspect of the sound absorbing panel of the present invention when viewed from the front, and (b) is a schematic cross-sectional view taken along the line bb.

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

FIG. 14 is a graph showing a transmission loss characteristic of the opening / closing sound absorbing panel of the present invention.

[Explanation of symbols]

 10, 38 Sound absorbing curtain 12 Breaking part 14 Thin film sheet 14a Breaking part 16 Mesh 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 part 48 Top 60, 80 Sound absorbing panel 62, 82 Frame 64 Upper surface 66 Bottom 68, 70, 72 Beam 84 Expanded metal 86 Floor plate 88 Metal porous material

Claims (9)

[Claims] 1. A sound-absorbing curtain comprising a flexible mesh sheet and a thin film having a large number of breaks, which are adhered to each other, and the thin film at the breaks can be vibrated by sound waves. 2. A sound absorbing curtain formed by further laminating a cloth on at least one surface of the sound absorbing curtain according to claim 1. 3. The sound absorbing curtain according to claim 1, which is formed in a wavy shape. 4. A sound-absorbing curtain structure comprising one sound-absorbing curtain according to claim 1 or a plurality of sound-absorbing curtains provided with a gap and an air layer provided on a wall surface. 5. A sound absorbing panel comprising the sound absorbing curtain according to claim 1 arranged on one surface or both surfaces of a panel material. 6. The sound absorbing curtain is formed into an expandable and contractible bellows shape, and the panel member is composed of a plurality of plate-like members arranged in the expansion and contraction direction of the bellows and flexibly connected to each other. Sound absorption panel described. 7. A plurality of sound absorbing curtains according to any one of claims 1 to 3 and a frame body for fixing the sound absorbing curtains, wherein the sound absorbing curtains are fixed at intervals in a sound wave traveling direction, A sound absorbing panel, wherein at least one sound absorbing curtain is arranged at an angle with respect to other sound absorbing curtains. 8. The sound absorbing panel according to claim 7, wherein the sound absorbing curtain arranged at the 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 A sound absorbing panel in which a metal porous material is formed by crimping.