JPH1018471A - Sound absorbing material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a sound absorbing material, by which an indoor space is not narrowed, by forming an air chamber by superposing a plate having holes on an uneven molded plate to form a Holmhelz resonator by the holes and the air chamber. SOLUTION: A plate 1 having holes 2 and a molded plate 3 consisting of a thermoplastic resin and molded in an uneven face are superposed on one another, and air chambers 4 are formed between the plate 1 and the molded plate 3. Helmholz resonators 5 are formed by the holes 2 and the air chambers 4. When the sound absorbing material is installed to supporters 6..., superposing surface sections 3a, 3a at places, where the molded plate 3 is brought into contact with the plate 1, are abutted against the supporters 6, and screws 9... are screwed from the reverse surface side of the plate 1 to the supporters 6. Accordingly, since the plate 1 is arranged on the sound source side and the uneven molded plate 3 is not projected to the indoor side, the narrowing of an indoor space 10 is avoided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound absorbing material that absorbs sound according to the Helmholtz resonance theory.

[0002]

2. Description of the Related Art For example, when a sound absorbing material is attached to a ceiling of a room to prevent sound reverberation or soften sound, conventionally,
As shown in FIG. 4, a sound absorbing element b is screwed to a lower surface of a flat plate a constituting a ceiling plate. Therefore, according to this prior art, since the sound absorbing element b protrudes from the lower surface of the ceiling plate to the indoor side, there is a problem that the indoor space c is narrowed. When the flat plate a is a gypsum boat, for example, a screw e for mounting the gypsum board on the support d is screwed into the gypsum board, and a screw (not shown) for mounting the sound absorbing element b on the gypsum board. ) Is screwed into the gypsum board, and many screws are screwed into the gypsum board.

Another prior art is disclosed in Japanese Patent Laid-Open No. 4-225.
As disclosed in Japanese Patent Publication No. 398, there is known a sound absorbing material in which a Helmholtz resonator provided with a hole and an air chamber is provided by laminating a flat plate and an uneven shaped plate. However, in this conventional technique, a hole is provided on the top surface of the uneven molded plate, which is separated from the flat plate, and the uneven molded plate provided with the hole is directed toward the sound source. I have. Therefore, since the uneven shaped plate is attached to the lower surface of the ceiling plate and protrudes to the indoor side,
After all, there is a problem that the indoor space becomes narrow.

[0004]

SUMMARY OF THE INVENTION In view of the above, the present invention has a problem that even when a sound absorbing material is mounted on a wall surface such as a ceiling, the sound absorbing material does not have a portion protruding toward the indoor side, and thus the indoor space becomes narrow. The aim is to provide no sound absorbing material. In addition, it is another object of the present invention to provide a sound absorbing material which does not use many screws when mounting the sound absorbing material on the support, and thus the flat plate is hardly damaged and the construction is easy. In addition, it is another object of the present invention to provide a sound-absorbing material which has a relatively large damping property on the material of an uneven shaped plate and can exhibit a sound-absorbing effect in a relatively wide frequency range.

[0005]

In order to achieve the above object, a sound-absorbing material according to claim 1 of the present invention is characterized in that a flat plate provided with a hole and a molded plate formed in an uneven shape are overlapped with each other. The part and the air chamber formed between the flat plate and the molded plate form a Helmholtz resonator.

According to the sound absorbing material of the present invention, a Helmholtz resonator is formed by a hole provided in a flat plate and an air chamber formed by two plates including the flat plate.

According to a third aspect of the present invention, there is provided the sound absorbing material according to the first aspect, wherein the uneven shaped plate comprises:
An overlaying surface portion that is in contact with a flat plate, wherein when the sound absorbing material provided with the molded plate and the flat plate is mounted on a support, the overlapping surface portion is brought into contact with the support, and an opposite surface of the flat plate is provided. A screw was screwed into the support from the side.

According to a fourth aspect of the present invention, there is provided the sound absorbing material according to the first, second or third aspect, wherein the uneven shaped plate is formed of a thermoplastic resin.

[0009]

In the sound absorbing material according to the first or second aspect of the present invention having the above-described structure, the hole forming the Helmholtz resonator together with the air chamber is provided in a flat plate, not in an uneven shaped plate. Therefore, the flat plate is arranged toward the sound source side, and the uneven shaped plate is arranged on the back surface side of the flat plate. Therefore, when a flat plate is used as a wall surface of a ceiling plate or the like, the uneven shaped plate is disposed behind the ceiling plate and does not protrude indoors, thereby preventing the indoor space from becoming narrow. It is possible to do. The wall surface includes a ceiling or a wall of a building or a ceiling or a wall in a car.

[0010] In addition, in the sound absorbing material according to the third aspect of the present invention having the above structure, when the sound absorbing material is mounted on the support, the overlapping surface portion provided on the uneven shaped plate is provided. Since the screw was screwed into the support from the opposite side of the flat plate by abutting on the support, screwing work was completed simply by screwing in this screw. Furthermore, there is no need to screw a screw into a flat plate. Therefore, since the required number of screws is reduced, the flat plate is less likely to be damaged and the construction is simpler.

In addition to the above, in the sound absorbing material according to the fourth aspect of the present invention having the above-described structure, since the uneven shaped plate is formed of a thermoplastic resin, the thermoplastic resin is formed of, for example, a thermoplastic resin. By utilizing the fact that the resin has greater damping properties than the curable resin, it is possible to exhibit a sound absorbing effect in a relatively wide frequency range.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings.

As shown in FIG. 1, a flat plate 1 provided with a required number of holes 2 and a molded plate 3 provided with a required number of hollow protrusions and formed into an uneven shape are overlapped to form a hole 2. And a required number of Helmholtz resonators 5 are formed by the air chamber 4 formed between the flat plate 1 and the formed plate 3.
Required number of holes 2 provided in the flat plate 1 and the formed plate 3
A required number of Helmholtz resonators 5 are formed by the required number of air chambers 4 formed by the above.

In this embodiment, the flat plate 1 constitutes a ceiling plate, and is formed in a flat shape by a thermoplastic resin as shown in FIG. 2 or by a gypsum board as shown in FIG. ing. In addition, a resonator 5
The number of holes 2 is provided in accordance with the number of holes.

The uneven shaped plate 3 is formed by vacuum forming with a thermoplastic resin. Slope 3c provided between 3b
In the illustrated cross section, the air chamber 4 is surrounded on all sides by the overlapping surface 3a, the top surface 3b, the pair of slopes 3c, and the flat plate 1. The number of the air chambers 4 is provided according to the number of the resonators 5, and each of the air chambers 4 communicates with the outside via the hole 2. This air chamber 4
Have different volumes from each other,
Depending on this volume, sounds in different frequency ranges are absorbed.

The flat plate 1 and the concavo-convex shaped plate 3 are fixed to each other by the ultrasonic welding (FIG. 2) or the bonding (FIG. 3) of the flat surface 1 and the overlapping surface portion 3a by an adhesive. .

In FIG. 1, reference numeral 6 denotes a wooden frame-shaped support suspended and supported by hooks 7 and L-shaped fittings 8, and a flat plate serving as a ceiling plate is provided on the support 6. 1 and an irregular shaped plate 3 are mounted as follows.

That is, the overlapping surface portion 3a provided on the uneven forming plate 3 is brought into contact with the lower surface of the support 6 from below, and in this state, the screw 9 is screwed from the lower surface of the flat plate 1 to the support 6. The flat plate 1 and the formed plate 3 are collectively mounted on the support 6 by being screwed.

The sound-absorbing material having the above configuration has the following functions and effects.

That is, first, since the hole 2 forming the Helmholtz resonator 5 together with the air chamber 4 is provided in the flat plate 1 instead of the uneven shaped plate 3, the flat plate 1 is located on the sound source side. The uneven shaped plate 3 is arranged on the back side of the flat plate 1. Therefore, as shown in the figure, when the flat plate 1 is used as a ceiling plate, the uneven shaped plate 3 is used.
Is disposed above the ceiling plate and does not protrude toward the indoor side, thereby preventing the indoor space 10 from being narrowed. In addition, since the indoor side is a flat surface, the appearance is not impaired.

Second, when the sound absorbing material is mounted on the support 6, the overlapping surface 3a provided on the uneven shaped plate 3 is used.
Is brought into contact with the lower surface of the support member 6 from below, and the screw 9 is screwed into the support member 6 from the lower surface side of the flat plate 1. There is no need to further screw a screw into the flat plate 1 just to mount the uneven shaped plate 3. Therefore, since the required number of screws 9 is reduced, the flat plate 1 is less likely to be damaged and the construction is simpler.

Third, since the uneven shaped plate 3 is formed of a thermoplastic resin, which has a large damping property as compared with, for example, a thermosetting resin, a relatively wide frequency band is formed. A sound absorbing effect is exhibited in the region.

[0023]

The present invention has the following effects.

First, in the sound absorbing material according to claim 1 and the sound absorbing material according to claim 2 of the present invention each having the above-described structure, the hole forming the Helmholtz resonator together with the air chamber is not a molded plate having an uneven shape. Because it is provided on a flat plate, this flat plate is arranged facing the sound source side,
An irregular shaped plate is arranged on the back side of the flat plate. Therefore, when a flat plate is used as a wall surface of a ceiling plate or the like, the uneven shaped plate is disposed behind the ceiling plate and does not protrude indoors, thereby preventing the indoor space from becoming narrow. it can. In addition, since the indoor side is a flat surface, the appearance is not impaired.

In addition to the above, in the sound absorbing material according to the third aspect of the present invention having the above structure, when the sound absorbing material is mounted on the support, the overlapping surface portion provided on the uneven shaped plate is removed. Since the screw was screwed into the support from the opposite side of the flat plate by abutting on the support, screwing work was completed simply by screwing in this screw. Furthermore, there is no need to screw a screw into a flat plate. Therefore, since the required number of screws is reduced, the flat plate is less likely to be damaged and the construction is simpler.

In addition to the above, in the sound absorbing material according to the fourth aspect of the present invention having the above-described structure, the uneven shaped plate is formed of a thermoplastic resin, and the thermoplastic resin is, for example, a thermosetting resin. Since it has a large damping property as compared with the above, a sound absorbing effect is exhibited in a relatively wide frequency range.

[Brief description of the drawings]

FIG. 1 is an essential part cross-sectional view showing a mounted state of a sound absorbing material according to an embodiment of the present invention.

FIG. 2 is a sectional view of a main part of the sound absorbing material according to the embodiment of the present invention.

FIG. 3 is a sectional view of a main part of a sound absorbing material according to another embodiment of the present invention.

FIG. 4 is a cross-sectional view of a main part showing a mounted state of a sound absorbing material according to a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flat plate 2 Hole part 3 Forming plate 3a Overlapping surface part 3b Top surface part 3c Slope part 4 Air chamber 5 Helmholtz resonator 6 Support body 7 Hook 8 Hardware 9 Screw 10 Indoor space

Claims (4)

[Claims] 1. A flat plate (1) provided with a hole (2) and a molded plate (3) formed in an uneven shape are overlapped, and the hole (2), the flat plate (1) and the A sound absorbing material characterized in that a Helmholtz resonator (5) is formed by an air chamber (4) formed between molded plates (3). 2. A hole (2) provided in a flat plate (1),
A Helmholtz resonator (5) formed by an air chamber (4) formed by two plates (1) and (3) including the flat plate (1).
A sound absorbing material comprising: 3. The sound-absorbing material according to claim 1, wherein the uneven shaped plate (3) has a superposed surface portion (3a) in contact with the flat plate (1), and the shaped plate (3) and the flat plate (3) are provided. When the sound-absorbing material provided with 1) is mounted on the support (6), the overlapping surface portion (3a) is brought into contact with the support (6), and the superposed surface portion (3a) is brought into contact with the support (6) from the side opposite to the flat plate (1). A sound-absorbing material, wherein a screw (9) is screwed into a support (6). 4. The sound-absorbing material according to claim 1, wherein the irregular-shaped formed plate (3) is formed of a thermoplastic resin.