JPH11321424A - Sound-shielding structural body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a weight and an occupying volume of a sound-shielding structural body constituting a car and a building structure by laminating one sheet of a plurality of piezoelectric bodies on other piezoelectric bodies in which a polarization direction is different in a thickness direction of other piezoelectric bodies. SOLUTION: A piezoelectric film 4 made of polyvinylidene fluoride of which a plus and minus of polarization is reversed against that of a piezoelectric film 3 in a thickness direction and a piezoelectric film 5 made of polyvinylidene fluoride of which a plus and minus of polarization is reversed against that of the piezoelectric film 4 are laminated between a sound-absorbing material 2 made of a polyurethane foam at the inside of a sound-shielding structural body 1 and the piezoelectric film made of polyvinylidene fluoride. A sound- absorbing material 6 made of a polyurethane foam and a carpet 7 comprised of a carpet front portion 7A and a carpet base portion 7B are laminated on the piezoelectric film 5 in turn. A sound-shielding property can thus be enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound insulation structure for an automobile floor, a sound insulation structure for an automobile dash, and the like.
The present invention relates to a sound insulation structure applied to a sound insulation structure such as a sound insulation wall of various building structures.

[0002]

2. Description of the Related Art Conventionally, as a sound insulation structure in a vehicle such as an automobile, a building structure, etc., a combination of a sound absorbing material and a plate material made of metal or resin has been often used. As a representative example, for example, Japanese Patent Application Laid-Open No. 7-2
As disclosed in Japanese Patent No. 23478, a structure in which a sound absorbing material made of a nonwoven fabric is laminated on a metal panel and a resin backing material is further laminated is mentioned.

[0003] This sound insulating structure has a sound absorbing and sound insulating performance enhanced by the mass effect of a layer of a sound absorbing material and a resin backing material. This mechanism is based on the friction between fibers and air. Heat loss due to
As for the sound insulation performance, it is necessary to eliminate the ventilation and to improve the vibration isolation by the mass.

Accordingly, in order to enhance the sound insulation performance of the above-described structure, it is necessary to increase the density of the sound absorbing material, increase the bulk while keeping the density constant, and increase the density of both of them and increase the bulk. Was needed.

[0005]

However, such a method results in an increase in weight and an occupied volume. Particularly in automobiles, in recent years, there has been a problem of an increase in fuel efficiency due to an increase in weight, and noise insulation materials have been recently developed. This may lead to problems such as a decrease in the cabin space due to an increase in the occupied volume of the vehicle.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and has a weight and an occupancy of a sound insulating structure constituting an automobile, a building structure, etc. without deteriorating sound absorbing performance and sound insulating performance. It is an object of the present invention to provide a high-efficiency sound insulating structure capable of reducing the volume.

[0007]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies on a sound insulating structure in order to solve the above-mentioned problems of the prior art, and as a result, it has been found that the sound absorbing performance and the sound insulating performance can be sufficiently secured by reducing the weight and space. The present invention has been completed by specifying a possible sound insulating structure and a material used for the same.

That is, the sound insulation structure according to the present invention is a structure in which two or more piezoelectric materials having piezoelectricity are laminated on the surface and / or inside as described in claim 1. In addition, at least one of the piezoelectric bodies is laminated with another piezoelectric body in a state where the polarization direction in the thickness direction of the piezoelectric body is different.

[0009] In an embodiment of the sound insulation structure according to the present invention, as described in claim 2, a structure in which two piezoelectric bodies having piezoelectricity on the surface and / or inside are laminated. Wherein the polarization direction in the thickness direction of the piezoelectric bodies is stacked differently between the two piezoelectric bodies.

[0010] Similarly, in an embodiment of the sound insulation structure according to the present invention, as described in claim 3, a structure in which two or more piezoelectric bodies having piezoelectricity are laminated is made of a foam. May be laminated on the surface of a sound absorbing material made of a synthetic material and / or a sound absorbing material made of a fibrous body.

[0011] Similarly, in an embodiment of the sound insulation structure according to the present invention, as described in claim 4, the structure in which two or more piezoelectric materials having piezoelectricity are laminated is made of a foamed material. And / or a sound absorbing material made of a fibrous body.

Similarly, in an embodiment of the sound insulating structure according to the present invention, as described in claim 5, a conductive foam is provided between the laminated piezoelectric bodies. can do.

[0013] Similarly, in an embodiment of the sound insulation structure according to the present invention, as described in claim 6, a cloth such as a woven cloth or a nonwoven cloth made of carbon fiber is interposed between the laminated piezoelectric bodies. It can be assumed that it is.

Similarly, in an embodiment of the sound insulation structure according to the present invention, the piezoelectric body may be a resin film, as described in claim 7.

Similarly, in an embodiment of the sound insulation structure according to the present invention, as described in claim 8, the piezoelectric body may be obtained by subjecting a polyvinylidene fluoride molded body to a poling treatment. .

According to a ninth aspect of the present invention, there is provided a sound insulating structure for a floor of a vehicle, wherein the sound insulating structure is a laminated body including at least a metal panel, a vibration damping material and / or a sound absorbing material, and a carpet. The sound insulation structure according to any one of claims 1 to 8 is laminated at least at one position between the metal panel and the carpet.

Similarly, the sound insulation structure for a floor of a vehicle according to the present invention is a laminated structure comprising at least a metal panel, a vibration damping material and / or a sound absorbing material, and a carpet. In the body, damping material and / or
Alternatively, the sound insulating structure according to any one of claims 1 to 8 is laminated inside the sound absorbing material.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the sound insulation structure according to the present invention will be described below in more detail with reference to the accompanying drawings.

FIG. 1 shows one embodiment of a sound insulation structure according to the present invention.
A sound absorbing material 2 made of polyurethane foam (PUF), a piezoelectric film (A) 3 made of polyvinylidene fluoride (PVDF), and a polyfluorinated film having the same polarity as that of the piezoelectric film (A) 3 except that the polarity in the thickness direction is reversed. A piezoelectric film (B) 4 made of vinylidene (PVDF), and a piezoelectric film (C) 5 made of polyvinylidene fluoride (PVDF) having the same polarity as the piezoelectric film (B) 4 in the thickness direction. Polyurethane foam (PU
F), and a carpet 7 composed of a carpet surface 7A and a carpet base 7B sequentially laminated.

As shown in the embodiment shown in FIG. 1, a laminate of piezoelectric films (A) 3, (B) 4, and (C) 5 in which the polarity in the thickness direction is reversed is a sound insulating structure. By being installed between the sound absorbing materials 2 and 6 inside the body, the electric charge on the surface of the piezoelectric film (A) 3 closer to the base side caused by the vibration input to the sound absorbing material 2 on the base side is reduced. ) Since the positive and negative charges on the surface of the piezoelectric film (A) 3 side of the piezoelectric film (B) 4 in contact with 3 are the same, the piezoelectric film (B) 4
Of the piezoelectric film (B) 4
Since the positive and negative charges on the surface of the piezoelectric film (C) 5 on the side of the piezoelectric film (B) 4 in contact with the piezoelectric film (C) 5 repel each other, the vibration of the piezoelectric film (C) 5 is suppressed. Can be reduced.

FIG. 2 shows another embodiment of the sound insulating structure according to the present invention. The sound insulating structure 1 is composed of a sound absorbing material 2 made of polyurethane foam (PUF) and a polyvinylidene fluoride (PVDF). Made of piezoelectric film (A)
3 and the same polyvinylidene fluoride (PV) having the same polarity as the piezoelectric film (A) 3 in the thickness direction.
A piezoelectric film (B) 4 made of DF), a piezoelectric film (C) 5 made of polyvinylidene fluoride (PVDF) having the same polarity as the piezoelectric film (B) 4 in the thickness direction, and a carpet table. A structure in which a portion 7A and a carpet 7 composed of a carpet base 7B are sequentially laminated.

As shown in the embodiment shown in FIG. 2, a laminate of piezoelectric films (A) 3, (B) 4, and (C) 5 in which the polarity in the thickness direction is reversed is a sound insulation structure. By being installed between the sound absorbing material 2 and the carpet 7 inside the body, the electric charge on the surface of the piezoelectric film (A) 3 close to the sound absorbing material 2 caused by the vibration input to the sound absorbing material 2 is:
The piezoelectric film (B) in contact with the piezoelectric film (A) 3
Since the positive and negative charges of the surface on the side of the piezoelectric film (A) 3 are the same, the repulsion causes the vibration of the piezoelectric film (B) 4 to be suppressed, and the piezoelectric film 4 comes into contact with the piezoelectric film (B) 4. Since the charge on the surface of the film (C) 5 on the side of the piezoelectric film (B) 4 is the same as that of the charge, the repulsion causes the vibration of the piezoelectric film (C) 5 to be suppressed. Sound can be reduced.

FIG. 3 shows still another embodiment of the sound insulation structure according to the present invention.
Are a piezoelectric film (A) 3 made of polyvinylidene fluoride (PVDF), and a piezoelectric film (B) made of polyvinylidene fluoride (PVDF) having the same polarity as the piezoelectric film (A) 3 in the thickness direction. 4)
Polyvinylidene fluoride (PVDF) having the same polarity as that of the piezoelectric film (B) 4 but in the thickness direction,
, A sound absorbing material 6 made of foamed polyurethane (PUF), and a carpet 7 consisting of a carpet surface 7A and a carpet base 7B.

As shown in the embodiment shown in FIG. 3, the laminate of the piezoelectric films (A) 3, (B) 4, and (C) 5 in which the polarity in the thickness direction is reversed is a sound insulating structure. By being installed on the base side of the sound absorbing material 2 inside the body, the electric charge on the surface of the piezoelectric film (A) 3 generated by the vibration input to the piezoelectric film (A) 3 causes the piezoelectric film (A) 3 to be in contact with the piezoelectric film (A) 3. Since the positive and negative charges on the surface of the film (B) 4 on the side of the piezoelectric film (A) 3 are the same, they repel each other, so that the vibration of the piezoelectric film (B) 4 is suppressed, and further, the piezoelectric film (B) Since the positive and negative charges on the surface of the piezoelectric film (C) 5 on the side of the piezoelectric film (B) 4 in contact with the piezoelectric film 4 repel each other, the vibration of the piezoelectric film (C) 5 is suppressed, and as a result, the carpet Arising from 7 It is possible to reduce the sound.

FIG. 4 shows still another embodiment of the sound insulation structure according to the present invention.
Is a sound absorbing material 2 made of foamed polyurethane (PUF);
A piezoelectric film (A) 3 made of polyvinylidene fluoride (PVDF); and a piezoelectric film (B) 4 made of polyvinylidene fluoride (PVDF) having the same polarity as that of the piezoelectric film (A) 3 in the thickness direction. And a sound absorbing material 6 made of polyurethane foam (PUF), and a carpet 7 made of a carpet surface 7A and a carpet base 7B.
Are sequentially laminated.

As shown in the embodiment shown in FIG. 4, the laminate of the piezoelectric films (A) 3 and (B) 4 in which the polarity in the thickness direction is reversed is used as the sound absorbing material inside the sound insulating structure. When the piezoelectric film (A) 3 is disposed between the piezoelectric film (A) 3 and the piezoelectric film (A) 3, the electric charge on the surface of the piezoelectric film (A) 3 closer to the base side due to the vibration input to the sound absorbing material 2 on the base side is brought into contact with the piezoelectric film (A) 3. Since the positive and negative charges on the surface of the film (B) 4 on the side of the piezoelectric film (A) 3 are the same, repulsion causes the vibration of the piezoelectric film (B) 4 to be suppressed. Sound can be reduced.

In the embodiment shown in FIG. 4, since there is only one set of piezoelectric films (A) 3 and (B) 4 having different polarization directions, the sound insulation performance is lower than that of the embodiment shown in FIG. Although it may be inferior, it is possible to provide a very good sound insulation structure economically.

FIG. 5 shows still another embodiment of the sound insulation structure according to the present invention.
Is a sound absorbing material 12 made of polyester (PET) fiber.
A piezoelectric film (A) 3 made of polyvinylidene fluoride (PVDF); and a piezoelectric film (B) made of the same polyvinylidene fluoride (PVDF) having the same polarity as the piezoelectric film (A) 3 in the thickness direction. 4)
It has a structure in which a sound absorbing material 16 made of polyester (PET) fiber and a carpet 7 made of a carpet surface 7A and a carpet base 7B are sequentially laminated.

As shown in the embodiment shown in FIG. 5, the laminate of the piezoelectric films (A) 3 and (B) 4 in which the polarity in the thickness direction is reversed is used as the sound absorbing material inside the sound insulating structure. When the piezoelectric film (A) 3 is disposed between the piezoelectric film (A) 3 and the piezoelectric film (A) 3, the electric charge on the surface of the piezoelectric film (A) 3 which is closer to the base side due to the vibration input to the sound absorbing material 12 on the base side. Since the positive and negative charges on the surface of the film (B) 4 on the side of the piezoelectric film (A) 3 are the same, repulsion causes the vibration of the piezoelectric film (B) 4 to be suppressed. Sound can be reduced, and furthermore, in general, by using a fibrous body that is more excellent in sound absorbing performance than a foam, the sound absorbing properties inside the sound insulating structure can be made more excellent. polarization Different piezoelectric film of direction (A)
Although only one set of 3, (B) 4 is provided, it is possible to provide a sound insulation structure which is very excellent in sound insulation performance.

FIG. 6 shows still another embodiment of the sound insulation structure according to the present invention.
Is a sound absorbing material 12 made of polyester (PET) fiber.
And a piezoelectric film (A) 3 made of polyvinylidene fluoride (PVDF), a conductive foam 18 containing acetylene black as a conductive material, and the polarity of the piezoelectric film (A) 3 in the thickness direction is reversed. Piezoelectric film (B) made of polyvinylidene fluoride (PVDF)
4 and a sound absorbing material 16 made of polyester (PET) fiber
And a carpet 7 composed of a carpet surface 7A and a carpet base 7B.

As shown in the embodiment shown in FIG. 6, the laminate of the piezoelectric films (A) 3 and (B) 4 in which the polarity in the thickness direction is reversed is used as the sound absorbing material inside the sound insulating structure. By placing the piezoelectric film (A) 3 between the base 12 and 16, the electric charge on the surface of the piezoelectric film (A) 3 closer to the base side due to the vibration input to the sound absorbing material 12 on the base side is transmitted through the conductive foam 18. Since the positive and negative charges on the surface of the piezoelectric film (A) 3 side of the piezoelectric film (B) 4 that is in electrical contact with the piezoelectric film (A) 3 are the same, the two repel each other, so that the piezoelectric film (B) 4 Vibration is suppressed, and as a result, the sound generated from the carpet 7 can be reduced. Further, in general, by using a fibrous body having superior sound absorbing performance as a foam as a main sound absorbing material, the inside of the sound insulating structure can be reduced. It is possible to make the sound absorbing characteristics more excellent, so that although there is only one set of the piezoelectric films (A) 3 and (B) 4 having different polarization directions, the sound insulating structure is also very excellent in sound insulating performance. In addition, since the conductive foam 18 is interposed, a double-walled sound insulating structure having a piezoelectric body as a mass and a conductive foam as a spring further enhances sound insulation performance. Can be improved.

FIG. 7 shows still another embodiment of the sound insulation structure according to the present invention.
Is a sound absorbing material 12 made of polyester (PET) fiber.
, A piezoelectric film (A) 3 made of polyvinylidene fluoride (PVDF), a conductive fiber body 19 made of a nonwoven fabric containing carbon fiber as a main component, and positive and negative polarities of the piezoelectric film (A) 3 in the thickness direction. Inverted piezoelectric film made of polyvinylidene fluoride (PVDF) (B)
4 and a sound absorbing material 16 made of polyester (PET) fiber
And a carpet 7 composed of a carpet surface 7A and a carpet base 7B.

As shown in the embodiment shown in FIG. 7, the laminate of the piezoelectric films (A) 3 and (B) 4 in which the polarity in the thickness direction is reversed is used as the sound absorbing material inside the sound insulating structure. By installing the piezoelectric film (A) 3 between the base 12 and 16, the electric charge on the surface of the piezoelectric film (A) 3 closer to the base side caused by the vibration inputted to the sound absorbing material 12 on the base side is mainly composed of conductive carbon fibers. The piezoelectric film (A) 3 of the piezoelectric film (B) 4 which is in electrical contact with the piezoelectric film (A) 3 via the conductive fiber body 19 made of
Since the charge on the side surface is the same as the positive and negative sides, the repulsion causes the vibration of the piezoelectric film (B) 4 to be suppressed, and as a result, the sound generated from the carpet 7 can be reduced. By using only the fibrous body having better sound absorbing performance than the body as the sound absorbing material, the sound absorbing property inside the sound insulating structure can be further improved, and therefore, the piezoelectric film (A) having different polarization directions can be obtained. )
Although there is only one set of 3 and (B) 4, it is possible to provide a sound insulating structure having a very excellent sound insulating performance. As a double-walled sound insulation structure having a body as a mass and a conductive fiber body as a spring, it is possible to further improve the sound insulation performance.

[0034]

According to the sound insulation structure of the present invention, claim 1 is provided.
As described in the above, a structure in which two or more piezoelectric bodies having piezoelectricity are laminated on the surface and / or inside thereof, wherein at least one of the piezoelectric bodies includes another piezoelectric body and the piezoelectric body. Are stacked in a state where the polarization directions in the thickness direction are different from each other, so that the input vibration is efficiently repelled by the repulsive force of electric charges generated between two or more piezoelectric bodies having different polarization directions. A remarkable effect of being able to be suppressed well and providing a sound insulating structure excellent in sound insulating performance is provided.

And, as described in claim 2,
A structure in which two piezoelectric bodies having piezoelectricity are laminated on the surface and / or inside thereof, and the polarization directions in the thickness direction of the piezoelectric bodies are laminated in different states between the two piezoelectric bodies. The input vibration is 2
The output vibration can be suppressed by the repulsive force of the electric charges generated between the piezoelectric bodies having different polarization directions, and it is possible to provide a sound insulation structure excellent in sound insulation performance with a relatively simple configuration. That is a great effect.

According to a third aspect of the present invention, there is provided a structure in which two or more piezoelectric bodies having piezoelectricity are laminated.
By being laminated on the surface of the sound absorbing material made of foam and / or the sound absorbing material made of fiber,
The input vibration can be suppressed by the repulsive force of the electric charge generated between the piezoelectric materials having different polarization directions, and the output vibration can be suppressed, and the sound absorbing material absorbs the input sound. The great effect that a sound insulation structure can be provided is brought about.

Further, as described in claim 4,
When the structure in which two or more piezoelectric bodies having piezoelectricity are laminated is laminated between a sound absorbing material made of a foam and / or a sound absorbing material made of a fibrous body, vibrations inputted The output vibration can be suppressed by the repulsive force of the electric charge generated between the piezoelectric bodies having different polarization directions, and the sound absorbing material absorbs the input sound. The great effect of being able to provide is brought about.

Further, as described in the fifth aspect, by forming a conductive foam inside the stacked piezoelectric bodies, the piezoelectric bodies near the input side are generated. Vibration is suppressed by transmitting the charge through a conductive foam made of a conductive foam and repelling the charge generated in the piezoelectric body near the output side,
It is possible to have a double-walled sound insulation structure using a piezoelectric body as a mass and a conductive foam as a spring, and a very efficient sound insulation using a conductive foam as a sound absorbing material. The great effect that a structure can be provided is brought about.

Further, by forming a cloth made of carbon fiber between the laminated piezoelectric bodies, the electric charge generated in the piezoelectric body near the input side can be obtained. Is transmitted by a woven or non-woven cloth made of conductive carbon fiber to repel the electric charge generated in the piezoelectric body near the output side, thereby suppressing vibration, making the piezoelectric body a mass and using carbon fiber. It is possible to have a double-walled sound insulation structure using a woven or non-woven cloth made of carbon as a spring body, and to use a woven or non-woven cloth made of carbon fiber as a sound absorbing material. A remarkable effect that it is possible to provide a good sound insulation structure.

Furthermore, by making the piezoelectric body a resin film, the piezoelectric body can be made thin because it is made of resin and can be a flexible piezoelectric body. As a result, there is a great effect that the handling of the sound insulating structure is facilitated, and it is possible to provide a sound insulating structure that can increase productivity during an attaching operation or the like.

Further, as described in claim 8, the piezoelectric body is made of a polyvinylidene fluoride molded article (in particular,
By making the film made of a film) subjected to the poling treatment, the resin film becomes advantageous in handling the sound insulating structure, and the polyvinylidene fluoride has a molecular structure. By easily taking on the upper piezoelectricity, a remarkable effect is obtained that the sound insulation efficiency can be improved.

Further, according to a ninth aspect of the present invention, in a laminate comprising at least a metal panel, a vibration damping material and / or a sound absorbing material, and a carpet, the metal panel, the carpet, A floor for a highly efficient vehicle such as an automobile which can reduce the weight and occupied volume of the sound insulating structure by laminating the sound insulating structure according to any one of claims 1 to 8 at at least one place. The great effect that a sound insulation structure can be provided is brought about.

Further, according to the present invention, in a laminate comprising at least a metal panel, a vibration damping material and / or a sound absorbing material, and a carpet,
9. The vibration damping material and / or the sound absorbing material inside the sound absorbing material.
By providing the sound insulation structure according to any one of the above, it is possible to provide a highly efficient sound insulation structure for a floor of a vehicle such as an automobile which can reduce the weight and the occupied volume of the sound insulation structure. Is a great effect.

[0044]

EXAMPLES Examples of the sound insulating structure according to the present invention will be described in detail together with comparative examples, but it goes without saying that the present invention is not limited to only such examples.

In Examples and Comparative Examples of the present invention, the sound insulation characteristics were examined in the following manner. That is,
Sound insulation structures made of various materials were attached to a rectangular test steel plate, and the sound insulation characteristics were evaluated by conducting transmission loss experiments.

In this transmission loss experiment, JIS A141
An experimental device having a shape shown in FIG. 8 which is a reduced shape of the experimental device established in No. 6 was used. This experimental device 21
Two reverberation boxes 22A and 22B, and these two reverberation boxes 2
One reverberation box 22A on one side has a speaker 24 serving as a sound source, and has two reverberation boxes 22A and 22B.
Sound pressure meter 2 for measuring sound pressure in each of A and 22B
5A and 25B are incorporated.

The transmission loss TL (dB) is calculated by
Pressure value (dB) measured by two sound pressure gauges 25A and 25B
Specifically, the sound pressure value I (dB) of the sound source (speaker 24) measured by the sound pressure meter 25A and the sound pressure value of the sound source not having the sound source measured by the sound pressure meter 25B are calculated. O
(DB) is given as Equation 1.

[0048]

[Formula 1] TL (dB) = I (dB) -O (dB)

(Comparative Example 1) FIG. 9 shows a sound insulating structure according to Comparative Example 1 of the present invention.
Is a sound absorbing material 33 made of polyurethane foam (PUF) and a polyethylene (P) on a steel plate 32 of W = 300 mm.
E) a film (A) 34, a film (B) 35 also made of polyethylene (PE), a film (C) 36 also made of polyethylene (PE), and a sound absorbing material 37 made of polyurethane foam (PUF). , A carpet surface portion 38A and a carpet 38 composed of a carpet base portion 38B are sequentially laminated.

Comparative Example 1 having such a structure
In the sound insulation structure 31, a steel plate 32 was installed on the sound source (speaker 24) side of the transmission loss experiment apparatus 21 shown in FIG. 8, and the transmission loss TL was measured using the sound insulation structure 31 as a partition 23. As for TL, the values shown in FIGS.

(Example 1) FIG. 10 shows the structure of a sound insulating structure according to a first embodiment of the present invention.
F) and a polyvinylidene fluoride (PV)
A piezoelectric film (A) 3 made of DF), a piezoelectric film (B) 4 made of polyvinylidene fluoride (PVDF) having the same polarity as that of the piezoelectric film (A) 3 in the thickness direction, and the piezoelectric film (A) 3; Piezoelectric film (C) 5 made of polyvinylidene fluoride (PVDF) with the polarity of the film (B) 4 reversed in the thickness direction
And a sound absorbing material 6 made of polyurethane foam (PUF);
It has a structure in which carpets 7 each composed of a carpet surface 7A and a carpet base 7B are sequentially laminated.

Example 1 having such a structure
8, the steel plate 11 was placed on the sound source (speaker 24) side of the transmission loss test apparatus 21 shown in FIG. 8, and the transmission loss TL was measured using the sound insulation structure 1 as the partition wall 23. The value of TL shown in FIG. 11 was observed, and it was confirmed that the sound insulation performance could be further improved as compared with Comparative Example 1.

(Example 2) FIG. 12 shows the structure of a sound insulating structure according to a second embodiment of the present invention. The sound insulating structure 1 has a foamed polyurethane (PU) on a steel plate 11.
F) and a polyvinylidene fluoride (PV)
A piezoelectric film (A) 3 made of DF), a piezoelectric film (B) 4 made of polyvinylidene fluoride (PVDF) having the same polarity as that of the piezoelectric film (A) 3 in the thickness direction, and the piezoelectric film (A) 3; Piezoelectric film (C) 5 made of polyvinylidene fluoride (PVDF) with the polarity of the film (B) 4 reversed in the thickness direction
And a carpet 7 composed of a carpet surface 7A and a carpet base 7B.

The second embodiment having such a structure
8, the steel plate 11 was placed on the sound source (speaker 24) side of the transmission loss test apparatus 21 shown in FIG. 8, and the transmission loss TL was measured using the sound insulation structure 1 as the partition wall 23. The value of TL shown in FIG. 13 was observed, and it was confirmed that the sound insulation performance could be further improved as compared with Comparative Example 1.

(Embodiment 3) FIG. 14 shows the structure of a sound insulating structure according to a third embodiment of the present invention. This sound insulating structure 1 is made of polyvinylidene fluoride (P) on a steel plate 11.
A piezoelectric film (A) 3 made of VDF), a piezoelectric film (B) 4 made of polyvinylidene fluoride (PVDF) having the same polarity as the piezoelectric film (A) 3 in the thickness direction, and Piezoelectric film (C) 5 made of polyvinylidene fluoride (PVDF) with the polarity of the film (B) 4 reversed in the thickness direction
And a sound absorbing material 6 made of polyurethane foam (PUF);
It has a structure in which a carpet surface 7A and a carpet 7 composed of a carpet base 7B are sequentially laminated.

Example 3 having such a structure
8, the steel plate 11 was placed on the sound source (speaker 24) side of the transmission loss test apparatus 21 shown in FIG. 8, and the transmission loss TL was measured using the sound insulation structure 1 as the partition wall 23. The TL values shown in FIG. 15 were observed, and it was confirmed that the sound insulation performance could be further improved as compared with Comparative Example 1.

(Comparative Example 2) FIG. 16 shows a sound insulating structure according to Comparative Example 2 of the present invention.
1, a sound absorbing material 33 made of foamed polyurethane (PUF), a film (A) 34 made of polyethylene (PE), a film (B) 35 made of polyethylene (PE), and a foamed polyurethane (PU
F) and a carpet 38 composed of a carpet surface 38A and a carpet base 38B are sequentially laminated.

Comparative Example 2 having such a structure
In the sound insulation structure 31, a steel plate 32 was installed on the sound source (speaker 24) side of the transmission loss experiment apparatus 21 shown in FIG. 8, and the transmission loss TL was measured using the sound insulation structure 31 as a partition 23. The TL is shown in FIGS.
The values shown in 24, 26 and 28 were observed.

(Embodiment 4) FIG. 17 shows the structure of a sound insulating structure according to a fourth embodiment of the present invention.
F) and a polyvinylidene fluoride (PV)
DF), a piezoelectric film (B) 4 made of polyvinylidene fluoride (PVDF) having the same polarity as the piezoelectric film (A) 3 in the thickness direction, and a polyurethane foam It has a structure in which a sound absorbing material 6 made of (PUF) and a carpet 7 made of a carpet surface 7A and a carpet base 7B are sequentially laminated.

Embodiment 4 having such a structure
8, the steel plate 11 was placed on the sound source (speaker 24) side of the transmission loss test apparatus 21 shown in FIG. 8, and the transmission loss TL was measured using the sound insulation structure 1 as the partition wall 23. The value of TL shown in FIG. 18 was observed, and it was confirmed that the sound insulation performance could be further improved as compared with Comparative Example 2.

(Embodiment 5) FIG. 19 shows the structure of a sound insulating structure according to a fifth embodiment of the present invention.
F) and a polyvinylidene fluoride (PV)
A piezoelectric film (A) 3 made of DF), a piezoelectric film (B) 4 made of polyvinylidene fluoride (PVDF) having the same polarity as the piezoelectric film (A) 3 in the thickness direction, and a carpet table. It has a structure in which a carpet 7 composed of a portion 7A and a carpet base 7B is sequentially laminated.

Example 5 having such a structure
8, the steel plate 11 was placed on the sound source (speaker 24) side of the transmission loss test apparatus 21 shown in FIG. 8, and the transmission loss TL was measured using the sound insulation structure 1 as the partition wall 23. The values of TL shown in FIG. 20 were observed, and it was confirmed that the sound insulation performance could be further improved as compared with Comparative Example 2.

(Embodiment 6) FIG. 21 shows the structure of a sound insulation structure according to a sixth embodiment of the present invention. This sound insulation structure 1 is made of polyvinylidene fluoride (P) on a steel plate 11.
A piezoelectric film (A) 3 made of VDF), a piezoelectric film (B) 4 made of polyvinylidene fluoride (PVDF) having the same polarity as the piezoelectric film (A) 3 in the thickness direction, and a polyurethane foam It has a structure in which a sound absorbing material 6 made of (PUF) and a carpet 7 made of a carpet surface 7A and a carpet base 7B are sequentially laminated.

Example 6 having such a structure
8, the steel plate 11 was placed on the sound source (speaker 24) side of the transmission loss test apparatus 21 shown in FIG. 8, and the transmission loss TL was measured using the sound insulation structure 1 as the partition wall 23. The value of TL shown in FIG. 22 was observed, and it was confirmed that the sound insulation performance could be further improved as compared with Comparative Example 2.

(Embodiment 7) FIG. 23 shows a structure of a sound insulating structure according to a seventh embodiment of the present invention. This sound insulating structure 1 is made of a polyester (PET) fiber on a steel plate 11. Sound absorbing material 12 and polyvinylidene fluoride (PV
DF), a piezoelectric film (B) 4 made of polyvinylidene fluoride (PVDF) having the same polarity as that of the piezoelectric film (A) 3 in the thickness direction, and a polyester film (A). It has a structure in which a sound absorbing material 16 made of PET (PET) fiber and a carpet 7 made of a carpet surface 7A and a carpet base 7B are sequentially laminated.

Example 7 having such a structure
8, the steel plate 11 was placed on the sound source (speaker 24) side of the transmission loss test apparatus 21 shown in FIG. 8, and the transmission loss TL was measured using the sound insulation structure 1 as the partition wall 23. The value of TL shown in FIG. 24 was observed, and it was confirmed that the sound insulation performance could be further improved as compared with Comparative Example 2.

(Embodiment 8) FIG. 25 shows a structure of an embodiment 8 of a sound insulating structure according to the present invention. The sound insulating structure 1 is made of a polyester (PET) fiber on a steel plate 11. Sound absorbing material 12 and polyvinylidene fluoride (PV
A piezoelectric film (A) 3 made of DF), a conductive foam 18 containing acetylene black as a conductive material, and polyvinylidene fluoride (Polyvinylidene fluoride (P) having the same polarity as that of the piezoelectric film (A) 3 in the thickness direction. It has a structure in which a piezoelectric film (B) 4 made of PVDF), a sound absorbing material 16 made of polyester (PET) fiber, and a carpet 7 made of a carpet surface 7A and a carpet base 7B are sequentially laminated.

Example 8 having such a structure
8, the steel plate 11 was placed on the sound source (speaker 24) side of the transmission loss test apparatus 21 shown in FIG. 8, and the transmission loss TL was measured using the sound insulation structure 1 as the partition wall 23. The value of TL shown in FIG. 26 was observed, and it was confirmed that the sound insulation performance can be further improved as compared with Comparative Example 2.

(Embodiment 9) FIG. 27 shows the structure of a sound insulation structure according to Embodiment 9 of the present invention. This sound insulation structure 1 is made of a polyester (PET) fiber on a steel plate 11. Sound absorbing material 12 and polyvinylidene fluoride (PV
DF), a conductive fibrous body 19 made of a non-woven fabric mainly composed of carbon fiber, and a polyfoil having the same polarity as that of the piezoelectric film (A) 3 except that the polarity in the thickness direction is reversed. A structure in which a piezoelectric film (B) 4 made of vinylidene fluoride (PVDF), a sound absorbing material 16 made of polyester (PET) fiber, and a carpet 7 made of a carpet surface 7A and a carpet base 7B are sequentially laminated. .

Example 9 having such a structure
8, the steel plate 11 was placed on the sound source (speaker 24) side of the transmission loss test apparatus 21 shown in FIG. 8, and the transmission loss TL was measured using the sound insulation structure 1 as the partition wall 23. The value of TL shown in FIG. 28 was observed, and it was confirmed that the sound insulation performance could be further improved as compared with Comparative Example 2.

(Embodiment 10, Comparative Example 3) Next, the results of actual vehicle evaluation of the noise level by attaching a vibration damping member to a body steel plate of an actual vehicle will be described as Example 10 and Comparative Example 3. . The vehicle used here was of AT specification with an engine displacement of 2000 cc, and the noise level was measured at the ear position when the vehicle was running at a constant speed of 2 rpm and the engine speed was 3000 rpm. The level was measured.

First, in the tenth embodiment, similarly to the seventh embodiment shown in FIG. 23, a sound absorbing material 12 made of polyester (PET) fiber is placed on a floor panel (steel plate 11).
A piezoelectric film (A) 3 made of polyvinylidene fluoride (PVDF); and a piezoelectric film (B) made of the same polyvinylidene fluoride (PVDF) having the same polarity as the piezoelectric film (A) 3 in the thickness direction. 4)
A sound absorbing structure 16 made of polyester (PET) fiber and a carpet 7 made up of a carpet surface 7A and a carpet base 7B are sequentially laminated to produce a floor sound insulating structure, and the sound pressure at the ear position is measured by the above-described measuring method. When the level was measured, the value shown in FIG. 29 was observed, and the sound pressure level at the ear position was lower than that in Comparative Example 3.

Next, in Comparative Example 3, similarly to the laminated structure of Comparative Example 2 shown in FIG. 16, a sound absorbing material (3) made of polyester (PET) fiber was placed on a floor panel (steel plate 32).
3) and a film (A) made of polyethylene (PE)
34, a film (B) 35 also made of polyethylene (PE), a sound-absorbing material (37) made of polyester (PET) fiber, and a carpet 38 made of a carpet surface 38A and a carpet base 38B. When the sound insulation structure was manufactured and the sound pressure level at the ear position was measured by the above-described measurement method, the values shown in FIG. 29 were observed, and the sound pressure level at the ear position was higher than that in Example 10. Had become something.

(Reference Example 1) FIG. 30 shows a sound insulation structure according to Reference Example 1. This sound insulation structure 1 has a sound absorbing material 12 made of polyester (PET) fiber, A piezoelectric film (A) 3 made of polyvinylidene fluoride (PVDF); and a piezoelectric film (A) 3 made of polyvinylidene fluoride (PVDF) having the same polarity as the piezoelectric film (A) 3 in the thickness direction. And a sound absorbing material 16 made of polyester (PET) fiber, and a carpet 7 consisting of a carpet surface 7A and a carpet base 7B, which are sequentially laminated.

Reference Example 1 having such a structure
8, the steel plate 11 was placed on the sound source (speaker 24) side of the transmission loss test apparatus 21 shown in FIG. 8, and the transmission loss TL was measured using the sound insulation structure 1 as the partition wall 23. As the TL, the value shown in FIG. 31 was observed.

As is clear from the results shown in FIGS. 24 and 31, in the case of Reference Example 1, the sound insulation performance was superior to that of Comparative Example 2, but was inferior to that of Example 7. It was confirmed that the effect obtained when the direction of polarization in the thickness direction of the piezoelectric material was the same was considerably smaller than that when the layers were stacked with the direction of polarization reversed.

The present invention has been described based on the embodiments. However, the present invention is not limited to the above-described embodiments, and may be modified without departing from the spirit of the present invention. It is. In particular, in the tenth embodiment, the case where the sound insulation structure according to the present invention is a floor structure for an automobile has been described as an example. It is needless to say that the present invention can be applied to other parts of automobiles such as boards, other vehicles, building structures, and the like.

In the above-described embodiment, the case where the surface of the piezoelectric film is untreated is exemplified. However, any other material having piezoelectric characteristics such as a material obtained by evaporating aluminum can be used. .

Further, as for the piezoelectric material, polyvinylidene fluoride (PVDF) can be said to be one of the most desirable ones because of its availability.
In addition to VDF), the effects of the present invention can be exhibited even with vinylidene fluoride, trifluoroethylene copolymer resin, or the like.

[Brief description of the drawings]

FIG. 1 is an explanatory sectional view showing a configuration of a sound insulation structure according to an embodiment of the present invention.

FIG. 2 is an explanatory cross-sectional view showing a configuration of another embodiment of the sound insulating structure according to the present invention.

FIG. 3 is an explanatory sectional view showing a configuration of a sound insulation structure according to still another embodiment of the present invention.

FIG. 4 is an explanatory cross-sectional view showing a configuration of a sound insulation structure according to still another embodiment of the present invention.

FIG. 5 is an explanatory sectional view showing a configuration of a sound insulation structure according to still another embodiment of the present invention.

FIG. 6 is an explanatory cross-sectional view showing a configuration of a sound insulation structure according to still another embodiment of the present invention.

FIG. 7 is an explanatory sectional view showing a configuration of a sound insulation structure according to still another embodiment of the present invention.

FIG. 8 is an explanatory plan view showing an outline of an experimental apparatus used for a transmission loss experiment.

9A and 9B are a cross-sectional explanatory view (FIG. 9A) and an enlarged cross-sectional description (FIG. 9B) showing the configuration of the sound insulating structure according to Comparative Example 1 of the present invention.

10A and 10B are a cross-sectional explanatory view (FIG. 10A) and an enlarged cross-sectional description (FIG. 10B) showing the configuration of the sound insulating structure according to the first embodiment of the present invention.

FIG. 11 is a graph showing the sound insulation characteristics obtained in Example 1 together with Comparative Example 1.

12A and 12B are a cross-sectional explanatory view (FIG. 12A) and an enlarged cross-sectional description (FIG. 12B) showing the configuration of the sound insulating structure according to the second embodiment of the present invention.

FIG. 13 is a graph showing the sound insulation degree characteristics obtained in Example 2 together with Comparative Example 1.

14A and 14B are a cross-sectional explanatory view (FIG. 14A) and an enlarged cross-sectional description (FIG. 14B) showing the configuration of the sound insulating structure according to the third embodiment of the present invention.

FIG. 15 is a graph showing the sound insulation degree characteristics obtained in Example 3 together with Comparative Example 1.

16A and 16B are a cross-sectional explanatory view (FIG. 16A) and an enlarged cross-sectional description (FIG. 16B) showing the configuration of the sound insulation structure according to Comparative Example 2 of the present invention.

17A and 17B are a cross-sectional explanatory diagram (FIG. 17A) and an enlarged cross-sectional description (FIG. 17B) illustrating a configuration of a sound insulating structure according to a fourth embodiment of the present invention.

FIG. 18 is a graph showing the sound insulation degree characteristics obtained in Example 4 together with Comparative Example 2.

19A and 19B are an explanatory cross-sectional view (FIG. 19A) and an enlarged cross-sectional explanation (FIG. 19B) showing the configuration of the sound insulating structure according to the fifth embodiment of the present invention.

FIG. 20 is a graph showing the sound insulation degree characteristics obtained in Example 5 together with Comparative Example 2.

21A and 21B are a cross-sectional explanatory view (FIG. 21A) and an enlarged cross-sectional description (FIG. 21B) showing the configuration of the sound insulating structure according to the sixth embodiment of the present invention.

FIG. 22 is a graph showing the sound insulation characteristics obtained in Example 6 together with Comparative Example 2.

23A and 23B are an explanatory sectional view (FIG. 23A) and an enlarged sectional view (FIG. 23B) showing the configuration of the sound insulating structure according to the seventh embodiment of the present invention.

24 is a graph showing the sound insulation degree characteristics obtained in Example 7 together with Comparative Example 2. FIG.

25A and 25B are a cross-sectional explanatory view (FIG. 25A) and an enlarged cross-sectional description (FIG. 25B) showing the configuration of the sound insulating structure according to the eighth embodiment of the present invention.

FIG. 26 is a graph showing the sound insulation degree characteristics obtained in Example 8 together with Comparative Example 2.

27A and 27B are a cross-sectional explanatory view (FIG. 27A) and an enlarged cross-sectional description (FIG. 27B) showing the configuration of the sound insulating structure according to the ninth embodiment of the present invention.

FIG. 28 is a graph showing the sound insulation degree characteristics obtained in Example 9 together with Comparative Example 2.

FIG. 29 is a graph showing the result of measuring the sound insulation performance obtained in Example 10 at the sound pressure level at the ear together with Comparative Example 3.

30 is a cross-sectional explanatory view ((A) of FIG. 30) showing the configuration of the sound insulating structure according to Reference Example 1 and an enlarged cross-sectional description (FIG. 30).
(B)).

FIG. 31 is a graph of sound insulation degree characteristics comparing Reference Example 1 and Example 7.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 sound insulation structure 2 sound absorbing material made of foamed polyurethane (PUF) 3 piezoelectric film (A) made of polyvinylidene fluoride (PVDF) 4 Piezoelectric film (B) made of PVDF) 5 Piezoelectric film (C) made of polyvinylidene fluoride (PVDF) whose polarity in the thickness direction is opposite to that of piezoelectric film (B) 6 Sound absorbing material made of polyurethane foam (PUF) Reference Signs List 7 carpet 7A carpet front part 7B carpet base 11 steel sheet 12 sound absorbing material made of polyester (PET) fiber 16 sound absorbing material made of polyester (PET) fiber 18 conductive foam 19 conductive fiber body mainly composed of carbon fiber

Claims (10)

[Claims] 1. A structure in which two or more piezoelectric bodies having a piezoelectric property are laminated on a surface and / or an inside thereof, wherein at least one of the piezoelectric bodies has another piezoelectric body and a thickness of the piezoelectric body. A sound insulation structure characterized by being stacked in a state where polarization directions in directions are different. 2. A structure in which two piezoelectric materials having piezoelectricity are laminated on the surface and / or inside thereof, wherein the polarization direction in the thickness direction of the piezoelectric materials is different between the two piezoelectric materials. The sound insulation structure according to claim 1, wherein the sound insulation structure is laminated. 3. A structure in which two or more piezoelectric materials having a piezoelectric property are laminated on a surface of a sound absorbing material made of a foam and / or a sound absorbing material made of a fibrous body. The sound insulation structure according to claim 1. 4. A structure in which two or more piezoelectric bodies having a piezoelectric property are laminated is laminated between a sound absorbing material made of a foam and / or a sound absorbing material made of a fibrous body. The sound insulation structure according to claim 1. 5. The sound insulation structure according to claim 1, wherein a conductive foam is provided between the stacked piezoelectric bodies. 6. The sound insulation structure according to claim 1, wherein a cloth made of carbon fibers is provided between the laminated piezoelectric bodies. 7. The sound insulation structure according to claim 1, wherein the piezoelectric body is a resin film. 8. The sound insulation structure according to claim 1, wherein the piezoelectric body is obtained by subjecting a polyvinylidene fluoride molded body to a poling treatment. 9. A laminate comprising at least a metal panel, a vibration-damping material and / or a sound-absorbing material, and a carpet which are laminated, at least one portion between the metal panel and the carpet. A sound insulation structure for a vehicle floor, wherein the sound insulation structure according to any one of the above items is laminated. 10. The laminate according to claim 1, wherein the metal panel, the vibration damping material and / or the sound absorbing material, and the carpet are laminated at least inside the vibration damping material and / or the sound absorbing material. A sound insulation structure for a floor of a vehicle, wherein the sound insulation structures are laminated.