Sound absorbing and insulating materials

Abstract

To prevent transmission of sound from both sides.SOLUTION: A sound absorbing and insulating material 10 comprises: a plurality of first concave parts 12 which are formed so as to open on one surface of the sound absorbing and insulating material 10; and a plurality of second concave parts 14 which are formed so as to open on a surface opposite to the one surface of the sound absorbing and insulating material 10. In the sound absorbing and insulating material 10, a bottom part space S1 is provided between a first connection wall 16 for connecting the adjacent first concave parts 12, 12, and a second bottom wall 14b of the second concave part 14 disposed so as to overlap the first connection wall 16.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a sound absorbing / insulating material that prevents the transmission of sound. [Background technology]

[0002] For example, vehicles such as automobiles have power sources such as engines and motors, and various sounds are generated when these are operated. In addition, when a vehicle is running, it also generates sounds such as road noise and wind noise. Therefore, in order to prevent the transmission of sounds from outside the vehicle to the vehicle interior, sound-absorbing materials are arranged on the walls and ceiling of the vehicle interior (for example, see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6670914 Summary of the Invention [Problem to be solved by the invention]

[0004] Although the sound-absorbing material of Patent Document 1 can absorb, for example, sound entering the vehicle interior from outside the vehicle, it cannot adequately prevent sound leakage from the vehicle interior to the outside of the vehicle, such as from an audio system. In addition, the sound-absorbing material of Patent Document 1 has difficulty in reducing noise inside the vehicle interior.

[0005] The present invention has been proposed in view of the above-mentioned problems associated with the conventional technology, and aims to provide a sound-absorbing and insulating material that can prevent sound from passing through from both sides of the material. [Means for solving the problem]

[0006] In order to overcome the above problems and achieve the intended object, the sound absorbing and insulating material according to the present invention comprises: A plurality of first recesses formed so as to open on one surface of the sound absorbing and insulating material; The present invention is characterized in that it has a plurality of second recesses formed so as to open to a surface opposite to the one surface. Effect of the Invention

[0007] The sound absorbing and insulating material according to the present invention can prevent the transmission of both sounds incident from one side of the sound absorbing and insulating material and sounds incident from the other side of the sound absorbing and insulating material. [Brief description of the drawings]

[0008] [Figure 1] 1 is a perspective view showing a part of a sound absorbing and insulating material according to an embodiment of the present invention, in which first connecting walls connecting the first recesses to each other are shown shaded. [Diagram 2] 2 is a cross-sectional view corresponding to the line XX in FIG. 1. [Diagram 3] 2. (a) is an enlarged view of part A in FIG. 2, (b) is an enlarged view of part B in FIG. 2, and (c) is an enlarged view of part C in FIG. [Figure 4] FIG. 11 is a cross-sectional view showing a modified example of the sound absorbing and insulating material. [Diagram 5] FIG. 11 is a cross-sectional view showing a modified example of the sound absorbing and insulating material. [Figure 6] FIG. 11 is a cross-sectional view showing a modified example of the sound absorbing and insulating material. [Figure 7] 1 is an exploded perspective view of a first recess and a second recess, in which a first connecting wall connecting the first recesses is shown shaded, and a second bottom wall of the second recess is shown shaded. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Next, a sound absorbing and insulating material according to the present invention will be described below by way of preferred embodiments with reference to the accompanying drawings. EXAMPLES

[0010] As shown in Fig. 1 and Fig. 2, the sound absorbing and insulating material 10 according to the embodiment includes a plurality of first recesses 12 formed to open on one surface (upper side in the figure) of the sound absorbing and insulating material 10, and a plurality of second recesses 14 formed to open on the surface opposite to the one surface (lower side in the figure) of the sound absorbing and insulating material 10. The first openings 12a of the first recesses 12 arranged in a staggered manner are formed on one surface of the sound absorbing and insulating material 10. The second openings 14a of the second recesses 14 arranged in a staggered manner are formed on the other surface of the sound absorbing and insulating material 10. The sound absorbing and insulating material 10 is formed by combining a first member P1 connecting adjacent first recesses 12 with a first connecting wall (connecting wall) 16 and a second member P2 connecting adjacent second recesses 14 with a second connecting wall (connecting wall) 18 (see Fig. 7). In the embodiment, the first connecting wall 16 is continuous with the open end of the first recess 12, and the second connecting wall 18 is continuous with the open end of the second recess 14. In the sound absorbing and insulating material 10, the second recess 14 is disposed between adjacent first recesses 12, 12, and the first recess 12 is disposed between adjacent second recesses 14, 14 (see FIG. 2). In this way, in the sound absorbing and insulating material 10, the first recesses 12 and the second recesses 14 are disposed alternately.

[0011] As shown in Fig. 2 and Fig. 3(a), the sound absorbing and insulating material 10 has a bottom space (space) S1 between a first connecting wall 16 connecting the adjacent first recesses 12, 12 and a bottom wall 14b of the second recess 14 arranged so as to overlap the first connecting wall 16. Also, as shown in Fig. 2 and Fig. 3(b), the sound absorbing and insulating material 10 has a bottom space (space) S1 between a second connecting wall 18 connecting the adjacent second recesses 14, 14 and a bottom wall 12b of the first recess 12 arranged so as to overlap the second connecting wall 18. Furthermore, as shown in Fig. 2 and Fig. 3(c), a side space (space) S2 is provided between a first side wall (side wall) 12c of the first recess 12 and a second side wall (side wall) 14c of the second recess 14 arranged so as to overlap the first side wall 12c of the first recess 12. In this way, the sound absorbing and insulating material 10 can attenuate sound not only by the double structure of the connecting wall 16 (18) and the bottom wall 12b (14b), but also by reflecting sound in the bottom space S1 to attenuate the sound. Here, the distance between the first connecting wall 16 and the second bottom wall 14b and the distance between the second connecting wall 18 and the first bottom wall 12b may be the same (see Fig. 2, Fig. 3(a) and (b)) or may be different (see Fig. 4(a)). For example, when the distance between the first connecting wall 16 and the second bottom wall 14b and the distance between the second connecting wall 18 and the first bottom wall 12b are different, sounds of different frequency bands can be absorbed and blocked on one side and the opposite side of the sound absorbing and insulating material 10.

[0012] The first recess 12 may be formed such that the bottom side is narrower than the first opening 12a (see FIG. 2), or may be formed with the same opening area from the first opening 12a to the bottom side. In either case, it is acceptable. Note that if the first recess 12 is formed such that the bottom side is narrower than the first opening 12a, it is preferable because the sound incident on the inside of the first recess 12 can be reflected by the first side wall 12c and attenuated. Similarly, the second recess 14 may be formed such that the bottom side is narrower than the second opening 14a (see FIG. 2), or may be formed with the same opening area from the second opening 14a to the bottom side. In either case, it is acceptable. Note that if the second recess 14 is formed such that the bottom side is narrower than the second opening 14a, it is preferable because the sound incident on the inside of the second recess 14 can be reflected by the second side wall 14c and attenuated. For example, even if the hole shape of the first recess 12 is narrower on the bottom side than the first opening 12a while the hole shape of the second recess 14 has the same opening area from the second opening 14a to the bottom side, or even if the hole shapes of the first recess 12 and the second recess 14 are different, the hole shapes of the first recess 12 and the second recess 14 may be the same as in the embodiment. For example, if the hole shapes of the first recess 12 and the second recess 14 are different, sounds in different frequency bands can be absorbed and blocked on one side and the opposite side of the sound absorption and blocking material 10.

[0013] The first opening 12a of the first recess 12 and the second opening 14a of the second recess 14 may have the same opening width (see FIG. 2, W1 = W2), or may be different (see FIG. 4(b), for example, W1 < W2). In either case, it is acceptable. For example, if the opening widths of the first recess 12 and the second recess 14 are different, sounds in different frequency bands can be absorbed and blocked on one side and the opposite side of the sound absorption and blocking material 10.

[0014] The depth from the first opening 12a to the first bottom wall 12b in the first recess 12 and the depth from the second opening 14a to the second bottom wall 14b in the second recess 14 may be the same (see FIG. 2, D1 = D2) or different (see FIG. 4(a), for example, D1 < D2). For example, if the depths of the first recess 12 and the second recess 14 are different, sounds in different frequency bands can be absorbed and blocked on the side opposite to the one side of the sound absorption and blocking material 10. Note that the deeper the recess 12 (14), the more the attenuation effect on the low frequency band side of, for example, 500 Hz or less can be improved.

[0015] It is preferable that the first recess 12 and the second recess 14 are formed of a film because sound can be attenuated by membrane vibration. For example, the first recess 12 and the second recess 14 can be formed of a film about 0.1 mm to 0.5 mm thick. The first recess 12 and the second recess 14 can be formed of materials such as thermoplastic resins and thermosetting resins, but it is preferable to use a thermoplastic resin for ease of molding. Examples of such thermoplastic resins include polyethylene terephthalate (PET) and polypropylene (PP). The first recess 12 and the second recess 14 may be formed of the same material or different materials. For example, if the first recess 12 and the second recess 14 are formed of different materials, sounds in different frequency bands can be absorbed and blocked on the side opposite to the one side of the sound absorption and blocking material 10. Further, by configuring the other recess 14 (12) with a harder or thicker material (for example, PP) than the material (for example, PET) of one recess 12 (14), the rigidity of the entire sound absorption and blocking material 10 can be improved.

[0016] The first member P1 of the embodiment is entirely formed of a single film including a plurality of first recesses 12 and a first connecting wall 16. Similarly, the second member P2 of the embodiment is entirely formed of a single film including a plurality of second recesses 14 and a second connecting wall 18. The first member P1 and the second member P2 can be formed, for example, by vacuum molding of a film. Further, the first member P1 and the second member P2 can be assembled by joining the portions in contact with each other with an adhesive or the like, or by interfering with each other.

[0017] The first bottom wall 12b and the second bottom wall 14b of the sound absorbing and insulating material 10 may be formed as a flat surface (see FIG. 2) or as a curved surface (see FIG. 5(a)). The bottom walls 12b, 14b in FIG. 5(a) have curved surfaces whose central portions protrude toward the opposite side of the opposing connecting walls 18, 16. For example, curving the bottom wall 12b (14b) is preferable because the curved surface can diffusely reflect and attenuate sound that hits the bottom wall 12b (14b).

[0018] In the sound absorbing and insulating material 10, the first connecting wall 16 and the second connecting wall 18 may be formed as a flat surface (see FIG. 2) or as a curved surface (see FIG. 5(b)). The connecting walls 16, 18 in FIG. 5(b) are curved surfaces whose central portions protrude toward the bottom walls 14b, 12b. For example, by curving the connecting wall 16 (18), the sound hitting the connecting wall 16 (18) can be diffusely reflected by the curved surface and attenuated, which is preferable. In addition, the first connecting wall 16 (second connecting wall 18) and the second bottom wall 14b (first bottom wall 12b) may be formed in the same surface shape (see FIG. 2) or in different surface shapes (see FIG. 5). For example, by forming the first connecting wall 16 and the second bottom wall 14b with the same surface shape, while forming the second connecting wall 18 and the first bottom wall 12b with different surface shapes, it is possible to absorb and block sounds of different frequency bands on one side and the opposite side of the sound-absorbing and insulating material 10.

[0019] In the sound absorbing and insulating material 10, the first recess 12 and the second recess 14 may be arranged so that the central axes of the opening 12a (14a) and the bottom wall 12b (14b) are aligned (see FIG. 2), or may be arranged so that the centers of the opening 12a (14a) and the bottom wall 12b (14b) are offset (see FIG. 6). As shown in FIG. 6, by forming the recess 12 (14) so ​​that the centers of the opening 12a (14a) and the bottom wall 12b (14b) are offset, the sound entering from the opening 12a (14a) can be reflected by the inclined side wall 12c (14c) and attenuated.

[0020] The sound absorbing and insulating material 10 can absorb sound from one side where the first recess 12 is open by attenuating the sound through membrane vibration, reflection, etc. of the walls 12b and 12c that constitute the first recess 12. Also, the sound absorbing and insulating material 10 can absorb sound from the opposite side where the second recess 14 is open by attenuating the sound through membrane vibration, reflection, etc. of the walls 14b and 14c that constitute the second recess 14. In this way, the sound absorbing and insulating material 10 can prevent the transmission of both sound incident from one side and sound incident from the opposite side. For example, when the sound absorbing and insulating material 10 is installed on the ceiling of a vehicle such as an automobile, it is possible to prevent external sounds such as rain sounds entering from outside the vehicle from transmitting into the vehicle cabin, and also to prevent indoor sounds such as abnormal noise in the vehicle cabin from transmitting outside the vehicle. Also, the sound absorbing and insulating material 10 absorbs indoor sounds such as audio in the vehicle cabin, and this sound absorbing effect can improve quietness. When the sound absorbing and insulating material 10 is used in a cover such as an engine undercover in a vehicle such as an automobile, it is possible to prevent external sounds such as road noise entering from outside the vehicle from penetrating into the vehicle compartment, and also to prevent sounds emitted from the vehicle side such as engine noise from penetrating outside the vehicle. In addition, since the sound absorbing and insulating material 10 absorbs external sounds such as road noise, this sound absorbing effect can improve quietness.

[0021] The sound absorbing and insulating material 10 may be formed in a flat shape, or may be curved to suit the installation location, etc. The sound absorbing and insulating material 10 may be formed in a curved shape.

[0022] The sound absorbing and insulating material 10 can easily change the opening shape, hole shape, and depth of the recesses 12, 14, the surface shapes of the bottom walls 12b, 14b and the connecting walls 16, 18, the distance between the bottom walls 12b, 14b and the connecting walls 16, 18, the volume of the bottom space S1, the distance between the first side wall 12c and the second side wall 14c, the volume of the side space S2, the material, etc., individually or for a predetermined area, etc., within an arbitrary range. Therefore, the sound absorbing and insulating material 10 can be easily adjusted to the target frequency band of sound, and can exhibit a wide range of sound absorbing and transmission preventing performance.

[0023] In addition, the sound absorbing and insulating material 10 can easily change the opening shape, hole shape, and depth of the recesses 12 and 14, the surface shapes of the bottom walls 12b and 14b and the connecting walls 16 and 18, the distance between the bottom walls 12b and 14b and the connecting walls 16 and 18, the volume of the bottom space S1, the distance between the first side wall 12c and the second side wall 14c, the volume and material of the side space S2, etc., between one side and the other side. Therefore, the sound absorbing and insulating material 10 can appropriately prevent the transmission of sound from the one side by configuring the first recess 12 side according to the frequency band of the sound incident from the one side. The sound absorbing and insulating material 10 can appropriately prevent the transmission of sound from the other side by configuring the second recess 14 side according to the frequency band of the sound incident from the other side, which is different from the frequency band of the sound incident from the one side.

[0024] (Example of change) The present invention is not limited to the above-mentioned items, and may be modified, for example, as follows: It should be noted that the present invention is not limited to the specific descriptions of the examples and the following modified examples. (1) A sound absorbing and insulating material may be formed by combining, for example, three first members with a number of second members different from the number of the first members, for example, one or two. (2) The hole shape, opening shape, opening area, depth, etc. of the recesses may be changed for each member, and the hole shape, opening shape, opening area, depth, etc. of the recesses may be changed within one member. That is, the hole shape, opening shape, opening area, depth, etc. of the recesses may be different for each predetermined region, or the hole shape, opening shape, opening area, depth, etc. of adjacent recesses may be different. (3) The first connecting wall and the second bottom wall do not necessarily have to be entirely separated, and the first connecting wall and the second bottom wall may be partially in contact, or the first connecting wall and the second bottom wall do not have to be in contact entirely with no bottom space. (4) The second connecting wall and the first bottom wall do not necessarily have to be separated as a whole; the second connecting wall and the first bottom wall may be in contact with each other partially, or the second connecting wall and the first bottom wall may be in contact with each other as a whole with no bottom space being left. (5) The first side wall and the second side wall do not necessarily have to be entirely separated from each other. The first side wall and the second side wall may be partially in contact with each other, or the first side wall and the second side wall may be in contact with each other entirely without leaving a side space. (6) The side walls of the recess are not limited to those that extend linearly. For example, the side walls may be curved in an arc or may be curved in a stepped shape. (7) The opening shape of the recess is not limited to a rectangle, and may be, for example, a polygon such as a triangle, a pentagon, or a hexagon, a circle, an ellipse, or the like. [Explanation of symbols]

[0025] 10 sound absorbing and insulating material, 12 first recess, 12a first opening (opening), 12b first bottom wall (bottom wall), 12c first side wall (side wall), 14 second recess, 14a second opening (opening), 14b second bottom wall (bottom wall), 14c second side wall (side wall), 16 1st connecting wall (connecting wall), 18 2nd connecting wall (connecting wall)

Claims

1. A plurality of first recesses formed to open on one surface of a sound absorbing and insulating material; a plurality of second recesses formed so as to open to a surface opposite to the one surface; The first recess and the second recess are formed such that the center of the opening is offset from the center of the bottom wall. A sound absorbing and insulating material characterized by:

2. A sound absorbing and insulating material for a vehicle, comprising: A plurality of first recesses formed so as to open on one surface of the sound absorbing and insulating material; a plurality of second recesses formed so as to open to a surface opposite to the one surface; a space is provided over the entirety between a connecting wall connecting adjacent first recesses and a bottom wall of the second recess arranged to overlap the connecting wall, and a space is provided over the entirety between the connecting wall connecting adjacent second recesses and a bottom wall of the first recess arranged to overlap the connecting wall, The first recess and the second recess are made of a thermoplastic resin selected from polyethylene terephthalate and polypropylene. A sound absorbing and insulating material characterized by:

3. A sound absorbing and insulating material for a vehicle, comprising: A plurality of first recesses formed so as to open on one surface of the sound absorbing and insulating material; a plurality of second recesses formed so as to open to a surface opposite to the one surface; a space is provided over the entirety between a connecting wall connecting adjacent first recesses and a bottom wall of the second recess arranged to overlap the connecting wall, and a space is provided over the entirety between the connecting wall connecting adjacent second recesses and a bottom wall of the first recess arranged to overlap the connecting wall, The first recess and the second recess are formed such that the center of the opening is offset from the center of the bottom wall. A sound absorbing and insulating material characterized by:

4. A plurality of first recesses formed to open on one surface of the sound absorbing and insulating material; a plurality of second recesses formed so as to open to a surface opposite to the one surface; the first recess and the second recess are made of a thermoplastic resin selected from polyethylene terephthalate or polypropylene; The first recess and the second recess are formed such that the center of the opening is offset from the center of the bottom wall. A sound absorbing and insulating material characterized by:

5. A sound absorbing and insulating material for a vehicle, comprising: A plurality of first recesses are formed so as to open on one surface of the sound absorbing and insulating material and are arranged in a staggered pattern; a plurality of second recesses formed to open on a surface opposite to the one surface and arranged in a staggered pattern; A space is provided over the entire area between a connecting wall connecting the adjacent first recesses and a bottom wall of the second recess arranged to overlap the connecting wall, and a space is provided over the entire area between the connecting wall connecting the adjacent second recesses and a bottom wall of the first recess arranged to overlap the connecting wall. A sound absorbing and insulating material characterized by:

6. A plurality of first recesses formed to open on one surface of the sound absorbing and insulating material and arranged in a staggered pattern; a plurality of second recesses formed to open on a surface opposite to the one surface and arranged in a staggered pattern; The first recess and the second recess are formed such that the center of the opening is offset from the center of the bottom wall. A sound absorbing and insulating material characterized by:

7. A sound-absorbing and sound-proofing material described in any one of claims 1 to 6, wherein the first recess and the second recess have different opening areas.

8. An acoustic absorption / proofing material described in any one of claims 1 to 7, wherein the first recess and the second recess have different depths from the opening to the bottom wall.

9. 9. The sound absorbing / insulating material according to claim 1, wherein at least one of a bottom wall of the first recess and a bottom wall of the second recess is curved.

10. 10. The sound absorbing / insulating material according to claim 1, wherein at least one of a connecting wall connecting adjacent first recesses and a connecting wall connecting adjacent second recesses is curved.

11. A plurality of first recesses formed to open on one surface of the sound absorbing and insulating material; a plurality of second recesses formed so as to open to a surface opposite to the one surface; The first recess and the second recess are formed such that a center of the opening and a center of the bottom wall are offset from each other, A space is provided between a side wall of the first recess and a side wall of the second recess arranged so as to overlap the side wall of the first recess. A sound absorbing and insulating material characterized by:

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