Soundproof structure and manufacturing method thereof, and mobile body

Abstract

To provide a soundproof structure capable of achieving excellent soundproof performance, a manufacturing method thereof, and a mobile body.SOLUTION: A soundproof structure includes a support member having a plurality of openings partitioned by ribs, a first membrane that covers the support member from one surface side, and a second membrane that covers the support member from the other surface side opposite to the one surface side. The first membrane and the second membrane are in close contact with the ribs, respectively. In each of the plurality of openings, the first membrane and the second membrane are in close contact with each other.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a soundproof structure, a method for manufacturing the same, and a moving body. [Background technology]

[0002] Expanded metal is a product made by cutting staggered slits into a metal plate made of stainless steel, aluminum, iron, or the like, and then expanding the slits to form a mesh. A device in which expanded metal is coated with a resin is known (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-59585 Summary of the Invention [Problem to be solved by the invention]

[0004] In expanded metal, the surface to be coated with resin has steps. This makes it easy for gaps to form between the resin and the surface to be coated. When manufacturing acoustic metamaterials using expanded metal as a base material, if gaps exist between the expanded metal and the resin, the desired soundproofing performance may not be achieved.

[0005] The present invention has been made in view of the above circumstances, and has an object to provide a soundproof structure that can achieve excellent soundproofing performance, a manufacturing method thereof, and a moving body. [Means for solving the problem]

[0006] A soundproof structure according to one aspect of the present invention includes a support member, a first film covering one side of the support member, and a second film covering the other side of the support member opposite the one side. The first film and the second film are in close contact with the support member. The first film and the second film are in close contact with each other at each of a plurality of openings in the support member.

[0007] A method for manufacturing a soundproof structure according to one aspect of the present invention includes placing a first film on one side of a support member and a second film on the other side of the support member, and reducing the pressure between the first and second films to bring the first and second films into close contact with the support member and also to bring the first and second films into close contact with each other at openings in the support member. [Effects of the Invention]

[0008] According to one aspect of the present invention, it is possible to provide a soundproof structure that can achieve excellent soundproofing performance, a method for manufacturing the same, and a moving body. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a plan view showing an example of the configuration of a sheet-like soundproof structure according to an embodiment of the present invention. [Figure 2] FIG. 2 is an enlarged perspective view of a part of the support member according to the embodiment of the present invention. [Figure 3] FIG. 3 is a cross-sectional view of the support member shown in FIG. 2 taken along line AA'. [Figure 4] FIG. 4 is a cross-sectional view showing a first resin film covering the support member from the front surface side and a second resin film covering the support member from the back surface side. [Figure 5] FIG. 5 is a cross-sectional view showing a method for manufacturing a sheet-like soundproof structure according to an embodiment of the present invention (Example 1) in the order of steps. [Figure 6] FIG. 6 is a cross-sectional view showing a method for manufacturing a sheet-like soundproof structure according to an embodiment of the present invention (Example 2). [Figure 7] FIG. 7 is a cross-sectional view showing another method (Example 3) for producing a sheet-like soundproof structure according to an embodiment of the present invention. [Figure 8] FIG. 8 is a plan view showing an example of the configuration of a sheet-like soundproof structure manufactured by the manufacturing method shown in FIG. [Figure 9] FIG. 9 is a cross-sectional view showing an example of the configuration of the sheet-like soundproof structure according to the first embodiment of the present invention. [Figure 10] FIG. 10 is a cross-sectional view showing an example of the configuration of a sheet-like soundproof structure according to Example 2 of the present invention. [Figure 11] FIG. 11 is a cross-sectional view showing an example of the configuration of a sheet-like soundproof structure according to Example 3 of the present invention. [Figure 12] FIG. 12 is a cross-sectional view showing an example of the configuration of a sheet-like soundproof structure according to Example 4 of the present invention. [Figure 13] Fifth Embodiment FIG. 13 is a cross-sectional view showing an example of the configuration of a sheet-like soundproof structure according to a fifth embodiment of the present invention. [Figure 14] FIG. 14 is a graph showing the results of measuring the insertion loss of the sheet-like soundproof structure according to Example 1. [Figure 15] FIG. 15 is a graph showing the results of measuring the insertion loss of the sheet-like soundproof structure according to Example 2. [Figure 16] FIG. 16 is a graph showing the results of measuring the insertion loss of the sheet-like soundproof structure according to Example 3. [Figure 17] FIG. 17 is a graph showing the results of measuring the insertion loss of the sheet-like soundproof structure according to Example 4. [Figure 18] FIG. 18 is a graph showing the results of measuring the insertion loss of the sheet-like soundproof structure according to Example 5. [Figure 19] FIG. 19 is a diagram schematically illustrating a configuration example of a moving body according to an application example of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings referred to in the following description, the same or similar parts are denoted by the same or similar reference numerals. However, it should be noted that the drawings are schematic, and the relationship between thickness and planar dimensions, the thickness ratio of each layer, etc. may differ from the actual ones.

[0011] In the following description, directions may be described using the terms X-axis direction, Y-axis direction, and Z-axis direction. The Z-axis direction is the thickness direction of the support member 2. The X-axis direction and Y-axis direction are directions in which the multiple openings 22 are aligned, and are also directions perpendicular to the thickness direction of the support member 2.

[0012] (Configuration example) FIG. 1 is a plan view showing an example of the configuration of a sheet-like soundproof structure 1 according to an embodiment of the present invention (an example of a "soundproof structure" according to the present invention). FIG. 2 is an enlarged perspective view showing a portion of a support member 2 according to an embodiment of the present invention. FIG. 3 is a cross-sectional view of the support member 2 shown in FIG. 2, taken along line AA'. FIG. 4 is a cross-sectional view showing a first resin film 3 (an example of a "first film" according to the present invention) covering the support member 2 from the front surface 2a (an example of a "one surface" according to the present invention) side, and a second resin film 4 (an example of a "second film" according to the present invention) covering the support member 2 from the back surface 2b side.

[0013] As shown in Figures 1 to 4, the sheet-like soundproof structure 1 includes a support member 2 having a plurality of openings 22 defined by crosspieces 21, a first resin film 3 covering the support member 2 from the front surface 2a side, and a second resin film 4 covering the support member 2 from the back surface 2b side opposite the front surface 2a. The first resin film 3 and the second resin film 4 are in close contact with the crosspieces 21. In each of the plurality of openings 22, the first resin film 3 and the second resin film 4 are in close contact with each other. Each of the components constituting the sheet-like soundproof structure 1 will be described in detail below.

[0014] The support member 2 has a plurality of openings 22 penetrating the support member 2 in a thickness direction (for example, the Z-axis direction). As shown in Fig. 1, the plurality of openings 22 each have the same shape and size in a plan view from the Z-axis direction. The plurality of openings 22 are arranged at equal intervals in the X-axis direction (an example of the "first direction" of the present invention) and the Y-axis direction (an example of the "second direction" of the present invention).

[0015] The support member 2 is, for example, an expanded metal or an expanded metal-like mesh member. Expanded metal is a member made by cutting staggered slits in a metal plate made of, for example, stainless steel, aluminum, or iron, and then expanding the slits to form a mesh. Alternatively, the support member 2 may be a wire mesh or a wire mesh-like mesh member. Expanded metal or expanded metal-like mesh members, or wire mesh or wire mesh-like mesh members, are generally relatively inexpensive because the materials are easily available, easy to process, and can be mass-produced. The support member 2 has a bending rigidity greater than that of the resin film (hereinafter also referred to as a sheet) 5 consisting of the first resin film 3 and the second resin film 4.

[0016] The material constituting the support member 2 is not limited to metals such as stainless steel, iron, or aluminum, and may be, for example, plastic. The plastic support member 2 can be manufactured by, for example, an expanding method involving heating.

[0017] As shown in FIG. 3, the support member 2 has, for example, unevenness on each of the front surface 2a and the back surface 2b. The support member has a step G1 (an example of a "first step" in the present invention) on the front surface 2a of the crosspiece 21, and a step G2 (an example of a "second step" in the present invention) on the back surface 2b of the crosspiece 21. More specifically, the support member 2 has protrusions 23 at the intersections of the crosspieces 21 that form a large number of diamond shapes. The protrusions 23 are formed on both the front surface 2a and the back surface 2b of the support member 2. On the front surface 2a of the support member 2, a step G1 is formed between the protrusions 23 and the crosspiece 21. On the back surface 2b of the support member 2, a step G2 is formed between the protrusions 23 and the crosspiece 21.

[0018] The first resin film 3 is a sheet made of elastic resin, such as a polyethylene film. The first resin film 3 is not limited to polyethylene and may be made of an elastic resin other than polyethylene. Alternatively, the first resin film 3 may be made of synthetic rubber or the like.

[0019] Similarly, the second resin film 4 is a sheet made of elastic resin, such as a polyethylene film. The second resin film 4 is not limited to polyethylene and may be made of an elastic resin other than polyethylene. Alternatively, the second resin film 4 may be made of synthetic rubber or the like.

[0020] The first resin film 3 and the second resin film 4 may be made of the same material or different materials, and may have the same film thickness or different film thicknesses.

[0021] As shown in FIG. 4, the first resin film 3 is disposed on the front surface 2a side of the support member 2, and is provided in close contact with the crosspiece 21 along the step G1. The second resin film 4 is disposed on the back surface 2b side of the support member 2, and is provided in close contact with the crosspiece 21 along the step G2. The first resin film 3 and the second resin film 4 are in close contact with each other at each of the multiple openings 22 of the support member 2. The space between the first resin film 3 and the second resin film 4 is in a lower pressure environment than the outside (external world) between the first resin film 3 and the second resin film 4. As a result, the sheet-like soundproof structure 1 can achieve excellent soundproofing performance, as shown in FIGS. 14 to 18, which will be described later.

[0022] The mechanism by which the sheet-like soundproof structure 1 having the above configuration achieves excellent soundproofing performance is not completely clear, and without being bound by any theory, the following mechanism is speculated. That is, with the above configuration, the resin film (i.e., sheet) 5 consisting of the first resin film 3 and the second resin film 4 is supported by the support member 2 and is partitioned into multiple partitions 51 by the crosspieces 21 of the support member 2. Each of the partitions 51 partitioned into the sheet 5 is planar, and the entire periphery of each partition 51 is in close contact with the crosspieces 21. This makes it possible to ensure that the surface rigidity of the sheet 5 in each partition 51 and the resonance frequency of the sheet-like soundproof structure 1 are within a preferred range. It is believed that sound insulation performance is improved near the resonance frequency of the sheet-like soundproof structure 1, thereby achieving improved soundproofing performance.

[0023] (Manufacturing method) 5 is a cross-sectional view showing a manufacturing method (Example 1) of a sheet-like soundproof structure 1 according to an embodiment of the present invention in the order of steps. As shown in step ST1 of FIG. 5, a support member 2 having a plurality of openings 22 defined by crosspieces 21 is prepared. The front surface 2a of the support member 2 is covered with a first resin film 3, and the back surface 2b of the support member 2 is covered with a second resin film 4.

[0024] Next, as shown in step ST2 of Fig. 5, the pressure between the first resin film 3 and the second resin film 4 is reduced. By continuing this reduction in pressure, as shown in step ST3 of Fig. 5, the first resin film 3 and the crosspiece 21 are brought into close contact with each other, and the second resin film 4 and the crosspiece 21 are brought into close contact with each other, and the first resin film 3 and the second resin film 4 are brought into close contact with each other at each of the plurality of openings 22. During this reduction in pressure and adhesion process, heat may be applied to the first resin film 3 and the second resin film 4 to soften them.

[0025] Thereafter, for example, the outer periphery of the sheet 5 made of the first resin film 3 and the second resin film 4 is sealed so as to prevent air from getting between the first resin film 3 and the second resin film 4. Through the above steps, the sheet-like soundproof structure 1 is completed.

[0026] Fig. 6 is a cross-sectional view showing a manufacturing method (Example 2) of a sheet-like soundproof structure 1 according to an embodiment of the present invention. As shown in Fig. 6, the sheet-like soundproof structure 1 may have an adhesive layer 6 interposed between the first resin film 3 and the second resin film 4. This makes it possible to increase the bonding strength between the first resin film 3 and the second resin film 4 compared to when bonding between the first resin film 3 and the second resin film 4 is achieved by decompression alone.

[0027] For example, as shown in FIG. 11 (to be described later), an adhesive layer 6 may be provided in advance on the surface of the first resin film 3 facing the second resin film 4 (the bottom surface in FIG. 11). Alternatively, as shown in FIG. 12 (to be described later), an adhesive layer 6 may be provided in advance not only on the first resin film 3 but also on the surface of the second resin film 4 facing the first resin film 3 (the top surface in FIG. 12). Alternatively, as shown in FIG. 13 (to be described later), an adhesive to form the adhesive layer 6 may be applied in advance to the crosspiece 21 of the support member 2. This can increase the bonding strength between the first and second resin films 3 and 4 and the crosspiece 21, as well as the bonding strength between the first and second resin films 3 and 4 at each of the multiple openings 22 (see, for example, FIGS. 2 and 3).

[0028] Fig. 7 is a cross-sectional view showing another manufacturing method (Example 3) of the sheet-like soundproof structure 1 according to the embodiment of the present invention. Fig. 8 is a plan view showing a configuration example of a sheet-like soundproof structure 1A (an example of the "soundproof structure" of the present invention) manufactured by the manufacturing method shown in Fig. 7.

[0029] As shown in Figure 7, in an embodiment of the present invention, a portion of the first resin film 3 and a portion of the second resin film 4 may be connected in advance. For example, the first resin film 3 and the second resin film 4 may form a bag-shaped member 7. The support member 2 is placed inside the bag-shaped member 7. Next, the pressure inside the bag-shaped member 7 is reduced to tightly contact the bag-shaped member 7 and the crosspiece 21 of the support member 2, and the first resin film 3 and the second resin film 4 (forming the bag-shaped member 7) are tightly contacted at each of the multiple openings 22. Then, in this state, the opening portion 71 of the bag-shaped member 7 is closed using means such as thermocompression bonding or an adhesive.

[0030] This completes the sheet-like soundproof structure 1A in which the inside of the bag-like member 7 is sealed with the support member 2 disposed inside the bag-like member 7, as shown in Fig. 8. In the sheet-like soundproof structure 1A shown in Fig. 8, the openable portion 71 is closed with the inside of the bag-like member 7 decompressed.

[0031] (Example) Next, with reference to Figs. 9 to 18, the structure of the sheet-like soundproof structure according to each example of the present invention and the evaluation results of the soundproofing performance of each example will be shown.

[0032] (1) Example 1 Fig. 9 is a cross-sectional view showing an example of the configuration of a sheet-like soundproof structure 1B according to Example 1 of the present invention. As shown in Fig. 9, the sheet-like soundproof structure 1B according to Example 1 includes a support member 2, a first resin film 3 covering the support member 2 from the front surface 2a side, and a second resin film 4 covering the support member 2 from the back surface 2b side. As with the above-described sheet-like soundproof structures 1 and 1A, in the sheet-like soundproof structure 1B according to Example 1, the first resin film 3 and the second resin film 4 are each in close contact with the crosspiece 21 of the support member 2. Furthermore, in each of a plurality of openings 22 (see Fig. 2, for example) that the support member 2 has, the first resin film 3 and the second resin film 4 are in close contact with each other.

[0033] In the sheet-like soundproof structure 1B, the film thickness T3 of the first resin film 3 and the film thickness T4 of the second resin film 4 are the same (T3 = T4). There is no adhesive layer between the first resin film 3 and the support member 2. The first resin film 3 and the support member 2 are in direct contact with each other. Similarly, there is no adhesive layer between the second resin film 4 and the support member 2. The second resin film 4 and the support member 2 are in direct contact with each other.

[0034] Fig. 14 is a graph showing the results of measuring the insertion loss (soundproofing performance) in the frequency band of 400 to 4000 Hz for the sheet-like soundproofing structure 1B according to Example 1. The dashed line graph in Fig. 14 (and Figs. 16 to 18 described later) shows the insertion loss estimated from the surface density of the sheet-like soundproofing structure 1B according to Example 1, assuming that the soundproofing performance is exhibited in accordance with only the mass law.

[0035] 14, it was observed that in Example 1, a frequency band exhibiting a higher insertion loss than the mass law exists in a frequency band where sound insulation performance is desired (for example, the road noise region of about 500 Hz to about 1000 Hz). From this result, it was confirmed that the sheet-like soundproof structure 1B according to Example 1 has excellent sound insulation performance against sounds in the frequency band where sound insulation performance is desired.

[0036] (2) Example 2 Fig. 10 is a cross-sectional view showing an example of the configuration of a sheet-like soundproof structure 1C according to Example 2 of the present invention. The sheet-like soundproof structure 1C according to Example 2 shown in Fig. 10 differs structurally from the sheet-like soundproof structure 1B according to Example 1 in the thickness of the first resin film 3. In Example 2, the film thickness T3 of the first resin film 3 is twice as thick as in Example 1. Other configurations of Example 2 are the same as those of Example 1.

[0037] Fig. 15 is a graph showing the results of measuring the insertion loss of the sheet-like soundproof structure 1C of Example 2. The dashed line graph in Fig. 15 shows the insertion loss estimated from the surface density value of the sheet-like soundproof structure 1C of Example 2, assuming that the soundproofing performance is exhibited in accordance with only the mass law.

[0038] 15, it was observed that in Example 2 as well, frequency bands exhibiting insertion losses higher than the mass law exist in frequency bands where sound insulation performance is desired (for example, from about 500 Hz to about 1000 Hz), as in Example 1. From these results, it was confirmed that the sheet-like soundproof structure 1C according to Example 2 has excellent soundproofing performance against sounds in frequency bands where sound insulation performance is desired.

[0039] (3) Example 3 Fig. 11 is a cross-sectional view showing an example of the configuration of a sheet-like soundproof structure 1D according to Example 3 of the present invention. The sheet-like soundproof structure 1D according to Example 3 shown in Fig. 11 is structurally different from the sheet-like soundproof structure 1B according to Example 1 in that an adhesive layer 6 is interposed between the first resin film 3 and the support member 2. The adhesive layer 6 is provided on the surface of the first resin film 3 facing the second resin film 4 (the lower surface in Fig. 11). Other configurations of Example 3 are the same as those of Example 1.

[0040] Fig. 16 is a graph showing the results of measuring the insertion loss of the sheet-like soundproof structure 1D according to Example 3. As shown in Fig. 16, in Example 3 as well, as in Example 1, it was observed that a frequency band showing an insertion loss higher than the mass law exists in a frequency band where sound insulation performance is desired (for example, from about 500 Hz to about 1000 Hz). From this result, it was confirmed that the sheet-like soundproof structure 1D according to Example 3 has excellent soundproof performance against sounds in a frequency band where sound insulation performance is desired.

[0041] (4) Example 4 Fig. 12 is a cross-sectional view showing an example of the configuration of a sheet-like soundproof structure 1E according to Example 4 of the present invention. The sheet-like soundproof structure 1E according to Example 4 shown in Fig. 12 is structurally different from the sheet-like soundproof structure 1B according to Example 1 in that an adhesive layer 6 is interposed between the first resin film 3 and the support member 2, and between the second resin film 4 and the support member 2. The adhesive layer 6 is provided on the surface of the first resin film 3 facing the second resin film 4 (the bottom surface in Fig. 12) and on the surface of the second resin film 4 facing the first resin film 3 (the top surface in Fig. 12). Other configurations of Example 4 are the same as those of Example 1.

[0042] Fig. 17 is a graph showing the results of measuring the insertion loss of the sheet-like soundproof structure 1E according to Example 4. As shown in Fig. 17, in Example 4 as well, as in Example 1, it was observed that a frequency band showing an insertion loss higher than the mass law exists in a frequency band where sound insulation performance is desired (for example, from about 500 Hz to about 1000 Hz). From this result, it was confirmed that the sheet-like soundproof structure 1E according to Example 4 has excellent sound insulation performance against sounds in a frequency band where sound insulation performance is desired.

[0043] (5) Example 5 Fig. 13 is a cross-sectional view showing an example of the configuration of a sheet-like soundproof structure 1F according to Example 5 of the present invention. The sheet-like soundproof structure 1F according to Example 5 shown in Fig. 13 is structurally different from the sheet-like soundproof structure 1B according to Example 1 in that an adhesive that becomes an adhesive layer 6 is applied to the front and back surfaces and side surfaces of the crosspiece 21 of the support member 2. Other configurations of Example 5 are the same as those of Example 1.

[0044] Fig. 18 is a graph showing the results of measuring the insertion loss of the sheet-like soundproof structure 1F according to Example 5. As shown in Fig. 18, in Example 5 as well, as in Example 1, it was observed that a frequency band showing an insertion loss higher than the mass law exists in a frequency band where sound insulation performance is desired (for example, from about 500 Hz to about 1000 Hz). From this result, it was confirmed that the sheet-like soundproof structure 1F according to Example 5 has excellent soundproof performance against sounds in a frequency band where sound insulation performance is desired.

[0045] (Effects of the embodiment) As explained above, the sheet-like soundproof structures 1 and 1A according to the embodiments of the present invention (or the sheet-like soundproof structures 1B to 1F according to the examples) comprise a support member 2 having a plurality of openings 22 partitioned by crosspieces 21, a first resin film 3 covering one side of the support member 2, and a second resin film 4 covering the other side of the support member 2 opposite to the one side. The first resin film 3 and the second resin film 4 are in close contact with the crosspieces 21. Furthermore, in each of the plurality of openings 22, the first resin film 3 and the second resin film 4 are in close contact with each other.

[0046] This makes it possible to prevent gaps from being generated at and around the steps G1, G2 even when steps G1, G2 exist on the front surface 2a and back surface 2b of the support member 2. The first resin film 3 and the second resin film 4 sandwich the support member 2 and behave as if they were a single film (sheet). This allows the sheet-like soundproof structures 1, 1A to 1F to exhibit sound insulation performance and have frequency bands in which the insertion loss exceeds the mass law (see, for example, Figures 14 to 18), thereby achieving excellent soundproofing effects.

[0047] Furthermore, the support member 2 is covered and sealed from the front surface 2a and the back surface 2b (i.e., both surfaces) by the first resin film 3 and the second resin film 4. This prevents the support member 2 from coming into contact with the outside air and rusting, even if it is made of metal. An excellent rust prevention effect can be expected.

[0048] It is preferable to use, for example, expanded metal or an expanded metal-like mesh member (or a wire mesh or a wire mesh-like mesh member) as the support member 2. Expanded metal (or wire mesh) is made of easily available metal materials such as stainless steel, iron, or aluminum, and is relatively inexpensive because it is easy to process and can be mass-produced. By using relatively inexpensive expanded metal (or wire mesh) as the support member 2, it is possible to reduce the manufacturing costs of the sheet-like soundproof structures 1, 1A to 1F.

[0049] In a method for manufacturing a sheet-like soundproof structure according to an embodiment of the present invention, a first resin film 3 is placed on the front surface 2a of a support member 2 having a plurality of openings 22 defined by crosspieces 21, and a second resin film 4 is placed on the back surface 2b of the support member 2. By reducing the pressure between the first resin film 3 and the second resin film 4, the first resin film 3 and the crosspieces 21 are brought into close contact with each other, and the second resin film 4 and the crosspieces 21 are brought into close contact with each other, and the first resin film 3 and the second resin film 4 are brought into close contact with each other at each of the plurality of openings 22. In this way, the above-described sheet-like soundproof structures 1, 1A to 1F can be manufactured.

[0050] (Application example) The above-described sheet-like soundproof structures 1, 1A to 1F may be arranged in the floor of an automobile as soundproofing members for the automobile, and are extremely effective in blocking driving noise in the passenger compartment.

[0051] FIG. 19 is a diagram schematically illustrating an example configuration of a moving body 100 according to an application example of the present invention. As shown in FIG. 19, the moving body 100 is, for example, an automobile, and includes a vehicle 101 and a sheet-like soundproofing structure 1 attached to the floor of the vehicle 101. As described above, the sheet-like soundproofing structure 1 has excellent soundproofing performance against sounds in the frequency band of approximately 500 Hz to approximately 1000 Hz, which is the road noise range, and is extremely effective in blocking running noise. Note that the moving body 100 may include one or more of the sheet-like soundproofing structures 1A to 1F instead of the sheet-like soundproofing structure 1.

[0052] (Other embodiments) As described above, the present invention has been described using embodiments, examples, and application examples. However, the descriptions and drawings that form part of this disclosure should not be understood to limit the present invention. Various alternative embodiments and modifications will become apparent to those skilled in the art from this disclosure. It goes without saying that the present technology includes various embodiments not described herein. Various omissions, substitutions, and / or modifications of components may be made without departing from the spirit of the above-described embodiments and examples. Furthermore, the effects described in this specification are merely illustrative and not limiting, and other effects may also be present. [Explanation of symbols]

[0053] 1, 1A, 1B, 1C, 1D, 1E, 1F Sheet-type soundproof structure 2 Support member 2a surface 2b Back side 3. First resin film 4 Second resin film 5 seats 6 Adhesive layer 7. Bag-shaped member 21 Cross section 22 Opening 23 Convex part 51 Partition 71 Opening section 100 Mobile 101 vehicles G1, G2 steps

Claims

1. a support member having a plurality of openings partitioned by crosspieces; a first film covering one surface of the support member; a second film covering the support member from the other surface side opposite to the one surface, the first film and the second film are in close contact with the crosspiece, A soundproof structure, wherein the first film and the second film are in close contact with each other in each of the plurality of openings.

2. The soundproof structure according to claim 1 , wherein the first film and the second film each have elasticity.

3. the support member has a first step on the one surface side of the crosspiece and a second step on the other surface side of the crosspiece, the first film is provided along the first step in close contact with the crosspiece, The soundproof structure according to claim 1 or 2, wherein the second film is provided along the second step in close contact with the crosspiece.

4. The soundproof structure according to claim 1 or 2, wherein the space between the first film and the second film is in an environment with a lower pressure than the outside space between the first film and the second film.

5. 3. The soundproof structure according to claim 1, wherein the first film and the second film have different thicknesses.

6. The soundproof structure according to claim 1 or 2, further comprising an adhesive layer provided between the first film and the second film.

7. The soundproof structure according to claim 6 , wherein the adhesive layer is provided on a surface of the first film facing the second film.

8. The soundproof structure according to claim 6 , wherein the adhesive layer is provided on a surface of the second film facing the first film.

9. The soundproof structure according to claim 6 , wherein the adhesive layer is provided on the crosspiece.

10. When viewed from a thickness direction of the support member, 3. The soundproof structure according to claim 1, wherein the plurality of openings have the same shape and size and are arranged at equal intervals in a first direction and a second direction intersecting the first direction.

11. 3. The soundproof structure according to claim 1, wherein the support member is an expanded metal or an expanded metal-like mesh member, or a wire mesh or a wire mesh-like mesh member.

12. 3. The soundproof structure according to claim 1, wherein the material constituting the support member is stainless steel, iron, or aluminum.

13. The first film and the second film form a bag-shaped member, 3. The soundproof structure according to claim 1, wherein the bag-shaped member is sealed with the support member disposed inside the bag-shaped member.

14. a first membrane is disposed on one surface of a support member having a plurality of openings partitioned by crosspieces; a second film is disposed on the other surface of the support member, the other surface being opposite to the one surface; A method for manufacturing a soundproof structure, comprising: reducing the pressure between the first membrane and the second membrane to bring the first membrane and the crosspiece into tight contact with each other, and also bringing the second membrane and the crosspiece into tight contact with each other at each of the plurality of openings.

15. Vehicles and a soundproof structure attached to the vehicle, The soundproof structure comprises: a support member having a plurality of openings partitioned by crosspieces; a first film covering one surface of the support member; a second film covering the support member from the other surface side opposite to the one surface, the first film and the second film are in close contact with the crosspiece, In each of the plurality of openings, the first film and the second film are in close contact with each other.

Images