Soundproof structure

Abstract

To provide a thin and light-weight soundproof structure that has sufficient sound insulation performance and easy installability onto a curved installation surface, and is reliably attachable onto another member by an opposite side of a film part.SOLUTION: A soundproof structure 10 includes a sound insulation structure part 1 and a sound insulation structure outside area 11. The sound insulation structure part 1 has a film part 2 having elasticity, support wall parts 3 vertically installed on the film part 2 and having elasticity, and weight parts 4 vertically installed on the film part 2. The film part 2 is divided into plural sections 5 by the support wall parts 3, and the weight part 4 is positioned in each of the plural sections 5. A height H1 of the support wall part 3 is higher than a height H2 of the weight part 4. Each of the weight parts 4 configures a spring mass resonator having a spring part 4a having elasticity and a mass part 4b having larger mass. The sound insulation structure outside area 11 is provided with fitting parts 12, and the fitting part 12 is vertically installed on the film part 2 in the sound insulation structure outside area 11 and is a projection having a mounting hole 12c.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a soundproof structure. [Background technology]

[0002] In recent years, in the rooms of buildings such as apartment buildings, office buildings, and hotels, outdoor noise from automobiles, trains, aircraft, ships, etc. outside the building, and equipment noise and human voices generated outside the room inside the building are required to be blocked, and quietness suitable for the use of the room is required. In addition, in the interior of vehicles such as automobiles, trains, aircraft, and ships, it is desired to reduce noise in order to block wind noise and engine noise and provide a quiet and comfortable space for the occupants. Therefore, there is a demand for means for blocking the propagation of noise and vibration from the outside to the inside of a building or vehicle, and also for the propagation of noise and vibration from the outside to the inside of a building or vehicle, that is, a member with high sound insulation. In recent years, there is a demand for lightweight soundproof structures in buildings due to the increase in height, and there is also a demand for lightweight soundproof members in vehicles to improve energy efficiency. Examples of soundproof structures forming soundproof walls in vehicles and buildings are disclosed in Patent Documents 1 to 5.

[0003] The invention described in Patent Document 1 comprises an acoustic damping panel comprising a rigid frame divided into a number of individual cells, a sheet of flexible material, and a number of weights, each weight being fixed to the sheet of flexible material such that each cell is provided with its own weight, and the attenuated sound is controlled by appropriate selection of the mass of the weights.

[0004] In the invention described in Patent Document 2, in a soundproofing material having an elastic sheet and a support part that holds the sheet and divides the sheet into partitions, the relationship between the rigidity of the sheet in the partitions and the areal density of the sheet is specified.

[0005] The soundproofing material of the invention described in Patent Document 3 is a structure comprising a flat substrate portion and a plurality of resonating portions connected to the substrate portion and having a predetermined resonant frequency, each of the plurality of resonating portions having a weight portion and a connecting portion connecting the weight portion to the substrate portion, and configured such that in a projection view viewed from a direction perpendicular to the substrate portion, the center of gravity of the resonating portion is located outside the joint area between the substrate portion and the connecting portion.

[0006] The vibration reduction device of the invention described in Patent Document 4 has an acoustic meta-structure that is attached to the vehicle body and blocks vibrations transmitted through the vehicle body, and includes a cross-shaped frame that is attached to the vehicle body and divides a certain space into certain areas, and vibrators that are configured at the corners of each area divided by the frame and have their own natural frequencies, blocking vibrations transmitted from the vehicle body through the frame.

[0007] The sound insulation structure described in Patent Document 5 has a resonating portion having multiple convex rubber elasticity and a sheet-like support body that supports the resonating portion, the resonating portion having a storage modulus G' of 100 MPa or less at 25°C and 10 kHz, and the support body having an areal density of 1.0 kg / m 2 The following is the result. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] JP 2005-250474 A [Patent Document 2] International Publication No. 2019 / 022245 [Patent Document 3] JP 2021-152584 A [Patent Document 4] JP 2020-91481 A [Patent Document 5] International Publication No. 2019 / 208727 Summary of the Invention [Problem to be solved by the invention]

[0009] The sound-damping panel described in Patent Document 1 has a rigid frame that is not flexible, and vibrations are transmitted to the seat via this rigid frame, so there is a risk that sufficient sound insulation cannot be obtained. In addition, if the surface on which the rigid frame is placed is curved or uneven, the sound-damping panel may not be stably held. In particular, since the panels of general vehicles (e.g., automobiles) have many curved or uneven parts, it is difficult to simply use the sound-damping panel of Patent Document 1 as a sound-insulating material for vehicles. In addition, the rigid frame has a large mass, and the increase in mass due to the sound-insulating material in the vehicle may be a problem.

[0010] The soundproofing material described in Patent Document 2 has a high support part, i.e., a high height extending from the seat in a direction perpendicular to the seat, and is preferably 25 mm or more. In order to stably support the seat with such a high support part, it is preferable that the support part has rigidity. As a result, there is a risk that sufficient sound insulation cannot be obtained because vibrations are transmitted through the support part, and it is difficult to place the soundproofing material on a curved or uneven placement surface such as a panel of a vehicle (e.g., an automobile). In addition, such a high support part leads to an increase in size and weight of the entire soundproofing material, and when placed on a panel of a vehicle, the soundproofing material occupies a large space inside the vehicle, reducing space efficiency, and there is a concern that it will hinder the installation of other components and get in the way of occupants.

[0011] In the sound insulation material described in Patent Document 3, the resonating part, which is the functional part that exerts the sound insulation effect, is exposed and not covered by a supporting wall, etc., and there is a risk that the sound insulation performance will decrease or change if this resonating part comes into contact with other members or the human body. Therefore, it is necessary to provide a large space around the resonating part, which reduces the space efficiency.

[0012] The vibration reduction device described in Patent Document 4 does not have a membrane part, but is composed of a plurality of vibrators and a frame connecting them. Therefore, like the sound insulation material of Patent Document 3, the vibrator, which is a functional part that exerts a sound insulation effect, is exposed, and if this vibrator comes into contact with other members or the human body, the sound insulation may be reduced or changed. In addition, in order to ensure the minimum structural strength of the vibration reduction device, the frame is required to have rigidity. As a result, since vibration is transmitted through the frame, there is a risk that sufficient sound insulation cannot be obtained, and it is difficult to place the vibration reduction device of Patent Document 4 on a curved or uneven mounting surface such as a panel of a vehicle (e.g., an automobile).

[0013] In the sound insulation structure described in Patent Document 5, a rib-shaped protrusion higher than the resonating parts is provided near the outer periphery of a sheet-like support, outside the area where many resonating parts are formed. However, no rib-shaped protrusion is provided within the large-area resonating part formation area. The support of this sound insulation structure is attached to another member by an adhesive layer or the like, but it is not assumed that the end face of the rib-shaped protrusion opposite the support will be fixed to another member (e.g., a vehicle panel). In addition, since the resonating part formation area between the rib-shaped protrusion and the opposing rib-shaped protrusion is wide, the installation stability is not good when the end face of the rib-shaped protrusion opposite the support is placed on and held on another member.

[0014] Therefore, the object of the present invention is to provide a thin and lightweight soundproofing structure that has sufficient soundproofing properties, can be easily and stably placed on a curved or uneven support surface such as the panel of a building, mechanical device, or vehicle (e.g., an automobile), and can be reliably attached to another component on the opposite side of the membrane portion, and has good soundproofing properties, particularly in the low frequency range of 1000 Hz or less. [Means for solving the problem]

[0015] The soundproof structure of the present invention includes a sound insulation structure part and a sound insulation structure outside area located outside the sound insulation structure part in a planar view, the sound insulation structure part has an elastic membrane part, an elastic support wall part standing on the membrane part, and a weight part standing on the membrane part, the membrane part is divided into a plurality of compartments by the support wall part, the weight part is located inside all of the plurality of compartments or inside some of the plurality of compartments, and in the compartment in which the weight part is located, one weight part is arranged in one of the compartments, a height of the support wall part extending in a direction perpendicular to the membrane part is greater than a height of the weight part extending in a direction perpendicular to the membrane part, each of the weight parts constitutes a spring mass resonator having an elastic spring part and a mass part having a mass greater than that of the spring part, the sound insulation structure outside area is provided with an attachment part to be attached to another member, the attachment part is a protrusion standing on the membrane part in the sound insulation structure outside area and having an attachment hole. The term "elasticity" used here refers to the property of a solid substance that has been deformed by an external force returning to its original shape when the external force is removed, and includes energy elasticity and rubber elasticity (entropy elasticity). Here, a substance is said to have "elasticity" when it has at least one of energy elasticity and rubber elasticity (entropy elasticity). The membrane portion, the support wall portion and the spring portion may all be made of a material that has no energy elasticity but has rubber elasticity, a material that has no rubber elasticity but has energy elasticity, or a material that has both rubber elasticity and energy elasticity. The film portion, the supporting wall portion, and the spring portion may all have a dynamic storage modulus of 0.01 MPa or more and 100 MPa or less at 23° C. and at a frequency of 1 Hz to 1000 Hz. The film portion, the supporting wall portion, and the spring portion may all be made of an elastic body having a loss tangent of 0.01 or more and 0.50 or less at 23° C. and at a frequency of 1 Hz to 1000 Hz. Specifically, the elasticity of the film part, the supporting wall part, and the spring part is evaluated by a dynamic storage modulus (E') obtained by measuring frequency dependency in tension or compression mode with a dynamic viscoelasticity measuring device in accordance with JIS K7244 and obtaining a master curve based on 23° C., and the dynamic storage modulus (E') at 23° C. and at a frequency of 1 Hz to 1000 Hz is 0.01 MPa or more and 100 MPa or less. More preferably, both the film part and the supporting wall part may be made of an elastic body having a dynamic storage modulus (E') at 23° C. and at a frequency of 1 Hz to 1000 Hz of 0.05 MPa or more and 50 MPa or less, and a loss tangent at 23° C. and at a frequency of 1 Hz to 1000 Hz of 0.05 or more and 0.45 or less. The spring portion of the weight may be located on a side of the weight that is attached to the membrane portion, and the mass portion may be located on a side of the weight that is opposite to the side that is attached to the membrane portion. The mass portion of the weight portion may have a larger volume than the spring portion. The mass portion of the weight portion may be made of a material having a higher density than the spring portion.

[0016] Another soundproof structure of the present invention includes a sound insulation structure part and a sound insulation structure outside area located outside the sound insulation structure part in a planar view, the sound insulation structure part having an elastic membrane part, an elastic supporting wall part standing on the membrane part, and a weight part standing on the membrane part, the membrane part is divided into a plurality of compartments by the supporting wall part, the weight part is located inside all of the plurality of compartments or inside some of the plurality of compartments, and in the compartment in which the weight part is located, one weight part is arranged in one of the compartments, the height of the supporting wall part extending in a direction perpendicular to the membrane part is greater than the height of the weight part extending in a direction perpendicular to the membrane part, the membrane part serves as a spring part, and the weight part serves as a mass part to constitute a spring mass resonator, the sound insulation structure outside area is provided with an attachment part to be attached to another member, and the attachment part is a protrusion standing on the membrane part in the sound insulation structure outside area and having an attachment hole. Both the membrane portion and the supporting wall portion may be made of any of a material that has rubber elasticity but not energy elasticity, a material that has energy elasticity but not rubber elasticity, or a material that has both rubber elasticity and energy elasticity. Both the film part and the supporting wall part may have a dynamic storage modulus of 0.01 MPa or more and 100 MPa or less at 23° C. and at a frequency of 1 Hz to 1000 Hz. Also, both the film part and the supporting wall part may be made of an elastic body having a loss tangent of 0.01 or more and 0.50 or less at 23° C. and at a frequency of 1 Hz to 1000 Hz. More preferably, both the film part and the supporting wall part may be made of an elastic body having a dynamic storage modulus (E') of 0.05 MPa or more and 50 MPa or less at 23° C. and at a frequency of 1 Hz to 1000 Hz, and a loss tangent of 0.05 or more and 0.45 or less at 23° C. and at a frequency of 1 Hz to 1000 Hz.

[0017] The soundproof structure and the other soundproof structure of the present invention may have the following configuration. The membrane portion has an opening in an area outside the sound-proofing structure, and the protrusion portion may have a hollow cylindrical or square tube-shaped side wall portion extending perpendicular to the membrane portion from the inner peripheral edge of the opening or from a position inside the inner peripheral edge in a planar view, a plate portion arranged in a position to block the hollow portion of the side wall portion on the opposite side to the membrane portion, and the mounting hole formed in the plate portion. The protrusion and the support wall may be integrally formed. The plate portion may be provided with a protrusion that protrudes toward the membrane portion or toward the opposite side of the membrane portion. The height of the protrusion in a direction perpendicular to the membrane may be greater than the height of the support wall in a direction perpendicular to the membrane. The support wall portion may include a plurality of first wall portions extending in a direction perpendicular to the membrane portion and extending in a first direction parallel to the membrane portion, and a plurality of second wall portions extending in a direction perpendicular to the membrane portion and extending in a second direction perpendicular to the first direction. The support wall portion may be cylindrical having a circular, elliptical or oval cross-sectional shape that defines each of the compartments, or may be rectangular tubular having a polygonal cross-sectional shape that defines each of the compartments, specifically a square, regular pentagon or regular hexagon. The area of ​​each of the compartments is 100 mm 2 More than 1000mm 2 It may be the following: The area of ​​the membrane is 1000 cm 2 There may be from 10 to 1000 such compartments per unit area, and more preferably from 50 to 500 such compartments per unit area. The plate thickness of the support wall portion may be 0.5 mm or more and 5.0 mm or less, and is more preferably 1.0 mm or more and 3.0 mm or less. The film thickness of the film portion may be 0.1 mm or more and 3.0 mm or less. The height in a direction perpendicular to the film portion may be 5 mm or more and 20 mm or less. The height of the support wall in the direction perpendicular to the membrane may be 5 mm to 20 mm, and more preferably 10 mm to 20 mm. The support wall may have different heights in parts. The support wall may have a plurality of support walls, and some of the support walls may have a height extending in a direction perpendicular to the membrane portion greater than the other support walls. The height of the support wall that is taller extending in a direction perpendicular to the membrane portion may be greater than 10 mm and not greater than 20 mm, and the height of the other support walls (the support wall that is shorter) may be not greater than 10 mm. The support wall that is taller here refers to a support wall that is taller (for example, 1 mm or more) than the other support walls (the support wall that is shorter). The weight portion may have a height of 1 mm or more extending in a direction perpendicular to the film portion. The film portion may have a durometer A hardness of 30 or more, and the support wall portion may have a durometer A hardness of 1 or more and 90 or less. The durometer A hardness can be obtained by measurement in accordance with JIS K 6253-3. Effect of the Invention

[0018] According to the present invention, it is possible to provide a thin and lightweight soundproofing structure which has sufficient soundproofing properties, can be easily and stably placed on curved or uneven surfaces such as the panels of buildings, machinery, or vehicles (e.g., automobiles), and can be reliably attached to other components on the opposite side of the membrane portion, and which has particularly good soundproofing properties in the low frequency range of 1000 Hz or less. [Brief description of the drawings]

[0019] [Figure 1] FIG. 1A is a perspective view of a soundproof structure according to a first embodiment of the present invention, and FIG. 1B is a cross-sectional view taken along line AA thereof. [Diagram 2] 2A is an exploded perspective view of one section of the sound-insulating structure of the soundproof structure shown in FIG. 1, and FIG. 2B is an exploded front view of the sound-insulating structure. [Diagram 3] 2 is an exploded perspective view of a mounting portion in an outer region of the soundproof structure of the soundproof structure shown in FIG. 1, as viewed from above. FIG. [Figure 4] 2 is an exploded perspective view of a mounting portion in an area outside the soundproof structure of the soundproof structure shown in FIG. 1, as viewed from the bottom side. FIG. [Diagram 5] 5 is a front view showing the mounting state of the mounting portion shown in FIGS. 3 and 4. FIG. [Figure 6] 1. (A) to (C) are cross-sectional views of modified examples of the mounting portion of the soundproof structure shown in FIG. [Figure 7] FIG. 2 is a cross-sectional view showing a soundproof structure according to a modified example of the first embodiment of the present invention. [Figure 8] FIG. 1A is a perspective view of a soundproof structure according to another modified example of the first embodiment of the present invention, and FIG. 1B is a cross-sectional view taken along line AA thereof. [Figure 9] FIG. 1A is a cross-sectional view of a soundproof structure according to still another modified example of the first embodiment of the present invention, and FIG. 1B is a perspective view of a weight part of a sound insulating structure of the soundproof structure. [Figure 10] FIG. 1A is a cross-sectional view of a soundproof structure according to still another modified example of the first embodiment of the present invention, and FIG. 1B is a perspective view of a weight part of a sound insulating structure of the soundproof structure. [Figure 11]2A is a perspective view of a soundproof structure according to a second embodiment of the present invention, and FIG. 2B is a cross-sectional view taken along line AA thereof. [Figure 12] FIG. 13(A) is a cross-sectional view of a soundproof structure according to a modified example of the second embodiment of the present invention, and FIG. 13(B) is a perspective view of a weight part of a sound insulating structure part of the soundproof structure. [Figure 13] FIG. 1A is a plan view showing a schematic diagram of one section of a soundproof structure of a soundproof structure of the present invention, and FIG. 1B is a plan view showing a schematic diagram of a plurality of sections. [Figure 14] FIG. 2(A) is a plan view showing a schematic diagram of one section of another example of a sound-insulating structure part of a soundproof structure of the present invention, and FIG. 2(B) is a plan view showing a schematic diagram of a plurality of sections. [Figure 15] FIG. 1(A) is a plan view showing a schematic diagram of one section of still another example of a sound-insulating structure part of a soundproof structure of the present invention, and FIG. 1(B) is a plan view showing a schematic diagram of a plurality of sections. [Figure 16] FIG. 1(A) is a plan view showing a schematic diagram of one section of still another example of a sound-insulating structure part of a soundproof structure of the present invention, and FIG. 1(B) is a plan view showing a schematic diagram of a plurality of sections. [Figure 17] FIG. 1(A) is a plan view showing a schematic diagram of one section of still another example of a sound-insulating structure part of a soundproof structure of the present invention, and FIG. 1(B) is a plan view showing a schematic diagram of a plurality of sections. [Figure 18] FIG. 1 is a front view showing an example of a state in which the soundproof structure of the present invention is used. [Figure 19] FIG. 1 is a cross-sectional view showing a soundproof structure according to a first embodiment of the present invention. [Figure 20] 1 is a graph showing sound insulation properties of Examples 1 and 2 of the present invention and Comparative Example 3. [Figure 21] 1 is a graph showing sound insulation properties of Example 1 of the present invention and Comparative Example 1. [Figure 22] 1 is a graph showing sound insulation properties of Example 2 of the present invention and Comparative Example 2. [Figure 23] FIG. 1 is a cross-sectional view showing a structure of Comparative Example 1. [Figure 24] FIG. 11 is a cross-sectional view showing the structure of Comparative Example 2. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. [First embodiment] FIG. 1(A) is a perspective view of a soundproof structure 10 according to a first embodiment of the present invention, and FIG. 1(B) is a cross-sectional view taken along line AA in FIG. 1(A). The soundproof structure 10 includes a soundproof structure 1 and an outside soundproof structure area 11 located outside the soundproof structure 1 in a plan view. The soundproof structure 1 includes an elastic sheet-like film 2, an elastic support wall 3 standing substantially vertically from the film 2, and a weight 4 standing substantially vertically from the film 2. The film 2 is divided into a plurality of sections (unit structures) 5 by the support wall 3. The weight 4 is located in each of the plurality of sections 5, or in some of the plurality of sections 5. In the section 5 in which the weight 4 is located, one weight 4 is located in one section 5. FIG. 2(A) is an exploded perspective view of one section 5 of the soundproof structure 1, and FIG. 2(B) is an exploded front view thereof. The height H1 of the support wall 3 extending from the membrane 2 in a direction perpendicular to the membrane 2 is greater than the height H2 of the weight 4 extending from the membrane 2 in a direction perpendicular to the membrane 2. Each weight 4 constitutes a spring mass resonator having an elastic spring 4a and a mass 4b having a larger mass than the spring 4a. The term "elasticity" as used here refers to the property of a solid material that has been deformed by an external force and returns to its original shape when the external force is removed, and includes energy elasticity and rubber elasticity (entropy elasticity). Here, the term "having elasticity" refers to the case where at least one of energy elasticity and rubber elasticity (entropy elasticity) is present.

[0021] The support wall 3 of this embodiment includes a plurality of first walls 3a extending in a first direction D1 parallel to the membrane 2, and a plurality of second walls 3b extending in a second direction D2 perpendicular to the first direction D1. Specifically, the plurality of first walls 3a are arranged in parallel, and the plurality of second walls 3b are arranged in parallel, and the first walls 3a and the second walls 3b are integrated at the intersections. In this way, the plurality of first walls 3a and the plurality of second walls 3b form a lattice structure, and a plurality of compartments 5 having a square planar shape partitioned by the first walls 3a and the second walls 3b are arranged in a matrix shape. In other words, the support wall 3 has a structure in which a plurality of square tubes having a square cross-sectional shape that defines each compartment 5 are arranged. The support wall 3 is preferably made of a flexible material such as rubber, elastomer, or resin foam. The flexible material referred to here is any one of a material that has rubber elasticity but not energy elasticity, a material that has energy elasticity but not rubber elasticity, and a material that has both rubber elasticity and energy elasticity.

[0022] In the present embodiment, the part of the weight part 4 attached to the membrane part 2 is the spring part 4a, and the part opposite to the side attached to the membrane part 2 is the mass part 4b, which has a larger mass than the spring part 4a. In the example shown in Figs. 1(A) to 2(B), the spring part 4a and the mass part 4b have the same shape and the same dimensions, but are made of different materials. The spring part 4a is made of a flexible material, and the mass part 4b is made of a material with a higher density than the material constituting the spring part 4a. A spring mass resonator is configured in which the spring part 4a functions as a spring and the mass part 4b functions as a mass. In addition to the spring part 4a of the weight part 4, the membrane part 2 may also function as a part of the spring of the spring mass resonator. Furthermore, the air in the space surrounded by the membrane part 2 and the support wall part 3 may also function as a part of the spring of the spring mass resonator (air spring). It is preferable that the spring portion 4a is also made of a flexible material, i.e., a material that has rubber elasticity but not energy elasticity, a material that has energy elasticity but not rubber elasticity, or a material that has both rubber elasticity and energy elasticity.

[0023] According to the sound insulation structure 1 of this embodiment, the vibration of the membrane 2 is controlled by the action of a spring mass resonator constituted by the spring portion 4a and the mass portion 4b of the weight portion 4. In particular, in a specific frequency range (for example, frequencies below 1000 Hz, which is the main frequency band of road noise in automobiles), the membrane vibration is significantly reduced, and as a result, the radiation sound from the membrane 2 is reduced, and high sound insulation is achieved.

[0024] The sound insulation structure 1 of this embodiment has a section 5 with a membrane 2 of 1000 cm 2 It is preferable to provide 10 to 1000 sections per unit area, and more preferable to provide 50 to 500 sections per unit area. This prevents the number of sections 5 from being too small, and provides the effect of dividing the entire sound insulation structure 1 into a plurality of sections 5 and allowing each section to exhibit its own sound insulation effect, thereby preventing a decrease in the sound insulation properties of the entire sound insulation structure 1. In addition, the number of sections 5 is not too large, and the weight of the entire sound insulation structure 1 can be reduced. The planar area of ​​each section 5 is 100 mm 2 More than 1000mm 2 It is preferable that the length is less than 200 mm. 2 More than 800mm 2 It is more preferable that the height of the entire sound insulation structure 1 in the direction perpendicular to the film portion 2 is 5 mm or more and 20 mm or less. As a result, the area of ​​the planar shape of each of the sections 5 is not too small, making it easy to arrange the weight portion 4 inside, and the area is not too large, so that sufficient sound insulation can be maintained by the effect of the weight portion 4 on the film portion 2. It is preferable that the height of the entire sound insulation structure 1 is not too low, so that the weight portion 4 has a sufficient height as a spring mass resonator, and is not too high, so that the entire sound insulation structure 1 can be made lighter. Note that each drawing shows each section 5 and the supporting wall portion 3, etc., in a schematic manner, and the number and area of ​​the sections 5 and the height of the sound insulation structure 1 may not be shown strictly and accurately, or may not be unified in each drawing, but it is preferable that the number and area of ​​the sections 5 and the height of the sound insulation structure 1 are appropriately designed to be within the above-mentioned numerical ranges.

[0025] The film part 2, the supporting wall part 3 and the spring part 4a of the sound insulation structure part 1 of this embodiment are all made of an elastic body having a dynamic storage modulus (E') of 0.01 MPa to 100 MPa at 23° C. and a loss tangent (tan δ) of 0.01 to 0.50 at 23° C. and a frequency of 1 Hz to 1000 Hz, preferably a dynamic storage modulus (E') of 0.05 MPa to 50 MPa at 23° C. and a loss tangent (tan δ) of 0.05 to 0.50 at 23° C. and a frequency of 1 Hz to 1000 Hz, respectively. The dynamic storage modulus (E') and the loss tangent (tan δ) are determined by creating a master curve based on 23° C. using a dynamic viscoelasticity tester. When the dynamic storage modulus (E') is 0.01 MPa or more at 23°C and frequencies of 1 Hz to 1000 Hz, the sound insulation performance in the target frequency band is good, and the shape retention of the film 2 and the supporting wall 3 is also good. When the dynamic storage modulus (E') is less than 100 MPa at 23°C and frequencies of 1 Hz to 1000 Hz, the vibration in the target frequency band is good, and the sound insulation structure 1 becomes rigid and easy to install. The film 2 and the supporting wall 3 may be made of the same material or different materials. It is preferable that the film 2 is also made of a flexible material, that is, a material that does not have energy elasticity but has rubber elasticity, a material that does not have rubber elasticity but has energy elasticity, or a material that has both rubber elasticity and energy elasticity.

[0026] The film portion 2 is preferably a hard elastic film since the weight portion 4 is attached to it. The dynamic storage elastic modulus (E') of the film portion 2 is preferably 15 MPa or more, and the thickness (film thickness) is preferably 1 μm or more and 3000 μm or less, and more preferably 10 μm or more and 1000 μm or less. When the film portion 2 has a certain thickness or more, sufficient thickness can be secured, making it easy to handle. On the other hand, when the thickness of the film portion 2 is not too thick, an increase in the thickness and weight of the entire sound insulation structure portion 1 is prevented, and the entire sound insulation structure portion 1 does not become too hard, so that the installation is good. The material of the film portion 2 preferably has a durometer A hardness of 30 or more according to JIS K6253, and more preferably 70 or more. When the durometer A hardness of the film portion 2 is within the above range, deterioration of the vibration of the film portion 2 is prevented, and sound insulation of the frequency band to be sound-insulated is good. The stiffness (axial stiffness) k of the membrane 2 is expressed as k = E' × A / L from the dynamic storage modulus E', the cross-sectional area A of the membrane 2, and the thickness L of the membrane 2. When the area of ​​the membrane 2 to be evaluated for stiffness is 1000 cm 2 When the stiffness k is 10 4 N / mm or more 10 9 It is preferable that the resistance is less than 10 N / mm. 5 N / mm or more 10 8 It is more preferable that the surface area of ​​the membrane portion 2 is 1000 cm 2 When the stiffness is 10 4 When the surface area of ​​the film 2 is 1000 cm or more, the deterioration of the vibration of the film 2 can be suppressed, and the sound insulation performance in the frequency band to be insulated can be improved. 2 When the stiffness is 10 9 Since the sound insulation structure 1 has a stiffness smaller than N / mm, the sound insulation structure 1 is flexible and easy to install. The bending stiffness K of the film 2 is expressed as K=E'×I from the dynamic storage modulus E' and the second moment of area I, and the second moment of area I is expressed as I=b×h from the thickness h of the film 2 and the width b of the film 2. 3 / 12. When the area of ​​the membrane part 2 to be evaluated is 1000 cm 2 When the bending stiffness K is 1N / mm 2 Over 10 5 N / mm 2It is preferable that the resistance is less than 10 N / mm 2 5×10 or more 4 N / mm 2 It is more preferable that the area of ​​the membrane portion 2 is 1000 cm or less. 2 The bending stiffness K when 2 By satisfying the above, the film portion 2 has a good vibration and can suppress deterioration of the sound insulation performance in the frequency band to be sound-insulated. 2 When the bending stiffness K is 10 5 N / mm 2 When the thickness is as follows, the sound insulation structure 1 becomes flexible and the installation becomes easy. The cross-sectional shape of the film portion 2 is not particularly limited, and may be flat or may have irregularities.

[0027] Examples of materials for the membrane portion 2 include crosslinked (vulcanized) rubber, thermoplastic elastomer, and plastic. Examples of crosslinked (vulcanized) rubber include natural rubber (NR), isoprene rubber (IR), butadiene rubber (BR), styrene-butadiene rubber (SBR), chloroprene rubber (CR), butyl rubber (IIR), nitrile rubber (NBR), hydrogenated nitrile rubber (HNBR), ethylene-α-olefin-non-conjugated polyene copolymers such as ethylene-propylene rubber (EPM), ethylene-propylene-diene rubber (EPDM) and ethylene-butene-diene rubber (EBDM), chlorosulfonated polyethylene (CSM), chlorinated polyethylene (CM), acrylic rubber (ACM), ethylene-acrylic rubber (AEM), ethylene-vinyl acetate rubber (EVA), epichlorohydrin rubber (CO, ECO), polysulfide rubber (T), silicone rubber (Q) such as methylvinylsilicone rubber (VMQ) and fluorinated silicone rubber (FVMQ), urethane rubber (U), and fluororubber (FKM). These crosslinked (vulcanized) rubbers can be used alone or in combination of two or more kinds. Examples of the crosslinking (vulcanization) method include a method of crosslinking (vulcanization) by heating using an organic peroxide, a phenolic resin, an oxime compound, sulfur, a sulfur-based compound, or a polyamine compound as a crosslinking agent (vulcanizing agent), or a method of crosslinking by irradiating with an electron beam. The crosslinked (vulcanized) rubber may contain various known compounding agents (reinforcing agents such as carbon black and silica, fillers such as calcium carbonate, softeners such as paraffin oil and plasticizers, processing aids, antioxidants, light stabilizers, flame retardants, antifungal agents, acid acceptors, silane coupling agents, antistatic agents, ultraviolet absorbing agents, etc.) that are generally used as rubber compounding agents. These crosslinked (vulcanized) rubbers, crosslinking agents (vulcanizing agents), and compounding agents may be made from biomass raw materials.

[0028] Examples of the thermoplastic elastomer include olefin-based thermoplastic elastomers, styrene-based thermoplastic elastomers, polyester-based thermoplastic elastomers, polyvinyl chloride-based thermoplastic elastomers, and ethylene-vinyl acetate-based thermoplastic elastomers. Examples of the plastic include polyethylene, polypropylene, polystyrene, polyethylene terephthalate, polyvinyl chloride, and composite resins containing these. These thermoplastic elastomers and plastics may be made from biomass raw materials.

[0029] Specifically, the material of the film portion 2 is preferably ethylene-propylene-diene rubber, a thermoplastic olefin-based elastomer, a thermoplastic styrene-based elastomer, polyethylene, polypropylene, polyethylene terephthalate, thermoplastic polyurethane, or the like.

[0030] The supporting wall 3 is preferably made of a soft, flexible material within a range capable of supporting the film 2. The plate thickness of the supporting wall 3 is preferably 0.5 mm or more and 5.0 mm or less, and more preferably 1.0 mm or more and 3.0 mm or less. When the plate thickness of the supporting wall 3 is 0.5 mm or more, the shape retention of the sound insulation structure 1 is good. When the plate thickness of the supporting wall 3 is 5.0 mm or less, the vibration of the film 2 is good, the sound insulation of the frequency band to be sound-insulated is good, and the increase in the weight of the entire sound insulation structure 1 can be suppressed. The height of the supporting wall 3 extending in a direction perpendicular to the film 2 is preferably 5 mm or more and 20 mm or less, and more preferably 10 mm or more and 20 mm or less. The supporting wall 3 may have a different height in parts. When the height of the supporting wall 3 is different in parts, the higher part may be 10 mm or more and 20 mm or less, more preferably 12 mm or more and 20 mm or less, and even more preferably 14 mm or more and 20 mm or less. The support wall 3 is not too low in height, so that the weight 4 can have a sufficient height as a spring mass resonator. The support wall 3 is not too high in height, so that the overall weight can be reduced. The material of the support wall 3 preferably has a durometer A hardness according to JIS K6253 of 1 or more and 90 or less, more preferably 10 or more and 70 or less. The support wall 3 has a durometer A hardness of 1 or more, so that the shape retention of the sound insulation structure 1 can be maintained. The support wall 3 has a durometer A hardness of 90 or less, so that the vibration from the support wall 3 is prevented from being transmitted to the membrane 2, which would deteriorate the sound insulation performance, and the sound insulation structure 1 becomes flexible and easy to install. The stiffness k of the support wall 3 is expressed as k=E'×A / L, where E' is the dynamic storage elastic modulus, A is the cross-sectional area of ​​the support wall 3, and L is the height of the support wall 3. When the area of ​​the support wall 3 to be evaluated for stiffness is 1000 cm 2 When the stiffness k is 10N / mm or more, 6 It is preferable that the resistance is less than 10 N / mm. 2 N / mm or more 10 5 It is more preferable that the surface area of ​​the support wall 3 is 1000 cm or less. 2When the area of ​​the support wall 3 is 1000 cm, the stiffness k is 10 N / mm or more, so that the shape retention of the sound insulation structure 1 can be maintained. 2 When the stiffness k is 10 6 By setting the resistance to N / mm or less, vibrations from the supporting wall 3 are prevented from being transmitted to the membrane 2, which would deteriorate the sound insulation performance, and the sound insulation structure 1 becomes rigid, making it easier to install.

[0031] Examples of the material of the support wall 3 include crosslinked (vulcanized) rubber, thermoplastic elastomer, and resin foam. The crosslinked (vulcanized) rubber and thermoplastic elastomer may be the same as the materials listed as the materials of the membrane 2. The resin foam may have a closed cell structure or an open cell structure, and examples of the resin foam include polyurethane foam, polystyrene foam, polyethylene foam, and ethylene-vinyl acetate rubber (EVA) foam. Specifically, the material of the support wall 3 is preferably ethylene-propylene-diene rubber, urethane rubber, silicone rubber, thermoplastic olefin-based elastomer, thermoplastic styrene-based elastomer, thermoplastic polyurethane, and polyurethane foam. These resin foams may be made of biomass raw materials.

[0032] The material of the spring portion 4a of the weight portion 4 is a flexible material such as crosslinked (vulcanized) rubber, thermoplastic elastomer, resin foam, etc. The crosslinked (vulcanized) rubber, thermoplastic elastomer, and resin foam may be the same as the materials given as the materials of the support wall portion 3. Specifically, the material of the spring portion 4a of the weight portion 4 is preferably ethylene-propylene-diene rubber, urethane rubber, silicone rubber, thermoplastic olefin-based elastomer, thermoplastic styrene-based elastomer, thermoplastic polyurethane, polyurethane foam, etc.

[0033] The material of the mass portion 4b is not particularly limited, but it is made of resin, metal, or the like, and the mass portion 4b has a larger mass than the spring portion 4a, for example, a mass of 0.1 g or more and 2.0 g or less. The mass portion 4b preferably has a mass at least twice the mass of the spring portion 4a. By making the weight of the mass portion 4b at least twice the mass of the spring portion 4a, the weight portion 4 can be sufficiently resonated in the frequency range to be sound-insulated, and deterioration of sound insulation can be prevented. When the material of the mass portion 4b is resin, the resin may be made of a biomass material.

[0034] The spring constant (rigidity) of the spring portion 4a is determined based on the mass of the mass portion 4b so that the resonant frequency coincides with the frequency to be mainly sound-insulated. As an example, when the mass portion 4b has a mass of 1.0 g and the frequency to be mainly sound-insulated is 1000 Hz or less, the spring constant of the spring portion 4a is 1 N / mm or more and 50 N / mm or less.

[0035] FIG. 3 is an exploded perspective view of the mounting portion 12 of the sound insulation structure outside region 11 of the soundproof structure 10 of this embodiment, seen from the top side, and FIG. 4 is an exploded perspective view of the mounting portion 12 seen from the bottom side by turning FIG. 3 upside down. FIG. 5 is a front view showing the mounting state of the mounting portion 12 shown in FIGS. 3 and 4. In the soundproof structure 10 of this embodiment, the sound insulation structure outside region 11 is provided outside the sound insulation structure part 1 having the above-mentioned configuration, in a plan view. As shown in FIGS. 3 and 4, an opening 2a is provided in the film part 2 in the sound insulation structure outside region 11, and the mounting portion 12 is provided at a position facing the opening 2a. The mounting portion 12 has a protruding portion protruding from the film part 2, and since the mounting portion and the protruding portion of this embodiment are substantially the same member, the mounting portion and the protruding portion may be represented by the same reference numeral 12 in this specification. The mounting portion 12, i.e., the protruding portion, has a hollow cylindrical or square tubular side wall portion 12a extending from the inner peripheral edge of the opening 2a or from a position inside the inner peripheral edge in the same direction as the support wall portion 3, i.e., perpendicular to the film portion 2, a plate portion 12b provided at a position to close the hollow portion of the side wall portion 12a on the opposite side to the film portion 2, and a mounting hole 12c formed in the plate portion 12b. That is, the hollow portion of the side wall portion 12a is closed by the plate portion 12b provided at the end or near the end on the opposite side to the film portion 2, except for the mounting hole 12c. As shown in FIG. 5, a mounting tool 13 such as a screw or a pin that penetrates another member 14 (e.g., a panel of an automobile) is inserted through the mounting hole 12c and fixed, thereby mounting the soundproof structure 10 to the other member 14. That is, the protruding portion having the side wall portion 12a, the plate portion 12b, and the mounting hole 12c of the sound insulation structure outer area 11 constitutes the mounting portion 12 for mounting to another member 14. In the example shown in Fig. 1, the side wall portion 12a and the plate portion 12b of the protruding portion (mounting portion) 12 are integrally formed with the support wall portion 3, and the side wall portion 12a and the support wall portion 3 are partially connected. However, the side wall portion 12a and the plate portion 12b do not have to be integrally formed with the support wall portion 3.

[0036] In this manner, the side wall 12a extending perpendicular to the film 2 is provided in the outside sound insulation structure area 11, and the plate 12b having the mounting hole 12c provided on the side of the side wall 12a opposite to the film 2 is attached to the other member 14. Therefore, the soundproof structure 10 of this embodiment can be easily attached to the other member 14 not only on the film 2 side but also on the opposite side to the film 2. Compared to a configuration in which a mounting hole is simply formed in the film 2, the mounting portion 12 of this embodiment is formed as a protruding portion, so that the strength of the mounting portion 12 is high, and therefore the joining strength of the soundproof structure 10 to the other member is high. Since the mounting portion 12 is provided in the outside sound insulation structure area 11 rather than the soundproof structure 1, the attachment to the other member 14 does not affect the soundproofing effect very much.

[0037] 6(A) to 6(C) show modified examples of the mounting portion 12 of the soundproof structure 10 of this embodiment. In the example shown in FIG. 6(A), the thickness of the side wall portion 12a is thicker than the thickness of the plate portion 12b and is thicker than the thickness of the support wall portion 3. This configuration increases the strength of the mounting portion 12. In the example shown in FIG. 6(B), the plate portion 12b is provided not at the end of the side wall portion 12a opposite to the film portion 2, but at a position slightly closer to the film portion 2 side than the end. In this configuration, the plate portion 12b does not abut against the other member 14, and only the tip portion of the side wall portion 12a abuts against the other member 14. In the example shown in FIG. 6(C), the plate portion 12b provided at the end of the side wall portion 12a opposite to the film portion 2 is provided with a protrusion portion 12d protruding toward the film portion 2 side. Thus, in the example shown in Fig. 6(A), the side wall portion 12a is thicker than the plate portion 12b, in the example shown in Fig. 6(B), the tip of the side wall portion 12a protrudes further than the plate portion 12b, and in the example shown in Fig. 6(C), the plate portion 12b is provided with a protrusion 12d that protrudes toward the membrane portion 2. Either configuration has the advantage that when an external force is applied to the mounting portion 12 and the plate portion 12b breaks starting from the mounting hole 12c, the progression of the break in the mounting portion 12 can be suppressed.

[0038] In the example shown in FIG. 1, the height H3 of the protruding portion (mounting portion) 12 extending from the film portion 2 in a direction perpendicular to the film portion 2 is equal to the height H1 of the supporting wall portion 3 extending from the film portion 2 in a direction perpendicular to the film portion 2. However, this is not limited to such a configuration. In the modified example shown in FIG. 7, the height H3 of the protruding portion (mounting portion) 12 extending in a direction perpendicular to the film portion 2 is greater than the height H1 of the supporting wall portion 3 extending in a direction perpendicular to the film portion 2. According to this configuration, a gap is generated between the other member 14 attached to the mounting portion 12 and the tip of the supporting wall portion 3, and an air layer 16 exists in this gap. This forms a hollow double-wall structure, improving sound insulation in a wide frequency band.

[0039] As described above, in the soundproof structure 10 of this embodiment, the spring mass resonator constituted by the spring portion 4a and the mass portion 4b of the weight portion 4 of the soundproof structure 1 functions well, and excellent sound insulation is obtained. The film portion 2, the support wall portion 3, and the weight portion 4 of this embodiment are all relatively light in weight, and the dimensions in the direction perpendicular to the film portion 2 are relatively small. Thus, the soundproof structure 1 of the soundproof structure of this embodiment is lightweight and thin, yet provides high sound insulation in a specific frequency range (for example, 1000 Hz or less) as described above. Furthermore, by having the mounting portion 12 consisting of a protruding portion, the opposite side of the film portion 2 of the soundproof structure 10 can be easily and stably mounted to another member 14.

[0040] Fig. 8(A) is a perspective view of a soundproof structure 10 of a modification of the first embodiment of the present invention, and Fig. 8(B) is a cross-sectional view taken along line AA in Fig. 8(A). Fig. 9(A) is a cross-sectional view of the soundproof structure 10 of another modification, and Fig. 9(B) is a perspective view of the weight portion 4 of the soundproof structure 1 of the soundproof structure 10. Fig. 10(A) is a cross-sectional view of a soundproof structure 10 of yet another modification, and Fig. 10(B) is a perspective view of the weight portion 4 of the soundproof structure 1 of the soundproof structure 10. In these modifications, the spring portion 4a and the mass portion 4b of the weight portion 4 have different shapes and different dimensions. In the modifications shown in Figs. 8(A) and 8(B), the spring portion 4a is a small-diameter cylindrical portion, and the mass portion 4b is a large-diameter cylindrical portion. In the modified example shown in Figs. 9(A) and 9(B), the spring portion 4a is elongated and cylindrical, the mass portion 4b is spherical, and the diameter of the cross-sectional shape of the cylindrical spring portion 4a is smaller than the diameter of the spherical mass portion 4b. In the modified example shown in Figs. 10(A) and 10(B), the spring portion 4a is truncated cone, the mass portion 4b is cylindrical, and the diameter of the smallest part of the truncated cone spring portion 4a is substantially equal to the diameter of the cylindrical mass portion 4b. In the modified example shown in Figs. 8(A) to 9(B), the mass portion 4b has a larger volume than the spring portion 4a. Therefore, even if the spring portion 4a and the mass portion 4b are made of the same material, the mass portion 4b has a larger mass than the spring portion 4a, and a spring-mass resonator can be formed. However, in this modified example, the spring portion 4a and the mass portion 4b may be made of different materials, and the mass portion 4b may have a larger mass than the spring portion. On the other hand, in the modified example shown in Figures 10(A) and 10(B), the spring portion 4a has a larger volume than the mass portion 4b. In this case, the mass portion 4b is made of a material having a higher density than the spring portion 4a, and the mass portion 4b has a larger mass than the spring portion, so that a spring-mass resonator can be formed. If the spring portion 4a has a truncated cone shape tapered in the direction away from the membrane portion 2 as in the modified example shown in Figures 10(A) and 10(B), the membrane portion 2 and the spring portion 4a can be easily releasable from a mold when they are integrally molded.

[0041] In this embodiment, the spring portion 4a and the mass portion 4b of the weight portion 4 are made different in either material or volume or both, so that the mass portion 4b has a larger mass than the spring portion 4a to configure a spring mass resonator and obtain a sufficient sound insulation effect. That is, the material, shape, and dimensions of the spring portion 4a and the mass portion 4b are determined so that a spring mass resonator that can provide a sufficient sound insulation effect can be configured. As long as the mass of the mass portion 4b can be made larger than the spring portion 4a to the extent that a spring mass resonator that can provide a sufficient sound insulation effect can be configured in this way, the material, shape, and dimensions of the spring portion 4a and the mass portion 4b can be freely selected. However, the spring portion 4a needs to be made of a flexible material in order to function as a spring.

[0042] [Second embodiment] FIG. 11(A) is a perspective view of a soundproof structure 15 according to a second embodiment of the present invention, and FIG. 11(B) is a cross-sectional view taken along line AA in FIG. 11(A). The soundproof structure 15 according to this embodiment has an attachment portion 12 similar to the example shown in FIGS. 1 to 5 in the outside soundproof structure area 11. The soundproof structure 6 according to this embodiment has a weight portion 7 of a single structure that is not divided into a spring portion and a mass portion. In this embodiment, a spring mass resonator is configured in which the entire weight portion 7 functions as the mass portion and the film portion 2 functions as the spring portion. As an example, the weight portion 7 has a mass of about 0.1 g to 2.0 g. The material of the weight portion 7 is not limited, and it is made of, for example, synthetic resin or metal. Other configurations are the same as those of the first embodiment described above, and therefore description thereof will be omitted. In the sound insulation structure 6 of this embodiment, too, the membrane vibration is controlled by the action of the spring mass resonator formed by the weight portion 7 and the membrane portion 2, and the membrane vibration is significantly reduced in a specific frequency range (for example, 1000 Hz or less), providing high sound insulation. Note that, together with the membrane portion 2, the air in the space surrounded by the membrane portion 2 and the support wall portion 3 may function as part of the spring of the spring mass resonator (air spring).

[0043] In both the film part 2 and the supporting wall part 3 of this embodiment, it is preferable that the dynamic storage modulus (E') at 23° C. and at a frequency of 1 Hz to 1000 Hz is 0.01 MPa or more and 100 MPa or less, and the loss tangent (tan δ) at 23° C. and at a frequency of 1 Hz to 1000 Hz is 0.01 or more and 0.50 or less. Furthermore, it is more preferable that the dynamic storage modulus (E') at 23° C. and at a frequency of 1 Hz to 1000 Hz is 0.05 MPa or more and 50 MPa or less, and the loss tangent (tan δ) at 23° C. and at a frequency of 1 Hz to 1000 Hz is 0.05 or more and 0.50 or less.

[0044] The support wall 3 of this embodiment is made of any one of a material having no energy elasticity but rubber elasticity, a material having no rubber elasticity but energy elasticity, and a material having both rubber elasticity and energy elasticity. Similarly, the membrane 2 of this embodiment is made of any one of a material having no energy elasticity but rubber elasticity, a material having no rubber elasticity but energy elasticity, and a material having both rubber elasticity and energy elasticity.

[0045] Fig. 12(A) is a cross-sectional view of a soundproof structure 15 according to a modified example of the second embodiment of the present invention, and Fig. 12(B) is a perspective view of the weight portion 7 of the soundproof structure 6 of the soundproof structure 15. In this modified example, the weight portion 7 has a truncated cone shape that tapers away from the film portion 2. With this configuration, the film portion 2 and the weight portion 7 are easily releasable from a mold when they are integrally molded. In this embodiment, the shape of the weight portion 7 can be determined arbitrarily and is not particularly limited.

[0046] In any of the first and second embodiments, the film portion 2 and the supporting wall portion 3 can be formed by integral molding or two-color molding using the above-mentioned materials by injection molding, compression molding, press molding, extrusion molding, transfer molding, casting, etc. Furthermore, the weight portions 4, 7 can also be formed by integral molding, two-color molding, insert molding, etc. together with the film portion 2 and the supporting wall portion 3 using the above-mentioned materials. However, the film portion 2, the supporting wall portion 3, and the weight portions 4, 7 may be formed separately, and then joined together by adhesion or heat fusion to assemble the sound insulation structures 1, 6.

[0047] In the configuration of the sound insulation structure 1, 6 described above, as shown in Figs. 13(A) and 13(B), the support wall 3 includes a plurality of first wall portions 3a extending in a first direction D1 parallel to the film portion 2 and a plurality of second wall portions 3b extending in a second direction D2 perpendicular to the first direction D1, and the planar shape of each section 5 is a square. In other words, the support wall 3 is a square tube having a square cross-sectional shape that defines each section 5, and a large number of square tube-shaped support walls 3 are arranged side by side, and the support walls 3 of adjacent sections 5 are integrated. However, the configuration is not limited to this. For example, as shown in Figs. 14(A) and 14(B), the planar shape of each section 5 may be a triangle, and the support wall 3 may be a square tube having a triangular cross-sectional shape that defines each section 5. As shown in Figs. 15(A) and 15(B), the planar shape of each section 5 may be pentagonal, and the support wall 3 may be a square tube having a pentagonal cross-sectional shape that defines each section 5. As shown in Figs. 16(A) and 16(B), the planar shape of each section 5 may be hexagonal, and the support wall 3 may be a square tube having a hexagonal cross-sectional shape that defines each section 5, forming a so-called honeycomb structure. Furthermore, as shown in Figs. 17(A) and 17(B), the planar shape of each section 5 may be circular, and the support wall 3 may be a cylinder having a circular cross-sectional shape that defines each section 5. In the case of the configuration shown in Figs. 15(A), 15(B), 17(A), and 17(B), gaps are generated between the sections 5, so it is preferable to determine the shape and dimensions of the support wall 3 so as to reduce the gaps. In the configurations shown in Figures 13(A), 13(B), 14(A), 14(B), 16(A), and 16(B), no gaps are generated between the compartments 5. Furthermore, each compartment 5 may have various shapes (not shown), such as a rectangle, a parallelogram, a trapezoid, a polygon with seven or more sides, an ellipse, an oval, or an irregular shape. The support wall portion 3 is formed to have a shape and dimensions that match the planar shape of each compartment 5.

[0048] Further, the external shape of the sound insulation structure 1,6 is not particularly limited. The external shape of the sound insulation structure 1,6 may be an irregular shape (e.g., a modified pentagon), and in that case, the sound insulation structure outer area 11 may be arranged so as to incorporate the sound insulation structure 1,6 in a shape approximately similar to the external shape of the sound insulation structure 1,6. As an example, as shown in Fig. 18, a plurality of mounting parts 12 are provided in the sound insulation structure outer area 11 of the soundproof structure 10,15, and the soundproof structure 10,15 is attached to another member 14 such as a door panel of an automobile. The number, shape, and position of the mounting parts 12 are not limited, and may be appropriately set according to the structure and use of the other member 14 such as the automobile panel.

[0049] The soundproofing structures 10 and 15 of the present invention are very thin and lightweight, and can be easily placed on curved or uneven surfaces, so they may be placed on the panels of vehicles, particularly automobiles, for use. Automobile panels are basically non-permeable plates, and examples thereof include metal plates (iron plates, steel plates, aluminum plates) and resin plates. When the panel on which the soundproofing structures 10 and 15 are placed is a metal plate, its thickness is preferably in the range of 0.5 mm to 2.0 mm, and when it is a resin plate, its thickness is preferably in the range of 0.5 mm to 20 mm. The end face of the side wall portion 12a of the mounting portion 12 of the soundproofing structures 10 and 15 opposite to the side attached to the film portion 2 is attached to another member (such as the panel of the automobile) 14.

[0050] The soundproof structure 10, 15 of the present invention may be used alone or in combination with other members (not shown). When the soundproof structure 10, 15 of the present invention is used in combination with other members, it may be laminated or joined to the other members. When laminated or joined to other members, the soundproof structure 10, 15 may be placed so as to be in contact with a portion (e.g., an automobile panel) on which the soundproof structure 10, 15 is placed, or the other members may be placed so as to be in contact with the portion. The other members used in combination with the soundproof structure 10, 15 may be made of various materials.

[0051] Examples of locations in which the soundproofing structures 10, 15 of the present invention are installed in an automobile include, in the engine compartment, engine head covers, engine body covers, hood insulators, front-dash insulators, air box walls, air intake cleaners, dust side ducts, and under covers; in the cabin, examples include dash insulators, dash panels, floor carpets (floor silencers), spacers, door trims, the inside of door trims, instrument panels, instrument center boxes, instrument upper boxes, air conditioner housings, roof trims, the inside of roof trims, sun visors, air conditioning ducts for rear seats, cooling ducts of battery cooling systems in battery-equipped vehicles, cooling fans, center console trims, the inside of the console, parcel trims, parcel panels, seat headrests, front seat backs, and rear seat backs; and in the trunk, examples include trunk side trims, the inside of trims, and drafter covers. In addition, the soundproof structures 10, 15 of the present invention can be installed within the frame of an automobile or between panels, and can also be installed outside the automobile in under-floor under-covers, fender protectors, back doors, wheel covers, aerodynamic covers for suspensions, and the like.

[0052] As described above, in the soundproof structures 10 and 15 of the present invention, the film 2 and the supporting wall 3 of the soundproof structures 1 and 6 each have a dynamic storage modulus of 0.01 MPa to 100 MPa and a loss tangent of 0.01 to 0.50 at 23° C. and at a frequency of 1 Hz to 1000 Hz, respectively. The thickness of the film 2 is 0.001 to 1 mm, and the area of ​​each of the sections 5 separated by the supporting wall is 100 mm. 2 More than 1000mm 2 When the spring portion 4a and the mass portion 4b of the weight portion 4 form a spring-mass resonator, if the spring portion 4a has a dynamic storage modulus of 0.01 MPa or more and 100 MPa or less at 23° C. and a loss tangent of 0.01 or more and 0.50 or less at a frequency of 1 Hz to 1000 Hz, this contributes to improved sound insulation.

[0053] Moreover, it is preferable that the height H3 of the protruding portion (mounting portion) 12 is 1 mm or more and 1000 mm or less, and the film thickness is 0.1 mm or more and 10 mm or less. If the height of the protruding portion 12 is less than 1000 mm, it is not necessary to consider the problem of space, and it can be easily installed in the product. If the height H3 of the protruding portion 12 is greater than the height H1 of the supporting wall portion 3, an air layer 16 is generated, and a hollow double-wall structure is formed, which makes it possible to improve the sound insulation performance in a wide frequency band. If the thickness of the side wall portion 12a is greater than 0.1 mm, there is little risk of the protruding portion (mounting portion) 12 being torn when fastened with a mounting tool 13 such as a clip. If the thickness of the side wall portion 12a is less than 10 mm, the size and weight of the entire sound insulation structure 1 can be suppressed, and when placed on a panel of a vehicle, the sound insulation structure 1 does not occupy a large space inside the vehicle, the space efficiency is not reduced, and there is little risk of it interfering with the installation of other members. However, the thickness of the side wall portion 12a may vary partially. It is preferable that the dynamic storage modulus of the protrusion 12 at 23° C. and at a frequency of 1 Hz to 1000 Hz is 0.01 MPa or more and 100 MPa or less, and the loss tangent is 0.01 or more and 0.50 or less. The shape of the protrusions that configure the mounting portion 12 provides high rigidity to the mounting portion 12 and its surroundings.

[0054] Specific examples and comparative examples of the soundproof structure of the present invention will be described below. [Example 1] The soundproof structure 10 of Example 1 of the present invention shown in Fig. 19 has the same structure as the first embodiment shown in Figs. 1 to 5. The film portion 2 is made of EPDM having a durometer A hardness of 70 according to JIS K6253 and a film thickness of 1.0 mm. The film portion 2 has a dynamic storage modulus (E') of 20.4 MPa at 23°C and a frequency of 1 Hz, and a loss tangent (tan δ) of 0.12 at 23°C and a frequency of 1 Hz. The dynamic storage modulus (E') of 23.0 MPa at 23°C and a frequency of 10 Hz and a loss tangent (tan δ) of 0.13, the dynamic storage modulus (E') of 25.4 MPa at 23°C and a frequency of 100 Hz and a loss tangent (tan δ) of 0.16, and the dynamic storage modulus (E') of 28.8 MPa at 23°C and a frequency of 1000 Hz and a frequency of 1000 Hz. The support wall 3 in this embodiment is made of EPDM having a durometer A hardness of 30 and a plate thickness of 1.6 mm. The height of the support wall 3 (the dimension in the direction perpendicular to the membrane 2) is 10 mm. The section 5 defined by the multiple support walls 3 (the first wall 3a and the second wall 3b) is a square shape of 25 mm x 25 mm, and there are 49 sections 5 in a square area (evaluation surface) of 200 mm x 200 mm of the membrane 2. However, only a part of this area is shown diagrammatically in the drawing.

[0055] In this embodiment, weight portion 4 is cylindrical with a diameter of 6 mm and a height (dimension in the direction perpendicular to film portion 2) of 6 mm. Of weight portion 4, spring portion 4a, which is the portion attached to film portion 2, is 3 mm in height and is made of an elastic body having a dynamic storage modulus (E') of 0.01 MPa or more and 100 MPa or less at 23°C and at frequencies of 1 Hz to 1000 Hz, and a loss tangent (tan δ) of 0.01 or more and 0.50 or less at 23°C and at frequencies of 1 Hz to 1000 Hz. More specifically, the spring portion 4a in this embodiment has a dynamic storage modulus (E') of 0.60 MPa and a loss tangent (tan δ) of 0.17 at 23° C. and a frequency of 1 Hz, a dynamic storage modulus (E') of 0.74 MPa and a loss tangent (tan δ) of 0.24 at 23° C. and a frequency of 10 Hz, a dynamic storage modulus (E') of 0.97 MPa and a loss tangent (tan δ) of 0.17 at 23° C. and a frequency of 100 Hz, and a dynamic storage modulus (E') of 1.31 MPa and a loss tangent (tan δ) of 0.16 at 23° C. and a frequency of 1000 Hz, and is made of silicone rubber with a durometer A hardness of 10 according to JIS K6253. The mass portion 4b, which is the portion of the weight portion 4 opposite to the side attached to the membrane portion 2, also has a height of 3 mm and is made of stainless steel (SUS304) having rigidity. Mass 4 has a mass of approximately 0.8 g, and has a resonance that shows a peak frequency at 600 Hz to 650 Hz in the direction perpendicular to the surface on which mass 4 is placed.

[0056] In this embodiment, the other member 14 to which the mounting portion 12 is attached is a stainless steel plate having a thickness of 0.8 mm. The mounting portion 12 in this embodiment is made of EPDM having a durometer A hardness of 30, like the supporting wall portion 3, and the height H3 of the protruding portion (mounting portion) 12 extending in a direction perpendicular to the film portion 2 is 10 mm, which is the same as the height H1 of the supporting wall portion 3 extending in a direction perpendicular to the film portion 2, so that no air layer exists between the tip of the supporting wall portion 3 and the other member 14. The height of the entire structure including the soundproof structure 10 and the other member 14 in this embodiment is 11.8 mm, and the surface density is 8.62 kg / m 2 It is.

[0057] In this way, the end face of the side wall portion 12a of the soundproof structure 10 opposite to the film portion 2 was placed on the other member 14, which is a stainless steel plate having a thickness of 0.8 mm, and the surface of the other member 14 opposite to the side on which the soundproof structure 10 was placed was set as the incident sound side, and the sound insulation was measured. Specifically, in accordance with the sound intensity method shown in JIS A1441-1, a test equipment room in which the sound source room was a reverberation room and the sound receiving room was a semi-anechoic room was used, and the sound transmission loss (transmission loss) [dB] was obtained for the 1 / 3 octave band center frequency [Hz] by 1 / 3 octave band analysis. The relationship between the 1 / 3 octave band center frequency and the sound transmission loss was obtained and is shown in Table 1 and Figures 20 to 21. The larger the sound transmission loss, the higher the sound insulation. In the 1 / 3 octave band center frequency [Hz] shown in Figures 20 to 22, 1 kHz is 1000 Hz, and the prefix "k" means 1000.

[0058] [Table 1]

[0059] [Example 2] The sound insulation structure 1 of Example 2 of the present invention has the same structure as the modified example of the first embodiment shown in FIG. 7. The sound insulation structure 1 of this example is the same as the sound insulation structure 1 of Example 1. The height H3 of the protruding part of the mounting part 12 of this example is 15 mm, which is greater than the height H1 (10 mm) of the support wall part 3. Therefore, an air layer 16 having a thickness of 5 mm exists between the other member 14 attached to the mounting part 12 and the tip of the support wall part 3. The rest of the configuration is the same as in Example 1, so a description thereof will be omitted. The height of the entire configuration including the soundproof structure 10 and the other member 14 of this example is 16.8 mm, and the surface density is 8.62 kg / m 2 The sound transmission loss (transmission loss) [dB] of the soundproof structure 10 was determined in the same manner as in Example 1, and is shown in Table 1 and FIGS.

[0060] [Comparative Example 1] As Comparative Example 1, a structure having only a membrane part 2 and an attachment part 12 was produced, as shown in Fig. 23. The membrane part 2 is made of EPDM with a durometer A hardness of 30 and a film thickness of 2 mm. The attachment part 12 is formed on this membrane part 2 by a protruding part consisting of a side wall part 12a, a plate part 12b, and an attachment hole 12c, similar to Example 1. The height of the protruding part (attachment part) 12 is 9 mm. Therefore, an air layer 16 having a thickness of 9 mm exists between the membrane part 2 and the other member 14. The height of the entire structure of this Comparative Example is 11.8 mm, and the surface density is 8.49 kg / m 2 The sound transmission loss (transmission loss) [dB] of this structure was determined in the same manner as in Example 1, and is shown in Table 1 and FIG.

[0061] [Comparative Example 2] As Comparative Example 2, a structure having only a membrane part 2 and an attachment part 12 was produced, as shown in Fig. 24. The height of the protruding part (attachment part) 12 in this comparative example is 13 mm, and an air layer 16 having a thickness of 13 mm exists between the membrane part 2 and the other member 14. The height of the entire structure in this comparative example is 15.8 mm, and the surface density is 8.49 kg / m 2 The sound transmission loss (transmission loss) [dB] of this structure was determined in the same manner as in Example 1, and is shown in Table 1 and FIG.

[0062] [Comparative Example 3] As Comparative Example 3, a member having the same mass as the sound insulation structure 1 of Example 1 was placed on a 0.8 mm thick stainless steel plate, which is the other member 14. The theoretical sound insulation value calculated based on the mass law was obtained, and the relationship between the 1 / 3 octave band center frequency and the sound transmission loss is shown in Table 1 and Figure 20. The surface density of this structure is 8.62 kg / m 2 It is.

[0063] [result] The results of comparing the above-mentioned Examples 1 and 2 of the present invention with Comparative Examples 1 to 3 will be described. Referring to Figs. 20 to 22, it can be seen that the soundproofing structure 10 of the present invention improves the soundproofing effect. In particular, the soundproofing structure 10 of Example 1 provides a significantly greater soundproofing effect than the theoretical value based on the mass law (Comparative Example 3), and it can be seen that the effect of the present invention is particularly large in the frequency band of 1 kHz or less. In addition, in Example 2, since an air layer 16 exists between the other member 14 attached to the mounting portion 12 and the tip of the support wall portion 3, the hollow double wall effect increases the soundproofing especially on the high frequency side, and high soundproofing can be obtained in a wide frequency band. However, it can be seen that the mere existence of the air layer 16 as in Comparative Examples 1 and 2 does not provide a very large soundproofing effect, and that the presence of the soundproofing structure portion 1 as in Examples 1 and 2 provides a large soundproofing effect.

[0064] The present invention may have the following configuration. [1] A sound-insulating structure portion and a sound-insulating structure outer region located outside the sound-insulating structure portion in a plan view, the sound-proof structure has an elastic membrane portion, an elastic supporting wall portion standing on the membrane portion, and a weight portion standing on the membrane portion, the membrane portion is divided into a plurality of compartments by the supporting wall portion, the weight portion is located inside all of the plurality of compartments or inside some of the plurality of compartments, and in the compartments in which the weight portion is located, one weight portion is disposed in each of the compartments, a height of the supporting wall portion extending in a direction perpendicular to the membrane portion is greater than a height of the weight portion extending in a direction perpendicular to the membrane portion, and each of the weight portions constitutes a spring-mass resonator having an elastic spring portion and a mass portion having a mass greater than that of the spring portion, The sound-insulating structure outer area is provided with an attachment portion that is attached to another member, The soundproof structure, wherein the mounting portion is a protrusion provided on the membrane portion in an area outside the soundproof structure and having a mounting hole. [2] The soundproofing structure described in [1], wherein the membrane portion, the supporting wall portion and the spring portion are all made of either a material that has no energy elasticity but has rubber elasticity, a material that has no rubber elasticity but has energy elasticity, or a material that has both rubber elasticity and energy elasticity. [3] The soundproof structure according to [1] or [2], wherein the membrane portion, the supporting wall portion and the spring portion all have a dynamic storage modulus of 0.01 MPa or more and 100 MPa or less at 23°C and at a frequency of 1 Hz to 1000 Hz. [4] A soundproof structure according to any one of [1] to [3], wherein the membrane portion, the supporting wall portion and the spring portion all have a loss tangent of 0.01 or more and 0.50 or less at 23°C and a frequency of 1 Hz to 1000 Hz. [5] A soundproofing structure described in any of [1] to [4], wherein the spring portion of the weight portion is located on the side of the weight portion that is attached to the membrane portion, and the mass portion is located on the side opposite the side of the weight portion that is attached to the membrane portion. [6] A soundproof structure according to any one of [1] to [5], wherein the mass portion of the weight portion has a larger volume than the spring portion. [7] A soundproof structure described in any one of [1] to [6], wherein the mass portion of the weight portion is made of a material having a higher density than the spring portion. [8] A sound-insulating structure portion and a sound-insulating structure outer region located outside the sound-insulating structure portion in a plan view, the sound-proof structure has an elastic membrane portion, an elastic supporting wall portion standing on the membrane portion, and a weight portion standing on the membrane portion, the membrane portion is divided into a plurality of compartments by the supporting wall portion, the weight portion is located inside all of the plurality of compartments or inside some of the plurality of compartments, and in the compartments in which the weight portion is located, one weight portion is disposed in each of the compartments, a height of the supporting wall portion extending in a direction perpendicular to the membrane portion is greater than a height of the weight portion extending in a direction perpendicular to the membrane portion, the membrane portion serves as a spring portion, and the weight portion serves as a mass portion to constitute a spring-mass resonator, The sound-insulating structure outer area is provided with an attachment portion that is attached to another member, The soundproof structure, wherein the mounting portion is a protrusion provided on the membrane portion in an area outside the soundproof structure and having a mounting hole. [9] The soundproofing structure described in [8], wherein both the membrane portion and the supporting wall portion are made of either a material that does not have energy elasticity but has rubber elasticity, a material that does not have rubber elasticity but has energy elasticity, or a material that has both rubber elasticity and energy elasticity.

[10] The soundproof structure according to [8] or [9], wherein the membrane portion and the supporting wall portion each have a dynamic storage modulus of 0.01 MPa or more and 100 MPa or less at 23°C and a frequency range of 1 Hz to 1000 Hz.

[11] The soundproof structure according to any one of [8] to

[10] , wherein the film portion and the supporting wall portion each have a loss tangent of 0.01 or more and 0.50 or less at 23°C and a frequency of 1 Hz to 1000 Hz.

[12] The membrane portion has an opening in the area outside the sound-insulating structure, A soundproofing structure as described in any of claims [1] to

[11] , wherein the protrusion has a hollow cylindrical or square tube-shaped side wall portion extending perpendicular to the membrane portion from the inner peripheral edge of the opening or from a position inside the inner peripheral edge in a planar view, a plate portion arranged in a position to block the hollow portion of the side wall portion on the opposite side to the membrane portion, and the mounting hole formed in the plate portion.

[13] The soundproof structure described in

[12] , wherein the protrusion and the support wall are integrally formed.

[14] A soundproofing structure as described in

[12] or

[13] , in which the plate portion is provided with a protrusion portion that protrudes toward the membrane portion side or the opposite side of the membrane portion.

[15] A soundproofing structure described in any of [1] to

[14] , wherein the height of the protrusion extending in a direction perpendicular to the membrane portion is greater than the height of the support wall portion extending in a direction perpendicular to the membrane portion.

[16] A soundproof structure described in any of [1] to

[15] , wherein the supporting wall portion includes a plurality of first wall portions extending in a direction perpendicular to the membrane portion and extending in a first direction parallel to the membrane portion, and a plurality of second wall portions extending in a direction perpendicular to the membrane portion and extending in a second direction perpendicular to the first direction.

[17] A soundproof structure described in any of [1] to

[16] , wherein the support wall portion is cylindrical having a circular, elliptical or oval cross-sectional shape that defines each of the compartments, or rectangular tubular having a polygonal cross-sectional shape that defines each of the compartments.

[18] The area of ​​each of said compartments is 100 mm 2 More than 1000mm 2 A soundproof structure according to any one of [1] to

[17] below.

[19] The area of ​​the membrane is 1000 cm 2 The soundproof structure according to any one of [1] to

[18] , wherein 10 to 1,000 of the compartments are provided per unit area.

[20] A soundproof structure described in any one of [1] to

[19] , wherein the plate thickness of the support wall portion is 0.5 mm or more and 5.0 mm or less.

[21] A soundproof structure according to any one of [1] to

[20] , wherein the thickness of the film portion is 0.1 mm or more and 3.0 mm or less.

[22] A soundproof structure described in any one of [1] to

[21] , wherein the height in a direction perpendicular to the membrane portion is 5 mm or more and 20 mm or less.

[23] A soundproof structure described in any one of [1] to

[22] , wherein the height of the support wall portion extending in a direction perpendicular to the membrane portion is 5 mm or more and 20 mm or less.

[24] The soundproof structure described in

[23] , wherein the height of the support wall portion extending in a direction perpendicular to the membrane portion is 10 mm or more and 20 mm or less.

[25] A soundproof structure according to any one of [1] to

[24] , wherein the height of the weight portion extending in a direction perpendicular to the membrane portion is 1 mm or more.

[26] A soundproof structure according to any one of [1] to

[25] , wherein the film portion has a Durometer A hardness of 30 or more, and the support wall portion has a Durometer A hardness of 1 or more and 90 or less. [Explanation of symbols]

[0065] 1,6 Sound insulation structure 2 Membrane part 2a opening 3 Support wall section 3a 1st wall 3b 2nd wall part 4,7 Weight 4a Spring part 4b Mass part 5 Plots 10,15 Soundproofing structure 11 Sound insulation structure outside area 12 Mounting part (protruding part) 12a Side wall part 12b Plate part 12c Mounting hole 12d protrusion 13 Mounting fixture 14 Other parts 16 Air Layer

Claims

1. a sound-insulating structure portion and a sound-insulating structure outer region located outside the sound-insulating structure portion in a plan view, the sound-proof structure has an elastic membrane portion, an elastic supporting wall portion standing on the membrane portion, and a weight portion standing on the membrane portion, the membrane portion is divided into a plurality of compartments by the supporting wall portion, the weight portion is located inside all of the plurality of compartments or inside some of the plurality of compartments, and in the compartment in which the weight portion is located, one weight portion is disposed in one of the compartments, a height of the supporting wall portion extending in a direction perpendicular to the membrane portion is greater than a height of the weight portion extending in a direction perpendicular to the membrane portion, and each of the weight portions constitutes a spring-mass resonator having an elastic spring portion and a mass portion having a mass greater than that of the spring portion, The sound-insulating structure outer area is provided with an attachment portion that is attached to another member, The soundproof structure, wherein the mounting portion is a protrusion provided on the membrane portion in an area outside the soundproof structure and having a mounting hole.

2. The soundproof structure of claim 1, wherein the membrane portion, the support wall portion and the spring portion are all made of a material that has no energy elasticity but has rubber elasticity, a material that has no rubber elasticity but has energy elasticity, or a material that has both rubber elasticity and energy elasticity.

3. 3. The soundproof structure according to claim 1, wherein the membrane portion, the support wall portion and the spring portion all have a dynamic storage modulus of 0.01 MPa or more and 100 MPa or less at 23° C. and at a frequency of 1 Hz to 1000 Hz.

4. 4. The soundproof structure according to claim 3, wherein the film portion, the support wall portion and the spring portion all have a loss tangent of 0.01 or more and 0.50 or less at 23° C. and a frequency range of 1 Hz to 1000 Hz.

5. 3. The soundproof structure according to claim 1, wherein the spring portion of the weight portion is located on the side of the weight portion that is attached to the membrane portion, and the mass portion is located on the opposite side of the weight portion to the side that is attached to the membrane portion.

6. The soundproof structure according to claim 5 , wherein the mass portion of the weight portion is larger in volume than the spring portion.

7. 3. The soundproof structure according to claim 1, wherein the mass portion of the weight portion is made of a material having a higher density than the spring portion.

8. a sound-insulating structure portion and a sound-insulating structure outer region located outside the sound-insulating structure portion in a plan view, the sound-proof structure has an elastic membrane portion, an elastic supporting wall portion standing on the membrane portion, and a weight portion standing on the membrane portion, the membrane portion being divided into a plurality of compartments by the supporting wall portion, the weight portion being located inside all of the plurality of compartments or inside some of the plurality of compartments, and in the compartments in which the weight portion is located, one weight portion is disposed in each of the compartments, the height of the supporting wall portion extending in a direction perpendicular to the membrane portion is greater than the height of the weight portion extending in a direction perpendicular to the membrane portion, the membrane portion serving as a spring portion and the weight portion serving as a mass portion constituting a spring-mass resonator, The sound-insulating structure outer area is provided with an attachment portion that is attached to another member, The soundproof structure, wherein the mounting portion is a protrusion provided on the membrane portion in an area outside the soundproof structure and having a mounting hole.

9. The soundproof structure according to claim 8, wherein the membrane portion and the support wall portion are made of any one of a material that has no energy elasticity but has rubber elasticity, a material that has no rubber elasticity but has energy elasticity, and a material that has both rubber elasticity and energy elasticity.

10. 10. The soundproof structure according to claim 8, wherein the film portion and the supporting wall portion each have a dynamic storage modulus of 0.01 MPa or more and 100 MPa or less at 23° C. and at a frequency of 1 Hz to 1000 Hz.

11. The soundproof structure according to claim 10, wherein the film portion and the supporting wall portion each have a loss tangent of 0.01 or more and 0.50 or less at 23° C. and a frequency range of 1 Hz to 1000 Hz.

12. The film portion has an opening in the area outside the sound-insulating structure, The soundproofing structure described in claim 1 or 8, wherein the protrusion has a hollow cylindrical or square tube-shaped side wall portion extending perpendicular to the membrane portion from the inner peripheral edge portion of the opening or from a position inside the inner peripheral edge portion in a planar view, a plate portion arranged in a position to block the hollow portion of the side wall portion on the opposite side to the membrane portion, and the mounting hole formed in the plate portion.

13. 13. The soundproof structure according to claim 12, wherein the protrusion and the support wall are integrally formed.

14. The soundproof structure according to claim 12 , wherein the plate portion is provided with a protrusion portion that protrudes toward the film portion side or toward the opposite side to the film portion.

15. 9. The soundproof structure according to claim 1, wherein a height of the protrusion in a direction perpendicular to the membrane is greater than a height of the support wall in a direction perpendicular to the membrane.

16. 9. The soundproof structure described in claim 1 or 8, wherein the support wall portion includes a plurality of first wall portions extending in a direction perpendicular to the membrane portion and extending in a first direction parallel to the membrane portion, and a plurality of second wall portions extending in a direction perpendicular to the membrane portion and extending in a second direction perpendicular to the first direction.

17. 9. The soundproof structure according to claim 1 or 8, wherein the support wall portion is cylindrical having a circular, elliptical or oval cross-sectional shape that defines each of the compartments, or is angular tubular having a polygonal cross-sectional shape that defines each of the compartments.

18. The area of ​​each of the compartments is 100 mm 2 More than 1000mm 2 9. The soundproof structure according to claim 1 or 8, wherein:

19. The area of ​​the membrane is 1000 cm 2 9. The soundproof structure according to claim 1, wherein 10 to 1000 of the compartments are provided per soundproof structure.

20. 9. The soundproof structure according to claim 1, wherein the plate thickness of the support wall portion is 0.5 mm or more and 5.0 mm or less.

21. 9. The soundproof structure according to claim 1, wherein the film thickness of the film portion is 0.1 mm or more and 3.0 mm or less.

22. 9. The soundproof structure according to claim 1, wherein the height in a direction perpendicular to the film portion is 5 mm or more and 20 mm or less.

23. 9. The soundproof structure according to claim 1, wherein the height of the support wall portion extending in a direction perpendicular to the membrane portion is 5 mm or more and 20 mm or less.

24. 24. The soundproof structure according to claim 23, wherein the height of the supporting wall portion extending in a direction perpendicular to the membrane portion is 10 mm or more and 20 mm or less.

25. 9. The soundproof structure according to claim 1, wherein the height of the weight portion extending in a direction perpendicular to the film portion is 1 mm or more.

26. 9. The soundproof structure according to claim 1, wherein the film portion has a durometer A hardness of 30 or more, and the support wall portion has a durometer A hardness of 1 or more and 90 or less.

Images