Resonant sheet component, and structure provided with the same

Abstract

To provide a resonant sheet component equipped with a resonator structural unit capable of designing resonant frequencies for two or more vibration modes in a direction perpendicular to the resonant sheet, and a structure provided with the resonant sheet component.SOLUTION: The inventors of the present invention have found that the above problem can be solved by adopting a sheet member comprising a rubber-elastic sheet having a protrusion with an internal space portion and a further protrusion provided within the space portion, and thus have completed the present invention.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present invention relates to a resonant sheet member and a structure including the same. [Background technology]

[0002] Generally, the performance of vibration-damping and sound-insulating materials follows the so-called mass law. In other words, the transmission loss, which is an indicator of the amount of noise reduction, is determined by the logarithm of the product of the mass of the vibration-damping and sound-insulating material and the frequency of the elastic wave or sound wave. Therefore, to achieve high sound-insulating performance, it is necessary to increase the weight and thickness of the sound-insulating material, which can make it difficult to achieve sufficient sound insulation within the weight and size constraints of actual applications.

[0003] To solve these problems of weight and size, improvements have been made to the structure of components. For example, methods such as combining multiple flat plates, hollow double-wall structures, and hollow triple-wall structures are known. Furthermore, to achieve sound insulation performance that exceeds the mass law, sheet components have been proposed that include a rubber-elastic sheet and a resonating part with a base and a weight. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. 2017 / 135409 Summary of the Invention [Problem to be solved by the invention]

[0005] The resonant sheet member described in Patent Document 1 offers high design freedom and versatility, enabling sound insulation and vibration control in the low-frequency range. However, the sheet protrusions acting as resonating parts have only one degree of freedom in the direction perpendicular to the surface to which the resonant sheet is attached. Therefore, sound insulation and vibration control performance is only achieved in a limited frequency band for vibrations perpendicular to the surface. Furthermore, it is not anticipated that a single type of sheet protrusion will have vibration control and sound insulation effects in multiple frequency bands. It is therefore difficult to achieve vibration control and sound insulation performance in two or more frequency bands and to independently adjust each of the multiple frequency bands in which performance is achieved. Therefore, to achieve sound insulation and vibration control in two or more frequency bands, it is necessary to combine multiple types of sheet protrusions depending on the number of target frequency bands. However, this increases the weight of the sheet protrusions, which creates a problem.

[0006] The present invention has been made in consideration of such problems, and its purpose is to provide a resonant sheet member equipped with a resonator structural unit that allows the design of resonant frequencies of two or more vibration modes in a direction perpendicular to the sheet in order to achieve sound insulation and vibration control effects in two or more frequency bands, and a structure equipped with the same.

[0007] In addition to the objectives stated here, the present invention can also be positioned as another objective of achieving effects that cannot be obtained by conventional technologies, which are derived from the various components shown in the detailed description of the invention described below. [Means for solving the problem]

[0008] As a result of intensive research into solving the above-mentioned problems, the inventors discovered that the above-mentioned problems could be solved by providing a convex portion with an internal space on a sheet having rubber elasticity, and employing a sheet member in which a further convex portion is provided in the space, thereby completing the present invention.

[0009] That is, the present invention provides various specific embodiments as shown below. [1] A sheet portion having rubber elasticity; at least one first convex portion having rubber elasticity and provided on at least one surface of the sheet portion, the first convex portion has a first space portion formed by a first wall portion and a first lid portion, The resonator sheet member has at least one second convex portion having rubber elasticity on a surface of the first cover portion facing the first space portion. [2] The resonator sheet member according to [1], wherein the first convex portion is provided on only one surface of the sheet portion. [3] The resonant sheet member according to either [1] or [2], wherein the sheet portion has a space portion, and the space portion of the sheet portion is provided so as to penetrate from the surface of the sheet portion opposite to the side on which the convex portion is provided to the space portion of the convex portion. [4] The resonator sheet member according to any one of [1] to [3], wherein the second convex portion has a second space portion. [5] The resonator sheet member according to any one of [1] to [4], wherein the second convex portion has a through hole connecting the outside and the second space portion. [6] The resonator sheet member according to any one of [1] to [5], wherein the second convex portion has a through hole connecting the first space portion and the second space portion. [7] The resonator sheet member according to [6], wherein the through-hole of the second convex portion is provided at the tip of the second convex portion. [8] The resonator sheet member according to any one of [1] to [7], wherein the second protrusion has a weight portion at its tip. [9] The resonator sheet member according to [8], wherein at least a portion of the weight portion is embedded in the second convex portion.

[10] The resonator sheet member according to any one of [1] to [9], which is an integrally molded product.

[11] The resonator sheet member according to any one of [1] to

[10] , wherein the sheet portion and the protrusions contain at least one selected from the group consisting of a thermosetting elastomer, a photocurable elastomer, and a thermoplastic elastomer.

[12] A sheet portion having rubber elasticity; the sheet portion has at least one first convex portion provided on at least one surface thereof, the first convex portion being composed of a first wall portion having rubber elasticity and a first lid portion; a first space formed by the first wall portion and the first lid portion; the first cover portion has a recessed portion that is convex toward the first space portion and has rubber elasticity, a resonant sheet member, wherein a second protrusion having rubber elasticity is provided on a surface of the first cover recess opposite to the first space portion;

[13] The resonant sheet member according to

[12] , wherein the sheet portion has a space portion, and the space portion of the sheet portion is provided so as to penetrate from the surface of the sheet portion opposite to the side on which the convex portion is provided to the space portion of the convex portion.

[14] The resonator sheet member according to

[12] or

[13] , wherein the second convex portion has a second space portion.

[15] The resonator sheet member according to

[14] , wherein the second space portion reaches the surface of the recess on the side of the first space portion.

[16] The resonator sheet member according to

[14] or

[15] , wherein the second convex portion has a through hole connecting the second space portion to the outside.

[17] The resonator sheet member according to any one of

[12] to

[16] , wherein a through hole is provided at the tip of the second protrusion.

[18] The resonator sheet member according to any one of

[12] to

[17] , wherein the second protrusion has a weight portion at its tip.

[19] The resonator sheet member according to

[18] , wherein at least a portion of the weight portion is embedded in the second convex portion.

[20] The resonator sheet member according to any one of

[12] to

[19] , which is an integrally molded product.

[21] The resonator sheet member according to any one of

[12] to

[20] , wherein the sheet portion and the protrusions contain at least one selected from the group consisting of a thermosetting elastomer, a photocurable elastomer, and a thermoplastic elastomer.

[22] A structure comprising at least the resonant sheet member according to any one of [1] to

[21] , and a support member that supports the resonant sheet member. [Effects of the Invention]

[0010] According to the present invention, it is possible to provide a resonant sheet member and a structure equipped with the same that can be installed in places with limited installation space, can provide low-frequency vibration damping and sound insulation, has vibration damping and sound insulation effects in multiple frequency bands for vibrations perpendicular to the installation surface, and can be designed for these frequency bands. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 2 is a schematic perspective view showing a resonator sheet member according to the first embodiment. [Figure 2] FIG. 2 is a cross-sectional view taken along the arrow II in FIG. [Figure 3] FIG. 2 is a cross-sectional view of a resonator sheet member according to the first embodiment. [Figure 4] FIG. 2 is a cross-sectional view of a resonator sheet member according to the first embodiment. [Figure 5] 4 is a cross-sectional view of a resonator sheet member according to the first embodiment, in which a weight is provided. FIG. [Figure 6] FIG. 10 is a diagram for explaining a method for evaluating the amount of sink marks. [Figure 7] FIG. 10 is a schematic perspective view showing a resonator sheet member according to a second embodiment. [Figure 8] FIG. 7 is a cross-sectional view taken along the line II-II in FIG. 6. [Figure 9] FIG. 10 is a cross-sectional view of a resonator sheet member according to a second embodiment. [Figure 10] FIG. 10 is a cross-sectional view of a resonator sheet member according to a second embodiment. [Figure 11] 10 is a cross-sectional view of a resonator sheet member according to a second embodiment, in which a weight is provided. FIG. [Figure 12] 4 is a cross-sectional view of a resonator sheet member showing one embodiment of a first space portion and a second space portion. FIG. [Figure 13] 1 is a schematic perspective view showing a structure including a resonator sheet member according to a first embodiment. [Figure 14] FIG. 10 is a schematic perspective view showing a structure including a resonator sheet member according to a second embodiment. [Figure 15]1 is a cross-sectional view of an example of a support body and a structure including the support body and a resonant sheet member. [Figure 16] 10A to 10C are diagrams illustrating an example of a manufacturing process for a resonator sheet member. [Figure 17] FIG. 1 is a schematic diagram of the unit cell used in the calculations of Experiments 1 and 2. [Figure 18] FIG. 1 is a schematic diagram of a unit cell used in the calculation of Experiment 1. [Figure 19] FIG. 1 is a schematic diagram of the unit cell used in the calculations of Experiments 1 and 2. [Figure 20] FIG. 1 is a schematic diagram of the unit cell used in the calculations of Experiments 1 and 2. [Figure 21] 10 is a graph showing the calculation results of the resonance frequency in the example. [Figure 22] 10 is a graph showing the calculation results of the resonance frequency in the example. [Figure 23] FIG. 1 is a schematic diagram illustrating the configuration of a structure used in Comparative Example 3-1. [Figure 24] FIG. 1 is a schematic diagram illustrating the structure used in Example 3-1. [Figure 25] FIG. 1 is a schematic diagram illustrating the configuration of a structure used in Comparative Example 4-1. [Figure 26] FIG. 1 is a schematic diagram illustrating the structure used in Example 4-1. [Figure 27] FIG. 1 is a schematic diagram of the vibrating body used in the calculation of Experiment 2. [Figure 28] 10 is a diagram showing the results of calculating the natural vibration modes and natural frequencies of the vibrating bodies in Comparative Example 3-1 and Example 3-1. FIG. [Figure 29] 10 is a graph showing the results of vibration response analysis in Comparative Example 3-1 and Example 3-1. [Figure 30] 10 is a graph showing the results of vibration response analysis in Comparative Example 4-1 and Example 4-1. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, each embodiment of the present invention will be described with reference to the drawings. Note that the following embodiments are examples for explaining the present invention, and the present invention is not limited to these embodiments. Furthermore, unless otherwise specified, the positional relationships such as up, down, left, and right will be based on the positional relationships shown in the drawings. Furthermore, the dimensional ratios of the drawings are not limited to the ratios shown. Note that in this specification, the notation of a numerical range, for example, "1 to 100," includes both the lower limit "1" and the upper limit "100." The same applies to the notation of other numerical ranges.

[0013] <Resonating sheet component> A resonant sheet member (also simply referred to as a "resonant sheet member") according to one embodiment of the present invention has a sheet portion having rubber elasticity and at least one first convex portion having rubber elasticity provided on at least one surface of the sheet portion, the first convex portion having a first space portion formed by a first wall portion and a first lid portion, and at least one second convex portion having rubber elasticity on the surface of the first lid portion facing the first space portion. Specific aspects of the present embodiment will be described below with reference to the drawings, but the present invention is not limited to these. In this specification, "plurality" means two or more.

[0014] First Embodiment FIG. 1 shows an example (first embodiment) of a resonator sheet member according to this embodiment. The resonator sheet member 100 shown in FIG. 1 includes a sheet portion 11 having rubber elasticity and at least one protruding portion 21 having rubber elasticity provided on one surface of the sheet portion 11, and at least the protruding portion 21 has a first space portion 12. Here, the protruding portion 21 is composed of a first wall portion 221, a first cover portion 222, and a second protruding portion 223. The sheet portion 11 has a seat surface 11a and a seat surface 11b. FIG. 2 is a cross-sectional view taken along arrow II in FIG. 1.

[0015] The resonant sheet member 100 shown in Figure 2 is in an embodiment in which both the sheet portion 11 and the convex portion 21 have a first space portion 12, and the convex portion 21 is composed of a convex forming portion 22 that is provided around the first space portion 12 and forms a convex shape, and the first space portion 12, and the convex forming portion 22 is composed of a first wall portion 221 and a first lid portion 222 that form the convex portion 21, and a second convex portion 223 provided on the first lid portion. The second convex portion 223 is formed on a cover inner wall surface 222', which is the inner wall surface on the first space side of the first cover portion 222. The presence of the second convex portion 223 adds a degree of freedom of vibration in the direction perpendicular to the parallel plane of the sheet portion 11, making it possible to cover a wider range of vibration-damping frequency bands and sound-insulating frequency bands. 2 is a line indicating the boundary between the sheet portion 11 and the protrusion 21. In Fig. 2, t1 is the thickness of the sheet portion 11, t2 is the height of the first wall portion 221, t3 is the height of the first lid portion 222, t4 is the height of the second protrusion 223, w1 is the width of the first wall portion 221, w2 is the cross-sectional width of the first space portion 12 in the planar direction of the sheet portion, and w3 is the diameter of the second protrusion.

[0016] The second convex portion 223 may have a second space 13 therein and may further have a through-hole that directly connects the second space 13 to the outside, as shown in Fig. 2. This embodiment is preferable from the viewpoint of lowering the resonant frequency. In Fig. 2, w4 denotes the cross-sectional width of the second convex portion 223.

[0017] The region of the sheet portion 11 where the convex portion 21 is provided is the region of the sheet portion 11 that overlaps with the convex portion 21 when the resonant sheet member 100 is viewed in a plane, and in Figure 2, it is the region of the sheet portion 11 having a width indicated by the sum of w1 and w2.

[0018] Examples of the resonator sheet member 100 are shown in FIGS. 3(a) to 3(d). The resonator sheet member 100 shown in FIG. 3(a) is configured such that both the sheet portion 11 and the protrusion 21 have the first space portion 12, similar to the resonator sheet member 100 shown in FIG. The resonator sheet member 100 shown in FIG. 3( b ) is an embodiment in which only the protrusion 21 has the first space 12 . 3(c) shows a resonant sheet member 100 in which both the sheet portion 11 and the protruding portion 21 have first spaces 12, and the first spaces 12 are provided so as to penetrate from the surface of the sheet portion 11 opposite to the side on which the protruding portion 21 is provided to the first spaces 12 of the protruding portion 21. From the viewpoint of achieving both ease of molding and sound insulation performance, this embodiment is preferable. The resonant sheet member 100 shown in Figure 3(d) has a configuration similar to that of the resonant sheet member 100 in Figure 3(c) above, and is configured such that the cross-sectional width w2-2 of the first space portion 12 of the sheet portion in the planar direction of the sheet portion is smaller than the cross-sectional width w2-1 of the first space portion 12r of the convex portion in the planar direction of the sheet portion. Furthermore, when the second convex portion has a second space, the convex portion may not have a through-hole connecting the second space to the outside. This through-hole is a through-hole that directly connects the convex portion to the outside, and does not include a through-hole that connects the first space of the convex portion to the outside via a sheet portion, as shown in Figure 3(c). From the viewpoint of improving sound insulation performance, this embodiment is preferred.

[0019] As shown in Fig. 5, the resonance frequency can be lowered by providing weight portion 23 on the second convex portion. This embodiment is preferable for achieving vibration damping and sound insulation effects in the low frequency band.

[0020] In this resonating sheet member 100, when sound waves are incident from a noise source on the sheet portion 11 side of the resonating sheet member, vibrations occur in the sheet portion 11 and / or the protruding portions 21. When the frequency of the incident sound waves and the resonant frequency of the protruding portions 21 are close to or coincident with each other, the protruding portions resonate and vibrate violently. At this time, the two forces acting on the sheet portion 11, 1) the force generated by the sound waves and 2) the force generated by the vibration of the protruding portions 21, are in opposite directions, suppressing the vibration of the sheet portion 11. As a result, high sound insulation performance that surpasses the mass law is achieved. The resonant sheet member 100 of this embodiment can easily be made low-profile because it can achieve good sound insulation performance in a smaller size than general sound insulation members, and the size and shape of the convex portion, space portion, and sheet portion can be changed as appropriate depending on the installation environment and conditions, making it possible to install it in places with limited installation space. Each component of the resonator sheet member 100 will be described in detail below.

[0021] [Seat section] The sheet portion 11 has rubber elasticity. The form thereof is not particularly limited, but may have rubber elasticity due to molecular motion of a resin (organic polymer). The sheet portion 11 can also function as an oscillator (resonator) that vibrates at a certain frequency when sound waves are incident from a noise source. The sheet portion 11 may have a first space 12. As shown in FIG. 3(c), a portion of the first space 12 may extend to the surface of the sheet portion opposite the side on which the convex portions 21 are provided, or may be integrated with the first space 12 of the convex portions 21 as shown in FIG. 3(a). From the viewpoint of achieving both ease of molding and sound insulation performance, a preferred form is one in which the first space 12 is provided so as to penetrate from the surface of the sheet portion 11 opposite the side on which the convex portions 21 are provided to the first space 12 of the convex portions 21, as shown in FIG. 3(c).

[0022] The material constituting the sheet portion 11 preferably contains at least one selected from the group consisting of a thermosetting elastomer, a photocurable elastomer, and a thermoplastic elastomer, from the viewpoint of imparting rubber elasticity to the sheet portion. When manufacturing by casting using a metal mold or the like, it is necessary to fill the cavity on the mold surface with elastomer, but photocurable elastomers are preferred because they can fill the cavity in a relatively low-viscosity liquid state before curing, thereby increasing the filling rate.

[0023] Specific examples of materials constituting the sheet portion 11 include: Thermosetting resin elastomers such as vulcanized thermosetting resin elastomers such as chemically crosslinked natural rubber or synthetic rubber, urethane thermosetting resin elastomers, silicone thermosetting resin elastomers, fluorine thermosetting resin elastomers, and acrylic thermosetting resin elastomers; Photocurable elastomers such as acrylic photocurable elastomers, silicone photocurable elastomers, and epoxy photocurable elastomers; Examples of the thermoplastic elastomer include olefin-based thermoplastic elastomers, styrene-based thermoplastic elastomers, vinyl chloride-based thermoplastic elastomers, urethane-based thermoplastic elastomers, ester-based thermoplastic elastomers, amide-based thermoplastic elastomers, silicone-based thermoplastic elastomers, and acrylic-based thermoplastic elastomers. Further specific examples of the thermosetting elastomer, photocurable elastomer, and thermoplastic elastomer include rubber, such as natural rubber, isoprene rubber, butadiene rubber, styrene-butadiene rubber, chloroprene rubber, nitrile rubber, polyisobutylene rubber, ethylene-propylene rubber, chlorosulfonated polyethylene rubber, acrylic rubber, fluororubber, epichlorohydrin rubber, polyester rubber, urethane rubber, silicone rubber, and modified products thereof, but are not particularly limited thereto. These may be used alone or in combination of two or more. Among these, natural rubber, isoprene rubber, butadiene rubber, styrene-butadiene rubber, chloroprene rubber, nitrile rubber, polyisobutylene rubber, ethylene propylene rubber, chlorosulfonated polyethylene rubber, acrylic rubber, fluororubber, epichlorohydrin rubber, polyester rubber, urethane rubber, silicone rubber, and modified products thereof are preferred, with silicone rubber, acrylic rubber, or modified products thereof being more preferred. Use of these materials tends to result in excellent heat resistance and cold resistance.

[0024] The sheet portion 11 may contain various additives such as a flame retardant, an antioxidant, a plasticizer, a colorant, etc., so long as it is a sheet having so-called rubber elasticity. Flame retardants are additives that are blended into flammable materials to make them less flammable or to prevent them from igniting. Specific examples include, but are not limited to, bromine compounds such as pentabromodiphenyl ether, octabromodiphenyl ether, decabromodiphenyl ether, tetrabromobisphenol A, hexabromocyclododecane, and hexabromobenzene, phosphorus compounds such as triphenyl phosphate, chlorine compounds such as chlorinated paraffins, antimony compounds such as antimony trioxide, metal hydroxides such as aluminum hydroxide, nitrogen compounds such as melamine cyanurate, and boron compounds such as sodium borate. The antioxidant is an additive that is blended to prevent oxidative degradation, and specific examples thereof include, but are not limited to, phenol-based antioxidants, sulfur-based antioxidants, and phosphorus-based antioxidants. Furthermore, plasticizers are additives blended to improve flexibility and weather resistance, and specific examples thereof include, but are not limited to, phthalates, adipates, trimellitates, polyesters, phosphates, citrates, sebacates, azelates, maleates, silicone oils, mineral oils, vegetable oils, and modified products thereof. Furthermore, examples of colorants include dyes and pigments. These various additives may be used singly or in combination of two or more.

[0025] 1, the sheet portion 11 is formed in a square shape in plan view, but the shape is not particularly limited to this. Any shape in plan view can be used, such as a triangular shape, a rectangular shape, a trapezoidal shape, a diamond shape, a polygonal shape such as a pentagonal shape or a hexagonal shape, a circle shape, an ellipse shape, or an irregular shape not classified into any of the above.

[0026] There are no particular limitations on the thickness t1 of the sheet portion 11 and it can be set as appropriate. If the thickness t1 of the sheet portion 11 is thick, the resonance frequency of the protrusions 21 tends to shift to a lower frequency, and if the thickness t1 of the sheet portion 11 is thin, the resonance frequency of the protrusions 21 tends to shift to a higher frequency. From the viewpoints of sound insulation performance, mechanical strength, flexibility, ease of handling, etc., the thickness of the sheet portion 11 is preferably 10 μm or more, more preferably 50 μm or more, and even more preferably 100 μm or more. The thickness of the sheet portion 11 is preferably 2 mm or less, more preferably 1 mm or less, and even more preferably 500 μm or less. The thickness of the sheet portion 11 does not have to be uniform throughout the entire sheet portion. For example, depending on the manner in which the resonant sheet member 100 is installed or when it is desired to vary the sound insulation performance in different areas, the sheet portion may have a slope within the area that is recognized as a sheet. If the thickness of the sheet portion is not uniform, the thickness t1 of the sheet portion 11 is calculated as an average value. However, from the viewpoints of ease of molding and ensuring stable sound insulation performance, it is preferable that the thickness of the sheet portion 11 be uniform.

[0027] From the viewpoints of sound insulation performance, mechanical strength, flexibility, handling, productivity, etc., the sheet portion 11 preferably has a Young's modulus of 0.01 MPa or more, more preferably 0.1 MPa or more, and also preferably has a Young's modulus of 100 MPa or less, more preferably 10 MPa or less. Here, the Young's modulus in this specification means the ratio of the force (stress) acting per unit cross-sectional area of ​​a sample to the deformation rate (strain) when an external force is applied in one axial direction, and means the value of the storage elastic modulus at 25°C and 10 Hz measured by the forced vibration non-resonance method of JIS K 6394:2007 "Vulcanized rubber and thermoplastic rubber - Determination of dynamic properties -".

[0028] Furthermore, from the viewpoint of reducing the temperature dependency of sound insulation properties at low temperatures, it is preferable that the sheet portion 11 has a glass transition temperature of 0°C or lower. The lower the glass transition temperature of the sheet portion 11, the higher the cold resistance becomes, and the temperature dependency of the elastic modulus around 0°C decreases, which tends to make the sound insulation performance less dependent on the ambient temperature. The glass transition temperature of the sheet portion 11 is more preferably -10°C or lower, even more preferably -20°C or lower, and particularly preferably -30°C or lower. In this specification, the glass transition temperature of the sheet portion 11 means the peak temperature of the loss tangent in the dynamic viscoelasticity measurement, particularly the temperature dependency measurement, at a frequency of 10 Hz as described above.

[0029] [Convex] The protrusions 21 are provided on the sheet portion 11 and function as oscillators (resonators) that vibrate at a certain frequency when sound waves are incident from a noise source. The protrusions 21 function as resonators, thereby achieving vibration control and sound insulation at the resonant frequency. The protrusions 21 have first spaces 12. For example, as in the resonant sheet member 100 shown in FIG. 2, the protrusions 21 may be composed of the first spaces 12 extending from the sheet portion 11 and a protruding portion 22 surrounding the first spaces 12. The protrusions 21 effectively function as a resonator in which the tip-side portion of the protruding portion 22, particularly the portion distal to the first spaces 12, functions as a weight, and the rear end portion of the protruding portion 22 functions as a spring. Furthermore, the protrusions 21 also effectively function as a resonator in which the tip-side portion of the second protrusion 223 of the protruding portion 22 functions as a weight, and the rear end portion of the second protrusion 223 functions as a spring. By appropriately designing the thickness t3 of the first lid portion 222 shown in FIG. 2, it is possible to independently adjust the resonance frequency of the resonator in which the tip portion of the convex forming portion 22 functions as a weight and the rear end portion of the convex forming portion 22 functions as a spring, and the resonance frequency of the resonator in which the tip portion of the second convex portion 223 functions as a weight and the rear end portion of the second convex portion 223 functions as a spring. Unless otherwise specified, each parameter of the convex portion 21 described below represents the average value of the parameters of multiple convex portions. The tip portion of the convex portion 21 (convex forming portion 22) may specifically be a region closer to the tip of the end of the first space portion on the sheet side, or may also be the first lid portion region or the second convex portion region. However, from the viewpoint of ensuring the effects of the present invention, it is preferable to define it as the latter. Furthermore, the tip portion of the second convex portion 223 may specifically be a region closer to the tip of the end of the first space portion 12 opposite the sheet side, or may be a region closer to the tip of the end of the second space portion on the sheet side when a second space portion is provided in the second convex portion. The protrusions 21 may be provided on at least one surface of the sheet portion 11, and may be provided on only one surface or on both surfaces, but from the viewpoint of improving sound insulation performance, it is preferable that the protrusions 21 be provided on both surfaces. However, when a support body, which will be described later, is provided to form a structure, from the viewpoint of ease of manufacture and stabilization of performance, it is preferable that the protrusions 21 be provided on only one surface of the sheet portion 11. In addition, when multiple protrusions are provided on both sides of the sheet, the parameters related to the protrusions in this specification are treated as parameters of the multiple protrusions provided on one side unless otherwise specified. For example, the conditions for the height of the protrusions described below apply to the parameters (specifically, their average values) of the multiple protrusions provided on one side of the sheet. Furthermore, the parameters of the resonant sheet member in this embodiment are treated as parameters of the entire resonant sheet, including all of the protrusions on both sides of the sheet.

[0030] The arrangement, number, size, etc. of the protrusions 21 can be appropriately set according to the desired performance and are not particularly limited. The protrusions 21 are provided in contact with at least one surface of the sheet portion 11. 1, the resonator sheet member 100 has a plurality of protrusions 21 arranged at equal intervals in a grid pattern, but the arrangement of the protrusions 21 is not particularly limited to this. The protrusions 21 may be arranged, for example, in a staggered pattern or randomly. Because the sound-insulating mechanism using the resonator sheet member according to this embodiment does not utilize Bragg scattering like so-called phononic crystals, the protrusions 21 do not necessarily have to be arranged at regular, periodic intervals.

[0031] Furthermore, the number of protrusions 21 provided per unit area is not particularly limited as long as the protrusions 21 can be arranged so as not to come into contact with each other and interfere with each other. The maximum number of protrusions 21 per unit area varies depending on the shape of the protrusions 21, but for example, if the protrusions 21 are cylindrical, the height direction of the cylinder is set parallel to the sheet normal direction, and the cross-sectional diameter of the cylinder is 1 cm, the maximum number of protrusions 21 per unit area is 100 cm. 2 Preferably 100 or less per unit. The minimum number of the protrusions 21 per unit area is, for example, 100 cm when the protrusions 21 are cylindrical and are arranged so that the height direction of the cylinder is parallel to the sheet normal direction, and the cross-sectional diameter is 1 cm. 2 The number of protrusions 21 provided per sheet is preferably 1 or more, more preferably 10 or more, and even more preferably 50 or more. When the number of protrusions 21 provided is equal to or greater than the above-mentioned preferable lower limit, higher sound insulation performance tends to be obtained. Also, when the number is equal to or less than the above-mentioned preferable upper limit, it becomes easier to reduce the weight of the entire sheet.

[0032] When multiple protrusions 21 are provided, their heights (lengths in the normal direction of the sheet portion 11) may or may not be uniform. However, from the viewpoints of ease of molding and ensuring stable sound insulation performance, uniformity is preferable. The height of the tallest protrusion among the multiple protrusions 21 (maximum height of the protrusions 21) can be set appropriately depending on the desired performance and is not particularly limited. From the viewpoints of ease of molding and improving productivity, the maximum height of the protrusions 21 is preferably 100 μm or more, more preferably 500 μm or more, and even more preferably 1 mm or more. Furthermore, it is preferably 50 mm or less, more preferably 40 mm or less, and even more preferably 30 mm or less. By setting the height within the above preferred numerical range, the releasability of the sheet portion 11 provided with the protrusions 21 (i.e., the resonant sheet member 100) tends to be improved.

[0033] In a plane parallel to the seat surface 11a of the seat portion 11 at a height position where the sum of the cross-sectional areas of the plurality of protrusions 21 is maximum, the cross-sectional area of ​​the protrusion having the largest area among the cross sections of the protrusions included in the plane is 8000 mm 2 It is preferable that the length is less than 2000 mm. 2 It is more preferable that it is less than 500 mm 2 It is more preferable that the cross-sectional area of ​​the smallest convex portion is 50 μm or less. 2 It is preferable that the thickness is 8000 μm or more. 2 More preferably, it is 0.15 mm or more. 2 More preferably, it is equal to or greater than this.

[0034] 1, when the protrusions 21 are cylindrical, in a plane parallel to the seat surface 11a of the seat portion 11 at a height position where the sum of the cross-sectional areas of the protrusions 21 is greatest, the diameter of the largest circle among the cross sections of the protrusions included in the plane is preferably 100 mm or less, more preferably 50 mm or less, and even more preferably 25 mm or less. The diameter of the smallest circle is preferably 10 μm or more, more preferably 100 μm or more, and even more preferably 1 mm or more. By setting the cross-sectional area of ​​the protrusions 21 and the diameter of the circle in the case of a cylinder within the above-mentioned preferred numerical ranges, it is possible to ensure that a predetermined number or more of the protrusions 21 are provided on the seat surface 11a of the seat portion 11, thereby achieving better sound insulation performance and tending to further improve molding ease and productivity.

[0035] The height t3 of the first lid portion 222 of the convex portion 21 is not particularly limited and can be set as appropriate. From the viewpoints of ease of molding, productivity, and improved sound insulation performance, the maximum height of the first lid portion 222 is preferably 30 mm or less, more preferably 20 mm or less, and even more preferably 10 mm or less. The minimum height is preferably 10 μm or more, more preferably 100 μm or more, and even more preferably 500 μm or more. By appropriately designing the height t3 of the first lid portion 222, it becomes possible to independently adjust the resonance frequency of a resonator in which the tip portion of the convex-forming portion acts as a weight and the rear end portion of the convex-forming portion 22 acts as a spring, and the resonance frequency of a resonator in which the tip portion of the second convex portion 223 acts as a weight and the rear end portion of the second convex portion 223 acts as a spring.

[0036] Furthermore, at least one protrusion 21 is provided on at least one surface of the sheet portion 11, but the material constituting the protrusions 21, the arrangement, shape, size, and installation direction of the protrusions 21, etc. do not necessarily have to be the same for all of the multiple protrusions 21. By providing multiple types of protrusions 21 that are different in at least one of these, there may be obtained effects such as expanding the frequency range in which high sound insulation performance is exhibited.

[0037] The cross-sectional shape of the protrusions 21 is not particularly limited, and any shape can be adopted, such as a triangular prism, a rectangular prism, a trapezoidal prism, a polygonal prism such as a pentagonal prism or a hexagonal prism, a cylindrical prism, an elliptical prism, a truncated pyramid, a truncated cone, a pyramid, a cone, a cylinder, or an irregular shape not classified as any of the above. From the viewpoint of productivity, a rectangular prism or a cylindrical shape is preferable. The shape can be appropriately selected depending on the application from the viewpoints of sound insulation performance, manufacturing cost, handleability, etc.

[0038] [First space] It is sufficient that the first space 12 is provided at least in the convex portion 21, but to obtain good sound insulation performance, it is preferable that the first space 12 is provided in both the convex portion 21 and the region of the sheet portion 11 where the convex portion 21 is provided, and it is particularly preferable that one first space 12 is provided that is connected across both the convex portion 21 and the region of the sheet portion 11 where the convex portion 21 is provided. For example, as shown in Fig. 1 , the first space 12 may be provided continuously in the sheet portion 11 and the convex portion 21. In this specification, the region that combines each convex portion and the region of the sheet portion where the convex portion is provided is also referred to as a "composite region."

[0039] The resonant sheet member 100 can achieve the effect of lowering the resonant frequency or reducing the height by having a first space portion. Furthermore, as shown in Figure 3(c) or Figure 3(d), by configuring at least the sheet portion 11 to have a first space portion 12 and by configuring a portion of the first space portion 12 to reach the surface of the sheet portion 11 opposite the side on which the convex portion 21 is provided, further effects can be achieved as described below. When the resonator sheet member 100 is attached to a support, air may become trapped between the sheet portion 11 and the adherend. However, as shown in FIG. 3( c) or 3(d), if the resonator sheet member 100 is configured such that at least the sheet portion 11 has a first space 12 and a portion of the first space 12 extends to the surface of the sheet portion 11 opposite the side on which the protrusions 21 are provided, the first space exists at a portion of the contact area between the resonator sheet member and the support, allowing air to escape into the first space and allowing adhesive to fill between the resonator sheet member 100 and the adherend. This prevents the resonator sheet member 100 from peeling off, resulting in superior stability compared to when there is no first space at a portion of the contact area between the resonator sheet member and the support.

[0040] Furthermore, when adhesive is applied to bond the resonator sheet member and the support, the thickness of the adhesive can be uneven. However, with the resonator sheet member 100 shown in Figure 3(c) or 3(d), excess adhesive can escape into the recess under the sheet when the adhesive thickness is leveled, making it possible to make the thickness of the adhesive layer uniform.

[0041] Another problem is that, depending on the shape and molding method of the protrusions 21, shrinkage and / or thermal shrinkage of the resin during curing can cause sink marks at the rear ends of the protrusions 21. When sink marks occur, the thickness of the applied adhesive layer can become uneven. However, in the resonator sheet member 100 shown in FIG. 3(c) or 3(d), the area where the sink marks occur is originally hollow, so this uneven adhesion does not occur. Previous studies by the inventors have shown that the thickness of the adhesive layer affects sheet performance. The resonator sheet member 100 shown in FIG. 3(c) or 3(d), which allows for a uniform adhesive layer thickness, offers superior sheet performance stability compared to a case where there is no first space in part of the contact area between the resonator sheet member and the support.

[0042] The amount of sink marks on the convex portions when the above sink marks are evaluated by the following method is not particularly limited, but is usually 200 μm or less, preferably 100 μm or less, and more preferably 50 μm or less. In addition, although there is no preferred lower limit range, it may be 1 μm or more. (Method for evaluating the amount of sink marks) The resonator sheet component with the top surface of the convex portion fixed is maintained in an environment of 170°C, and then the temperature is lowered to 25°C. The maximum (Hmax) and minimum (Hmin) values ​​of the height H of the composite region (the sum of the height of the convex portion in the direction perpendicular to the plane of the sheet portion and the thickness of the sheet portion) are calculated, and the sink amount B can be evaluated using the following formula. The parameters Hmax, Hmin, and B are as shown in Figure 6. Note that the region surrounded by line segment A and line segment A' in Figure 6 is the composite region. Sink amount B (μm) = (Maximum height of composite area Hmax (μm)) - (Maximum height of composite area Hmin (μm))

[0043] 3(c), there is an advantage that manufacturing is easy because the cross-sectional area of ​​the first space 12 in the sheet portion plane direction is constant or approximately constant, or there is no portion where the cross-sectional area of ​​the first space 12 increases from the surface of the sheet portion 11 opposite the side where the protrusion 21 is provided to the first space 12. Since there is no portion where the cross-sectional area increases in this way, a manufacturing method can be used that uses a mold 61a with a recess and a mold 61b with a protrusion as shown in FIG.

[0044] The ratio of the first space portion 12 to the sheet portion 11 and the convex portion 21 is not particularly limited as long as it satisfies the range of this embodiment. The ratio of the first space portion 12 can be appropriately set so that the resonance frequency of the convex portion 21 matches the desired sound insulation frequency range. If the ratio of the first space portion 12 is large, the resonance frequency of the convex portion 21 tends to shift significantly to the low frequency side, but the strength of the convex portion 21 decreases because the ratio of the convex-forming portion 22 decreases. Also, if the ratio of the first space portion 12 is small, the ratio of the convex-forming portion 22 increases, so the strength of the convex portion 21 can be increased, but the shift of the resonance frequency of the convex portion 21 to the low frequency side tends to be smaller. The proportion of the area of ​​the first space 12 in the horizontal cross section of the protrusion 21 at which the proportion is greatest is preferably 20% or more, more preferably 30% or more, and even more preferably 40% or more, from the viewpoint of sound insulation performance. Moreover, from the viewpoints of mechanical strength, handleability, etc., this proportion is preferably 90% or less, more preferably 85% or less, and even more preferably 80% or less. From the viewpoint of sound insulation performance, the volume ratio of the first space portion 12 in the convex portion 21 is preferably 10% or more, more preferably 20% or more, even more preferably 30% or more, and is preferably 80% or less, more preferably 75% or less, even more preferably 70% or less. Furthermore, the volume proportion of the first space portion 12 in the composite region, which is the region combining each convex portion 21 and the region in the sheet portion 11 in which the convex portion 21 is provided, is preferably 10% or more, more preferably 20% or more, even more preferably 30% or more, from the standpoint of sound insulation performance, and is preferably 80% or less, more preferably 75% or less, even more preferably 70% or less.

[0045] [Second convex part] Convex portion 21 has second convex portion 223. Because the second convex portion is provided on the surface of the first cover portion facing the first space portion, the convex direction is opposite to that of the first convex portion and the second convex portion. By having the second convex portion, convex portion 21 has a degree of freedom of elastic vibration of second convex portion 223 in addition to the degree of freedom of elastic vibration of first wall portion 221 and first cover portion 222. In particular, since the stretching vibration of second convex portion 223 in a direction perpendicular to the resonating sheet surface is included in the natural vibration mode of convex portion 21, vibration damping effect and sound insulation effect can be obtained in the direction perpendicular to the resonating sheet surface. The mechanism by which the vibration damping and sound insulation effects are obtained by the stretching vibration of the second convex portion 223 in a direction perpendicular to the resonating sheet surface is not clear, but it is thought that the stretching vibration of the second convex portion 223 is excited in the opposite phase to the first wall portion 221 and first lid portion 222, which vibrate together with the sheet portion 11 excited by the input vibration or input sound wave, thereby suppressing the vibration of the first lid portion 222, first wall portion 221 and sheet portion 11.

[0046] The second convex portion 223 may have a second space 13 therein, or the interior may be filled with the material of the convex-forming portion described below. However, having a second space 13 is preferable because it reduces the elastic modulus of the second convex portion 223 and lowers the natural frequency of the stretching vibration mode. The second space 13 may have a through-hole. The through-hole may be located on the tip side of the second convex portion 223 as shown in FIG. 4( a), on the first cover portion 222 side where the second convex portion 223 is provided and connected to the outside as shown in FIG. 4( b), or in another location as shown in FIG. 4( c). The through-hole reduces the apparent elastic modulus that determines the natural frequency of the second convex portion 223, thereby lowering the resonant frequency caused by the second convex portion 223. The second space 13 may have multiple through-holes, or may be located so that the second space 13 connects the first space 12 to the outside as shown in FIG. 4( d). By connecting the first space portion 12 and the second space portion 13 to the outside in this manner, the elastic modulus of the convex portion 21 caused by the air in the space portion of the convex portion 21 can be reduced, and the resonant frequency can be lowered. Therefore, it is preferable to provide a through hole so that the second space portion 13 connects the first space portion 12 to the outside.

[0047] 4(d), the second space 13 may have through-holes on both the tip side and the sheet side of the convex portion 21. This embodiment is preferable in that it can reduce the elastic modulus and lower the frequency while maintaining the strength of the second convex portion 223.

[0048] 4(b) and 4(d), the cross-sectional area of ​​the second space 13 in the sheet portion plane direction is constant or approximately constant, or there is no portion where the cross-sectional area of ​​the second space 13 increases from the surface of the first lid portion 222 opposite to the surface on which the first space 12 and the second space 13 are provided to the second space 13, which has the advantage of facilitating manufacturing. Since there is no portion where the cross-sectional area increases, a manufacturing method can be used that uses a mold 61a with a recess and a mold 61b with a protrusion, as shown in FIG. 16, which will be described later.

[0049] As shown in Fig. 5, second convex portion 223 may have weight portion 23 at its tip. Providing weight portion 23 increases the vibration moment of second convex portion 223, thereby enabling the natural frequency of the stretching vibration of the second convex portion to be lowered, and therefore it is preferable to provide second convex portion 223 with weight portion 23. Furthermore, providing second convex portion 223 with weight portion 23 also has the effect of increasing the vibration moment of first cover portion 222 and first wall portion 221 because second convex portion 223 is connected to first cover portion 222 and first wall portion 221. Therefore, it is preferable to provide second convex portion 223 with weight portion 23 because it enables the natural frequencies of the natural vibration mode related to the vibration of first cover portion 222 and the natural vibration mode related to the vibration of first wall portion 221 to be lowered. Furthermore, even in an embodiment in which the second convex portion 223 has a weight portion 23 at the tip, similarly to an embodiment in which the second convex portion 223 does not have a weight portion 23, it is preferable that the second convex portion 223 has a second space portion 13, since this can lower the natural frequency. In addition, it is preferable that the second space portion 13 has a through hole, since this can further lower the natural frequency. Furthermore, it is preferable that the second space portion 13 has multiple through holes, thereby connecting the first space portion 12 and the outside via the second space portion 13, since this can further lower the natural frequency.

[0050] The position of the second protrusion 223 on the first lid portion 222 is not particularly limited, and it may be located in the center of the first wall portion 221 or may be located at a position offset from the center. At least one second protrusion 223 needs to be provided on the first lid portion, but multiple second protrusions 223 may also be provided. When multiple second protrusions 233 are provided on the first lid portion 222, the arrangement, number, size, etc. of the second protrusions can be appropriately set according to the desired performance and are not particularly limited. The arrangement may be, for example, a regular grid-like arrangement, or a random arrangement.

[0051] The height t4 of the second convex portion 223 is not particularly limited and can be set appropriately. From the viewpoints of ease of molding, productivity, and improved sound insulation performance, the maximum height of the second convex portion 223 is preferably 50 mm or less, more preferably 40 mm or less, and even more preferably 30 mm or less. The minimum height of the second convex portion 223 of the convex portion 21 is preferably 100 μm or more, more preferably 500 μm or more, and even more preferably 1 mm or more. Changing the height t4 of the second convex portion 223 makes it possible to adjust the resonance frequency of the resonator in which the tip portion of the second convex portion 223 acts as a weight and the rear portion of the second convex portion 223 acts as a spring.

[0052] 1, when the second protrusions 223 are cylindrical, in a plane parallel to the seat surface 11a of the seat portion 11 at a height position where the sum of the cross-sectional areas of the second protrusions is greatest, the diameter of the largest circle among the cross sections of the second protrusions 223 included in the plane is preferably 95 mm or less, more preferably 45 mm or less, and even more preferably 20 mm or less. The diameter of the smallest circle is preferably 10 μm or more, more preferably 100 μm or more, and even more preferably 1 mm or more. By setting the cross-sectional area of ​​the second protrusions 223 and the diameter of the circle in the case of a cylinder within the above-mentioned preferred ranges, better sound insulation performance can be obtained, and ease of molding and productivity also tend to be further improved.

[0053] When the second convex portion 223 has the second spatial portion 13, the maximum cross-sectional width w4 of the second convex portion 223 in a cross section parallel to the seat surface 11a, including the second spatial portion 13, is preferably 20 mm or less, more preferably 10 mm or less, and even more preferably 5 mm or less. The minimum cross-sectional width w4 of the second convex portion in a cross section including the second spatial portion 13 is preferably 10 μm or more, more preferably 100 μm or more, and even more preferably 1 mm or more. Setting the cross-sectional width w4 of the second convex portion in a cross section including the second spatial portion 13 within the above-described preferred range tends to improve molding ease, productivity, and sound insulation performance. Furthermore, changing the cross-sectional width w4 of the second convex portion makes it possible to adjust the resonant frequency of a resonator in which the tip end portion of the second convex portion 223 functions as a weight and the rear end portion of the second convex portion 223 functions as a spring.

[0054] The cross-sectional shape of the second convex portion 223 is not particularly limited, and any shape can be adopted, such as a triangular prism, a rectangular prism, a trapezoidal prism, a polygonal prism such as a pentagonal prism or a hexagonal prism, a cylindrical prism, an elliptical prism, a truncated pyramid, a truncated cone, a pyramid, a cone, a cylinder, or an irregular shape not classified as any of the above. From the viewpoint of productivity, a rectangular prism or a cylindrical shape is preferable. The shape can be appropriately selected depending on the application from the viewpoints of sound insulation performance, manufacturing cost, handleability, etc.

[0055] [Convex forming part] A plurality of convex forming portions 22 are provided on the seat surface 11a of the seat portion 11 in contact with each other, and are provided around the first space portion 12 to form a convex shape. The dimensional parameters of the first wall portion 221 and the first lid portion 222 that form the outer shape of the convex forming portion 22, and the second convex portion 223 provided on the first lid portion, are the same as the dimensional parameters that form the convex portion 21 described above. By appropriately designing these parameter values, it is possible to adjust a plurality of resonant frequencies.

[0056] The material of the convex-forming portion 22 (convex portion 21) is not particularly limited as long as it satisfies the required characteristics, and may be the same as or different from the material of the sheet portion, and the materials can be selected independently. For example, at least one selected from the group consisting of thermosetting elastomers, photocurable elastomers, thermoplastic elastomers, thermosetting resins, photocurable resins, and thermoplastic resins can be used. Among these, from the viewpoint of imparting rubber elasticity, it is preferable to use at least one type selected from the group consisting of thermosetting elastomers, photocurable elastomers, and thermoplastic elastomers, and examples of such types include those exemplified for the sheet portion 11 described above. Examples of thermosetting or photocurable resins include acrylic thermosetting resins, urethane thermosetting resins, silicone thermosetting resins, and epoxy thermosetting resins. Examples of thermoplastic resins include polyolefin thermoplastic resins, polyester thermoplastic resins, acrylic thermoplastic resins, urethane thermoplastic resins, and polycarbonate thermoplastic resins. Specific examples of the resin include polymers such as polyacrylonitrile, polyethylene terephthalate, polybutylene terephthalate, polyvinyl chloride, polychlorotrifluoroethylene, polyethylene, polypropylene, polynorbornene, polyether ether ketone, polyphenylene sulfide, polyarylate, polycarbonate, polystyrene, epoxy resin, and oxazine resin, but are not particularly limited to these. Specific examples of elastomers include vulcanized rubber such as chemically crosslinked natural rubber or synthetic rubber, isoprene rubber, butadiene rubber, styrene-butadiene rubber, chloroprene rubber, nitrile rubber, polyisobutylene rubber, ethylene propylene rubber, chlorosulfonated polyethylene rubber, acrylic rubber, fluororubber, epichlorohydrin rubber, polyester rubber, urethane rubber, silicone rubber and modified products thereof, polyacrylonitrile, polyethylene terephthalate, polybutylene terephthalate, polyvinyl chloride, polychlorotrifluoroethylene, polyethylene, polypropylene, polynorbornene, polyether ether ketone, polyphenylene sulfide, polyarylate, polycarbonate, polystyrene, epoxy resin, oxazine resin, and the like, but are not particularly limited to these. Of these, natural rubber, isoprene rubber, butadiene rubber, styrene-butadiene rubber, chloroprene rubber, nitrile rubber, polyisobutylene rubber, ethylene propylene rubber, chlorosulfonated polyethylene rubber, acrylic rubber, fluororubber, epichlorohydrin rubber, polyester rubber, urethane rubber, silicone rubber, and modified products thereof are preferred, and silicone rubber, acrylic rubber, and modified products thereof are more preferred from the viewpoint of excellent heat resistance and cold resistance. The above materials can be used alone or in combination of two or more.

[0057] Among these, the material of the convex-forming portion 22 is preferably the same as that of the sheet portion 11 described above, and elastomers are particularly preferred. If the sheet portion 11 and the convex-forming portion 22 contain the same elastomers, the sheet portion 11 and the convex-forming portion 22 can be easily molded integrally, dramatically improving productivity. That is, one particularly preferred embodiment is one in which the sheet portion 11 and the convex portion 21 (convex-forming portion 22) are an integrally molded product that both contain at least one selected from the group consisting of a thermosetting elastomer, a photocurable elastomer, and a thermoplastic elastomer.

[0058] The convex-forming portion 22 may be a two-color molded body or a multi-color molded body made of two or more materials. In this case, by using the same elastomer as the sheet portion 11 for the convex-forming portion 22 on the side (rear end side) that contacts the sheet portion 11, it becomes easy to integrally mold the sheet portion 11 and the convex-forming portion 22.

[0059] [Weight] The resonator sheet member according to the first embodiment may include a weight portion 23. The weight portion 23 is not particularly limited as long as it has a higher density than the convex portion 22. The weight portion 23 in the resonator sheet member 100 shown in FIG. 5 is formed in a generally cylindrical shape with a maximum diameter smaller than that of the second convex portion 223. The weight portion 23 is partially or entirely embedded in the convex portion 22 near the tip of the second convex portion 223. Because the weight portion 23, which functions as a weight for the resonator, is supported by the convex portion 22, which determines the spring constant, the resonant frequency of the convex portion 21 can be controlled by, for example, adjusting the spring constant by changing the shape or material (elastic modulus, mass) of the convex portion 22 or by changing the mass of the weight portion 23. Generally, the resonant frequency of the convex portion 21 tends to shift to a lower frequency as the elastic modulus of the convex portion 22 decreases. Furthermore, the resonant frequency of the convex portion 21 tends to shift to a lower frequency as the mass of the weight portion 23 increases.

[0060] The shape of the weight portion 23 is not particularly limited, but a plate-like shape is preferable from the viewpoint of adjusting the sound insulation performance and achieving a thinner shape. The plate-like shape of the weight portion 23 allows the center of gravity of the weight portion 23 to be positioned farther from the first cover portion 222 than when the weight portion 23 is a sphere or the like, which tends to increase the vibration moment of the second convex portion 223. For example, when the vibration moment of the second convex portion 223 is constant, the plate-like weight portion 23 can be made thinner than when the weight portion 23 is a sphere or the like. On the other hand, when the height of the weight portion 23 is constant, a plate-like weight can obtain a larger vibration moment than when the weight portion 23 is a sphere or the like. Furthermore, weight portion 23 may have a through hole, and examples of its shape include a doughnut shape, a washer shape, and a nut shape.

[0061] The material for the weight portion 23 may be appropriately selected taking into consideration the mass, cost, etc., and the type of material is not particularly limited. From the viewpoint of miniaturizing the resonator sheet member 100 and improving the sound insulation performance, the material for the weight portion 23 is preferably a material with a high specific gravity. Specifically, examples of the material for weight portion 23 include, but are not limited to, metals or alloys such as aluminum, stainless steel, iron, tungsten, gold, silver, copper, lead, zinc, and brass; inorganic glasses such as soda glass, quartz glass, and lead glass; and composites containing powder of these metals or alloys or these inorganic glasses in the resin material of convex-forming portion 22. The material, mass, and specific gravity of weight portion 23 may be determined so that the resonance frequency of convex portion 21 matches the desired sound-insulating frequency range. Among these, at least one selected from the group consisting of metals, alloys, and inorganic glass is preferred from the viewpoints of low cost, high specific gravity, etc. Note that specific gravity refers to the ratio of the mass of a material to the mass of the same volume of pure water at 4°C under a pressure of 1013.25 hPa, and in this specification, the value measured according to JIS K 0061 "Method for measuring density and specific gravity of chemical products" is used.

[0062] The surface of the weight part 23 may be subjected to a surface treatment in order to improve process suitability and member strength. For example, it is possible to carry out chemical treatment using a solvent or the like to increase adhesion with the convex forming portion 22, or to carry out physical treatment to increase the strength of the component by creating irregularities on the surface, but the method of surface treatment is not particularly limited.

[0063] From the viewpoint of improving sound insulation performance, the volume ratio of the weight portion 23 in the convex portion 21 is typically 1% by volume or more, preferably 5% by volume or more, more preferably 10% by volume or more, and even more preferably 20% by volume or more, relative to 100% by volume of the convex portion, and is typically 90% by volume or less, preferably 80% by volume or less, more preferably 70% by volume or less, and even more preferably 50% by volume or less.

[0064] 5, the weight 23 is embedded in the protruding portion 22 on the tip side of the second protruding portion 223, but the installation position is not particularly limited thereto. Although it varies depending on the shape, mass, elastic modulus, etc. of the protruding portion 22 and the weight 23, from the viewpoint of reducing the thickness and weight of the resonant sheet member 100 or improving the sound insulation performance, it is preferable to position the weight 23 so that the center of gravity (center of mass) of the second protruding portion 223 is located at least closer to the sheet side than the center in the height direction of the second protruding portion 223. Typically, the weight 23 is positioned offset toward the tip side from the center in the height direction of the second protruding portion 223. It should be noted that weight portion 23 may be completely embedded in convex forming portion 22 (convex portion 21), or at least a portion thereof may be embedded, or may be provided on convex forming portion 22 without being embedded in convex forming portion 22. From the viewpoint of preventing the weight portion from falling off, it is preferable that at least a portion of weight portion 23 is embedded in convex forming portion 22 (convex portion 21), and it is more preferable that weight portion 23 is completely embedded. Furthermore, the shape and height of the plurality of weights 23 included in the resonator sheet member may be the same or different.

[0065] Second Embodiment FIG. 7 shows another example (second embodiment) of the resonator sheet member according to this embodiment. The resonator sheet member 101 shown in FIG. 7 includes a rubber-elastic sheet portion 11 and a rubber-elastic convex portion 21 provided on one surface of the sheet portion 11. The convex portion 21 includes at least one first convex portion composed of a rubber-elastic first wall portion 221 and a rubber-elastic first cover portion 222. The first wall portion 221 and the first cover portion 222 define a first space portion 12. The first cover portion 222 includes a rubber-elastic concave portion 224 that is convex toward the first space portion 12, and a rubber-elastic second convex portion 223 on the surface of the first cover concave portion 224 opposite the first space portion 12. The sheet portion 11 includes a seat surface 11a and a seat surface 11b. FIG. 8 is a cross-sectional view taken along the line II-II in FIG. 7. The convex-forming portion 22 is composed of a first wall portion 221 and a first lid portion 222 that constitute the convex portion 21, a recessed portion 224 provided in the first lid portion, and a second convex portion 223 provided on a bottom surface 224' of the recessed portion. The first wall portion 221, the first lid portion 222, the recessed portion 224, and the second convex portion 223 each have a different resonance frequency, and the convex portion 21 (convex-forming portion 22) in which the first wall portion 221, the first lid portion 222, the recessed portion 224, and the second convex portion 223 are connected in series has a plurality of resonance frequencies as a whole. In addition, the dotted line B shown in FIG. 8 is a line that indicates the boundary between the sheet portion 11 and the convex portion 21. Also, in Figure 8, t1 is the thickness of the seat portion 11, t2 is the height of the first wall portion 221, t3 is the height of the first lid portion 222, t4 is the height of the recess 224, t5 is the height of the second convex portion 223, w1 is the cross-sectional width of the first space portion 12 in the planar direction of the seat portion, w2 is the width of the first wall portion 221, w3 is the cross-sectional width of the recess 224, w4 is the diameter of the recess 224, and w5 is the diameter of the second convex portion 223. In this embodiment, except that the recess 224 is provided in the first cover portion 222 and the second protrusion 223 is provided in the recess 224, the configuration is the same as that of the resonant sheet member 100 of the first embodiment described above, so duplicate explanations will be omitted here. In this embodiment, the second convex portion of the first embodiment is replaced with a recess, and a nested structure is formed in which the second convex portion is provided inside the recess. Similarly, a nested structure in which the second convex portion of the second embodiment is replaced with a second recess and a second convex portion is provided inside the second recess is also conceivable. Furthermore, similarly, a structure in which N recesses from the first recess to the Nth recess, where N is any integer, are provided as a nested structure, and a second convex portion is provided inside the Nth recess is also conceivable.

[0066] The second convex portion 223 may have a second space portion 13 therein, and may further have a through-hole that directly connects the second space portion 13 and the first space portion 12 as shown in FIG. 8. From the viewpoint of lowering the resonance frequency, this embodiment is preferable. In FIG. 8, w6 indicates the cross-sectional width of the second convex portion 223.

[0067] Examples of the resonator sheet member 101 are shown in FIGS. 9(a) to 9(d). The resonator sheet member 101 shown in FIG. 9(a) is configured such that both the sheet portion 11 and the protrusion 21 have the first space portion 12, similar to the resonator sheet member 101 shown in FIG. The resonator sheet member 101 shown in FIG. 9(b) has a configuration in which only the protrusion 21 has the first space 12. 9(c) shows a resonant sheet member 101 in which both the sheet portion 11 and the protruding portion 21 have first spaces 12, and the first spaces 12 are provided so as to penetrate from the surface of the sheet portion 11 opposite to the side on which the protruding portion 21 is provided to the first spaces 12 of the protruding portion 21. From the viewpoint of achieving both ease of molding and sound insulation performance, this embodiment is preferable. The resonant sheet member 101 shown in Figure 9(d) has a configuration similar to that of the resonant sheet member 101 in Figure 9(c) above, and is configured such that the cross-sectional width w2-2 of the first space portion 12s of the sheet portion in the planar direction of the sheet portion is smaller than the cross-sectional width w2-1 of the first space portion 12r of the convex portion in the planar direction of the sheet portion. Furthermore, when the second convex portion has a second space, the second convex portion may not have a through-hole connecting the second space to the outside. This through-hole directly connects the convex portion to the outside, and does not include a through-hole connecting the first space of the convex portion to the outside via a sheet portion, as shown in Figure 9(c). From the viewpoint of improving sound insulation performance, this embodiment is preferable.

[0068] As shown in Fig. 11, the resonance frequency can be lowered by providing weight portion 23 on the second convex portion. This embodiment is preferable for achieving vibration damping and sound insulation effects in the low frequency band.

[0069] [Convex] The protrusions 21 are provided on the sheet portion 11 and function as oscillators (resonators) that vibrate at a certain frequency when sound waves are incident from a noise source. The protrusions 21 function as resonators, providing vibration control and sound insulation at the resonant frequency. The protrusions 21 have a first space 12. For example, as in the resonant sheet member 101 shown in FIG. 8 , the protrusions 21 may be composed of a first space 12 extending from the sheet portion 11 and a protruding portion 22 surrounding the first space 12. The protrusions 21 effectively function as a resonator, with the leading end portion of the protruding portion 22, particularly the first cover portion 222 and the second protruding portion 223, functioning as a weight, and the rear end portion of the protruding portion 22, particularly the first wall portion 221, functioning as a spring. Furthermore, the protrusions 21 also effectively function as a resonator, with the second protruding portion 223 functioning as a weight and the recessed portion 224 functioning as a spring. Furthermore, the convex portion 21 effectively functions as a resonator, with the second convex portion 223 of the convex-forming portion 22 acting as a weight and the second convex portion 223 acting as a spring. These resonator functions may function independently or as a combined resonator of multiple portions constituting the convex-forming portion 22, depending on the values ​​of dimensional parameters that determine the design of the first wall portion 221, the first lid portion 222, the recess 224, and the second convex portion 223 that constitute the convex-forming portion 22. By appropriately designing the values ​​of dimensional parameters that determine the design of the first wall portion 221, the first lid portion 222, the recess 224, and the second convex portion 223 that constitute the convex-forming portion 22, it is possible to adjust multiple resonant frequencies. Unless otherwise specified, each parameter of the convex portion 21 described below represents the average value of the parameters of multiple convex portions. The tip side portion of the convex portion 21 (convex forming portion 22) may specifically be a region closer to the tip side than the sheet side end of the first space portion, or may also be a region including the first lid portion, the recess, and the second convex portion, but is preferably defined as the latter from the viewpoint of ensuring that the effects of the present invention are obtained. Furthermore, the tip side portion of the second convex portion 223 may specifically be a region closer to the tip side than the sheet side end of the second space portion when the second space portion is provided in the second convex portion. The protrusions 21 may be provided on at least one surface of the sheet portion 11, and may be provided on only one surface or on both surfaces, but from the viewpoint of improving sound insulation performance, it is preferable that the protrusions 21 be provided on both surfaces. However, when a support body, which will be described later, is provided to form a structure, from the viewpoint of ease of manufacture and stabilization of performance, it is preferable that the protrusions 21 be provided on only one surface of the sheet portion 11. In addition, when multiple protrusions are provided on both sides of the sheet, the parameters related to the protrusions in this specification are treated as parameters of the multiple protrusions provided on one side unless otherwise specified. For example, the conditions for the height of the protrusions described below apply to the parameters (specifically, their average values) of the multiple protrusions provided on one side of the sheet. Furthermore, the parameters of the resonant sheet member in this embodiment are treated as parameters of the entire resonant sheet, including all of the protrusions on both sides of the sheet.

[0070] [First space] The first space portion 12 may be provided so as to form at least the first wall portion 221, the first lid portion 222, and the recess portion 224 in the convex portion 21, but in order to obtain good sound insulation performance, it is preferable that it be provided in both the convex portion 21 and the area in which the convex portion 21 is provided in the sheet portion 11, and it is particularly preferable that one first space portion 12 be provided that is connected across both the convex portion 21 and the area in which the convex portion 21 is provided in the sheet portion 11.

[0071] 9(c), there is an advantage that manufacturing is easy because the cross-sectional area of ​​the first space 12 in the planar direction of the seat portion does not have a portion where the cross-sectional area of ​​the first space 12 increases from the surface of the seat portion 11 opposite the side where the convex portion 21 is provided toward the tip side of the convex portion 21. Since there is no portion where the cross-sectional area increases in this way, a manufacturing method can be used that uses a mold 61a with a recess and a mold 61b with a protrusion as shown in FIG. 16, which will be described later.

[0072] Recess The protrusion 21 has a recess 224. The recess 224 has a second protrusion 223 on its surface 224'. By having the recess 224, the protrusion 21 has a degree of freedom of elastic vibration of the recess 224 in addition to the degree of freedom of elastic vibration of the first wall 221 and the first cover 222. In particular, the stretching vibration of the recess 224 in a direction perpendicular to the resonating sheet surface is included in the natural vibration mode of the protrusion 21, thereby achieving a vibration damping effect and sound insulation effect in a direction perpendicular to the resonating sheet surface. The mechanism by which the stretching vibration of the recess 224 in a direction perpendicular to the resonating sheet surface achieves the vibration damping and sound insulation effect is not clear, but it is thought that this is because the vibration of the recess 224 and the second protrusion 223 is excited in the opposite phase to the vibration of the first wall 221 and the first cover 222, which vibrate together with the sheet 11 excited by the input vibration or input sound wave, thereby suppressing the vibration of the first cover 222, the first wall 221, and the sheet 11.

[0073] The height t4 of the recess 224 of the protrusion 21 is not particularly limited and can be set as appropriate. The cross-sectional width w3 of the recess 224 is also not particularly limited and can be set as appropriate. By appropriately setting these, it is possible to design a frequency at which sound insulation and vibration damping performance in a direction perpendicular to the horizontal plane of the sheet portion due to vibration modes originating from the recess can be achieved. Increasing the height t4 of the recess 224, increasing the cross-sectional width w3, or both, can increase the resonant frequency due to vibration of the recess 224. However, this does not necessarily apply to the effect of the height t4 and width w3 of the recess 224 on the resonant frequency due to vibration of other components constituting the protrusion-forming portion 22. For example, in vibration modes due to vibration of only the first wall portion 221, the recess 224 acts as a weight. Therefore, increasing the height t4 of the recess 224, increasing the width w3, or both, is equivalent to increasing the weight of the weight, thereby lowering the resonant frequency. From the viewpoints of ease of molding, productivity, and improved sound insulation performance, the maximum height of the recess 224 is preferably 50 mm or less, more preferably 40 mm or less, and even more preferably 30 mm or less. The minimum height of the recess 224 is preferably 100 μm or more, more preferably 500 μm or more, and even more preferably 1 mm or more. The maximum value of the width w3 of the recess 224 is preferably 20 mm or less, more preferably 10 mm or less, and even more preferably 5 mm or less. The minimum value of the width w3 of the recess 224 is preferably 10 μm or more, more preferably 100 μm or more, and even more preferably 1 mm or more.

[0074] 7, when the outer shape of the recesses 224 is cylindrical, the diameter of the cross section of the recesses 224 included in a plane parallel to the seat surface 11a of the seat portion 11 at the height position where the sum of the cross-sectional areas of the recesses is greatest is preferably 95 mm or less, more preferably 45 mm or less, and even more preferably 25 mm or less. Furthermore, the diameter of the cross section of the recesses 224 included in the plane is preferably 10 μm or more, more preferably 100 μm or more, and even more preferably 1 mm or more. By setting the cross-sectional area of ​​the recesses 224 and the diameter of the circle in the case of a cylinder within the above-mentioned preferred ranges, better sound insulation performance can be obtained, and ease of molding and productivity also tend to be further improved.

[0075] The cross-sectional shape of the recess 224 is not particularly limited, and any shape can be adopted, such as a triangular prism, a rectangular prism, a trapezoidal prism, a polygonal prism such as a pentagonal prism or a hexagonal prism, a cylindrical prism, an elliptical prism, a truncated pyramid, a truncated cone, a pyramid, a cone, a cylinder, or an irregular shape not classified as any of the above. From the viewpoint of productivity, a rectangular prism or a cylindrical shape is preferable. The shape can be appropriately selected depending on the application from the viewpoints of sound insulation performance, manufacturing cost, handleability, etc.

[0076] [Second convex part] The convex portion 21 has a second convex portion 223. By having the second convex portion, the convex portion 21 has a degree of freedom of elastic vibration of the second convex portion 223 in addition to the degree of freedom of elastic vibration of the first wall portion 221, the first lid portion 222, and the recessed portion 224. In particular, since the stretching vibration of the second convex portion 223 in a direction perpendicular to the resonating sheet surface is included in the natural vibration mode of the convex portion 21, a vibration damping effect and a sound insulating effect can be obtained in the direction perpendicular to the resonating sheet surface. Although the mechanism by which the vibration damping and sound insulating effect are obtained by the stretching vibration of the second convex portion 223 in the direction perpendicular to the resonating sheet surface is not clear, it is thought that this is because the stretching vibration of the second convex portion 223 is excited in the opposite phase to the first wall portion 221, the first lid portion 222, and the recessed portion 224, which vibrate together with the sheet portion 11 excited by the input vibration or input sound wave, thereby suppressing the vibration of the first lid portion 222, the first wall portion 221, the recessed portion 224, and the sheet portion 11.

[0077] The height t5 of the second convex portions 223 is not particularly limited and can be set appropriately. This allows for designing a frequency at which sound insulation and vibration damping performance in a direction perpendicular to the horizontal plane of the sheet portion due to a vibration mode originating from the second convex portions is exhibited. Increasing the dimension of the height t5 of the second convex portions 223 makes it possible to lower the resonance frequency caused by the vibration of the second convex portions 223. From the viewpoints of ease of molding, productivity, and improved sound insulation performance, the maximum height of the second convex portions 223 is preferably 50 mm or less, more preferably 40 mm or less, and even more preferably 30 mm or less. Furthermore, the minimum height of the second convex portions 223 is preferably 100 μm or more, more preferably 500 μm or more, and even more preferably 1 mm or more.

[0078] The second convex portion 223 may have a second space 13 therein, or the interior may be filled with the material of the convex-forming portion described below. However, having a second space 13 is preferable because it can reduce the elastic modulus of the second convex portion 223 and lower the natural frequency of the stretching vibration mode. The second space 13 may have a through hole. The through hole may be located on the tip side of the second convex portion 223, thereby connecting the second space 13 to the outside, as shown in FIG. 10( a), or on the side of the recess 224 where the second convex portion 223 is provided, thereby connecting the second space 13 to the first space 13, as shown in FIG. 10( b), or may be located elsewhere, as shown in FIG. 10( c). The second space 13 desirably has a through hole because the apparent elastic modulus, which determines the natural frequency of the second convex portion 223, is reduced, thereby lowering the resonant frequency due to the second convex portion 223. 10(d), the second space 13 may have through holes formed in a plurality of locations, or may be formed so that the second space 13 connects the first space 12 to the outside. By connecting the first space 12 and the second space 13 to the outside in this manner, the elastic modulus of the convex portion 21 caused by the air in the space of the convex portion 21 can be reduced, and the resonance frequency can be lowered. Therefore, it is preferable to form through holes so that the second space 13 connects the first space 12 to the outside.

[0079] 10(a), (b), and (d), the cross-sectional area of ​​the second space 13 in the plane direction of the seat portion is constant or approximately constant, or there is no portion where the cross-sectional area of ​​the second space 13 increases from the surface of the face of the recess 224 on which the first space 12 and the second space 13 are provided to the second space 13. Since there is no portion where the cross-sectional area increases in this way, a manufacturing method using a mold 61a with a recess and a mold 61b with a protrusion as shown in FIG. 16, which will be described later, can be used.

[0080] 10(a), (b), and (d), the cross-sectional area of ​​the cross section in the sheet portion plane direction of space portion 14 surrounded by second convex portion 223, concave portion 224, and first lid portion 222 is constant or approximately constant, or there is no portion where the cross-sectional area of ​​space portion 14 increases from the surface of first lid portion 222 opposite to the surface where first space portion 12 is provided to space portion 14, which has the advantage of making manufacturing easier. Since there is no portion where the cross-sectional area increases in this way, a manufacturing method using a mold 61a with a recess and a mold 61b with a protrusion can be used as shown in FIG. 16, which will be described later.

[0081] When the second convex portion 223 has a second spatial portion, the width w6 of the cross section of the second convex portion is not particularly limited and can be set appropriately. This allows for designing a frequency at which sound insulation and vibration damping performance in a direction perpendicular to the horizontal plane of the seat portion due to a vibration mode originating from the second convex portion is exhibited. Increasing the width w6 of the second convex portion 223 increases the resonant frequency caused by the vibration of the second convex portion 223. When the second convex portion 223 has a second spatial portion 13, the maximum cross-sectional width w6 of the second convex portion in a cross section including the second spatial portion 13 in a plane parallel to the seat surface 11a is preferably 20 mm or less, more preferably 10 mm or less, and even more preferably 5 mm or less. Furthermore, the minimum cross-sectional width w6 of the second convex portion in a cross section including the second spatial portion 13 is preferably 10 μm or more, more preferably 100 μm or more, and even more preferably 1 mm or more. By setting the cross-sectional width w6 of the second convex portion in the cross section including the second space portion 13 within the above-mentioned preferred range, ease of molding, productivity, and sound insulation performance tend to be improved.

[0082] 7, when the second protrusions 223 are cylindrical, the cross-sectional diameter of the second protrusions 223 included in a plane parallel to the seat surface 11a of the seat portion 11 at a height position where the sum of the cross-sectional areas of the second protrusions is greatest is preferably 90 mm or less, more preferably 40 mm or less, and even more preferably 20 mm or less. The cross-sectional diameter of the second protrusions 223 included in the plane is preferably 10 μm or more, more preferably 100 μm or more, and even more preferably 1 mm or more. By setting the cross-sectional area of ​​the second protrusions 223 and the diameter of the circle in the case of a cylinder within the above-mentioned preferred ranges, better sound insulation performance can be obtained, and ease of molding and productivity also tend to be further improved.

[0083] When the second convex portion 223 has a second spatial portion 13, in a plane parallel to the seat surface 11a, among the cross sections of the second convex portion 223 included in the outer surface, the maximum value of the cross-sectional width w4 of the second convex portion in the cross section including the second spatial portion 13 is preferably 20 mm or less, more preferably 10 mm or less, and even more preferably 5 mm or less. Furthermore, the minimum value of the cross-sectional width w4 of the second convex portion in the cross section including the second spatial portion 13 is preferably 10 μm or more, more preferably 100 μm or more, and even more preferably 1 mm or more. By setting the cross-sectional width w4 of the second convex portion in the cross section including the second spatial portion 13 within the above-mentioned preferred numerical range, ease of molding, productivity, and sound insulation performance tend to be improved.

[0084] As shown in Fig. 11 , the second convex portion 223 may have a weight 23 at its tip. Providing the weight 23 on the second convex portion 223 is preferable because the weight 23 increases the vibration moment of the second convex portion 223 and can lower the natural frequency of the stretching vibration of the second convex portion. Furthermore, providing the weight 23 on the second convex portion 223 also has the effect of increasing the vibration moment of the recess 224, the first cover portion 222, and the first wall portion 221 because the second convex portion 223 is connected to the recess 224, the first cover portion 222, and the first wall portion 221. Therefore, providing the weight 23 on the second convex portion 223 is preferable because it can lower the natural frequencies of the natural vibration mode related to the vibration of the recess 224, the natural vibration mode related to the vibration of the first cover portion 222, and the natural vibration mode related to the vibration of the first wall portion 221. Furthermore, even in an embodiment in which the second convex portion 223 has a weight portion 23 at the tip, similarly to an embodiment in which the second convex portion 223 does not have a weight portion 23, it is preferable that the second convex portion 223 has a second space portion 13, since this can lower the natural frequency. In addition, it is preferable that the second space portion 13 has a through hole, since this can further lower the natural frequency. Furthermore, it is preferable that the second space portion 13 has multiple through holes, thereby connecting the first space portion 12 and the outside via the second space portion 13, since this can further lower the natural frequency. It should be noted that weight portion 23 may be completely embedded in convex forming portion 22 (convex portion 21), or at least a portion thereof may be embedded, or may be provided on convex forming portion 22 without being embedded in convex forming portion 22. From the viewpoint of preventing the weight portion from falling off, it is preferable that at least a portion of weight portion 23 is embedded in convex forming portion 22 (convex portion 21), and it is more preferable that weight portion 23 is completely embedded.

[0085] The cross-sectional shape of the second convex portion 223 is not particularly limited, and any shape can be adopted, such as a triangular prism, a rectangular prism, a trapezoidal prism, a polygonal prism such as a pentagonal prism or a hexagonal prism, a cylindrical prism, an elliptical prism, a truncated pyramid, a truncated cone, a pyramid, a cone, a cylinder, or an irregular shape not classified as any of the above. From the viewpoint of productivity, a rectangular prism or a cylindrical shape is preferable. The shape can be appropriately selected depending on the application from the viewpoints of sound insulation performance, manufacturing cost, handleability, etc.

[0086] [Convex forming part] A plurality of convex forming portions 22 are provided on the seat surface 11a of the seat portion 11 in contact with each other, and are provided around the first space portion 12 to form a convex shape. The dimensional parameters of the first wall portion 221, the first lid portion 222, the recessed portion 224 provided in the first lid portion, and the second convex portion 223 provided in the recessed portion that form the outer shape of the convex forming portion 22 are the same as the dimensional parameters that form the above-mentioned convex portion 21. By appropriately designing these parameter values, it is possible to adjust a plurality of resonant frequencies.

[0087] 12(a) and 12(b), in the resonator sheet member according to the second embodiment, a part of the first space 12 may be provided so as to reach at least one of the tip and side surface of the protrusion 21. This configuration is advantageous because it reduces the effect of the air inside on the resonance of the protrusion 21 compared to when air is sealed inside.

[0088] 12(c), the second space 13 may have through-holes on both the tip side and the sheet side of the convex portion 21. This embodiment is preferable in that it can reduce the elastic modulus and lower the frequency while maintaining the strength of the second convex portion 223.

[0089] [Weight] The resonator sheet member according to the second embodiment may include a weight 23. While the shape of the weight 23 is not particularly limited, a plate-like weight is preferable in terms of adjusting sound insulation performance and achieving a thinner design. Having a plate-like weight 23 allows the center of gravity of the weight 23 to be positioned farther from the surface 224' of the recess 224 than when the weight 23 is spherical or the like, which tends to increase the vibration moment of the second convex portion 223. For example, if the vibration moment of the second convex portion 223 is constant, a plate-like weight 23 can be made thinner than when the weight 23 is spherical or the like. On the other hand, if the height of the weight 23 is constant, a plate-like weight can achieve a larger vibration moment than when the weight 23 is spherical or the like. Other details regarding the weight 23 are as described in the first embodiment.

[0090] <Structure> A structure (also simply referred to as a "structure") according to another embodiment of the present invention is a structure including at least the resonant sheet member according to each of the above embodiments and a support body that supports the resonant sheet member. The above-described resonant sheet member can be installed appropriately depending on the environment in which sound insulation performance is desired. For example, the resonant sheet member may be installed directly on a device, structure, etc. An adhesive layer or the like may be provided between the resonant sheet member and the device, structure, etc. Alternatively, as in this embodiment, the resonant sheet member may be used together with a support to form a structure. Note that the support only needs to support the resonant sheet member when the above-described resonant sheet member is used to insulate sound, and does not need to support the resonant sheet member during manufacturing, storage, etc. An example of the structure is shown in Figures 13 and 14. Figure 13 shows a structure 200 including the resonant sheet member 100 according to the first embodiment and a support body 51 that supports the resonant sheet member 100, while Figure 14 shows a structure 201 including the resonant sheet member 101 according to the second embodiment and a support body 51 that supports the resonant sheet member 101.

[0091] [Support] The support is not particularly limited as long as it is provided on the resonator sheet member. However, from the viewpoints of ease of manufacturing and structural stability, it is preferable that the support be provided in contact with the surface opposite to the surface on which the protrusions are provided in the resonator sheet member in which the protrusions are provided only on one side of the sheet member. Furthermore, when protrusions are provided on both sides of the sheet member, a support with holes may be used and provided on the sheet surface on which the protrusions are provided, as shown in FIG. 15(a). The support shown in FIG. 15(a) may also be provided on the side on which the protrusions are provided in a mode in which the protrusions are provided only on one side of the sheet member. Cross-sectional views of the resonator sheet member having the support shown in FIG. 15(a) are shown in FIGS. 15(b) and 15(c).

[0092] The material constituting the support is not particularly limited as long as it can support the resonating sheet member, but from the viewpoint of improving sound insulation performance, it is preferable that the material be more rigid than the material constituting the sheet portion and the protrusions. Specifically, the support 51 preferably has a Young's modulus of 1 GPa or more, more preferably 1.5 GPa or more, and although there is no particular upper limit, it can be, for example, 1000 GPa or less. Furthermore, when the resonant sheet member is installed directly on a device, structure, etc., it is preferable that the surface on which the resonant sheet member is installed has the same rigidity as the support body from the viewpoint of supporting the sheet and improving sound insulation performance.

[0093] Examples of materials constituting the support include a photocurable resin sheet, a thermosetting resin sheet, a thermoplastic resin sheet, a metal plate, an alloy plate, etc. Examples of the photocurable resin sheet, the thermosetting resin sheet, and the thermoplastic resin sheet include sheets using the photocurable resin, the thermosetting resin, and the thermoplastic resin listed in the sheet portion 11 above. Specific examples of materials that can be used to form the support include polyester resins such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, and polybutylene succinate; poly(meth)acrylate resins such as polymethyl methacrylate; polycarbonate resins such as polycarbonate made primarily from isosorbide; polyolefin resins such as polyethylene, polypropylene, and polynorbornene; organic materials such as vinyl chloride resin, polyacrylonitrile, polyvinylidene chloride, polyethersulfone, polyphenylene sulfide, polyarylate, polyamide, polyimide, triacetyl cellulose, polystyrene, epoxy resin, and oxazine resin; and composite materials containing metals such as aluminum, stainless steel, iron, copper, zinc, and brass, inorganic glass, inorganic particles, and fibers in these organic materials. Among these, the support is preferably at least one selected from the group consisting of a photocurable resin sheet, a thermosetting resin sheet, a thermoplastic resin sheet, a metal plate, and an alloy plate from the viewpoints of sound insulation, rigidity, formability, cost, etc. Here, the thickness of the support is not particularly limited, but is preferably generally 0.05 mm or more and 0.5 mm or less from the viewpoints of sound insulation, rigidity, formability, weight reduction, cost, etc. Furthermore, from the viewpoint of light transmittance, adhesion to the resonator sheet member, etc., the support may be provided with a coating layer on its surface.

[0094] The shape of the support can be appropriately set depending on the installation surface of the structure and is not particularly limited. For example, it may be a flat sheet, a curved sheet, or a special shape processed to have curved or bent portions. Furthermore, from the viewpoint of weight reduction, etc., cuts, punched portions, etc. may be provided at any location on the support.

[0095] The surface density of the support (mass per unit area) can also be set appropriately depending on the desired performance, and is not particularly limited. From the viewpoint of enhancing the effects of the present invention, the surface density of the support is preferably 80% or less of the surface density of the resonator sheet member, more preferably 30% or less, and even more preferably 10% or less. There is no particular upper limit, but it may be, for example, 1% or more.

[0096] The structure may be a laminate including the resonant sheet member of this embodiment. For example, resonant sheet members may be provided on both sides of a support. Alternatively, multiple structures each having a resonant sheet member provided on a support may be stacked. By combining multiple resonant sheet members, it is possible to control the frequency position, etc. Furthermore, even if the laminate has resonant sheet members on both sides of the support, if the support, the housing containing the laminate, etc. are flexible, it can conform to non-flat surfaces such as curved surfaces, so the structure can be attached stably.

[0097] <Method of manufacturing the resonant sheet member and structure> The method for producing the resonator sheet member and the structure of the present invention is not particularly limited, and examples thereof include the following production methods 1 to 4. The shape of the cavity used in each manufacturing method is not particularly limited, but for example, the shape of the bottom can be appropriately selected from hemispherical, flat, convex, concave, and the like. The resonator sheet members 100 and 101 are not particularly limited in terms of the material constituting the sheet portion and the protrusions, but from the viewpoints of productivity and economy, it is preferable that they contain at least one selected from the group consisting of thermosetting elastomers, photocurable elastomers, and thermoplastic elastomers. In the methods shown as manufacturing methods 3 and 4, the sheet portion and the protrusions may be independently made of different materials. In manufacturing methods 1 and 2, from the viewpoint of ease of molding, it is preferable that the material constituting the sheet portion and the protrusions is particularly selected from the group consisting of thermosetting elastomers and thermoplastic elastomers.

[0098] (Manufacturing method 1) The production method 1 may include the following steps (1) to (3). (1) A process in which a mold with multiple cavities is prepared and resin material is poured into the cavities. (2) The process of hardening the poured resin material. (3) A step of peeling the obtained cured product from the mold to obtain a resonator sheet member. Production method 1 may include, after step (2) or (3), a step of providing a support on the obtained cured product to obtain a structure.

[0099] (Manufacturing method 2) The production method 2 may include the following steps (4) to (7). (4) A step of preparing a mold having a plurality of cavities and placing weights in the plurality of cavities provided in the mold. (5) The process of pouring resin material into the cavity. (6) The process of hardening the poured resin material. (7) A step of peeling the obtained cured product from the mold to obtain a resonating sheet member. Production method 2 may include, after step (6) or (7), a step of providing a support on the obtained cured product to obtain a structure.

[0100] (Manufacturing method 3) The production method 3 may include the following steps (8) to (12). (8) A step of applying a photocurable elastomer precursor or a photocurable resin precursor to a mold having multiple cavities. (9) A step of laminating a substrate on the elastomer precursor or resin precursor that has been flattened on a mold. (10) A step of filling the cavity of the laminate of the support and the mold with the elastomer precursor or resin precursor from the substrate side using a pressure roll. (11) A process of curing the elastomer precursor or resin precursor onto which the cavity shape of the mold has been transferred by irradiating light from the substrate side, and polymerizing and bonding the cured product of the elastomer precursor or resin precursor to the substrate. (12) A step of peeling the bonded substrate and the cured product of the elastomer precursor or resin precursor from the mold to obtain a resonating sheet member and a structure.

[0101] (Manufacturing method 4) The production method 4 may include the following steps (13) to (15). (13) Rotating a roll mold having an outer circumferential surface on which a plurality of cavities are arranged, and running a substrate along the outer circumferential surface of the roll mold in the direction of rotation of the roll mold, while applying a photocurable elastomer precursor or a photocurable resin precursor to the outer circumferential surface of the roll mold; Filling the cavity with the elastomer precursor or resin precursor. (14) A step of irradiating the region between the outer circumferential surface of the roll mold and the substrate with light while the elastomer precursor or resin precursor is sandwiched between the outer circumferential surface of the roll mold and the substrate. (15) A step of peeling the bonded product of the cured elastomer precursor or resin precursor and the substrate obtained in the step (14) from the roll mold to obtain a resonant sheet member and a structure.

[0102] From the viewpoint of improving productivity and economy, a method of integrally molding the resonator sheet member by mold forming or cast molding is preferred. One example is a method of molding the sheet portion, protrusion, first space, and second space into an integrally molded product using a mold or cast having a cavity shaped to correspond to the integrally molded product. Such integral molding methods include various well-known methods such as press molding, compression molding, cast molding, extrusion molding, and injection molding, and the type is not particularly limited. Note that, if the raw material for each component is a resin material with rubber elasticity, it can be poured into the cavity in the form of a liquid precursor or a heated melt. Furthermore, if the raw material is a metal, alloy, or inorganic glass, it can be pre-positioned (inserted) in a predetermined position within the cavity to form an insert-molded product. The resin material is not particularly limited, and examples thereof include the materials exemplified for the sheet that is the resonator sheet member of the present invention, the convex forming portion, and the like, as well as their raw materials or intermediates.

[0103] FIG. 16 illustrates an example of a manufacturing process for a resonator sheet member. Here, molds 61a and 61b are used, each having a cavity 62 shaped to correspond to the convex and hollow portions described above (see FIG. 16(a)). A weight 23' is placed in the cavity 62 of the mold 61a (see FIG. 16(b)). A rubber-elastic resin material is then poured into the cavity 62, and after heating or pressurization as necessary (see FIG. 16(c)), the integrally molded sheet and convex portions are demolded to obtain the resonator sheet member (see FIG. 16(d)). While the resin material is poured after the weight 23' is placed in this example, the weight 23' may also be placed after the resin material is poured. The weight 23' can have the same structure as the weight portion 23 described above. This integral molding method not only improves productivity and economy, but also facilitates molding of complex shapes. Furthermore, it tends to facilitate the production of resonator sheet members with excellent mechanical strength due to the increased adhesion between components. From these viewpoints, the sheet portion or the protrusion, preferably the resonating sheet portion, is preferably an integrally molded product containing a thermosetting elastomer or a thermoplastic elastomer.

[0104] [Use of resonant sheet components and structures] One example of a possible use of the resonant sheet member and structure is to attach it to the inside or outside of small electronic devices to reduce or muffle motor noise, switching noise in electronic circuits, and the like. [Example]

[0105] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to these examples. Various conditions can be adopted in the present invention as long as they do not deviate from the gist of the present invention and the object of the present invention is achieved.

[0106] <Experiment 1> [Calculation of natural frequency] In the examples described below, the natural frequencies of the structures were calculated using COMSOL Multiphysics (COMSOL), a physical simulation software using the finite element method. The conditions for the physical simulation will be described in detail below. The physical simulation was performed using the finite element method. The finite element method is a numerical analysis technique for approximately solving differential equations that cannot be solved analytically with high accuracy. It divides a complex object to be analyzed into simple sub-elements and approximately calculates the overall behavior. The natural frequencies of the protrusions in the examples described below were calculated using the following procedure. For each of the portions i to vi of the structure shown in Figures 17 to 20, the physical properties (storage modulus (Young's modulus), Poisson's ratio, and density) listed in Table 1 and the material dimensions (a, h, and r) listed in Table 2 were substituted into the equations of the solid mechanics module in COMSOL Multiphysics (COMSOL, Inc.), and the natural vibration modes were calculated with the bottom surface of the sheet portion ii completely fixed. Of the natural vibration modes obtained as a result of the calculation, the frequencies of the natural vibration modes that have vibration damping and sound insulation effects in the direction perpendicular to the bottom surface of the sheet portion ii were evaluated, starting from the lowest frequency, as the first and second resonant frequencies for the first embodiment and the first, second, and third resonant frequencies for the second embodiment. 17 to 20 show an embodiment in which a perforated nut (hexagonal plate) is used as the weight. In this calculation, we assume an ideal state in which there is no influence from the adhesive, so we calculated the natural frequency under the condition that the bottom surface of part ii is completely fixed.

[0107] <First embodiment using a slotted nut (hexagonal plate) as the weight portion> [Comparative Example 1, Comparative Example 2-1, Example 1-1] Comparative Example 1 is a unit cell including a resonating sheet member as shown in FIG. 17, Comparative Example 2-1 is shown in FIG. 18, and Example 1-1 is shown in FIG. 19. The sizes of the constituent members of the unit cell are shown in Table 3. For component dimensions not listed in Table 3, the values ​​of Comparative Example 2 listed in Table 2 were used for Comparative Example 2-1, and the values ​​of Example 1 listed in Table 2 were used for Example 1-1. Furthermore, the same values ​​were set for the material properties of the rubber portion and the weight portion in all examples. The physical property values ​​and material allocation are shown in Table 1. The natural frequency of the longitudinal stretching vibration of the protrusions in the unit cell was calculated using the above calculation method, and the results are listed in Table 3.

[0108] [Comparative Example 2-2, Examples 1-2 and 1-3] Comparative Example 2-2 is a unit cell including a resonating sheet member shown in FIG. 18, and Examples 1-2 and 1-3 are shown in FIG. 19. The sizes of the constituent members of the unit cell are shown in Table 4. For component dimensions not listed in Table 4, the values ​​of Comparative Example 2 listed in Table 2 were used for Comparative Example 2-2, and the values ​​of Example 1 listed in Table 2 were used for Examples 1-2 and 1-3. Note that in Comparative Example 2-2 and Examples 1-2 and 1-3, as the cross-sectional width a1 of the first wall portion changes, the value of the radius ri of the first convex portion also changes accordingly. Furthermore, the same values ​​were set for the material properties of the rubber portion and the weight portion in all Examples. The physical properties and material allocation are shown in Table 1. The natural frequency of the longitudinal stretching vibration of the protrusion in the unit cell was calculated using the above calculation method, and the results are listed in Table 4.

[0109] Example 1-1 and Comparative Examples 1 and 2-1 have the same outer shape of the unit cell. Comparative Examples 1 and 2-1 differ in the presence or absence of a hollow region at the location of FIG. 18(b)-iv. Example 1 has a hollow region at the location of FIG. 19(b)-iv, similar to Comparative Example 2-1, as well as a second convex portion at the location of (b)-v. Comparative Example 1 only achieves the first resonant frequency, whereas Comparative Example 2-1 and Example 1-1 achieve both the first and second resonant frequencies. Furthermore, when comparing Comparative Example 2-1 and Example 1-1, despite the same convex outer dimensions, the first and second resonant frequencies are 254.6 Hz and 635.6 Hz for Example 1-1 and 328.5 Hz and 850.6 Hz for Comparative Example 2-1. This confirms that the second convex portion at the location of FIG. 19(b)-v lowers the frequency.

[0110] Comparative Example 2-2, Examples 1-2, and 1-3 were tested to confirm the first and second resonant frequencies when the dimension a1 in FIG. 18(b) and the dimensions a1 and a2 in FIG. 19(b) were changed, respectively. Table 4 shows the first and second resonant frequencies when each dimension parameter was changed. Table 4 and FIG. 21 also show the differences between the first and second resonant frequencies of Comparative Example 2-2 and Comparative Example 2-1, and the differences between the first and second resonant frequencies of Examples 1-2 and 1-3 and Example 1-1. In the structure of FIG. 18, the change in a1 resulted in approximately the same change in the first and second resonant frequencies. In contrast, in the structure of FIG. 19, the change in a2 had a relatively large effect on the first resonant frequency compared to the effect on the second resonant frequency, with the change being more than 10 times larger than the effect on the second resonant frequency. Similarly, the change in a1 resulted in a relatively large effect on the second resonant frequency compared to the effect on the first resonant frequency, with the change being more than 8 times larger than the effect on the first resonant frequency. In this way, it was confirmed that in the structure of FIG. 19, the first resonance frequency and the second resonance frequency can be designed independently by adjusting the dimensional parameters of a1 and a2.

[0111] <Aspect of the second embodiment using a perforated nut (hexagonal plate) as the weight portion> [Examples 2-1 to 2-7] Examples 2-1 to 2-7 are unit cells including the resonator sheet member shown in FIG. 20. Examples 2-1 to 2-7 differ from Examples 1-1 to 1-3 in the presence or absence of a recessed region in the portion vi of FIG. 20(b). In Examples 2-1 to 2-7, a second convex portion in the portion v of FIG. 20(b) is provided on the surface of the recessed region. Table 5 shows the sizes of the components of the unit cell. For component dimensions not listed in Table 5, the values ​​of Example 2 listed in Table 2 were used. Note that in Examples 2-1 to 2-7, as the cross-sectional width a1 of the first wall portion changes, the value of the radius ri of the first convex portion also changes by the same amount. Similarly, as the cross-sectional width a2 of the recess changes, the value of the radius ri of the first convex portion and the radius r1 of the recess also change by the same amount. Furthermore, the same values ​​were set for the material properties of the rubber portion and the weight portion in all Examples. The physical properties and material assignments are shown in Table 1. The natural frequency of the longitudinal stretching vibration of the protrusions in the unit cell was calculated based on the above calculation method, and the results are shown in Table 5.

[0112] The outer shape of the unit cell in Example 2-1 and Example 1-1 is the same. Instead of providing a second convex portion on the first lid portion in Example 1-1, in Example 2-1 a concave portion is provided on the first lid portion and a second convex portion is provided on the surface of the concave portion. As a result, in Example 2-1, the first resonance frequency and the second resonance frequency were 186.3 Hz and 454.5 Hz, respectively, and it was confirmed that both resonance frequencies were lower than those in Example 1-1.

[0113] Examples 2-2 to 2-5 were obtained by changing one of the dimensions a1, a2, a3, and h3 in FIG. 20 for Example 2-1. Table 7 shows the first, second, and third resonance frequencies when each dimension parameter was changed. Table 5 also lists the differences between the first, second, and third resonance frequencies of Examples 2-1 to 2-7 and those of Example 2-1. Comparing Examples 2-2 to 2-5, it was confirmed that, in the structure shown in FIG. 20, changing a3 had a relatively large effect on the second resonance frequency compared to the first and third resonance frequencies, with the former having a change of at least 10 times the amount of change. Similarly, it was confirmed that changing a2 had a relatively large effect on the second and third resonance frequencies compared to the first resonance frequency, with the former having a change of at least 10 times the amount of change. It was confirmed that, with respect to a1, an increase in a1 increased the first and second resonance frequencies, while the third resonance frequency decreased. It was confirmed that the first, second, and third resonance frequencies all changed in the same direction in response to changes in h3, but the amounts of change were different.

[0114] As described above, in the structure shown in FIG. 20, the first, second, and third resonant frequencies have different dependencies on the dimensional parameters, making it possible to adjust each resonant frequency by appropriately designing the dimensional values. In Examples 2-6 and 2-7, it was confirmed that a specific resonant frequency can be selectively adjusted by appropriately designing the dimensional parameters. In Example 2-6, it was confirmed that the change in the third resonant frequency was more than five times the change in the first and second resonant frequencies compared to Example 2-1. Furthermore, in Example 2-7, it was confirmed that the change in the first resonant frequency was more than four times the change in the first and second resonant frequencies compared to Example 2-1. The differences between the first, second, and third resonant frequencies of Examples 2-2, 2-6, and 2-7 and those of Example 2-1 are shown in FIG. 22.

[0115] [Table 1]

[0116] [Table 2]

[0117] [Table 3]

[0118] [Table 4]

[0119] [Table 5]

[0120] In Comparative Example 2-1 and Example 1-1, the height, diameter, and weight of the protrusions are the same, and the physical properties of these are also the same, and the comparison is made on the influence of whether or not the second convex portion is provided. Compared with Comparative Example 2-1, it was confirmed that Example 1-1 has lower frequencies for both the first and second resonant frequencies.

[0121] Next, to confirm the effect on the resonant frequency when the dimensions of each component constituting the protrusion were changed, Comparative Example 2-2, in which the dimension a1 in FIG. 18(b) was changed from the design of Comparative Example 2-1, was compared with Examples 1-2 and 1-3, in which the dimensions a1 and a2 in FIG. 19(b) were changed from the design of Example 1-1. As a result, the first and second resonant frequencies of Comparative Example 2-2 changed by 54.8 Hz and −31.8 Hz, respectively, compared to Comparative Example 2-1, resulting in significant changes in both the first and second resonant frequencies. Meanwhile, the first and second resonant frequencies of Example 1-2 changed by 1.6 Hz and 48.6 Hz, respectively, compared to Example 1-1, resulting in a change of more than 40 times the second resonant frequency relative to the change in the first resonant frequency. Furthermore, the first and second resonant frequencies of Example 1-3 changed by 29.6 Hz and −3.6 Hz, respectively, compared to Example 1-1, resulting in a change of more than 8 times the first resonant frequency relative to the change in the second resonant frequency. As described above, in the convex portion structure of Comparative Example 2 shown in FIG. 18, the absolute values ​​of the changes in the first resonant frequency and the second resonant frequency are approximately the same by changing the dimension a1, whereas in the convex portion structure of Example 1 shown in FIG. 19, it was confirmed that the first resonant frequency and the second resonant frequency can be adjusted independently by adjusting the dimensions a1 and a2.

[0122] In addition, in Examples 2-1 to 2-7, the changes in the first, second, and third resonant frequencies were confirmed when the dimensions a1, a2, a3, and h3 of the portions constituting the protrusions were changed for the protrusion structure shown in FIG. 20 . As a result, it was confirmed that by changing a3, the change in the second resonant frequency was changed by more than 10 times the absolute value of the changes in the first and third resonant frequencies, confirming that the second resonant frequency can be adjusted independently. In Example 2-6, it was confirmed that by simultaneously changing a3 and a2, the change in the third resonant frequency was changed by more than 5 times the absolute value of the changes in the first and second resonant frequencies, confirming that the third resonant frequency can be adjusted independently. Furthermore, in Example 2-7, it was confirmed that by simultaneously changing a3, a2, a1, and h3, the change in the first resonant frequency was changed by more than 4 times the absolute value of the changes in the second and third resonant frequencies, confirming that the first resonant frequency can be adjusted independently.

[0123] As described above, in the structures presented in Fig. 19 and Fig. 20 of the present invention, it has been confirmed that by appropriately adjusting the dimensions of the parts that make up the convex structure, it is possible to independently adjust multiple resonant frequencies, which is not possible with the convex structure of the comparative example shown in Fig. 18. As a result, when damping and insulating vibrations of multiple frequency bands of a vibrating body that is the target of vibration damping and sound insulation, the convex structure of the comparative example shown in Fig. 18 cannot independently adjust multiple resonant frequencies, so it is necessary to design and apply convex structures corresponding to at least the number of target frequency bands, but the convex structures presented in Fig. 19 and Fig. 20 of the present invention can independently adjust multiple resonant frequency bands, so by adopting convex structures in which multiple resonant frequencies are appropriately designed, it is possible to damp and insulating vibrations of multiple target frequency bands with fewer convex structures.

[0124] <Experiment 2> [Vibration response analysis calculation] In the examples described below, a vibration response analysis of a structure in which a resonant sheet member is mounted on a vibrating body was performed using COMSOL Multiphysics (COMSOL), a physical simulation software using the finite element method. The response in the frequency domain in the examples described below was calculated using the following procedure. For each of the portions 30 to 35 and 40 to 45 of the structures in Figures 23 to 26, the physical properties (storage modulus (Young's modulus), Poisson's ratio, density) listed in Table 6 and the dimensions (a, h, r, l, t) listed in Tables 7 to 13 were substituted into the equations of the solid mechanics module of COMSOL Multiphysics (COMSOL Inc.), and a load of 10 N / m was applied to the bottom surface 30b or 40b under the condition that the side surfaces of the vibrating bodies 30 and 40 were completely fixed. 2 The load was input and a frequency domain calculation was performed. The dimensions and areas of each of the sections 30-35 and 40-45 were assigned to the parameters shown in Figures 17, 19, 20, and 27. The velocity amplitude of the bottom surface 30b or 40b obtained as a result of the calculation was then evaluated. The natural frequency of the resonating sheet member used in this experiment was also evaluated using the same method as in Experiment 1.

[0125] <First embodiment using a slotted nut (hexagonal plate) as the weight portion> [Comparative Example 3-1, Example 3-1] Comparative Example 3-1 and Example 3-1 are structures in which the resonant sheet member shown in FIG. 23 and FIG. 24 are mounted on a vibrating body. The natural vibration modes and natural frequencies of the vibrating body constituting the vibrating body were calculated using the above calculation method, and the results are shown in Table 14 and FIG. 28. (a), (b), (c), and (d) in FIG. 28 are the first, second, third, and fourth natural modes, respectively. The protrusions 31 to 34 of Comparative Example 3-1 and Example 3-1 are designed so that their resonant frequencies match the natural frequency of the vibrating body, and are positioned at the antinodes of vibration of the natural mode whose natural frequency of the vibrating body matches the resonant frequency. The natural frequencies of the longitudinal extensional vibration of the protrusions in the unit cell of the resonant sheet member alone were calculated using the above calculation method, and the results are shown in Table 15. The protrusion 35 of Example 3-1 is designed so that its primary and secondary resonant frequencies match the primary and third natural frequencies of the vibrating body shown in Table 14, respectively. The natural frequency of the longitudinal stretching vibration of the protrusion in the unit cell of the resonating sheet member alone of the protrusion 35 was calculated based on the above calculation method, and the results are shown in Table 15. The results of the vibration response analysis of Comparative Example 3-1 and Example 3-1 are shown in FIG.

[0126] The only difference between Comparative Example 3-1 and Example 3-1 is that the former has protrusions 31 arranged therein, while the latter has protrusions 35 arranged in the same positions. The protrusions 31 and 35 have the same surface density, and the resonant frequency of the protrusions 31 and the first resonant frequency of the protrusions 35 are the same. Figure 29 , which shows the vibration response analysis results for Comparative Example 3-1 and Example 3-1, confirms that Comparative Example 3-1 and Example 3-1 exhibit equivalent vibration damping effects in the 190 Hz band, which is the resonant frequency common to these two protrusions. On the other hand, it was confirmed that Example 3-1 exhibits greater vibration damping effects than Comparative Example 3-1 in the 630 Hz band, which is the secondary resonant frequency of the protrusions 35. Therefore, by replacing single-degree-of-freedom protrusions such as the protrusions 31 with multiple-degree-of-freedom protrusions of the first embodiment such as the protrusions 35, it is expected that the vibration damping effect of the multiple-degree-of-freedom protrusions of the first embodiment at the secondary resonant frequency can be increased without increasing the surface density of the resonant sheet member, while maintaining the vibration damping performance of the single-degree-of-freedom protrusions.

[0127] <Aspect of the second embodiment using a perforated nut (hexagonal plate) as the weight portion> [Comparative Example 4-1, Example 4-1] Comparative Example 4-1 and Example 4-1 are structures in which the resonant sheet member shown in FIG. 25 and FIG. 26 are mounted on a vibrating body. The structure of vibrating body 40 constituting the structure is the same as that of vibrating body 30 in Comparative Example 3-1 and Example 3-1, and the natural vibration mode and natural frequency are consistent with Table 14 and FIG. 28. Protrusions 41, 42, 43, and 44 in Comparative Example 4-1 and Example 4-1 are designed so that their resonant frequencies match the natural frequency of the vibrating body, and are positioned at the antinodes of vibration of the natural mode whose natural frequency of the vibrating body matches the resonant frequency. Here, protrusions 42, 43, and 44 are designed the same as protrusions 32, 33, and 34 in Comparative Example 3-1 and Example 3-1. The natural frequency of the longitudinal stretching vibration of protrusion 41 in the unit cell of the resonant sheet member alone was calculated using the above calculation method, and the results are listed in Table 16. The protrusion 45 of Example 4-1 is designed so that the primary, secondary, and tertiary resonant frequencies respectively match the primary, tertiary, and quaternary natural frequencies of the vibrating body. The natural frequencies of the longitudinal extensional vibration of the protrusion in the unit cell of the resonating sheet member of the protrusion 45 were calculated using the above calculation method, and the results are shown in Table 16. The results of the vibration response analysis of Comparative Example 4-1 and Example 4-1 are shown in Figure 30.

[0128] The only difference between Comparative Example 4-1 and Example 4-1 is that the former has protrusions 41 arranged therein, while the latter has protrusions 45 arranged in the same positions. The protrusions 41 and 45 have the same surface density, and the resonance frequency of the protrusions 41 and the first resonance frequency of the protrusions 45 are the same. Figure 30 , which shows the vibration response analysis results for Comparative Example 4-1 and Example 4-1, confirms that Comparative Example 4-1 and Example 4-1 exhibit equivalent vibration damping effects in the 200 Hz band, which is the resonance frequency common to these two protrusions. Meanwhile, it was confirmed that Example 4-1 exhibited a greater vibration damping effect than Comparative Example 4-1 in the 650 Hz band, which is the secondary resonance frequency of the protrusions 45, and the 750 Hz band, which is the tertiary resonance frequency of the protrusions 45. Therefore, by replacing a single-degree-of-freedom protrusion such as protrusion 41 with a multiple-degree-of-freedom protrusion of the second embodiment such as protrusion 45, it is expected that the vibration-damping effect of the multiple-degree-of-freedom protrusion of the second embodiment at the secondary and tertiary resonant frequencies can be increased without increasing the surface density of the resonant sheet member, while maintaining the vibration-damping performance of the single-degree-of-freedom protrusion.

[0129] [Table 6]

[0130] [Table 7]

[0131] [Table 8]

[0132] [Table 9]

[0133] [Table 10]

[0134] [Table 11]

[0135] [Table 12]

[0136] [Table 13]

[0137] [Table 14]

[0138] [Table 15]

[0139] [Table 16]

[0140] The configurations and forms of the resonant sheet members and structures described and illustrated above are examples, and the present invention is not limited to the configurations and forms described and illustrated, but may have other appropriate configurations and forms. [Explanation of symbols]

[0141] 100, 101 Resonant sheet member, 11 Sheet portion, 12 First space portion, 13 Second space portion, 21 Convex portion, 22 Convex forming portion, 23 Weight portion

Claims

1. a sheet portion having rubber elasticity; at least one first convex portion having rubber elasticity and provided on at least one surface of the sheet portion, the first convex portion has a first space portion formed by a first wall portion and a first lid portion, The resonator sheet member has at least one second convex portion having rubber elasticity on a surface of the first cover portion facing the first space portion.

2. The resonant sheet member according to claim 1 , wherein the first convex portion is provided on only one surface of the sheet portion.

3. 2. The resonant sheet member according to claim 1, wherein the sheet portion has a space portion, and the space portion of the sheet portion is provided so as to penetrate from a surface of the sheet portion opposite to a surface on which the protrusion portion is provided to the space portion of the protrusion portion.

4. The resonator sheet member according to claim 1 , wherein the second convex portion has a second space portion.

5. The resonator sheet member according to claim 4 , wherein the second convex portion has a through hole connecting the second space portion to the outside.

6. The resonator sheet member according to claim 4 , wherein the second convex portion has a through hole connecting the first space portion and the second space portion.

7. The resonator sheet member according to claim 6 , wherein the through-hole of the second protrusion is provided at a tip end of the second protrusion.

8. The resonator sheet member according to claim 1 , wherein the second protrusion has a weight portion at its tip.

9. The resonator sheet member according to claim 8 , wherein at least a portion of the weight portion is embedded in the second convex portion.

10. The resonator sheet member according to claim 1 , further comprising an integrally molded product.

11. The resonator sheet member according to claim 1 , wherein the sheet portion and the protrusions contain at least one selected from the group consisting of a thermosetting elastomer, a photocurable elastomer, and a thermoplastic elastomer.

12. a sheet portion having rubber elasticity; the sheet portion has at least one first convex portion provided on at least one surface thereof, the first convex portion being composed of a first wall portion having rubber elasticity and a first lid portion; a first space formed by the first wall portion and the first lid portion; the first cover portion has a recessed portion that is convex toward the first space portion and has rubber elasticity, A resonant sheet member, wherein a second protrusion having rubber elasticity is provided on a surface of the first cover recess opposite to the first space portion.

13. The resonant sheet member according to claim 12, wherein the sheet portion has a space portion, and the space portion of the sheet portion is provided so as to penetrate from a surface of the sheet portion opposite to a side on which the protrusion portion is provided to the space portion of the protrusion portion.

14. The resonant sheet member according to claim 12 , wherein the second convex portion has a second space portion.

15. The resonator sheet member according to claim 14, wherein the second space reaches a surface of the recess on the side of the first space.

16. The resonator sheet member according to claim 14, wherein the second convex portion has a through-hole connecting the second space portion to the outside.

17. The resonator sheet member according to claim 16, wherein a through hole is provided at a tip of the second protrusion.

18. The resonator sheet member according to claim 12, wherein the second protrusion has a weight portion at a tip thereof.

19. The resonator sheet member according to claim 18 , wherein at least a portion of the weight portion is embedded in the second convex portion.

20. The resonant sheet member according to claim 12, further comprising a single-piece molding.

21. The resonator sheet member according to claim 12 , wherein the sheet portion and the protrusions contain at least one selected from the group consisting of a thermosetting elastomer, a photocurable elastomer, and a thermoplastic elastomer.

22. A structure comprising at least the resonant sheet member according to any one of claims 1 to 21, and a support member that supports the resonant sheet member.

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