Patent Publication Number: US-2021193101-A1

Title: Sound-blocking sheet member, sound-blocking structure using same, and method for manufacturing sound-blocking sheet member

Description:
This application is a Continuation Application based on International Application No. PCT/JP2019/034966, filed Sep. 5, 2019, which claims priority on Japanese Patent Application No. 2018-166867 filed on Sep. 6, 2018, and Japanese Patent Application No. 2019-148471 filed on Aug. 13, 2019, the contents of both of which are incorporated herein by reference. 
    
    
     TECHNICAL FIELD 
     The present invention relates to a sound-blocking sheet member, a sound-blocking structure using the same, and a method for manufacturing a sound-blocking sheet member. 
     BACKGROUND ART 
     In buildings such as complex housing, office buildings, and hotels, there is a demand for quietness suitable for room applications which is attained by blocking outdoor noise from automobiles, railroads, aircraft, ships, and the like, equipment noise generated inside buildings, or human voice. In addition, in vehicles such as automobiles, railroads, aircrafts, and ships, there is a demand for the reduction of indoor noise in order to provide quiet and cozy spaces to occupants by blocking wind noise or engine noise. Therefore, research and development of means for blocking the propagation of noise or vibration from outdoor places to indoor places or from the outside to the inside of vehicles, that is, vibration-damping and sound-blocking means has been underway. In recent years, in response to the verticalization or the like of buildings, there has been a demand for a lightweight vibration-damping and sound-blocking member, and, for vehicles as well, there has been a demand for a lightweight vibration-damping and sound-blocking member for improving energy efficiency. 
     Furthermore, in order to improve the degree of freedom in designing buildings, vehicles, and equipment thereof, there is a demand for a vibration-damping and sound-blocking member capable of dealing with complicated shapes. 
     Ordinarily, the characteristics of vibration-damping and sound-blocking materials follow the so-called a law of mass action. That is, the transmission loss, which is an index of the amount of noise reduction, is determined by the logarithm of the product of the mass of a vibration-damping and sound-blocking material and the frequency of an elastic wave or a sound wave. Therefore, in order to increase the amount of noise reduction at a certain frequency, it is necessary to increase the mass of the vibration-damping and sound-blocking material. However, methods for increasing the masses of vibration-damping and sound-blocking materials have limitations on the amount of noise reduction due to restrictions on the masses of buildings, vehicles, or the like. 
     In order to solve the problem with an increase in the masses of vibration-damping and sound-blocking members, the structures of the members have been thus far improved. For example, a method in which a plurality of stiff flat plate materials such as gypsum boards, concrete, steel plates, glass plates, or resin plates are combined and used, a method in which a hollow double-wall structure or a hollow triple-wall structure is produced using gypsum boards or the like, or the like is known. 
     In addition, recently, in order to realize sound-blocking performance overwhelming the law of mass action, a sound-blocking plate made of a plate-like acoustic metamaterial for which a high-stiffness flat plate material and a resonator are combined and used has been proposed. Specifically, sound-blocking plates having a plurality of independent stump-shaped protrusions (resonators) made of silicone rubber and tungsten or a plurality of independent stump-shaped protrusions (resonators) made of rubber provided on an aluminum substrate (refer to Non-Patent Documents 1 and 2), a sound-blocking plate having a plurality of independent stump-shaped protrusions (resonators) made of silicone rubber or silicone rubber and lead cap provided on an epoxy substrate (refer to Non-Patent Document 3) have been proposed. 
     In addition, a sound-blocking sheet member including a sheet having rubber elasticity and a resonance portion having a base portion and a weight portion has been proposed (Patent Document 1). 
     CITATION LIST 
     Patent Document 
     
         
         [Patent Document 1] 
         PCT International Publication No. WO 2017/135409 
         [Patent Document 2] 
         Japanese Unexamined Patent Application, First Publication No. 2000-265593 
       
    
     Non-Patent Document 
     
         
         [Non-Patent Document 1] 
         MB Assouar, M. Senesi, M. Oudich, M. Ruzzene and Z. Hou, Broadband plate-type acoustic metamaterial for low-frequency sound attenuation, Applied Physics Letters, 2012, volume 101, pp 173505. 
         [Non-Patent Document 2] 
         M. Oudich, B. Djafari-Rouhani, Y. Pennec, M. B. Assouar, and B. Bonello, Negative effective mass density of acoustic metamaterial plate decorated with low frequency resonant pillars, Journal of Applied Physics, 2014, volume 116, pp 184504. 
         [Non-Patent Document 3] 
         M. Oudich, Y. Li, M. B Assouar, and Z. Hou, A sonic band gap based on the locally resonant phononic plates with stubs, New Journal of Physics, 2010, volume 12, pp 083049. 
       
    
     SUMMARY OF INVENTION 
     Technical Problem 
     In Non-Patent Documents 1 to 3, studies have been made on shielding performance when the material or size of the stump-shaped protrusion (resonator) is changed. However, there were limitations on the degree of freedom in design for improving sound-blocking performance only by a change in the material or size of the stump-shaped protrusion (resonator). 
     In addition, in the sound-blocking plates described in Non-Patent Documents 1 to 3, since each resonator is installed on the substrate using an adhesive, the manufacturing steps are complicated, and the productivity and the economic efficiency are poor. Moreover, the sound-blocking plates described in Non-Patent Documents 1 to 3 are not easily deformed due to the use of the relatively rigid aluminum substrate or epoxy substrate and cannot be installed along, for example, a non-flat surface such as a curved surface. 
     In order to solve this, it is conceivable to adopt an aluminum substrate or epoxy substrate that has been molded to be curved in advance and install a plurality of resonators on the curved surface of the substrate. However, in such a case, since it is necessary to install individual resonators on the curved surface, the difficulty of the manufacturing steps further increases, and the productivity and the economic efficiency further deteriorate. In addition, the preparation of a substrate suitable for the curved shape of an installation place in each case lacks versatility. Hence, there has been a longing for a sound-blocking sheet member based on a new design concept in expanding industrial uses, particularly, from the viewpoint of the degree of freedom in design, versatility, productivity, cost, and the like. 
     The sound-blocking sheet member described in Patent Document 1 has a high degree of freedom in design and excellent versatility. However, there have been no sufficient studies in terms of the easiness of manufacturing, productivity, and durability. 
     In the case of a manufacturing method in which a weight portion is installed in a hole of a mold and a resin is poured as in Patent Document 1, there is a problem in that the resin does not easily reach a portion below the weight portion and an air bubble does not easily escape. Since the resin does not reach the portion below the weight portion, and an air bubble remains, there is a case where the surface on the front end side of the weight portion is not sufficiently covered with the resin. Since the weight portion is not covered with the resin, the weight portion is exposed, which leads to the dropping of the weight in some cases. 
     Patent Documents 1 and 2 disclose sound-blocking sheets having weights provided on the front end sides of the protrusions. Due to the provision of the weights, sound in low frequency bands, which is considered to be difficult to block, is blocked. 
     However, a method for manufacturing a sound-blocking sheet having such weights has not yet been sufficiently established. 
     For example, in a case where weight portions are provided on the front end sides of protrusions as in Patent Document 2, there is a concern that the weight may easily peel from the protrusion. 
     In addition, in the case of a step of, in a mold for molding a sound-blocking sheet, inserting a weight portion into a recessed portion in a mold for molding a protrusion and pouring a resin into the recessed portion as in Patent Document 1, there is a concern that the position of the weight portion may become uneven due to the flow of the resin. In a case where the position of the weight portion is significantly uneven, there is a high possibility that the sound-blocking performance may be affected, the weight portion that is unevenly positioned and consequently exposed may be released from the protrusion or rusted. 
     The present invention has been made in view of such background techniques. An object of the present invention is to provide a sound-blocking sheet member and a sound-blocking structure using the same that are relatively lightweight, have high sound-blocking performance overwhelming the law of mass action, and are excellent in terms of manufacturability and durability. 
     In addition, another object of the present invention is to provide a sound-blocking sheet member and a method for manufacturing the sound-blocking sheet member that is capable of suppressing the position of a weight portion becoming significantly uneven with respect to a protrusion. 
     It should be noted that the object of the present invention is not limited to the above-described objects, and it is also possible to regard the exhibition of an action and effect that is derived by each configuration described in embodiments for carrying out the invention described below, but cannot be obtained by conventional techniques as another object. 
     Solution to Problem 
     As a result of intensive studies to solve the above-described problems, the present inventors found that the above-described problems are solved by adopting a sheet member in which a specific resonance portion is provided on a sheet having rubber elasticity and completed the present invention. 
     In addition, as a result of intensive studies to solve the above-described problems, the present inventors found that the above-described problems are solved by pouring a resin into a plurality of cavities in which protrusion portions are to be molded and completed the present invention. In the cavity, the position of a weight portion in the surface direction of a sheet portion with respect to the bottom portion of the cavity is regulated by providing a projection portion at one of the bottom portion and the front end side of the weight portion, providing a recessed portion at the other, and inserting the projection portion into the recessed portion. 
     That is, the present invention provides a variety of specific aspects described below. 
     [1] A sound-blocking sheet member, including at least a sheet and a plurality of resonance portions, in which the resonance portions are provided in contact with a sheet surface of the sheet, each resonance portion includes a weight portion and a base portion, the weight portion is supported by the base portion and has a larger mass than the base portion, the weight portion has a penetration portion, and the base portion is in contact with a surface on a resonance portion front end side of the weight portion and covers the weight portion. 
     [2] The sound-blocking sheet member according to [ 1 ], in which an outer peripheral portion of the weight portion and the inside of the penetration portion are filled with the base portion. 
     [3] The sound-blocking sheet member according to [1] or [ 2 ], in which the weight portion is disposed on the front end side of the center in the height direction of the resonance portion. 
     [4] The sound-blocking sheet member according to any one of [1] to [3], in which the maximum height from the opposite surface of the sheet surface provided with the resonance portion to the front end of the resonance portion is 30 mm or less. 
     [5] The sound-blocking sheet member according to [4], in which the maximum height from the opposite surface of the sheet surface provided with the resonance portion to the front end of the resonance portion is 20 mm or less. 
     [6] The sound-blocking sheet member according to any one of [1] to [5], in which the resonance portion has a void in which the surface on the front end side of the resonance portion is indented, and the void is formed in the penetration portion. 
     [7] The sound-blocking sheet member according to any one of [1] to [6], in which the penetration portion is a through-hole. 
     [8] A sound-blocking structure, in which the sound-blocking sheet member according to any one of [1] to [7] is used. 
     [9] A sound-blocking sheet member, including at least a sheet and a plurality of resonance portions, in which the resonance portions are provided in contact with a sheet surface of the sheet, each resonance portion includes a weight portion and a base portion, the weight portion is supported by the base portion and has a larger mass than the base portion, and the weight portion has a penetration portion. 
     [10] The sound-blocking sheet member according to [9], in which an outer peripheral portion of the weight portion and the inside of the penetration portion are filled with the base portion. 
     [11] The sound-blocking sheet member according to [10], in which the maximum height from the opposite surface of the sheet surface provided with the resonance portion to the front end of the resonance portion is 30 mm or less. 
     [12] The sound-blocking sheet member according to [11], in which the maximum height from the opposite surface of the sheet surface provided with the resonance portion to the front end of the resonance portion is 20 mm or less. 
     [13] A sound-blocking structure, in which the sound-blocking sheet member according to any one of [9] to [12] is used. 
     [14] A method for manufacturing a sound-blocking sheet member having a sheet portion, a plurality of protrusion portions provided in the surface direction of the sheet portion, and weight portions each provided on front end sides of the plurality of protrusion portions, the method including 
     a weight portion insertion step of inserting the weight portions into bottom portions of a plurality of cavities, in which the protrusion portions are to be molded, in a mold including the plurality of cavities and 
     a resin insertion step of pouring a resin into the plurality of cavities, 
     in which a projection portion is provided at one of the bottom portion and the front end side of the weight portion, and a recessed portion or a penetration portion into which the projection portion is to be inserted is provided at the other, 
     in the weight portion insertion step, the projection portion is inserted into the recessed portion or the penetration portion, and 
     in the resin insertion step, in a state in which the projection portion is inserted into the recessed portion or the penetration portion and a position in the surface direction of the weight portion with respect to the bottom portion is regulated, the resin is poured into the cavities. 
     [15] The method for manufacturing a sound-blocking sheet member according to [14], in which the weight portion has the penetration portion. 
     [16] The method for manufacturing a sound-blocking sheet member according to [15], 
     in which the bottom portion is provided with the projection portion and a step portion that protrudes to a height lower than the projection portion and is in contact with a part of the surface on the front end side of the weight portion. 
     [17] The method for manufacturing a sound-blocking sheet member according to [16], 
     in which the step portion is provided in contact with the side surface of the projection portion. 
     [18] The method for manufacturing a sound-blocking sheet member according to [16], 
     in which the step portion is provided apart from the side surface of the projection portion. 
     [19] The method for manufacturing a sound-blocking sheet member according to [17] or [18], 
     in which the step portion inclines in a direction in which the height decreases as the protrusion portion runs from the central side in the radial direction toward the outer side in the radial direction, and 
     a maximum diameter of the step portion at a highest position is smaller than the hole diameter of the penetration portion provided in the weight portion, and a maximum diameter of the step portion at the lowest position is larger than the hole diameter of the penetration portion. 
     [20] The method for manufacturing a sound-blocking sheet member according to any one of [14] to [19], 
     in which the mold includes a lower mold having cavities provided in an open state on an upper surface, and 
     an upper mold that is movable between a position at which the upper mold comes into contact with the upper surface of the lower mold and a position at which the upper mold is spaced apart from the lower mold on an upper side and has an indentation provided on the upper surface and a penetration flow path that is open in the indentation, and 
     in the resin insertion step, in a state in which the upper mold and the lower mold are in contact with each other, a molten resin is poured into the cavities from the indentation through the penetration flow path. 
     [21] The method for manufacturing a sound-blocking sheet member according to [20], further including 
     a step of extruding a solid material of the resin disposed in the indentation with a press mold inserted into the indentation before the resin insertion step. 
     [22] The method for manufacturing a sound-blocking sheet member according to any one of [14] to [16], 
     in which the projection portion is provided at the bottom portion to incline in a direction in which the height decreases as the protrusion portion runs from the central side in the radial direction toward the outer side in the radial direction, and 
     a maximum diameter of the projection portion at a highest position is smaller than the hole diameter of the penetration portion provided in the weight portion, and a maximum diameter of the projection portion at the lowest position is larger than the hole diameter of the penetration portion. 
     [23] The method for manufacturing a sound-blocking sheet member according to any one of [14] to [22], further including 
     a step of moving the projection portion provided at the bottom portion to the bottom portion side before the resin poured into the cavities in the resin insertion step is solidified. 
     [24] The method for manufacturing a sound-blocking sheet member according to [23], further including 
     a step of, after solidification of the resin, moving the projection portion to the cavity side to release the sound-blocking sheet member from the mold. 
     [25] The method for manufacturing a sound-blocking sheet member according to any one of [14] to [24], 
     in which the maximum value of a gap between the projection portion and the recessed portion or between the projection portion and the penetration portion is smaller than the minimum value of a gap between the weight portion inserted into the cavity and the cavity. 
     [26] A sound-blocking sheet member including a sheet portion, 
     a plurality of protrusion portions provided in the surface direction of the sheet portion and having a resin material, and 
     weight portions each provided at insides on the front end side of the plurality of protrusion portions and each having a recessed portion or a penetration portion on the front end side, 
     in which a void is formed on the inner side of the end surface on the front end side of the weight portion. 
     [27] The sound-blocking sheet member according to [26], 
     in which the weight portion has the penetration portion, and 
     the inner side of the void in the penetration portion is filled with the resin material. 
     [28] The sound-blocking sheet member according to [27], 
     in which a portion between the surface of the penetration portion and the void is filled with the resin material. 
     [29] The sound-blocking sheet member according to [27], 
     in which the protrusion portion has a coating portion that covers a part of the surface on the front end side of the weight portion with the resin material, and 
     a penetration portion that is provided along a circumferential direction on the outer side in the radial direction of the void around the center in the radial direction of the protrusion portion as an axial line and exposes a part of the surface on the front end side of the weight portion to penetrate the coating portion. 
     [30] The sound-blocking sheet member according to [29], 
     in which the penetration portion has an inclination portion that inclines in a direction in which the inclination portion comes close to a surface of the coating portion as the protrusion portion runs from the central side in the radial direction toward the outer side in the radial direction, 
     a maximum diameter of the inclination portion at the innermost side is smaller than the hole diameter of the penetration portion, a maximum diameter of the inclination portion at an outermost surface side is larger than the hole diameter of the penetration portion, and 
     a part of the surface on the front end side of the weight portion is exposed in the middle of the inclination portion. 
     [31] The sound-blocking sheet member according to [27], 
     in which the protrusion portion has a coating portion that covers a part of the surface on the front end side of the weight portion with the resin material, and 
     an indented portion that is provided by removing a part of the coating portion and exposes a part of the surface on the front end side of the weight portion on a bottom surface, and 
     the void is open on the bottom surface of the indented portion. 
     [32] The sound-blocking sheet member according to [27], 
     in which the protrusion portion has a coating portion that covers a part of the surface on the front end side of the weight portion with the resin material, 
     the void has a penetration portion that is provided along a circumferential direction on the outer side in the radial direction of the void around the center in the radial direction of the protrusion portion as an axial line and exposes a part of the surface on the front end side of the weight portion to penetrate the coating portion, in which the penetration portion has an inclination portion that inclines in a direction in which the inclination portion comes close to a surface of the coating portion as the protrusion portion runs from the central side in the radial direction toward the outer side in the radial direction, a maximum diameter of the inclination portion at the innermost side is smaller than the hole diameter of the penetration portion, a maximum diameter of the inclination portion at an outermost surface side is larger than the hole diameter of the penetration portion, and a part of the surface on the front end side of the weight portion is exposed in the middle of the inclination portion. 
     Advantageous Effects of Invention 
     According to the present invention, it is possible to provide a sound-blocking sheet member and a sound-blocking structure using the same which are relatively lightweight, have high sound-blocking performance overwhelming the law of mass action, and are excellent in terms of manufacturability and durability. 
     In addition, in the present invention, it is possible to provide a sound-blocking sheet member capable of suppressing the position of a weight portion becoming significantly uneven with respect to a protrusion and a method for manufacturing the sound-blocking sheet member. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a schematic perspective view showing a sound-blocking sheet member and a sound-blocking structure according to a first embodiment. 
         FIG. 2A  is a schematic perspective view showing a resonance portion including a base portion  22  and a weight portion  23 . 
         FIG. 2B  is a schematic perspective view showing the weight portion  23 . 
         FIG. 3  is a cross-sectional view taken along a line II-II in  FIG. 1 . 
         FIG. 4  is a view showing an example of a manufacturing step of the sound-blocking sheet member. 
         FIG. 5  is a view showing an example of a manufacturing step of the sound-blocking sheet member. 
         FIG. 6  is a view showing an example of a manufacturing step of the sound-blocking sheet member. 
         FIG. 7  is a view showing an example of a manufacturing step of the sound-blocking sheet member. 
         FIG. 8  is a schematic perspective view showing a sound-blocking sheet member and a sound-blocking structure according to a second embodiment. 
         FIG. 9  is a view showing an example of a use of the sound-blocking structure. 
         FIG. 10A  is a schematic configuration view of a unit cell used for estimation of an acoustic bandgap. 
         FIG. 10B  is a schematic configuration view of the unit cell used for the estimation of the acoustic bandgap. 
         FIG. 11  is a schematic perspective view showing a structural example of a sound-blocking sheet member  100  and a sound-blocking structure  200  of a first embodiment according to the present invention. 
         FIG. 12  is a cross-sectional view taken along a line II-II in  FIG. 11 . 
         FIG. 13  is a perspective view of the appearance of the weight portion  23 , which is an embodiment according to the present invention. 
         FIG. 14  is a perspective view of the appearance of the resonance portion  21  in which the weight portion  23  is buried in the base portion  22 , which is an embodiment according to the present invention. 
         FIG. 15  is a partial cross-sectional view of the resonance portion  21  in which the weight portion  23  is buried in the base portion  22 , which is an embodiment according to the present invention. 
         FIG. 16  is a cross-sectional view of a mold MD, which is an embodiment according to the present invention. 
         FIG. 17  is a partial detailed view of a cavity CV, which is a space in which the resonance portion  21  is to be molded. 
         FIG. 18  is a view showing an order of manufacturing the sound-blocking sheet member  100 , which is an embodiment according to the present invention. 
         FIG. 19  is a view showing the order of manufacturing the sound-blocking sheet member  100 , which is an embodiment according to the present invention. 
         FIG. 20  is a view showing the order of manufacturing the sound-blocking sheet member  100 , which is an embodiment according to the present invention. 
         FIG. 21  is a partial cross-sectional view of the resonance portion  21  in which the weight portion  23  is buried in the base portion  22 , which is an embodiment according to the present invention. 
         FIG. 22  is a partial detailed view of the cavity CV, which is a space in which the resonance portion  21 , which is an embodiment according to the present invention, is to be molded. 
         FIG. 23  is a cross-sectional view of the mold MD, which is an embodiment according to the present invention. 
         FIG. 24  is a cross-sectional view of the mold MD, which is an embodiment according to the present invention. 
         FIG. 25  is a partial detailed view of the cavity CV, which is a space in which the resonance portion  21 , which is an embodiment according to the present invention, is to be molded. 
         FIG. 26  is a partial detailed view of the cavity CV, which is a space in which the resonance portion  21 , which is an embodiment according to the present invention, is to be molded. 
         FIG. 27  is a cross-sectional view of the mold MD, which is an embodiment according to the present invention. 
         FIG. 28  is a plan view of the resonance portion  21 , which is an embodiment according to the present invention. 
         FIG. 29  is a cross-sectional view taken along a line A-A in  FIG. 28 . 
         FIG. 30  is a partial detailed view of the cavity CV, which is a space in which the resonance portion  21 , which is an embodiment according to the present invention, is to be molded. 
         FIG. 31  is a plan view of the resonance portion  21 , which is an embodiment according to the present invention. 
         FIG. 32  is a cross-sectional view taken along a line B-B in  FIG. 31 . 
         FIG. 33  is a partial detailed view of the cavity CV, which is a space in which the resonance portion  21 , which is an embodiment according to the present invention, is to be molded. 
         FIG. 34  is a plan view of the resonance portion  21 , which is an embodiment according to the present invention. 
         FIG. 35  is a cross-sectional view taken along a line C-C in  FIG. 34 . 
         FIG. 36  is a partial detailed view of the cavity CV, which is a space in which the resonance portion  21 , which is an embodiment according to the present invention, is to be molded. 
         FIG. 37  is a partial detailed view of the cavity CV, which is a space in which the resonance portion  21 , which is an embodiment according to the present invention, is to be molded. 
         FIG. 38  is a partial detailed view of the cavity CV, which is a space in which the resonance portion  21 , which is an embodiment according to the present invention, is to be molded. 
         FIG. 39  is a plan view showing a modification example of a core portion  28 M shown in  FIG. 38 . 
         FIG. 40  is a partial detailed view of the cavity CV, which is a space in which the resonance portion  21 , which is an embodiment according to the present invention, is to be molded. 
         FIG. 41  is a plan view of the resonance portion  21 , which is an embodiment according to the present invention. 
         FIG. 42  is a partial cross-sectional view of the resonance portion  21  in which the weight portion  23  is buried in the base portion  22 , which is an embodiment according to the present invention. 
         FIG. 43  is a partial detailed view of the cavity CV, which is a space in which the resonance portion  21 , which is an embodiment according to the present invention, is to be molded. 
         FIG. 44  is a partial detailed view of the cavity CV, which is a space in which the resonance portion  21 , which is an embodiment according to the present invention, is to be molded. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     A sound-blocking sheet member of the present invention includes at least a sheet having rubber elasticity and a plurality of resonance portions. The resonance portions are provided in contact with a sheet surface of the sheet, the weight portion is supported by the base portion and has a larger mass than the base portion, and the weight portion has a penetration portion. 
     In the case of obtaining the sound-blocking sheet member of the present invention by disposing weights in a plurality of cavities provided in a mold, pouring a resin material or the like into the cavities, and then curing (solidifying) the resin material or the like, the weights each have a penetration portion at the time of pouring the resin material or the like into the cavities, whereby the cavities are also filled with the resin material or the like through the penetration portions. Therefore, the filling speed of the resin material or the like becomes fast, and, compared with a case where the weight is a cylinder, it is possible to improve the manufacturability. Furthermore, it is possible to let an air remaining in the lower portions of the cavities during filling out through the penetration portions and to sufficiently fill the cavities. Therefore, it is possible to suppress the molding defect of the resonance portion, and the manufacturing stability is excellent compared with a case where the weight is a cylinder. 
     When the sound-blocking sheet molded in the cavities is released, a force in a shear direction is applied to the resonance portions, and there is a possibility that the weight having a cylindrical shape or the like may drop from the resonance portion or the resonance portion may break from the weight portion. In addition, even when the sound-blocking sheet is used as a sound-blocking sheet, there is a possibility that the weight may drop or the resonance portion may break from the weight portion due to vibrations. On the other hand, in the weight having the penetration portion of the present invention, the penetration portion is also filled with the resin material or the like, this portion also acts as a fixation end to the resonance portion and tends to suppress drop or breakage. 
     Hereinafter, each embodiment of the present invention will be described with reference to the drawings. It should be noted that each embodiment described below is an example for describing the present invention, and the present invention is not limited only to the embodiment. In addition, in the following description, unless particularly otherwise specified, positional relationships such as up, down, right, and left shall be based on the positional relationships shown in the drawings. Moreover, the dimensional ratios in the drawings are not limited to the ratios shown in the drawings. It should be noted that, in the present specification, for example, the expression of a numerical range, for example, “1 to 100” is regarded as including both the lower limit value “1” and the upper limit value “100”. In addition, the above description is also true for other numerical ranges. 
     First Embodiment 
       FIG. 1  and  FIG. 3  are a schematic perspective view and a cross-sectional view taken along the line II-II which show a sound-blocking sheet member  100  and a sound-blocking structure  200  of the present embodiment. The sound-blocking sheet member  100  includes a sheet  11  having rubber elasticity, a plurality of resonance portions  21  provided in contact with a sheet surface  11   a  of the sheet  11 , and at least one rib-shaped protrusion portions  31  provided on the same sheet surface  11   a . The sound-blocking sheet member  100  is supported by a support  51  provided on the sheet surface  11   b  side of the sheet  11 , whereby the sound-blocking structure  200  is configured. 
     In the sound-blocking sheet member  100  and the sound-blocking structure  200 , for example, when a sound wave is incident from a noise source on the support  51  side, resonance occurs in the sheet  11  and/or the resonance portions  21 . At this time, the presence of a frequency range in which the direction of a force acting on the support  51  and the direction of acceleration that is generated in the sheet  11  and/or the resonance portions  21  become opposite to each other becomes possible, a part or all of vibrations at specific frequencies are cancelled, and thus a complete acoustic bandgap in which the vibrations at the specific frequencies almost completely disappear is generated. Therefore, in the vicinity of the resonance frequency of the sheet  11  and/or the resonance portions  21 , a part or all of vibrations come to rest, and as a result, high sound-blocking performance overwhelming the law of mass action can be obtained. A sound-blocking member that utilizes such a principle is referred to as an acoustic metamaterial. Hereinafter, each component of the sound-blocking sheet member  100  and the sound-blocking structure  200  of the present embodiment will be described in detail. 
     In the present invention, the maximum height from the opposite surface of the sheet surface provided with the resonance portions to the front end of the resonance portion is not particularly limited and may be appropriately adjusted depending on the application, but is preferably 30 mm or less. Furthermore, the maximum height from the opposite surface of the sheet surface provided with the resonance portions to the front end of the resonance portion is preferably 20 mm or less. The maximum height is more preferably 15 mm or less, still more preferably 10 mm or less, still more preferably 8 mm or less, far still more preferably 5 mm or less, and particularly preferably 3 mm or less. In addition, in a case where the sound-blocking sheet member  100  and the sound-blocking structure  200  are used in an application for blocking sound at high frequencies, the maximum height is preferably 1.0 mm or less. Within the above-described range, the sound-blocking sheet member  100  and the sound-blocking structure  200  have a sound-blocking function, it is possible to reduce the installation space necessary in the sound-blocking sheet member and to maintain the overall size of a small electronic device or the like as small as possible. 
     In addition, the lower limit is not particularly limited, but is, for example, 0.01 mm or more from the viewpoint of the easiness of manufacturing. It should be noted that the maximum height of the sound-blocking sheet member (hereinafter, referred to as the maximum height H in some cases) is the height indicated by H in  FIG. 1 , which shows the first embodiment, and represents the height from the sheet surface  11   b  of the sheet  11  to the maximum height of the resonance portion  21  in the normal direction to the sheet  11 . 
     [Sheet] 
     The sheet  11  is a sheet having rubber elasticity. The sheet  11  is not particularly limited and may a sheet having rubber elasticity attributed to the molecular motion or the like of a resin (organic polymer). The sheet  11  is also capable of functioning as a vibrator (resonator) that vibrates at a certain frequency when a sound wave is incident from a noise source. 
     The material that configures the sheet  11  preferably contains at least one selected from the group consisting of a thermoset or photocurable elastomer and a thermoplastic elastomer. 
     In the case of casting using a mold or the like, it is necessary to fill a cavity on the surface of the mold with an elastomer, and thus a photocurable elastomer is preferable since the photocurable elastomer is capable of filling the cavity in a liquid state with a relatively low viscosity before curing and is capable of increasing the filling rate. 
     Specific examples of the material that configures the sheet  11  include thermosetting resin-based elastomers such as a vulcanized thermosetting resin-based elastomer such as chemically crosslinked natural rubber or synthetic rubber, a urethane-based thermosetting resin-based elastomer, a silicone-based thermosetting resin-based elastomer, a fluorine-based thermosetting resin-based elastomer, and an acrylic thermosetting resin-based elastomer; 
     photocurable elastomers such as an acrylic photocurable elastomer, a silicone-based photocurable elastomer, and an epoxy-based photocurable elastomer; 
     thermoplastic elastomers such as an olefin-based thermoplastic elastomer, a styrene-based thermoplastic elastomer, a vinyl chloride-based thermoplastic elastomer, a urethane-based thermoplastic elastomer, an ester-based thermoplastic elastomer, an amide-based thermoplastic elastomer, a silicone-based thermoplastic elastomer, and an acrylic thermoplastic elastomer; and the like. 
     Additional specific examples of the thermoset or photocurable elastomer and the thermoplastic elastomer include rubber. Specific examples thereof include 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, modified bodies thereof, and the like, but are not particularly limited thereto. Among these elastomers, it is possible to use one kind of elastomer singly or two or more kinds of elastomers in combination. 
     Furthermore, 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 bodies thereof are preferable, and silicone rubber, acrylic rubber, and modified bodies thereof are more preferable. When these materials are used, there is a tendency that the sheet is excellent in terms of the heat resistance or the cold resistance. 
     The sheet  11  may contain a variety of additives such as a flame retardant, an antioxidant, a plasticizer, and a coloring agent as long as the sheet  11  is a sheet having so-called rubber elasticity. 
     The flame retardant is an additive that is blended to make flammable materials not easily burn or ignite. Specific examples thereof include 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 paraffin, antimony compounds such as antimony trioxide, metal hydroxides such as aluminum hydroxide, nitrogen compounds such as melamine cyanurate, boron compounds such as sodium borate, and the like, but are not particularly limited thereto. 
     In addition, the antioxidant is an additive that is blended to prevent oxidation degradation. Specific examples thereof include phenol-based antioxidants, sulfur-based antioxidants, phosphorus-based antioxidants, and the like, but are not limited thereto. 
     Furthermore, the plasticizer is an additive that is blended to improve flexibility and weather resistance. Specific examples thereof include phthalic acid esters, adipic acid esters, trimellitic acid esters, polyesters, phosphoric acid esters, citric acid esters, sebacic acid esters, azelaic acid esters, maleic acid esters, silicone oil, mineral oil, vegetable oil, modified bodies thereof, and the like, but are not particularly limited thereto. 
     Moreover, examples of the coloring agent include colorants, pigments, and the like. 
     Among these coloring agents, it is possible to use one kind of coloring agent singly or two or more kinds of coloring agents in combination. 
     In the present embodiment, the sheet  11  is formed in a square shape in a plan view, but the shape is not particularly limited thereto. It is possible to adopt any shape in a plan view such as a triangular shape, an oblong shape, a rectangular shape, a trapezoidal shape, a rhombus shape, a polygonal shape such as a pentagonal shape or a hexagonal shape, a circular shape, an elliptical shape, and indefinite shapes that are not classified into the above-described shapes. It should be noted that, from the viewpoint of the improvement of expansion and contraction performance, weight reduction, or the like, the sheet  11  may have a notched portion, a punched hole, or the like at any place as long as the sheet  11  does not lose the characteristics as an acoustic metainaterial. 
     The thickness of the sheet  11  is not particularly limited as long as the maximum height of the sound-blocking sheet member falls within the range of the present invention. Since it is possible to control a frequency band in which high sound-blocking performance is developed depending on the thickness of the sheet  11  (acoustic bandgap width or frequency position), it is possible to appropriately set the thickness of the sheet  11  such that the acoustic bandgap matches a desired sound-blocking frequency range. When thickness of the sheet  11  is thick, there is a tendency that the acoustic bandgap width becomes narrow and shifts toward the low frequency side. In addition, when the thickness of the sheet  11  is thin, there is a tendency that the acoustic bandgap width becomes wide and shifts toward the high frequency side. 
     From the viewpoint of sound-blocking performance, mechanical strength, flexibility, handleability, or the like, the thickness of the sheet  11  is preferably 10 μm or more, more preferably 50 μm or more, and still more preferably 100 μm or more. In addition, the thickness of the sheet  11  is preferably 2 mm or less, more preferably 1 mm or less, and still more preferably 500 μm or less. 
     From the viewpoint of sound-blocking performance, mechanical strength, flexibility, handleability, productivity, or the like, the sheet  11  has a Young&#39;s modulus of preferably 0.01 MPa or more and more preferably 0.1 MPa or more and has a Young&#39;s modulus of preferably 100 MPa or less and more preferably 10 MPa or less. 
     Here, the Young&#39;s modulus in the present specification means the ratio between a force (stress) acting per unit cross-sectional area and the deformation rate (strain) of a sample at the time of applying an external force in a uniaxial direction and means the value of the stored longitudinal elastic modulus at 25° C. and 10 Hz measured by the forced vibration non-resonant method of JIS K 6394: 2007 “Rubber, vulcanized or thermoplastic—Determination of dynamic properties”. 
     In addition, the sheet  11  preferably has a glass transition temperature of 0° C. or lower from the viewpoint of reducing the temperature dependence of the sound-blocking property at low temperatures. As the glass transition temperature of the sheet  11  lowers, the cold resistance is further enhanced, the temperature dependence of the elastic modulus near 0° C. becomes smaller, and there is a tendency that it becomes more difficult for the sound-blocking performance to depend on the ambient temperature. The glass transition temperature of the sheet  11  is more preferably −10° C. or lower, still more preferably −20° C. or lower, and particularly preferably −30° C. or lower. It should be noted that, in the present specification, the glass transition temperature of the sheet  11  means the peak temperature of the loss tangent in the above-described dynamic viscoelasticity measurement at a frequency of 10 Hz, particularly, the temperature dependence measurement. 
     [Resonance Portion] 
     The resonance portion  21  functions as a vibrator (resonator) that vibrates at a certain frequency when a sound wave is incident from a noise source. The resonance portion  21  of the present embodiment is formed of a composite structure including a base portion  22  and a weight portion  23  that is supported by the base portion  22  and has a larger mass than the base portion  22 . The resonance portion  21  effectively functions as a resonator having a resonance frequency that is determined by the mass of the weight portion  23  acting as a weight and the spring constant of the base portion  22  acting as a spring. 
     The array, number, size, and the like of the resonance portions  21  can be appropriately set depending on desired performance and are not particularly limited. The resonance portions  21  are provided in contact with at least one sheet surface of the sheet. For example, in the present embodiment, a plurality of the resonance portions  21  are disposed in a grid shape at equal intervals, but the array of the resonance portions  21  is not particularly limited thereto. For example, the plurality of resonance portions  21  may be disposed in, for example, a zigzag shape or may be randomly disposed. Since the sound-blocking mechanism by the present sheet does not utilize Bragg scattering, which is utilized in so-called phononic crystals, the intervals between the resonance portions  21  may not be regularly and periodically disposed at all times. 
     In addition, the number of the resonance portions  21  installed per unit area is not particularly limited as long as the resonance portions  21  can be disposed so as not to interfere with each other by coming into contact with each other or the like. 
     The maximum number of the resonance portions  21  per unit area varies depending on the shape or the like of the resonance portion  21 . For example, in a case where the resonance portion  21  has a cylindrical shape, the height direction of the cylinder is installed parallel to the sheet normal direction, and the cross-sectional diameter of the cylinder is 1 cm, the maximum number is preferably 100 or less per 10 cm 2 . 
     For example, in a case where the resonance portion  21  has a cylindrical shape, the height direction of the cylinder is installed parallel to the sheet normal direction, and the cross-sectional diameter is 1 cm, the minimum number of the resonance portions  21  per unit area is preferably 2 or more, more preferably 10 or more, and still more preferably 50 or more per 10 cm 2 . When the number of the resonance portions  21  installed is equal to or more than the above-described preferable lower limit, there is a tendency that higher sound-blocking performance can be obtained. In addition, when the number of the resonance portions  21  installed is equal to or less than the above-described preferable upper limit, it becomes easy to reduce the weight of the entire sheet. 
     The maximum height H 1  of the resonance portion  21  in the normal direction to the sheet  11  can be appropriately set depending on desired performance and is not particularly limited. From the viewpoint of the easiness of molding and the improvement of productivity, the maximum height H 1  is preferably 10 μm or more, more preferably 100 μm or more, and still more preferably 1 mm or more. In addition, the maximum height H 1  is preferably 20 mm or less, more preferably 15 mm or less, still more preferably 10 mm or less, still more preferably 8 mm or less, far still more preferably 5 mm or less, and particularly preferably 3 mm or less. When the maximum height H 1  is set within the above-described preferable numerical range, the sheet  11  provided with the resonance portions  21  (that is, the sound-blocking sheet member  100 ) is easily wound or laminated and can be manufactured by a so-called roll-to-roll method or stored in a roll shape, and there is a tendency that the productivity and the economic efficiency are enhanced. 
     In addition, the heights of all of the resonance portions  21  in the normal direction of the sheet  11  may not be the same and may be different. When the heights of the resonance portions are different, there is a case where an effect of expanding a frequency range in which sound-blocking performance appears can be obtained. 
     [Base Portion] 
     In the present embodiment, a plurality of base portions  22  having a substantially cylindrical outer shape are provided in contact with the sheet surface  11   a  of the sheet  11 , and the weight portions  23  are each buried inside the base portions  22 . The outer shape of the base portion  22  is not particularly limited, and it is possible to adopt an any shape such as a triangular columnar shape, a rectangular columnar shape, a trapezoidal columnar shape, a polygonal columnar shape such as a pentagonal column or a hexagonal column, a cylindrical columnar shape, an elliptical columnar shape, a truncated pyramid shape, a truncated cone shape, a prismatic shape, a conical shape, a hollow tubular shape, a branched shape, or an indefinite shape that is not classified into the above-described shapes. In addition, it is also possible to form the base portion  22  in a columnar shape having a cross-sectional area and/or cross-sectional shape that varies depending on the height position of the base portion  22 . 
     In addition, the shapes or heights of a plurality of the base portions provided in contact with the sheet surface  11   a  may be identical or different. 
     The material of the base portion  22  is not particularly limited as long as the above-described required characteristics are satisfied. Examples thereof include resin materials and include at least one selected from the group consisting of a thermoset or photocurable elastomer, a thermoplastic elastomer, a thermosetting or photocurable resin, and a thermoplastic resin. 
     Examples of the thermoset or photocurable elastomer and the thermoplastic elastomer include those exemplified in the section of the sheet. 
     Examples of the thermosetting or photocurable resin include acrylic thermosetting resins, urethane-based thermosetting resins, silicone-based thermosetting resins, epoxy-based thermosetting resins, and the like. Examples of the thermoplastic resin include polyolefin-based thermoplastic resins, polyester-based thermoplastic resins, acrylic thermoplastic resins, urethane-based thermoplastic resins, polycarbonate-based thermoplastic resins, and the like. 
     Specific examples thereof include rubbers such as 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 bodies thereof; polymers such as polyacrylonitrile, polyethylene terephthalate, polybutylene terephthalate, polyvinyl chloride, polychlorotrifluoroethylene, polyethylene, polypropylene, polynorbornene, polyether ether ketone, polyphenylene sulfide, polyarylate, polycarbonate, polystyrene, epoxy resins, and oxazine resins; and the like, but are not particularly limited thereto. Among these resin materials, it is possible to use one kind of resin material singly or two or more kinds of resin materials in combination. 
     In addition, the base portion  22  may be a porous body including pores (gas such as air) in the resin material. Furthermore, the base portion  22  may include a liquid material such as mineral oil, vegetable oil, or silicone oil. It should be noted that, in a case where the base portion  22  includes a liquid material, the liquid material is desirably contained in the resin material from the viewpoint of suppressing the outflow of the liquid material to the outside. 
     Among these, the material of the base portion  22  is preferably the same material as the sheet  11  and particularly preferably an elastomer. When the sheet  11  and the base portions  22  contain the same elastomer, the integral molding of the sheet  11  and the base portions  22  becomes easy, and the productivity is significantly enhanced. That is, one of particularly preferable aspects is an integrally molded product in which the sheet  11  and the resonance portions  21  (base portions  22 ) both contain at least one selected from the group consisting of a thermoset or photocurable elastomer and a thermoplastic elastomer. 
     Specific examples of the elastomer include vulcanized rubber such as chemically crosslinked natural rubber or synthetic rubber, isoprene rubber, butadiene rubber, styrene-butadiene rubber, chloroprene rubber, nitrite rubber, polyisobutylene rubber, ethylene-propylene rubber, chlorosulfonated polyethylene rubber, acrylic rubber, fluororubber, epichlorohydrin rubber, polyester rubber, urethane rubber, silicone rubber, and modified bodies thereof, polyacrylonitrile, polyethylene terephthalate, polybutylene terephthalate, polyvinyl chloride, polychlorotrifluoroethylene, polyethylene, polypropylene, polynorbornene, polyether ether ketone, polyphenylene sulfide, polyarylate, polycarbonate, polystyrene, epoxy resins, and oxazine resins, and the like, but are not particularly limited thereto. 
     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 bodies thereof are preferable, and silicone rubber, acrylic rubber, and modified bodies thereof are more preferable from the viewpoint of excellent heat resistance or cold resistance or the like. 
     It should be noted that it is also possible to produce the base portion  22  as a two-color molded product or a multi-color molded product made of two or more kinds of resin materials. In this case, when the same elastomer as the above-described sheet  11  is adopted for the base portions  22  on the side in contact with the sheet  11 , the integral molding of the sheet  11  and the base portions  22  becomes easy. 
     It should be noted that, in a case where the resonance portions  21  (base portions  22 ) having a circular cross-sectional shape are provided as in the present embodiment, in a cross section parallel to the sheet surface  11   a  of the sheet  11  at a height position of the resonance portion  21  (base portion  22 ) at which the total of the cross-sectional areas of the plurality of resonance portions  21  (base portions  22 ) is maximized, the diameter of the circle having the largest diameter among the circles (circular cross sections) that are included in the cross section is preferably 100 mm or less, more preferably 50 mm or less, and still more preferably 20 mm or less. In addition, the diameter of the circle having the smallest diameter is preferably 10 μm or more, more preferably 100 μm or more, and still more preferably 1 mm or more. When the diameters are set within the above preferable numerical ranges, it is possible to secure a predetermined number or more of the resonance portions  21  (base portions  22 ) that are installed on the sheet surface  11   a  of the sheet  11  and to obtain more favorable sound-blocking performance, and there is also a tendency that the easiness of molding and the productivity are further enhanced. 
     [Weight Portion] 
     The weight portion  23  is covered with the base portion  22 , which is a resin material, in a state of sticking or adhering to the base portion  22  (being in contact with the base portion  22 ). As described below, the sound-blocking sheet member  100  is formed by installing the weight portions  23  in the cavities of a mold, pouring a resin material into the mold, and curing the resin material. Therefore, the weight portion  23  is configured such that the surface on the sheet side, the surface on the outer peripheral portion side, the surface inside a penetration portion, and the surface on the resonance portion front end side of the weight portion  23  are covered with the base portion in a state of adhering to the base portion. In other words, the base portion  22  is a molded product that is molded in contact with the surface on the resonance portion front end side of the weight portion  23  and covers the weight portion  23 . The base portion covers the surface on the resonance portion front end side of the weight portion, whereby it is possible to make the weight portion not easily drop due to an anchoring effect. The coating ratio of the surface on the resonance portion front end side of the weight portion with the base portion (the ratio of the area covered with the base portion in a state of adhering to the weight portion to the area of the surface on the resonance portion front end side) is preferably 80% or more and particularly preferably 100%. 
     The weight portion  23  is not particularly limited as long as the weight portion  23  has a penetration portion and has a larger mass than the above-described base portion  22 . The weight having the penetration portion will be described with drawings. 
       FIG. 2A  shows the resonance portion including the base portion  22  and the weight portion  23 , and  FIG. 2B  shows the weight portion  23 . As shown in  FIG. 2A , the outer peripheral portion and the inside of the penetration portion of the weight portion  23  are filled with the resin. The weight portion  23  has the penetration portion, whereby the resin does not only reach the outer peripheral portion side of the weight portion but also passes through the inside of the penetration portion to reach the surface on the resonance portion front end side of the weight portion. Therefore, it is easy to fill the outer peripheral portion and the inside of the penetration portion with the resin, and, even in a case where an air bubble is generated, it is possible to let the air bubble out and to improve the coating ratio. 
     In the present invention, the weight having the penetration portion refers to a weight having a penetration portion as shown in  FIG. 2B , and examples thereof include a donut, a washer, a nut, and the like. Since a washer and a nut are general-purpose products that are widely used even in other applications, when a washer or a nut is used as the weight portion  23 , it is possible to realize significant cost reduction. In addition, since a nut has a groove, which is to engage with a screw, formed on the inner wall of a through-hole, this groove is filled with the resin, whereby it is possible to obtain an additional effect of making the weight portion not easily drop. 
     The shape of the weight is not particularly limited, but is preferably a plate shape from the viewpoint of the adjustment of sound-blocking performance and thickness reduction. When the weight portion has a plate shape, it becomes possible to place the center of gravity of the weight at a position away from the substrate compared with a case where the weight is a sphere or the like, and there is a tendency that it is possible to increase the vibration moment of the resonance portion. For example, in a case where the acoustic bandgap width is set to be constant, it becomes possible to thin the weight having a plate shape of the present invention compared with a case where the weight is a sphere or the like. On the other hand, in a case where the height of the weight is set to be constant, it becomes possible for the weight having a plate shape of the present invention to obtain a wide bandgap width compared with a case where the weight is a sphere or the like. The penetration portion may be a through-hole as shown in  FIG. 2B  or may not be a hole. In a case where the penetration portion is not a hole, examples of the penetration portion include a penetration portion having a “C shape” in which a part of an annular portion in the circumferential direction is separated as in a spring washer. 
     It should be noted that  FIG. 1 ,  FIG. 3  to  FIG. 8  do not show the penetration portion of the weight portion  23 , but the weight portion  23  has the penetration portion as shown in  FIGS. 2 and 3 . 
     In the present embodiment, the weight portion is formed in a substantially circular shape in which the outer diameter of the weight is smaller than that of the base portion  22  and is buried in the base portion  22  on the front end side of the resonance portion  21 . As described above, since a configuration in which the weight portion  23  acting as a weight of a resonator is supported by the base portion  22  that determines the spring constant is adopted, it is possible to easily control the resonance frequency of the resonance portion  21  by, for example, adjusting the spring constant through a change in the shape or material (elastic modulus or mass) of the base portion  22  or changing the mass of the weight portion  23 . Ordinarily, as the elastic modulus of the base portion  22  decreases, there is a tendency that the acoustic bandgap shifts toward the low frequency side. In addition, as the mass of the weight portion  23  increases, there is a tendency that the acoustic bandgap shifts toward the low frequency side. 
     In  FIG. 2B , hx represents the height of the weight, r 1  represents the outer diameter of the weight, and r 2  represents the diameter (inner diameter) of the penetration portion. 
     The height (hx) of the weight is not particularly limited, but is preferably 0.95 or less and more preferably 0.9 or less in a case where the height of the resonance portion is set to 1. In addition, the height (hx) is preferably 0.2 or more and more preferably 0.3 or more. When the height (hx) is within these ranges, there is a tendency that it is possible to obtain a wide bandgap width while suppressing the height of the sound-blocking sheet member. 
     The outer diameter (r 1 ) of the weight is not particularly limited. In a case where the resonance portion has a circular cross-sectional shape, there is a tendency that the sound-blocking performance is excellent when the outer diameter (r 1 ) is approximately the diameter of the circular cross-sectional shape. While not particularly limited, the maximum value of r 1  is preferably 100 mm or less, more preferably 50 mm or less, and still more preferably 20 mm or less. In addition, the minimum value of r 1  is preferably 10 μm or more, more preferably 100 μm or more, and still more preferably 1 mm or more. When the maximum value and the minimum value are within the above-described preferable numerical ranges, it is possible to obtain favorable sound-blocking performance, and there is a tendency that the easiness of molding and the productivity are further enhanced. 
     The weight may be buried in the resonance portion or may be exposed. In the weight having the penetration portion of the present invention, even the penetration portion of the weight is filled with the resin material or the like, and even this portion acts as a fixation end to the resonance portion. Therefore, even when the weight is exposed, it is possible to suppress the dropping or breakage of the weight. 
     The inner diameter (r 2 ) of the weight is not particularly limited. The maximum value of r 2  is not particularly limited as long as the maximum value of r 2  is smaller than the outer diameter (r 1 ), but the maximum value of r 2  is preferably 90 mm or less, more preferably 40 mm or less, still more preferably 20 mm or less, and particularly preferably 10 mm or less. In addition, the minimum value of r 2  is preferably 2 μm or more, more preferably 50 μm or more, and still more preferably 80 μm or more. When the maximum value and the minimum value are within the above-described preferable numerical ranges, there is a tendency that it becomes easy to fill the penetration portion with the resin material or the like. 
     In addition, the ratio between the outer diameter and the inner diameter of the weight is not particularly limited. 
     The material that configures the weight portion  23  may be appropriately selected in consideration of mass, cost, or the like, and the kind thereof is not particularly limited. From the viewpoint of the size reduction and the improvement of sound-blocking performance of the sound-blocking sheet member  100  and the sound-blocking structure  200 , the material that configures the weight portion  23  is preferably a material having a high specific gravity. 
     Specific examples thereof include metals or alloys such as aluminum, stainless steel, iron, tungsten, gold, silver, copper, lead, zinc, and brass; inorganic glass such as soda glass, quartz glass, and lead glass; composites containing the powder of these metals or alloys, these inorganic glasses, or the like in the resin material of the above-described base portion  22 ; and the like, but the material is not particularly limited thereto. The material, mass, and specific gravity of the weight portion  23  may be determined such that the sound-blocking sheet member  100  and the sound-blocking structure  200  acoustic bandgap matches a desired sound-blocking frequency range. 
     Among these, at least one selected from the group consisting of metal, alloy, and inorganic glass is preferable from the viewpoint of a low cost, a high specific gravity, or the like. It should be noted that the specific gravity means the ratio between the mass of a material and the mass of an equal volume of pure water at a pressure of 1013.25 hPa and 4° C., and, in the present specification, a value measured by JIS K 0061 “Test methods for density and relative density of chemical products” is used. 
     On the surface (also including the penetration portion) of the weight portion  23 , a surface treatment may be performed in order to enhance process suitability or member strength. 
     For example, it is conceivable to perform a chemical treatment with a solvent or the like for enhancing the sticking property to the base portion  22  or to perform a physical treatment that increases the member strength by providing a protrusion and a recess on the surface, but the method for the surface treatment is not particularly limited. 
     In the present embodiment, the weight portion  23  is buried in the base portion  22  at the front end side of the resonance portion  21 , but the installation position thereof is not particularly limited thereto. While depending on the shapes, masses, elastic moduli, and the like of the base portion  22  and the weight portion  23 , the base portion  22  and the weight portion  23  are preferably disposed such that the center of gravity (mass center) of the resonance portion  21  is positioned at least on the front end side of the center of the resonance portion  21  in the height direction from the viewpoint of the thickness reduction, weight reduction, or sound-blocking performance improvement of the sound-blocking sheet member. Typically, the weight portion  23  may be offset-disposed on the front end side of the center of the resonance portion  21  in the height direction. 
     It should be noted that the weight portion  23  may be buried completely or only partially in the base portion  22  or may be provided on the base portion  22  without being buried in the base portion  22 . In addition, in a case where the base portion  22  has a branched structure, from the viewpoint of the weight reduction or sound-blocking performance improvement of the sound-blocking sheet member, the weight portion  23  is preferably disposed so as to be positioned on the front end side of the center of a branch portion provided from a branch point in a case where the weight portion is provided at the branch portion. 
     Furthermore, the shapes and heights of the plurality of weight portions  23  included in the sound-blocking sheet member may be identical or different. 
     It should be noted that, while the plurality of resonance portions  21  are provided on the sheet surface  11   a  of the sheet  11 , the material that configures the resonance portion  21 , the array, shape, and size of the resonance portion  21 , the installation direction of the resonance portion  21 , and the like may not be identical at all times in all of the plurality of resonance portions  21 . When a plurality of kinds of the resonance portions  21  that are different in at least one of the above-described properties are installed, it is possible to expand the frequency range in which high sound-blocking performance appears. 
     [Protrusion Portion] 
     The sound-blocking sheet member of the present invention may have other protrusion portions in addition to the resonance portions. For example, the sound-blocking sheet member may have a rib-shaped protrusion portion or the like. 
     In the present embodiment, rib-shaped protrusion portions  31  are each molded in a substantially plate-like outer shape so as to extend in the length direction (sheet flow direction or MD direction) of the sheet  11 . The rib-shaped protrusion portions  31  are each provided on the sheet surface  11   a  of the sheet  11 , more specifically, at two places in the edge portions of the sheet  11  in the width direction (direction perpendicular to sheet flow direction or TD direction). 
     The rib-shaped protrusion portion  31  has a maximum height H 2  higher than the maximum height H 1  of the above-described resonance portion  21  in the normal direction of the sheet  11 . Therefore, even when the sound-blocking sheet member  100  is wound in a sheet shape or a plurality of the sound-blocking sheet members  100  are laminated, the rib-shaped protrusion portions  31  function as a spacer, and thus the contact of the resonance portions  21  with the rear surface of the sheet  11  is suppressed. Therefore, the provision of the rib-shaped protrusion portions  31  facilitates the manufacturing by a roll-to-roll method and storage of the sound-blocking sheet member  100  without causing any manufacturing trouble such as the deformation, variation, cracking, dropping, breakage, or the like of the resonance portion  21 . In addition, the rib-shaped protrusion portion is also capable of functioning as a vibrator (resonator) that vibrates at a certain frequency when a sound wave is incident from a noise source. 
     The shape of the protrusion portion is also not particularly limited, and, in the case of being caused to function as a spacer, the protrusion portion may be higher than the maximum height H 1  of the resonance portion  21 . In addition, in a case where the protrusion portions are caused to function as a vibrator, it is possible to adjust the positions, number, and heights of the protrusion portions provided in accordance with a frequency range to be adjusted. 
     It should be noted that the maximum height H 2  of the rib-shaped protrusion portion  31  may be higher than the maximum height H 1  of the resonance portion  21  and is not particularly limited. From the viewpoint of the easiness of molding and the improvement of productivity, the maximum height H 2  is preferably 50 μm or more, more preferably 100 μm or more, and still more preferably 1 mm or more. In addition, the maximum height H 2  is preferably 20 mm or less, more preferably 15 mm or less, still more preferably 10 mm or less, far still more preferably 5 mm or less, and particularly preferably 3 mm or less. 
     The shape and installation positions of the rib-shaped protrusion portions  31  are not particularly limited as long as the rib-shaped protrusion portions  31  are installed so as not to interfere with the resonance portions  21  acting as a resonator. For example, the outer shape of the rib-shaped protrusion portion  31  is not particularly limited, and it is possible to adopt any shape such as a triangular columnar shape, a rectangular columnar shape, a trapezoidal columnar shape, a polygonal columnar shape such as a pentagonal column or a hexagonal column, a cylindrical columnar shape, an elliptical columnar shape, a truncated pyramid shape, a truncated cone shape, a prismatic shape, a conical shape, a hollow tubular shape, or an indefinite shape that is not classified into the above-described shapes. In addition, it is also possible to form the rib-shaped protrusion portion  31  in a columnar shape having a cross-sectional area and/or cross-sectional shape (at least one of the cross-sectional area and the cross-sectional shape) that varies depending on the height position of the rib-shaped protrusion portion  31 . Furthermore, the maximum length of the rib-shaped protrusion portion  31  in the length direction of the sheet  11  is not particularly limited as long as the maximum length is equal to or less than the maximum length in the MD direction of the sheet. 
     It should be noted that, in the present embodiment, a pair of the rib-shaped protrusion portions  31  extending in the length direction of the sheet  11  is adopted, but a plurality of the rib-shaped protrusion portions  31  having a shorter maximum length than the above-described rib-shaped protrusions may be disposed apart along the length direction of the sheet  11 . At this time, the disposed disposition interval between the individual rib-shaped protrusion portions  31  may be periodic or random. In the case of disposing the plurality of rib-shaped protrusion portions  31  apart as described above, the distance between the individual rib-shaped protrusion portions  31  is not particularly limited, but is preferably 100 mm or less, more preferably 50 mm or less, and still more preferably 20 mm or less. 
     The material that configures the rib-shaped protrusion portion  31  is not particularly limited, but is preferably the same resin material as the sheet  11  and/or the resonance portion  21  (base portion  22 ) and more preferably the same elastomer as the sheet  11  and the resonance portion  21  (base portion  22 ). When the same resin material as the sheet  11  and/or the base portion  22  is adopted, the integral molding with the sheet  11  and/or the resonance portion  21  (base portion  22 ) becomes easy, and the productivity is significantly enhanced. 
     [Support] 
     The sound-blocking sheet member of the present invention can be appropriately installed in accordance to an environment in which the sound-blocking performance is developed. For example, the sound-blocking sheet member may be installed directly on a device, a structure, or the like. Between the sound-blocking sheet member and the device, the structure, or the like, an adhesive layer or the like may be provided. In addition, the sound-blocking sheet member may be used in a form of being supported by the support. The support may support the sound-blocking sheet member at the time of blocking sound using the sound-blocking sheet member of the present invention, and the sound-blocking sheet member may not be supported by the support during manufacturing, storage, or the like. 
     The support may be provided in contact with at least one surface of the sheet of the sound-blocking sheet member and may be provided on the sheet surface on which the resonance portions are provided in contact with the sheet surface and/or may be provided on the other surface of the sheet surface on which the resonance portions are provided in contact with the other surface. 
     In the present embodiment, the support  51  is provided on the sheet surface  11   b  side on the rear side of the sheet  11 . The material that configures the support  51  is not particularly limited as long as the material is capable of supporting the sheet  11 , but is preferably a material having higher stiffness than the sheet  11  from the viewpoint of enhancing the sound-blocking performance. Specifically, the support  51  preferably has a Young&#39;s modulus of 1 GPa or more and more preferably has a Young&#39;s modulus of 1.5 GPa or more. The upper limit is not particularly limited and is, for example, 1000 GPa or less. 
     In addition, in a case where the sound-blocking sheet member is installed directly on a device, a structure, or the like, the surface on which the sound-blocking sheet member is installed preferably has the same stiffness as the support from the viewpoint of supporting the sheet, the viewpoint of enhancing the sound-blocking performance, or the like. 
     The material that configures the support  51  is not particularly limited. Examples thereof include a photocurable resin sheet, a thermosetting resin sheet, a thermoplastic resin sheet, a metal plate, an alloy plate, and the like. Examples of the photocurable resin sheet, the thermosetting resin sheet, and the thermoplastic resin sheet include sheets and the like for which the photocurable resin, the thermosetting resin, and the thermoplastic resin exemplified in the section of the base portion are used. 
     Specific examples of the material that configures the support  51  include, for example, polyester resins such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, and polybutylene succinate, poly (meth)acrylate resins such as polymethylmethacrylate, polycarbonate resins such as polycarbonate containing isosorbide as a main raw material, polyolefin resins such as polyethylene, polypropylene, and polynorbornene, organic materials such as vinyl chloride resins, polyacrylonitrile, polyvinylidene chloride, polyether sulfone, polyphenylene sulfide, polyarylate, polyamide, polyimide, triacetyl cellulose, polystyrene, epoxy resins, and oxazine resins, composite materials containing metal such as aluminum, stainless steel, iron, copper, zinc, or brass, inorganic glass, inorganic particles, or a fiber in the organic material, and the like. 
     Among these, the support is preferably at least one kind 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 viewpoint of sound-blocking property, stiffness, moldability, cost, and the like. Here, the thickness of the support  51  is not particularly limited, but is, usually, preferably 0.05 mm or more and 0.5 mm or less from the viewpoint of sound-blocking performance, stiffness, moldability, weight reduction, cost, and the like. 
     Furthermore, the support  51  may have a coating layer provided on the surface of the support  51  from the viewpoint of light permeability, a sticking property to the sound-blocking sheet member, or the like. 
     It should be noted that the shape of the support  51  can be appropriately set depending on the installation surface of the sound-blocking structure  200  and is not particularly limited. For example, the shape of the support  51  may be a flat sheet shape, a curved sheet shape, or a special shape processed so as to have a curved surface portion, a folded portion, or the like. Furthermore, from the viewpoint of weight reduction or the like, a notch, a punched portion, or the like may be provided at any place in the support  51 . 
     In addition, the surface density (mass per unit area) of the support  51  can be appropriately set depending on desired performance and is not particularly limited. From the viewpoint of enhancing the effect of the present invention, the surface density of the support  51  is preferably 80% or less, more preferably 30% or less, and still more preferably 10% or less of the surface density of the sound-blocking sheet member  100 . 
     Second Embodiment 
       FIG. 8  is a schematic perspective view showing a sound-blocking sheet member  101  and a sound-blocking structure  201  of the present embodiment and a cross-sectional view thereof taken along the arrow. In the present embodiment, since the sound-blocking sheet member  101  and the sound-blocking structure  201  have the same configurations as the sound-blocking sheet member  100  and the sound-blocking structure  200  of the first embodiment described above except the fact that the number of the resonance portions installed, the shapes of the base portion and the weight portion, and the shape and number of the rib-shaped protrusion portions installed are different, duplicate description will not be made. 
     The resonance portion  21  of the present embodiment is formed of a composite structure including a base portion  24  and a weight portion  25  that is supported by the base portion  24  and has a larger mass than the base portion  24 . In the present embodiment as well, a plurality of the base portions  24  having a substantially cylindrical outer shape are provided in contact with the sheet surface  11   a  of the sheet  11 . 
     Rib-shaped protrusion portions  32  of the present embodiment are molded in a substantially cylindrical outer shape, and the individual rib-shaped protrusion portions  32  are disposed apart so as to form individual rows along the length direction (sheet flow direction or MD direction) of the sheet  11  at the edge portions of the sheet  11  in the width direction (direction perpendicular to sheet flow direction or TD direction). 
     In the present embodiment as well, the same action and effect as in the above-described first embodiment is exhibited. In addition to that, in the present embodiment, since the plurality of rib-shaped protrusion portions  32  are disposed apart so as to form rows, the followability (flexibility) of the sound-blocking sheet member  101  is further enhanced. Therefore, even for a target attachment surface having a more complicated shape, the stretchable flexible sheet  11  is capable of following the surface shape of the target attachment surface, and as a result, it is possible to stably mount the sheet  11  on the support  51 . 
     [Manufacturing Method] 
     A method for manufacturing the sound-blocking sheet member and the sound-blocking structure of the present invention is not particularly limited. Examples thereof include the following manufacturing methods 1 to 4. 
     The shape of a cavity used in each manufacturing method is not particularly limited, and, for example, as the shape of the bottom, it is possible to appropriately select a hemispherical shape, a planar shape, a protrusion shape, a recess shape, or the like. 
     (Manufacturing Method 1) 
     The manufacturing method 1 may include the following steps (1) to (3). 
     (1) A step of preparing a mold having a plurality of cavities and pouring a resin material into the cavities. 
     (2) A step of curing the poured resin material. 
     (3) A step of peeling the obtained cured product from the mold. 
     In the manufacturing method 1, after the step (2) or (3), a step of providing a support in a shape of the obtained cured product may also be provided. 
     (Manufacturing Method 2) 
     The manufacturing method 2 may include the following steps (4) to (7). 
     (4) A step of preparing a mold having a plurality of cavities and disposing weights in the plurality of cavities provided in the mold. 
     (5) A step of pouring a resin material into the cavities. 
     (6) A step of curing the poured resin material. 
     (7) A step of peeling the obtained cured product from the mold. 
     In the manufacturing method 2, after the step (6) or (7), a step of providing a support in a shape of the obtained cured product may also be provided. 
     (Manufacturing Method 3) 
     The manufacturing method 3 may include the following steps (8) to (11). 
     (8) A step of applying a photocurable elastomer precursor or a photocurable resin precursor to a mold having a plurality of cavities. 
     (9) A step of laminating a substrate on the elastomer precursor or resin precursor flattened on a mold. 
     (10) A step of filling the cavities with the elastomer precursor or the resin precursor by pressurizing the laminate of a support and the mold from the substrate side with a pressurization roll. 
     (11) A step of irradiating light from the substrate side to cure the elastomer precursor or the resin precursor in which the cavity shape of the mold is transferred and formed and to polymerize and adhere the cured product of the elastomer precursor or the resin precursor to the substrate. 
     (12) (11) A step of peeling a product obtained by adhering the cured product of the elastomer precursor or resin precursor and the substrate from the mold. 
     (Manufacturing Method 4) 
     The manufacturing method 4 may include the following steps (13) to (15). 
     (13) A step of, while making a substrate to travel in the rotating direction of a roll mold having an outer peripheral surface in which a plurality of cavities are arrayed along the outer peripheral surface of the roll mold by rotating the roll mold, applying a photocurable elastomer precursor or a photocurable resin precursor to the outer peripheral surface of the roll mold and filling the cavities with the elastomer precursor or resin precursor. 
     (14) A step of irradiating a region between the outer peripheral surface of the roll mold and the substrate with light in a state in which the elastomer precursor or resin precursor is sandwiched between the outer peripheral surface of the roll mold and the substrate. 
     (15) A step of peeling a substance to which a cured product of the elastomer precursor or resin precursor obtained in the step (14) and the substrate adhered from the roll mold. 
     In the steps (10) and (11) of the manufacturing method 3 and the steps (13) and (14) of the manufacturing method 4, it is possible to form a sound-blocking sheet member having a resonance portion and a sheet. 
     The substrate that is used in the manufacturing methods 3 and 4 is not particularly limited. The sound-blocking sheet member formed on the substrate may be used as it is or may be used after the substrate is peeled. 
     After the step (11) or (12) of the manufacturing method 3 and the step (14) or (15) of the manufacturing method 4, a step of providing a support may be further provided. In addition, the substrate may be a support. 
     The steps (10) and (11) of the manufacturing method 3 and the steps (13) and (14) of the manufacturing method 4 may be provided a plurality of times. For example, in the manufacturing method 4, the steps may be performed in an order of the steps (13), (14), (13), (14), and (15). 
     In addition, in the case of providing the above-described steps a plurality of times, the photocurable elastomer precursor or photocurable resin precursor used may be different. For example, in the manufacturing method 4, the photocurable elastomer precursors or photocurable resin precursors that are used in the first stage of the step (13) and the second stage of the step (13) may be different. The cured product (resonance portion) that is obtained in the step (15) may be made to be include a base portion and a weight portion by mixing metal powder or the like into the photocurable elastomer precursor or photocurable resin precursor for the second stage. 
     For the manufacturing methods 3, 4, and the like, it is possible to refer to the manufacturing methods described in PCT International Publication No. WO 2010/3080794 and the like. 
     In these manufacturing methods 1 to 4, it is also possible to use, for example, a mold having a protrusion in a cavity as shown in  FIG. 44 . In this case, it is possible to form the resonance portion  21  as shown in  FIG. 42 . The resonance portion in  FIG. 42  has a void at which the front end side surface is indented, and the void is formed in the penetration portion. 
     (One Form of Method for Manufacturing Sound-Blocking Sheet Member Using First Embodiment) 
     One form of a method for manufacturing a sound-blocking sheet member using the above-described embodiment 1 will be described. The method for manufacturing a sound-blocking sheet member and a sound-blocking structure of the present invention is not limited thereto. In addition, it is also possible to appropriately apply this form to other embodiments. 
     The sound-blocking sheet member  100  can be obtained by providing the resonance portions  21  and the rib-shaped protrusion portions  31  described above on the sheet surface  11   a  of the sheet  11 . The method for installing the resonance portions  21  and the rib-shaped protrusion portions  31  is not particularly limited. Examples thereof include a method in which separately molded individual components are crimped by heating and pressurization or pressurization, a method in which the components are adhered using a variety of well-known adhesives, a method in which the components are joined by heat welding, ultrasonic welding, laser welding, or the like. Examples of the adhesive include an epoxy resin-based adhesive, an acrylic resin-based adhesive, a polyurethane resin-based adhesive, a silicone resin-based adhesive, a polyolefin resin-based adhesive, a polyvinyl butyral resin-based adhesives, a mixture thereof, and the like, but the adhesive is not particularly limited thereto. It should be noted that a part or all of the resonance portions  21  and the rib-shaped protrusion portions  31  can also be formed by punching a rubber plate obtained by the above-described molding method. In addition, in a case where a part of the resonance portions  21  are metal or an alloy, it is possible to form the resonance portions  21  by cutting the metal or the alloy. 
     In addition, a method in which the resonance portions  21  are manufactured using a 3D printer or the like can also be exemplified. 
     From the viewpoint of enhancing the productivity and the economic efficiency, a method in which the sound-blocking sheet member  100  is integrally molded by mold molding, casting mold molding, or the like is preferable. As an example thereof, exemplified is a method in which an integrally molded product of the resonance portions  21 , the sheet  11 , the resonance portions  21 , and the rib-shaped protrusion portion  31  is molded using a mold or a casting mold with cavities having shapes corresponding to the integrally molded product of the sheet  11 , the resonance portions  21 , and the rib-shaped protrusion portions  31 . As such an integral molding method, known are a variety of well-known methods such as a press molding method, a compression molding method, a casting molding method, an extrusion molding method, and an injection molding method, and the kind thereof is not particularly limited. It should be noted that, as long as the raw material of each component is, for example, a resin material having rubber elasticity, it is possible to pour the raw material into the cavities in a form of a liquid-phase precursor or a heated melt. In addition, as long as the raw material is metal, an alloy, or inorganic glass, it is possible to dispose (insert) the raw material in advance at a predetermined position in the cavity. 
     The resin material is not particularly limited. Examples thereof include a sheet that is the sound-blocking sheet member of the present invention, the materials exemplified in the sections of the base portion and the like, the raw materials and intermediates thereof, and the like. 
       FIG. 4  to  FIG. 7  are views showing an example of manufacturing steps of the sound-blocking sheet member  100 . Here, a mold  61  having cavities  61   a  having a shape corresponding to the above-described resonance portion  21  and cavities  61   b  having a shape corresponding to the rib-shaped protrusion portion  31  is used (refer to  FIG. 4 ), the weight portions  23  are disposed in the cavities  61   a  of the mold  61  (refer to  FIG. 5 ), then, a resin material having rubber elasticity is poured into the cavities  61   a  and  61   b  and heated or pressurized as necessary (refer to  FIG. 6 ), and then the integrally molded product of the sheet  11 , the resonance portions  21 , and the rib-shaped protrusion portions  31  is released from the mold, thereby obtaining the sound-blocking sheet member  100 . According to such an integral molding method, not only are the productivity and the economic efficiency enhanced, but it is also possible to easily mold the integrally molded product even when the integrally molded product has a complicated shape, furthermore, the sticking force of each component is enhanced, and there is a tendency that the sound-blocking sheet member  100  having excellent mechanical strength is easily obtained. From these viewpoints as well, the sheet  11 , the resonance portions  21 , and the rib-shaped protrusion portions  31  are preferably an integrally molded product containing a thermoset elastomer or a thermoplastic elastomer. 
     [Action and Effect] 
     The sound-blocking sheet members  100  and  101  and the sound-blocking structures  200  and  201  of the present embodiment have a configuration in which the plurality of resonance portions  21  are provided in contact with the sheet surface  11   a  of the sheet  11  having rubber elasticity. Therefore, when a sound wave is incident from a noise source, it is possible to obtain high sound-blocking performance overwhelming the law of mass action. In addition, it is possible to easily control the resonance frequency of the resonance portions  21  by the adjustment of the spring constant, a change in the mass of the weight portion  23 , or the like through a change in the shapes, density distributions, or materials (elastic moduli and masses) of the resonance portion  21  and the base portion  22 . Furthermore, it is also possible to control frequency bands (acoustic bandgap widths and frequency positions) with the material, thickness, or the like of the sheet  11 . Therefore, the sound-blocking sheet members  100  and  101  and the sound-blocking structures  200  and  201  of the present embodiment are excellent in terms of the degree of freedom in selecting the sound-blocking frequency and the degree of freedom in design compared with conventional sound-blocking sheet members and sound-blocking structures. 
     In addition, in the sound-blocking sheet members  100  and  101  and the sound-blocking structures  200  and  201  of the present embodiment, the resonance portions  21  and the rib-shaped protrusion portions  31  are provided in contact with one sheet surface  11   a  of the sheet  11  having rubber elasticity and are not provided on the other sheet surface  11   b . Therefore, even when the support  51  is, for example, a non-flat surface having a curved surface or the like, the stretchable flexible sheet  11  is capable of following the surface shape of the target attachment surface, and as a result, it is possible to stably mount the sheet  11  on the support  51 . Therefore, the sound-blocking sheet members  100  and  101  and the sound-blocking structures  200  and  201  of the present embodiment are excellent in terms of handleability and versatility compared with conventional sound-blocking sheet members and sound-blocking structures. 
     In addition, in a case where the sheet  11  and the resonance portions  21  are integrally molded, since it becomes possible to collectively install the plurality of resonance portions  21  (resonators), the productivity and the handleability significantly improve. 
     Since the rib-shaped protrusion portions  31  and  32  having the higher maximum height H 2  than the maximum height H 1  of the resonance portion  21  are disposed, even when the sound-blocking sheet members  100  and  101  are wound in a sheet shape or a plurality of the sound-blocking sheet members  100  and  101  are laminated, the rib-shaped protrusion portions  31  and  32  function as a spacer, and the contact of the resonance portions  21  with the rear surface of the sheet  11  is suppressed. Therefore, it becomes easy to continuously produce and store the sound-blocking sheet members  100  and  101  by a so-called roll-to-roll method without causing any manufacturing trouble such as the deformation, variation, cracking, dropping, breakage, or the like of the resonance portion  21 , compared with batch production for each sheet, the production speed improves, and the productivity and the economic efficiency are enhanced. 
     [Sound-Blocking Structure] 
     The sound-blocking sheet member of the present invention can be used as a sound-blocking structure. As described in the above-described embodiment, the sound-blocking structure may have a support, rib-shaped protrusion portions, and the like. 
     In addition, as an example of the usage of the sound-blocking sheet member of the present invention, conceivable is a usage in which the sound-blocking sheet member is attached to the inside or outside of a small electronic device for reducing noise such as the motor sound of a small electronic device or the like, the switching sound in an electronic circuit, or the like. 
     The sound-blocking structure may be a laminate including the sound-blocking sheet member of the present invention. For example, the sound-blocking sheet members  101  may be provided on both surfaces of the support  51 . In addition, a plurality of the sound-blocking structures having the sound-blocking sheet member provided on the support may be laminated and used. When a plurality of the sound-blocking sheet members are combined, it is possible to control the acoustic bandgap width, the frequency position, or the like. 
     In addition, even a laminate having the sound-blocking sheet members on both surfaces of the support is capable of following a non-flat surface or the like having a curved surface or the like as long as a housing including the support and the laminate is flexible, and thus it is also possible to stably mount the sound-blocking structure. 
     The positional relationship between the resonance portions of the sound-blocking sheet member and the sheet in the case of being used as the sound-blocking structure is not particularly limited, and it is possible to use the resonance portions and the sheet as in, for example, the cross-sectional view of a structure shown in  FIG. 9 . 
     The sound-blocking structure  203  of  FIG. 9  has the sheet  11 , the resonance portions  21 , the rib-shaped protrusion portions  32 , and a sheet  70 . The sound-blocking structure  203  is installed on a sound-blocking structure installation object (for example, a window)  300 . In a case where the weight of the sound-blocking structure installation object  300  is heavier than that of the support or the like, the sheet is not directly installed on the sound-blocking structure installation object as shown in  FIG. 16 , whereby there is a case where an acoustic bandgap is likely to be generated and high sound-blocking performance is obtained. 
     EXAMPLES 
     Hereinafter, the present invention will be more specifically described using examples, but the present invention is not limited to these examples. The present invention is capable of adopting a variety of conditions within the scope of the gist of the present invention as long as the object of the present invention is achieved. 
     [Calculation of Acoustic Bandgap] 
     For each of parts i to iv of sheets, physical properties (specific gravity, Young&#39;s modulus, and Poisson&#39;s ratio) and material dimensions r 1 , r 2 , h, and a shown in the ‘Example 1’ column of Table 1 were assigned into the equation of the solid mechanics module of the multiphysics analysis software COMSOL Multiphysics (COMSOL), and acoustic bandgaps were calculated using the finite element method. 
     In addition, in order to compare the sizes of acoustic bandgaps, standardized acoustic bandgap widths [((acoustic bandgap maximum frequency)−(acoustic bandgap minimum frequency))÷(acoustic bandgap center frequency)] were obtained. 
     Example 1 
     Example 1 is a unit cell including a sound-blocking sheet member shown in  FIG. 10A . 
     The sizes, materials, and physical properties of the constituent members of the unit cell are shown in Table 1. The acoustic bandgap in the unit cell was calculated based on the above-described calculation method. 
     As a result of the calculation, it was confirmed that, in Example 1, the acoustic bandgap was 3461 to 4551 Hz, the standardized acoustic bandgap width was 0.27, and the sheet had a sufficient sound-blocking bandwidth. 
     Comparative Example 1 
     Comparative Example 1 is a unit cell including the sound-blocking sheet member shown in  FIG. 10A , and the sizes, materials, and physical properties of the constituent members of the unit cell are shown in Table 1. 
     As a result of calculating the acoustic bandgap by the same method as in Example 1, it was confirmed that the acoustic bandgap was 7185 to 7804 Hz, the standardized acoustic bandgap width was 0.08, and it was not possible to sufficiently widen the sound-blocking bandwidth. From the comparison between Example 1 and Comparative Example 1, it was confirmed that the use of a weight widened the standardized acoustic bandgap width. 
     Comparative Example 2 
     Comparative Example 2 is a unit cell including the sound-blocking sheet member shown in  FIG. 10A  and is an example in which a weight portion having no through-hole was used. The sizes, materials, and physical properties of the constituent members of the unit cell are shown in Table 1. 
     As a result of calculating the acoustic bandgap by the same method as in Example 1, it was confirmed that the acoustic bandgap was 3345 to 4467 Hz, the standardized acoustic bandgap width was 0.29, and the sheet had a sufficient sound-blocking bandwidth. 
     Comparative Example 3 
     Comparative Example 3 is a unit cell including a sound-blocking sheet member shown in  FIG. 10B , and the sizes, materials, and physical properties of the constituent members of the unit cell are shown in Table 1. 
     The acoustic bandgap was calculated by the same method as in Example 1. As a result of the calculation, it was confirmed that the acoustic bandgap was 4157 to 4733 Hz, the standardized acoustic bandgap width was 0.13, and it was not possible to sufficiently widen the sound-blocking bandwidth. 
     From the comparison between Example 1 and Comparative Example 3, it was confirmed that, in a case where the sound-blocking materials had substantially the same thickness, it was possible to increase the acoustic bandgap width by using a plate-shaped weight. 
     [Measurement of Coating Ratio] 
     The weight portion was placed in the center of a petri dish having an inner dimension of 16 mm, an outer dimension of 19 mm, and a height of 12 mm, and Sylgard 184 (Toray Dow Corning Co., Ltd.) was dropped onto the petri dish. The appearance of the dropped Sylgard 184 wrapping around the bottom surface of the weight was observed, and the coating ratio on the front end side surface was measured. The coating ratio is expressed as the ratio of the area of the resonance portion front end side surface covered with the resin by sticking and adhesion to the area of the resonance portion front end side surface of the resonance portion of the weight portion. 
     [Evaluation of Member Strength] 
     
       
         
           
               
               
               
               
               
               
               
               
               
               
               
               
               
             
               
                   
                 TABLE 1 
               
               
                   
                   
               
               
                   
                   
                   
                   
                   
                   
                   
                 Specific 
                 Young&#39;s 
                   
                 Maximum 
                 Acoustic 
                 Standardized 
               
               
                   
                   
                 r1 
                 r2 
                 h 
                 a 
                   
                 gravity 
                 modulus 
                 Poisson&#39;s 
                 height 
                 bandgap 
                 acoustic bandgap 
               
               
                   
                 Part 
                 (mm) 
                 (mm) 
                 (mm) 
                 (mm) 
                 Material 
                 (g/cm 3 ) 
                 (MPa) 
                 ratio 
                 (mm) 
                 (Hz) 
                 width 
               
               
                   
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
               
               
               
               
            
               
                 Example 1 
                 i 
                 5 
                 1.5 
                 0.8 
                 — 
                 Iron 
                 7.87 
                 206000 
                 0.3 
                 2 
                 3461 to 4551 
                 0.27 
               
               
                   
                 ii 
                 5 
                 — 
                 0.7 
                 — 
                 Rubber 
                 1.05 
                 10 
                 0.49 
               
               
                   
                 iii 
                 — 
                 — 
                 0.5 
                 15 
                 Rubber 
                 1.05 
                 10 
                 0.49 
               
               
                   
                 iv 
                 — 
                 — 
                 1 
                 15 
                 Aluminum 
                 2.702 
                 63300 
                 0.29 
               
               
                 Comparative 
                 ii 
                 5 
                 — 
                 1.5 
                 — 
                 Rubber 
                 1.05 
                 10 
                 0.49 
                 2 
                 7185 to 7804 
                 0.08 
               
               
                 Example 1 
                 iii 
                 — 
                 — 
                 0.5 
                 15 
                 Rubber 
                 1.05 
                 10 
                 0.49 
               
               
                 (no weight) 
                 iv 
                 — 
                 — 
                 1 
                 15 
                 Aluminum 
                 2.702 
                 63300 
                 0.29 
               
               
                 Comparative 
                 i 
                 5 
                 — 
                 0.8 
                 — 
                 Iron 
                 7.87 
                 206000 
                 0.3 
                 2 
                 3345 to 4467 
                 0.29 
               
               
                 Example 2 
                 ii 
                 5 
                 — 
                 0.7 
                 — 
                 Rubber 
                 1.05 
                 10 
                 0.49 
               
               
                 (weight 
                 iii 
                 — 
                 — 
                 0.5 
                 15 
                 Rubber 
                 1.05 
                 10 
                 0.49 
               
               
                 cylinder) 
                 iv 
                 — 
                 — 
                 1 
                 15 
                 Aluminum 
                 2.702 
                 63300 
                 0.29 
               
               
                 Comparative 
                 i 
                   0.75 
                 — 
                 0.75 
                 — 
                 Rubber 
                 7.87 
                 206000 
                 0.3 
                 2 
                 4157 to 4733 
                 0.13 
               
               
                 Example 3 
                 ii 
                   0.65 
                 — 
                 0.75 
                 — 
                 Iron 
                 1.05 
                 10 
                 0.49 
               
               
                 (weight 
                 iii 
                 — 
                 — 
                 0.5 
                   2.5 
                 Rubber 
                 1.05 
                 10 
                 0.49 
               
               
                 sphere) 
                 iv 
                 — 
                 — 
                 1 
                   2.5 
                 Aluminum 
                 2.702 
                 63300 
                 0.29 
               
               
                   
               
            
           
         
       
     
     The strength was obtained from stress in a portion at which stress concentrated most in the weight portion at the time of pulling the weight portion in the surface direction of the sheet surface with a constant force. 
     Next, for Example 1 and Comparative Example 2, the coating ratios were measured, and the member strengths were evaluated. The results are shown in Table 2. The values of strength in Table 2 are standardized values when the stress in Example 1 is regarded as 1. 
     
       
         
           
               
               
               
             
               
                   
                 TABLE 2 
               
               
                   
                   
               
               
                   
                 Coating ratio (%) 
                 Strength 
               
               
                   
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
            
               
                   
                 Example 1 
                 100 
                 1.0 
               
               
                   
                 Comparative Example 2 
                 70.5 
                 0.7 
               
               
                   
                   
               
            
           
         
       
     
     From these results, it was confirmed that, when the weight had a through-hole, it was possible to improve the coating ratio. In Comparative Example 2, at the time of filling the weight portion with the resin from the outer peripheral portion, since an air bubble was generated, and the air bubble was not discharged outside, the coating ratio became 70.5%. On the other hand, in Example 1, an air bubble was generated, but was discharged through the through-hole, and thus that the coating ratio reached 100%. It is conceivable that, when the coating ratio is high, the dropping of the weight is suppressed, and it is possible to improve the durability. 
     Next, manufacturing methods other than the above-described manufacturing methods 1 to 4 and sound-blocking sheet members manufactured by these manufacturing methods will be described. 
     Hereinafter, each embodiment of the present invention will be described with reference to the drawings. It should be noted that each embodiment described below is an example for describing the present invention, and the present invention is not limited only to the embodiment. In addition, in the following description, unless particularly otherwise specified, positional relationships such as up, down, right, and left shall be based on the positional relationships shown in the drawings. Moreover, the dimensional ratios in the drawings are not limited to the ratios shown in the drawings. 
     It should be noted that, in the following description, the same element as a component of the first to third embodiments shown in  FIG. 1  and  FIG. 10  will be given the same reference sign and will not be described again. In addition, in a fourth embodiment, the configuration of a resonance portion is different from that in the third embodiment, and thus the resonance portion will be described below. 
     [Third Embodiment of Sound-Blocking Sheet Member and Manufacturing Method] 
       FIG. 11  is a schematic perspective view showing a structural example of the sound-blocking sheet member  100  and the sound-blocking structure  200  of the third embodiment.  FIG. 12  is a cross-sectional view taken along the line II-II in  FIG. 11 . 
     The sound-blocking sheet member  100  includes a sheet portion  11  having rubber elasticity and the plurality of resonance portions (protrusion portions)  21  provided in contact with the sheet surface  11   a  of the sheet portion  11 . The sound-blocking sheet member  100  is supported by the support  51  provided on the sheet surface  11   b  side on the opposite side of the sheet surface  11   a  of the sheet portion  11 , whereby the sound-blocking structure  200  is configured. 
     In the sound-blocking sheet member  100  and the sound-blocking structure  200 , for example, when a sound wave is incident from a noise source on the support  51  side, resonance occurs in at least one of the sheet portion  11  and the resonance portions  21 . At this time, the presence of a frequency range in which the direction of a force acting on the support  51  and the direction of acceleration that is generated in at least one of the sheet portion  11  and the resonance portions  21  become opposite to each other becomes possible, a part or all of vibrations at specific frequencies are cancelled, and thus a complete acoustic bandgap in which the vibrations at the specific frequencies almost completely disappear is generated. Therefore, in the vicinity of the resonance frequency of at least one of the sheet portion  11  and the resonance portions  21 , a part or all of vibrations come to rest, and as a result, high sound-blocking performance overwhelming the law of mass action can be obtained. A sound-blocking member that utilizes such a principle is referred to as an acoustic metamaterial. Hereinafter, each component of the sound-blocking sheet member  100  and the sound-blocking structure  200  of the present embodiment will be described in detail. 
     The maximum height of the sheet surface  11   a  provided with the resonance portions  21  from the sheet surface  11   b  to the front end of the resonance portion  21  is not particularly limited and may be appropriately adjusted depending on the application, but is preferably 20 mm or less. The maximum height is more preferably 15 mm or less, still more preferably 10 mm or less, still more preferably 8 mm or less, far still more preferably 5 mm or less, and particularly preferably 3 mm or less. In addition, in a case where the sound-blocking sheet member  100  and the sound-blocking structure  200  are used in an application for blocking sound at high frequencies, the maximum height is preferably 1.0 mm or less. Within the above-described range, the sound-blocking sheet member  100  and the sound-blocking structure  200  have a sound-blocking function, it is possible to reduce the installation space necessary in the sound-blocking sheet member  100  and to maintain the overall size of a small electronic device or the like as small as possible. 
     In addition, the lower limit is not particularly limited, but is, for example, 0.01 mm or more from the viewpoint of the easiness of manufacturing. It should be noted that the maximum height of the sound-blocking sheet member is the height indicated by H in  FIG. 11 , which shows the third embodiment, and represents the height from the sheet surface  11   b  of the sheet portion  11  to the maximum height of the resonance portion  21  in the normal direction to the sheet portion  11 . 
     [Sheet Portion] 
     The sheet portion  11  is a sheet having rubber elasticity. The sheet portion  11  is not particularly limited and may a sheet having rubber elasticity attributed to the molecular motion or the like of a resin (organic polymer). The sheet portion  11  is also capable of functioning as a vibrator (resonator) that vibrates at a certain frequency when a sound wave is incident from a noise source. 
     The material that configures the sheet portion  11  preferably contains at least one selected from the group consisting of a thermoset or photocurable elastomer and a thermoplastic elastomer. 
     Specific examples of the material that configures the sheet portion  11  include thermosetting resin-based elastomers such as a vulcanized thermosetting resin-based elastomer such as chemically crosslinked natural rubber or synthetic rubber, a urethane-based thermosetting resin-based elastomer, a silicone-based thermosetting resin-based elastomer, fluorine-based thermosetting resin-based elastomers, and acrylic thermosetting resin-based elastomers; thermoplastic elastomers such as an olefin-based thermoplastic elastomer, a styrene-based thermoplastic elastomer, a vinyl chloride-based thermoplastic elastomer, a urethane-based thermoplastic elastomer, an ester-based thermoplastic elastomer, an amide-based thermoplastic elastomer, a silicone-based thermoplastic elastomer, and an acrylic thermoplastic elastomer; and the like. 
     More specific examples of the thermoset elastomer and the thermoplastic elastomer include rubber. Specific examples thereof include 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, modified bodies thereof, and the like, but are not particularly limited thereto. Among these elastomers, it is possible to use one kind of elastomer singly or two or more kinds of elastomers in combination. 
     Furthermore, 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 bodies thereof are preferable, and silicone rubber, acrylic rubber, and modified bodies thereof are more preferable. When these materials are used, there is a tendency that the sheet is excellent in terms of the heat resistance or the cold resistance. 
     The sheet portion  11  may contain a variety of additives such as a flame retardant, an antioxidant, a plasticizer, and a coloring agent as long as the sheet  11  is a sheet having so-called rubber elasticity. 
     The flame retardant is an additive that is blended to make flammable materials not easily burn or ignite. Specific examples thereof include 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 paraffin, antimony compounds such as antimony trioxide, metal hydroxides such as aluminum hydroxide, nitrogen compounds such as melamine cyanurate, boron compounds such as sodium borate, and the like, but are not particularly limited thereto. 
     In addition, the antioxidant is an additive that is blended to prevent oxidation degradation. Specific examples thereof include phenol-based antioxidants, sulfur-based antioxidants, phosphorus-based antioxidants, and the like, but are not limited thereto. 
     Furthermore, the plasticizer is an additive that is blended to improve flexibility and weather resistance. Specific examples thereof include phthalic acid esters, adipic acid esters, trimellitic acid esters, polyesters, phosphoric acid esters, citric acid esters, sebacic acid esters, azelaic acid esters, maleic acid esters, silicone oil, mineral oil, vegetable oil, modified bodies thereof, and the like, but are not particularly limited thereto. 
     Moreover, examples of the coloring agent include colorants, pigments, and the like. 
     Among these additives, it is possible to use one kind of additive singly or two or more kinds of additives in combination. 
     The sheet portion  11  is formed in a square shape in a plan view, but the shape is not particularly limited thereto. It is possible to adopt any shape in a plan view such as a triangular shape, an oblong shape, a rectangular shape, a trapezoidal shape, a rhombus shape, a polygonal shape such as a pentagonal shape or a hexagonal shape, a circular shape, an elliptical shape, and indefinite shapes that are not classified into the above-described shapes. It should be noted that, from the viewpoint of the improvement of expansion and contraction performance, weight reduction, or the like, the sheet portion  11  may have a notched portion, a punched hole, or the like at any place as long as the sheet portion  11  does not lose the characteristics as an acoustic metamaterial. 
     The thickness of the sheet portion  11  is not particularly limited as long as the maximum height of the sound-blocking sheet member falls within the scope of the present invention. Since it is possible to control a frequency band in which high sound-blocking performance is developed depending on the thickness of the sheet portion  11  (acoustic bandgap width or frequency position), it is possible to appropriately set the thickness of the sheet portion  11  such that the acoustic bandgap matches a desired sound-blocking frequency range. When thickness of the sheet portion  11  is thick, there is a tendency that the acoustic bandgap width becomes narrow and shifts toward the low frequency side. In addition, when the thickness of the sheet portion  11  is thin, there is a tendency that the acoustic bandgap width becomes wide and shifts toward the high frequency side. 
     From the viewpoint of sound-blocking performance, mechanical strength, flexibility, handleability, or the like, the thickness of the sheet portion  11  is preferably 10 μm or more, more preferably 50 μm or more, and still more preferably 100 μm or more. In addition, the thickness of the sheet portion  11  is preferably 2 mm or less, more preferably 1 mm or less, and still more preferably 500 μm or less. 
     From the viewpoint of sound-blocking performance, mechanical strength, flexibility, handleability, productivity, or the like, the sheet portion  11  has a Young&#39;s modulus of preferably 0.01 MPa or more and more preferably 0.1 MPa or more and has a Young&#39;s modulus of preferably 100 MPa or less and more preferably 10 MPa or less. 
     Here, the Young&#39;s modulus in the present specification means the ratio between a force (stress) acting per unit cross-sectional area and the deformation rate (strain) of a sample at the time of applying an external force in a uniaxial direction and means the value of the stored longitudinal elastic modulus at 25° C. and 10 Hz measured by the forced vibration non-resonant method of JIS K 6394: 2007 “Rubber, vulcanized or thermoplastic—Determination of dynamic properties”. 
     In addition, the sheet portion  11  preferably has a glass transition temperature of 0° C. or lower from the viewpoint of reducing the temperature dependence of the sound-blocking property at low temperatures. As the glass transition temperature of the sheet portion  11  lowers, the cold resistance is further enhanced, the temperature dependence of the elastic modulus near 0° C. becomes smaller, and there is a tendency that it becomes more difficult for the sound-blocking performance to depend on the ambient temperature. The glass transition temperature of the sheet  11  is more preferably −10° C. or lower, still more preferably −20° C. or lower, and particularly preferably −30° C. or lower. It should be noted that, in the present specification, the glass transition temperature of the sheet portion  11  means the peak temperature of the loss tangent in the above-described dynamic viscoelasticity measurement at a frequency of 10 Hz, particularly, the temperature dependence measurement. 
     [Resonance Portion] 
     The resonance portion  21  functions as a vibrator (resonator) that vibrates at a certain frequency when a sound wave is incident from a noise source. The resonance portion  21  of the present embodiment is formed of a composite structure including the base portion  22  and the weight portion  23  that is supported by the base portion  22  and has a larger mass than the base portion  22 . The resonance portion  21  effectively functions as a resonator having a resonance frequency that is determined by the mass of the weight portion  23  acting as a weight and the spring constant of the base portion  22  acting as a spring. 
     The array, number, size, and the like of the resonance portions  21  can be appropriately set depending on desired performance and are not particularly limited. The resonance portions  21  are disposed along the surface direction of at least one sheet surface  11   a  of the sheet portion  11 . For example, in the present embodiment, a plurality of the resonance portions  21  are disposed in a grid shape at equal intervals, but the array of the resonance portions  21  is not particularly limited thereto. For example, the plurality of resonance portions  21  may be disposed in, for example, a zigzag shape or may be randomly disposed. Since the sound-blocking mechanism by the sound-blocking sheet member  100  does not utilize Bragg scattering, which is utilized in so-called phononic crystals, the intervals between the resonance portions  21  may not be regularly and periodically disposed at all times. 
     In addition, the number of the resonance portions  21  installed per unit area is not particularly limited as long as the resonance portions  21  can be disposed so as not to interfere with each other by coming into contact with each other or the like. 
     The maximum number of the resonance portions  21  per unit area varies depending on the shape or the like of the resonance portion  21 . For example, in a case where the resonance portion  21  has a cylindrical shape, the height direction of the cylinder is installed parallel to the sheet normal direction, and the cross-sectional diameter of the cylinder is 1 cm, the maximum number is preferably 100 or less per 10 cm2. 
     For example, in a case where the resonance portion  21  has a cylindrical shape, the height direction of the cylinder is installed parallel to the sheet normal direction, and the cross-sectional diameter is 1 cm, the minimum number of the resonance portions  21  per unit area is preferably 2 or more, more preferably 10 or more, and still more preferably 50 or more per 10 cm2. When the number of the resonance portions  21  installed is equal to or more than the above-described preferable lower limit, there is a tendency that higher sound-blocking performance can be obtained. In addition, when the number of the resonance portions  21  installed is equal to or less than the above-described preferable upper limit, it becomes easy to reduce the weight of the entire sheet. 
     The maximum height of the resonance portion  21  in the normal direction from the sheet surface  11   a  of the sheet portion  11  can be appropriately set depending on desired performance and is not particularly limited. From the viewpoint of the easiness of molding and the improvement of productivity, the maximum height is preferably 10 μm or more, more preferably 100 μm or more, and still more preferably 1 mm or more. In addition, the maximum height is preferably 20 mm or less, more preferably 15 mm or less, still more preferably 10 mm or less, still more preferably 8 mm or less, far still more preferably 5 mm or less, and particularly preferably 3 mm or less. When the maximum height is set within the present range, there is an advantage from the viewpoint of productivity, for example, the easiness of peeling the sheet portion  11  from a mold MD. 
     In addition, the heights of all of the resonance portions  21  in the normal direction of the sheet portion  11  may not be the same and may be different. When the heights of the resonance portions are different, there is a case where an effect of expanding a frequency range in which sound-blocking performance appears can be obtained. 
     [Base Portion] 
     The base portion  22  has a substantially cylindrical outer shape. A plurality of the base portions  22  are provided in contact with the sheet surface  11   a  of the sheet portion  11 , and the weight portions  23  are each buried inside the base portions  22 . The outer shape of the base portion  22  is not particularly limited, and it is possible to adopt an any shape such as a triangular columnar shape, a rectangular columnar shape, a trapezoidal columnar shape, a polygonal columnar shape such as a pentagonal column or a hexagonal column, a cylindrical columnar shape, an elliptical columnar shape, a truncated pyramid shape, a truncated cone shape, a prismatic shape, a conical shape, a hollow tubular shape, a branched shape, or an indefinite shape that is not classified into the above-described shapes. In addition, it is also possible to form the base portion  22  in a columnar shape having at least one of a cross-sectional area and a cross-sectional shape that vary depending on the height position of the base portion  22 . 
     In addition, the shapes or heights of a plurality of the base portions  22  provided in contact with the sheet surface  11   a  may be identical or different. 
     The material of the base portion  22  is not particularly limited as long as the above-described required characteristics are satisfied. Examples thereof include resin materials and include at least one selected from the group consisting of a thermoset elastomer, a thermoplastic elastomer, a thermosetting resin, and a thermoplastic resin. 
     Examples of the thermoset elastomer and the thermoplastic elastomer include those exemplified in the section of the sheet. 
     Examples of the thermosetting resin include acrylic thermosetting resins, urethane-based thermosetting resins, silicone-based thermosetting resins, epoxy-based thermosetting resins, and the like. Examples of the thermoplastic resin include polyolefin-based thermoplastic resins, polyester-based thermoplastic resins, acrylic thermoplastic resins, urethane-based thermoplastic resins, polycarbonate-based thermoplastic resins, and the like. 
     Specific examples thereof include rubbers such as vulcanized rubber such as chemically crosslinked natural rubber or synthetic rubber, isoprene rubber, butadiene rubber, styrene-butadiene rubber, chloroprene rubber, nitrite rubber, polyisobutylene rubber, ethylene-propylene rubber, chlorosulfonated polyethylene rubber, acrylic rubber, fluororubber, epichlorohydrin rubber, polyester rubber, urethane rubber, silicone rubber, and modified bodies thereof; polymers such as polyacrylonitrile, polyethylene terephthalate, polybutylene terephthalate, polyvinyl chloride, polychlorotrifluoroethylene, polyethylene, polypropylene, polynorbornene, polyether ether ketone, polyphenylene sulfide, polyarylate, polycarbonate, polystyrene, epoxy resins, and oxazine resins; and the like, but are not particularly limited thereto. Among these additives, it is possible to use one kind of additive singly or two or more kinds of additives in combination. 
     In addition, the base portion  22  may be a porous body including pores (gas such as air) in the resin material. Furthermore, the base portion  22  may include a liquid material such as mineral oil, vegetable oil, or silicone oil. It should be noted that, in a case where the base portion  22  includes a liquid material, the liquid material is desirably contained in the resin material from the viewpoint of suppressing the outflow of the liquid material to the outside. 
     Among these, the material of the base portion  22  is preferably the same material as the sheet portion  11  and particularly preferably an elastomer. When the sheet portion  11  and the base portions  22  contain the same elastomer, the integral molding of the sheet portion  11  and the base portions  22  becomes easy, and the productivity is significantly enhanced. That is, one of particularly preferable aspects is an integrally molded product in which the sheet portion  11  and the resonance portions  21  (base portions  22 ) both contain at least one selected from the group consisting of a thermoset elastomer and a thermoplastic elastomer. 
     Specific examples of the elastomer 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 bodies thereof, polyacrylonitrile, polyethylene terephthalate, polybutylene terephthalate, polyvinyl chloride, polychlorotrifluoroethylene, polyethylene, polypropylene, polynorbornene, polyether ether ketone, polyphenylene sulfide, polyarylate, polycarbonate, polystyrene, epoxy resins, and oxazine resins, and the like, but are not particularly limited thereto. 
     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 bodies thereof are preferable, and silicone rubber, acrylic rubber, and modified bodies thereof are more preferable from the viewpoint of excellent heat resistance or cold resistance or the like. 
     It should be noted that it is also possible to produce the base portion  22  as a two-color molded product or a multi-color molded product made of two or more kinds of resin materials. In this case, when the same elastomer as the above-described sheet portion  11  is adopted for the base portions  22  on the side in contact with the sheet portion  11 , the integral molding of the sheet portion  11  and the base portions  22  becomes easy. 
     It should be noted that, in a case where the resonance portions  21  (base portions  22 ) having a circular cross-sectional shape are provided as in the present embodiment, in a cross section parallel to the sheet surface  11   a  of the sheet portion  11  at a height position of the resonance portion  21  (base portion  22 ) at which the total of the cross-sectional areas of the plurality of resonance portions  21  (base portions  22 ) is maximized, the diameter of the circle having the largest diameter among the circles (circular cross sections) that are included in the cross section is preferably 100 mm or less, more preferably 50 mm or less, and still more preferably 20 mm or less. In addition, the diameter of the circle having the smallest diameter is preferably 10 μm or more, more preferably 100 μm or more, and still more preferably 1 mm or more. When the diameters are set within the above preferable numerical ranges, it is possible to secure a predetermined number or more of the resonance portions  21  (base portions  22 ) that are installed on the sheet surface  11   a  of the sheet portion  11  and to obtain more favorable sound-blocking performance, and there is also a tendency that the easiness of molding and the productivity are further enhanced. 
     [Weight Portion] 
       FIG. 13  is a perspective view of the appearance of the weight portion  23 . 
     The weight portion  23  of the present embodiment has a through-hole (penetration portion)  124  with a circular cross section. The through-hole  124  penetrates the weight portion  23  in the vertical direction. The weight portion  23  is not particularly limited as long as the weight portion  23  has a larger mass than the above-described base portion  22 . As shown in  FIG. 13 , the weight portion  23  has, for example, an annular shape (doughnut shape), but may have a disk shape such as a washer or a hexagonal columnar shape such as a nut. 
     The shape of the weight portion  23  is not particularly limited, but is preferably a plate shape from the viewpoint of the adjustment of sound-blocking performance and thickness reduction. When the weight portion  23  has a plate shape, it becomes possible to place the center of gravity of the weight at a position away from the substrate compared with a case where the weight portion  23  is a sphere or the like, and there is a tendency that it is possible to increase the vibration moment of the resonance portion  21 . For example, in a case where the acoustic bandgap width is set to be constant, it becomes possible to thin the weight having a plate shape compared with a case where the weight portion  23  is a sphere or the like. On the other hand, in a case where the height of the weight portion  23  is set to be constant, it becomes possible for the weight having a plate shape to obtain a wide bandgap width compared with a case where the weight portion  23  is a sphere or the like. 
     In the present embodiment, the weight portion  23  is formed in a substantially circular shape in which the outer diameter of the weight portion  23  is smaller than the base portion  22  and is buried in the base portion  22  on the front end side of the resonance portion  21  (hereinafter, simply referred to as the front end side).  FIG. 14  is a perspective view of the appearance of the resonance portion  21  in which the weight portion  23  is buried in the base portion  22 , and  FIG. 15  is a partial cross-sectional view. 
     As shown in  FIG. 14  and  FIG. 15 , in the resonance portion  21 , the weight portion  23  is disposed on the front end side of the base portion  22 . The base portion  22  has a coating portion  125  that covers a part of the surface on the front end side of the weight portion  23  and an indented portion  26  provided by removing (penetrating) a part of the coating portion  125 . The indented portion  26  is provided coaxially with the through-hole  124  in a circular shape in a plan view. The diameter of the indented portion  26  is larger than the diameter of the through-hole  124  and smaller than the outer diameter of the weight portion  23 . Therefore, a part of the surface on the front end side of the weight portion  23  is exposed on the bottom surface of the indented portion  26 . 
     In addition, in the resonance portion  21 , a void  27  having a circular cross-sectional shape that is open on the bottom surface of the indented portion  26  and extends in the axial direction is provided. The void  27  is formed in the resin material of the base portion  22  made to fill the through-hole  124  in the weight portion  23 . The void  27  is coaxial with the indented portion  26 . In the present embodiment, a portion between the surface of the through-hole  124  and the void  27  is filled with the resin material. The depth of the void  27  is set to a length that does not allow the void  27  to reach the surface on the rear end side of the weight portion  23 . 
     As described above, since a configuration in which the weight portion  23  acting as the weight of the resonance portion  21  is supported by the base portion  22  that determines the spring constant is adopted, it is possible to easily control the resonance frequency of the resonance portion  21  by, for example, adjusting the spring constant through a change in the shape or material (elastic modulus or mass) of the base portion  22  or changing the mass of the weight portion  23 . Ordinarily, as the elastic modulus of the base portion  22  decreases, there is a tendency that the acoustic bandgap shifts toward the low frequency side. In addition, as the mass of the weight portion  23  increases, there is a tendency that the acoustic bandgap shifts toward the low frequency side. 
     In  FIG. 13 , the height hx of the weight portion  23  is not particularly limited, but is preferably 0.95 or less and more preferably 0.9 or less in a case where the height of the resonance portion is set to 1. In addition, the height hx is preferably 0.2 or more and more preferably 0.3 or more. When the height hx is within these ranges, there is a tendency that it is possible to obtain a wide bandgap width while suppressing the height of the sound-blocking sheet member. 
     The outer diameter r 1  of the weight portion  23  is not particularly limited. In a case where the resonance portion  21  has a circular cross-sectional shape, there is a tendency that the sound-blocking performance is excellent when the outer diameter r 1  is approximately the diameter of the circular cross-sectional shape. While not particularly limited, the maximum value of the radius r 1  is preferably 100 mm or less, more preferably 50 mm or less, and still more preferably 20 mm or less. In addition, the minimum value of the radius r 1  is preferably 10 μm or more, more preferably 100 μm or more, and still more preferably 1 mm or more. When the maximum value and the minimum value are within the above-described preferable numerical ranges, it is possible to obtain favorable sound-blocking performance, and there is a tendency that the easiness of molding and the productivity are further enhanced. In the weight portion  23  of the present embodiment, since a part of the through-hole  124  is filled with the resin material or the like, and a part on the front end side is coated with the coating portion  125 , it is possible to suppress the weight portion  23  dropping from the base portion  22  or breaking even when partially exposed. On the inner peripheral surface of the through-hole  124  in the weight portion  23 , there may be bellows unevenness or a spiral notch groove, and, in that case, the resin enters the groove, whereby it is possible to further suppress the dropping of the weight portion  23 . 
     The inner diameter r 2  of the weight portion  23  is not particularly limited. The maximum value of the inner diameter r 2  is not particularly limited as long as the maximum value of the inner diameter r 2  is smaller than the outer diameter r 1 , but the maximum value of the inner diameter r 2  is preferably 90 mm or less, more preferably 40 mm or less, still more preferably 20 mm or less, and particularly preferably 10 mm or less. In addition, the minimum value of the inner diameter r 2  is preferably 2 μm or more, more preferably 50 μm or more, and still more preferably 80 μm or more. When the maximum value and the minimum value are within the above-described preferable numerical ranges, there is a tendency that it becomes easy to fill the through-hole  124  with the resin material or the like. 
     In addition, the ratio between the outer diameter r 1  and the inner diameter r 2  of the weight portion  23  is not particularly limited. 
     The material that configures the weight portion  23  may be appropriately selected in consideration of mass, cost, or the like, and the kind thereof is not particularly limited. From the viewpoint of the size reduction and the improvement of sound-blocking performance of the sound-blocking sheet member  100  and the sound-blocking structure  200 , the material that configures the weight portion  23  is preferably a material having a high specific gravity. 
     Specific examples thereof include metals or alloys such as aluminum, stainless steel, iron, tungsten, gold, silver, copper, lead, zinc, and brass; inorganic glass such as soda glass, quartz glass, and lead glass; composites containing the powder of these metals or alloys, these inorganic glasses, or the like in the resin material of the above-described base portion  22 ; and the like, but the material is not particularly limited thereto. The material, mass, and specific gravity of the weight portion  23  may be determined such that the sound-blocking sheet member  100  and the sound-blocking structure  200  acoustic bandgap matches a desired sound-blocking frequency range. 
     Among these, at least one selected from the group consisting of metal, alloy, and inorganic glass is preferable from the viewpoint of a low cost, a high specific gravity, or the like. It should be noted that the specific gravity means the ratio between the mass of a material and the mass of an equal volume of pure water at a pressure of 1013.25 hPa and 4° C., and, in the present specification, a value measured by JIS K 0061 “Test methods for density and relative density of chemical products” is used. 
     On the surface (also including the through-hole) of the weight portion  23 , a surface treatment may be performed in order to enhance process suitability or member strength. For example, it is conceivable to perform a chemical treatment with a solvent or the like for enhancing the sticking property to the base portion  22  or to perform a physical treatment that increases the member strength by providing a protrusion and a recess on the surface, but the method for the surface treatment is not particularly limited. 
     In the present embodiment, the weight portion  23  is buried in the base portion  22  at the front end side of the resonance portion  21 , but the installation position thereof is not particularly limited thereto. While depending on the shapes, masses, elastic moduli, and the like of the base portion  22  and the weight portion  23 , the base portion  22  and the weight portion  23  are preferably disposed such that the center of gravity (mass center) of the resonance portion  21  is positioned at least on the front end side of the center of the resonance portion  21  in the height direction from the viewpoint of the thickness reduction, weight reduction, or sound-blocking performance improvement of the sound-blocking sheet member  100 . Typically, the weight portion  23  may be offset-disposed on the front end side of the center of the resonance portion  21  in the height direction. 
     It should be noted that the weight portion  23  may be buried completely or only partially in the base portion  22  or may be provided on the base portion  22  without being buried in the base portion  22 . (The detail will be described below) In addition, in a case where the base portion  22  has a branched structure, from the viewpoint of the weight reduction or sound-blocking performance improvement of the sound-blocking sheet member, the weight portion  23  is preferably disposed so as to be positioned on the front end side of the center of a branch portion provided from a branch point in a case where the weight portion is provided at the branch portion. 
     Furthermore, the shapes and heights of the plurality of weight portions  23  included in the sound-blocking sheet member may be identical or different. 
     It should be noted that, while the plurality of resonance portions  21  are provided on the sheet surface  11   a  of the sheet  11 , the material that configures the resonance portion  21 , the array, shape, and size of the resonance portion  21 , the installation direction of the resonance portion  21 , and the like may not be identical at all times in all of the plurality of resonance portions  21 . When a plurality of kinds of the resonance portions  21  that are different in at least one of the above-described properties are installed, it is possible to expand the frequency range in which high sound-blocking performance appears. 
     [Support] 
     The sound-blocking sheet member  100  of the present invention can be appropriately installed in accordance to an environment in which the sound-blocking performance is developed. For example, the sound-blocking sheet member  100  may be installed directly on a device, a structure, or the like. Between the sound-blocking sheet member  100  and the device, the structure, or the like, an adhesive layer or the like may be provided. In addition, the sound-blocking sheet member  100  may be used in a form of being supported by the support  51 . The support may support the sound-blocking sheet member  100  at the time of blocking sound using the sound-blocking sheet member  100  of the present invention, and the sound-blocking sheet member may not be supported by the support  51  during manufacturing, storage, or the like. 
     The support  51  may be provided in contact with at least one surface of the sheet portion  11  of the sound-blocking sheet member  100  and may be provided on at least one of the sheet surface  11   a  on which the resonance portions  21  are provided in contact and the other sheet surface  11   b.    
     In the present embodiment, the support  51  is provided on the sheet surface  11   b  side on the rear side of the sheet portion  11 . The material that configures the support  51  is not particularly limited as long as the material is capable of supporting the sheet portion  11 , but is preferably a material having higher stiffness than the sheet portion  11  from the viewpoint of enhancing the sound-blocking performance. Specifically, the support  51  preferably has a Young&#39;s modulus of 1 GPa or more and more preferably has a Young&#39;s modulus of 1.5 GPa or more. The upper limit is not particularly limited and is, for example, 1000 GPa or less. 
     In addition, in a case where the sound-blocking sheet member  100  is installed directly on a device, a structure, or the like, the surface on which the sound-blocking sheet member  100  is installed preferably has the same stiffness as the support  51  from the viewpoint of supporting the sheet portion  11 , the viewpoint of enhancing the sound-blocking performance, or the like. 
     The material that configures the support  51  is not particularly limited. Examples thereof include a photocurable resin sheet, a thermosetting resin sheet, a thermoplastic resin sheet, a metal plate, an alloy plate, and the like. Examples of the photocurable resin sheet, the thermosetting resin sheet, and the thermoplastic resin sheet include sheets and the like for which the photocurable resin, the thermosetting resin, and the thermoplastic resin exemplified in the section of the base portion are used. 
     Specific examples of the material that configures the support  51  include, for example, polyester resins such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, and polybutylene succinate, poly (meth)acrylate resins such as polymethylmethacrylate, polycarbonate resins such as polycarbonate containing isosorbide as a main raw material, polyolefin resins such as polyethylene, polypropylene, and polynorbornene, organic materials such as vinyl chloride resins, polyacrylonitrile, polyvinylidene chloride, polyether sulfone, polyphenylene sulfide, polyarylate, polyamide, polyimide, triacetyl cellulose, polystyrene, epoxy resins, and oxazine resins, composite materials containing metal such as aluminum, stainless steel, iron, copper, zinc, or brass, inorganic glass, inorganic particles, or a fiber in the organic material, and the like. 
     Among these, the support is preferably at least one kind 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 viewpoint of sound-blocking property, stiffness, moldability, cost, and the like. Here, the thickness of the support  51  is not particularly limited, but is, usually, preferably 0.05 mm or more and 0.5 mm or less from the viewpoint of sound-blocking performance, stiffness, moldability, weight reduction, cost, and the like. 
     Furthermore, the support  51  may have a coating layer provided on the surface of the support  51  from the viewpoint of light permeability, a sticking property to the sound-blocking sheet member, or the like. 
     It should be noted that the shape of the support  51  can be appropriately set depending on the installation surface of the sound-blocking structure  200  and is not particularly limited. For example, the shape of the support  51  may be a flat sheet shape, a curved sheet shape, or a special shape processed so as to have a curved surface portion, a folded portion, or the like. Furthermore, from the viewpoint of weight reduction or the like, a notch, a punched portion, or the like may be provided at any place in the support  51 . 
     In addition, the surface density (mass per unit area) of the support  51  can be appropriately set depending on desired performance and is not particularly limited. From the viewpoint of enhancing the effect of the present invention, the surface density of the support  51  is preferably 80% or less, more preferably 30% or less, and still more preferably 10% or less of the surface density of the sound-blocking sheet member  100 . 
     [Manufacturing Method] 
     The method for manufacturing a sound-blocking sheet member and a sound-blocking structure of the present invention may include the following steps (1) to (4). 
     (1) A step of preparing a mold having a plurality of cavities. 
     (2) A step of disposing weight portions in a plurality of cavities provided in the mold. 
     (3) A step of pouring a resin material into the cavities. 
     (4) A step of curing the poured resin material. 
     (5) A step of peeling the obtained cured product from the mold. 
     After the step (4) or the step (5), a step of providing a support in a shape of the obtained cured product may also be provided. The shape of a cavity used in each manufacturing method is not particularly limited, and, for example, as the shape of the bottom, it is possible to appropriately select a hemispherical shape, a planar shape, a protrusion shape, a recess shape, or the like. 
     From the viewpoint of enhancing the productivity and the economic efficiency, a method in which the sound-blocking sheet member  100  is integrally molded by mold molding, casting mold molding, or the like is preferable. As an example thereof, exemplified is a method in which an integrally molded product of the sheet portion  11  and the resonance portions  21  is molded using a mold or a casting mold with cavities having shapes corresponding to the integrally molded product of the sheet portion  11  and the resonance portions  21 . As such an integral molding method, known are a variety of well-known methods such as a press molding method, a compression molding method, transfer molding, a casting molding method, an extrusion molding method, and an injection molding method, and the kind thereof is not particularly limited. It should be noted that, as long as the raw material of each component is, for example, a resin material having rubber elasticity, it is possible to pour the raw material into the cavities in a form of a liquid-phase precursor or a heated melt. In addition, as long as the raw material is metal, an alloy, or inorganic glass, it is possible to dispose (insert) the raw material in advance at a predetermined position in the cavity. 
     The resin material is not particularly limited. Examples thereof include a sheet that is the sound-blocking sheet member of the present invention, the materials exemplified in the sections of the base portion and the like, the raw materials and intermediates thereof, and the like. 
     Subsequently, the method for manufacturing the sound-blocking sheet member  100  will be described with reference to  FIG. 16  to  FIG. 20 . Here, a configuration in which the sound-blocking sheet member  100  is manufactured by transfer molding using a mold will be described as an example. 
       FIG. 16  is a cross-sectional view showing the mold MD. 
     The mold MD includes upper molds M 11  and M 12  and lower molds M 21  and M 22 . A press hot plate  161  is integrally fixed to the upper side of the upper mold M 12 . A press hot plate  62  is integrally fixed to the lower side of the lower mold M 22 . When the upper mold M 11  and the lower mold M 21  are joined, a space for molding the sound-blocking sheet member  100  is formed. 
     It should be noted that  FIG. 16  to  FIG. 44  show six resonance portions  21  molded in a row in order to facilitate understanding, but the number of the resonance portions  21  in a row is not limited to six and can be set to any number. In addition, each dimension of the component of the sound-blocking sheet member  100  including the resonance portion  21  and each dimension of the mold MD corresponding to the component are mapped in consideration of a dimensional change accompanied by, for example, a temperature change of the resin material such that the sound-blocking sheet member  100  having desired dimensions is molded after the steps (3) to (5); however, in the following description, the mapping of the dimensions will not be described. 
     The lower mold M 21  and the lower mold M 22  are relatively movable in the vertical direction such that the lower mold M 21  is capable of moving apart or close to the lower mold M 22  in a state of being disposed on the upper side. The lower mold M 21  has a recessed portion  11 M that corresponds to the sheet portion  11  formed on an upper surface M 21   a .  FIG. 17  is a partial detailed view of a cavity CV, which is a space in which the resonance portion  21  is to be molded. 
     As shown in  FIG. 17 , in the lower mold M 21 , a recessed portion  22 M in which the base portion  22  is to be molded is formed so as to penetrate the lower mold M 21  in the vertical direction. The lower mold M 22  has an upper surface  22 Ma forming the bottom portion of the cavity CV, a core portion (step portion)  26 M and a core portion (projection portion)  27 M that protrude from the upper surface  22 Ma toward the recessed portion  22 M. 
     The core portion  26 M is a portion for molding the indented portion  26  in the resonance portion  21  and is formed in a cylindrical shape. The diameter of the core portion  26 M is formed to be larger than the through-hole  124  in the weight portion  23 . The height of the core portion  26 M corresponds to the thickness of the coating portion  125  in the base portion  22 . The core portion  26 M protrudes to a height lower than the core portion  27 M. The core portion  27 M is a portion for forming the void  27  in the resonance portion  21  and is formed in a cylindrical shape. The diameter of the core portion  27 M is formed to be smaller than the through-hole  124  in the weight portion  23 . The height of the core portion  27 M is formed to be smaller than the thickness of the weight portion  23 . 
     It should be noted that, in addition to a definition in which the core portion  26 M having a larger outer diameter than the core portion  27 M protrudes from the upper surface  22 Ma and the core portion  27 M having a smaller outer diameter than the core portion  26 M protrudes from the front end surface of the core portion  26 M from the front end surface of the core portion  26 M, a definition in which the core portion  27 M having a smaller outer diameter than the core portion  26 M protrudes from the upper surface  22 Ma and the ring-shaped core portion  26 M having a larger outer diameter than the core portion  27 M protrudes from the upper surface  22 Ma in a state of being in contact with the outer peripheral surface of the core portion  27 M is possible. 
     The maximum value of the gap in the radial direction (a surface direction of the recessed portion  11 M in which the recessed portions  22 M and the core portions  26 M and  27 M are arrayed; the surface direction of the sheet portion  11  (a direction perpendicular to an axial line when the center of the resonance portion  21  in the radial direction is defined as the axial line) between the core portion  27 M and the through-hole  124  is formed to be smaller than the minimum value of the gap in the radial direction between the recessed portion  22 M and the weight portion  23 . 
     The cavity CV in which the resonance portion  21  is to be molded is a space including the recessed portion  22 M surrounded by the upper surface  22 Ma, the core portion  26 M, the core portion  27 M, and a lower surface M 11   a  of the upper mold M 11  (refer to  FIG. 16  and  FIG. 17 ). 
     The upper mold M 11  and the upper mold M 12  are relatively movable in the vertical direction such that the upper mold M 11  is capable of moving apart or close to the upper mold M 12  in a state of being disposed on the upper side (refer to  FIG. 18 ). The upper mold M 11  has an indentation (pot) M 111  and a plurality of through-holes M 112  that are open in the indentation M 111  and penetrate the upper mold M 11  in the vertical direction on an upper surface M 11   b . The through-holes M 112  are disposed at positions facing the recessed portion  11 M. 
     The upper mold M 12  has a projection portion (plunger) M 121  protruding from a lower surface M 12   a . The projection portion M 121  is inserted into the indentation M 111  of the upper mold M 11  when the upper surface M 11   b  of the upper mold M 11  and the lower surface M 12   a  of the upper mold M 12  come into contact with each other. 
     Next, a method for manufacturing the sound-blocking sheet member  100  using the above-described mold MD will be described. In the mold MD prepared in the step (1), as shown in  FIG. 16 , formed is a state in which the upper mold M 11  and the upper mold M 12  are in contact with each other, the lower mold M 21  and the lower mold M 22  are in contact with each other, and the upper mold M 11  and the lower mold M 21  are spaced apart from each other. 
     Subsequently, in the step (2), the weight portions  23  are each disposed in the plurality of cavities CV from a gap in which the upper mold M 11  and the lower mold M 21  are spaced apart. Each weight portion  23  is placed on the core portion  26 M in a state in which the core portion  27 M is inserted into the through-hole  124 . The weight portion  23  is placed on the core portion  26 M, whereby a gap is formed between the weight portion  23  and the upper surface  22 Ma. 
     Here, since the maximum value of the gap in the radial direction between the core portion  27 M and the through-hole  124  is formed to be smaller than the minimum value of the gap in the radial direction between the recessed portion  22 M and the weight portion  23 , even in a case where the weight portion  23  is unevenly placed with respect to the core portion  27 M, it is possible to suppress the outer peripheral surface of the weight portion  23  coming into contact with the inner peripheral surface of the recessed portion  22 M (that is, the lower mold M 21 ). 
     Subsequently, in the step (3), a resin material (for example, a thermosetting resin) is poured into the cavities CV. 
     Specifically, first, as shown in  FIG. 18 , in a state in which the lower mold M 21  and the lower mold M 22  are in contact with each other and the upper mold M 11  and the lower mold M 21  are in contact with each other, the upper mold M 11  and the upper mold M 12  are spaced apart. Next, the resin material in a semi-cured state is supplied to the indentation M 111  of the upper mold M 11 . 
     Subsequently, as shown in  FIG. 19 , the projection portion M 121  of the upper mold M 12  is inserted into the indentation M 111  of the upper mold M 11  to compress the resin material. The compressed resin material is poured into the recessed portion  11 M and the cavities CV through the through-holes M 112 . The insides of the recessed portions  22 M (including the insides of the through-holes  124 ) excluding the weight portions  23 , the core portions  26 M and  27 M are filled with the resin material that has been poured into the cavities CV. 
     Here, when the resin material is poured into the cavities CV, there is a possibility that the weight portion  23  may move due to the flow of the resin material, but the core portion  27 M is inserted into the through-hole  124  to regulate the position in the radial direction, and thus the weight portion  23  becoming significantly uneven in the cavity CV is suppressed. Particularly, since the maximum value of the gap in the radial direction between the core portion  27 M and the through-hole  124  is formed to be smaller than the minimum value of the gap in the radial direction between the recessed portion  22 M and the weight portion  23 , it is possible to suppress the outer peripheral surface of the weight portion  23  coming into contact with the inner peripheral surface of the recessed portion  22 M (that is, the lower mold M 21 ), which prevents a portion between the outer peripheral surface of the weight portion  23  and the inner peripheral surface of the recessed portion  22 M from being filled with the resin material and causes the outer peripheral surface of the weight portion  23  to be exposed. 
     Subsequently, in the step (4), the resin material made to fill the cavities CV is cured by being heated with the press hot plates  161  and  62  for a certain period of time. Therefore, the sound-blocking sheet member  100  is molded in the inside between the upper mold M 11  and the lower mold M 21 . 
     Subsequently, in the step (5), the obtained cured product is peeled from the mold MD. 
     Specifically, as shown in  FIG. 20 , first, the upper mold M 11  and the lower mold M 21  are spaced apart, thereby separating the cured products caused to fill the through-holes M 112  and the sound-blocking sheet member  100  (sheet portion  11 ). Next, the lower mold M 21  and the lower mold M 22  are spaced apart, thereby releasing the core portions  27 M from the through-holes  124  in the weight portions  23 . Therefore, the sound-blocking sheet member  100 , which is a cured product, is supported by the lower mold M 21  from below. In addition, the cured product is peeled from the upper surface side of the lower mold M 21 , thereby obtaining the sound-blocking sheet member  100 . 
     It should be noted that, as the above-described molding, transfer molding has been exemplified, but the molding may be press molding (compression molding) in which the raw material is directly charged on the lower mold M 21  and pressed with the upper mold M 11 . In addition, in the case of using casting molding, in the step, the upper mold is not necessarily required, and the liquid-phase raw material is poured by the force of gravity or the like. In addition, in the case of using injection molding, in the step, the resin in a molten state or in a liquid state is made to fill the mold with a plunger or a screw after the mold is closed. 
     In addition, in the above-described embodiment, a configuration in which the resin material is cured by supplying heat using the press hot plates  161  and  62  has been exemplified, but a heat source such as a heater may be directly disposed in the upper molds M 11  and M 12  and the lower molds M 21  and M 22 . In addition, in the case of press molding or injection molding using a thermoplastic resin, a cooling pipe or the like for promoting the solidification of the resin may be disposed in or around the mold. 
     In addition, in the above-described mold MD, a configuration in which the lower mold M 21  having the recessed portions  22 M and the lower mold M 22  having the core portions  26 M and  27 M are divided has been exemplified, but this is a configuration for easily releasing the sound-blocking sheet member  100 , and the lower mold M 21  and the lower mold M 22  may be integrated in the configuration. 
     Furthermore, in the above-described embodiment, a configuration in which the resin material in a semi-cured state is supplied to the indentation M 111  of the upper mold M 11  and compressed has been exemplified, but the configuration is not limited to this configuration. For example, a solid material of the resin may be inserted into the indentation M 111  of the upper mold M 11 , and the solid material may be pushed into the cavities CV with a press plate (press mold) that is inserted into the indentation M 111 . 
     As described above, in the sound-blocking sheet member  100  and the manufacturing method therefor of the present embodiment, since the resin is poured into the cavities CV in a state in which the core portions  27 M of the lower mold M 22  are inserted into the through-holes  124  in the weight portions  23 , it is possible to suppress the positions of the weight portions  23  becoming significantly uneven with respect to the base portions  22 . Therefore, it is possible to suppress the outer peripheral surface of the weight portion  23  being exposed and released from the base portion  22  or being rusted. 
     Furthermore, in the sound-blocking sheet member  100  and the manufacturing method therefor of the present embodiment, since the core portion  26 M comes into contact with a part of the front end of the weight portion  23  from below, it becomes possible to provide the coating portion  125  that coats the front end side of the weight portion  23  at the front end of the resonance portion  21 , and it is possible to suppress the weight portion  23  being released from the base portion  22  or the weight portion  23  being rusted with the coating portion  125 . 
     It should be noted that, in the above-described embodiment, a configuration in which the portion between the void  27  and the inner peripheral surface of the through-hole  124  in the weight portion  23  (that is, the portion between the core portion  27 M and the inner peripheral surface of the through-hole  124  during molding) is filled with the resin material has been exemplified, but the configuration is not limited to this configuration. For example, the outer peripheral surface of the core portion  27 M may be fitted into the through-hole  124  in the configuration, and the outer peripheral surface of the void  27  may be formed of the inner peripheral surface of the through-hole  124  in the configuration. In the case of adopting this configuration, it becomes possible to dispose the weight portion  23  coaxially with respect to the base portion  22  without becoming uneven. Therefore, it is possible to stabilize the sound-blocking characteristics in the sound-blocking sheet member  100 . 
     [Fourth Embodiment of Sound-Blocking Sheet Member and Manufacturing Method] 
     Subsequently, a fourth embodiment of the sound-blocking sheet member  100  and a manufacturing method therefor will be described with reference to  FIG. 21  and  FIG. 22 . 
     In these drawings, the same element as the component of the third embodiment shown in  FIG. 11  to  FIG. 20  will be given the same reference sign and will not be described again. In addition, in the fourth embodiment, the configuration of a resonance portion is different from that in the third embodiment, and thus the resonance portion will be described below. 
       FIG. 21  is a partial cross-sectional view of the resonance portion  21  in which the weight portion  23  is buried in the base portion  22 .  FIG. 22  is a partial detailed view of the cavity CV, which is a space in which the resonance portion  21  is to be molded. 
     As shown in  FIG. 21 , a recessed portion  24 A that is coaxially indented with the outer peripheral surface of the weight portion  23  is provided on the surface on the front end side of the weight portion  23 . As an example, the recessed portion  24 A is circular in a plan view. 
     The base portion  22  has a void  27 A that is open on the surface on the front end side and on the bottom surface of the recessed portion  24 A and extends in the vertical direction. The void  27 A opens on the bottom surface of the recessed portion  24 A, whereby a part of the weight portion  23  is exposed on the front end side through the void  27 A. 
     As shown in  FIG. 22 , a cylindrical core portion  27 M for forming the void  27 A protrudes from the lower mold M 22  in the mold MD. The diameter of the core portion  27 M is smaller than the diameter of the recessed portion  24 A. The height (protrusion amount) of the core portion  27 M is set to a value at which the coating portion  125  shown in  FIG. 21  is molded in a predetermined thickness between the weight portion  23  and the upper surface  22 Ma when the front end surface supports the bottom surface of the recessed portion  24 A from below. 
     The weight portion  23  is placed in a state in which the core portion  27 M in the mold MD having the above-described configuration is inserted into the recessed portion  24 A, and then the above-described resin material is poured into the cavity CV and cured, whereby the resonance portion  21  shown in  FIG. 21  is molded. 
     The resonance portion  21  of the present embodiment is capable not only of obtaining the same action and effect as the resonance portion  21  described in the third embodiment, but also of decreasing the diameter of the void  27 A and increasing the area of the coating portion  125 . Therefore, it is possible to further suppress the weight portion  23  being released from the base portion  22  or the weight portion  23  being rusted. 
     [Fifth Embodiment of Sound-Blocking Sheet Member and Manufacturing Method] 
     Subsequently, a fifth embodiment of the sound-blocking sheet member  100  and a manufacturing method therefor will be described with reference to  FIG. 23  to  FIG. 27 . 
     In these drawings, the same element as the component of the third and fourth embodiments shown in  FIG. 11  to  FIG. 22  will be given the same reference sign and will not be described again. 
       FIG. 23  and  FIG. 24  are cross-sectional views showing a mold MD according to the fifth embodiment. 
     As shown in  FIG. 23 , in the lower mold M 22 , a hollow portion  63  extending in the surface direction is provided in the middle of the thickness direction (vertical direction). In the hollow portion  63 , a moving portion  64  extending in the surface direction is provided. The moving portion  64  is movable in the vertical direction by driving with a driving device  65  between an upper end position (position shown in  FIG. 23 ) at which the moving portion  64  comes into contact with an upper surface  63   a  facing the hollow portion  63  and a lower end position shown in  FIG. 24  at which the moving portion  64  comes into contact with a lower surface  63   b  facing the hollow portion  63 . 
       FIG. 25  and  FIG. 26  are partial detailed views of the cavity CV, which is a space in which the resonance portion  21  is to be molded.  FIG. 25  and  FIG. 26  show a state in which the resin material has been poured into the cavity CV. In addition, in  FIG. 25  and  FIG. 26 , the recessed portion  11 M and the upper mold M 11  are not shown. 
     The core portion  27 M of the present embodiment extends in the vertical direction, is fixed to the moving portion  64  at the lower end, and penetrates the lower mold M 22 . When the moving portion  64  is at the upper end position, the core portion  27 M supports the bottom surface of the recessed portion  24 A from below at a position in the vertical direction at which the coating portion  125  is to be formed in a predetermined thickness between the weight portion  23  and the upper surface  22 Ma as shown in  FIG. 25 . 
     In addition, when the moving portion  64  is at the lower end position, the core portion  27 M becomes flush with the upper surface  22 Ma as shown in  FIG. 26 . 
     In the mold MD having the above-described configuration, the moving portion  64  is moved to the upper end position by driving with the driving device  65 , and then the weight portion  23  is placed in a state in which the core portion  27 M is inserted into the recessed portion  24 A. After that, the above-described resin material is poured into the cavity CV. In addition, before the resin material reaches the periphery of the core portion  27 M and the resin material is completely cured, the core portion  27 M is moved to the lower end position together with the moving portion  64  by driving with the driving device  65  to make the front end surface of the core portion  27 M flush with the upper surface  22 Ma. 
     The resin material is poured into the cavity CV, whereby the resin material before curing enters the region in the cavity CV in which the core portion  27 M was provided due to the movement of the core portion  27 M. 
     As a result, as shown in  FIG. 26 , the resonance portion  21  in which the front end side of the weight portion  23  is fully coated with the resin material is obtained. 
     After that, once the resin material is cured, the moving portion  64  is moved to the upper end position again by driving with the driving device  65 . Therefore, as shown in  FIG. 27 , the front ends of the core portions  27 M pushes out the end portions of the resonance portions  21  from below, and the sound-blocking sheet member  100  is released from the lower mold M 21 . 
     As described above, in the present embodiment, not only can the same action and effect as in the third and fourth embodiments be obtained, but it also becomes possible to coat the entire front end side of the weight portion  23  with the resin material while regulating the position in the surface direction of the weight portion  23  in the middle of molding by moving the core portion  27 M during molding. Furthermore, in the present embodiment, the core portions  27 M are moved to the upper end position after the curing of the resin material, whereby it becomes possible to easily release the sound-blocking sheet member  100  from the lower mold M 21 , the productivity improves, and additionally, it is also possible to reduce a defect that is generated during mold release. In addition, the weight portion  23  may have a through-hole as in the third, sixth, seventh, and eighth embodiments, and, in that case, the core portions  26 M and  27 M are fixed to the moving portion  64 , and the upper surface of the core portion  26 M becomes flush with the upper surface  22 Ma when the moving portion  64  is at the lower end. 
     [Sixth Embodiment of Sound-Blocking Sheet Member and Manufacturing Method] 
     Subsequently, a sixth embodiment of the sound-blocking sheet member  100  and a manufacturing method therefor will be described with reference to  FIG. 28  to  FIG. 30 . In these drawings, the same element as the component of the third embodiment shown in  FIG. 11  to  FIG. 20  will be given the same reference sign and will not be described again. 
       FIG. 28  is a plan view of the resonance portion  21 .  FIG. 29  is a cross-sectional view taken along the line A-A in  FIG. 28 .  FIG. 30  is a partial detailed view of the cavity CV, which is a space in which the resonance portion  21  is to be molded. 
     In the third embodiment, a configuration in which the indented portion  26  provided in the resonance portion  21  has a circular shape in a plan view has been exemplified; however, in the present embodiment, as shown in  FIG. 28 , a plurality of indented portions provided at intervals in the circumferential direction are formed. Specifically, as shown in  FIG. 28  and  FIG. 29 , the indented portions  26  extend in the radial direction from the void  27  as the center. A plurality of the indented portions  26  (here, three at 120° intervals) are provided at intervals in the circumferential direction around the void  27 . The position of the outer side of the indented portion  26  in the radial direction is outside the inner peripheral surface of the through-hole  124  and inside the outer peripheral surface of the weight portion  23 . 
     As shown in  FIG. 30 , in the mold MD for molding the resonance portion  21 , the core portions  26 M extend in the radial direction from the core portion  27 M as the center. In addition, a plurality of the core portions  26 M (here, three at 120° intervals) are provided at intervals in the circumferential direction around the core portion  27 M. The position of the outer side of the core portion  26 M in the radial direction is outside the inner peripheral surface of the through-hole  124  and inside the outer peripheral surface of the weight portion  23 . 
     With the resonance portion  21  molded in the mold MD having the above-described configuration, not only can the same action and effect as in the third embodiment be obtained, but it also becomes possible to further suppress the weight portion  23  being released from the base portion  22  or being rusted since the coating portion  125  is formed even between the indented portions  26  in the circumferential direction. 
     [Seventh Embodiment of Sound-Blocking Sheet Member and Manufacturing Method] 
     Subsequently, a seventh embodiment of the sound-blocking sheet member  100  and a manufacturing method therefor will be described with reference to  FIG. 31  to  FIG. 33 . 
     In these drawings, the same element as the component of the sixth embodiment shown in  FIG. 28  to  FIG. 30  will be given the same reference sign and will not be described again. 
     In the sixth embodiment, a configuration in which the indented portions  26  extending in the radial direction are provided at intervals in the circumferential direction around the void  27  has been exemplified; however, in the present embodiment, dot-shaped indented portions  26  disposed apart from the void  27  are provided. 
       FIG. 31  is a plan view of the resonance portion  21 .  FIG. 32  is a cross-sectional view taken along the line B-B in  FIG. 31 .  FIG. 33  is a partial detailed view of the cavity CV, which is a space in which the resonance portion  21  is molded. 
     As shown in  FIG. 31  and  FIG. 32 , the indented portions  26  have a circular shape with a diameter smaller than the diameter of the void  27  in a plan view and are disposed apart from the void  27 . A plurality of the indented portions  26  (here, three at 120° intervals) are provided at intervals in the circumferential direction around the void  27 . The position of each indented portion  26  in the radial direction from the void  27  as the center is outside the inner peripheral surface of the through-hole  124  and inside the outer peripheral surface of the weight portion  23 . The indented portions  26  penetrate the coating portion  125  in the vertical direction. 
     As shown in  FIG. 33 , in the mold MD for molding the resonance portion  21 , the core portions  26 M are disposed apart from the core portion  27 M. In addition, a plurality of the core portions  26 M (here, three at 120° intervals) are provided at intervals in the circumferential direction around the core portion  27 M. The position of each core portion  26 M in the radial direction from the core portion  27 M as the center is outside the inner peripheral surface of the through-hole  124  and inside the outer peripheral surface of the weight portion  23 . 
     With the resonance portion  21  molded in the mold MD having the above-described configuration, not only can the same action and effect as in the sixth embodiment be obtained, but it also becomes possible to further suppress the weight portion  23  being released from the base portion  22  or being rusted since the coating portion  125  is formed even between the indented portion  26  and the void  27  in the radial direction. 
     [Eighth Embodiment of Sound-Blocking Sheet Member and Manufacturing Method] 
     Subsequently, an eighth embodiment of the sound-blocking sheet member  100  and a manufacturing method therefor will be described with reference to  FIG. 34  to  FIG. 37 . 
     In these drawings, the same element as the component of the sixth embodiment shown in  FIG. 28  to  FIG. 30  will be given the same reference sign and will not be described again. 
     In the sixth embodiment, a configuration in which the core portion  26 M having a surface parallel to the surface on the front end side of the weight portion  23  forms a gap corresponding to the thickness of the coating portion  125  between the weight portion  23  and the upper surface  22 Ma has been exemplified; however, in the present embodiment, a configuration in which a core portion  28 M that comes into contact with the weight portion  23  at a side surface (inclination portion) that inclines in a direction extending downward as the core portion  28 M runs toward the outer side in the radial direction from the center of the resonance portion  21  is provided will be described. 
       FIG. 34  is a plan view of the resonance portion  21 .  FIG. 35  is a cross-sectional view taken along the line C-C in  FIG. 34 .  FIG. 36  is a partial detailed view of the cavity CV, which is a space in which the resonance portion  21  is to be molded. 
     As shown in  FIG. 34 , indented portions  28  extend in the radial direction from the void  27  as the center. A plurality of the indented portions  28  (here, three at 120° intervals) are provided at intervals in the circumferential direction around the void  27 . The position of the innermost side of the indented portion  28  on the inner side in the radial direction is outside the outer peripheral surface of the void  27  and inside the inner peripheral surface of the through-hole  124 . The position of the outer side of the indented portion  28  in the radial direction is outside the inner peripheral surface of the through-hole  124  and inside the outer peripheral surface of the weight portion  23 . 
     As shown in  FIG. 35 , the position in the vertical direction of the bottom portion of the indented portion  28  on the inner side in the radial direction is on the lower side of the surface on the front end side of the weight portion  23 . The indented portion  28  has a side surface that inclines in a direction toward the surface on the front end side of the resonance portion  21  as the side surface runs from the bottom portion on the inner side in the radial direction toward the outer side in the radial direction. The side surface intersects the weight portion  23  at a place at which the inner peripheral surface of the through-hole  124  in the weight portion  23  and the surface on the front end side intersect. 
     As shown in  FIG. 36 , in the mold MD for molding the resonance portion  21 , the core portions  28 M for molding the indented portion  28  protrude from the upper surface  22 Ma of the lower mold M 22 . The core portions  28 M extend in the radial direction from the core portion  27 M as the center. In addition, a plurality of the core portions  28 M (here, three at 120° intervals) are provided at intervals in the circumferential direction around the core portion  27 M. The position of the inner side of the core portion  28 M in the radial direction is outside the outer peripheral surface of the core portion  27 M and inside the inner peripheral surface of the through-hole  124 . The position of the outer side of the core portion  28 M in the radial direction is a position which is outside the inner peripheral surface of the through-hole  124  and inside the outer peripheral surface of the weight portion  23  and at which the upper surface  22 Ma and the core portion  28 M intersect. 
     The core portion  28 M has a side surface that inclines toward the upper surface  22 Ma as the side surface runs from the front end on the inner side in the radial direction toward the outer side in the radial direction. 
     Regarding the weight portion  23  disposed in the cavity CV of the mold MD having the above-described configuration, the front ends of the core portions  28 M are inserted into the through-hole  124 , and the intersection portion between the surface on the lower side shown in  FIG. 36  and the inner peripheral surface of the through-hole  124  are supported by the side surfaces of the core portions  28 M from below. Since the three core portions  28 M are disposed in the circumferential direction around the core portion  27 M, the weight portion  23  supported from below by the side surfaces of the core portions  28 M is positioned coaxially with the recessed portion  22 M. 
     When the resin material is poured into the cavity CV and the resonance portion  21  is molded in this state, the weight portion  23  is positioned coaxially with the core portion  27 M, that is, at the center of the base portion  22 . It should be noted that, even in a case where the weight portion  23  moves upward and deviates from the core portion  28 M at the time of pouring the resin material, the position of the weight portion  23  in the surface direction is regulated by the core portion  27 M, and thus the weight portion  23  becoming significantly uneven is suppressed. 
     As described above, in the present embodiment, not only can the same action and effect as in the sixth embodiment be obtained, but it also becomes possible to position the weight portion  23  in the void  27  (center position of the base portion  22 ) with high accuracy. 
     It should be noted that, in a case where the weight portion  23  does not deviate from the core portion  28 M due to the adjustment of molding conditions or the like, a configuration in which the core portion  27 M is not provided as shown in  FIG. 37  may be adopted. 
     In addition, in the eighth embodiment, a configuration in which the core portion  27 M and the core portions  28 M are disposed apart in the radial direction has been exemplified, but the configuration is not limited to this configuration, and for example, the inner sides of the core portions  28 M in the radial direction may be in contact with the outer peripheral surface of the core portion  27 M in the configuration. 
     [Ninth Embodiment of Sound-Blocking Sheet Member and Manufacturing Method] 
     Subsequently, a ninth embodiment of the sound-blocking sheet member  100  and a manufacturing method therefor will be described with reference to  FIG. 38  and  FIG. 39 . 
     In these drawings, the same element as the component of the eighth embodiment shown in  FIG. 34  to  FIG. 37  will be given the same reference sign and will not be described again. 
       FIG. 38  is a partial detailed view of the cavity CV, which is a space in which the resonance portion  21  is to be molded. 
     As shown in  FIG. 38 , the core portion  28 M of the present embodiment is disposed coaxially with the recessed portion  22 M. The core portion  28 M is formed in a truncated cone shape in which the diameter gradually increases from the front end toward the base end of the upper surface  22 Ma. 
     The diameter of the front end surface of the core portion  28 M is smaller than the diameter of the through-hole  124  in the weight portion  23 . The diameter of the base end portion of the core portion  28 M is larger than the diameter of the through-hole  124  in the weight portion  23 . Therefore, the intersection portion between the surface on the lower side and the inner peripheral surface of the through-hole  124  is supported from below by the side surfaces of the core portions  28 M, and the weight portion  23  disposed in the cavity CV is positioned coaxially with the recessed portion  22 M. 
     Therefore, in the present embodiment, not only can the same action and effect as in the eighth embodiment be obtained, but it is also possible to obtain the core portion  28 M having a high strength and to extend the service life of the mold MD since no edge portion is formed in the core portion  28 M. 
     It should be noted that the core portion  28 M of the present embodiment may be, in addition to the configuration of the truncated cone shape, a configuration in which, for example, in a plan view, a plurality of linear portions extending from the center of the recessed portion  22 M are disposed at intervals (for example, 120° intervals) in the circumferential direction as shown in  FIG. 39 . 
     [Tenth Embodiment of Sound-Blocking Sheet Member and Manufacturing Method] 
     Subsequently, a tenth embodiment of the sound-blocking sheet member  100  and a manufacturing method therefor will be described with reference to  FIG. 40  and  FIG. 41 . 
     In these drawings, the same element as the component of the eighth and ninth embodiments shown in  FIG. 34  to  FIG. 39  will be given the same reference sign and will not be described again. 
     Regarding the core portion  28 M of the eighth and ninth embodiments, a configuration in which the weight portion  23  comes into contact with and is supported by the intersection portion between the surface on the lower side of the weight portion  23  and the inner peripheral surface of the through-hole  124  has been exemplified; however, in the present embodiment, a configuration in which the weight portion  23  comes into contact with and is supported by the intersection portion between the surface on the lower side and the outer peripheral surface will be described. 
       FIG. 40  is a partial detailed view of the cavity CV, which is a space in which the resonance portion  21  is to be molded.  FIG. 41  is a plan view of the resonance portion  21 . 
     As shown in  FIG. 40 , the position of the outer side in the radial direction of the core portion  28 M in the mold MD is outside the outer peripheral surface of the weight portion  23 . The position of the inner side of the core portion  28 M in the radial direction is outside the inner peripheral surface of the through-hole  124  and inside the outer peripheral surface of the weight portion  23 . The core portion  28 M has a side surface that inclines toward the upper surface  22 Ma as the side surface runs from the front end on the outer side in the radial direction toward the inner side in the radial direction. 
     As shown in  FIG. 41 , the indented portions  28  that are formed with the core portions  28 M extend in the radial direction from the void  27  as the center. In addition, a plurality of the indented portions  28  (here, three at 120° intervals) are provided at intervals in the circumferential direction around the void  27 . Therefore, the core portions  28 M also extend in the radial direction from the core portion  27 M as the center. In addition, a plurality of the core portions  28 M (here, three at 120° intervals) are provided at intervals in the circumferential direction around the core portion  27 M. 
     Regarding the weight portion  23  disposed in the cavity CV of the mold MD having the above-described configuration, the front ends of the core portions  28 M are positioned on the upper side of the lower surface of the weight portion  23  on the outer side of the outer peripheral surface, and the intersection portion between the surface on the lower side and the outer peripheral surface of the weight portion  23  is supported by the side surfaces of the core portions  28 M from below. Since the three core portions  28 M are disposed in the circumferential direction around the core portion  27 M, the weight portion  23  supported from below by the side surfaces of the core portions  28 M is positioned coaxially with the recessed portion  22 M. 
     Therefore, in the present embodiment, not only can the same action and effect as in the eighth and ninth embodiments be obtained, but it also becomes possible to support the weight portion  23  in a more stable state since the weight portion  23  is supported on the outer side in the radial direction compared with the eighth and ninth embodiments. 
     [Eleventh Embodiment of Sound-Blocking Sheet Member and Manufacturing Method] 
     Subsequently, an eleventh embodiment of the sound-blocking sheet member  100  and a manufacturing method therefor will be described with reference to  FIG. 42  and  FIG. 43 . 
     In these drawings, the same element as the component of the third embodiment shown in  FIG. 11  to  FIG. 20  will be given the same reference sign and will not be described again. 
     In the third embodiment, a configuration in which the indented portion  26  and the void  27  are provided on the front end side of the base portion  22  has been exemplified; however, in the eleventh embodiment, a configuration in which, on the front end side of the base portion  22 , the indented portion  26  is not provided and only the void  27  is provided will be described. 
       FIG. 42  is a partial cross-sectional view of the resonance portion  21  in which the weight portion  23  is buried in the base portion  22 . 
     As shown in  FIG. 42 , in the base portion  22  of the present embodiment, the void  27  having a circular cross-sectional shape that is open on the front end side and extends in the axial direction is provided. The void  27  is provided coaxially with the through-hole  124  in the weight portion  23 . 
       FIG. 43  is a partial detailed view of the cavity CV, which is a space in which the resonance portion  21  is to be molded.  FIG. 43  shows a state in which the resin material has been poured into the cavity CV. In addition, in  FIG. 43 , the recessed portion  11 M and the upper mold M 11  are not shown. 
     In the present embodiment, the core portion  26 M that extends in the vertical direction, is fixed to the moving portion  64  at the lower end, and penetrates the lower mold M 22  and the core portion  27 M extending upward from the upper surface of the core portion  26 M are provided coaxially with the weight portion  23 . The diameter of the core portion  26 M is formed to be larger than the diameter of the through-hole in the weight portion  23  and smaller than the outer diameter of the weight portion  23 . When the moving portion  64  is at the upper end position, the core portion  26 M supports the surface on the front end side of the weight portion  23  from below at a position in the vertical direction at which the coating portion  125  is formed in a predetermined thickness between the weight portion  23  and the upper surface  22 Ma. 
     In the mold MD having the above-described configuration, as described in the fifth embodiment, the moving portion  64  is moved to the upper end position, and then the weight portion  23  is placed on the upper surface of the core portion  26 M in a state in which the core portion  27 M is inserted into the through-hole. After that, the above-described resin material is poured into the cavity CV. In addition, before the resin material reaches the peripheries of the core portions  26 M and  27 M and the resin material is completely cured, the core portions  26 M and  27 M are moved to the lower end position together with the moving portion  64  to make the front end surface of the core portion  26 M flush with the upper surface  22 Ma. 
     The resin material is poured into the cavity CV, whereby the resin material before curing enters the region in the cavity CV in which the core portion  26 M was provided due to the movement of the core portion  26 M. 
     As a result, as shown in  FIG. 42 , the resonance portion  21  in which the void  27  opens on the front end side and the front end side of the weight portion  23  is coated with the resin material except the void  27  is obtained. 
     After that, once the resin material is cured, the moving portion  64  is moved to the upper end position again. Therefore, the front end of the core portion  26 M pushes out the end portion of the resonance portion  21  from below, and the sound-blocking sheet member  100  is released from the lower mold M 21 . 
     As described above, in the present embodiment, not only can the same action and effect as in the third and fourth embodiments be obtained, but the core portion  26 M is moved to the upper end position after the curing of the resin material, whereby it becomes possible to easily release the sound-blocking sheet member  100  from the lower mold M 21 , the productivity improves, and additionally, it is also possible to reduce a defect that is generated during mold release. 
     It should be noted that, even in the case of using, for example, a cavity CV in which the step portion  26 M is not provided as shown in  FIG. 44  compared with the mold MD shown in  FIG. 33 , it is also possible to form the resonance portion  21  shown in  FIG. 42 . Even when there is no step portion, it is possible to pour the resin from the outer peripheral portion of the weight portion  23  or the inside of the through-hole  124  and to provide the resin to a portion below the weight portion  23 . In this case, compared with the case of using the cavity CV having a step portion as shown in  FIG. 43 , it takes a long time for the resin to wrap around the portion below the weight portion  23 , and a film to be formed is thin. On the other hand, it is possible to simplify the structure of the mold MD. 
     Hitherto, the preferred embodiments according to the present invention have been described with reference to the accompanying drawings, but it is needless to say that the present invention is not limited to such examples. The variety of shapes, combinations, and the like of the individual constituent members described in the above-described examples are examples, and a variety of modifications are permitted based on design requirements and the like without departing from the gist of the present invention. 
     For example, in the sixth to tenth embodiments, a configuration in which the through-hole  124  is formed in the weight portion  23  has been exemplified, but the configuration is not limited to this configuration, and the weight portion  23  may not be penetrated as in the recessed portion  24 A described in the fourth and fifth embodiments. In addition, contrary to the above-described configuration, the weight portion  23  of the fourth and fifth embodiments may have a through-hole. Furthermore, the weight portion  23  may be formed to have a separated part in the circumferential direction in the annular portion as in a spring washer. In this case, the penetration portion becomes a space that is surrounded by the inner peripheral surface of the weight portion and the separated front ends of the weight portion, opens on both the front end side and the rear end side of the weight portion, and communicate both end sides. 
     INDUSTRIAL APPLICABILITY 
     The present invention is applicable to a sound-blocking sheet member, a sound-blocking structure using same, and a method for manufacturing a sound-blocking sheet member. 
     REFERENCE SIGNS LIST 
     
         
         
           
               11 : sheet 
               11   a : sheet surface 
               11   b : sheet surface 
               21 : resonance portion (protrusion portion) 
               22 : base portion 
               22 Ma: upper surface (bottom portion) 
               23 : weight portion 
               24 : base portion 
               24 A: recessed portion 
               25 : weight portion 
               26 : indented portion 
               26 M: core portion (step portion) 
               27 : void 
               27 A: void 
               27 M: core portion (projection portion) 
               28 : indented portion 
               31 : rib-shaped protrusion portion 
               32 : rib-shaped protrusion portion 
               51 : support 
               61 : mold 
               61   a : cavity 
               61   b : cavity 
               70 : sheet 
               100 : sound-blocking sheet member 
               101 : sound-blocking sheet member 
               124 : through-hole (penetration portion) 
               125 : coating portion 
               200 : sound-blocking structure 
               201 : sound-blocking structure 
               203 : sound-blocking structure 
               300 : sound-blocking structure installation object 
             CV: cavity 
             H: maximum height of sound-blocking sheet member 
             H 1 : maximum height 
             H 2 : maximum height 
             M 11 : upper mold 
             M 12 : upper mold 
             M 21 : lower mold 
             M 22 : lower mold 
             M 111 : indentation (pot) 
             M 112 : penetration flow path 
             MD: mold 
             r 1 : length 
             r 2 : radius 
             h: height 
             hx: height 
             a: sheet length 
             i: weight portion 
             ii: base portion 
             iii: sheet 
             iv: support