Acoustic material

Abstract

To provide an acoustic material being advantageous for attaining reduction of manufacturing cost while securing rigidity.SOLUTION: An acoustic material 10 comprises a tabular acoustic material body 12, and a reinforcement plate 14 formed of a fiber-reinforced plastic. The reinforcement plate 14 comprises a tabular reinforcement plate body 16 joined to the acoustic material body 12, and a projecting wall part 18 which extends while projecting from one surface 1602 in a thickness direction of the reinforcement plate body 16 and is buried in the acoustic material body 12. A through hole 20 into which an acoustic material is filled penetrates the projecting wall part 18 in a thickness direction of the projecting wall part 18. A point 1202 of the acoustic material body 12 located on both sides of the projecting wall part 18 is connected by the acoustic material body 12 filled within the through hole 20. The point 1202 of the acoustic material body 12 located on both sides of the projecting wall part 18 and the reinforcement plate 14 are firmly integrated. That is, the acoustic material body 12 and the reinforcement plate 14 are firmly integrated.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to acoustic materials. [Background technology]

[0002] Acoustic materials have been provided that can be attached to structures such as the hull of a ship to reflect, absorb, and transmit sound waves (see Patent Document 1). Such acoustic materials include those made of a viscoelastic material and shaped like a rectangular plate of uniform thickness, which are attached by being superimposed on the outer surface of the steel plate that constitutes the structure. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2005-227702 Summary of the Invention [Problem to be solved by the invention]

[0004] In order to improve the rigidity of such acoustic materials, it has been proposed to reinforce the acoustic materials with reinforcing plates made of fiber-reinforced resin. In this case, the manufacturing process for the acoustic material is as follows. First, unvulcanized rubber is vulcanized using a mold to form a plate-shaped acoustic material body. Unvulcanized rubber is applied to one surface of the acoustic material in the thickness direction, and a reinforcing plate made of uncured fiber-reinforced resin is placed on top of it, and then vulcanization is carried out again to harden the fiber-reinforced resin and at the same time vulcanization bond the reinforcing plate to the acoustic material. This completes the acoustic material. Therefore, since two vulcanization processes (heat treatments) are required, the manufacturing costs of the acoustic material increase, and some kind of improvement is required. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an acoustic material that is advantageous in terms of reducing manufacturing costs while ensuring rigidity. [Means for solving the problem]

[0005] In order to achieve the above-mentioned object, one embodiment of the present invention comprises a plate-shaped acoustic material body having a thickness formed from an acoustic material, and a reinforcing plate formed from a fiber-reinforced resin and having higher rigidity than the acoustic material body, wherein the reinforcing plate has a plate-shaped reinforcing plate body joined to one surface in the thickness direction of the acoustic material body, and a convex wall portion that extends and protrudes from one surface in the thickness direction of the reinforcing plate body and is embedded in the acoustic material body, and the through holes provided in the convex wall portion that penetrate the thickness direction of the convex wall portion are filled with the acoustic material. In addition, one embodiment of the present invention is characterized in that the acoustic material body is made up of multiple types of laminated acoustic material bodies with different acoustic performances, the reinforcing plate is formed by joining the reinforcing plate body between adjacent acoustic material bodies, the convex wall portions are provided on both sides of the reinforcing plate body in the thickness direction, the convex wall portions provided on both sides of the thickness direction are embedded in adjacent acoustic material bodies, and the through holes are filled with the acoustic material. In one embodiment of the present invention, the through holes are provided in plurality at intervals in the length direction of the protruding wall portion. In one embodiment of the present invention, the protruding wall portion is formed to extend in two directions perpendicular to each other on the one surface. In addition, one embodiment of the present invention is characterized in that the fiber reinforced resin is formed from a material having acoustic performance similar to that of the acoustic material forming the acoustic material body. In addition, one embodiment of the present invention is characterized in that the acoustic material forming the acoustic body is a viscoelastic body. [Effects of the Invention]

[0006] According to one embodiment of the present invention, the acoustic material body on both sides of the ridge wall portion is connected by the acoustic material body filled in the through hole, and the acoustic material body and the reinforcing plate are firmly integrated. Therefore, the reinforcing plate is advantageous in ensuring the bending rigidity of the acoustic material and in suppressing the amount of deformation and displacement (distortion) of the acoustic material when pressure is applied to the acoustic material. Furthermore, the ridge wall portion also functions as a component that contributes to increasing the rigidity of the reinforcing plate body, together with the reinforcing plate body, and is advantageous in suppressing the amount of deformation and displacement (distortion) of the acoustic material when pressure is applied to the acoustic material. Furthermore, the acoustic material body and the reinforcing plate can be firmly integrated by a single vulcanization treatment or heat treatment, which is advantageous in reducing manufacturing costs. In addition, by providing a main body of acoustic material made of multiple laminated types of material with different acoustic performance, and a reinforcing plate formed by joining a reinforcing plate main body between adjacent main bodies of acoustic material, and providing convex wall portions on both sides of the main body of the reinforcing plate in the thickness direction, and embedding the convex wall portions on both sides in the thickness direction in adjacent main bodies of acoustic material, the adjacent main bodies of acoustic material located on both sides of the convex wall portions and the reinforcing plate are firmly integrated. Therefore, the reinforcing plate is advantageous in ensuring the bending rigidity of the acoustic material, and in suppressing the amount of deformation and displacement (distortion) of the acoustic material when pressure is applied to the acoustic material. Furthermore, by providing multiple through holes at intervals along the length of the convex wall portion, the portions of the acoustic material main body located on both sides of the convex wall portion are connected by the portions of the acoustic material main body filled in the multiple through holes, which is advantageous in firmly integrating the portions of the acoustic material main body located on both sides of the convex wall portion with the reinforcing plate, and firmly integrating the acoustic material main body with the reinforcing plate. Furthermore, if the convex wall portion is formed to extend in two perpendicular directions on one surface of the reinforcing plate body in the thickness direction, the portions of the acoustic material body located on both sides of the convex wall portion and the reinforcing plate can be integrated in a balanced manner, which is advantageous for integrating the acoustic material body and the reinforcing plate in a balanced manner. Furthermore, if the fiber reinforced resin is made of a material that has acoustic properties similar to those of the acoustic material that forms the acoustic material body, this is advantageous in improving the acoustic characteristics of the acoustic material. Furthermore, if the acoustic material that forms the main body of the acoustic material is made viscoelastic, the acoustic performance of the acoustic material will be closer to that of the reinforcing plate made of fiber-reinforced resin, which is more advantageous in suppressing the effect of the reinforcing plate on the acoustic performance and ensuring the acoustic performance of the acoustic material. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1A is a perspective view showing the structure of an acoustic material according to a first embodiment, and FIG. 1B is a side view. [Figure 2] FIG. 2 is a perspective view of a reinforcing plate according to the first embodiment. [Figure 3] FIG. 10(A) is a perspective view showing the structure of an acoustic material according to a second embodiment, and FIG. [Figure 4] FIG. 10 is a perspective view of a reinforcing plate according to a second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0008] (First embodiment) Next, an acoustic material according to a first embodiment will be described with reference to FIGS. The acoustic material 10 is attached by being superimposed on the outer surface (attachment surface) of a steel plate that constitutes a structure (not shown), such as the hull of a ship, to reflect, absorb, and transmit sound waves. The acoustic material 10 is configured to include an acoustic material body 12 and a reinforcing plate 14. The acoustic material body 12 is formed from an acoustic material that has predetermined acoustic performance (sound insulation, sound absorption, and transparency), and in this embodiment, a viscoelastic body is used as the acoustic material. As the viscoelastic body, various conventionally known viscoelastic bodies such as rubber and synthetic resins such as urethane can be used. As shown in Figures 1(A) and (B), the acoustic material body 12 is formed in the shape of a rectangular plate having a uniform thickness T1, a uniform width W1 and a uniform length L1 that are larger than the thickness T1, and in this embodiment, it is formed in the shape of a square plate with the width W1 and length L1 being equal. The thickness T1 is, for example, about 10 mm to 100 mm.

[0009] As shown in Figure 2, the reinforcing plate 14 is made of fiber-reinforced resin that has higher rigidity than the acoustic material main body 12 and is made of a material that has acoustic performance (acoustic impedance) similar to that of the acoustic material that forms the acoustic material main body 12. Using a fiber reinforced resin with an acoustic impedance close to that of the acoustic material is advantageous in ensuring the acoustic performance of the acoustic material 10. As such a fiber reinforced resin, various conventionally known fiber reinforced resins such as glass fiber reinforced plastic (GFRP) and carbon fiber reinforced plastic (CFRP) can be used.

[0010] The reinforcing plate body 16 is formed in the shape of a square plate having the same uniform width W1 and length L1 as the acoustic material body 12, and its thickness T2 is, for example, about 1 mm to 3 mm. The protruding wall portion 18 extends while protruding from one surface 1602 in the thickness direction of the reinforcing plate main body 16 and is embedded in the acoustic material main body 12 . In this embodiment, the convex wall portion 18 is formed to extend in two directions perpendicular to each other on one surface 1602 in the thickness direction of the reinforcing plate main body 16, and in detail, the two convex wall portions 18 are formed to extend along the center line in the width W1 direction and the center line in the length L1 direction of the acoustic material main body 12, respectively. The ridge wall portion 18 has through holes 20 that are filled with acoustic material and that penetrate the thickness of the ridge wall portion 18. In this embodiment, the through holes 20 are provided in multiple locations spaced apart along the length of the ridge wall portion 18.

[0011] The reinforcing plate body 16 and the ridge wall portion 18 are integrally molded using a mold and hardened by heating. Alternatively, the reinforcing plate body 16 and the ridge wall portion 18 may be separately molded using a mold and hardened by heating, and then the two may be joined together.

[0012] Also, as shown in Figure 1(B), the height H2 of the convex wall portion 18 may be formed to be smaller than the thickness T1 of the acoustic material main body 12, and the tip of the convex wall portion 18 may be located inside the surface of the acoustic material main body 12 located opposite the reinforcing plate main body 16. Alternatively, the height H2 of the convex wall portion 18 may be formed to have the same dimensions as the thickness T1 of the acoustic material main body 12, and the tip of the convex wall portion 18 may be located on the same plane as the surface of the acoustic material main body 12 located opposite the reinforcing plate main body 16. In addition, the length of the convex wall portion 18 may be formed with dimensions such that both ends of the convex wall portion 18 in the longitudinal direction are positioned at a location displaced inward from the four side surfaces of the acoustic material main body 12, or may be formed with dimensions such that both ends of the convex wall portion 18 in the longitudinal direction are positioned on the four side surfaces of the acoustic material main body 12.

[0013] As shown in Figures 1(A) and (B), when the convex wall portion 18 is embedded in the acoustic material main body 12, portions 1202 of the acoustic material main body 12 located on both sides of the convex wall portion 18 are connected by portions 1204 of the acoustic material main body 12 filled in multiple through holes 20. When manufacturing the acoustic material 10 using an acoustic material in a raw rubber state before vulcanization, one surface 1602 in the thickness direction of the reinforcing plate main body 16 is vulcanization bonded (joined) to the acoustic material main body 12 during vulcanization. Furthermore, when the acoustic material 10 is manufactured using an acoustic material such as highly fluid urethane, one surface 1602 in the thickness direction of the reinforcing plate main body 16 is adhered (joined) to the acoustic material main body 12 when the urethane hardens. Furthermore, when manufacturing the acoustic material 10, if an acoustic material in a raw rubber state is used, the acoustic material expands, foams, and flows during vulcanization, flowing into and filling the through holes 20; and if urethane, which has high fluidity, is used as the acoustic material, the acoustic material flows into and fills the through holes 20.

[0014] Mounting holes 22 are formed through the four corners of the acoustic material 10, i.e., the four corners of the acoustic material main body 12 and the reinforcing plate main body 16, for attaching the acoustic material 10 to a mounting surface of a structure such as a ship's hull. Stud bolts (not shown) protrude from the mounting surface (not shown) corresponding to each mounting hole 22, and the acoustic material 10 is attached to the mounting surface by inserting each stud bolt into each mounting hole 22 with the reinforcing plate main body 16 facing the mounting surface of the structure and tightening nuts onto each stud bolt.

[0015] According to this embodiment, the acoustic material 10 comprises a plate-shaped acoustic material main body 12 and a reinforcing plate 14 formed from fiber-reinforced resin, and the reinforcing plate 14 has a plate-shaped reinforcing plate main body 16 joined to the acoustic material main body 12, and a convex wall portion 18 that extends and protrudes from one surface 1602 of the reinforcing plate main body 16 in the thickness direction and is embedded in the acoustic material main body 12, and the convex wall portion 18 has a through hole 20 that is filled with acoustic material and penetrates the convex wall portion 18 in the thickness direction. Therefore, the portions 1202 of the acoustic material main body 12 located on both sides of the convex wall portion 18 are connected by the acoustic material main body 12 filled in the through hole 20, and the portions 1202 of the acoustic material main body 12 located on both sides of the convex wall portion 18 and the reinforcing plate 14 are firmly integrated, i.e., the acoustic material main body 12 and the reinforcing plate 14 are firmly integrated. Therefore, the reinforcing plate 14 is advantageous in ensuring the bending rigidity of the acoustic material 10, and in suppressing the amount of deformation and displacement (distortion) of the acoustic material 10 when pressure is applied to the acoustic material 10. Furthermore, as described above, the convex wall portion 18 functions as a member that firmly integrates the acoustic material main body 12 and the reinforcing plate 14, and also functions as a member that contributes to increasing the rigidity of the reinforcing plate 14 together with the reinforcing plate main body 16, which is advantageous in suppressing the amount of deformation and displacement (distortion) of the acoustic material 10 when pressure is applied to the acoustic material 10. Furthermore, unlike conventional methods, two vulcanization processes are not required, and the acoustic material body 12 and the reinforcing plate 14 can be firmly integrated with one vulcanization process, which is advantageous in reducing manufacturing costs.Similarly, when urethane is used as the acoustic material, only one heating process is required, which is also advantageous in reducing manufacturing costs.

[0016] Furthermore, since multiple through holes 20 are provided at intervals along the length of the convex wall portion 18, the portions of the acoustic material main body 12 located on both sides of the convex wall portion 18 are connected by the portions of the acoustic material main body 12 filled in the multiple through holes 20, which firmly integrates the portions of the acoustic material main body 12 located on both sides of the convex wall portion 18 with the reinforcing plate 14, and is advantageous in firmly integrating the acoustic material main body 12 and the reinforcing plate 14.

[0017] Furthermore, since the convex wall portion 18 is formed extending in two perpendicular directions on one surface 1602 in the thickness direction of the reinforcing plate main body 16, the portions of the acoustic material main body 12 located on both sides of the convex wall portion 18 are integrated with the reinforcing plate 14 in a balanced manner, which is advantageous for integrating the acoustic material main body 12 and the reinforcing plate 14 in a balanced manner.

[0018] Furthermore, fiber reinforced resin is made of a material that has acoustic properties similar to those of the acoustic material that forms the acoustic material body 12, and is therefore advantageous in improving the acoustic characteristics of the acoustic material 10.

[0019] Furthermore, since the acoustic material that forms the acoustic material body 12 is a viscoelastic material, the acoustic performance of the acoustic material is closer to that of the reinforcing plate 14 formed from fiber-reinforced resin, which is more advantageous in suppressing the effect of the reinforcing plate 14 on the acoustic performance and ensuring the acoustic performance of the acoustic material 10.

[0020] (Second embodiment) Next, a second embodiment will be described with reference to FIGS. In the following embodiment, the same parts and members as those in the first embodiment are denoted by the same reference numerals, and the following description will focus on the differences from the first embodiment. In the first embodiment, the acoustic material 10 comprises one acoustic material body 12 and one reinforcing plate 14, whereas in the second embodiment, the acoustic material 24 comprises multiple types of acoustic material bodies 26A-26E and one reinforcing plate 28, which is different from the first embodiment.

[0021] As shown in FIGS. 3(A) and 3(B), the acoustic material 24 is provided by laminating first, second, third, fourth, and fifth acoustic material bodies 26A-26E having different acoustic performances. In this way, the acoustic performance of the acoustic material 24 is improved by laminating a plurality of types of acoustic material bodies 26A-26E with different acoustic performances. The acoustic material 24 is attached with the first acoustic material body 26A facing the surface to be attached of the structure. In this embodiment, each acoustic material body 26A-26E has a uniform thickness T1, a uniform width W1 and a uniform length L1 that are dimensions greater than this thickness T1, and is formed in the shape of a square plate with the same width W1 and length L1, and the width W1 and length L1 of each acoustic material body 26A-26E will be described as being the same. The thickness T1 of each acoustic material body 26 is, for example, about 10 mm to 100 mm, as in the first embodiment, and the thickness T1 of each acoustic material body 26A-26E may be the same or different.

[0022] The reinforcing plate 28 is provided by joining a reinforcing plate body 30 between the adjacent third acoustic material body 26C and fourth acoustic material body 26D. As shown in Figure 4, the reinforcing plate main body 30 is formed in a square plate shape with a width W1 and length L1 in plan view, similar to each acoustic material main body 26A-26E, and its thickness T2 is, for example, approximately 1 mm to 3 mm, similar to the first embodiment. The convex wall portions 32A, 32B are provided on both sides 3002, 3002 in the thickness direction of the reinforcing plate main body 30, and the convex wall portions 32A, 32B provided on both sides 3002, 3002 in the thickness direction are embedded in the adjacent third acoustic material main body 26C and fourth acoustic material main body 26D, respectively. In this embodiment, the convex wall portions 32A, 32B provided on both sides 3002, 3002 of the reinforcing plate main body 30 in the thickness direction are formed to extend along the diagonal of the reinforcing plate main body 30, and therefore the convex wall portions 32A, 32B provided on both sides 3002, 3002 of the reinforcing plate main body 30 in the thickness direction are provided at the same location when viewed in a plane. As in the first embodiment, a plurality of through holes 20 are provided at intervals in the longitudinal direction of the protruding wall portions 32A, 32B. Furthermore, as in the first embodiment, the height H2 of the convex wall portions 32A, 32B from both surfaces 3002, 3002 in the thickness direction of the reinforcing plate main body 30 may be formed to be smaller than the thickness T1 of the third and fourth acoustic material main bodies 26C, 26D, and the tips of the convex wall portions 32A, 32B may be located inside the surfaces of the third and fourth acoustic material main bodies 26C, 26D located opposite the reinforcing plate main body 30. Alternatively, the height H2 of the convex wall portions 32A, 32B may be formed to have the same dimensions as the thickness T1 of the third and fourth acoustic material bodies 26C, 26D, and the tips of the convex wall portions 32A, 32B may be located on the same plane as the surfaces of the third and fourth acoustic material bodies 26C, 26D located opposite the reinforcing plate body 30.

[0023] As shown in Figure 3, when each of the convex wall portions 32A, 32B on both sides 3002, 3002 of the reinforcing plate main body 30 is embedded in the third acoustic material main body 26C and the fourth acoustic material main body 26D, the portions 2602 of the third acoustic material main body 26C and the fourth acoustic material main body 26D located on both sides of the convex wall portions 32A, 32B are connected by portions 2604 of the third acoustic material main body 26C and the fourth acoustic material main body 26D filled in the multiple through holes 20, as in the first embodiment. In the second embodiment, the mounting holes 22 are provided in four areas partitioned by the respective ridge wall portions 32A and 32B in plan view.

[0024] In addition, when the acoustic material 24 is manufactured using an acoustic material in a raw rubber state before vulcanization, one surface 3002 in the thickness direction of the reinforcing plate main body 30 is vulcanization bonded to the third acoustic material main body 26C during vulcanization, and the other surface 3002 is vulcanization bonded to the fourth acoustic material main body 26D. Furthermore, when the acoustic material 24 is manufactured using a highly fluid acoustic material such as urethane, when the acoustic material hardens, one surface 3002 in the thickness direction of the reinforcing plate main body 30 is adhered to the third acoustic material main body 26C, and the other surface 3002 is adhered to the fourth acoustic material main body 26D.

[0025] Furthermore, when manufacturing the acoustic material 24, if an acoustic material in a raw rubber state is used, the acoustic material of the third and fourth acoustic material bodies 26C, 26D will expand, foam, and flow during vulcanization, flowing into the through hole 20; further, if urethane, which has high fluidity, is used as the acoustic material, the acoustic material will flow into the through hole 20, filling the through hole 20 with the acoustic material. In addition, when using acoustic material in a raw rubber state when manufacturing the acoustic material 24, the vulcanization bonding (joining) between the reinforcing plate 28 and the third acoustic material body 26C and the vulcanization bonding (joining) between the reinforcing plate 28 and the fourth acoustic material body 26D are performed simultaneously with the vulcanization bonding (joining) between the first and second acoustic material bodies 26A, 26B, the vulcanization bonding (joining) between the second and third acoustic material bodies 26B, 26C, and the vulcanization bonding (joining) between the fourth and fifth acoustic material bodies 26D, 26E. Furthermore, when manufacturing the acoustic material 24, if highly fluid urethane is used as the acoustic material, the bonding (joining) between the reinforcing plate 28 and the third acoustic material body 26C and the bonding (joining) between the reinforcing plate 28 and the fourth acoustic material body 26D are performed simultaneously when the urethane hardens, as are the bonding (joining) between the first and second acoustic material bodies 26A and 26B, the bonding (joining) between the second and third acoustic material bodies 26B and 26C, and the bonding (joining) between the fourth and fifth acoustic material bodies 26D and 26E.

[0026] According to the second embodiment, there is provided acoustic material main bodies 26A-26E which are stacked together with multiple types of material having different acoustic performance, and a reinforcing plate 28 which is provided by joining a reinforcing plate main body 30 between adjacent third and fourth acoustic material main bodies 26C and 26D, and the convex wall portions 32A, 32B are provided on both sides 3002, 3002 in the thickness direction of the reinforcing plate main body 30, respectively, and the convex wall portions 32A, 32B provided on both sides 3002, 3002 in the thickness direction, respectively, are embedded in the adjacent third and fourth acoustic material main bodies 26C and 26D. Therefore, the portions 2602 of the third acoustic material body 26C and the fourth acoustic material body 26D located on both sides of the convex wall portions 32A, 32B are connected by the third acoustic material body 26C and the fourth acoustic material body 26D filled in the through hole 20, and the portions 2602 of the third acoustic material body 26C and the fourth acoustic material body 26D located on both sides of the convex wall portions 32A, 32B are firmly integrated with the reinforcing plate 28, i.e., the third acoustic material body 26C, the fourth acoustic material body 26D and the reinforcing plate 28 are firmly integrated. Therefore, the reinforcing plate 28 is advantageous in ensuring the bending rigidity of the acoustic material 24, and is advantageous in suppressing the amount of deformation and displacement (distortion) of the acoustic material 24 when pressure is applied to the acoustic material 24.

[0027] In addition, the two convex wall portions 32A, 32B provided on both sides 3002, 3002 in the thickness direction of the reinforcing plate main body 30 function as members that firmly integrate the third acoustic material main body 26C, the fourth acoustic material main body 26D and the reinforcing plate 28 as described above, and also function as members that contribute to increasing the rigidity of the reinforcing plate 28 together with the reinforcing plate main body 30, which is advantageous in suppressing the amount of deformation and displacement (distortion) of the acoustic material 24 when pressure is applied to the acoustic material 24.

[0028] Furthermore, when raw rubber is used as the acoustic material, there is no need to perform two vulcanization processes as in the past, and a single vulcanization process can be used to simultaneously vulcanize bond (join) the reinforcing plate 28 to the third acoustic material body 26C, vulcanize bond (join) the reinforcing plate 28 to the fourth acoustic material body 26D, vulcanize bond (join) the first and second acoustic material bodies 26A and 26B together, vulcanize bond (join) the second and third acoustic material bodies 26B and 26C together, and vulcanize bond (join) the fourth and fifth acoustic material bodies 26D and 26E together, which is advantageous in reducing manufacturing costs.Similarly, when urethane is used as the acoustic material, a single heating process can be used to simultaneously vulcanize bond (join) the reinforcing plate 28 to the third acoustic material body 26C, vulcanize bond (join) the reinforcing plate 28 to the fourth acoustic material body 26D, and bond (join) adjacent acoustic material bodies together, which is advantageous in reducing manufacturing costs.

[0029] In the second embodiment, a case has been described in which a reinforcing plate 28 is joined between adjacent third and fourth acoustic material bodies 26C and 26D among the multiple acoustic material bodies 26A-26E, but the location at which the reinforcing plate 28 is joined is not limited, and the reinforcing plate 28 may also be joined between adjacent acoustic material bodies other than the third and fourth acoustic material bodies 26C and 26D. Furthermore, in the first and second embodiments, the case where one reinforcing plate 14, 28 is provided has been described, but the number of reinforcing plates 14, 28 may be two or more. For example, in the first embodiment, the reinforcing plate 14 may be provided on both sides in the thickness direction of the acoustic material main body 12. In this case, the convex wall portions 18 may be configured not to interfere with each other. Furthermore, in the second embodiment, the second reinforcing plate 28 may be joined to a location of the first acoustic material main body 26A facing the mounting surface, or may be joined between the first acoustic material main body 26A and the second acoustic material main body 26B, between the second acoustic material main body 26B and the third acoustic material main body 26C, between the fourth acoustic material main body 26D and the fifth acoustic material main body 26E, or to the surface of the fifth acoustic material main body 26E located opposite the fourth acoustic material main body 26D.

[0030] In the embodiment, the case where the convex wall portions 18, 32A, 32B extend linearly in a planar view has been described, but the convex wall portions 18, 32A, 32B may be curved, circular, elliptical, triangular, rectangular, or polygonal in a planar view, and the shape of the convex wall portions 18, 32A, 32B is arbitrary. [Explanation of symbols]

[0031] 10 Acoustic materials 12 Acoustic material body 1202 Areas located on both sides of the convex wall 1204 Filled area inside the through hole 14 Reinforcement plate 16 Reinforcement plate body 1602 One side in the thickness direction 18 Convex wall 20 through holes 22 Mounting holes 24 Acoustic materials 26A First Acoustic Material Body 26B Second acoustic material body 26C 3rd acoustic material body 26D 4th acoustic material body 26E 5th acoustic material body 2602 Areas located on both sides of the convex wall 2604 Filled area inside the through hole 28 Reinforcement plate 30 Reinforcement plate body 3002 Thickness direction surface 32A, 32B Convex wall section

Claims

1. A plate-shaped acoustic material body having a thickness formed from an acoustic material; a reinforcing plate formed of fiber reinforced resin and having higher rigidity than the acoustic material body, The reinforcing plate has a plate-shaped reinforcing plate main body that is joined to one surface in the thickness direction of the acoustic material main body, and a protruding wall portion that extends while protruding from one surface in the thickness direction of the reinforcing plate main body and is embedded in the acoustic material main body, The acoustic material is filled into through holes formed in the protruding wall portion and penetrating the protruding wall portion in a thickness direction thereof. An acoustic material characterized by:

2. The acoustic material body is provided by laminating multiple types of material with different acoustic performances, The reinforcing plate is provided by joining the reinforcing plate body between adjacent ones of the acoustic material bodies, The protruding wall portions are provided on both sides of the reinforcing plate body in the thickness direction, The protruding wall portions provided on both sides in the thickness direction are embedded in the adjacent acoustic material bodies, and the through holes are filled with the acoustic material.

2. The acoustic material according to claim 1.

3. The through holes are provided in a plurality at intervals in the longitudinal direction of the protruding wall portion.

3. The acoustic material according to claim 1 or 2.

4. The protruding wall portion is formed to extend in two directions perpendicular to each other on the one surface.

3. The acoustic material according to claim 1 or 2.

5. The fiber reinforced resin is formed of a material having acoustic performance similar to that of the acoustic material forming the acoustic material body.

3. The acoustic material according to claim 1 or 2.

6. The acoustic material forming the acoustic body is a viscoelastic material.

3. The acoustic material according to claim 1 or 2.

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