Sound-absorbing structure sheet, sound-absorbing structure sheet set, and sound-absorbing structure

Abstract

The invention relates to a sound-absorbing structure sheet, a sound-absorbing structure sheet group, and a sound-absorbing structure, which can restrain large volume during storage. A sound-absorbing structure (100) is provided with: a sound-absorbing structure member (101) formed from a bendable sheet (1); and a film member (102) that forms a flexible film. A sound-absorbing structural member (101) is provided with: a perforated plate (110) having a plurality of through-holes (111); and an annular side wall part (120) surrounding the punched plate (110) from the outer peripheral side. The punched plate (110) is formed by bending the sheet (1). The side wall part (120) is formed by bending the sheet (1). The punched plate (110) is located between the pair of ends (120a, 120b) of the side wall portion (120) in the direction in which the punched plate faces. The film member (102) faces the punched plate (110) in a direction in which the punched plate faces, and forms a space (S1) between the film member (102) and the punched plate.

Description

Technical Field

[0001] This invention relates to sound-absorbing structural sheet, sound-absorbing structural sheet assembly, and sound-absorbing structure. Background Technology

[0002] In the past, various sound insulation structures have been proposed for sound insulation. Among these sound insulation structures, there are sound-absorbing structures that have a sound-absorbing function (for example, see Patent Document 1).

[0003] [Existing Technical Documents]

[0004] [Patent Literature]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2008-096826. Summary of the Invention

[0006] The problem that the invention aims to solve

[0007] Traditional sound-absorbing structures consist of multiple components. Therefore, they are bulky and require considerable storage space. Consequently, for example, partitions intended for use in disaster relief facilities such as schools, storage space is sometimes a concern when storing such structures for emergency purposes. Thus, in some cases, it is impossible to store a sufficient number of sound-absorbing structures for emergency disaster relief purposes, or the storage of such structures may be abandoned.

[0008] Therefore, conventional sound-absorbing structures require a design that can reduce storage space.

[0009] The present invention was made in view of the above-mentioned problems, and its object is to provide a sound-absorbing structural sheet, a group of sound-absorbing structural sheets, and a sound-absorbing structure that can suppress the large volume of sound-absorbing structural sheet during storage.

[0010] means for solving problems

[0011] To achieve the above objectives, the present invention provides a sound-absorbing structural sheet that can be assembled onto a sound-absorbing structure. The sound-absorbing structural sheet is formed from a bendable sheet and includes: a perforated plate portion forming a perforated plate with a plurality of through holes; a pair of first sidewall portions forming a pair of opposing first sidewalls; and a pair of second sidewall portions forming a pair of opposing second sidewalls. The perforated plate portion has a first end and a second end, the first end being a pair of opposing ends, and the second end being a pair of opposing ends extending in a direction intersecting the first end. The pair of first sidewall portions are respectively connected to the pair of first ends of the perforated plate portion in a bendable manner, and the pair of second sidewall portions are respectively connected to the pair of second ends of the perforated plate portion in a bendable manner. The pair of first sidewall portions are respectively bendable so that the perforated plate is located between the pair of ends of the first sidewall portion in the direction facing the perforated plate, and the pair of second sidewall portions are respectively bendable so that the perforated plate is located between the pair of ends of the second sidewall portion in the direction facing the perforated plate.

[0012] In one aspect of the sound-absorbing structure sheet of the present invention, the first sidewall portion has a plurality of sidewall plates extending along the first end, and the second sidewall portion has a plurality of sidewall plates extending along the second end. In the first sidewall portion, the plurality of sidewall plates are connected in a bendable manner in an extending direction of the first sidewall portion extending from the first end, and in the second sidewall portion, the plurality of sidewall plates are connected in a bendable manner in an extending direction of the second sidewall portion extending from the second end.

[0013] In a sound-absorbing structural sheet according to one aspect of the present invention, the plurality of sidewall panels of the first sidewall portion include: a first inner wall panel capable of bending in one direction toward the direction facing the perforated plate portion; and an outer wall panel capable of bending relative to the first inner wall panel in another direction toward the direction facing the perforated plate portion. The plurality of sidewall panels of the second sidewall portion include: a first inner wall panel capable of bending in one direction toward the direction facing the perforated plate portion; and an outer wall panel capable of bending relative to the first inner wall panel in another direction toward the direction facing the perforated plate portion. In the first sidewall portion, the width of the outer wall panel in the extending direction is greater than the width of the first inner wall panel in the extending direction. In the second sidewall portion, the width of the outer wall panel in the extending direction is greater than the width of the first inner wall panel in the extending direction.

[0014] In a sound-absorbing structural sheet according to one aspect of the present invention, the plurality of sidewall panels of the first sidewall portion include a second inner wall panel, the second inner wall panel being bendable relative to the outer wall panel in a direction opposite to the direction facing the perforated plate portion, and the plurality of sidewall panels of the second sidewall portion include a second inner wall panel, the second inner wall panel being bendable relative to the outer wall panel in a direction opposite to the direction facing the perforated plate portion.

[0015] In one aspect of the sound-absorbing structure sheet of the present invention, the second sidewall portion has a fixing portion for fixing the second sidewall portion to the first sidewall portion, the fixing portion fixing the second sidewall portion to the first sidewall portion such that a pair of ends of the second sidewall portion along the extension direction of the second end face each of an adjacent pair of ends of the first sidewall portion along the extension direction of the first end.

[0016] In one aspect of the sound-absorbing structure sheet of the present invention, the bendable sheet is made of corrugated paper.

[0017] To achieve the above objectives, the present invention provides a sound-absorbing structural sheet assembly capable of being assembled onto a sound-absorbing structure, comprising: a sound-absorbing structural sheet formed of a bendable sheet; and a membrane component forming a flexible membrane. The sound-absorbing structural sheet has: a perforated plate portion forming a perforated plate with a plurality of through holes; a pair of first sidewall portions forming a pair of opposing first sidewalls; and a pair of second sidewall portions forming a pair of opposing second sidewalls. The perforated plate portion has a first end and a second end, the first end being a pair of opposing ends, and the second end being a pair of opposing ends extending in a direction intersecting the first end. The pair of first sidewall portions are respectively connected to the pair of first ends of the perforated plate portion in a bendable manner, and the pair of second sidewall portions are respectively connected to the pair of second ends of the perforated plate portion in a bendable manner. The pair of first sidewall portions are respectively bendable in a direction protruding from the perforated plate towards the direction facing the perforated plate, and the pair of second sidewall portions are respectively bendable in a direction protruding from the perforated plate towards the direction facing the perforated plate. The membrane component faces the perforated plate in a direction facing the perforated plate and forms the space between itself and the perforated plate.

[0018] One aspect of the present invention relates to a sound-absorbing structure sheet assembly, which further includes a frame member sheet formed from the bendable sheet, the frame member sheet being bent and bonded to form an annular frame member capable of fixing the membrane member to the first sidewall and the second sidewall.

[0019] In one aspect of the sound-absorbing structure sheet assembly, the membrane component surrounds the first sidewall and the second sidewall from the outer peripheral side, and the frame component surrounds the first sidewall and the second sidewall from the outer peripheral side via the membrane component surrounding the first sidewall and the second sidewall from the outer peripheral side.

[0020] In one aspect of the sound-absorbing structure assembly, the frame member protrudes from the first and second sidewalls in the direction facing the perforated plate, and the protruding portion is capable of bending outwards.

[0021] In one aspect of the sound-absorbing structure assembly of the present invention, the pair of first sidewall portions are respectively bendable such that the perforated plate is located between a pair of ends of the first sidewall portions in the direction facing the perforated plate, and the pair of second sidewall portions are respectively bendable such that the perforated plate is located between a pair of ends of the second sidewall portions in the direction facing the perforated plate.

[0022] In one aspect of the sound-absorbing structure assembly of the present invention, the first sidewall portion has a plurality of sidewall plates extending along the first end, and the second sidewall portion has a plurality of sidewall plates extending along the second end. In the first sidewall portion, the plurality of sidewall plates are connected in a bendable manner in an extending direction of the first sidewall portion extending from the first end, and in the second sidewall portion, the plurality of sidewall plates are connected in a bendable manner in an extending direction of the second sidewall portion extending from the second end.

[0023] In one aspect of the sound-absorbing structure assembly of the present invention, the plurality of sidewall panels of the first sidewall portion include: a first inner wall panel capable of bending in a direction other than the direction facing the perforated plate portion; and an outer wall panel capable of bending relative to the first inner wall panel in a direction facing the perforated plate portion. The plurality of sidewall panels of the second sidewall portion include: a first inner wall panel capable of bending in a direction other than the direction facing the perforated plate portion; and an outer wall panel capable of bending relative to the first inner wall panel in a direction facing the perforated plate portion. In the first sidewall portion, the width of the outer wall panel in the extending direction is greater than the width of the first inner wall panel in the extending direction. In the second sidewall portion, the width of the outer wall panel in the extending direction is greater than the width of the first inner wall panel in the extending direction.

[0024] In one aspect of the sound-absorbing structure assembly of the present invention, the plurality of sidewall panels of the first sidewall portion include a second inner wall panel, the second inner wall panel being bendable relative to the outer wall panel in a direction facing the perforated plate portion, and the plurality of sidewall panels of the second sidewall portion include a second inner wall panel, the second inner wall panel being bendable relative to the outer wall panel in a direction facing the perforated plate portion.

[0025] In one aspect of the sound-absorbing structure assembly of the present invention, the second sidewall portion has a fixing portion for fixing the second sidewall portion to the first sidewall portion, the fixing portion fixing the second sidewall portion to the first sidewall portion such that a pair of ends of the second sidewall portion along the extension direction of the second end face each of an adjacent end of a pair of ends of the first sidewall portion along the extension direction of the first end.

[0026] One aspect of the present invention relates to a sound-absorbing structural sheet assembly, which further includes: a first support portion supporting the first sidewall to the perforated plate; and a second support portion supporting the second sidewall to the perforated plate, wherein the first support portion extends from the first sidewall portion in a bendable manner, and the second support portion extends from the second sidewall portion in a bendable manner.

[0027] In one aspect of the sound-absorbing structure assembly of the present invention, the first support portion is connected to a pair of ends of the first sidewall portion extending along the first end, the first support portion being bent relative to the first sidewall portion in the first sidewall portion bent relative to the perforated plate portion, and contacting the perforated plate portion at one end in the direction facing the perforated plate portion, the second support portion being connected to a pair of ends of the second sidewall portion extending along the second end, the second support portion being bent relative to the second sidewall portion in the second sidewall portion bent relative to the perforated plate portion, and contacting the perforated plate portion at one end in the direction facing the perforated plate portion.

[0028] In one aspect of the sound-absorbing structure sheet assembly, the bendable sheet is made of corrugated paper.

[0029] To achieve the above objectives, the sound-absorbing structure of the present invention includes: a sound-absorbing structural member formed of a bendable sheet; and a membrane member forming a flexible membrane, the sound-absorbing structural member having: a perforated plate having a plurality of through holes; and an annular sidewall surrounding the perforated plate from its outer periphery, the perforated plate being formed by bending the sheet, the sidewall being formed by bending the sheet, the sidewall protruding from the perforated plate in a direction facing the perforated plate, the membrane portion facing the perforated plate in one direction facing the perforated plate, and forming a space between the membrane portion and the perforated plate.

[0030] One aspect of the present invention relates to a sound-absorbing structure that further includes a frame member, which is an annular member and is formed of a bendable sheet, the frame member securing the membrane member to the sidewall.

[0031] In one aspect of the sound-absorbing structure, the outer peripheral end of the membrane member surrounds the sidewall from the outer peripheral side, and the frame member surrounds the sidewall from the outer peripheral side via the membrane member surrounding the sidewall from the outer peripheral side.

[0032] In one aspect of the sound-absorbing structure, the frame member protrudes from the sidewall in the direction facing the perforated plate, and the protruding portion of the frame member is capable of bending outwards.

[0033] In one aspect of the sound-absorbing structure, the perforated plate is located between a pair of ends of the sidewall in the direction in which the perforated plate faces.

[0034] In one aspect of the sound-absorbing structure of the present invention, the bendable sheet is a sheet made of corrugated paper.

[0035] [Invention Effects]

[0036] The sound-absorbing structural sheet, sound-absorbing structural sheet group, and sound-absorbing structure according to the present invention can suppress large volume during storage. Attached Figure Description

[0037] Figure 1 This is a perspective view showing a simplified structure of the sound-absorbing structure according to the first embodiment of the present invention.

[0038] Figure 2 This is a perspective view showing a simplified structure of the sound-absorbing structure according to the first embodiment of the present invention.

[0039] Figure 3 This is a perspective view showing a simplified structure of the sound-absorbing structure according to the first embodiment of the present invention.

[0040] Figure 4 It means along Figure 1 A cross-sectional view of line AA.

[0041] Figure 5 This is a perspective view showing a simplified structure of the sound-absorbing structure according to the second embodiment of the present invention.

[0042] Figure 6 This is an exploded perspective view showing the simplified structure of the sound-absorbing structure according to the second embodiment of the present invention.

[0043] Figure 7 It means along Figure 5 A cross-sectional view of line BB.

[0044] Figure 8 This is a perspective view showing a simplified structure of the membrane component in the sound-absorbing structure according to the second embodiment of the present invention.

[0045] Figure 9 This is a perspective view showing a simplified structure of the sound-absorbing structural component in the sound-absorbing structure according to the second embodiment of the present invention.

[0046] Figure 10 This is a top view showing the simplified structure of the sound-absorbing component.

[0047] Figure 11 This is a perspective view of a sound-absorbing structure according to a second embodiment of the present invention, which is a modified example of a frame component.

[0048] Figure 12 This is a perspective view showing a modified example of the sound-absorbing structure component of the sound-absorbing structure according to the second embodiment of the present invention.

[0049] Figure 13 This is a top view of the sound-absorbing structure sheet according to the first embodiment of the present invention.

[0050] Figure 14 It refers to components used to form sound-absorbing structures. Figure 13 A diagram showing a portion of the bending process of the sound-absorbing structural sheet.

[0051] Figure 15 It refers to components used to form sound-absorbing structures. Figure 13 A diagram showing a portion of the bending process of the sound-absorbing structural sheet.

[0052] Figure 16 It refers to components used to form sound-absorbing structures. Figure 13 A diagram showing a portion of the bending process of the sound-absorbing structural sheet.

[0053] Figure 17 It refers to components used to form sound-absorbing structures. Figure 13A diagram showing a portion of the bending process of the sound-absorbing structural sheet.

[0054] Figure 18 It refers to components used to form sound-absorbing structures. Figure 13 A diagram showing a portion of the bending process of the sound-absorbing structural sheet.

[0055] Figure 19 This is a top view of the sound-absorbing structure sheet according to the second embodiment of the present invention.

[0056] Figure 20 This is a top view of a modified example of the sound-absorbing structural sheet according to the second embodiment of the present invention.

[0057] Figure 21 This is a diagram showing a portion of the bending process of a modified example of a sound-absorbing structural sheet according to the second embodiment of the present invention used to form a sound-absorbing structural component.

[0058] Figure 22 This is a top view of the membrane component sheet.

[0059] Figure 23 This is a top view of the frame component sheet. Detailed Implementation

[0060] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Furthermore, in the drawings, sometimes not all of the constituent elements are labeled with reference numerals, and some of the reference numerals for the constituent elements are omitted.

[0061] Figure 1 This is a perspective view showing the simplified structure of the sound-absorbing structure 100 according to the first embodiment of the present invention. Figure 2 This is a perspective view showing a portion of the simplified structure of the sound-absorbing structure 100 according to the first embodiment of the present invention. Figure 3 This is a perspective view showing the simplified structure of the sound-absorbing structure 100. Figure 4 It means along Figure 1 A cross-sectional view of line AA. Additionally, Figure 3 Indicates from and Figure 1 , Figure 2 Sound-absorbing structure 100 viewed from the opposite side. For example... Figures 1 to 4As shown, the sound-absorbing structure 100 according to the first embodiment of the present invention includes a sound-absorbing structural member 101 formed from a bendable sheet 1 and a membrane member 102 forming a flexible membrane. The sound-absorbing structural member 101 includes a perforated plate 110 having a plurality of through holes 111; and an annular sidewall portion 120 surrounding the perforated plate 110 from its outer periphery. The perforated plate 110 is formed by bending the sheet 1. The sidewall portion 120 is formed by bending the sheet 1. The perforated plate 110 is located between a pair of ends 120a, 120b of the sidewall portion 120 in the direction facing the perforated plate 110. The membrane member 102 faces the perforated plate 110 in the direction facing the perforated plate 110, forming a space S1 between the membrane member and the perforated plate 110. The structure of the sound-absorbing structure 100 will be specifically described below. Furthermore, in Figure 1 The interior of the sound-absorbing structure 100 is shown through the membrane component 102.

[0062] The following, such as Figures 1 to 4 As shown, for ease of explanation, one side of the direction in which the perforated plate 110 faces is designated as the sound source side, and the other side of the direction in which the perforated plate 110 faces is designated as the fixing side.

[0063] like Figure 1 , Figure 3 As shown, the membrane component 102 is, for example, a flexible, thin membrane component with a pair of mutually back-to-back surfaces 102a and 102b. Surface 102a faces the sound source side, and surface 102b faces the stationary side. The membrane component 102 flexes in the direction facing surfaces 102a and 102b, thereby causing the membrane component 102 to vibrate. Figure 1 , Figure 3 As shown, the membrane component 102 is, for example, rectangular or substantially rectangular, having a pair of ends 102c, 102d facing away from each other and a pair of ends 102e, 102f facing away from each other. Ends 102e and 102f extend in directions intersecting the directions of extension of ends 102c and 102d. For example, ends 102c and 102d extend in a straight or substantially straight manner, and ends 102e and 102f extend or substantially orthogonally to the directions of extension of ends 102c and 102d.

[0064] The membrane component 102 is made of materials such as paper, soft resin film, or rubber. Examples of paper used as the material for the membrane component 102 include various types such as photocopying paper, newspaper, Japanese paper, and advertising paper. However, the material of the membrane component 102 is not limited to these. Furthermore, the areal density of the membrane component 102 is, for example, 0.03 kg / m³. 2 Above and 0.3 kg / m 2 The areal density of membrane component 102 is not limited to the values ​​described above. For example... Figure 2 , Figure 4As shown, the membrane component 102 is mounted on the side wall portion 120 with its surface 102b facing the perforated plate 110.

[0065] As described above, the sound-absorbing structural component 101 has a perforated plate 110 and a sidewall portion 120. For example... Figures 1 to 4 As shown, the sidewall portion 120 is a frame-shaped member that forms the outer edge of the sound-absorbing structural member 101, extending in a ring shape to surround the space S. Furthermore, the sidewall portion 120 has a height in the direction facing the perforated plate 110, extends in the same direction, has an end 120a on the sound source side, and an end 120b on the fixed side. For example, as... Figures 1 to 3 As shown, the sidewall portion 120 extends in a rectangular or approximately rectangular ring shape to enclose a rectangular or approximately rectangular space. Specifically, as... Figures 2 to 4 As shown, the sidewall portion 120 has wall plates 121, 122 and wall plates 123, 124. Wall plates 121 and 122 are opposite each other across a space S, and wall plates 123 and 124 are also opposite each other across a space S. Wall plates 123 and 124 extend in directions intersecting the extending directions of wall plates 121 and 122, for example, wall plates 123 and 124 are orthogonal or approximately orthogonal to the extending directions of wall plates 121 and 122. Wall plates 121, 122, 123, and 124 are plate-shaped, for example... Figures 2 to 4 As shown, the plate-shaped portion is rectangular or approximately rectangular. The shape of wall plate 121 is the same as or approximately the same as the shape of wall plate 122. In addition, the shape of wall plate 123 is the same as or approximately the same as the shape of wall plate 124. The shapes of wall plates 121, 122, 123, and 124 may also be the same as or approximately the same as each other.

[0066] like Figure 2As shown, the wall portion 121 has a pair of mutually opposing ends 121a and 121b and a pair of mutually opposing ends 121c and 121d. Ends 121a and 121b extend circumferentially along the sidewall portion 120, and ends 121c and 121d extend along the height direction of the sidewall portion 120. End 121a is the sound source side end, and end 121b is the fixed side end. Ends 121a and 121b respectively form a portion of ends 120a and 120b of the sidewall portion 120. Ends 121a and 121b extend along a plane. Ends 121c and 121d extend between ends 121a and 121b, for example, ends 121c and 121d extend orthogonally or substantially orthogonally to ends 121a and 121b, respectively. Additionally, the wall portion 122 has a pair of mutually opposing ends 122a and 122b, and a pair of mutually opposing ends 122c and 122d. Ends 122a and 122b extend circumferentially along the sidewall portion 120, while ends 122c and 122d extend along the height direction of the sidewall portion 120. End 122a is the sound source side end, and end 122b is the fixed side end. Ends 122a and 122b respectively form a portion of ends 120a and 120b of the sidewall portion 120. Ends 122a and 122b extend along a plane. Ends 122c and 122d extend between ends 122a and 122b, for example, ends 122c and 122d extend orthogonally or substantially orthogonally to ends 122a and 122b, respectively.

[0067] The shape of wall piece 123 is the same as or substantially the same as the shape of wall piece 124. For example... Figure 2As shown, the wall portion 123 has a pair of mutually opposing ends 123a and 123b and a pair of mutually opposing ends 123c and 123d. Ends 123a and 123b extend circumferentially along the sidewall portion 120, and ends 123c and 123d extend along the height direction of the sidewall portion 120. End 123a is the sound source side end, and end 123b is the fixed side end. Ends 123a and 123b respectively form a portion of ends 120a and 120b of the sidewall portion 120. Ends 123a and 123b extend along a plane. Ends 123c and 123d extend between ends 123a and 123b, for example, ends 123c and 123d extend orthogonally or substantially orthogonally to ends 123a and 123b, respectively. Additionally, the wall portion 124 has a pair of mutually opposing ends 124a and 124b, and a pair of mutually opposing ends 124c and 124d. Ends 124a and 124b extend circumferentially along the sidewall portion 120, and ends 124c and 124d extend along the height direction of the sidewall portion 120. End 124a is the sound source side end, and end 124b is the fixed side end. Ends 124a and 124b respectively form a portion of ends 120a and 120b of the sidewall portion 120. Ends 124a and 124b extend along a plane. Ends 124c and 124d extend between ends 124a and 124b, for example, ends 124c and 124d extend orthogonally or substantially orthogonally to ends 124a and 124b, respectively.

[0068] In the side wall portion 120, the wall pieces 121, 122, 123, and 124 are not integrally connected. That is, the ends 121c and 121d of the wall piece 121 are not integrally connected to the ends 123c of the wall piece 123 and 124d of the wall piece 124, respectively, and the ends 122c and 122d of the wall piece 122 are not integrally connected to the ends 123d of the wall piece 123 and 124c of the wall piece 124, respectively.

[0069] In addition, Figures 1 to 4 Although not shown in the diagram, the sidewall portion 123 has fixing portions 125a and 125b at ends 123c and 123d, respectively, for fixing the sidewall portion 123 to the sidewall portions 121 and 122, respectively. Similarly, the sidewall portion 124 has fixing portions 126a and 126b at ends 124c and 124d, respectively, for fixing the sidewall portion 124 to the sidewall portions 121 and 122, respectively. Details regarding the fixing portions 125a, 125b, 126a, and 126b will be described later.

[0070] The perforated plate 110 is used to form the Helmholtz resonator in the sound-absorbing structural component. For example... Figures 2 to 4As shown, the perforated plate 110 has a plate-like shape and a pair of mutually opposing surfaces 112 and 113. Surfaces 112 and 113 are, for example, surfaces along a plane. The perforated plate 110 has a shape corresponding to the space S enclosed by the sidewall portion 120, and the perforated plate 110 is, for example, as shown in the figure. Figures 2 to 4 As shown, it is a rectangular or roughly rectangular plate with a pair of mutually opposing ends 110a and 110b and a pair of mutually opposing ends 110c and 110d. Ends 110a, 110b, 110c, and 110d correspond to wall plates 121, 122, 123, and 124, respectively. Ends 110c and 110d extend in directions intersecting the extending directions of ends 110a and 110b. For example, ends 110a and 110b extend in a straight or roughly straight manner, and ends 110c and 110d are orthogonal or roughly orthogonal to the extending directions of ends 110a and 110b, respectively. The length of end 110a is equal to or approximately equal to the width between ends 121c and 121d of wall plate 121. The length of end 110b is equal to or approximately equal to the width between ends 122c and 122d of wall plate 122. The length of end 110c is equal to or approximately equal to the width between ends 123c and 123d of the wall plate 123. Similarly, the length of end 110d is equal to or approximately equal to the width between ends 124c and 124d of the wall plate 124. The perforated plate 110 has a plurality of through holes 111, which penetrate between surfaces 112 and 113. Figures 2 to 4 As shown, multiple through holes 111 are arranged in a matrix.

[0071] like Figures 2 to 4 As shown, the perforated plate 110 is located between ends 120a and 120b of the wall portion 120, and the side wall portion 120 protrudes from the perforated plate 110 towards both the sound source side and the fixed side. The perforated plate 110 divides the space S defined by the wall portion 120 into two spaces: space S1 on the sound source side and space S2 on the fixed side. Figure 2 As shown, the perforated plate 110 extends along the ends 120a and 120b of the sidewall portion 120. That is, the surfaces 112 and 113 of the perforated plate 110 extend along the ends 120a and 120b of the sidewall portion 120, respectively. For example, the perforated plate 110 extends parallel or substantially parallel to the ends 120a and 120b of the sidewall portion 120.

[0072] Furthermore, the perforated plate 110 is integrally connected to the side wall portion 120. Specifically, end 110a of the perforated plate 110 is integrally connected to the wall portion 121, end 110b is integrally connected to the wall portion 122, end 110c is integrally connected to the wall portion 123, and end 110d is integrally connected to the wall portion 124. That is, ends 110a, 110b, 110c, and 110d are the connecting portions of the perforated plate 110 to the wall portions 121, 122, 123, and 124, respectively.

[0073] like Figure 1 , Figure 2 , Figure 4 As shown, the membrane component 102 is mounted on the end 120a of the sidewall portion 120, covering the space S1, and is positioned opposite the perforated plate 110 from the sound source side across the space S1. Specifically, the surface 102b of the membrane component 102 is positioned opposite the surface 112 of the perforated plate 110 across the space S1. The membrane component 102 is mounted on the end 120a of the sidewall portion 120, for example, by bonding with an adhesive or by fixing with other fixing means.

[0074] The sound-absorbing structure 100 has the above-described structure. The membrane component 102 and the space S1 form a spring-mass resonant system that resonates at a specific frequency, and the perforated plate 110 and the space S2 form a Helmholtz resonator, absorbing sound from the sound source side. The resonant frequency of the spring-mass resonant system formed by the membrane component 102 and the space S1 can be adjusted by changing the areal density of the membrane component 102, the volume of the space S1, etc. For example, when the areal density of the membrane component 102 is low, the spring-mass vibration system resonates at a high frequency, and when the areal density of the membrane component 102 is high, the spring-mass vibration system resonates at a low frequency. In addition, by changing the diameter of the through holes 111 of the perforated plate 110, the arrangement (spacing) of the through holes 111, etc., the resonant frequency of the Helmholtz resonator formed by the perforated plate 110 and the space S2 can be adjusted.

[0075] As described above, the sound-absorbing structural member 101 is formed of sheet 1. Sheet 1 is, for example, the sound-absorbing structural sheet described later, and is a bendable sheet. Sheet 1 is, for example, a sheet made of corrugated paper, thick paper, or resin sheet. In addition, the material of sheet 1 is not limited to corrugated paper, thick paper, or resin sheet. Sheet 1 can also be other bendable sheets.

[0076] Next, the sound-absorbing structure 103 according to the second embodiment of the present invention will be described. Figure 5 This is a perspective view showing the simplified structure of the sound-absorbing structure 103 according to the second embodiment of the present invention. Figure 6 This is an exploded perspective view showing the simplified structure of the sound-absorbing structure 103. Figure 7 It means along Figure 5 A cross-sectional view of line BB. Hereinafter, regarding the structure of the sound-absorbing structure 103, for structures that are the same as or have the same function as the sound-absorbing structure 100 described above, the same reference numerals will be used and descriptions will be omitted; for structures that are different from the sound-absorbing structure 100, descriptions will be provided.

[0077] like Figures 5 to 7 As shown, the sound-absorbing structure 103 includes a sound-absorbing structure component 104, a membrane component 105, and a frame component 106. Figure 8 This is a perspective view showing the simplified structure of the membrane component 105. Figure 9This is a perspective view showing the simplified structure of the sound-absorbing component 104. Figure 10 This is a top view showing the simplified structure of the sound-absorbing structural component 104. Additionally, in Figure 8 The image shows the membrane component 105 as viewed from the fixed side. Figure 9 The sound-absorbing structural component 104 is shown as viewed from the fixed side.

[0078] like Figures 5 to 8 As shown, the membrane component 105 is a component with a frame-like member on the membrane component 102, having a membrane portion 107 and an edge portion 108. The membrane portion 107 is the portion corresponding to the membrane component 102, and the edge portion 108 is an annular portion extending from the end of the membrane portion 107 towards the fixed side. The membrane portion 107 has the same shape as the membrane component 102, is a flexible, thin membrane portion, and has a pair of mutually opposing surfaces 107a and 107b. Surface 107a faces the sound source side, and surface 107b faces the fixed side. The membrane portion 107 flexes in the direction facing surfaces 107a and 107b, thereby causing the membrane portion 107 to vibrate. Figure 4 , Figure 5 As shown, the membrane portion 107 is, for example, rectangular or substantially rectangular, having a pair of mutually opposing ends 107c, 107d and a pair of mutually opposing ends 107e, 107f. Ends 107e and 107f extend in directions intersecting the extending directions of ends 107c and 107d. For example, ends 107c and 107d extend in a straight or substantially straight manner, and ends 107e and 107f extend or substantially orthogonally to the extending directions of ends 107c and 107d.

[0079] like Figures 5 to 8 As shown, the edge portion 108 extends in a rectangular or generally rectangular ring shape, for example, to enclose a rectangular or generally rectangular space. Furthermore, the edge portion 108 is, for example, orthogonal or generally orthogonal to the membrane portion 107. Specifically, as... Figure 6 , Figure 8 As shown, the edge portion 108 has: edge pieces 108a and 108b, which are opposite each other across the space enclosed by the edge portion 108; and edge pieces 108c and 108d, which are opposite each other across the space enclosed by the edge portion 108. The edge portion 108 is integrally connected to the membrane portion 107, and ends 107c, 107d, 107e, and 107f are respectively the connecting portions between the membrane portion 105 and the edge pieces 108a, 108b, 108c, and 108d.

[0080] like Figure 6As shown, edge piece 108a extends from end 107c and has an end 108aa facing away from end 107c and a pair of mutually opposing ends 108ab and 108ac extending between end 107c and end 108aa. Similarly, edge piece 108b extends from end 107d and has an end 108ba facing away from end 107d and a pair of mutually opposing ends 108bb and 108bc extending between end 107d and end 108ba. In addition, edge piece 108c extends from end 107e and has an end 108ca facing away from end 107e and a pair of mutually opposing ends 108cb and 108cc extending between end 107e and end 108ca. Additionally, edge piece 108d extends from end 107f and has an end 108da facing away from end 107f and a pair of mutually facing ends 108db and 108dc extending between end 107f and end 108da. Edge pieces 108a, 108b, 108c, and 108d are, for example, as shown in... Figure 6 , Figure 8 As shown, they are rectangles or approximate rectangles, respectively. Additionally, for example, as... Figure 6 , Figure 8 As shown, the ends 108aa of edge piece 108a, 108ba of edge piece 108b, 108ca of edge piece 108c, and 108da of edge piece 108d are located on the same plane or near the same plane.

[0081] Ends 108ab and 108ac of edge piece 108a can be connected to end 108cc of edge piece 108c and end 108db of edge piece 108d, respectively, or they can be separated. Similarly, ends 108bb and 108bc of edge piece 108b can be connected to end 108cb of edge piece 108c and end 108dc of edge piece 108d, respectively, or they can be separated.

[0082] like Figures 5 to 7 As shown, the membrane component 105 covers the sound-absorbing structure component 104 from the sound source side, and is also sandwiched between the side wall portion 130 of the sound-absorbing structure component 104 (described later) and the frame component 106. For example, as... Figure 6 , Figure 7 As shown, edge pieces 108a, 108b, 108c, and 108d correspond to sidewall portions 121, 122, 123, and 124 of the sidewall portion 130, which will be described later. Specifically, for example, in the sound-absorbing structure 103, edge pieces 108a, 108b, 108c, and 108d contact the sidewall portions 121, 122, 123, and 124 from their outer peripheral sides, respectively.

[0083] Membrane component 105 is made of the same material as membrane component 102. The membrane portion 107 of membrane component 105 vibrates in the same manner as membrane component 102. Furthermore, the areal density of the membrane portion 107 of membrane component 105 is the same as that of membrane component 102, for example, 0.03 kg / m³. 2 Above and 0.3 kg / m 2 Furthermore, the areal density of the membrane portion 107 is not limited to the values ​​described above.

[0084] like Figure 6 , Figure 7 , Figure 9 , Figure 10 As shown, the sound-absorbing structural member 104 has the perforated plate 110 of the aforementioned sound-absorbing structural member 101, and also has a side wall portion 130 that is different from the side wall portion 120 of the aforementioned sound-absorbing structural member 101. The side wall portion 130 of the sound-absorbing structural member 104 differs from the side wall portion 120 of the sound-absorbing structural member 101 in that it only extends from the perforated plate 110 towards the sound source side, and does not protrude from the perforated plate 110 towards the fixed side, thus not forming a space S3 on the fixed side of the perforated plate 110. That is, in the side wall portion 130, the fixed-side ends 121b, 122b, 123b, and 124b of the wall pieces 121, 122, 123, and 124 overlap with the ends 110a, 110b, 110c, and 110d of the perforated plate 110.

[0085] Furthermore, the side wall portion 130 has support portions 131a, 131b, 132a, 132b, 133a, 133b, 134a, and 134b, which are different from the fixing portions 125a, 125b, 126a, and 126b of the side wall portion 120. For example... Figure 6 , Figure 9 , Figure 10 As shown, the support portions 131a, 131b, 132a, 132b, 133a, 133b, 134a, and 134b are in contact with the perforated plate 110, supporting the sidewall portions 121, 122, 123, and 124 on the perforated plate 110.

[0086] For example, Figure 6 , Figure 9 , Figure 10The support portions 131a and 131b shown are integrally connected to ends 121c and 121d of the wall plate 121, respectively, and extend inward (towards the space S1 side). Furthermore, the support portions 131a and 131b have ends 131aa and 131ba on the fixed side, respectively, and ends 131aa and 131ba contact the surface 112 of the perforated plate 110. Similarly, the support portions 132a and 132b are integrally connected to ends 122c and 122d of the wall plate 122, respectively, and extend inward. Furthermore, the support portions 132a and 132b have ends 132aa and 132ba on the fixed side, respectively, and ends 132aa and 132ba contact the surface 112 of the perforated plate 110. Additionally, the support portions 133a and 133b are integrally connected to ends 123c and 123d of the wall plate 123, respectively, and extend inward. Furthermore, the support portions 133a and 133b each have ends 133aa and 133ba on their fixed sides, and ends 133aa and 133ba contact the surface 112 of the perforated plate 110. Additionally, the support portions 134a and 134b are integrally connected to the ends 124c and 124d of the wall plate 124 and extend inwards. Furthermore, the support portions 134a and 134b each have ends 134aa and 134ba on their fixed sides, and ends 134aa and 134ba contact the surface 112 of the perforated plate 110.

[0087] As described above, the support portions 131a and 131b contact the surface 112 of the perforated plate 110, supporting the wall portion 121 on the perforated plate 110 and preventing the wall portion 121 from tilting inward (towards the space S1 side). Similarly, the support portions 132a and 132b contact the surface 112 of the perforated plate 110, supporting the wall portion 122 on the perforated plate 110 and preventing the side wall portion 122 from tilting inward. Furthermore, the support portions 133a and 133b contact the surface 112 of the perforated plate 110, supporting the wall portion 123 on the perforated plate 110 and preventing the wall portion 123 from tilting inward. Additionally, the support portions 134a and 134b contact the surface 112 of the perforated plate 110, supporting the wall portion 124 on the perforated plate 110 and preventing the wall portion 124 from tilting inward.

[0088] Furthermore, wall pieces 121, 122, 123, and 124 are not connected circumferentially to their adjacent counterparts. Specifically, ends 121c and 121d of wall piece 121 are not connected to or in contact with ends 124d of wall piece 124 and 124c of side wall piece 123, respectively. Similarly, ends 122c and 122d of side wall piece 122 are not connected to or in contact with ends 123d of side wall piece 123 and 124c of side wall piece 124, respectively. In addition, the support portions 131a, 131b, 132a, 132b, 133a, 133b, 134a, and 134d may or may not be in contact with the adjacent support portions among the support portions 131a, 131b, 132a, 132b, 133a, 133b, 134a, and 134d in the circumferential direction.

[0089] The frame member 106 is a component for supporting the sidewall portion 130 of the sound-absorbing structure member 104. Additionally, it is a component for fixing the membrane member 105, which covers the sound-absorbing structure member 104 from the sound source side, to the sound-absorbing structure member 104. It is capable of clamping the edge portion 108 of the membrane member 105 between itself and the sidewall portion 130 of the sound-absorbing structure member 104. The frame member 106 has a shape corresponding to the sidewall portion 130 of the sound-absorbing structure member 104, for example, as shown in the figure. Figure 5 , Figure 6 As shown, it extends in a rectangular or roughly rectangular ring shape, enclosing a rectangular or roughly rectangular space. Specifically, as... Figure 5 , Figure 6 As shown, the edge portion 108 has: frame member pieces 106a and 106b, which are portions facing each other across the space enclosed by the frame member 106; and frame member pieces 106c and 106d, which are portions facing each other across the space enclosed by the frame member 106.

[0090] For example, such as Figure 6 As shown, frame member pieces 106a, 106b, 106c, and 106d correspond to wall pieces 121, 122, 123, and 124 of the sidewall portion 130, respectively. Specifically, for example, in the sound-absorbing structure 103, frame member pieces 106a, 106b, 106c, and 106d contact the wall pieces 121, 122, 123, and 124 from the outer peripheral side via edge pieces 108a, 108b, 108c, and 108d of the edge portion 108 of the membrane member 105. In addition, as long as the frame member 106 can fix the membrane member 105 together with the side wall portion 130 of the sound-absorbing structure member 104, the frame member pieces 106a, 106b, 106c, and 106d may not all contact the wall pieces 121, 122, 123, and 124 from the outer peripheral side via the edge pieces 108a, 108b, 108c, and 108d of the edge portion 108 of the membrane member 105.

[0091] In addition, such as Figure 6 , Figure 7 As shown, the sound source side end 106e of the frame member 106, when viewed from the outer periphery in the sound-absorbing structure 103, extends in a manner that coincides with or substantially coincides with the end 120a of the sidewall portion 130 of the sound-absorbing structure member 104. The fixed side end 106f of the frame member 106 extends along end 106e. The end 106f of the frame member 106 extends, for example, parallel to or substantially parallel to end 106e. Figure 7 As shown, the width between ends 106e and 106f of the frame member 106 is greater than the width between ends 120a and 120b of the sidewall portion 130 of the sound-absorbing structure member 104. In the sound-absorbing structure 103, end 106f of the frame member 106 is located closer to the fixed side than end 120b of the sidewall portion 130 of the sound-absorbing structure member 104.

[0092] The frame member pieces 106a, 106b, 106c, and 106d of the frame member 106 can be integrally connected or joined by adhesives or the like. When the frame member pieces 106a, 106b, 106c, and 106d are joined by adhesives or the like, each of the frame member pieces 106a, 106b, 106c, and 106d has a connecting piece (not shown) for connection. The connecting piece, for example, extends circumferentially from the frame member pieces 106a, 106b, 106c, and 106d, and is the portion coated with adhesive. Alternatively, any one of the frame member pieces 106a, 106b, 106c, and 106d can be integrally connected, and frame member pieces that are not integrally connected are joined by adhesives or the like.

[0093] The frame member 106 is formed of a bendable sheet, for example, the same sheet as that used for the sound-absorbing structural members 103 and 104. However, the material of the frame member 106 is not limited to bendable sheets.

[0094] Figure 11 This is a perspective view of a modified sound-absorbing structure 103 having a frame component 106. (See attached image.) Figure 11As shown, the frame member 106 may also have fixing pieces 106g, 106h, 106i, and 106j extending from the respective ends 106aa, 106ba, 106ca, and 106da of the frame member pieces 106a, 106b, 106c, and 106d. Furthermore, the ends 106aa, 106ba, 106ca, and 106da of the frame member pieces 106a, 106b, 106c, and 106d are the ends of the fixing sides of the frame member pieces 106a, 106b, 106c, and 106d, and are part of the end 106f of the frame member 106. The fixing pieces 106g, 106h, 106i, and 106j extend, for example, along a plane. Additionally, the shapes of the fixing pieces 106g, 106h, 106i, and 106j may be various shapes corresponding to the shape of the object on which the sound-absorbing structure 103 is mounted.

[0095] like Figure 6 , Figure 7 As shown, in the sound-absorbing structure 103, the sound-absorbing structure component 104 is housed from the fixed side within the space defined by the membrane component 105. The membrane component 105 covers the sidewall portion 130 from the sound source side and the outer peripheral side. Furthermore, the frame component 106, together with the sidewall portion 130, clamps the membrane component 105, and the membrane component 105 is fixed to the sound-absorbing structure component 104. In the sound-absorbing structure 103, similarly to the sound-absorbing structure 100 described above, the membrane portion 107 of the membrane component 105 covers the space S1 and faces the perforated plate 110 from the sound source side across the space S1. Specifically, the surface 107b of the membrane portion 107 faces the surface 112 of the perforated plate 110 across the space S1.

[0096] In addition, such as Figure 7 As shown, in the sound-absorbing structure 103, the fixed side end 106f of the frame member 106 is located closer to the fixed side than the perforated plate 110, and the space S2 is divided by the frame member 106 and the perforated plate 110 at the position closer to the fixed side than the perforated plate 110.

[0097] Thus, in the sound-absorbing structure 103, a spring-mass resonance system resonating at a specific frequency is formed by the membrane component 105 and the space S1, and a Helmholtz resonator is formed by the perforated plate 110 and the space S2. Therefore, the sound-absorbing structure 103 according to the second embodiment of the present invention also performs the sound-absorbing function in the same way as the sound-absorbing structure 100 described above.

[0098] In addition, the sound-absorbing structure 103 has Figure 11In the case of the frame member 106 in the illustrated modified example, the sound-absorbing structure 103 can be mounted on the mounting object by fixing the fixing plates 106g, 106h, 106i, and 106j to the mounting object of the sound-absorbing structure 103. The fixing of the fixing plates 106g, 106h, 106i, and 106j to the mounting object can be achieved by adhesive-based fixing, screw fastening, or other fixing methods. Alternatively, through holes for fixing by screws or other fixing methods can be provided on the fixing plates 106g, 106h, 106i, and 106j.

[0099] Next, a modified example of the sound-absorbing structure component 104 of the sound-absorbing structure 103 according to the second embodiment of the present invention will be described. Figure 12 This is a perspective view of a modified example of a sound-absorbing structural component 109, which is a sound-absorbing structural component 104 serving as a sound-absorbing structural component 103. (See diagram below.) Figure 12 As shown, in a modified example of the sound-absorbing structural member 104, the side wall portion 130 of the sound-absorbing structural member 109 has support portions 135a, 135b, 136a, 136b, 137a, 137b, 138a, and 138b that are different from the support portions 131a, 131b, 132a, 132b, 133a, 133b, 134a, and 134d.

[0100] Support portions 135a and 135b are plate-like portions extending from end 121b towards the fixing side along ends 121c and 121d of the wall plate 121, respectively. Support portions 135a and 135b are integrally connected to the wall plate 121. The thickness of support portions 135a and 135b is the same as or approximately the same as the thickness of the wall plate 121. Support portions 136a and 136b have the same shape as support portions 135a and 135b, and are plate-like portions extending from end 122b towards the fixing side along ends 122c and 122d of the wall plate 122, respectively. Support portions 136a and 136b are integrally connected to the wall plate 122. The thickness of support portions 136a and 136b is the same as or approximately the same as the thickness of the wall plate 122.

[0101] Support portions 137a and 137b are plate-like portions extending inward (towards the space S1 side) from ends 123c and 123d of the wall plate 123 along the direction facing the wall plate 123. Furthermore, support portions 137a and 137b extend further towards the fixing side than the perforated plate 110. For example, support portions 137a and 137b extend towards the fixing side to the same or approximately the same position as support portions 135a and 136a. Furthermore, support portions 137a and 137b extend inward, overlapping with support portions 135a and 136a from the inside. Furthermore, support portions 137a and 137b contact the plate 110 from the outside. Support portions 137a and 137b are integrally connected to the wall plate 123. The thickness of support portions 137a and 137b is the same or approximately the same as the thickness of the wall plate 123. Support portions 138a and 138b have the same shape as support portions 137a and 137b, and are plate-like portions extending inward (towards the space S1 side) from the ends 124c and 124d of the wall plate 124 in the direction facing the side wall portion 124. Furthermore, support portions 138a and 138b extend further towards the fixing side than the perforated plate 110. For example, support portions 138a and 138b extend towards the fixing side to the same or approximately the same position as support portions 135b and 136b. Additionally, support portions 138a and 138b extend inward, overlapping with support portions 135b and 136b from the inside. Furthermore, support portions 138a and 138b contact the plate 110 from the outside. Support portions 138a and 138b are integrally connected to the side wall portion 124. The thicknesses of the support portions 138a and 138b are the same as or approximately the same as the thickness of the wall portion 124.

[0102] As described above, support portions 138b and 137a overlap with support portions 135a and 135b from the inside, respectively, and contact the perforated plate 110 from the outside. Thus, the end 121c side of the wall piece 121 is supported from the inside by support portions 135a and 138b, and the end 121d side of the wall piece 121 is supported from the inside by support portions 135b and 137a. Furthermore, support portions 137b and 138a overlap with support portions 136a and 136b from the inside, respectively, and contact the perforated plate 110 from the outside. Thus, the end 122c side of the wall piece 122 is supported from the inside by support portions 136a and 137b, and the end 122d side of the wall piece 122 is supported from the inside by support portions 136b and 138a. In this way, the wall panels 121 and 122 are supported, which can prevent the wall panels 121 and 122 from tilting inward.

[0103] Furthermore, in the sound-absorbing structure 103, support members 137a, 137b, 138a, and 138b respectively contact the frame member 106. Therefore, the wall panels 123 and 124 are supported by the support members 137a, 137b, 138a, and 138b and the frame member 106, which prevents the wall panels 123 and 124 from tilting inward.

[0104] In the sound-absorbing structure 103 using the sound-absorbing structural component 109, for example, the fixed-side ends 135aa, 135ba, 136aa, 136b, 137a, 137b, 138a, and 138b of each of the support components 135a, 135b, 136a, 136b, 137a, 137ba, 138aa, and 138ba overlap with the fixed-side end 106f of the frame component 106. That is, the width of the support components 135a, 135b, 136a, 136b, 137a, 137b, 138a, and 138b protruding from the perforated plate 110 determines the width in the height direction of the space S2.

[0105] Next, the sound-absorbing structural sheet 1 according to the first embodiment of the present invention will be described. The sound-absorbing structural sheet 1 (hereinafter also referred to as sheet 1) is a bendable sheet that forms the sound-absorbing structural member 101 of the sound-absorbing structural member 100 according to the first embodiment of the present invention described above. Figure 13 This is a top view of image 1. (For example...) Figure 13 As shown, sheet 1 has a specific shape and has mutually opposing surfaces, namely surface 1a and back surface 1b. Sheet 1 is formed from a sheet material. The sheet material forming sheet 1 is, for example, a sheet made of corrugated paper, thick paper, or resin. However, the sheet material forming sheet 1 is not limited to sheets made of corrugated paper, thick paper, or resin. The sheet material forming sheet 1 can also be other sheets that can be bent. Sheet 1 is integrally formed from a sheet material, for example, having a uniform or substantially uniform thickness. Sheet 1 is, for example, formed by cutting a sheet material of uniform or substantially uniform thickness. In the following description, sheet 1 is a sheet material made of corrugated paper.

[0106] like Figure 13As shown, the sheet 1 includes: a perforated plate portion 10, forming a perforated plate 110 having a plurality of through holes 111; a pair of first sidewall portions 20 and 30, forming wall portions 121 and 122, which are a pair of opposing first sidewalls; and a pair of second sidewall portions 40 and 50, forming wall portions 123 and 124, which are a pair of opposing second sidewalls. The perforated plate portion 10 has: first end portions 11 and 12, which are a pair of opposite ends; and second end portions 13 and 14, which are a pair of opposite ends extending in a direction intersecting the first end portions 11 and 12. The pair of first sidewall portions 20 and 30 are respectively connected to the pair of first end portions 11 and 12 of the perforated plate portion 10 in a bendable manner. The pair of second sidewall portions 40 and 50 are respectively connected to the pair of second end portions 13 and 14 of the perforated plate portion 10 in a bendable manner. A pair of first sidewall portions 20 and 30 are respectively bendable so that the perforated plate 110 is positioned between a pair of ends 121a, 121b and a pair of ends 122a, 122b of each of the wall portions 121 and 122 in the direction facing the perforated plate 110. A pair of second sidewall portions 40 and 50 are respectively bendable so that the perforated plate 110 is positioned between a pair of ends 123a, 123b and a pair of ends 124a, 124b of each of the wall portions 123 and 124 in the direction facing the perforated plate 110. The structure of the plate 1 will be described in detail below. In addition, for ease of explanation, Figure 13 The diagram shows the x-axis used to indicate direction and the y-axis, which is orthogonal to the x-axis.

[0107] like Figure 13 As shown, the perforated plate portion 10 has the form of a perforated plate 110 with a sound-absorbing structural member 101, and has ends 110a, 110b, 110c, 110d, a plurality of through holes 111, and surfaces 112, 113. Ends 110a and 110b are respectively included in the first end portions 11 and 12 of the perforated plate portion 10, and ends 110c and 110d are respectively included in the second end portions 13 and 14 of the perforated plate portion. Figure 13 As shown, the perforated plate portion 10 is, for example, a rectangular or substantially rectangular plate. The first ends 11 and 12 extend in a straight or substantially straight line along the x-axis, and the second ends 13 and 14 are orthogonal or substantially orthogonal to the first ends 11 and 12 and extend in a straight or substantially straight line along the y-axis.

[0108] like Figure 13As shown, the first sidewall portions 20 and 30 each have a plurality of sidewall plates 21 and 31 extending along the first ends 11 and 12 (x-axis direction). The plurality of sidewall plates 21 and 31 extend outward from the first ends 11 and 12, respectively. Similarly, the second sidewall portions 40 and 50 each have a plurality of sidewall plates 41 and 51 extending along the second ends 13 and 14 (y-axis direction). The plurality of sidewall plates 41 and 51 extend outward from the second ends 13 and 14, respectively. "Outer side" refers to the side away from the perforated plate portion 10 in the x-axis or y-axis direction. The sidewall plates 21, 31, 41, and 51 are, for example, rectangular or substantially rectangular plates. In each of the first sidewall portions 20 and 30, the plurality of sidewall plates 21 and 31 are connected in a bendable manner in the direction (y-axis direction) extending from the first ends 11 and 12 of the first sidewall portions 20 and 30. In each of the second sidewall portions 40 and 50, a plurality of sidewall plates 41 and 51 are connected in a bendable manner in the direction (x-axis direction) extending from the second ends 13 and 14 of the second sidewall portions 40 and 50.

[0109] The first sidewall portion 20 is the same as or substantially the same as the first sidewall portion 30. Hereinafter, the structure of the first sidewall portion 20 will be primarily described, but the description of the first sidewall portion 20 can be applied to the structure of the first sidewall portion 30 and can serve as an explanation of the first sidewall portion 30. Similarly, the second sidewall portion 40 is the same as or substantially the same as the second sidewall portion 50. Hereinafter, the structure of the second sidewall portion 40 will be primarily described, but the description of the second sidewall portion 40 can be applied to the structure of the second sidewall portion 50 and can serve as an explanation of the second sidewall portion 50.

[0110] The first sidewall portion 20 has the same or approximately the same width in a direction orthogonal to the direction extending from the first end portion 11 (y-axis direction). The plurality of sidewall plates 21 of the first sidewall portion 20 include: a first inner wall plate 22, which is bendable in one direction facing the perforated plate portion 10, specifically in the direction facing surface 113 (the fixed side in the sound-absorbing structure member 101) (hereinafter also referred to as the fixed side); and an outer wall plate 23, which is bendable relative to the first inner wall plate 22 in another direction facing the perforated plate portion 10, specifically in the direction facing surface 112 (the sound source side in the sound-absorbing structure member 101) (hereinafter also referred to as the sound source side). The first inner wall plate 22 is connected to the first end portion 11. The width h12 of the outer wall plate 23 in the extending direction (y-axis direction) of the first sidewall portion 20 is greater than the width h11 of the first inner wall plate 22 in the extending direction. Figure 13As shown, the extending direction of the first sidewall portion 20 is, for example, a direction orthogonal to the first end portion 11 (y-axis direction), and the width h11 of the first inner wall panel 22 and the width h12 of the outer wall panel 23 are their respective widths in a direction orthogonal to the first end portion 11. The width h11 of the first inner wall panel 22 is the same or approximately the same throughout the extending direction (x-axis direction). Similarly, the width h12 of the outer wall panel 23 is the same or approximately the same throughout the extending direction (x-axis direction).

[0111] As described above, width h11 is a smaller value than width h12. Therefore, in the sound-absorbing structural member 101 formed from sheet 1, the perforated plate 110 is located between end 120a and end 120b in the height direction of the sidewall portion 120. Furthermore, the height direction is the direction between the sound source side and the fixed side, for example, a direction orthogonal to surface 112 or surface 113 of the perforated plate 110. Width h11 determines the width of the space S2 of the sound-absorbing structural member 101 in the height direction. Additionally, width h11 and width h12 (h12-h11) determine the width of the space S1 of the sound-absorbing structural member 101 in the height direction. Furthermore, width h12 determines the width of the sound-absorbing structural member 101 (sidewall portion 120) in the height direction. Therefore, by adjusting the value of width h11, the resonant frequency of the spring-mass vibration system of the sound-absorbing structure 100 can be adjusted. In addition, by adjusting the values ​​of width h11 and width h12, the resonant frequency of the Helmholtz resonator of the sound-absorbing structure 100 can be adjusted.

[0112] Specifically, the first end portion 11 has, for example, a structure that allows the first sidewall portion 20 to be easily bent toward the fixed side relative to the perforated plate portion 10. For example, as a bendable structure, the first end portion 11 has a groove recessed toward the surface 1a on the back side 1b. In addition to the groove on the back side 1b, as a bendable structure, the first end portion 11 may also have a groove recessed toward the back side 1b at a position on the surface 1a opposite to the groove on the back side 1b. Alternatively, the first end portion 11 may only have a groove recessed toward the back side 1b on the surface 1a to serve as a bendable structure. Furthermore, the bendable structure is not limited to the groove described above. Hereinafter, such a bendable structure will be referred to as a crease structure.

[0113] Additionally, for example, such as Figure 13As shown, the first sidewall portion 20 has a second inner wall plate 24, which is one of a plurality of sidewall plates 21, capable of bending relative to the outer wall plate 23 toward the sound source side. The width h13 of the second inner wall plate 24 in the extending direction is smaller than the width h12 of the outer wall plate 23. The width h13 of the second inner wall plate 24 in the extending direction is, for example, the size at which the second inner wall plate 24 contacts the surface 112 of the perforated plate 110 when the plurality of first sidewall plates 21 of the first sidewall portion 20 are bent, as described later. The width h13 of the second inner wall plate 24 is the same or approximately the same in the entire extending direction (x-axis direction).

[0114] Additionally, the first sidewall portion 20 has end panels 25 and 26 as one of a plurality of sidewall panels 21. End panel 25 extends between the first inner wall panel 22 and the outer wall panel 23, and end panel 26 extends between the outer wall panel 23 and the second inner wall panel 24. Furthermore, end panel 25 is connected to the first inner wall panel 22 via a fold structure 27a and to the outer wall panel 23 via a fold structure 27b. Fold structure 27a allows end panel 25 to bend relative to the first inner wall panel 22 towards the sound source side, and fold structure 27b allows the outer wall panel 23 to bend relative to end panel 25 towards the sound source side. Furthermore, end panel 26 is connected to the outer wall panel 23 via a fold structure 27c and to the second inner wall panel 24 via a fold structure 27d. Fold structure 27c allows end panel 26 to bend relative to the outer wall panel 23 towards the sound source side, and fold structure 27d allows the second inner wall panel 24 to bend relative to end panel 26 towards the sound source side.

[0115] Each sidewall panel 21 of the first sidewall portion 20, namely the first inner wall panel 22, the outer wall panel 23, the second inner wall panel 24, and the end panels 25 and 26, is rectangular or approximately rectangular in shape. The first sidewall portion 20 is the part of the sound-absorbing structural member 101 that forms the wall piece 121 of the sidewall portion 120. Specifically, the first inner wall panel 22 forms the inner part of the dividing space S2 of the wall piece 121, the outer wall panel 23 forms the outer part of the wall piece 121, and the second inner wall panel 24 forms the inner part of the dividing space S1 of the wall piece 121. In addition, the end panel 25 forms the end 121b of the wall piece 121, and the end panel 26 forms the end 121a of the wall piece 121.

[0116] like Figure 13As shown, the first sidewall portion 30 has sidewall panels 31, 32, 33, 34, 35, 36, 37a, 37b, 37c, and 37d corresponding to the sidewall panels 21, 22, 23, 24, 25, 26, 27a, 27b, 27c, and 27d of the first sidewall portion 20. The first sidewall portion 30 is the portion of the wall piece 122 forming the sidewall portion 120 of the sound-absorbing structure member 101. The first inner wall panel 32 forms the inner side of the dividing space S2 of the wall piece 122, the outer wall panel 33 forms the outer side of the wall piece 122, and the second inner wall panel 34 forms the inner side of the dividing space S1 of the wall piece 122. In addition, end panel 35 forms end 122b of wall piece 122, and end panel 36 forms end 122a of wall piece 122.

[0117] The second sidewall portion 40 has the same or approximately the same width in a direction orthogonal to the direction extending from the second end portion 13 (x-axis direction). The second sidewall portion 40 includes a plurality of sidewall plates 41: a first inner wall plate 42, capable of bending in one direction, specifically the fixed side, toward the direction facing the perforated plate portion 10; and an outer wall plate 43, capable of bending relative to the first inner wall plate 42 in another direction, specifically the sound source side, toward the direction facing the perforated plate portion 10. The first inner wall plate 42 is connected to the second end portion 13. The width h22 of the outer wall plate 43 in the extending direction of the second sidewall portion 40 is greater than the width h21 of the first inner wall plate 42 in the extending direction. Figure 13 As shown, the extending direction of the second sidewall portion 40 is, for example, a direction orthogonal to the second end portion 13 (x-axis direction), and the width h21 of the first inner wall plate 42 and the width h22 of the outer wall plate 43 are their respective widths in a direction orthogonal to the second end portion 13. The width h21 of the first inner wall plate 42 and the width h22 of the outer wall plate 43 are the same as or approximately the same as the width h11 of the first inner wall plate 22 and the width h12 of the outer wall plate 23 of the first sidewall portion 20, respectively.

[0118] Width h21 is the same as or approximately the same as width h11, and width h22 is the same as or approximately the same as width h12. Therefore, as described above, in the sound-absorbing structural member 101 formed from sheet 1, the perforated plate 110 is located between end 120a and end 120b in the height direction of the sidewall portion 120. Width h21, like width h11, determines the width in the height direction of the space S2 of the sound-absorbing structural member 101. Furthermore, widths h21 and h22 (h22-h21), like widths h11 and h12 (h12-h11), determine the width in the height direction of the space S1 of the sound-absorbing structural member 101. Similarly, width 22, like width h12, determines the width in the height direction of the sound-absorbing structural member 101 (sidewall portion 120). Therefore, by adjusting the values ​​of width h11 and width h21, the resonant frequency of the spring-mass vibration system of the sound-absorbing structure 100 can be adjusted. In addition, by adjusting the values ​​of width h11 and width h12 and the values ​​of width h21 and width h22, the resonant frequency of the Helmholtz resonator of the sound-absorbing structure 100 can be adjusted.

[0119] Specifically, for example, the second end portion 13 has the aforementioned crease structure that allows the second sidewall portion 40 to be easily bent toward the sound source side relative to the perforated plate portion 10. The second end portion 13 has a crease structure on the back side 1b side or has crease structures on the surface side 1a side and the back side 1b side facing away from each other. The second end portion 13 may also have a crease structure only on the surface side 1a side.

[0120] In addition, for example, Figure 13 As shown, the second sidewall portion 40 has a second inner wall panel 44, which is one of a plurality of sidewall panels 41, capable of bending relative to the outer wall panel 43 toward the sound source side. The width h23 of the second inner wall panel 44 in the extending direction is smaller than the width h22 of the outer wall panel 43. The width h23 of the second inner wall panel 44 in the extending direction is, for example, the size at which the second inner wall panel 44 contacts the surface 112 of the perforated plate 110 when the plurality of first sidewall panels 41 of the second sidewall portion 40 are bent, as described later.

[0121] Additionally, the second sidewall portion 40 has end panels 45 and 46 as one of a plurality of sidewall panels 41. End panel 45 extends between the first inner wall panel 42 and the outer wall panel 43, and end panel 46 extends between the outer wall panel 43 and the second inner wall panel 44. Furthermore, end panel 45 is connected to the first inner wall panel 42 via a fold structure 47a and to the outer wall panel 43 via a fold structure 47b. Fold structure 47a allows end panel 45 to bend relative to the first inner wall panel 42 towards the sound source side, and fold structure 47b allows the outer wall panel 43 to bend relative to end panel 45 towards the sound source side. Furthermore, end panel 46 is connected to the outer wall panel 43 via a fold structure 47c and to the second inner wall panel 44 via a fold structure 47d. Fold structure 47c allows end panel 46 to bend relative to the outer wall panel 43 towards the sound source side, and fold structure 47d allows the second inner wall panel 44 to bend relative to end panel 46 towards the sound source side.

[0122] Each sidewall panel 41 of the second sidewall portion 40, namely the first inner wall panel 42, the outer wall panel 43, the second inner wall panel 44, and the end panels 45 and 46, is rectangular or substantially rectangular in shape. The second sidewall portion 40 is the portion of the wall piece 123 forming the sidewall portion 120 of the sound-absorbing structural member 101. Specifically, the first inner wall panel 42 forms the inner part of the dividing space S2 of the wall piece 123, the outer wall panel 43 forms the outer part of the wall piece 123, and the second inner wall panel 44 forms the inner part of the dividing space S1 of the wall piece 123. In addition, the end panel 45 forms the end 123b of the wall piece 123, and the end panel 46 forms the end 123a of the wall piece 123.

[0123] like Figure 13 As shown, the second sidewall portion 50 has sidewall panels 51, 52, 53, 54, 55, 56, and 57a, 57b, 57c, and 57d corresponding to the sidewall panels 41, 42, 43, 44, 45, 46, 47a, 47b, 47c, and 47d of the second sidewall portion 40, respectively. The second sidewall portion 50 is the portion of the wall piece 124 forming the sidewall portion 120 of the sound-absorbing structure member 101. The first inner wall panel 52 forms the inner side of the dividing space S2 of the wall piece 124, the outer wall panel 53 forms the outer side of the wall piece 124, and the second inner wall panel 54 forms the inner side of the dividing space S1 of the wall piece 124. In addition, end panel 55 forms end 124b of wall piece 124, and end panel 56 forms end 124a of wall piece 124.

[0124] In addition, such as Figure 13As shown, the second sidewall portion 40 has a fixing portion 48 for fixing the second sidewall portion 40 to the first sidewall portions 20 and 30. Similarly, the second sidewall portion 50 has a fixing portion 48 for fixing the second sidewall portion 50 to the first sidewall portions 20 and 30. The fixing portions 48 constitute the fixing portions 125a, 125b, 126a, and 126b of the sound-absorbing structural member 101. In the second sidewall portion 40, the fixing portion 48 can fix the second sidewall portion 40 to the first sidewall portion 20 such that the end 123c of the wall piece 123 extending in the direction of the second end portion 13 faces the end 121d of the adjacent wall piece 121 extending in the direction of the first end portion 11. In addition, the fixing part 48 can fix the second side wall part 40 to the first side wall part 30 so that the end 123d of the wall piece 123 along the extension direction of the second end 13 is opposite to the end 122c of the adjacent wall piece 122 along the extension direction of the first end 12.

[0125] Furthermore, in the second sidewall portion 50, the fixing portion 48 can fix the second sidewall portion 50 to the first sidewall portion 30, such that the end 124c of the wall piece 124 extending in the direction of the second end 14 faces the end 122d of the adjacent wall piece 122 extending in the direction of the first end 12. Additionally, the fixing portion 48 can fix the second sidewall portion 50 to the first sidewall portion 20, such that the end 124d of the wall piece 124 extending in the direction of the second end 14 faces the end 121c of the adjacent wall piece 121 extending in the direction of the first end 11.

[0126] Specifically, for example, such as Figure 13 As shown, in the second sidewall portion 40, the fixing portion 48 has a first fixing portion 48a and a second fixing portion 48b. The first fixing portion 48a extends from a pair of ends 43a and 43b of the outer wall panel 43 along the direction of the second end portion 13. The second fixing portion 48b extends from a pair of ends 44a and 44b of the second inner wall panel 44 along the direction of the second end portion 13. The first fixing portion 48a has a main body portion 48aa and claw portions 48ab and 48ac extending from the main body portion 48aa. Claw 48ab extends in the direction along the second end portion 13, and claw 48ac extends in a direction orthogonal to the second end portion 13. The main body portion 48aa can be bent relative to the outer wall panel 43 towards the sound source side, and the claw portion 48ab can be bent relative to the main body portion 48aa towards the sound source side. The second fixing portion 48b has an inwardly recessed portion 48ba.

[0127] The main body 48aa and claw 48ab of the first fixing part 48a are respectively formed such that, during the assembly of the sound-absorbing structural component 101 (described later), the claw 48ab can enter the slit 22a of the first inner wall plate 22 of the first side wall part 20 or the slit 32a of the first inner wall plate 32 of the second side wall part 30. Furthermore, the main body 48aa and claw 48ac of the first fixing part 48a are respectively formed such that, during the assembly of the sound-absorbing structural component 101 (described later), the claw 48a can be received in the recess 48ba of the second fixing part 48b of the same fixing part 48.

[0128] The second sidewall portion 50 also has a fixing portion 48. That is, the first fixing portion 48a extends from a pair of ends 53a and 53b of the outer wall panel 53 along the direction of the second end portion 14. In addition, the second fixing portion 48b extends from a pair of ends 54a and 54b of the second inner wall panel 54 along the direction of the second end portion 14.

[0129] In addition, such as Figure 13 As shown, in the sound-absorbing structural member 101, recesses 24c and 24d for accommodating the fixing portion 48 are formed at the ends 24a and 24b of the second inner wall plate 24 of the first side wall portion 20. Similarly, in the sound-absorbing structural member 101, recesses 34c and 34d for accommodating the fixing portion 48 are formed at the ends 34a and 34b of the second inner wall plate 34 of the first side wall portion 30. Furthermore, ends 24a and 24b and ends 34a and 34b are the ends of the second inner wall plates 24 and 34 along the direction of the first ends 11 and 12, respectively.

[0130] In addition, such as Figure 13 As shown, each of the ends 24a and 24b of the second inner wall plate 24 of the first side wall portion 20 has a protrusion 24e and 24f protruding in the direction along the first end 11, formed on the outer side of the recesses 24c and 24d. Similarly, each of the ends 34a and 34b of the second inner wall plate 34 of the first side wall portion 30 has a protrusion 34e and 34f protruding in the direction along the first end 12, formed on the outer side of the recesses 34c and 34d. Additionally, as... Figure 13 As shown, slits 44c and 44d are formed on the outer sides of the ends 44a and 44b of the second inner wall plate 44 of the second side wall portion 40. Protrusions 34f and 24e can be accommodated in the slits 44c and 44d. Similarly, slits 54c and 54d are formed on the outer sides of the ends 54a and 54b of the second inner wall plate 54 of the second side wall portion 50. Protrusions 24f and 34e can be accommodated in the slits 54c and 54d.

[0131] Furthermore, the crease structures at the first ends 11 and 12, the crease structures at the second ends 13 and 14, and the crease structures 27a, 27b, 27c, 27d, 37a, 37b, 37c, and 37d can also be bent in the opposite direction to the aforementioned direction. In this case, the first inner wall panels 22, 32, 42, and 52 divide space S1 in the sound-absorbing structure member 101, and the second inner wall panels 24, 34, 44, and 54 divide space S2 in the sound-absorbing structure member 101. In addition, end panels 25 and 26 respectively form ends 121a and 121b of side wall pieces 121, end panels 35 and 36 respectively form ends 122a and 122b of side wall pieces 122, end panels 45 and 46 respectively form ends 123a and 123b of side wall pieces 123, and end panels 55 and 56 respectively form ends 124a and 124b of side wall pieces 124.

[0132] The sheet 1 has the structure described above, with each part bent to form a sound-absorbing structural component 101. Figures 14 to 18 This diagram illustrates a portion of the bending process of the sheet 1 used to form the sound-absorbing structural component 101. In the bending process of the sheet 1 used to form the sound-absorbing structural component 101, each bend is primarily a 90° or approximately 90° bend. Furthermore, the angle of each bend is not limited to 90°.

[0133] Regarding the formation of the sound-absorbing structural component 101, specifically, in the first side wall portion 20, the first inner wall plate 22 is bent outwards according to the crease structure of the first end portion 11 (see reference). Figure 14 Furthermore, each side panel 23 to 26 is bent inwards according to the crease construction 27a to 27d (see reference). Figures 15 to 18 In the first sidewall portion 30, the first inner wall panel 32 is bent outward according to the fold structure of the first end 12, and each sidewall panel 33 to 36 is bent inward according to the fold structures 37a to 37d, forming a wall piece 122 of the sidewall portion 120. In the second sidewall portion 40, the first inner wall panel 42 is bent outward according to the fold structure of the second end 13, and each sidewall panel 43 to 46 is bent inward according to the fold structures 47a to 47d, forming a wall piece 123 of the sidewall portion 120. In the second sidewall portion 50, the first inner wall panel 52 is bent outward according to the fold structure of the second end 14, and each sidewall panel 53 to 56 is bent inward according to the fold structures 57a to 57d, forming a wall piece 124 of the sidewall portion 120. Additionally, the first inner wall plates 22, 32, and 42 are bent inward relative to the perforated plate portion 10 to form the perforated plate 110 (see reference). Figure 14 ).

[0134] Furthermore, during the formation of wall panels 121, 122, 123, and 124, in the second side wall portion 40, the first inner wall plate 42 is bent outward relative to the perforated plate portion 10, and the end panel 45 is bent inward relative to the first inner wall plate 42. After the outer wall plate 43 is bent inward relative to the end panel 45, the claw portion 48ab of the first fixing portion 48a of the fixing portion 48 on the end 43b side is bent inward relative to the main body portion 48aa (see reference). Figure 15 When the main body 48aa bends inward relative to the outer wall panel 43 (refer to...) Figure 16 The claw portion 48ab is received in the slit 22a of the first inner wall plate 22, which is bent outward relative to the perforated plate portion 10 in the first wall portion 20 (see reference). Figure 16 Thus, the first inner wall panel 22, the first inner wall panel 42, the end panel 45, and the outer wall panel 43 are fixed to each other. Similarly, the claw portion 48ab of the first fixing portion 48a of the fixing portion 48 on the end 43a side is received in the slit 32a of the first inner wall panel 32. Thus, the first inner wall panel 32, the first inner wall panel 42, the end panel 45, and the outer wall panel 43 are fixed to each other.

[0135] Furthermore, in the second side wall portion 40, the end panel 46 is bent inward relative to the outer wall panel 43, and the second inner wall panel 44 is bent inward relative to the end panel 46. When the second fixing portion 48b of the fixing portion 48 on the end 43b side is bent inward relative to the second inner wall panel 44, the claw portion 48ab is received in the slit 22a of the first inner wall panel 22, and the claw portion 48ac of the first fixing portion 48a is received in the recess 48ba of the second fixing portion 48b (see reference). Figure 16 Thus, in the fixing part 48 on the end 43b side, the first fixing part 48a and the second fixing part 48b engage, and the first inner wall plate 22, the end plate 46, and the second inner wall plate 44 are fixed to each other. Similarly, in the fixing part 48 on the end 43a side, the claw part 48ab of the first fixing part 48a, which is received in the slit 32a of the first inner wall plate 32, and the claw part 48ac of the first fixing part 48a, which is received in the recess 48ba of the second fixing part 48b, are fixed to each other.

[0136] Similarly to the second sidewall portion 40, the claw portion 48ab of the first fixing portion 48a of the fixing portion 48 on the end 53a side of the outer wall plate 53 of the second side end 50 is received in the slit 22a of the first inner wall plate 22, and the claw portion 48ab of the first fixing portion 48a of the fixing portion 48 on the end 53b side of the outer wall plate 53 of the second side end 50 is received in the slit 32a of the first inner wall plate 32. Thus, the first inner wall plate 22, the first inner wall plate 52, the end plate 55, and the outer wall plate 53 are fixed to each other, and the first inner wall plate 32, the first inner wall plate 52, the end plate 55, and the outer wall plate 53 are also fixed to each other.

[0137] Similarly, in the fixing portion 48 on the end 53a side of the outer wall plate 53 of the second side end 50, the claw portion 48ac of the first fixing portion 48a is received within the recess 48ba of the second fixing portion 48b. Likewise, in the fixing portion 48 on the end 53b side of the outer wall plate 53 of the second side end 50, the claw portion 48ac of the first fixing portion 48a is received within the recess 48ba of the second fixing portion 48b. Thus, the first inner wall plate 22, the end panel 56, and the second inner wall plate 54 are mutually fixed, and the first inner wall plate 32, the end panel 56, and the second inner wall plate 54 are mutually fixed.

[0138] Furthermore, when the second inner wall plates 44 and 54 of the second side wall portions 40 and 50 bend inward relative to the first side wall portions 20 and 30 that are bent to form wall pieces 121 and 122 respectively, the protrusions 24e, 24f, 34e, and 34f are received in the corresponding slits 44d, 54c, 44c, and 54d (see reference). Figure 17 , 18 Thus, the second inner wall panels 24, 34, 44, and 54 are fixed to each other. Furthermore, in this state, the front ends of each of the second inner wall panels 24, 34, 44, and 54 face the surface (surface 1a) of the perforated plate portion 10. For example, the front ends of each of the second inner wall panels 24, 34, 44, and 54 are in contact with the surface (surface 1a) of the perforated plate portion 10.

[0139] As described above, sound-absorbing structural component 101 is formed by bending various parts of sheet 1 from sheet 1.

[0140] Thus, the sound-absorbing structural member 101 can be formed by bending the sheet-like sound-absorbing structural member 1. Therefore, the sound-absorbing structural member 101 can be stored in the form of the sheet-like sound-absorbing structural member 1. Therefore, the sound-absorbing structural member 101 can reduce the space required for storage.

[0141] As described above, the sound-absorbing structural component 101 and the sound-absorbing structural sheet 1 according to the first embodiment of the present invention can suppress large volume during storage.

[0142] Furthermore, by combining sheet 1 with the membrane component 102 of the aforementioned sound-absorbing structure 100, a sheet assembly for sound-absorbing structure can be formed. The sheet assembly for sound-absorbing structure can also reduce its large volume during storage.

[0143] Next, the sound-absorbing structural sheet 2 according to the second embodiment of the present invention will be described. In addition, in the description of the sound-absorbing structural sheet 2, the same reference numerals are used for structures that are the same as or have the same function as the sheet 1 described above, and their descriptions are omitted.

[0144] The sound-absorbing structure piece 2 (hereinafter also referred to as piece 2) is a bendable piece that forms the sound-absorbing structure component 104 of the sound-absorbing structure 103 according to the second embodiment of the present invention described above. Figure 19 This is a top view of image 2. (For example...) Figure 19 As shown, sheet 2 has a specific shape and has mutually opposing surfaces, namely surface 2a and back surface 2b. Sheet 2 is formed from the sheet material that forms sheet 1. Sheet 2 is integrally formed from the sheet material, for example, having a uniform or substantially uniform thickness. Sheet 2 is formed, for example, by cutting a sheet material of uniform or substantially uniform thickness. In the following description, sheet 2 is a sheet made of corrugated paper.

[0145] like Figure 19 As shown, sheet 2, like sheet 1, includes a perforated plate portion 10, first sidewall portions 20 and 30, and second sidewall portions 40 and 50. The first sidewall portions 20 and 30 respectively form wall portions 121 and 122 of the sidewall portion 130 of the sound-absorbing structural member 104, and the second sidewall portions 40 and 50 respectively form wall portions 123 and 124 of the sidewall portion 130 of the sound-absorbing structural member 104. The first sidewall portions 20 and 30 are connected to the first ends 11 and 12 of the perforated plate portion 10 in a bendable manner. Furthermore, the second sidewall portions 40 and 50 are connected to the second ends 13 and 14 of the perforated plate portion 10 in a bendable manner. The first sidewall portions 20 and 30 can be bent in the direction facing the perforated plate 110. Furthermore, the second sidewall portions 40 and 50 can be bent in the direction facing the perforated plate 110. The structure of sheet 2 will be described in detail below. Furthermore, for ease of explanation, in... Figure 19 The diagram shows the x-axis used to indicate direction and the y-axis, which is orthogonal to the x-axis.

[0146] like Figure 19 As shown, in the perforated plate portion 10 of piece 2, the first end 11 is not connected to the second ends 13 and 14, and similarly, the first end 12 is not connected to the second ends 13 and 14. The width between the first ends 11 and 12 is shorter than the width between the second ends 13 and 14, and the width between the second ends 13 and 14 is shorter than the width between the first ends 11 and 12.

[0147] The first sidewall portion 20 is the same as or substantially the same as the first sidewall portion 30. Hereinafter, the structure of the first sidewall portion 20 will be primarily described, but the description of the first sidewall portion 20 can be applied to the structure of the first sidewall portion 30 and can serve as an explanation of the first sidewall portion 30. Similarly, the second sidewall portion 40 is the same as or substantially the same as the second sidewall portion 50. Hereinafter, the structure of the second sidewall portion 40 will be primarily described, but the description of the second sidewall portion 40 can be applied to the structure of the second sidewall portion 50 and can serve as an explanation of the second sidewall portion 50.

[0148] like Figure 19As shown, the first sidewall portion 20 has a sidewall plate 21 connected to the first end portion 11, which can be bent relative to the perforated plate portion 10 toward the sound source side. The sidewall plate 21 is a rectangular or substantially rectangular plate with ends 21a, 21b, and 21c. End 21a is the end of the sidewall plate 21 facing away from the first end portion 11, and ends 21b and 21c are the ends of the sidewall plate 21 in the extending direction (x-axis direction). The width h31 of the sidewall plate 21 is the same or substantially the same in the entire extending direction (x-axis direction). The width h31 of the sidewall plate 21 is the width between the first end portion 11 and end 21a in the direction orthogonal to the extending direction of the sidewall plate 21 (y-axis direction).

[0149] In addition, such as Figure 19 As shown, the first sidewall portion 20 has a support piece 28, which constitutes the support portions 131a and 131b of the sound-absorbing structural member 104 supporting the sidewall panel 21. The support pieces 28 extend from the ends 21b and 21c of the sidewall panel 21 in opposite directions along the extending direction (x direction) of the sidewall panel 21. The support pieces 28 are connected to the sidewall panel 21 in a manner that allows them to be bent relative to the sidewall panel 21 towards the sound source side. The end 28a of the support piece 28 in the extending direction (x direction) faces inward and extends in a direction intersecting the extending direction of the sidewall panel 21. For example, the end 28a is inclined at 45° or approximately 45° relative to the extending direction of the first end portion 12. The end 28a of the support piece 28 is bent by the sidewall panel 21 and the support piece 28 to contact the perforated plate portion 10.

[0150] like Figure 19 As shown, the first sidewall portion 30 has a sidewall plate 31 corresponding to the sidewall plate 21 of the first sidewall portion 20. Furthermore, the first sidewall portion 30, like the first sidewall portion 20, has a support plate 28. The support plate 28 of the first sidewall portion 30 constitutes the support portions 132a and 132b of the sound-absorbing structural member 104.

[0151] like Figure 19 As shown, the second sidewall portion 40 has a sidewall plate 41 connected to the second end portion 13, which can be bent relative to the perforated plate portion 10 toward the sound source side. The sidewall plate 41 is a rectangular or substantially rectangular plate with ends 41a, 41b, and 41c. End 41a is the end of the sidewall plate 41 facing away from the second end portion 13, and ends 41b and 41c are the ends of the sidewall plate 41 in the extending direction (y-axis direction). The width h32 of the sidewall plate 41 is the same or substantially the same in the entire extending direction (y-axis direction). The width h32 of the sidewall plate 41 is the width between the second end portion 13 and end 41a in the direction orthogonal to the extending direction of the sidewall plate 41 (y-axis direction).

[0152] In addition, such as Figure 19As shown, the second sidewall portion 40 has a support piece 28, which constitutes the support portions 133a and 133b of the sound-absorbing structural member 104 supporting the sidewall panel 41. The support pieces 28 extend from the ends 41b and 41c of the sidewall panel 41 in opposite directions in the extending direction (y-axis direction) of the sidewall panel 41. The support pieces 28 are connected to the sidewall panel 4 in a manner that allows them to be bent relative to the sidewall panel 4 towards the sound source side. The end 28a of the support piece 28 in the extending direction (y-axis direction) faces inward and extends in a direction intersecting the extending direction of the sidewall panel 4. For example, the end 28a is inclined at 45° or approximately 45° relative to the extending direction of the second portion 13. The end 28a of the support piece 28 is bent by the sidewall panel 41 and the support piece 28 to contact the perforated plate portion 10.

[0153] like Figure 19 As shown, the second sidewall portion 50 has a sidewall plate 51 corresponding to the sidewall plate 41 of the second sidewall portion 40. Furthermore, the second sidewall portion 50, like the second sidewall portion 40, has a support plate 28. The support plate 28 of the second sidewall portion 50 constitutes the support portions 134a and 134b of the sound-absorbing structural member 104.

[0154] The widths h31 and h32 of the side wall panels 21, 31, 41, and 51 are, for example, the same or approximately the same. The widths h31 and h32 are values ​​that determine the width in the height direction of the space S1 of the sound-absorbing structure component 104. Therefore, by adjusting the values ​​of the widths h31 and h32, the resonant frequency of the spring-mass vibration system of the sound-absorbing structure 103 can be adjusted.

[0155] The sheet 2 has the structure described above, and each part is bent to form the sound-absorbing structural component 101. Furthermore, in the bending process of the sheet 2 used to form the sound-absorbing structural component 104, each bend is primarily a 90° or approximately 90° bend. However, the angle of each bend is not limited to 90°.

[0156] Regarding the formation of the sound-absorbing structural component 104, specifically, in the first sidewall portion 20, the sidewall plate 21 is bent outwards according to the crease structure of the first end portion 11 (see reference). Figure 6 , Figure 9 , Figure 10 Furthermore, the support plates 28 are bent relative to the side wall plate 21 toward the sound source side (see reference). Figure 6 , Figure 9 , Figure 10 ), forming a wall piece 121 of the sidewall portion 130. For example... Figure 6 , Figure 10As shown, the end 28a of the bent support piece 28 contacts and supports the surface 112 of the perforated plate 110. This prevents the sidewall panel 21 from tilting inwards. Similarly, in the first sidewall portion 30, the sidewall panel 31 and the support piece 28 are bent to form the wall piece 122 of the sidewall portion 130. Similarly, in the second sidewall portion 40, the sidewall panel 41 and the support piece 28 are bent to form the wall piece 123 of the sidewall portion 130. Similarly, in the second sidewall portion 50, the sidewall panel 51 and the support piece 28 are bent to form the wall piece 124 of the sidewall portion 130. Thus, the sound-absorbing structural member 104 is formed from the piece 2.

[0157] Next, a modified example of the sound-absorbing structural sheet 2, namely the sound-absorbing structural sheet 3, will be described. Furthermore, in the description of the sound-absorbing structural sheet 3, structures that are identical to or have the same function as the sheet 2 described above will be referred to by the same reference numerals, and their descriptions will be omitted.

[0158] The sound-absorbing structure plate 3 (hereinafter also referred to as plate 3) is the part that forms the sound-absorbing structure 109 (see reference). Figure 12 The bendable sheet, the sound-absorbing structure 109 is a variation of the sound-absorbing structure component 104 of the sound-absorbing structure 103 according to the second embodiment of the present invention described above. Figure 20 This is a top view of piece 3. Piece 3 differs in that it does not have the support piece 28 of piece 2, but has a different support piece.

[0159] like Figure 20 As shown, in plate 3, the sidewall plate 21 of the first sidewall portion 20 has inwardly protruding support plates 29a and 29b at the ends of end 21b and end 21c, respectively. The support plates 29a and 29b protrude beyond the first end 11. The support plates 29a and 29b are connected to both ends of the first end 11. Recesses 15a and 15b, corresponding to the support plates 29a and 29b, are formed in the perforated plate portion 10. The support plates 29a and 29b extend beyond the first end 11 along ends 21b and 21c, respectively. The support plates 29a and 29b form the support portions 135a and 135b of the sound-absorbing structural member 109.

[0160] like Figure 20 As shown, in plate 3, the sidewall plate 31 of the first sidewall portion 30, like the sidewall plate 21 of the first sidewall portion 20, has support plates 29a and 29b. The support plates 29a extend beyond the first end 12 along the ends 31b and 31c of the sidewall plate 31, respectively. Additionally, recesses 15a and 15b are formed in the perforated plate portion 10, corresponding to the support plates 29a and 29b of the sidewall plate 31, and are recessed inwards. The support plates 29a and 29b form the support portions 136a and 136b of the sound-absorbing structural member 109.

[0161] In addition, such as Figure 20 As shown in section 3, the sidewall plate 41 of the second sidewall portion 40 has support plates 38a and 38b that are respectively connected to end 41b and end 41c. Support plates 38a and 38b extend outward from end 41b and end 41c, respectively. End 38aa of support plate 38a is continuously connected to end 41a of sidewall plate 41. Furthermore, end 38aa is the outermost end of support plate 38a in a direction orthogonal to the extending direction (y-axis direction) of sidewall plate 41 (x-axis direction). Support plate 38a extends inward beyond the second end portion 13, and end 38ab of support plate 38a is located in a direction orthogonal to the extending direction (y-axis direction) of sidewall plate 41 (x-axis direction) further inward than the second end portion 13. Furthermore, end 38ab is the inner end of the support piece 38a in a direction orthogonal to the extending direction (y-axis direction) of the side wall plate 41. Support piece 38b has the same shape as support piece 38a, having ends 38ba and 38bb. Support pieces 38a and 38b are respectively capable of bending relative to the side wall plate 41 towards the sound source side. The support pieces 38a and 38b of the side wall plate 41 form the support portions 137a and 138b of the sound-absorbing structural member 109.

[0162] like Figure 20 As shown, in section 3, the sidewall plate 51 of the second sidewall portion 50, like the sidewall plate 41 of the second sidewall portion 40, has support plates 38a and 38b. The support plates 38a and 38b extend outward from ends 51b and 51c, respectively. Furthermore, the support plates 38a and 38b are each capable of bending relative to the sidewall plate 51 towards the sound source side. The support plates 38a and 38b of the sidewall plate 51 form the support portions 138a and 138b of the sound-absorbing structural member 109.

[0163] The protruding widths h41 and h42 of the support plates 29a and 29b protruding from the first ends 11 and 12 are the same or approximately the same. Similarly, the protruding widths h43 and h44 of the support plates 38a and 38b protruding from the second ends 13 and 14 are the same or approximately the same. Furthermore, the widths h41 and h42 of the support plates 29a and 29b are the same or approximately the same as the widths h43 and h44 of the support plates 38a and 38b. The widths h41, h42, h43, and h44 determine the width in the height direction of the space S2 of the sound-absorbing structure member 104. Therefore, by adjusting the values ​​of the widths h41, h42, h43, and h44, the resonant frequency of the Helmholtz resonator of the sound-absorbing structure 103 can be adjusted.

[0164] In addition, such as Figure 20As shown, in piece 3, the second end 13 is shorter than the side wall plate 41, and ends 16a and 16b are formed in the perforated plate portion 10, which are connected to the adjacent recesses 15a and 15b respectively from both ends of the second end 13. Ends 16a and 16b extend, for example, along the extending direction (x-axis direction) of the side wall plates 21 and 31, and are located inwardly than the first ends 11 and 12 in the extending direction (y-axis direction) of the side wall plate 41. Furthermore, in the extending direction (y-axis direction) of the side wall plate 41, gaps are formed between each end 16a and 16b and the support pieces 38a and 38b. Similarly, the second end 14 is shorter than the side wall plate 51, and ends 16a and 16b are formed in the perforated plate portion 10, which are connected to the adjacent recesses 15a and 15b respectively from both ends of the second end 14.

[0165] The sheet 3 has the structure described above, with each part bent to form a sound-absorbing structural component 109. Figure 21 This diagram shows a portion of the bending process of the sheet 3 used to form the sound-absorbing structural member 109. Furthermore, in the bending process of the sheet 3 used to form the sound-absorbing structural member 109, each bend is primarily a 90° or approximately 90° bend. However, the angle of each bend is not limited to 90°.

[0166] Regarding the formation of the sound-absorbing structural component 109, specifically, in the first sidewall portion 20, the sidewall plate 21 is bent inward according to the crease structure of the first end portion 11 (see reference). Figure 21 Furthermore, in the second sidewall portion 30, the sidewall plate 31 is bent inwards according to the crease structure of the first end portion 12 (see reference). Figure 21 Thus, the wall plates 121 and 122 forming the sidewall portion 130, and the support portions 135a, 135b, 136a, and 136b protrude further toward the fixed side than the perforated plate portion 10.

[0167] Next, in the second sidewall portion 40, the support pieces 38a and 38b are bent inward relative to the sidewall plate 41 (see reference). Figure 21 The second end 13 is bent inwards according to the crease structure. Additionally, in the second sidewall portion 50, the support pieces 38a and 38b are bent inwards relative to the sidewall plate 51 (see...). Figure 21 The second end 14 is bent inwards along the crease structure. This forms the wall pieces 123 and 124 of the perforated plate 110 and the side wall portion 130. Furthermore, the support portions 137a, 137b, 138a, and 138b protrude further towards the fixed side than the perforated plate 110 and contact the perforated plate 110, as well as the support portions 135a, 135b, 136a, and 136b. This prevents the wall pieces 121 and 122 from tilting inwards.

[0168] Next, the membrane component sheet 4 used to form the membrane component 105 of the sound-absorbing structure 103 will be described. Figure 22 This is a top view of membrane component sheet 4. (Example) Figure 22 As shown, the membrane component sheet 4 is a sheet having a shape for unfolding the membrane component 105, and is a sheet formed from a material such as paper, soft resin film, or rubber that forms the membrane component 105. Figure 22 As shown, the edge pieces 108a, 108b, 108c, and 108d of the membrane component sheet 4 forming edge portion 108 are coplanarly connected to the membrane portion 107. In the membrane component sheet 4, the ends 107c, 107d, 107e, and 107f of the membrane component 107 may have a crease structure. Furthermore, when the edge portions 108 of the membrane component 105 are connected in a ring shape, a connection allowance for connection may be provided at any end of the edge pieces 108a, 108b, 108c, and 108d. In this case, for example, the edge pieces 108a, 108b, 108c, and 108d can be connected by an adhesive or the like. In the membrane component sheet 4, the membrane component 105 is formed by bending the edge pieces 108a, 108b, 108c, and 108d relative to the membrane portion 107.

[0169] Next, the frame member sheet 5 used to form the frame member 106 of the sound-absorbing structure 103 will be described. Figure 23 This is a top view of the frame component sheet 5. (Example) Figure 23 As shown, the frame member sheet 5 is a sheet having the unfolded shape of the frame member 106, for example, a sheet formed from the same sheet as the sound-absorbing structure sheets 1 to 3. Figure 23 As shown, frame member sheets 106a, 106b, 106c, and 106d of frame member sheet 4 are connected coplanarly. In frame member sheet 5, the boundaries of frame member sheets 106a, 106b, 106c, and 106d may also have crease structures. Additionally, a connecting allowance portion for connecting into a ring shape may be provided in frame member sheet 5. In this case, for example, edge sheets 108a, 108b, 108c, and 108d can be connected by an adhesive. In frame member sheet 5, each part is bent to form frame member sheets 106a, 106b, 106c, and 106d, and frame member sheets 106a, 106b, 106c, and 106d are connected into a ring shape, thereby forming frame member 106. Alternatively, frame member sheet 5 may be a modified example having frame member 106 (see [reference]). Figure 11 A sheet material unfolded into its shape. In this case, a modified example of frame member 106 formed from frame member sheet material 5 (see reference). Figure 11 ).

[0170] As described above, the sound-absorbing structural components 104 and 109 can be formed by bending the sheet-like sound-absorbing structural pieces 2 and 3. Therefore, the sound-absorbing structural components 104 and 109 can be stored in the form of sheet-like sound-absorbing structural pieces 2 and 3. Therefore, the sound-absorbing structural components 104 and 109 can reduce the space required for storage.

[0171] As described above, the sound-absorbing structural components 104 and 109 according to the second embodiment of the present invention, as well as the sound-absorbing structural sheets 2 and 3 according to the second embodiment of the present invention, can suppress large volume during storage.

[0172] Furthermore, by combining sheets 2 and 3 with the aforementioned membrane component sheet 4 and frame component sheet 5, a sound-absorbing structure sheet assembly can be manufactured. This sound-absorbing structure sheet assembly also helps to reduce its large volume during storage.

[0173] The present invention has been described above through the above embodiments, but the technical scope of the present invention is not limited to the scope described in the above embodiments. It will be apparent to those skilled in the art that various modifications or improvements can be made to the above embodiments. As can be seen from the claims, such modifications or improvements can also be included within the technical scope of the present invention.

[0174] The embodiments described above are for ease of understanding of the present invention and are not intended to limit or explain the present invention. Furthermore, the above embodiments do not limit the scope of application of the present invention; the present invention can include all objects as its objects. The constituent elements, their arrangement, materials, conditions, shapes, and dimensions, etc., provided in the above embodiments are not limited to the examples shown and can be appropriately modified. For example, the present invention includes differences arising from manufacturing tolerances, etc. Furthermore, within the scope of technical non-contradiction, the constituent elements shown in different embodiments can be partially substituted or combined with each other. Additionally, the structures can be appropriately and selectively combined to achieve at least a portion of the aforementioned problems and effects.

[0175] For example, a bendable structure also includes a structure that is easily bendable. For example, as in the embodiments described above, a structure that is easily bendable through a crease construction is also included in a bendable structure. In addition, a structure that can be bent in a specific direction may also include a structure that can be bent in other directions, such as the opposite direction of the specific direction.

[0176] 1, 2, 3 Sound-absorbing structural sheet, 1a Surface, 1b Back side, 4 Membrane component sheet, 5 Frame component sheet, 10 Perforated plate section, 11, 12 First end, 13, 14 Second end, 15a, 15b Support sheet, 16a, 16b End, 20, 30 First side wall section, 21, 31 Side wall panel, 21a, 21b, 21c, 31a, 31b, 31c End, 22, 32 First inner wall panel, 22a, 32a Slit, 23, 33 Outer wall panel, 24, 34 Second inner wall panel, 24a, 24b, 34a, 34b End, 24c, 24d, 34c, 34d Recess, 24e, 24f, 34e, 34f Protrusion, 25, 26, 35, 36 End panel, 27a, 27b, 27c 27d, 37a, 37b, 37c, 37d crease construction, 28, 38a, 38b support piece, 28a end, 29a, 29b protrusion, 38aa, 38ab, 38ba, 38bb end, 40, 50 second side wall portion, 41, 51 side wall plate, 41a, 41b, 41c, 51a, 51b, 51c, 42, 52 end, first inner wall plate, 43, 53 outer wall plate, 43a, 43b, 53a, 53b end, 44, 54 second inner wall plate, 44a, 44b, 54a, 54b end, 44c, 44d, 54c, 54d slit, 45, 46, 55, 56 end panel, 47a, 47b, 47c, 47d, 57a, 57b, 57c, 57d Crease structure, 48 fixing part, 48a first fixing part, 48aa main body part, 48ab, 48ac claw part, 48b second fixing part, 48ba recess, 100, 103 sound-absorbing structure, 101, 104, 109 sound-absorbing structure component, 102, 105 membrane component, 102a, 102b surface, 106 frame component, 106a, 106b, 106c, 106d frame component piece, 106e, 106f, 106aa, 106ba, 106ca, 106da end, 106g, 106h, 106i, 106j fixing piece, 107 membrane part, 107a, 107b surface, 107c, 107d, 107e, 107f end, 108 edge part, 108a, 10 8b, 108c, 108d edge pieces, 108aa, 108ab, 108ac, 108ba, 108bb, 108bc, 108ca, 108cb, 108cc, 108da, 108db, 108dc ends, 110 perforated plate, 110a, 110b, 110c, 110d ends, 111 through hole, 112, 113 face, 120, 130 sidewall, 120a, 120b ends, 121, 122, 123, 124 wall pieces, 121a, 121b, 121c, 121d, 122a, 122b, 122c, 122d, 123a, 123b, 123c, 123d, 124a, 124b, 124c.124d end, 125a, 125b, 126a, 126b fixing parts, 131a, 131b, 132a, 132b, 133a, 133b, 134a, 134b, 135a, 135b, 136a, 136b, 137a, 137b, 138a, 138b support parts, 131aa, 131ba, 132aa, 132ba, 133aa, 133ba, 134aa, 134ba ends, h11, h12, h13, h21, h22, h23, h31, h32, h33, h34 width, S, S1, S2 space.

Claims

1. A sound-absorbing structural sheet, which can be assembled onto a sound-absorbing structure. The sound-absorbing structural sheet is formed from a bendable sheet and includes: The perforated plate section forms a perforated plate with multiple through holes; A pair of first sidewall portions, forming a pair of first sidewalls facing each other; And a pair of second sidewall portions, forming a pair of opposing second sidewalls, The perforated plate portion has a first end and a second end, the first end being a pair of ends opposite to each other, and the second end being a pair of ends extending in a direction intersecting the first end and opposite to each other. The pair of first sidewall portions are respectively connected to the pair of first ends of the perforated plate portion in a bendable manner. The pair of second sidewall portions are respectively connected to the pair of second ends of the perforated plate portion in a bendable manner. The pair of first sidewall portions are each bendable so that the perforated plate is positioned between a pair of ends of the first sidewall portions in the direction facing the perforated plate. The pair of second sidewall portions are each bendable so that the perforated plate is located between a pair of ends of the second sidewall portion in the direction in which the perforated plate faces.

2. The sound-absorbing structural sheet according to claim 1, wherein, The first sidewall portion has a plurality of sidewall plates extending along the first end. The second sidewall portion has a plurality of sidewall plates extending along the second end. In the first sidewall portion, the plurality of sidewall panels are connected in a bendable manner in the extending direction of the first sidewall portion extending from the first end. In the second sidewall portion, the plurality of sidewall panels are connected in an extending direction extending from the second end of the second sidewall portion in a bendable manner.

3. The sound-absorbing structural sheet according to claim 2, wherein, The plurality of sidewall panels of the first sidewall portion include: a first inner wall panel capable of bending in one direction toward the direction facing the perforated plate portion; and an outer wall panel capable of bending relative to the first inner wall panel in another direction toward the direction facing the perforated plate portion. The plurality of sidewall panels of the second sidewall portion include: a first inner wall panel capable of bending in one direction toward the direction facing the perforated plate portion; and an outer wall panel capable of bending relative to the first inner wall panel in another direction toward the direction facing the perforated plate portion. In the first sidewall portion, the width of the outer wall panel in the extending direction is greater than the width of the first inner wall panel in the extending direction. In the second sidewall portion, the width of the outer wall plate in the extending direction is greater than the width of the first inner wall plate in the extending direction.

4. The sound-absorbing structural sheet according to claim 3, wherein, The plurality of sidewall panels of the first sidewall portion include a second inner wall panel, which is capable of bending relative to the outer wall panel in a direction opposite to the direction facing the perforated plate portion. The plurality of sidewall panels of the second sidewall portion include a second inner wall panel, which is capable of bending relative to the outer wall panel in a direction opposite to the direction in which the perforated plate portion faces.

5. The sound-absorbing structural sheet according to claim 1, wherein, The second sidewall portion has a fixing portion for fixing the second sidewall portion to the first sidewall portion. The fixing part fixes the second sidewall part to the first sidewall part, such that a pair of ends of the second sidewall part along the extension direction of the second end are respectively opposite to the adjacent one of a pair of ends of the first sidewall part along the extension direction of the first end.

6. The sound-absorbing structural sheet according to claim 1, wherein, The bendable sheet is made of corrugated cardboard.

7. A sound-absorbing structural panel assembly, capable of being assembled onto a sound-absorbing structure, comprising: The sound-absorbing structural sheet is formed from a bendable sheet; as well as Membrane components, forming a flexible membrane, The sound-absorbing structural sheet has: The perforated plate section forms a perforated plate with multiple through holes; A pair of first sidewall portions, forming a pair of first sidewalls facing each other; and A pair of second sidewalls, forming a pair of opposing second sidewalls. The perforated plate portion has a first end and a second end, the first end being a pair of opposite ends, and the second end being a pair of opposite ends extending in a direction intersecting the first end. The pair of first sidewall portions are respectively connected to the pair of first ends of the perforated plate portion in a bendable manner. The pair of second sidewall portions are respectively connected to the pair of second ends of the perforated plate portion in a bendable manner. The pair of first sidewall portions are each capable of bending in a manner that protrudes from the perforated plate in the direction facing the perforated plate. The pair of second sidewall portions are each capable of bending in a manner that protrudes from the perforated plate in the direction facing the perforated plate. The membrane component faces the perforated plate in one direction of the direction the perforated plate faces, and forms the space between itself and the perforated plate.

8. The sound-absorbing structural sheet assembly according to claim 7 further comprises: The frame component is made of the aforementioned bendable sheet. The frame component is bent and glued to form an annular frame component that can fix the membrane component to the first sidewall and the second sidewall.

9. The sound-absorbing structural sheet assembly according to claim 8, wherein, The membrane component surrounds the first sidewall and the second sidewall from the outer peripheral side. The frame member surrounds the first sidewall and the second sidewall from the outer periphery via the membrane member that surrounds the first sidewall and the second sidewall from the outer periphery.

10. The sound-absorbing structural sheet assembly according to claim 8, wherein, The frame component protrudes from the first sidewall and the second sidewall in the direction facing the perforated plate. The protruding part can bend outwards.

11. The sheet assembly for the sound-absorbing structure according to claim 7, wherein, The pair of first sidewall portions are each bendable so that the perforated plate is positioned between a pair of ends of the first sidewall portions in the direction facing the perforated plate. The pair of second sidewall portions are each bendable so that the perforated plate is located between a pair of ends of the second sidewall portion in the direction in which the perforated plate faces.

12. The sound-absorbing structural sheet assembly according to claim 11, wherein, The first sidewall portion has a plurality of sidewall plates extending along the first end. The second sidewall portion has a plurality of sidewall plates extending along the second end. In the first sidewall portion, the plurality of sidewall panels are connected in a bendable manner in the extending direction of the first sidewall portion extending from the first end. In the second sidewall portion, the plurality of sidewall panels are connected in an extending direction extending from the second end of the second sidewall portion in a bendable manner.

13. The sound-absorbing structural sheet assembly according to claim 12, wherein, The plurality of sidewall panels of the first sidewall portion include: a first inner wall panel capable of bending in a direction opposite to the direction facing the perforated plate portion; and an outer wall panel capable of bending relative to the first inner wall panel in a direction facing the perforated plate portion. The plurality of sidewall panels of the second sidewall portion include: a first inner wall panel capable of bending in a direction other than the direction facing the perforated plate portion; and an outer wall panel capable of bending relative to the first inner wall panel in a direction facing the perforated plate portion. In the first sidewall portion, the width of the outer wall panel in the extending direction is greater than the width of the first inner wall panel in the extending direction. In the second sidewall portion, the width of the outer wall plate in the extending direction is greater than the width of the first inner wall plate in the extending direction.

14. The sound-absorbing structural sheet assembly according to claim 13, wherein, The plurality of sidewall panels of the first sidewall portion include a second inner wall panel, which is capable of bending relative to the outer wall panel in a direction facing the perforated plate portion. The plurality of sidewall panels of the second sidewall portion include a second inner wall panel, which is capable of bending relative to the outer wall panel in a direction facing the perforated plate portion.

15. The sound-absorbing structural sheet assembly according to claim 7, wherein, The second sidewall portion has a fixing portion for fixing the second sidewall portion to the first sidewall portion. The fixing part fixes the second sidewall part to the first sidewall part, such that a pair of ends of the second sidewall along the extension direction of the second end are respectively opposite to the adjacent one of a pair of ends of the first sidewall along the extension direction of the first end.

16. The sound-absorbing structural sheet assembly according to claim 7, further comprising: The first support portion supports the first sidewall on the perforated plate; as well as The second support portion supports the second sidewall on the perforated plate. The first support portion extends from the first sidewall portion in a bendable manner. The second support extends from the second sidewall portion in a bendable manner.

17. The sound-absorbing structural sheet assembly according to claim 16, wherein, The first support portion is connected to a pair of ends of the first sidewall portion along the extension direction of the first end portion. The first support portion is bent relative to the first sidewall portion in the first sidewall portion that is bent relative to the perforated plate portion, and contacts the perforated plate portion at one end in the direction facing the perforated plate portion. The second support portion is connected to a pair of ends of the second sidewall portion along the extension direction of the second end portion. The second support portion is bent relative to the second sidewall portion in the second sidewall portion that is bent relative to the perforated plate portion, and contacts the perforated plate portion at one end in the direction facing the perforated plate portion.

18. The sound-absorbing structural sheet assembly according to claim 7, wherein, The bendable sheet is made of corrugated cardboard.

19. A sound-absorbing structure, comprising: The sound-absorbing structural component is formed from a bendable sheet; as well as Membrane components, forming a flexible membrane, The sound-absorbing structural component includes: a perforated plate with multiple through holes; and an annular sidewall surrounding the perforated plate from its outer periphery. The perforated plate is formed by bending the sheet. The sidewall is formed by bending the sheet. The sidewall protrudes from the perforated plate in one direction toward the direction the perforated plate faces. The membrane faces the perforated plate in one of the directions in which the perforated plate faces, and forms a space between the membrane and the perforated plate.

20. The sound-absorbing structure according to claim 19, further comprising: The frame component is a ring-shaped component formed from bendable sheets. The frame component secures the membrane component to the sidewall.

21. The sound-absorbing structure according to claim 20, wherein, The outer peripheral end of the membrane component surrounds the sidewall from the outer peripheral side. The frame member surrounds the sidewall from the outer periphery via the membrane member that surrounds the sidewall from the outer periphery.

22. The sound-absorbing structure according to claim 19, wherein, The frame component protrudes from the sidewall in the direction facing the perforated plate. The protruding portion of the frame component can be bent outwards.

23. The sound-absorbing structure according to claim 19, wherein, The perforated plate is located between a pair of ends of the sidewall in the direction in which the perforated plate faces.

24. The sound-absorbing structure according to claim 19, wherein, The bendable sheet is made of corrugated cardboard.

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