Sound absorption structural sheet, sound absorption structural sheet set, and sound absorption structure

Abstract

To suppress bulkiness during storage.SOLUTION: A sound absorption structure 100 comprises: a sound absorption structural member 101 formed from a foldable sheet 1; and a membrane member 102 forming a flexible membrane. The sound absorption structural member 101 includes a perforated panel 110 having multiple through holes 111 and an annular side wall portion 120 surrounding the perforated panel 110 from the outer periphery. The perforated panel 110 is formed by bending the sheet 1. The side wall portion 120 is formed by bending the sheet 1. The perforated panel 110 is positioned between a pair of ends 120a, 120b of the side wall portion 120 in the direction facing the perforated panel 110. The membrane member 102 faces the perforated panel 110 in the direction facing the perforated panel 110, forming a space S1 between itself and the perforated panel 110.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a sound-absorbing structure sheet, a sound-absorbing structure sheet set, and a sound-absorbing structure. [Background technology]

[0002] Conventionally, various soundproof structures have been proposed for soundproofing, including a sound-absorbing structure that has a sound-absorbing function (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-096826 Summary of the Invention [Problem to be solved by the invention]

[0004] Conventional sound-absorbing structures are composed of multiple components. As a result, conventional sound-absorbing structures are bulky when stored and require a certain amount of space. For this reason, when conventional sound-absorbing structures are stored for emergency use, for example, to be used as partitions in evacuation shelters such as schools in the event of a disaster, there may be concerns about storage space in the storage location. For this reason, it is not possible to store a sufficient number of conventional sound-absorbing structures for emergency use in the event of a disaster, or there are cases where storing sound-absorbing structures for emergency use in the event of a disaster is abandoned.

[0005] For this reason, there has been a demand for a configuration that can reduce the storage space required for conventional sound absorbing structures.

[0006] The present invention has been made in consideration of the above-mentioned problems, and its purpose is to provide a sound-absorbing structure sheet, a sound-absorbing structure sheet set, and a sound-absorbing structure that can reduce bulkiness during storage. [Means for solving the problem]

[0007] In order to achieve the above object, the sound absorbing structure sheet of the present invention is a sound absorbing structure sheet that can be assembled to a sound absorbing structure, and includes a punched panel portion formed of a foldable sheet and forming a punched panel having a plurality of through holes, a pair of first side wall portions forming a pair of opposing first side walls, and a pair of second side wall portions forming a pair of opposing second side walls, wherein the punched panel portion has first ends that are a pair of opposing ends and second ends that are a pair of opposing ends extending in a direction intersecting the first ends, and the pair of first side wall portions are foldably connected to the pair of first end portions of the punching panel portion, the pair of second side wall portions are foldably connected to the pair of second end portions of the punching panel portion, the pair of first side wall portions are foldable in the direction in which the punching panel faces so that the punching panel is positioned between the pair of ends of the first side wall portions, and the pair of second side wall portions are foldable in the direction in which the punching panel faces so that the punching panel is positioned between the pair of ends of the second side wall portions.

[0008] In a sound-absorbing structure sheet according to one embodiment of the present invention, the first side wall portion has a plurality of side wall panels extending along the first end portion, and the second side wall portion has a plurality of side wall panels extending along the second end portion, and in the first side wall portion, the plurality of side wall panels are foldably connected in the extension direction from the first end portion of the first side wall portion, and in the second side wall portion, the plurality of side wall panels are foldably connected in the extension direction from the second end portion of the second side wall portion.

[0009] In one embodiment of the sound-absorbing structure sheet of the present invention, the multiple side wall panels of the first side wall portion include a first inner wall panel that can be bent in one direction in which the punched panel portion faces and an outer wall panel that can be bent in the other direction in which the punched panel portion faces relative to the first inner wall panel, and the multiple side wall panels of the second side wall portion include a first inner wall panel that can be bent in one direction in which the punched panel portion faces and an outer wall panel that can be bent in the other direction in which the punched panel portion faces relative to the first inner wall panel, and in the first side wall portion, the width of the outer wall panel in the extension direction is wider than the width of the first inner wall panel in the extension direction, and in the second side wall portion, the width of the outer wall panel in the extension direction is wider than the width of the first inner wall panel in the extension direction.

[0010] In one embodiment of the sound-absorbing structure sheet of the present invention, the multiple side wall panels of the first side wall portion include a second inner wall panel that can be bent in the other direction of the facing direction of the punched panel portion relative to the outer wall panel, and the multiple side wall panels of the second side wall portion include a second inner wall panel that can be bent in the other direction of the facing direction of the punched panel portion relative to the outer wall panel.

[0011] In one embodiment of the sound-absorbing structure sheet of the present invention, the second side wall portion has a fixing portion that fixes the second side wall portion to the first side wall portion, and the fixing portion is configured to fix the second side wall portion to the first side wall portion so that a pair of ends of the second side wall portion in the extension direction along the second end portion each face an adjacent one of a pair of ends of the first side wall in the extension direction along the first end portion.

[0012] In the sound-absorbing structure sheet according to one aspect of the present invention, the foldable sheet is a cardboard sheet.

[0013] In order to achieve the above object, the sound absorbing structure sheet set of the present invention is a sound absorbing structure sheet set that can be assembled to a sound absorbing structure, and includes a sound absorbing structure sheet formed of a foldable sheet, and a membrane member that forms a flexible membrane, wherein the sound absorbing structure sheet has a punched panel portion that forms a punched panel having a plurality of through holes, a pair of first side wall portions that form a pair of first side walls that face each other, and a pair of second side wall portions that form a pair of second side walls that face each other, and the punched panel portion has first end portions that are a pair of ends that face each other and second end portions that are a pair of ends that face each other and extend in a direction intersecting the first end portions, and the pair of first side wall portions are , each of the pair of first end portions of the punching panel portion can be folded, the pair of second side wall portions can be folded so as to protrude from the punching panel in one of the directions in which the punching panel faces, and the pair of second side wall portions can be folded so as to protrude from the punching panel in one of the directions in which the punching panel faces, and the membrane member faces the punching panel in one of the directions in which the punching panel faces, forming the space between the membrane member and the punching panel.

[0014] The sound-absorbing structure sheet set according to one embodiment of the present invention further includes a frame member sheet formed from the foldable sheet, and the frame member sheet is folded and adhered to form an annular frame member that enables the membrane member to be fixed to the first side wall and the second side wall.

[0015] In a sound-absorbing structure sheet set according to one embodiment of the present invention, the membrane member surrounds the first side wall and the second side wall from the outer periphery, and the frame member surrounds the first side wall and the second side wall from the outer periphery via the membrane member that surrounds the first side wall and the second side wall from the outer periphery.

[0016] In one embodiment of the sound-absorbing structure sheet set of the present invention, the frame member protrudes from the first side wall and the second side wall in the direction facing the punching panel, and the protruding portion can be bent outward.

[0017] In a sound-absorbing structure sheet set according to one embodiment of the present invention, each of the pair of first side wall portions is foldable in the direction in which the punching panel faces so that the punching panel is positioned between a pair of ends of the first side wall portions, and each of the pair of second side wall portions is foldable in the direction in which the punching panel faces so that the punching panel is positioned between a pair of ends of the second side wall portions.

[0018] In a sound-absorbing structure sheet set according to one embodiment of the present invention, the first side wall portion has a plurality of side wall panels extending along the first end portion, and the second side wall portion has a plurality of side wall panels extending along the second end portion, and in the first side wall portion, the plurality of side wall panels are foldably connected in the extension direction from the first end portion of the first side wall portion, and in the second side wall portion, the plurality of side wall panels are foldably connected in the extension direction from the second end portion of the second side wall portion.

[0019] In a sound-absorbing structure sheet set according to one embodiment of the present invention, the side wall panels of the first side wall portion include a first inner wall panel that can be folded in the other direction in which the punched panel portion faces, and an outer wall panel that can be folded in one direction in which the punched panel portion faces relative to the first inner wall panel, and the side wall panels of the second side wall portion include a first inner wall panel that can be folded in the other direction in which the punched panel portion faces, and an outer wall panel that can be folded in one direction in which the punched panel portion faces relative to the first inner wall panel, and in the first side wall portion, the width of the outer wall panel in the extension direction is wider than the width of the first inner wall panel in the extension direction, and in the second side wall portion, the width of the outer wall panel in the extension direction is wider than the width of the first inner wall panel in the extension direction.

[0020] In one embodiment of the sound-absorbing structure sheet set of the present invention, the multiple side wall panels of the first side wall portion include a second inner wall panel that can be bent in one direction toward the punched panel portion relative to the outer wall panel, and the multiple side wall panels of the second side wall portion include a second inner wall panel that can be bent in one direction toward the punched panel portion relative to the outer wall panel.

[0021] In one embodiment of the sound-absorbing structure sheet set of the present invention, the second side wall portion has a fixing portion that fixes the second side wall portion to the first side wall portion, and the fixing portion is configured to fix the second side wall portion to the first side wall portion so that a pair of ends in the extension direction along the second end of the second side wall each face an adjacent one of a pair of ends in the extension direction along the first end of the first side wall.

[0022] A sound-absorbing structure sheet set according to one embodiment of the present invention further includes a first support portion that supports the first side wall against the punched panel and a second support portion that supports the second side wall against the punched panel, wherein the first support portion extends foldably from the first side wall portion and the second support portion extends foldably from the second side wall portion.

[0023] In one embodiment of the sound-absorbing structure sheet set of the present invention, the first support portion is connected to each of a pair of ends in the extension direction along the first end portion of the first side wall portion, and the first support portion is folded against the first side wall portion at the first side wall portion bent against the punching panel portion so as to contact the punching panel portion at one of the ends in the direction facing the punching panel portion, and the second support portion is connected to each of a pair of ends in the extension direction along the second end portion of the second side wall portion, and the second support portion is folded against the second side wall portion at the second side wall portion bent against the punching panel portion so as to contact the punching panel portion at one of the ends in the direction facing the punching panel portion.

[0024] In the sound-absorbing structure sheet set according to one aspect of the present invention, the foldable sheet is a cardboard sheet.

[0025] In order to achieve the above-mentioned object, the sound-absorbing structure of the present invention comprises a sound-absorbing structural member formed of a foldable sheet and a membrane member forming a flexible membrane, the sound-absorbing structural member having a punched panel having a plurality of through holes and an annular side wall surrounding the punched panel from the outer periphery, the punched panel being formed by folding the sheet, the side wall being formed by folding the sheet, the side wall protruding from the punched panel in one of the directions in which the punched panel faces, and the membrane portion facing the punched panel in one of the directions in which the punched panel faces forms a space between the punched panel and the membrane portion.

[0026] The sound absorbing structure according to one aspect of the present invention further includes a frame member that is an annular member formed from a bendable sheet, and the frame member fixes the membrane member to the side wall.

[0027] In one aspect of the sound-absorbing structure of the present invention, the outer peripheral end of the membrane member surrounds the side wall from the outer peripheral side, and the frame member surrounds the side wall from the outer peripheral side via the membrane member that surrounds the side wall from the outer peripheral side.

[0028] In a sound-absorbing structure according to one aspect of the present invention, the frame member protrudes from the side wall in the direction facing the punching panel, and the protruding portion of the frame member is bendable toward the outer periphery.

[0029] In the sound absorbing structure according to one aspect of the present invention, the punched panel is located between a pair of ends of the side walls in the direction in which the punched panel faces.

[0030] In the sound absorbing structure according to one aspect of the present invention, the foldable sheet is a cardboard sheet. [Effects of the Invention]

[0031] The sound absorbing structure sheet, sound absorbing structure sheet set, and sound absorbing structure according to the present invention can reduce bulkiness during storage. [Brief explanation of the drawings]

[0032] [Figure 1] 1 is a perspective view showing a schematic configuration of a sound absorbing structure according to a first embodiment of the present invention. [Figure 2] 1 is a perspective view showing, with a portion thereof being see-through, the schematic configuration of a sound absorbing structure according to a first embodiment of the present invention. [Figure 3] 1 is a perspective view showing a schematic configuration of a sound absorbing structure according to a first embodiment of the present invention. [Figure 4] FIG. 2 is a cross-sectional view taken along line AA in FIG. [Figure 5] FIG. 10 is a perspective view showing a schematic configuration of a sound absorbing structure according to a second embodiment of the present invention. [Figure 6] FIG. 10 is an exploded perspective view showing a schematic configuration of a sound absorbing structure according to a second embodiment of the present invention. [Figure 7]FIG. 6 is a cross-sectional view showing a cross section taken along line BB in FIG. 5. [Figure 8] FIG. 10 is a perspective view showing a schematic configuration of a membrane member in a sound absorbing structure according to a second embodiment of the present invention. [Figure 9] FIG. 10 is a perspective view showing a schematic configuration of a sound absorbing structural member in a sound absorbing structure according to a second embodiment of the present invention. [Figure 10] FIG. 2 is a plan view showing a schematic configuration of a sound-absorbing structural member. [Figure 11] FIG. 10 is a perspective view of a sound absorbing structure according to a second embodiment of the present invention, which has a modified frame member. [Figure 12] FIG. 10 is a perspective view showing a modified example of the sound absorbing structural member of the sound absorbing structure according to the second embodiment of the present invention. [Figure 13] 1 is a plan view of a sound absorbing structure sheet according to a first embodiment of the present invention. [Figure 14] 14A to 14C are diagrams showing a part of the process of folding the sound absorbing structural sheet shown in FIG. 13 to form a sound absorbing structural member. [Figure 15] 14A to 14C are diagrams showing a part of the process of folding the sound absorbing structural sheet shown in FIG. 13 to form a sound absorbing structural member. [Figure 16] 14A to 14C are diagrams showing a part of the process of folding the sound absorbing structural sheet shown in FIG. 13 to form a sound absorbing structural member. [Figure 17] 14A to 14C are diagrams showing a part of the process of folding the sound absorbing structural sheet shown in FIG. 13 to form a sound absorbing structural member. [Figure 18] 14A to 14C are diagrams showing a part of the process of folding the sound absorbing structural sheet shown in FIG. 13 to form a sound absorbing structural member. [Figure 19] FIG. 10 is a plan view of a sound-absorbing structure sheet according to a second embodiment of the present invention. [Figure 20] FIG. 10 is a plan view of a modified example of the sound-absorbing structure sheet according to the second embodiment of the present invention. [Figure 21] 10A and 10B are views showing a part of a folding process of a modified example of the sound absorbing structure sheet according to the second embodiment of the present invention to form a sound absorbing structure member. [Figure 22] FIG. 2 is a plan view of a membrane sheet. [Figure 23] FIG. DETAILED DESCRIPTION OF THE INVENTION

[0033] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that in the drawings, not all of the components are labeled with reference numerals, and some of the components may be omitted.

[0034] FIG. 1 is a perspective view showing the schematic configuration of a sound-absorbing structure 100 according to a first embodiment of the present invention. FIG. 2 is a perspective view showing the schematic configuration of the sound-absorbing structure 100 according to the first embodiment of the present invention, with a portion thereof seen through. FIG. 3 is a perspective view showing the schematic configuration of the sound-absorbing structure 100. FIG. 4 is a cross-sectional view taken along line AA in FIG. 1. Note that FIG. 3 shows the sound-absorbing structure 100 as seen from the opposite side to that shown in FIGS. 1 and 2. As shown in FIGS. 1 to 4, the sound-absorbing structure 100 according to the first embodiment of the present invention comprises a sound-absorbing structural member 101 formed of a foldable sheet 1 and a membrane member 102 forming a flexible membrane. The sound-absorbing structural member 101 comprises a perforated panel 110 having a plurality of through-holes 111 and an annular side wall 120 surrounding the perforated panel 110 from the outer periphery. The perforated panel 110 is formed by bending the sheet 1. The side wall 120 is formed by bending the sheet 1. The perforated panel 110 is located between a pair of ends 120a, 120b of the side wall portion 120 in the direction in which the perforated panel 110 faces. The membrane member 102 faces the perforated panel 110 in the direction in which the perforated panel 110 faces, forming a space S1 between itself and the perforated panel 110. The configuration of the sound-absorbing structure 100 will be described in detail below. Note that in Figure 1, the interior of the sound-absorbing structure 100 is shown through the membrane member 102.

[0035] 1 to 4, for convenience of explanation, one side of the punched panel 110 facing direction is referred to as the sound source side, and the other side of the punched panel 110 facing direction is referred to as the fixed side.

[0036] As shown in FIGS. 1 and 3, the membrane member 102 is, for example, a flexible, thin membrane-like member and has a pair of faces 102a and 102b facing back to back. The face 102a faces the sound source side, and the face 102b faces the fixed side. The membrane member 102 is configured to bend in the direction in which the faces 102a and 102b face, thereby causing the membrane member 102 to vibrate. As shown in FIGS. 1 and 3, the membrane member 102 is, for example, rectangular or approximately rectangular and has a pair of ends 102c and 102d facing back to back and a pair of ends 102e and 102f facing back to back. The ends 102e and 102f extend in a direction intersecting the direction in which the ends 102c and 102d extend, respectively. For example, the ends 102c and 102d each extend linearly or substantially linearly, and the ends 102e and 102f each extend perpendicular or substantially perpendicular to the direction in which the ends 102c and 102d extend.

[0037] The film member 102 is made of a material such as paper, soft resin film, or rubber. The paper material for the film member 102 includes various types of paper such as copy paper, newspaper, Japanese paper, and advertising paper. However, the material for the film member 102 is not limited to these. The surface density of the film member 102 is, for example, 0.03 kg / m 2 More than 0.3kg / m 2 The surface density of the membrane member 102 is not limited to the above-mentioned values. The membrane member 102 is attached to the side wall portion 120 so that the surface 102b faces the punching panel 110, as shown in FIGS.

[0038] As described above, the sound-absorbing structural member 101 includes a perforated panel 110 and a side wall 120. As shown in FIGS. 1 to 4, the side wall 120 is a frame-shaped member that forms the outer edge of the sound-absorbing structural member 101 and extends in an annular shape to surround the space S. The side wall 120 has a height in the direction in which the perforated panel 110 faces, extends in the direction in which the perforated panel 110 faces, and has an end 120a on the sound source side and an end 120b on the fixed side. As shown in FIGS. 1 to 3, for example, the side wall 120 extends in an annular shape in a rectangular or approximately rectangular shape to surround a rectangular or approximately rectangular space. Specifically, as shown in FIGS. 2 to 4, the side wall 120 includes wall pieces 121 and 122 that face each other across the space S, and wall pieces 123 and 124 that face each other across the space S. The wall pieces 123 and 124 extend in a direction intersecting the direction in which the wall pieces 121 and 122 extend. For example, the wall pieces 123 and 124 are perpendicular or substantially perpendicular to the direction in which the wall pieces 121 and 122 extend. The wall pieces 121, 122, 123 and 124 are each plate-shaped, and are rectangular or substantially rectangular plate-shaped portions, for example, as shown in FIGS. 2 to 4. The shape of the wall piece 121 and the shape of the wall piece 122 are the same or substantially the same. The shape of the wall piece 123 and the shape of the wall piece 124 are the same or substantially the same. The shapes of the wall pieces 121, 122, 123 and 124 may be the same or substantially the same.

[0039] 2, the wall piece 121 has a pair of ends 121a and 121b facing back to back, and a pair of ends 121c and 121d facing back to back. The ends 121a and 121b extend in the circumferential direction of the side wall 120, and the ends 121c and 121d extend in the height direction of the side wall 120. The end 121a is the end on the sound source side, and the end 121b is the end on the fixed side. The ends 121a and 121b form part of the ends 120a and 120b of the side wall 120, respectively. The ends 121a and 121b extend along a plane. The ends 121c and 121d each extend between the end 121a and the end 121b. For example, the ends 121c and 121d extend perpendicular or substantially perpendicular to the ends 121a and 121b, respectively. The wall piece 122 also has a pair of ends 122a and 122b facing back to back, and a pair of ends 122c and 122d facing back to back. The ends 122a and 122b extend in the circumferential direction of the side wall 120, and the ends 122c and 122d extend in the height direction of the side wall 120. The end 122a is the end on the sound source side, and the end 122b is the end on the fixed side. The ends 122a and 122b form part of the ends 120a and 120b of the side wall 120, respectively. The ends 122a and 122b each extend along a plane. Ends 122c and 122d extend between ends 122a and 122b, respectively, and for example, ends 122c and 122d extend perpendicular or substantially perpendicular to ends 122a and 122b, respectively.

[0040] The shape of the wall piece 123 and the shape of the wall piece 124 are the same or approximately the same. As shown in FIG. 2, the wall piece 123 has a pair of ends 123a and 123b facing back to back with each other and a pair of ends 123c and 123d facing back to back with each other. The ends 123a and 123b extend in the circumferential direction of the side wall portion 120, and the ends 123c and 123d extend in the height direction of the side wall portion 120. The end 123a is the end on the sound source side, and the end 123b is the end on the fixed side. The ends 123a and 123b form part of the ends 120a and 120b of the side wall portion 120, respectively. The ends 123a and 123b extend along a plane. The ends 123c and 123d each extend between the ends 123a and 123b. For example, the ends 123c and 123d extend perpendicular or substantially perpendicular to the ends 123a and 123b, respectively. The wall piece 124 also has a pair of ends 124a and 124b facing back to back, and a pair of ends 124c and 124d facing back to back. The ends 124a and 124b extend in the circumferential direction of the side wall 120, and the ends 124c and 124d extend in the height direction of the side wall 120. The end 124a is the end on the sound source side, and the end 124b is the end on the fixed side. The ends 124a and 124b form part of the ends 120a and 120b of the side wall 120, respectively. The ends 124a and 124b each extend along a plane. Ends 124c and 124d each extend between ends 124a and 124b, for example, ends 124c and 124d extend perpendicular or substantially perpendicular to ends 124a and 124b, respectively.

[0041] 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 end 123c of the wall piece 123 and the end 124d of the wall piece 124, respectively, and the ends 122c and 122d of the wall piece 122 are not integrally connected to the end 123d of the wall piece 123 and the end 124c of the wall piece 124, respectively.

[0042] 1 to 4, side wall portion 123 has fixing portions 125a and 125b at ends 123c and 123d, respectively, for fixing side wall portion 123 to side wall portions 121 and 122, and similarly, side wall portion 124 has fixing portions 126a and 126b at ends 124c and 124d, respectively, for fixing side wall portion 124 to side wall portions 121 and 122. Details of fixing portions 125a, 125b, 126a and 126b will be described later.

[0043] The perforated panel 110 is a part for forming a Helmholtz resonator in a sound-absorbing structural member. As shown in FIGS. 2 to 4, the perforated panel 110 has a plate-like shape and a pair of faces 112 and 113 facing back to back. The faces 112 and 113 are, for example, flat surfaces. The perforated panel 110 has a shape corresponding to the space S surrounded by the side wall portion 120. As shown in FIGS. 2 to 4, for example, the perforated panel 110 is a rectangular or approximately rectangular plate-like shape and has a pair of ends 110a and 110b facing back to back and a pair of ends 110c and 110d facing back to back. The ends 110a, 110b, 110c, and 110d correspond to the wall pieces 121, 122, 123, and 124, respectively, and the ends 110c and 110d extend in a direction intersecting the direction in which the ends 110a and 110b extend. For example, the ends 110a and 110b extend linearly or substantially linearly, and the ends 110c and 110d extend perpendicular or substantially perpendicular to the direction in which the ends 110a and 110b extend. The length of the end 110a is equal to or substantially equal to the width between the ends 121c and 121d of the wall piece 121. The length of the end 110b is equal to or substantially equal to the width between the ends 122c and 122d of the wall piece 122. The length of the end 110c is equal to or substantially equal to the width between the ends 123c and 123d of the wall piece 123. Furthermore, the length of the end 110d is equal to or approximately equal to the width between the end 124c and the end 124d of the wall piece 124. The punching panel 110 has a plurality of through holes 111, which penetrate between the surface 112 and the surface 113. The plurality of through holes 111 are arranged in a matrix, as shown in FIGS.

[0044] As shown in FIGS. 2 to 4, the punched panel 110 is located between ends 120a and 120b of the wall portion 120, and the side wall portion 120 protrudes from the punched panel 110 toward both the sound source side and the fixed side. The punched panel 110 divides the space S defined by the wall portion 120 into two spaces: a space S1 on the sound source side and a space S2 on the fixed side. As shown in FIG. 2, the punched panel 110 extends along the ends 120a and 120b of the side wall portion 120. That is, the surfaces 112 and 113 of the punched panel 110 extend along the ends 120a and 120b of the side wall portion 120, respectively. For example, the punched panel 110 extends parallel or approximately parallel to the ends 120a and 120b of the side wall portion 120.

[0045] The punched panel 110 is also integrally connected to the side wall portion 120. Specifically, the end 110a of the punched panel 110 is integrally connected to the wall piece 121, the end 110b to the wall piece 122, the end 110c to the wall piece 123, and the end 110d to the wall piece 124. In other words, the ends 110a, 110b, 110c, and 110d are connection portions between the punched panel 110 and the wall pieces 121, 122, 123, and 124, respectively.

[0046] 1, 2, and 4, the membrane member 102 is attached to an end 120a of the side wall portion 120, covers the space S1, and faces the punched panel 110 from the sound source side across the space S1. Specifically, a surface 102b of the membrane member 102 faces a surface 112 of the punched panel 110 across the space S1. The membrane member 102 is attached to the end 120a of the side wall portion 120 by, for example, bonding with an adhesive or fixing using other fixing means.

[0047] The sound-absorbing structure 100 has the above-described configuration, in which the membrane member 102 and the space S1 form a spring-mass resonance system that resonates at a specific frequency, and the perforated panel 110 and the space S2 form a Helmholtz resonator that absorbs sound from the sound source. The resonance frequency of the spring-mass resonance system formed by the membrane member 102 and the space S1 can be adjusted by changing the surface density of the membrane member 102 or the volume of the space S1. For example, if the surface density of the membrane member 102 is low, the spring-mass vibration system resonates at a high frequency, and if the surface density of the membrane member 102 is high, the spring-mass vibration system resonates at a low frequency. In addition, the resonance frequency of the Helmholtz resonator formed by the perforated panel 110 and the space S2 can be adjusted by changing the diameter of the through-holes 111 in the perforated panel 110, the arrangement (pitch) of the through-holes 111, etc.

[0048] As described above, the sound-absorbing structural member 101 is formed from the sheet 1. The sheet 1 is, for example, a sound-absorbing structural sheet described below, and is a foldable sheet. The sheet 1 is, for example, a sheet made of cardboard, thick paper, or a resin sheet. Note that the material of the sheet 1 is not limited to cardboard, thick paper, or a resin sheet. The sheet 1 may also be another foldable sheet.

[0049] Next, a sound absorbing structure 103 according to a second embodiment of the present invention will be described. Fig. 5 is a perspective view showing the schematic configuration of sound absorbing structure 103 according to the second embodiment of the present invention, Fig. 6 is an exploded perspective view showing the schematic configuration of sound absorbing structure 103, and Fig. 7 is a cross-sectional view showing a cross section taken along line BB in Fig. 5. Below, with regard to the configuration of sound absorbing structure 103, the same reference numerals will be used to omit explanations of components that are the same as or have similar functions to those of the above-mentioned sound absorbing structure 100, and only components that differ from sound absorbing structure 100 will be described.

[0050] 5 to 7, the sound absorbing structure 103 includes a sound absorbing structural member 104, a membrane member 105, and a frame member 106. Fig. 8 is a perspective view showing the schematic configuration of the membrane member 105, Fig. 9 is a perspective view showing the schematic configuration of the sound absorbing structural member 104, and Fig. 10 is a plan view showing the schematic configuration of the sound absorbing structural member 104. Fig. 8 shows the membrane member 105 as seen from the fixed side, and Fig. 9 shows the sound absorbing structural member 104 as seen from the fixed side.

[0051] As shown in FIGS. 5 to 8 , the membrane member 105 is a member in which a frame-shaped member is attached to the membrane member 102, and has a membrane portion 107, which is a portion corresponding to the membrane member 102, and an edge portion 108, which is a ring-shaped portion extending from the end of the membrane portion 107 toward the fixed side. The membrane portion 107 has the same shape as the membrane member 102, is a flexible, thin membrane-like portion, and has a pair of back-to-back surfaces 107a and 107b. The surface 107a faces the sound source side, and the surface 107b faces the fixed side. The membrane portion 107 is designed to bend in the direction in which the surfaces 107a and 107b face, thereby causing the membrane portion 107 to vibrate. As shown in FIGS. 4 and 5 , the membrane portion 107 is, for example, rectangular or approximately rectangular, and has a pair of back-to-back ends 107c and 107d and a pair of back-to-back ends 107e and 107f. Ends 107e and 107f extend in a direction intersecting the direction in which ends 107c and 107d extend, respectively. For example, ends 107c and 107d extend linearly or substantially linearly, and ends 107e and 107f are perpendicular or substantially perpendicular to the direction in which ends 107c and 107d extend.

[0052] As shown in Figures 5 to 8, the edge portion 108 extends, for example, in a rectangular or approximately rectangular ring shape so as to surround a rectangular or approximately rectangular space. Furthermore, the edge portion 108 is, for example, perpendicular or approximately perpendicular to the film portion 107. Specifically, as shown in Figures 6 and 8, the edge portion 108 has edge pieces 108a and 108b that are portions that face each other across the space surrounded by the edge portion 108, and edge pieces 108c and 108d that are portions that face each other across the space surrounded by the edge portion 108. The edge portion 108 is integrally connected to the film portion 107, and ends 107c, 107d, 107e, and 107f are connection portions between the film portion 105 and the edge pieces 108a, 108b, 108c, and 108d, respectively.

[0053] 6, edge piece 108a extends from end 107c and has end 108aa facing away from end 107c and a pair of opposite ends 108ab and 108ac extending between end 107c and end 108aa. Similarly, edge piece 108b extends from end 107d and has end 108ba facing away from end 107d and a pair of opposite ends 108bb and 108bc extending between end 107d and end 108ba. Edge piece 108c extends from end 107e and has end 108ca facing away from end 107e and a pair of opposite ends 108cb and 108cc extending between end 107e and end 108ca. Edge piece 108d extends from end 107f and has end 108da facing away from end 107f and a pair of ends 108db and 108dc facing away from each other and extending between end 107f and end 108da. Edge pieces 108a, 108b, 108c, and 108d are each rectangular or approximately rectangular, as shown in Figures 6 and 8, for example. End 108aa of edge piece 108a, end 108ba of edge piece 108b, end 108ca of edge piece 108c, and end 108da of edge piece 108d are located on or near the same plane.

[0054] Ends 108ab and 108ac of edge piece 108a may be connected to or separate from end 108cc of edge piece 108c and end 108db of edge piece 108d, respectively. Similarly, ends 108bb and 108bc of edge piece 108b may be connected to or separate from end 108cb of edge piece 108c and end 108dc of edge piece 108d, respectively.

[0055] 5 to 7, the membrane member 105 covers the sound-absorbing structural member 104 from the sound source side and is sandwiched between a side wall portion 130 (described later) of the sound-absorbing structural member 104 and the frame member 106. For example, as shown in Figures 6 and 7, the edge pieces 108a, 108b, 108c, and 108d correspond to the side wall portions 121, 122, 123, and 124 of the side wall portion 130 (described later), respectively. More specifically, in the sound-absorbing structure 103, the edge pieces 108a, 108b, 108c, and 108d contact the side wall portions 121, 122, 123, and 124 from the outer periphery, respectively.

[0056] The membrane member 105 is made of the same material as the membrane member 102. The membrane portion 107 of the membrane member 105 is configured to vibrate like the membrane member 102. The surface density of the membrane portion 107 of the membrane member 105 is the same as the surface density of the membrane member 102, for example, 0.03 kg / m 2 More than 0.3kg / m 2 The surface density of the film portion 107 is not limited to the above values.

[0057] 6, 7, 9, and 10, the sound-absorbing structural member 104 has a perforated panel 110 of the above-described sound-absorbing structural member 101, and also has a side wall portion 130 that is different from the side wall portion 120 of the above-described sound-absorbing structural member 101. Unlike the side wall portion 120 of the sound-absorbing structural member 101, the side wall portion 130 of the sound-absorbing structural member 104 protrudes only toward the sound source from the perforated panel 110 and does not protrude toward the fixed side from the perforated panel 110, and does not form a space S3 on the fixed side of the perforated panel 110. In other words, in the side wall portion 130, the fixed-side ends 121b, 122b, 123b, and 124b of the wall pieces 121, 122, 123, and 124, respectively, overlap with the ends 110a, 110b, 110c, and 110d of the perforated panel 110.

[0058] In addition, the side wall portion 130 has support portions 131a, 131b, 132a, 132b, 133a, 133b, 134a, and 134b as fixed portions different from the fixed portions 125a, 125b, 126a, and 126b of the side wall portion 120. The support portions 131a, 131b, 132a, 132b, 133a, 133b, 134a, and 134b come into contact with the punched panel 110 and support the side wall portions 121, 122, 123, and 124 relative to the punched panel 110, as shown in FIGS.

[0059] 6, 9, and 10, the support portions 131a and 131b are integrally connected to the ends 121c and 121d of the wall piece 121, respectively, and extend inward (toward the space S1). The support portions 131a and 131b have ends 131aa and 131ba on the fixed side, respectively, which contact the surface 112 of the punched panel 110. Similarly, the support portions 132a and 132b are integrally connected to the ends 122c and 122d of the wall piece 122, respectively, and extend inward. The support portions 132a and 132b have ends 132aa and 132ba on the fixed side, respectively, which contact the surface 112 of the punched panel 110. The support portions 133a and 133b are integrally connected to the ends 123c and 123d of the wall piece 123, respectively, and extend inward. The support portions 133a and 133b have ends 133aa and 133ba on the fixed side, respectively, which contact the surface 112 of the punched panel 110. The support portions 134a and 134b are integrally connected to the ends 124c and 124d of the wall piece 124, respectively, and extend inward. The support portions 134a and 134b have ends 134aa and 134ba on the fixed side, respectively, which contact the surface 112 of the punched panel 110.

[0060] As described above, the support portions 131a and 131b are in contact with the surface 112 of the punched panel 110, support the wall piece 121 relative to the punched panel 110, and prevent the wall piece 121 from falling inward (toward the space S1). Similarly, the support portions 132a and 132b are in contact with the surface 112 of the punched panel 110, support the wall piece 122 relative to the punched panel 110, and prevent the side wall portion 122 from falling inward. Furthermore, the support portions 133a and 133b are in contact with the surface 112 of the punched panel 110, support the wall piece 123 relative to the punched panel 110, and prevent the wall piece 123 from falling inward. Furthermore, the support portions 134a and 134b are in contact with the surface 112 of the punched panel 110, and support the wall piece 124 relative to the punched panel 110, preventing the wall piece 124 from falling inward.

[0061] Furthermore, each of the wall pieces 121, 122, 123, and 124 is not connected in the circumferential direction to an adjacent one of the wall pieces 121, 122, 123, and 124. Specifically, the ends 121c and 121d of the wall piece 121 are not connected to or in contact with the end 124d of the wall 124 and the end 124c of the side wall 123, respectively. Furthermore, the ends 122c and 122d of the side wall 122 are not connected to or in contact with the end 123d of the side wall 123 and the end 124c of the side wall 124, respectively. Each of the support portions 131a, 131b, 132a, 132b, 133a, 133b, 134a, and 134d may or may not be in contact with an adjacent one of the support portions 131a, 131b, 132a, 132b, 133a, 133b, 134a, and 134d in the circumferential direction.

[0062] The frame member 106 is a member for supporting the side wall portions 130 of the sound-absorbing structural member 104 and for fixing the membrane member 105, which covers the sound-absorbing structural member 104 from the sound source side, to the sound-absorbing structural member 104. The frame member 106 can clamp the edge portion 108 of the membrane member 105 between itself and the side wall portions 130 of the sound-absorbing structural member 104. The frame member 106 has a shape corresponding to the side wall portions 130 of the sound-absorbing structural member 104, and extends in a rectangular or approximately rectangular ring shape so as to surround a rectangular or approximately rectangular space, as shown in Figures 5 and 6. Specifically, the edge portion 108 has frame member pieces 106a and 106b, which are portions that face each other across the space surrounded by the frame member 106, and frame member pieces 106c and 106d, which are portions that face each other across the space surrounded by the frame member 106, as shown in Figures 5 and 6.

[0063] 6, for example, frame member pieces 106a, 106b, 106c, and 106d correspond to wall pieces 121, 122, 123, and 124, respectively, of the side wall portion 130. Specifically, for example, in the sound absorbing structure 103, the frame member pieces 106a, 106b, 106c, and 106d are in contact with the wall pieces 121, 122, 123, and 124 from the outer periphery via edge pieces 108a, 108b, 108c, and 108d of the edge portion 108 of the membrane member 105, respectively. Furthermore, as long as the frame member 106 can fix the membrane member 105 together with the side wall portion 130 of the sound-absorbing structural member 104, it is not necessary for all of the frame member pieces 106a, 106b, 106c, and 106d to be in contact with the wall pieces 121, 122, 123, and 124 from the outer periphery via the edge pieces 108a, 108b, 108c, and 108d of the edge portion 108 of the membrane member 105.

[0064] 6 and 7, the end 106e of the frame member 106, which is the end on the sound source side, extends so as to coincide or substantially coincide with the end 120a of the side wall 130 of the sound-absorbing structural member 104 in the sound-absorbing structure 103, for example, when viewed from the outer periphery. The end 106f of the frame member 106, which is the end on the fixed side, extends along the end 106e. The end 106f of the frame member 106 extends, for example, parallel or substantially parallel to the end 106e. As shown in FIG. 7, the width between the ends 106e and 106f of the frame member 106 is greater than the width between the ends 120a and 120b of the side wall 130 of the sound-absorbing structural member 104, and in the sound-absorbing structure 103, the end 106f of the frame member 106 is located closer to the fixed side than the end 120b of the side wall 130 of the sound-absorbing structural member 104.

[0065] The frame member pieces 106a, 106b, 106c, and 106d of the frame member 106 may be integrally connected or may be connected by adhesive or the like. When the frame member pieces 106a, 106b, 106c, and 106d are connected by adhesive or the like, the frame member pieces 106a, 106b, 106c, and 106d each have a connecting piece (not shown) for connection. The connecting piece extends, for example, in the circumferential direction from each of the frame member pieces 106a, 106b, 106c, and 106d, and is a portion to which adhesive is applied. Note that any of the frame member pieces 106a, 106b, 106c, and 106d may be integrally connected, and those that are not integrally connected may be connected by adhesive or the like.

[0066] The frame member 106 is formed from a bendable sheet material, for example, the same sheet material as the sound absorbing structural members 103 and 104. However, the material of the frame member 106 is not limited to a bendable sheet material.

[0067] Fig. 11 is a perspective view of a sound-absorbing structure 103 having a modified frame member 106. As shown in Fig. 11, the frame member 106 may have fixing pieces 106g, 106h, 106i, and 106j extending from ends 106aa, 106ba, 106ca, and 106da of frame member pieces 106a, 106b, 106c, and 106d, respectively. Note that the ends 106aa, 106ba, 106ca, and 106da of frame member pieces 106a, 106b, 106c, and 106d, respectively, are fixed-side ends of frame member pieces 106a, 106b, 106c, and 106d, and are part of end 106f of the frame member 106. The fixing pieces 106g, 106h, 106i, and 106j extend, for example, along a plane. The fixing pieces 106g, 106h, 106i, and 106j may have various shapes depending on the shape of the object to which the sound absorbing structure 103 is attached.

[0068] 6 and 7, in the sound-absorbing structure 103, the sound-absorbing structural member 104 is housed in a space defined by the membrane member 105 from the fixed side, and the membrane member 105 covers the side wall portion 130 from the sound source side and the outer periphery side. The frame member 106 and the side wall portion 130 sandwich the membrane member 105, and the membrane member 105 is fixed to the sound-absorbing structural member 104. In the sound-absorbing structure 103, as in the sound-absorbing structure 100 described above, the membrane portion 107 of the membrane member 105 covers the space S1 and faces the perforated panel 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 panel 110 across the space S1.

[0069] Also, as shown in Figure 7, in the sound-absorbing structure 103, the fixed end 106f of the frame member 106 is located on the fixed side of the punched panel 110, and the frame member 106 and the punched panel 110 define a space S2 on the fixed side of the punched panel 110.

[0070] In this way, in the sound absorbing structure 103 as well, the membrane member 105 and the space S1 form a spring-mass resonant system that resonates at a specific frequency, and the punched panel 110 and the space S2 form a Helmholtz resonator. Therefore, the sound absorbing structure 103 according to the second embodiment of the present invention also exhibits sound absorbing properties similar to the sound absorbing structure 100 described above.

[0071] 11, the sound absorbing structure 103 can be attached to the object by fixing the fixing pieces 106g, 106h, 106i, and 106j to the object. The fixing pieces 106g, 106h, 106i, and 106j can be fixed to the object by adhesive or other fixing means such as screws. The fixing pieces 106g, 106h, 106i, and 106j may be provided with through holes for fixing with fixing means such as screws.

[0072] Next, a description will be given of a modified sound absorbing structural member 104 of the sound absorbing structure 103 according to the second embodiment of the present invention. Fig. 12 is a perspective view showing a sound absorbing structural member 109 which is a modified sound absorbing structural member 104 of the sound absorbing structure 103. As shown in Fig. 12, the side wall portion 130 of the sound absorbing structural member 109 according to the modified sound absorbing structural member 104 has support portions 135a, 135b, 136a, 136b, 137a, 137b, 138a, and 138b which are different from the support portions 131a, 131b, 132a, 132b, 133a, 133b, 134a, and 134d.

[0073] The support portions 135a and 135b are each plate-shaped portions extending from the wall piece 121 along the ends 121c and 121d of the wall piece 121 from the end 121b toward the fixed side. The support portions 135a and 135b are each integrally connected to the wall piece 121. The thicknesses of the support portions 135a and 135b are each the same as or approximately the same as the thickness of the wall piece 121. The support portions 136a and 136b have the same shape as the support portions 135a and 135b, and are each plate-shaped portions extending from the wall piece 122 along the ends 122c and 122d of the wall piece 122 from the end 122b toward the fixed side. The support portions 136a and 136b are each integrally connected to the wall piece 122. The thicknesses of the support portions 136a and 136b are each the same as or approximately the same as the thickness of the wall piece 122.

[0074] The support portions 137a and 137b are plate-like portions that extend inward (toward the space S1) from the ends 123c and 123d of the wall piece 123 in the direction in which the wall piece 123 faces. Furthermore, the support portions 137a and 137b extend further toward the fixed side than the punched panel 110. For example, the support portions 137a and 137b extend toward the fixed side to the same or approximately the same positions as the support portions 135a and 136a. Furthermore, the support portions 137a and 137b extend inward so as to overlap the support portions 135a and 136a from the inside. Furthermore, the support portions 137a and 137b contact the panel 110 from the outside. The support portions 137a and 137b are each integrally connected to the wall piece 123. The thickness of the support portions 137a and 137b is the same as or approximately the same as the thickness of the wall piece 123. The support portions 138a and 138b have the same shape as the support portions 137a and 137b, respectively, and are plate-like portions extending inward (toward the space S1) from the ends 124c and 124d of the wall piece 124 in the direction facing the side wall portion 124. Furthermore, the support portions 138a and 138b each extend toward the fixed side beyond the punched panel 110. For example, the support portions 138a and 138b each extend toward the fixed side to the same or approximately the same positions as the support portions 135b and 136b. Furthermore, the support portions 138a and 138b extend inward so as to overlap the support portions 135b and 136b from the inside. Furthermore, the support portions 138a and 138b each contact the panel 110 from the outside. The support portions 138a and 138b are each integrally connected to the side wall portion 124. The thickness of the support portions 138a and 138b is the same as or approximately the same as the thickness of the wall piece 124.

[0075] As described above, the support portions 138b and 137a overlap the support portions 135a and 135b from the inside, respectively, and are in contact with the punched panel 110 from the outside. As a result, the end 121c side of the wall piece 121 is supported from the inside by the support portions 135a and 138b, and the end 121d side of the wall piece 121 is supported from the inside by the support portions 135b and 137a. Furthermore, the support portions 137b and 138a overlap the support portions 136a and 136b from the inside, respectively, and are in contact with the punched panel 110 from the outside. As a result, the end 122c side of the wall piece 122 is supported from the inside by the support portions 136a and 137b, and the end 122d side of the wall piece 122 is supported from the inside by the support portions 136b and 138a. In this way, the wall pieces 121, 122 are supported and prevented from falling inward.

[0076] Furthermore, in the sound absorbing structure 103, the support members 137a, 137b, 138a, and 138b each come into contact with the frame member 106. Therefore, the wall pieces 123 and 124 are supported by the support members 137a, 137b, 138a, and 138b and the frame member 106, preventing the wall pieces 123 and 124 from falling inward.

[0077] In the sound absorbing structure 103 in which the sound absorbing structural member 109 is used, for example, fixed-side ends 135aa, 135ba, 136aa, 136ba, 137aa, 137ba, 138aa, and 138ba of the support members 135a, 135b, 136a, 136b, 137a, 137b, 138a, and 138b overlap with the fixed-side end 106f of the frame member 106. In other words, the protrusion width of the support members 135a, 135b, 136a, 136b, 137a, 137b, 138a, and 138b from the punched panel 110 determines the width of the space S2 in the height direction.

[0078] Next, a sound-absorbing structure sheet 1 according to a first embodiment of the present invention will be described. The sound-absorbing structure sheet 1 (hereinafter also referred to as sheet 1) is a foldable sheet that forms the sound-absorbing structural member 101 of the sound-absorbing structure 100 according to the first embodiment of the present invention. FIG. 13 is a plan view of the sheet 1. As shown in FIG. 13, the sheet 1 has a specific shape and has a front surface 1a and a back surface 1b that face each other. The sheet 1 is formed from a sheet material. The sheet material that forms the sheet 1 is, for example, a sheet made of cardboard, thick paper, or resin. Note that the sheet material that forms the sheet 1 is not limited to sheets made of cardboard, thick paper, or resin. The sheet material that forms the sheet 1 may also be another foldable sheet. The sheet 1 is integrally formed from a sheet material and has, for example, a uniform or approximately uniform thickness. The sheet 1 is formed, for example, by cutting a sheet material having a uniform or approximately uniform thickness. In the following description, the sheet 1 is made of cardboard.

[0079] As shown in FIG. 13 , the sheet 1 includes a punched panel portion 10 forming a punched panel 110 having a plurality of through holes 111, a pair of first side wall portions 20, 30 forming a pair of opposing first side wall wall pieces 121, 122, and a pair of second side wall portions 40, 50 forming a pair of opposing second side wall wall pieces 123, 124. The punched panel portion 10 has a pair of first end portions 11, 12 facing back to back, and a pair of second end portions 13, 14 extending in a direction intersecting the first end portions 11, 12. The pair of first side wall portions 20, 30 are foldably connected to the pair of first end portions 11, 12 of the punched panel portion 10, respectively. The pair of second side wall portions 40, 50 are foldably connected to the pair of second end portions 13, 14 of the punched panel portion 10, respectively. The pair of first side wall portions 20, 30 are each bendable in the direction in which the punched panel 110 faces, so that the punched panel 110 is positioned between a pair of ends 121a, 121b and a pair of ends 122a, 122b of the wall pieces 121, 122, respectively. The pair of second side wall portions 40, 50 are each bendable in the direction in which the punched panel 110 faces, so that the punched panel 110 is positioned between a pair of ends 123a, 123b and a pair of ends 124a, 124b of the wall pieces 123, 124, respectively. The structure of the sheet 1 will be described in detail below. For ease of explanation, an x-axis and a y-axis perpendicular to the x-axis are shown in FIG. 13 to indicate directions.

[0080] 13, the perforated panel portion 10 has the form of a perforated panel 110 of the sound-absorbing structural member 101, and has ends 110a, 110b, 110c, and 110d, a plurality of through holes 111, and surfaces 112 and 113. The ends 110a and 110b are included in first ends 11 and 12 of the perforated panel portion 10, respectively, and the ends 110c and 110d are included in second ends 13 and 14 of the perforated panel portion, respectively. As shown in FIG. 13, the perforated panel portion 10 is, for example, a rectangular or approximately rectangular plate-like shape, with the first ends 11 and 12 extending linearly or approximately linearly along the x-axis and the second ends 13 and 14 extending linearly or approximately linearly along the y-axis, perpendicular or approximately perpendicular to the first ends 11 and 12.

[0081] As shown in FIG. 13, the first side wall portions 20, 30 each have a plurality of side wall panels 21, 31 extending along the first end portions 11, 12 (x-axis direction). The plurality of side wall panels 21, 31 extend outward from the first end portions 11, 12. The second side wall portions 40, 50 each have a plurality of side wall panels 41, 51 extending along the second end portions 13, 14 (y-axis direction). The plurality of side wall panels 41, 51 extend outward from the second end portions 13, 14. The "outward" refers to the side away from the punched panel portion 10 in the x-axis direction or y-axis direction. The side wall panels 21, 31, 41, 51 are, for example, rectangular or approximately rectangular plate-shaped. In each of the first side wall portions 20, 30, the multiple side wall panels 21, 31 are foldably connected in the extension direction (y-axis direction) from the first ends 11, 12 of the first side wall portions 20, 30. In each of the second side wall portions 40, 50, the multiple side wall panels 41, 51 are foldably connected in the extension direction (x-axis direction) from the second ends 13, 14 of the second side wall portions 40, 50.

[0082] The first side wall portion 20 and the first side wall portion 30 are the same or substantially the same, and the following mainly describes the configuration of the first side wall portion 20, but the description of the first side wall portion 20 can also be applied to the configuration of the first side wall portion 30, and can be used as a description of the first side wall portion 30. Similarly, the second side wall portion 40 and the second side wall portion 50 are the same or substantially the same, and the following mainly describes the configuration of the second side wall portion 40, but the description of the second side wall portion 40 can also be applied to the configuration of the second side wall portion 50, and can be used as a description of the second side wall portion 50.

[0083] The first side wall portion 20 has a uniform or approximately uniform width in a direction perpendicular to the extension direction (y-axis direction) from the first end portion 11. The multiple side wall panels 21 of the first side wall portion 20 include a first inner wall panel 22 that is foldable on one side of the direction in which the perforated panel portion 10 faces, specifically, in the direction in which the surface 113 faces (the fixed side of the sound-absorbing structural member 101) (hereinafter also referred to as the fixed side), and an outer wall panel 23 that is foldable on the other side of the direction in which the perforated panel portion 10 faces relative to the first inner wall panel 22, specifically, in the direction in which the surface 112 faces (the sound source side of the sound-absorbing structural member 101) (hereinafter also referred to as the sound source side). The first inner wall panel 22 is connected to the first end portion 11. A width h12 of the outer wall panel 23 in the extension direction (y-axis direction) of the first side wall portion 20 is wider than a width h11 of the first inner wall panel 22 in the extension direction. 13, the extension direction of the first side wall portion 20 is, for example, a direction (y-axis direction) perpendicular to the first end portion 11, and the width h11 of the first interior wall panel 22 and the width h12 of the exterior wall panel 23 are each widths in a direction perpendicular to the first end portion 11. The width h11 of the first interior wall panel 22 is uniform or approximately uniform throughout the extension direction (x-axis direction). Similarly, the width h12 of the exterior wall panel 23 is uniform or approximately uniform throughout the extension direction (x-axis direction).

[0084] As described above, the width h11 is smaller than the width h12. Therefore, in the sound-absorbing structural member 101 formed from the sheet 1, the perforated panel 110 is located between the heightwise ends 120a and 120b of the side wall 120. The heightwise direction is the direction between the sound source side and the fixed side, e.g., the direction perpendicular to the surface 112 or 113 of the perforated panel 110. The width h11 determines the heightwise width of the space S2 of the sound-absorbing structural member 101. The combination of the widths h11 and h12 (h12-h11) determines the heightwise width of the space S1 of the sound-absorbing structural member 101. The width h12 determines the heightwise width of the sound-absorbing structural member 101 (side wall 120). Therefore, by adjusting the width h11, the resonant frequency of the spring-mass vibration system of the sound-absorbing structure 100 can be adjusted. Furthermore, by adjusting the values ​​of the widths h11 and h12, the resonant frequency of the Helmholtz resonator of the sound absorbing structure 100 can be adjusted.

[0085] Specifically, the first end 11 has a structure that allows the first side wall portion 20 to be easily folded toward the fixed side relative to the punched panel portion 10. For example, the first end 11 has a groove on the back surface 1b that is recessed toward the front surface 1a as a structure that facilitates folding. In addition to the groove on the back surface 1b, the first end 11 may also have a groove on the front surface 1a that is opposite the groove on the back surface 1b as a structure that facilitates folding. Furthermore, the first end 11 may also have a groove on only the front surface 1a that is recessed toward the back surface 1b as a structure that facilitates folding. Note that the structure that facilitates folding is not limited to the groove described above. Hereinafter, such a structure that facilitates folding will be referred to as a fold structure.

[0086] 13, for example, the first side wall portion 20 has, as one of the plurality of side wall panels 21, a second inner wall panel 24 that can be bent toward the sound source relative to the outer wall panel 23. The width h13 in the extension direction of the second inner wall panel 24 is smaller than the width h12 of the outer wall panel 23. The width h13 in the extension direction of the second inner wall panel 24 is, for example, sized so that, as will be described later, the plurality of first side wall panels 21 of the first side wall portion 20 are bent and the second inner wall panel 24 comes into contact with the surface 112 of the punched panel 110. The width h13 of the second inner wall panel 24 is uniform or approximately uniform throughout the extension direction (x-axis direction).

[0087] The first side wall portion 20 also has end panels 25, 26 as one of the multiple side wall panels 21. The end panel 25 extends between the first interior wall panel 22 and the exterior wall panel 23, and the end panel 26 extends between the exterior wall panel 23 and the second interior wall panel 24. The end panel 25 is connected to the first interior wall panel 22 via a fold structure 27a and to the exterior wall panel 23 via a fold structure 27b. The fold structure 27a allows the end panel 25 to be folded toward the sound source relative to the first interior wall panel 22, and the fold structure 27b allows the exterior wall panel 23 to be folded toward the sound source relative to the end panel 25. The end panel 26 is connected to the exterior wall panel 23 via a fold structure 27c and to the second interior wall panel 24 via a fold structure 27d. The fold structure 27c allows the end panel 26 to be folded toward the sound source relative to the outer wall panel 23, and the fold structure 27d allows the second inner wall panel 24 to be folded toward the sound source relative to the end panel 26.

[0088] Each of the side wall panels 21 of the first side wall portion 20, i.e., 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 a rectangular or approximately rectangular plate. The first side wall portion 20 is a portion that forms the wall piece 121 of the side wall portion 120 of the sound-absorbing structural member 101. Specifically, the first inner wall panel 22 forms the inner portion of the wall piece 121 that defines the space S2, the outer wall panel 23 forms the outer portion of the wall piece 121, and the second inner wall panel 24 forms the inner portion of the wall piece 121 that defines the space S1. 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.

[0089] 13 , the first side wall portion 30 has a side wall panel 31, a first inner wall panel 32, an outer wall panel 33, a second inner wall panel 34, end panels 35, 36, and folding structures 37a, 37b, 37c, and 37d that correspond to the side wall panel 21, the first inner wall panel 22, the outer wall panel 23, the second inner wall panel 24, the end panels 25, 26, and folding structures 27a, 27b, 27c, and 27d of the first side wall portion 20. The first side wall portion 30 is a portion that forms the wall piece 122 of the side wall portion 120 of the sound-absorbing structural member 101, with the first inner wall panel 32 forming the inner portion of the wall piece 122 that defines the space S2, the outer wall panel 33 forming the outer portion of the wall piece 122, and the second inner wall panel 34 forming the inner portion of the wall piece 122 that defines the space S1. Additionally, end panel 35 forms end 122 b of wall piece 122 , and end panel 36 forms end 122 a of wall piece 122 .

[0090] The second side wall portion 40 has a uniform or approximately uniform width in a direction perpendicular to the extension direction (x-axis direction) from the second end portion 13. The multiple side wall panels 41 of the second side wall portion 40 include a first inner wall panel 42 that can be folded on one side of the direction in which the perforated panel portion 10 faces, specifically toward the fixed side, and an outer wall panel 43 that can be folded on the other side of the direction in which the perforated panel portion 10 faces relative to the first inner wall panel 42, specifically toward the sound source side. The first inner wall panel 42 is connected to the second end portion 13. A width h22 of the outer wall panel 43 in the extension direction of the second side wall portion 40 is wider than a width h21 of the first inner wall panel 42 in the extension direction. 13, the extension direction of the second side wall portion 40 is, for example, a direction (x-axis direction) perpendicular to the second end portion 13, and the width h21 of the first interior wall panel 42 and the width h22 of the exterior wall panel 43 are the respective widths in the direction perpendicular to the second end portion 13. The width h21 of the first interior wall panel 42 and the width h22 of the exterior wall panel 43 are the same as or approximately the same as the width h11 of the first interior wall panel 22 and the width h12 of the exterior wall panel 23 of the first side wall portion 20, respectively.

[0091] The widths h21 and h11 are the same or approximately the same, and the widths h22 and h12 are the same or approximately the same. Therefore, as described above, in the sound-absorbing structural member 101 formed from the sheet 1, the perforated panel 110 is located between the ends 120a and 120b of the side wall 120 in the height direction. The width h21, like the width h11, determines the width of the space S2 in the height direction of the sound-absorbing structural member 101. The widths h21 and h22 (h22-h21), like the widths h11 and h12 (h12-h11), determine the width of the space S1 in the height direction of the sound-absorbing structural member 101. The width 22, like the width 12, determines the width of the sound-absorbing structural member 101 (side wall 120) in the height direction. Therefore, by adjusting the values ​​of the widths h11 and h21, the resonant frequency of the spring-mass vibration system of the sound-absorbing structure 100 can be adjusted. Furthermore, by adjusting the values ​​of the widths h11 and h12 and the values ​​of the widths h21 and h22, the resonance frequency of the Helmholtz resonator of the sound absorbing structure 100 can be adjusted.

[0092] Specifically, for example, the second end 13 has the above-mentioned fold structure that allows the second side wall portion 40 to be easily folded toward the sound source side relative to the punched panel portion 10. The second end 13 has the fold structure on the rear surface 1b side, or on the front surface 1a side and the rear surface 1b side facing each other. The second end 13 may also have the fold structure only on the front surface 1a side.

[0093] 13, for example, the second side wall portion 40 has, as one of the plurality of side wall panels 41, a second inner wall panel 44 that can be bent toward the sound source relative to the outer wall panel 43. The width h23 in the extension direction of the second inner wall panel 44 is smaller than the width h22 of the outer wall panel 43. The width h23 in the extension direction of the second inner wall panel 44 is sized so that, for example, as described below, the plurality of first side wall panels 41 of the second side wall portion 40 are bent and the second inner wall panel 44 comes into contact with the surface 112 of the punched panel 110.

[0094] The second side wall portion 40 also has end panels 45, 46 as one of the multiple side wall panels 41. The end panel 45 extends between the first interior wall panel 42 and the exterior wall panel 43, and the end panel 46 extends between the exterior wall panel 43 and the second interior wall panel 44. The end panel 45 is connected to the first interior wall panel 42 via a fold structure 47a and to the exterior wall panel 43 via a fold structure 47b. The fold structure 47a allows the end panel 45 to bend toward the sound source relative to the first interior wall panel 42, and the fold structure 47b allows the exterior wall panel 43 to bend toward the sound source relative to the end panel 45. The end panel 46 is connected to the exterior wall panel 43 via a fold structure 47c and to the second interior wall panel 44 via a fold structure 47d. The fold structure 27c allows the end panel 46 to be bent toward the sound source relative to the outer wall panel 43, and the fold structure 47d allows the second inner wall panel 44 to be bent toward the sound source relative to the end panel 46.

[0095] Each side wall panel 41 of the second side wall portion 40, i.e., 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 a rectangular or approximately rectangular plate. The second side wall portion 40 is a portion that forms the wall piece 123 of the side wall portion 120 of the sound-absorbing structural member 101. Specifically, the first inner wall panel 42 forms the inner portion of the wall piece 123 that defines the space S2, the outer wall panel 43 forms the outer portion of the wall piece 123, and the second inner wall panel 44 forms the inner portion of the wall piece 123 that defines the space S1. 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.

[0096] 13 , the second side wall portion 50 has a side wall panel 51, a first inner wall panel 52, an outer wall panel 53, a second inner wall panel 54, end panels 55, 56, and folding structures 57a, 57b, 57c, and 57d that correspond to the side wall panel 41, the first inner wall panel 42, the outer wall panel 43, the second inner wall panel 44, end panels 45, 46, and folding structures 47a, 47b, 47c, and 47d of the second side wall portion 40. The second side wall portion 50 is a portion that forms the wall piece 124 of the side wall portion 120 of the sound-absorbing structural member 101, with the first inner wall panel 52 forming the inner portion of the wall piece 124 that defines the space S2, the outer wall panel 53 forming the outer portion of the wall piece 124, and the second inner wall panel 54 forming the inner portion of the wall piece 124 that defines the space S1. Additionally, end panel 55 forms end 124 b of wall piece 124 , and end panel 56 forms end 124 a of wall piece 124 .

[0097] 13, the second side wall 40 has a fixing portion 48 that fixes the second side wall 40 to the first side wall 20, 30. Similarly, the second side wall 50 has a fixing portion 48 that fixes the second side wall 50 to the first side wall 20, 30. The fixing portion 48 constitutes fixing portions 125a, 125b, 126a, 126b of the sound-absorbing structural member 101. In the second side wall 40, the fixing portion 48 is capable of fixing the second side wall 40 to the first side wall 20 so that an end 123c of the wall piece 123 in the extension direction along the second end portion 13 faces an end 121d of the adjacent wall piece 121 in the extension direction along the first end portion 11. In addition, the fixing portion 48 is capable of fixing the second side wall portion 40 to the first side wall portion 30 so that the end 123d in the extension direction along the second end portion 13 of the wall piece 123 faces the end 122c in the extension direction along the first end portion 12 of the adjacent wall piece 122.

[0098] Furthermore, in the second side wall portion 50, the fixing portion 48 is capable of fixing the second side wall portion 50 to the first side wall portion 30 so that an end 124c of the wall piece 124 in the extension direction along the second end portion 14 faces an end 122d of the adjacent wall piece 122 in the extension direction along the first end portion 12. Furthermore, the fixing portion 48 is capable of fixing the second side wall portion 50 to the first side wall portion 20 so that an end 124d of the wall piece 124 in the extension direction along the second end portion 14 faces an end 121c of the adjacent wall piece 121 in the extension direction along the first end portion 11.

[0099] 13, in the second side wall 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, 43b in a direction along the second end portion 13 of the exterior wall panel 43. The second fixing portion 48b extends from a pair of ends 44a, 44b in a direction along the second end portion 13 of the second interior wall panel 44. The first fixing portion 48a has a main body portion 48aa and claw portions 48ab, 48ac extending from the main body portion 48aa. The claw 48ab extends in a direction along the second end portion 13, and the claw 48ac extends in a direction perpendicular to the second end portion 13. The main body portion 48aa can be bent toward the sound source with respect to the exterior wall panel 43, and the claw portion 48ab can be bent toward the sound source with respect to the main body portion 48aa. The second fixing portion 48b has a recessed portion 48ba that is recessed inward.

[0100] The main body 48aa and the claws 48ab of the first fixing part 48a are each formed so that the claws 48ab can enter the slits 22a of the first inner wall panel 22 of the first side wall part 20 or the slits 32a of the first inner wall panel 32 of the second side wall part 30 during the assembling process of the sound absorbing structural member 101, which will be described later. Furthermore, the main body 48aa and the claws 48ac of the first fixing part 48a are each formed so that the claws 48a can be accommodated in the recesses 48ba of the second fixing part 48b of the same fixing part 48 during the assembling process of the sound absorbing structural member 101, which will be described later.

[0101] The second side wall portion 50 also has fixing portions 48. That is, the first fixing portions 48a extend from a pair of ends 53a, 53b of the outer wall panel 53 in a direction along the second end portion 14. The second fixing portions 48b extend from a pair of ends 54a, 54b of the second inner wall panel 54 in a direction along the second end portion 14.

[0102] 13, recesses 24c, 24d for accommodating the fixing portion 48 of the sound-absorbing structural member 101 are formed at the ends 24a, 24b of the second interior wall panel 24 of the first side wall portion 20. Similarly, recesses 34c, 34d for accommodating the fixing portion 48 of the sound-absorbing structural member 101 are formed at the ends 34a, 34b of the second interior wall panel 34 of the first side wall portion 30. The ends 24a, 24b and the ends 34a, 34b are the ends of the second interior wall panels 24, 34 in the direction along the first ends 11, 12, respectively.

[0103] As shown in FIG. 13 , protrusions 24e and 24f are formed on the outer sides of the recesses 24c and 24d at the ends 24a and 24b of the second inner wall panel 24 of the first side wall portion 20, respectively, and protrude in a direction along the first end 11. Similarly, protrusions 34e and 34f are formed on the outer sides of the recesses 34c and 34d at the ends 34a and 34b of the second inner wall panel 34 of the first side wall portion 30, respectively, and protrude in a direction along the first end 12. As shown in FIG. 13 , slits 44c and 44d are formed on the outer sides of the ends 44a and 44b of the second inner wall panel 44 of the second side wall portion 40. The slits 44c and 44d are capable of receiving the protrusions 34f and 24e. Similarly, slits 54c and 54d are formed on the outer sides of the ends 54a and 54b of the second inner wall panel 54 of the second side wall portion 50. The slits 54c and 54d are capable of receiving the protrusions 24f and 34e.

[0104] The fold structures of the first ends 11 and 12, the fold structures of the second ends 13 and 14, and the fold structures 27a, 27b, 27c, 27d, 37a, 37b, 37c, 37d may be foldable in the direction opposite to the above-mentioned direction. In this case, the first interior wall panels 22, 32, 42, and 52 define a space S1 in the sound-absorbing structural member 101, and the second interior wall panels 24, 34, 44, and 54 define a space S2 in the sound-absorbing structural member 101. In addition, end panels 25 and 26 form ends 121a and 121b of side wall piece 121, end panels 35 and 36 form ends 122a and 122b of side wall piece 122, end panels 45 and 46 form ends 123a and 123b of side wall piece 123, and end panels 55 and 56 form ends 124a and 124b of side wall piece 124, respectively.

[0105] The sheet 1 has the above-described structure, and each portion is folded to form the sound-absorbing structural member 101. Figures 14 to 18 are views showing a part of the process of folding the sheet 1 to form the sound-absorbing structural member 101. In the process of folding the sheet 1 to form the sound-absorbing structural member 101, each fold is mainly at an angle of 90° or approximately 90°. However, the angle of each fold is not limited to 90°.

[0106] Specifically, in forming the sound-absorbing structural member 101, in the first side wall portion 20, the first inner wall panel 22 is folded outward according to the fold structure of the first end portion 11 (see FIG. 14), and each of the side wall panels 23 to 26 is folded inward according to the fold structures 27a to 27d (see FIGS. 15 to 18), thereby forming a wall piece 121 of the side wall portion 120. In the first side wall portion 30, the first inner wall panel 32 is folded outward according to the fold structure of the first end portion 12, and each of the side wall panels 33 to 36 is folded inward according to the fold structures 37a to 37d, thereby forming a wall piece 122 of the side wall portion 120. In the second side wall portion 40, the first inner wall panel 42 is folded outward according to the fold structure of the second end portion 13, and each of the side wall panels 43 to 46 is folded inward according to the fold structures 47a to 47d, thereby forming a wall piece 123 of the side wall portion 120. In the second side wall portion 50, the first inner wall panel 52 is folded outward according to the fold structure of the second end portion 14, and each of the side wall panels 53 to 56 is folded inward according to the fold structures 57a to 57d, thereby forming a wall piece 124 of the side wall portion 120. In addition, the first inner wall panels 22, 32, 42 are folded inward relative to the perforated panel portion 10, thereby forming a perforated panel 110 (see FIG. 14).

[0107] Furthermore, in the process of forming the wall pieces 121, 122, 123, 124, in the second side wall portion 40, the first inner wall panel 42 is bent outward relative to the punched panel portion 10, the end panel 45 is bent inward relative to the first inner wall panel 42, and the outer wall panel 43 is bent inward relative to the end panel 45, and then the claw portions 48ab of the first fixing portion 48a of the fixing portion 48 on the end 43b side are bent inward relative to the main body portion 48aa (see Figure 15), and when the main body portion 48aa is bent inward relative to the outer wall panel 43 (see Figure 16), the claw portions 48ab are accommodated in the slits 22a of the first inner wall panel 22 bent outward relative to the punched panel portion 10 of the first wall portion 20 (see Figure 16). This secures the first interior wall panel 22, the first interior wall panel 42, the end panel 45, and the exterior wall panel 43 to one another. Similarly, the claws 48ab of the first fixing portions 48a of the fixing portions 48 on the end 43a side are received in the slits 32a of the first interior wall panel 32. This secures the first interior wall panel 32, the first interior wall panel 42, the end panel 45, and the exterior wall panel 43 to one another.

[0108] Furthermore, in the second side wall portion 40, when the end panel 46 is folded inward relative to the outer wall panel 43 and the second inner wall panel 44 is folded inward relative to the end panel 46, and then the second fixing portion 48b of the fixing portion 48 on the end 43b side is folded inward relative to the second inner wall panel 44, the claw portion 48ac of the first fixing portion 48a, whose claw portion 48ab is housed in the slit 22a of the first inner wall panel 22, is housed in the recess 48ba of the second fixing portion 48b (see FIG. 16 ). As a result, the first fixing portion 48a and the second fixing portion 48b of the fixing portion 48 on the end 43b side engage with each other, and the first inner wall panel 22, the end panel 46, and the second inner wall panel 44 are fixed to one another. Similarly, in the fixing portion 48 on the end 43a side, the claw portion 48ab is accommodated in the slit 32a of the first interior wall panel 32, and the claw portion 48ac of the first fixing portion 48a is accommodated in the recess 48ba of the second fixing portion 48b, and the first interior wall panel 32, the end panel 46, and the second interior wall panel 44 are fixed to each other.

[0109] Furthermore, similarly to the second side wall portion 40, the claw portions 48ab of the first fixing portions 48a of the fixing portions 48 on the end 53a side of the exterior wall panel 53 at the second side end portion 50 are accommodated in the slits 22a of the first interior wall panel 22, and the claw portions 48ab of the first fixing portions 48a of the fixing portions 48 on the end 53b side of the exterior wall panel 53 at the second side end portion 50 are accommodated in the slits 32a of the first interior wall panel 32. As a result, the first interior wall panel 22, the first interior wall panel 52, the end panel 55, and the exterior wall panel 53 are fixed to one another, and the first interior wall panel 32, the first interior wall panel 52, the end panel 55, and the exterior wall panel 53 are fixed to one another.

[0110] Similarly to the second side wall portion 40, in the fastening portion 48 on the end 53a side of the exterior wall panel 53 of the second side end portion 50, the claw portion 48ac of the first fastening portion 48a is received in the recessed portion 48ba of the second fastening portion 48b. Similarly, in the fastening portion 48 on the end 53b side of the exterior wall panel 53 of the second side end portion 50, the claw portion 48ac of the first fastening portion 48a is received in the recessed portion 48ba of the second fastening portion 48b. This fixes the first interior wall panel 22, the end panel 56, and the second interior wall panel 54 to one another, and also fixes the first interior wall panel 32, the end panel 56, and the second interior wall panel 54 to one another.

[0111] Furthermore, when the second inner wall panels 44, 54 of the second side wall portions 40, 50 are bent inward relative to the first side wall portions 20, 30 that have been bent to form the wall pieces 121, 122, respectively, the protrusions 24e, 24f, 34e, 34f are accommodated in the corresponding slits 44d, 54c, 44c, 54d (see FIGS. 17 and 18). This secures the second inner wall panels 24, 34, 44, 54 to each other. In this state, the leading ends of the second inner wall panels 24, 34, 44, 54 face the surface (surface 1a) of the punched panel portion 10. For example, the leading ends of the second inner wall panels 24, 34, 44, 54 are in contact with the surface (surface 1a) of the punched panel portion 10.

[0112] As described above, the sound absorbing structural member 101 is formed from the sheet 1 by folding each portion of the sheet 1.

[0113] In this way, the sound-absorbing structural member 101 can be formed by folding the sheet-like sound-absorbing structural sheet 1. Therefore, the sound-absorbing structural member 101 can be stored in the form of the sheet-like sound-absorbing structural sheet 1. Therefore, the sound-absorbing structural member 101 can reduce the space required for storage.

[0114] As described above, the sound absorbing structural member 101 according to the first embodiment of the present invention and the sound absorbing structural sheet 1 according to the first embodiment of the present invention can be prevented from becoming bulky during storage.

[0115] Furthermore, a sheet set for a sound-absorbing structure can be made by combining the sheet 1 and the membrane member 102 of the sound-absorbing structure 100. The sheet set for a sound-absorbing structure can also be prevented from becoming bulky during storage.

[0116] Next, a sound-absorbing structure sheet 2 according to a second embodiment of the present invention will be described. In the description of the sound-absorbing structure sheet 2, components that are the same as or have the same functions as the above-described sheet 1 will be designated by the same reference numerals and will not be described again.

[0117] The sound-absorbing structure sheet 2 (hereinafter also referred to as sheet 2) is a foldable sheet that forms the sound-absorbing structural member 104 of the sound-absorbing structure 103 according to the second embodiment of the present invention. FIG. 19 is a plan view of the sheet 2. As shown in FIG. 19, the sheet 2 has a specific shape and has a front surface 2a and a back surface 2b that face each other. The sheet 2 is formed from the same sheet material that forms the sheet 1. The sheet 2 is integrally formed from the sheet material and has, for example, a uniform or approximately uniform thickness. The sheet 2 is formed, for example, by cutting a sheet material of a uniform or approximately uniform thickness. In the following description, the sheet 2 is assumed to be a cardboard sheet.

[0118] As shown in FIG. 19 , the sheet 2, like the sheet 1, includes a perforated panel portion 10, first side wall portions 20, 30, and second side wall portions 40, 50. The first side wall portions 20, 30 form wall pieces 121, 122, respectively, of the side wall portion 130 of the sound-absorbing structural member 104, and the second side wall portions 40, 50 form wall pieces 123, 124, respectively, of the side wall portion 130 of the sound-absorbing structural member 104. The first side wall portions 20, 30 are foldably connected to first end portions 11, 12, respectively, of the perforated panel portion 10. The second side wall portions 40, 50 are foldably connected to second end portions 13, 14, respectively, of the perforated panel portion 10. The first side wall portions 20, 30 are foldable in the direction facing the perforated panel 110. Additionally, the second side wall portions 40, 50 can each be bent in the direction facing the punching panel 110. The following describes in detail the configuration of the sheet 2. For ease of explanation, the x-axis and the y-axis perpendicular to the x-axis are shown in FIG.

[0119] 19, in the punched panel portion 10 of the sheet 2, the first end 11 is not connected to the second ends 13, 14, and similarly, the first end 12 is not connected to the second ends 13, 14. The first ends 11, 12 are shorter than the width between the second ends 13 and 14, and the second ends 13, 14 are shorter than the width between the first ends 11 and 12.

[0120] The first side wall portion 20 and the first side wall portion 30 are the same or substantially the same, and the following mainly describes the configuration of the first side wall portion 20, but the description of the first side wall portion 20 can also be applied to the configuration of the first side wall portion 30, and can be used as a description of the first side wall portion 30. Similarly, the second side wall portion 40 and the second side wall portion 50 are the same or substantially the same, and the following mainly describes the configuration of the second side wall portion 40, but the description of the second side wall portion 40 can also be applied to the configuration of the second side wall portion 50, and can be used as a description of the second side wall portion 50.

[0121] As shown in FIG. 19 , the first side wall portion 20 has one side wall panel 21, which is connected to the first end portion 11 and can be bent at the first end portion 11 toward the sound source side relative to the punched panel portion 10. The side wall panel 21 is a rectangular or approximately rectangular plate and has ends 21a, 21b, and 21c. The end 21a is the end of the side wall panel 21 facing away from the first end portion 11, and the ends 21b and 21c are ends in the extension direction (x-axis direction) of the side wall panel 21. The width h31 of the side wall panel 21 is uniform or approximately uniform throughout the extension direction (x-axis direction). The width h31 of the side wall panel 21 is the width between the first end portion 11 and the end 21a in the direction (y-axis direction) perpendicular to the extension direction of the side wall panel 21.

[0122] 19, the first side wall portion 20 has support pieces 28 that constitute support portions 131a, 131b of the sound-absorbing structural member 104 that support the side wall panel 21. The support pieces 28 extend in opposite directions from the ends 21b, 21c of the side wall panel 21 in the extension direction (x direction) of the side wall panel 21. The support pieces 28 are connected to the side wall panel 21 so as to be bendable toward the sound source relative to the side wall panel 21. An end 28a of the support piece 28 in the extension direction (x direction) faces inward and extends in a direction intersecting the extension direction of the side wall panel 21. For example, the end 28a is inclined at 45° or approximately 45° with respect to the extension direction of the first end portion 12. The end 28a of the support piece 28 is configured to contact the perforated panel portion 10 when the side wall panel 21 and the support piece 28 are bent.

[0123] 19, the first side wall portion 30 has a side wall panel 31 that corresponds to the side wall panel 21 of the first side wall portion 20. The first side wall portion 30 also has support pieces 28, similar to the first side wall portion 20. The support pieces 28 of the first side wall portion 30 constitute support portions 132a, 132b of the sound-absorbing structural member 104.

[0124] As shown in FIG. 19 , the second side wall portion 40 has one side wall panel 41, which is connected to the second end portion 13 and can be bent at the second end portion 13 toward the sound source side relative to the punched panel portion 10. The side wall panel 41 is a rectangular or approximately rectangular plate and has ends 41a, 41b, and 41c. The end 41a is the end of the side wall panel 41 facing away from the second end portion 13, and the ends 41b and 41c are ends in the extension direction (y-axis direction) of the side wall panel 41. The width h32 of the side wall panel 41 is uniform or approximately uniform throughout the extension direction (y-axis direction). The width h32 of the side wall panel 41 is the width between the second end portion 13 and the end 41a in the direction (y-axis direction) perpendicular to the extension direction of the side wall panel 41.

[0125] 19, the second side wall portion 40 has support pieces 28 that constitute support portions 133a, 133b of the sound-absorbing structural member 104 that support the side wall panel 41. The support pieces 28 extend in opposite directions from ends 41b, 41c of the side wall panel 41 in the extension direction (y-axis direction) of the side wall panel 41. The support pieces 28 are connected to the side wall panel 4 so as to be bendable toward the sound source relative to the side wall panel 4. The end 28a of the support piece 28 in the extension direction (y-axis direction) faces inward and extends in a direction intersecting the extension direction of the side wall panel 4. For example, the end 28a is inclined at 45° or approximately 45° with respect to the extension direction of the second portion 13. The end 28a of the support piece 28 is configured to contact the perforated panel portion 10 when the side wall panel 41 and the support piece 28 are bent.

[0126] 19, the second side wall portion 50 has a side wall panel 51 that corresponds to the side wall panel 41 of the second side wall portion 40. Similarly to the second side wall portion 40, the second side wall portion 50 also has a support piece 28. The support piece 28 of the second side wall portion 50 constitutes the support portions 134a, 134b of the sound-absorbing structural member 104.

[0127] 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 determine the width of the space S1 in the height direction of the sound absorbing structural member 104. Therefore, by adjusting the values ​​of the widths h31 and h32, the resonance frequency of the spring-mass vibration system of the sound absorbing structure 103 can be adjusted.

[0128] The sheet 2 has the above-described configuration, and each portion is folded to form the sound-absorbing structural member 101. In the folding process of the sheet 2 to form the sound-absorbing structural member 104, each fold is mainly at an angle of 90° or approximately 90°. However, the angle of each fold is not limited to 90°.

[0129] Specifically, in forming the sound-absorbing structural member 104, in the first side wall portion 20, the side wall panel 21 is folded outward according to the fold structure of the first end portion 11 (see FIGS. 6, 9, and 10 ), and the support pieces 28 are each folded toward the sound source relative to the side wall panel 21 (see FIGS. 6, 9, and 10 ), thereby forming a wall piece 121 of the side wall portion 130. As shown in FIGS. 6 and 10 , the end 28a of the folded support piece 28 contacts and supports the surface 112 of the punched panel 110, thereby preventing the side wall panel 21 from collapsing inward. Similarly, in the first side wall portion 30, the side wall panel 31 and the support piece 28 are each folded to form a wall piece 122 of the side wall portion 130. Similarly, in the second side wall portion 40, the side wall panel 41 and the support piece 28 are each folded to form a wall piece 123 of the side wall portion 130. Similarly, in the second side wall portion 50, the side wall panel 51 and the support piece 28 are folded to form the wall piece 124 of the side wall portion 130. In this manner, the sound-absorbing structural member 104 is formed from the sheet 2.

[0130] Next, we will explain a sound absorbing structure sheet 3, which is a modified example of the above-mentioned sound absorbing structure sheet 2. In the explanation of the sound absorbing structure sheet 3, components that have the same configuration or similar function as the above-mentioned sheet 2 will be designated by the same reference numerals and will not be explained again.

[0131] The sound absorbing structure sheet 3 (hereinafter also referred to as sheet 3) is a foldable sheet that forms a sound absorbing structure 109 (see FIG. 12), which is a modified example of the sound absorbing structural member 104 of the sound absorbing structure 103 according to the second embodiment of the present invention. FIG. 20 is a plan view of sheet 3. Sheet 3 differs from sheet 2 in that it does not have support piece 28 of sheet 2, but has a different support piece.

[0132] As shown in FIG. 20 , in the seat 3, the side wall panel 21 of the first side wall portion 20 has support pieces 29a, 29b that protrude inward at the end on the end 21b side and the end on the end 21c side, respectively. The support pieces 29a, 29b protrude beyond the first end 11. The support pieces 29a, 29b are connected to both ends of the first end 11. The punched panel portion 10 has inwardly recessed portions 15a, 15b formed in correspondence with the support pieces 29a, 29b. The support pieces 29a, 29b extend beyond the first end 11 along the ends 21b, 21c, respectively. The support pieces 29a, 29b form support portions 135a, 135b of the sound-absorbing structural member 109.

[0133] 20 , in the seat 3, the side wall panel 31 of the first side wall portion 30 has support pieces 29a and 29b, similar to the side wall panel 21 of the first side wall portion 20. The support piece 29a extends beyond the first end 12 along the ends 31b and 31c of the side wall panel 31, respectively. In addition, the punched panel portion 10 has inwardly recessed portions 15a and 15b formed corresponding to the support pieces 29a and 29b of the side wall panel 31. The support pieces 29a and 29b form support portions 136a and 136b of the sound-absorbing structural member 109.

[0134] 20, in the seat 3, the side wall panel 41 of the second side wall portion 40 has support pieces 38a and 38b connected to ends 41b and 41c, respectively. The support pieces 38a and 38b extend outward from ends 41b and 41c, respectively. End 38aa of the support piece 38a is continuously connected to end 41a of the side wall panel 41. Note that end 38aa is the outer end of the support piece 38a in the direction (x-axis direction) perpendicular to the extension direction (y-axis direction) of the side wall panel 41. The support piece 38a extends inward beyond the second end 13, and end 38ab of the support piece 38a is located more inward than the second end 13 in the direction (x-axis direction) perpendicular to the extension direction (y-axis direction) of the side wall panel 41. End 38ab is the inner end of support piece 38a in the direction (x-axis direction) perpendicular to the extension direction (y-axis direction) of side wall panel 41. Support piece 38b has the same shape as support piece 38a, and has ends 38ba and 38bb. Support pieces 38a and 38b can each be bent toward the sound source relative to side wall panel 41. Support pieces 38a and 38b of side wall panel 41 form support portions 137a and 138b of sound-absorbing structural member 109.

[0135] 20 , in the seat 3, the side wall panel 51 of the second side wall portion 50 has support pieces 38a and 38b, similar to the side wall panel 41 of the second side wall portion 40. The support pieces 38a and 38b extend outward from the ends 51b and 51c, respectively. Furthermore, the support pieces 38a and 38b can be bent toward the sound source relative to the side wall panel 51. The support pieces 38a and 38b of the side wall panel 51 form support portions 138a and 138b of the sound-absorbing structural member 109.

[0136] The widths h41 and h42 of the support pieces 29a and 29b, which are the protruding widths from the first ends 11 and 12, respectively, are the same or approximately the same. Furthermore, the widths h43 and h44 of the support pieces 38a and 38b, which are the protruding widths from the second ends 13 and 14, respectively, are the same or approximately the same. Furthermore, the widths h41 and h42 of the support pieces 29a and 29b and the widths h43 and h44 of the support pieces 38a and 38b are the same or approximately the same. The widths h41, h42, 43, and 44 determine the width of the space S2 in the height direction of the sound-absorbing structural member 104. Therefore, by adjusting the widths h41, h42, 43, and 44, the resonant frequency of the Helmholtz resonator of the sound-absorbing structure 103 can be adjusted.

[0137] 20, in the sheet 3, the second end 13 is shorter than the side wall panel 41, and the punched panel portion 10 has ends 16a and 16b that connect from both ends of the second end 13 to the adjacent recesses 15a and 15b, respectively. The ends 16a and 16b extend, for example, along the extension direction (x-axis direction) of the side wall panels 21 and 31, and are located more inward than the first end 11 and 12 in the extension direction (y-axis direction) of the side wall panel 41. Furthermore, a gap is formed between the ends 16a and 16b and the support pieces 38a and 38b in the extension direction (y-axis direction) of the side wall panel 41. Similarly, the second end 14 is shorter than the side wall panel 51, and the punched panel portion 10 has ends 16a and 16b that connect from both ends of the second end 14 to the adjacent recesses 15a and 15b, respectively.

[0138] The sheet 3 has the above-described configuration, and each portion is folded to form the sound-absorbing structural member 109. Fig. 21 shows a part of the process of folding the sheet 3 to form the sound-absorbing structural member 109. In the process of folding the sheet 3 to form the sound-absorbing structural member 109, each fold is mainly at an angle of 90° or approximately 90°. However, the angle of each fold is not limited to 90°.

[0139] Specifically, the sound-absorbing structural member 109 is formed by folding the side wall panel 21 inward in accordance with the fold structure of the first end 11 in the first side wall portion 20 (see FIG. 21), and folding the side wall panel 31 in the second side wall portion 30 in accordance with the fold structure of the first end 12 (see FIG. 21). As a result, the wall pieces 121 and 122 of the side wall portion 130 are formed, and the support portions 135a, 135b, 136a, and 136b protrude further toward the fixed side than the punched panel portion 10.

[0140] Next, in the second side wall portion 40, the side wall panel 41, in which the support pieces 38a, 38b are folded inward relative to the side wall panel 41 (see FIG. 21), is folded inward according to the folding structure of the second end portion 13. Also, in the second side wall portion 50, the side wall panel 51, in which the support pieces 38a, 38b are folded inward relative to the side wall panel 51 (see FIG. 21), is folded inward according to the folding structure of the second end portion 14. As a result, the punched panel 110 and the wall pieces 123, 124 of the side wall portion 130 are formed. Also, the support portions 137a, 137b, 138a, 138b protrude toward the fixed side beyond the punched panel 110 and come into contact with the punched panel 110 and the support portions 135a, 135b, 136a, 136b. This prevents the wall pieces 121 and 122 from falling inward.

[0141] Next, the membrane member sheet 4 for forming the membrane member 105 of the sound absorbing structure 103 will be described. FIG. 22 is a plan view of the membrane member sheet 4. As shown in FIG. 22, the membrane member sheet 4 is a sheet having the shape of the membrane member 105 when unfolded, and is made of a material for forming the membrane member 105, such as paper, soft resin film, or rubber. As shown in FIG. 22, in the membrane member sheet 4, edge pieces 108a, 108b, 108c, and 108d forming the edge portion 108 are connected flush with the membrane portion 107. In the membrane member sheet 4, the ends 107c, 107d, 107e, and 107f of the membrane member 107 may have a folded structure. Furthermore, when the edge portion 108 of the membrane member 105 is connected in a ring shape, a connecting margin for connection may be provided at any of the ends of the edge pieces 108a, 108b, 108c, and 108d. In this case, the edge pieces 108a, 108b, 108c, and 108d can be connected by, for example, an adhesive, etc. In the membrane member sheet 4, the membrane member 105 is formed by folding the edge pieces 108a, 108b, 108c, and 108d relative to the membrane portion 107.

[0142] Next, the frame member sheet 5 for forming the frame member 106 of the sound absorbing structure 103 will be described. FIG. 23 is a plan view of the frame member sheet 5. As shown in FIG. 23, the frame member sheet 5 is a sheet having the shape of the unfolded frame member 106, and is formed, for example, from the same sheet material as the sound absorbing structure sheets 1 to 3. As shown in FIG. 23, the frame member sheet 4 has frame member pieces 106a, 106b, 106c, and 106d connected flush with each other. In the frame member sheet 5, the boundaries between the frame member pieces 106a, 106b, 106c, and 106d may have a fold structure. The frame member sheet 5 may also be provided with a connecting portion for connecting the frame member pieces 108a, 108b, 108c, and 108d in a ring shape. In this case, the edge pieces 108a, 108b, 108c, and 108d can be connected, for example, with an adhesive or the like. In the frame member sheet 5, each portion is folded to form frame member pieces 106a, 106b, 106c, and 106d, and the frame member pieces 106a, 106b, 106c, and 106d are connected in a ring shape to form the frame member 106. The frame member sheet 5 may be a sheet having a shape in which a modified example of the frame member 106 (see FIG. 11) is developed. In this case, the modified example of the frame member 106 (see FIG. 11) is formed from the frame member sheet 5.

[0143] As described above, the sound absorbing structural members 104, 109 can be formed by folding the sheet-like sound absorbing structural sheets 2, 3. Therefore, the sound absorbing structural members 104, 109 can be stored in the form of the sheet-like sound absorbing structural sheets 2, 3. This allows the sound absorbing structural members 104, 109 to reduce the space required for storage.

[0144] As described above, the sound absorbing structural members 104 and 109 according to the second embodiment of the present invention and the sound absorbing structural sheets 2 and 3 according to the second embodiment of the present invention can be prevented from becoming bulky during storage.

[0145] Furthermore, a sound-absorbing structure sheet set can be made by combining the sheets 2 and 3 with the membrane member sheet 4 and frame member sheet 5. The sound-absorbing structure sheet set can also be prevented from becoming bulky during storage.

[0146] Although the present invention has been described above through the above embodiments, 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 and improvements can be made to the above embodiments. It is clear from the claims that such modifications and improvements can also be included within the technical scope of the present invention.

[0147] The above-described embodiments are intended to facilitate understanding of the present invention and are not intended to limit the scope of the present invention. Furthermore, the above-described embodiments do not limit the scope of the present invention, and the present invention may include any and all applications. The components of the above-described embodiments, as well as their arrangement, materials, conditions, shape, size, etc., are not limited to those illustrated and may be modified as appropriate. For example, the present invention includes differences that arise during implementation due to manufacturing tolerances, etc. Furthermore, components illustrated in different embodiments may be partially substituted or combined within the scope of technical inconsistency. Furthermore, the various configurations may be selectively combined as appropriate to achieve at least some of the above-described problems and effects.

[0148] For example, the term "foldable" includes a configuration that makes folding easy. For example, a configuration that makes folding easy by using a crease structure, as in the above-described embodiment, is also included in the "foldable" configuration. Furthermore, a configuration that makes it possible to fold in a specific direction may also include a configuration that makes it possible to fold in other directions, for example, in the direction opposite to the specific direction. [Explanation of symbols]

[0149] 1, 2, 3 sound absorbing structure sheet, 1a surface, 1b back surface, 4 membrane member sheet, 5 frame member sheet, 10 punched panel portion, 11, 12 first end portion, 13, 14 second end portion, 15a, 15b support piece, 16a, 16b end portion, 20, 30 first side wall portion, 21, 31 side wall panel, 21a, 21b, 21c, 31a, 31b, 31c end portion, 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 portion, 24c, 24d, 34c, 34d recess portion, 24e, 24f, 34e, 34f protrusion portion, 25, 26, 35, 36 End panel, 27a, 27b, 27c, 27d, 37a, 37b, 37c, 37d; folding structure, 28, 38a, 38b; support piece, 28a; end, 29a, 29b; convex portion, 38aa, 38ab, 38ba, 38bb; end, 40, 50; second side wall portion, 41, 51; side wall panel, 41a, 41b, 41c, 51a, 51b, 51c; 42, 52; end, first interior wall panel, 43, 53; exterior wall panel, 43a, 43b, 53a, 53b; end, 44, 54; second interior wall panel, 44a, 44b, 54a, 54b; end, 44c, 44d, 54c, 54d; slit, 45, 46, 55, 56 End panel, 47a, 47b, 47c, 47d, 57a, 57b, 57c, 57d Fold structure, 48 Fixing portion, 48a First fixing portion, 48aa Main body portion, 48ab, 48ac Claw portion, 48b Second fixing portion, 48ba Recess, 100, 103 Sound absorbing structure, 101, 104, 109 Sound absorbing structural member, 102, 105 Membrane member, 102a, 102b Surface, 106 Frame member, 106a, 106b, 106c, 106d Frame member piece, 106e, 106f, 106aa, 106ba, 106ca, 106da End, 106g, 106h, 106i, 106j Fixing piece, 107 Membrane portion, 107a, 107b Face, 107c,107d,107e,107f Edge, 108 Edge, 108a,108b,108c,108d Edge piece, 108aa,108ab,108ac,108ba,108bb,108bc,108ca,108cb,108cc,108da,108db,108dc Edge, 110 Punching panel, 110a,110b,110c,110d Edge, 111 Through hole, 112,113 Surface, 120,130 Side wall, 120a,End 120b, wall plates 121, 122, 123, 124, ends 121a, 121b, 121c, 121d, 122a, 122b, 122c, 122d, 123a, 123b, 123c, 123d, 124a, 124b, 124c, 124d, fixing parts 125a, 125b, 126a, 126b, 131a, 131b, 132a, 132b, 133a, 133b, 134a, 134b, 135a, 135b, 136a, 136b, 137a, 137b, 138a, 138b Support section, 131aa, 131ba, 132aa, 132ba, 133aa, 133ba, 134aa, 134ba terminals, h11, h12, h13, h21, h22, h23, h31, h32, h33, h34 frames, S, S1, S2 spaces.

Claims

1. A sound-absorbing structure sheet that can be assembled to a sound-absorbing structure, It is formed from a bendable sheet, a punched panel portion forming a punched panel having a plurality of through holes; a pair of first side wall portions forming a pair of first side walls facing each other; a pair of second side wall portions forming a pair of second side walls facing each other, The punching panel portion has a first end portion which is a pair of end portions opposed to each other, and a second end portion which is a pair of end portions opposed to each other and extends in a direction intersecting the first end portion, the pair of first side wall portions are foldably connected to the pair of first end portions of the punching panel portion, respectively; the pair of second side wall portions are foldably connected to the pair of second end portions of the punching panel portion, respectively; the pair of first side wall portions are each bendable in a direction in which the punching panel faces so that the punching panel is positioned between a pair of ends of the first side wall portions, The pair of second side wall portions are each bendable in a direction in which the punching panel faces so that the punching panel is positioned between a pair of ends of the second side wall portions. Sound-absorbing structural sheet.

2. the first sidewall portion has a plurality of sidewall panels extending along the first edge; the second side wall portion has a plurality of side wall panels extending along the second end; In the first side wall portion, the plurality of side wall panels are foldably connected in an extension direction from the first end portion of the first side wall portion, In the second side wall portion, the plurality of side wall panels are foldably connected in an extension direction from the second end portion of the second side wall portion. The sound-absorbing structure sheet according to claim 1 .

3. The plurality of side wall panels of the first side wall portion include a first inner wall panel that can be bent in one direction in which the punching panel portion faces, and an outer wall panel that can be bent in the other direction in which the punching panel portion faces relative to the first inner wall panel, The plurality of side wall panels of the second side wall portion include a first inner wall panel that can be bent in one direction in which the punched panel portion faces, and an outer wall panel that can be bent in the other direction in which the punched panel portion faces relative to the first inner wall panel, In the first side wall portion, the width of the outer wall panel in the extension direction is wider than the width of the first inner wall panel in the extension direction, In the second side wall portion, a width of the outer wall panel in the extension direction is wider than a width of the first inner wall panel in the extension direction. The sound-absorbing structure sheet according to claim 2 .

4. The plurality of side wall panels of the first side wall portion include a second inner wall panel that can be bent in the other direction of the punching panel portion relative to the outer wall panel, The plurality of side wall panels of the second side wall portion include a second inner wall panel that can be bent in the other direction of the punching panel portion relative to the outer wall panel, The sound-absorbing structure sheet according to claim 3 .

5. the second side wall portion has a fixing portion that fixes the second side wall portion to the first side wall portion, the fixing portion is configured to fix the second side wall portion to the first side wall portion such that a pair of ends of the second side wall portion in an extension direction along the second end portion face adjacent ones of a pair of ends of the first side wall in an extension direction along the first end portion, The sound-absorbing structure sheet according to claim 1 .

6. The foldable sheet is a cardboard sheet. The sound-absorbing structure sheet according to claim 1 .

7. A sound-absorbing structure sheet set that can be assembled into a sound-absorbing structure, a sound-absorbing structure sheet formed of a foldable sheet; a membrane member forming a flexible membrane, The sound-absorbing structure sheet is a punched panel portion forming a punched panel having a plurality of through holes; a pair of first side wall portions forming a pair of first side walls facing each other; a pair of second side wall portions forming a pair of second side walls facing each other; and The punching panel portion has a first end portion which is a pair of end portions opposed to each other, and a second end portion which is a pair of end portions opposed to each other and extends in a direction intersecting the first end portion, the pair of first side wall portions are foldably connected to the pair of first end portions of the punching panel portion, respectively; the pair of second side wall portions are foldably connected to the pair of second end portions of the punching panel portion, respectively; The pair of first side wall portions are each bendable so as to protrude from the punching panel in one direction toward which the punching panel faces, The pair of second side wall portions are each bendable so as to protrude from the punching panel in one direction toward which the punching panel faces, The membrane member faces the punched panel on one side of the facing direction of the punched panel, and forms the space between the membrane member and the punched panel. Sound-absorbing structural sheet set.

8. Further provided is a frame member sheet formed from the foldable sheet, The frame member sheet is folded and adhered to form an annular frame member that can fix the membrane member to the first side wall and the second side wall. The sound-absorbing structure sheet set according to claim 7.

9. the membrane member surrounds the first side wall and the second side wall from an outer periphery side, the frame member surrounds the first side wall and the second side wall from the outer periphery side via the membrane member that surrounds the first side wall and the second side wall from the outer periphery side. The sound-absorbing structure sheet set according to claim 8.

10. The frame member protrudes from the first side wall and the second side wall in a direction facing the punching panel, The protruding portion is bendable toward the outer periphery. The sound-absorbing structure sheet set according to claim 8.

11. the pair of first side wall portions are each bendable in a direction in which the punching panel faces so that the punching panel is positioned between a pair of ends of the first side wall portions, The pair of second side wall portions are each bendable in a direction in which the punching panel faces so that the punching panel is positioned between a pair of ends of the second side wall portions. The sheet set for a sound-absorbing structure according to claim 7.

12. the first sidewall portion has a plurality of sidewall panels extending along the first edge; the second side wall portion has a plurality of side wall panels extending along the second end; In the first side wall portion, the plurality of side wall panels are foldably connected in an extension direction from the first end portion of the first side wall portion, In the second side wall portion, the plurality of side wall panels are foldably connected in an extension direction from the second end portion of the second side wall portion. The sound-absorbing structure sheet set according to claim 11.

13. The plurality of side wall panels of the first side wall portion include a first inner wall panel that can be bent in the other direction of the facing direction of the punching panel portion, and an outer wall panel that can be bent in one direction of the facing direction of the punching panel portion relative to the first inner wall panel, The plurality of side wall panels of the second side wall portion include a first inner wall panel that can be bent in the other direction of the facing direction of the punching panel portion, and an outer wall panel that can be bent in one direction of the facing direction of the punching panel portion relative to the first inner wall panel, In the first side wall portion, the width of the outer wall panel in the extension direction is wider than the width of the first inner wall panel in the extension direction, In the second side wall portion, a width of the outer wall panel in the extension direction is wider than a width of the first inner wall panel in the extension direction. The sound-absorbing structure sheet set according to claim 12.

14. The plurality of side wall panels of the first side wall portion include a second inner wall panel that can be bent in one direction toward the punching panel portion relative to the outer wall panel, The plurality of side wall panels of the second side wall portion include a second inner wall panel that can be bent in one direction toward the punching panel portion relative to the outer wall panel, The sound-absorbing structure sheet set according to claim 13.

15. the second side wall portion has a fixing portion that fixes the second side wall portion to the first side wall portion, the fixing portion is configured to fix the second side wall portion to the first side wall portion such that a pair of ends of the second side wall in an extension direction along the second end portion each face an adjacent one of a pair of ends of the first side wall in an extension direction along the first end portion. The sound-absorbing structure sheet set according to claim 7.

16. a first support portion that supports the first side wall relative to the punching panel; a second support portion that supports the second side wall relative to the punching panel, the first support portion extends from the first side wall portion in a bendable manner, The second support portion extends foldably from the second side wall portion. The sound-absorbing structure sheet set according to claim 7.

17. the first support portion is connected to a pair of ends of the first side wall portion in an extension direction along the first end portion, and the first support portion is bent relative to the first side wall portion in the first side wall portion bent relative to the punching panel portion so as to contact the punching panel portion at one of the ends in the direction facing the punching panel portion, The second support portions are connected to a pair of ends in an extension direction along the second end portion of the second side wall portion, and the two support portions are bent relative to the second side wall portion at the second side wall portion bent relative to the punching panel portion, so that one of the ends in the direction facing the punching panel portion comes into contact with the punching panel portion. The sound-absorbing structure sheet set according to claim 16.

18. The foldable sheet is a cardboard sheet. The sound-absorbing structure sheet set according to claim 7.

19. a sound-absorbing structural member formed of a bendable sheet; a membrane member forming a flexible membrane, The sound-absorbing structural member includes a punched panel having a plurality of through holes and an annular side wall surrounding the punched panel from an outer periphery thereof, The punching panel is formed by folding the sheet, the side walls are formed by folding the sheet, The side wall protrudes from the punching panel in one direction toward which the punching panel faces, The film portion faces the punching panel on one side of the punching panel, forming a space between the film portion and the punching panel. Sound absorbing structure.

20. The frame member is an annular member formed from a foldable sheet, The frame member fixes the membrane member to the side wall.

20. A sound absorbing structure according to claim 19.

21. an outer peripheral end of the membrane member surrounds the side wall from the outer peripheral side; the frame member surrounds the side wall from the outer periphery via the membrane member that surrounds the side wall from the outer periphery, 21. A sound absorbing structure according to claim 20.

22. The frame member protrudes from the side wall in a direction facing the punching panel, The protruding portion of the frame member is bendable toward the outer periphery.

20. A sound absorbing structure according to claim 19.

23. The punching panel is located between a pair of ends of the side wall in a direction facing the punching panel.

20. A sound absorbing structure according to claim 19.

24. The foldable sheet is a cardboard sheet.

20. A sound absorbing structure according to claim 19.

Images