Acoustic interference prevention device etc.

Abstract

To provide a device for acoustic hazard prevention and the like, that can be easily manufactured, is less susceptible to damage, and has a higher degree of freedom in terms of installation.SOLUTION: A plurality of ribs 3 for acoustic diffusion with a plurality of points P aligned on a surface and connected by line segments L are provided. The ribs are acoustically exposed on the sound incident side Sa, and the plurality of points P are arranged according to the following equation. The angle between an n-th line segment connecting an n-th point and a reference point, and an n+1-st line segment connecting the n+1-st point and the reference point is nα (n is a natural number), and an n range satisfies n+1-st line segment length R(n+1)>n-th line segment length R(n). φ=(1+sqrt(5)) / 2α=360°*1 / (1+φ)SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an acoustic failure prevention device for preventing acoustic failures or improving sound quality (hereinafter referred to as "acoustic failure prevention, etc."). More specifically, the present invention relates to an acoustic failure prevention device having ribs for an acoustic diffuser disposed in a space or the like.

Background Art

[0002] For example, in concert halls, music studios, etc., it is necessary to prevent acoustic failures such as flutter echo, long-pass echo, and acoustic concentration. Also, for example, sound quality may be improved according to music genres or musicians' preferences. To prevent these acoustic failures or improve sound quality, an acoustic failure prevention device described in Patent Document 1 has been proposed as a method for individually adjusting prevention of multiple reflections, diffusion of sound, etc.

[0003] According to the same document, a plurality of three-dimensional polyhedrons (units) for acoustic diffusion that are substantially similar or congruent to each other are arranged close to each other with different orientations, and these polyhedrons are joined to each other and / or joined via a connecting body to form an acoustic diffuser. However, according to this configuration, since each polyhedron three-dimensionally forms unevenness with different orientations from each other, it is necessary to consider that the unevenness does not come into contact with the human body or utensils and is damaged, and there are limitations in installation. Also, the intricate unevenness of the polyhedron needs to be precisely manufactured with a 3D printer or the like, and there are manufacturing constraints.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In view of such a conventional situation, an object of the present invention is to provide a sound interference prevention device or the like that can be easily manufactured, is less likely to be damaged than conventional ones, and has a high degree of freedom in installation.

Means for Solving the Problems

[0006] To achieve the above object, the sound interference prevention device or the like according to the present invention is characterized in that a plate-like unit body provided with a plurality of transmission portions penetrating through the front and back of the plate-like body is provided. This plate-like unit body has a frame body and a plurality of ribs for sound diffusion supported by the frame body, and the transmission portions are provided between the plurality of ribs or between the rib and the frame body. The rib includes a first line segment that sequentially connects a plurality of points arranged on the surface from the center side of the reference point to the outside, and a second line segment different from the first line segment that sequentially connects the plurality of points from the center side of the reference point to the outside. At each point, the first line segment and the second line segment intersect to form a mesh. These ribs are acoustically exposed on the sound incident side, and the plurality of points are arranged according to the following formula, for the purpose of preventing sound interference or improving sound quality. The angle between the nth line segment connecting the nth point and the reference point and the (n + 1)th line segment connecting the (n + 1)th point and the reference point is nα (n is a natural number), and there is an n range that satisfies (n + 1)th line segment length R(n + 1)>nth line segment length R(n). φ=(1+sqrt(5)) / 2 α=360°*1 / (1+φ)

[0007] According to the same configuration, since there is an n range that satisfies (n + 1)th line segment length R(n + 1)>nth line segment length R(n), points can be formed without overlapping. And the angle between the nth line segment connecting the nth point and the reference point and the (n + 1)th line segment connecting the (n + 1)th point and the reference point is nα (n is a natural number), and it appears according to the so-called golden angle relationship. Since the incident sound is reflected and diffused by the ribs connecting each point P having the element of the golden angle in these mutual angles, the reflection and diffusion proceed very smoothly, and sound interference and the like are efficiently eliminated. Moreover, since it is only necessary to form the ribs of the plate-like body, the production can be carried out extremely simply, and since the shape is planar and has few irregularities, it is less likely to be damaged.

[0008] In the above configuration, it is preferable that the plate-shaped unit body is defined such that R(n + 1) / R(n) is an arbitrary magnification or nφ times (n is a natural number).

[0009] Further, the first line segment and the second line segment may connect the plurality of points in a spiral shape. Each point is regularly connected by a spiral rib, resulting in excellent performance not only in terms of strength but also in terms of design.

[0011] A plurality of the plate-shaped unit bodies may be provided, and the plurality of plate-shaped unit bodies may be stacked around the reference point at different angles or with the front and back reversed. With these modifications, the diffusion of sound and the like will be further improved.

[0012] Further, the plate-shaped unit bodies may be separated from each other. The diffusion of sound reaches the plurality of plate-shaped unit bodies, improving the preventive effect against acoustic obstacles and the like. Specifically, spacers may be provided between the plate-shaped unit bodies to separate them from each other.

[0013] By interposing a sound-absorbing material between the plate-shaped unit bodies, the diffused sound can be efficiently attenuated.

[0014] A plurality of the plate-shaped unit bodies may be provided, and a plurality of the plate-shaped unit bodies may be arranged side by side on the same plane, or a plurality of the plate-shaped unit bodies may be arranged such that the surfaces of the plate-shaped unit bodies form an angle. Further, the plurality of plate-shaped unit bodies may have different sizes with respect to the direction of the spread of the surface.

[0015] By providing a breathable light-shielding material on one surface of the plate-shaped unit body, the design can be improved and it can also be used as a floor material.

[0016] The plate-shaped unit body may have a rib intersection portion larger than other rib portions at the positions of the respective points.

[0017] Furthermore, it may have a microphone, and the plate-shaped unit body may be arranged on the side opposite to the sound source side of the microphone.

[0018] In terms of the structure, it is advisable to combine different materials on the front and back sides of each plate-shaped unit body.

[0020] Furthermore, it may have a sound source, and the plate-shaped unit body may be provided on the upper surface of a base where the sound source is installed above.

[0021] A plurality of the plate-shaped unit bodies may be connected to each other at their side edges so that the angle can be freely changed.

Advantages of the Invention

[0024] According to the features of the acoustic interference prevention device and the like according to the present invention, it is possible to provide an acoustic interference prevention device and the like that can be easily manufactured, are less likely to be damaged than conventional ones, and have a high degree of freedom in installation.

[0025] Other objects, structures, and effects of the present invention will become apparent from the following sections on the embodiments of the invention.

Brief Description of the Drawings

[0026]

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Embodiments for Carrying Out the Invention

[0027] Next, the present invention will be described in more detail with reference to the accompanying drawings as appropriate. FIGS. 1 and 2 are front side views of the plate-like unit body 1 constituting the acoustic interference prevention device 100 according to the present invention (for expressing a three-dimensional object, it is shown in a different notation from a front view). As will be described later, a plurality of points P are arranged on the plane PL, and the rib 3 is formed at the position of the line segment L connecting each point. The periphery of the rib 3 is surrounded by a rectangular frame 5, and a transmission portion 7 is formed between the frame 5 and the rib 3 and between the ribs 3.

[0028] As shown in FIG. 2, the cross-section of each rib 3 has a rectangular shape with a front surface 3a, a side surface 3b, and a back surface 3c, and scatters and reflects the sound entering from the incident side Sa, or transmits it to the back surface side Sb and scatters it in different directions. The plane PL is the XY plane in this example, and a plurality of points P are arranged on this plane PL. After the configuration, the surface may be made into a curved surface, including a curved surface and a flat surface.

[0029] As shown in FIG. 3, the cross-section of each rib 3 can be formed into a rectangle as indicated by reference numeral 3A, or can be formed into a semi-circle as indicated by reference numeral 3B, a circle as indicated by reference numeral 3C, a triangle as indicated by reference numeral 3D, and can take various cross-sectional shapes as long as it has the above-described transmission portion 7. Each plate-like unit body can be produced by punching out a plate material with a blade, cutting it out with a router or a laser, or using a 3D printer according to the cross-sectional shape of the rib 3. A fluid material may be injected into a mold and solidified. Also, the front and back surfaces may be formed of different materials respectively and bonded together after production. After the regeneration of the flat surface, it is also possible to bend the surface into a curved surface. As the production material, wood, synthetic resins such as acrylic and ABS, metal, ceramic, concrete, cement, mortar, plaster, glass, rubber, etc. can be used.

[0030] Here, while comparing FIGS. 4a and 4b, the effect of the spacer will be examined. FIG. 4a is a conceptual cross-sectional view showing the case where no spacer is provided between a plurality of plate-like units constituting a device for preventing acoustic interference or the like. When the plate-like units 1a to 1c and the plate-like units 1d to 1f are overlapped with each other without a gap, the incident sound S1 passes through the transmission portion 7 and is reflected by the frame 5, the wall 200, etc., and is radiated to the outside as the reflected sound S2 only within the range of the frame 5. On the other hand, when a spacer 10 is provided between the plurality of plate-like units 1a, 1b, 1c, 1d constituting the device for preventing acoustic interference or the like as shown in FIG. 4b, it is reflected within the adjacent unit beyond the frame 5 and is radiated to the outside as the reflected sound S2. Therefore, providing the spacer 10 enables diffusion and the like to be performed using a large number of ribs.

[0031] Next, with reference to FIGS. 5a to 5g, the design procedure of the rib 3 and the frame 5 will be described. The following is an example, and ribs may be formed in various ways such as spiral and radial. A reference point (origin) O is set, and an arbitrary branch intersection point P is first created at a position other than the reference point, which becomes the first point. Here, each value is defined as follows. Golden ratio φ = (1 + sqrt(5)) / 2 Golden angle α = 360° * 1 / (1 + φ)

[0032] And the relationship between the nth point P(n) and the (n + 1)th point P(n + 1) is shown in FIG. 5b. The distance R from the reference point is φ times the distance at the previous point, and the rotation is increased by α. As an application, integer multiples such as φ being nφ and α being nα may be used. Also, when approaching the outer circumference, the distance R from the reference point may be set to be the same as the distance at the previous point, and the rotation may be increased by nα. That is, it suffices to have an n range that satisfies the (n + 1)th line segment length R(n + 1) > the nth line segment length R(n).

[0033] Next, as shown in FIG. 5c, each point P is connected by a first line segment (rib) La as a left-handed helix. Next, as shown in FIG. 5d, each point is connected by a second line segment (rib) Lb to a helix in the direction opposite to the previous helix direction. Further, as shown in FIG. 5e, in the vicinity of the reference point O, it may be difficult to follow the helix rule, and it is advisable to sequentially connect adjacent ones with a third line segment (rib) Lc.

[0034] After forming the ribs as described above, as shown in FIG. 5f, the ribs are partitioned by the frame 5 to determine the ribs. Here, the first line segment (rib) La and the second line segment (rib) Lb are each partitioned by the frame 5. The frame may be partitioned in any various shapes in addition to the star-shaped frame 5a as shown in FIG. 5g.

[0035] By the way, in the above embodiment, at the branch intersection point P, there is only a rib and no other shapes, but as shown in FIG. 6, a larger enlarged portion than the rib 3 may be formed at the branch intersection 9. Also in this case, it is important that the shape of the branch intersection 9 does not prevent the incidence of sound to the rib 3 by expanding in the direction along the plane PL. The enlarged branch intersection 9 can be provided in various shapes such as a circle, a square, or a polygon, and these may be angularly displaced by an integer multiple of the golden angle α.

[0036] Examples of configuring an acoustic frost damage prevention device by combining a plurality of plate-like units will be listed from FIG. 7 onwards.

[0037] FIG. 7a shows an example in which plate-like units of different sizes are arranged in the plane direction. The assembly 11 is configured by arranging two small plate-like units 11a and one large plate-like unit 11b in the plane PL direction to form an acoustic obstacle prevention device 100. Each plate-like unit 11a, 11b may be rotated so as to have different angular positions around the previous central axis and then combined, and the same applies hereinafter.

[0038] FIG. 7b shows an example in which plate-shaped units with different numbers of stacked sheets are arranged in the plane direction. Among the plate-shaped units 13a, 13b, and 13c arranged at five positions in the PL direction of the surface of the assembly 13, only one plate-shaped unit 13a is provided at the upper right and lower left positions, two plate-shaped units 13a and 13b are stacked at the upper left and lower right positions, and three plate-shaped units 13a, 13b, and 13c are stacked at the central position. The stacked portions are each formed by stacking the same plate-shaped unit with its orientation changed by 90 degrees each time.

[0039] FIG. 7c shows an example in which plate-shaped units are arranged and stacked in the plane direction. The assembly 15 is formed by arranging nine plate-shaped units 15a in the plane direction, arranging four plate-shaped units 15b on top of them, and further stacking a plate-shaped unit 15c at a 45-degree inclination on the uppermost layer.

[0040] FIG. 7d shows an example in which plate-shaped units are combined in a square shape and further combined three-dimensionally. The assembly 16 is formed by further combining four square bodies 17A to 17D, each formed by combining a plurality of plate-shaped units 17 in a square shape.

[0041] FIG. 8 shows an example in which plate-shaped units are combined on a screen, and (a) shows the folded state and (b) shows the unfolded state. The screen body 19 is formed by combining three plate-shaped units 19a, 19b, and 19c with hinges provided on their side edges so that the angle can be freely changed.

[0042] FIG. 9a shows an example in which plate-shaped units are incorporated into a partition. The partition booth 20 is formed by attaching a plurality of plate-shaped units 21 onto the front partition 201a of the partition 201 and the horizontal partition 201b fixed orthogonally thereto, and a table 203 is provided. There is an advantage that leakage of conversations and the like within each booth can be prevented, and moreover, problems related to air conditioning and fire protection are less likely to occur. The plurality of plate-shaped units 21 may be suspended from the ceiling or the like without being fixed onto the partition 201.

[0043] Figure 9b shows an example of incorporating a plate-shaped unit into the wall surface of a building. The assembly 22 is a combination of the plate-shaped unit 23 and the small wall 205 in a staggered pattern, and further combined with the large wall 206. On the combination of the plate-shaped unit 23 and the small wall 205 in a staggered pattern, a masking material such as a breathable cloth may be provided, for example.

[0044] Figure 10 shows an example of combining a plate-shaped unit and a sound-absorbing material. The laminate 24 is formed by overlapping the plate-shaped unit 25 with a frame 207 incorporating the sound-absorbing material 208.

[0045] Figure 11 shows an example of incorporating a plate-shaped unit into an upper-mounted unit for a partition. The upper-mounted unit 27 is provided with a pair of side plates 211 at the lower part of a plurality of spaced-apart plate-shaped units 27a, 27b, and the two are connected by a lower plate 213 and a cross plate 215. In the cavity between the plate-shaped units 27a, 27b, the previous sound-absorbing material may be housed for reducing sound pressure. In use, the upper part of the partition may be fitted and fixed between the pair of side plates 211.

[0046] It is a perspective view of a sound barrier prevention device showing an example of constructing a floor material by overlapping plate-shaped units. The unit floor material 29 is formed by separating the plate-shaped units 29a, 29b and the mesh plate 29c which is a masking material with spacers 29d respectively. The spacers 29d may be made of a hard material, or may be composed of an elastic body such as rubber or synthetic resin.

[0047] Figure 13 shows an example of overlapping a wall material on a plate-shaped unit. A wall material 219 is provided on the back surface of the plate-shaped unit 31. For example, when using plaster, it is expected to improve the design and impart a change to scattering, and also improve the hygroscopicity. Concrete, cement, mortar, etc. may be used instead of plaster.

[0048] FIG. 14 shows an example in which a plate-shaped unit body is provided to be openable and closable in a window. In this example, a pair of plate-shaped unit bodies 33a and 33b are attached by hinges to the hinge sides 33c on the side edges of two window frames 221 so as to be openable and closable. In addition to windows, it may be provided on a door. Since there is a high possibility of acoustic interference when there are facing surfaces in windows or doors, there is an advantage in providing an acoustic interference prevention device 100. It is also less likely to interfere with lighting, ventilation, etc.

[0049] FIG. 15 shows an example in which two plate-shaped unit bodies are combined and assembled into a rod-shaped body. The shield 34 is a combination of... The front material 35A and the back material 35B are each formed by connecting the centers of two plate-shaped unit bodies 35 with a connecting plate 225 and separating them with a spacer 35a and then combining them. A mounting belt 227 is passed through a through cut 226 and connected on the front and back, and by tightening the mounting belt 227, it is fixed at an arbitrary position on the rod-shaped body 231.

[0050] FIG. 16 shows an example in which plate-shaped unit bodies are combined in the plane direction to form a music stand. The music stand 37 is formed by attaching small plate-shaped unit bodies 37a at four locations around a large plate-shaped unit body 37b, and is provided with a music sheet receiver 233 and a support column 235.

[0051] On the other hand, FIG. 17 shows an example in which plate-shaped unit bodies are combined in the plane direction and stacked to form another music stand. The music stand attachment 38 is provided at each of the four corners of four plate-shaped unit bodies 39, a front plate 241, and a rear plate 243. A notch 243a for preventing interference with the music stand is provided at the center of the rear plate 243, and it is fixed so as to sandwich a 245a back plate supported by a support column 245b of the music stand 245 from the front and back.

[0052] Figure 18 shows an example of a microphone for vocals, emcees, etc. where a plate-shaped unit is combined with a microphone stand. The microphone shield 41 separates a pair of plate-shaped units 41a and 41b with spacers 41c at the four corners and is fixed to the microphone stand 251a of the microphone 251 via an acoustic interference prevention device holder 255. It is in the opposite direction to the windshield 253 attached in front of the microphone with the shield holder 253a. Note that for this type of shield, both sides can be the sound incident side Sa, and the same applies to the above partition and other shields below.

[0053] Figure 19 shows an example where a plate-shaped unit is combined with a speaker stand. The speaker stand 43 is formed by supporting plate-shaped units 43a and 43b that are inclined with respect to each other with a pair of front legs 43c and a pair of rear legs 43d. A speaker 257 is placed on the upper part. It can effectively achieve the prevention effect of acoustic interference in a narrow space.

[0054] Figure 20 shows an example where a plate-shaped unit is combined with a drum set stand. The drum stand 45 is a combination of four unit stands 45A - D, and a drum set 259 is placed on the upper part. Each unit stand 45A - D is formed by separating and fixing a plate-shaped unit 45a, 45b and a mesh plate 45c with spacers 45d at the four corners. For example, it is expected to prevent the sound of a piano from being transmitted to the floor and the vibration being transmitted to the drums, causing the cymbal to ring (solid-borne sound).

[0055] Figure 21 shows an example where a plate-shaped unit is used as a shield for a concert. The shield 47 is formed by overlapping plate-shaped units 47a and 47b on the front and back, and is placed between the players using the musical instruments 261a and 261b to protect the ears of the players sitting in front. By pasting a cloth that transmits sound, it is expected to suppress the scattering of virus droplets.

[0056] FIG. 22 shows an example in which a plate-shaped unit is used to prevent howling of a monitor speaker. The howling prevention body 49 is formed by combining plate-shaped units 49a and 49b on the front and back, and is arranged in front of the speaker surface 263a of the monitor speaker 263. For example, howling between the microphone 265 and the speaker 263 can be prevented.

[0057] FIG. 23 shows an example in which a truss is configured with plate-shaped units. The truss 51 is formed by combining a plurality of plate-shaped units 51a to 51f that bear different surfaces, and installation variations such as making their respective rotational directions different can be considered.

[0058] FIG. 24 shows an example in which a plate-shaped unit is used in a pool or the like. The plate-shaped unit 53 is made of, for example, a water-resistant material and is provided on the wall surface 271 of the pool 269. In a pool, the voices of coaches or instructors may be difficult to hear due to flutter echo or the like, and this type of situation is suitable for improvement. Since it does not scatter like glass wool, it is unlikely to cause inconvenience in installation.

[0059] FIG. 25 shows an example in which a plate-shaped unit is used in a remote workspace or the like. The plate-shaped unit 55 is provided on the wall surface 273a in the remote workspace 273. In the figure, a desk 275a, a chair 275b, and other office equipment are used. In such a narrow space, echo is likely to occur during a web conference, and it is also unlikely that the sound will be too quiet during normal times and cause a sense of discomfort when only sound-absorbing materials are used to cut the sound.

[0060] FIG. 26 is a perspective view of a Helmholtz resonator configured using a plate-shaped unit. By attaching a perforated plate 58 having a large number of through holes 58a to the entire surface of the plate-shaped unit 57, it is also possible to configure a Helmholtz resonator 59.

[0061] In addition, the above-described embodiments of the present invention can be implemented in combination with each other as long as their respective gists are not contrary to each other.

Industrial Applicability

[0062] The present invention can be used as a device for preventing acoustic disturbances, etc., in buildings, parts of rooms, parts of office furniture, individual shields, howling prevention machines, and the like.

Explanation of Signs

[0063] 1, 1a~1f: Plate-shaped unit body, 3: Rib, 3a: Surface, 3b: Side surface, 3c: Back surface, 5: Frame (rectangular frame), 5a: Star side frame, 7: Through portion, 9: Intersection portion, 10, 10a, 10b, 10c: Spacer, 11: Assembly, 11a, 11b: Plate-shaped unit body, 13: Assembly, 13a, 13b, 13c: Plate-shaped unit body, 15: Assembly, 15a, 15b, 15c: Plate-shaped unit body, 16: Assembly, 17: Plate-shaped unit body, 17A~D: Cuboid, 19: Screen body, 19a, 19b, 19c: Plate-shaped unit body, 20: Partition booth, 21: Plate-shaped unit body, 22: Assembly, 23: Plate-shaped unit body, 24: Laminate, 25: Plate-shaped unit body, 27: Upper unit, 27a, 27b: Plate-shaped unit body, 29: Unit floor material, 29a, 29b: Plate-shaped unit body, 29c: Mesh plate, 31: Plate-shaped unit body, 33a, 33b: Plate-shaped unit body, 33c: Hinge side, 34: Shield, 35: Plate-shaped unit body, 35a: Spacer, 35A: Surface material, 35B: Back material, 37: Music stand, 37a, 37b: Plate-shaped unit body, 38: Music stand attachment, 39: Plate-shaped unit body, 41: Microshield, 41a, 41b: Plate-shaped unit body, 41c: Spacer, 43: Speaker stand, 43a, 43b: Plate-shaped unit body, 43c: Front leg, 43d: Rear leg, 45: Drum stand, 45a, 45b: Plate-shaped unit body, 45c: Mesh plate, 45d: Spacer, 45A~D: Unit stand, 259: Drum set, 47: Shield, 47a, 47b: Plate-shaped unit body, 49: Howling prevention body, 49a,49b: Plate-shaped unit, 51: Truss, 51a - f: Plate-shaped units, 53: Plate-shaped unit, 55: Plate-shaped unit, 57: Plate-shaped unit, 58: Perforated plate, 58a: Through-hole, 59: Helmholtz resonator, 100: Apparatus for preventing acoustic interference etc., 200: Wall, 201: Partition, 201a: Front partition, 201b: Side partition, 203: Table, 205: Small wall, 206: Large wall, 207: Frame body, 208: Sound-absorbing material, 211: Side plate, Lower 213: Plate, 215: Cross plate, 219: Wall material, 221: Window frame, 225: Connecting plate, 226: Through cut, 227: Mounting belt, 231: Rod-shaped body, 233: Score receiver, 235: Support column, 241: Front plate, 243: Rear plate, 243a: Notch, 245: Score stand, Back plate: 245a, 245b: Support columns, 251: Microphone, 251a: Microphone stand, 253: Windshield, 253a: Shield holder, 255: Holder for apparatus for preventing acoustic interference etc., 257: Speaker, 261a, 261b: Musical instruments, 263: Monitor speaker, 263a: Speaker surface, 265: Microphone, 269: Pool, 271: Wall surface, 73: Remote workspace 2, 273a: Wall surface, 275a: Desk, 275b: Chair, PL: Plane, P: Point, L: Line segment, Sa: Incident side, Sb: Back side, La: First line segment (rib), Lb: Second line segment (rib), Lc: Third line segment (rib), P(n): nth point, O: Reference point, L(n): nth line segment, P(n): (n + 1)th point, L(n + 1): (n + 1)th line segment, α: Angle between line segments, R(n + 1): (n + 1)th line segment length, R(n): nth line segment length,

Claims

1. A plate-shaped unit body is provided with a plurality of through portions penetrating the front and back of the plate-shaped body, This plate-shaped unit body has a frame body and a plurality of ribs for sound diffusion supported by the frame body, and the through portions are provided between the plurality of ribs or between the ribs and the frame body, The ribs include a first line segment that sequentially connects a plurality of points arranged on the surface from the center side of the reference point to the outside, and a second line segment different from the first line segment that sequentially connects the plurality of points from the center side of the reference point to the outside. At each point, the first line segment and the second line segment intersect to form a mesh, These ribs are acoustically exposed on the sound incident side, and the plurality of points are arranged according to the following formula, for an acoustic interference prevention device or the like for preventing acoustic interference or improving sound quality. The angle between the nth line segment connecting the nth point and the reference point and the (n + 1)th line segment connecting the (n + 1)th point and the reference point is nα (n is a natural number), and there is an n range that satisfies (n + 1)th line segment length R(n + 1) > nth line segment length R(n). φ = (1 + sqrt(5)) / 2 α = 360° * 1 / (1 + φ)

2. The acoustic interference prevention device or the like according to claim 1, wherein the plate-shaped unit body is defined such that R(n + 1) / R(n) is an arbitrary magnification or nφ times (n is a natural number).

3. The acoustic interference prevention device or the like according to claim 1 or 2, wherein the first line segment and the second line segment connect the plurality of points in a spiral shape.

4. The acoustic interference prevention device or the like according to any one of claims 1 to 3, wherein a plurality of the plate-shaped unit bodies are provided and the plurality of plate-shaped unit bodies are stacked around the reference point at different angles or with the front and back reversed.

5. The acoustic interference prevention device or the like according to claim 4, wherein the spaces between the respective plate-shaped unit bodies are separated.

6. The acoustic interference prevention device or the like according to claim 5, wherein spacers are provided between the respective plate-shaped unit bodies to separate the spaces between the respective plate-shaped unit bodies.

7. The acoustic interference prevention device or the like according to claim 5 or 6, wherein a sound-absorbing material is interposed between the respective plate-shaped unit bodies.

8. The acoustic interference prevention device or the like according to any one of claims 1 to 7, wherein a plurality of the plate-shaped unit bodies are provided, and a plurality of the plate-shaped unit bodies are arranged side by side on the same plane or arranged such that the surfaces of the respective plate-shaped unit bodies form an angle.

9. The acoustic interference prevention device or the like according to claim 8, wherein the plurality of plate-shaped unit bodies have different sizes with respect to the direction of the spread of the surface.

10. The acoustic interference prevention device according to any one of claims 1 to 9, wherein a breathable light-shielding material is provided on one surface of the plate-like unit body.

11. The acoustic interference prevention device according to any one of claims 1 to 10, wherein the plate-like unit body has a rib intersection portion larger than other rib portions at the positions of the respective points.

12. The acoustic interference prevention device according to any one of claims 1 to 11, further comprising a microphone, wherein the plate-like unit body is arranged on the side opposite to the sound source side of the microphone.

13. The acoustic interference prevention device according to any one of claims 4 to 7, wherein each of the plate-like unit bodies is a combination of different materials on the front and back sides of the surface.

14. The acoustic interference prevention device according to any one of claims 1 to 11 and 13, further comprising a sound source, wherein the plate-like unit body is provided on the upper surface of a base on which the sound source is installed upward.

15. The acoustic interference prevention device according to any one of claims 1 to 11 and 13, wherein a plurality of the plate-like unit bodies are connected to each other at their side edges so that the angle can be freely changed.

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