Method for designing and manufacturing acoustic control panel

Abstract

To provide a design method and a production method for an acoustic adjustment panel allowing acoustic absorption and reflection performance to be adequately adjusted without producing various kinds of acoustic control panels.SOLUTION: A design method for an acoustic adjustment panel 1 configured to drill hole parts 5 in a flat plate 2 comprises a step of forming hole areas 3 with belt-like aligned holes in a predetermined pattern and forming belt-like non-hole areas 4 in the flat plate 2. A plurality of types of hole areas 3A, 3B, 3C having hole parts 5A, 5B, 5C with different diameters, respectively, are formed in the hole areas 3. The non-hole areas 4 with predetermined widths are formed between upper and lower end parts of the flat plate 2 and between the hole areas 3. Pitches of the hole parts 5A, 5B, 5C corresponding to each of the hole areas 3A, 3B, 3C, are formed with identical pitches thereof, respectively.SELECTED DRAWING: Figure 12

Description

[Technical field]

[0001] The present invention relates to a design method and a manufacturing method for an acoustic control panel that is installed on the ceiling or wall surfaces of a room in facilities such as a concert hall, a movie theater, a theater, a music lesson room, a broadcasting studio, an audiovisual room, etc., in order to enhance or improve the acoustic environment in the room. [Background technology]

[0002] Conventionally, in facilities such as concert halls, movie theaters, theaters, music lesson rooms, broadcasting studios, audiovisual rooms, and particularly in facilities where the acoustic environment within the room is important, efforts have been made to improve or enhance the acoustic environment within the room by appropriately adjusting the sound absorption, reflection, and diffusion characteristics of the ceiling, wall, and other surfaces in consideration of the volume level and frequency characteristics of the sound source generated within the room, and by appropriately preventing acoustic disturbances such as reverberation, flutter echo, and booming.

[0003] For example, a method has been proposed for adjusting the acoustic environment of a room 1 to an appropriate level by appropriately selecting and arranging high-frequency sound-absorbing panels 4 that absorb high-frequency sound, mid-frequency sound-absorbing panels 5 that absorb mid-frequency sound, and sound diffusion panels 6 and 7 that reflect and diffuse sound at various angles vertically and horizontally on the walls 3 of the room 1 (see Patent Document 1).

[0004] In addition, a method has been proposed in which a nonwoven fabric member 2 is filled into the space defined by opposing perforated board materials 1, 1 to form an acoustic adjustment panel material adjusted to absorb or reflect sound in a specified frequency band, and the acoustic adjustment panel material is appropriately positioned on the wall surfaces W of the room to adjust the interior of the room to an appropriate acoustic environment (see Patent Document 2). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 06-158750 [Patent Document 2] Utility Model Registration No. 3135263 Summary of the Invention [Problem to be solved by the invention]

[0006] In the method of Patent Document 1, the high-frequency sound-absorbing panel 4, the mid-frequency sound-absorbing panel 5 and the sound-diffusing panels 6 and 7 are constructed by stretching a nonwoven fabric 4c and a plate-like body 5b on their surfaces, and the sound absorption, reflection and diffusion performance can be changed by appropriately selecting the internal structure and the materials of the nonwoven fabric 4c and the plate-like body 5b, etc., but in order to do so, it is necessary to produce a large number of types of panels and it is difficult to subtly change these performances.

[0007] On the other hand, in the method of Patent Document 2, the sound absorption, reflection and diffusion performance of the acoustic control panel material can be changed by appropriately selecting the material of the filling nonwoven fabric member 2, the material of the perforated board material 1 and the diameter and pitch of the holes 11, etc. However, in order to do so, as with the method of Patent Document 1, it is necessary to produce a large number of different acoustic control panel materials, and it is difficult to subtly change these performances.

[0008] The present invention has been made in consideration of such conventional problems, and aims to provide a design method and manufacturing method for an acoustic control panel that can appropriately and subtly change the sound absorption, reflection and diffusion performance without having to produce a large number of types of acoustic control panels. [Means for solving the problem]

[0009] In order to achieve the above-mentioned object, the design method for an acoustic control panel of the present invention is a design method for an acoustic control panel constructed by drilling holes in a flat plate material, which is characterized in that a perforated area having a band-like arrangement of holes in a predetermined pattern is formed in the flat plate material, and a band-like non-perforated area is formed.

[0010] In addition, the perforated region may be formed with a plurality of types of perforated regions each having a different diameter of holes.

[0011] Furthermore, the number of perforated arrangements in each perforated region is appropriately set to one or more, and perforated regions of a predetermined width are formed at the upper and lower ends of the flat plate material and between each perforated region.

[0012] In consideration of the efficiency of production using a punching device, it is preferable to form corresponding holes in each of the perforated regions at the same longitudinal pitch.

[0013] In addition, in the manufacturing method for an acoustic control panel of the present invention, in a manufacturing method for an acoustic control panel constructed by drilling holes in a flat plate material, drills at appropriate positions attached at equal intervals in the perpendicular direction to the drilling device are detached and the diameter of the drills at appropriate positions is changed to a different one, and while transporting the flat plate material horizontally and lengthwise, the drills are intermittently moved up and down to form perforated and non-perforated areas in an appropriate pattern in the flat plate material.

[0014] It is also preferable that the length of the flat plate material be an integer multiple of a predetermined length unit, and that an acoustic control panel of a predetermined length be manufactured by cutting the flat plate material in an orthogonal direction at an appropriate position corresponding to the integer multiple of the length unit. Effect of the Invention

[0015] According to the design method of the acoustic control panel of the present invention, the sound absorption performance of the acoustic control panel can be varied in various ways by changing the material of the flat plate, the diameter and pitch of the holes, and further the pattern of the perforated and non-perforated areas.

[0016] It is then possible to produce an acoustic control panel in which the perforated and non-perforated areas have different performance characteristics and the sound absorption coefficient for sound frequencies is high over a wide frequency range.

[0017] In addition, according to the manufacturing method of the acoustic control panel of the present invention, the acoustic control panel can be manufactured in the same manner as in the conventional method without requiring a special manufacturing process, so that the manufacturing cost is not high. Furthermore, the waste of materials can be eliminated. [Brief description of the drawings]

[0018] [Figure 1] FIG. 1A is a front view of one embodiment of an acoustic control panel of the present invention, and FIG. [Diagram 2] 1 is an explanatory diagram showing the cross-sectional structure of a flat plate material made of plywood of an acoustic control panel. FIG. [Diagram 3] 2 is a cross-sectional view showing a state in which the acoustic control panel shown in FIG. 1 is installed on a wall surface. [Figure 4] 1 is a conceptual diagram illustrating a sound absorbing mechanism in an acoustic control panel. [Diagram 5] FIG. 1 is a conceptual diagram illustrating a sound absorbing mechanism in a Helmholtz resonator. [Figure 6] 1 is a graph showing the relationship between sound absorption coefficient and sound frequency in an acoustic control panel. [Figure 7] 1 is a graph showing the relationship between the center frequency of sound and the average sound absorption coefficient in a lesson room. [Figure 8] 1 is a graph showing the relationship between sound absorption coefficient and sound frequency in a conventional acoustic control panel. [Figure 9] FIG. 1 is a front view of a wall constructed using conventional acoustic control panels. [Figure 10] 4 is a graph showing the relationship between sound absorption coefficient and sound frequency in the acoustic control panel of the present invention. [Figure 11] FIG. 2 is a front view of a wall constructed using the acoustic control panel of the present invention. [Figure 12] 1 is a front view of an embodiment of an acoustic control panel manufactured by the design method of the present invention. [Figure 13] 13 is a table showing specifications of the acoustic control panel shown in FIG. 12. [Figure 14] 13 is a table showing calculated frequency characteristics of the sound absorption coefficient of the acoustic control panel shown in FIG. 12. [Figure 15] 13 is a table showing measurement results of frequency characteristics of sound absorption coefficient in the acoustic control panel shown in FIG. 12. [Figure 16]13 is a graph showing predicted and measured values ​​of the frequency characteristics of the sound absorption coefficient of the acoustic control panel shown in FIG. 12. [Figure 17] 1 is a front view of an embodiment of an acoustic control panel manufactured by the manufacturing method of the present invention. [Figure 18] 1 is an explanatory diagram showing a method for drilling holes in a conventional acoustic control panel using a drilling device. [Figure 19] 10 is an explanatory diagram showing a method of drilling holes in the acoustic control panel of the present invention using a drilling device. [Figure 20] FIG. 1A is a front view of one embodiment of a conventional acoustic control panel, and FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] The design method and manufacturing method of the acoustic control panel of the present invention will be described in detail below with reference to the drawings.

[0020] First, the acoustic control panel 1 designed by the design method of the present invention is, as shown in Figure 1, a rectangular flat plate material 2 of appropriate dimensions, on which perforated areas 3 having perforations arranged in a strip in a predetermined pattern are formed, and also a strip-shaped non-perforated area 4 is formed.

[0021] Here, the flat board material 2 can be a veneer made of natural wood such as larch, western cedar, Chinese linden, tamomasa, naramasa, or cherry, MDF (medium density fiberboard), or a plywood made by laminating these as shown in Figure 2. Furthermore, a single plate made of synthetic resin or metal, or a plywood made by laminating these may also be used.

[0022] In this embodiment, the dimensions of the flat plate material 2 were 9 mm thick, 600 mm high, and 900 mm, 1200 mm, 1500 mm, 1800 mm, 2100 mm, and 2400 mm long. However, it is not necessarily limited to this, and flat plate materials 2 of various dimensions can be used as necessary.

[0023] In this embodiment, the holes 5 formed in the longitudinally extending perforated array forming the perforated region 3 had apertures of 6 mm, 8 mm, and 9 mm and a longitudinal pitch of 20 mm. However, this is not necessarily limited to this, and holes 5 of various diameters and pitches can be formed as necessary.

[0024] Furthermore, in order to improve fire resistance, the surface of the flat plate material 2 may be coated with a non-flammable paint, a flame-retardant paint, or the like.

[0025] A conventional acoustic control panel 101 is, for example, an acoustic control panel 101A in which large-diameter holes 105A with an aperture of 9 mm are uniformly formed at a pitch of 25 mm over substantially the entire surface area of ​​a rectangular flat plate material 102 as shown in FIG. 20(A), or an acoustic control panel 101B in which small-diameter holes 105B with an aperture of 6 mm are uniformly formed at a pitch of 25 mm over the entire surface area of ​​a rectangular flat plate material 102 as shown in FIG. 20(B). That is, the conventional acoustic control panel 101 has holes 105 uniformly formed at a predetermined diameter and at a predetermined pitch over substantially the entire surface area of ​​the flat plate material 102 .

[0026] On the other hand, as shown in FIG. 1, the acoustic control panel 1 of the present invention is formed by dividing and forming band-shaped perforated areas 3A, 3B, 3C formed from a plurality of perforated arrangements in which large, medium and small holes 5A, 5B, 5C with diameters of 9 mm, 8 mm and 6 mm are drilled at a longitudinal pitch of 20 mm on the surface of a rectangular flat plate material 2, and a band-shaped non-perforated area 4 without any holes.

[0027] In other words, the acoustic control panel 1 of the present invention is an acoustic control panel constructed by drilling holes in a flat plate material, characterized in that a perforated area 3 having a band-like arrangement of holes in a predetermined pattern is formed in the flat plate material 2, and a band-like non-perforated area 4 is formed.

[0028] The perforated region 3 is composed of multiple types of perforated arrangements having different diameters of the holes 5, and is particularly characterized in that, in each of the multiple types of perforated arrangements, the holes 5 are formed at the same pitch in the longitudinal direction.

[0029] Specifically, the acoustic control panel 1A of one embodiment of the present invention employs a flat board material 2 which is a plywood made by laminating pieces of poplar wood 2A and cedar wood 2B, 2C, as shown in FIG. 2, and which is 9 mm thick, 600 mm high, and 1500 mm long.

[0030] As shown in Figure 1(A), on the surface of a rectangular flat plate material 2, perforated regions 3A1, 3A2 in which large-diameter 9 mm holes 5A are formed in a band-like shape with a longitudinal pitch of 20 mm, perforated regions 3B1, 3B2 in which medium-diameter 8 mm holes 5B are formed in a band-like shape with a longitudinal pitch of 20 mm, perforated regions 3C1, 3C2 in which small-diameter 6 mm holes 5C are formed in a band-like shape with a longitudinal pitch of 20 mm, and non-perforated regions 4A, 4B, 4C, 4D, 4E formed in a band-like shape are formed in a predetermined pattern.

[0031] As shown in FIG. 2, an acoustic control panel 1B according to another embodiment of the present invention is also, like the acoustic control panel 1A, a plywood made of laminated pieces of poplar wood 2A and cedar wood 2B, 2C, and employs a flat board material 2 having a thickness of 9 mm, a height of 600 mm, and a length of 1500 mm.

[0032] As shown in Figure 1(B), on the surface of rectangular flat plate material 2, perforated regions 3A1, 3A2 in which large-diameter 9 mm holes 5A are formed in a band-like shape with a longitudinal pitch of 20 mm, perforated regions 3B1, 3B2, 3B3 in which medium-diameter 8 mm holes 5B are formed in a band-like shape with a longitudinal pitch of 20 mm, perforated regions 3C1, 3C2 in which small-diameter 6 mm holes 5C are formed in a band-like shape with a longitudinal pitch of 20 mm, and non-perforated regions 4A, 4B, 4C, 4D, 4E formed in a band-like shape are formed in a predetermined pattern.

[0033] Next, a method for designing the acoustic control panel of the present invention will be described in detail below with reference to the drawings.

[0034] An acoustic control panel 101, in which holes 105 of a specified diameter are formed at a specified pitch on the surface of a flat plate material 102, can be understood as a resonator-type sound-absorbing material, and can be likened to an array of Helmholtz resonators (pots) 106, each with an opening diameter d, a narrow neck length l, a cavity depth L, and a volume V, as shown in Figure 4.

[0035] In this Helmholtz resonator (pot) 106, as shown in Figure 5, when sound energy is added to the opening, the air in the narrow neck moves vertically as a single mass, causing the air in the hollow part to vibrate vertically like a spring, and it can be thought that a sound absorption effect is achieved due to friction loss.

[0036] The resonant frequency fo of this Helmholtz resonator (pot) 106 can be expressed as the following formula 1 using the diameter d of the opening, the length l of the narrow neck, the depth L of the cavity, and the volume V.

[0037]

number

[0038] In this Helmholtz resonator (pot) 106, the sound absorption coefficient corresponding to the frequency of the sound exhibits a curve that exhibits a maximum value at the resonance frequency fo, as shown in FIG.

[0039] In spaces used for musical performances, such as music lesson rooms, the material of the acoustic control panel must be selected and the range of use must be determined so that the average sound absorption coefficient of the wall, ceiling, etc. has as flat a frequency characteristic as possible, as shown in Figure 7.

[0040] Here, in the conventional acoustic control panel 101, as shown in FIG. 8, holes 105 are uniformly formed with a predetermined diameter and a predetermined pitch over almost the entire surface area of ​​the rectangular flat plate material 102, so that each of the acoustic control panels 101C, 101D, and 101E absorbs only sounds in a specific narrow frequency range.

[0041] Therefore, in order to adjust the frequency characteristics, multiple types of acoustic control panels 101C, 101D, and 101E having holes 105C, 105D, and 105E with different diameters and pitches, as shown in Figure 9, must be adopted and combined in appropriate positions to form wall surfaces, ceiling surfaces, etc.

[0042] On the other hand, in the acoustic control panel 1 of the present invention, as shown in Figure 10, a plurality of perforated areas 3A, 3B, 3C are formed on the surface of a rectangular flat plate material 2, in which large, medium and small diameter holes 5A, 5B, 5C are formed in a band shape at a predetermined pitch, so that a single type of acoustic control panel 1 can absorb sounds in a wide frequency range.

[0043] Furthermore, in order to better adjust the frequency characteristics, as shown in Figure 11, two or so types of acoustic control panels 1C and 1D can be used, combined in appropriate positions, and arranged upside down, etc., to form wall surfaces, ceiling surfaces, etc., thereby creating an indoor space with extremely good frequency characteristics.

[0044] In other words, the design method for the acoustic control panel of the present invention involves forming a perforated area 3 having a band-like arrangement of holes in a predetermined pattern on a rectangular flat plate material 2 of appropriate dimensions, as shown in Figure 1, and forming a band-like non-perforated area 4.

[0045] In the longitudinally extending perforated array that forms the perforated region 3, the perforations 5 are formed as perforations 5A, 5B, 5C having a plurality of different diameters. Therefore, in one type of acoustic control panel 1, a plurality of types of perforated regions 3A, 3B, 3C consisting of hole portions 5A, 5B, 5C having different diameters are formed.

[0046] Furthermore, in each perforated region 3A, 3B, 3C, the number of perforated arrangements is appropriately set to single or multiple, and non-perforated regions 4A, 4B, ... of a predetermined width are formed at the upper and lower ends of the rectangular flat plate material 2 and between each perforated region 3A, 3B, 3C.

[0047] Furthermore, in terms of frequency characteristics, manufacturing and design, it is preferable to design each of the perforated regions 3A, 3B and 3C so that the longitudinal pitch of the corresponding holes 5A, 5B and 5C is the same.

[0048] As shown in Figure 3, the acoustic control panel 1 of the present invention is installed on a wall surface 11 of a music lesson room or the like via a support member 12, with a space 13 defined between the wall surface 11 and the acoustic control panel 1, and with a sound-absorbing member 14 placed on the back surface of the acoustic control panel 1, when in use.

[0049] Therefore, sound in a predetermined frequency band is reflected and diffused on the surface of the acoustic control panel 1, and at the same time, sound in a predetermined frequency band passes through the hole 5 and is absorbed by the space 13 and the sound absorbing member .

[0050] As shown in Figures 1(A) and (B), the acoustic control panel 1 of the present invention has a plurality of perforated regions 3A, 3B, 3C on the surface of a rectangular flat plate material 2, with large, medium and small diameter holes 5A, 5B, 5C formed in bands at a predetermined pitch in the longitudinal direction, and a plurality of non-perforated regions 4 formed in bands in a predetermined pattern.Therefore, the sound absorption and reflection performance, etc. can be varied in various ways depending on the material of the flat plate material 2, the diameter and pitch of the holes 5, and the pattern of the perforated regions 3 and non-perforated regions 4.

[0051] In a single acoustic control panel 1, the perforated areas 3A, 3B, 3C and the non-perforated areas 4A, 4B, ... each have different performance, and as shown in Figure 10, the sound absorption coefficient relative to sound frequency also shows balanced characteristics over a wide frequency band.

[0052] Furthermore, the relationship of sound absorption coefficient to sound frequency will be completely different depending on the different patterns of each acoustic control panel 1A, 1B. Therefore, by taking these characteristics into consideration and appropriately arranging multiple acoustic control panels 1, as shown in Figure 7, it is possible to optimize the acoustic environment in a room such as a music lesson room to an unprecedented degree.

[0053] Using the design method for an acoustic control panel of the present invention, an acoustic control panel 11 having the configuration shown in FIG. 12 and the specifications shown in FIG. 13 was actually designed and manufactured.

[0054] In this acoustic control panel 11, the sound absorption coefficients of the perforated areas 3A, 3B, 3C, and 3D and the non-perforated area 4 were calculated, and the predicted sound absorption coefficients of the acoustic control panel 11 were as shown in FIG.

[0055] Here, we assumed that multiple bands of conventional perforated and non-perforated plates were arranged within a single flat plate, with the long side extending in the length direction, and calculated the sound absorption coefficient. In addition, for the perforated areas 3A, 3B, and 3C, the sound absorption coefficient was calculated assuming that the volume of the back air space is doubled because they are adjacent to the band of non-perforated board.

[0056] Furthermore, when the opening ratio of the entire plate becomes small, it is believed that in addition to the performance of a perforated plate, the sound absorption performance due to the plate vibration of a non-perforated plate will also be exhibited, and this effect will be taken into account when calculating the sound absorption coefficient.

[0057] The predicted sound absorption coefficient of the acoustic control panel 11 can be calculated based on the sound absorption coefficients of the perforated and non-perforated regions by the following Equation 2.

[0058]

number

[0059] Furthermore, when the sound absorption coefficient of this acoustic control panel 11 was measured in a laboratory in accordance with ISO354, the results were as shown in FIG.

[0060] When the predicted sound absorption coefficient of the acoustic control panel 11 shown in Figure 14 and the measured sound absorption coefficient shown in Figure 15 were plotted on a graph, the result was as shown in Figure 16, which showed that the predicted values ​​and measured values ​​were highly consistent.

[0061] Next, a method for manufacturing an acoustic control panel of the present invention will be described in detail below with reference to the drawings.

[0062] When manufacturing a conventional acoustic control panel 101, for example, as shown in Figure 18, a flat plate material 102 is transported horizontally and longitudinally while drills 22, 22, ... attached at equal intervals in the perpendicular direction to a drilling device 21 are intermittently moved up and down to form holes uniformly over almost the entire surface area of ​​the flat plate material 102.

[0063] On the other hand, when manufacturing the acoustic control panel 1 of the present invention, as shown in Figure 19, the drills 22, 22, ... attached at appropriate positions to the drilling device 21 at equal intervals in the perpendicular direction are removed, and the diameter of the drills 22 at the appropriate positions is changed to a different one.

[0064] In this manner, using a manufacturing method similar to that used in the conventional method, the drills 22, 22, ... are moved up and down intermittently to manufacture an acoustic control panel 1 in which perforated areas 3 and non-perforated areas 4 are formed in an appropriate pattern in a flat plate material 2 as shown in Figure 17.

[0065] In other words, the manufacturing method for the acoustic control panel of the present invention involves removing drills 22 at appropriate positions from the drills 22, 22, ... attached at equal intervals in the perpendicular direction to the drilling device 21, changing the diameter of the drills 22 at appropriate positions to different ones, and intermittently moving the drills 22, 22, ... up and down while transporting the flat plate material 2 horizontally and longitudinally, to form perforated areas 3 and non-perforated areas 4 in an appropriate pattern in the flat plate material 2. It should be noted that the longitudinal pitch of the holes in one flat plate material 2 can also be changed by appropriately changing the time for which the drills 22, 22, . . . are intermittently moved up and down.

[0066] Furthermore, from the viewpoint of using materials without waste, it is preferable to manufacture an acoustic control panel 1 of a predetermined length by setting the length La of the flat plate material 2 to an integer multiple of a predetermined length unit L1 and cutting it in the orthogonal direction at an appropriate position corresponding to the integer multiple of that length unit L1.

[0067] As described above, according to the manufacturing method of the acoustic control panel of the present invention, the acoustic control panel 1 of the present invention can be manufactured in the same manner as conventional methods using a conventional drilling device 21 without requiring any special manufacturing process, and manufacturing costs are not increased.

[0068] Furthermore, the length La of the flat plate material 2 is an integer multiple of a predetermined length unit L1, and the flat plate material 2 is cut in the orthogonal direction at an appropriate position corresponding to an integer multiple of the length unit L1, so that an acoustic control panel 1 of a predetermined length can be manufactured using material without waste.

[0069] When optimizing the acoustic environment in a room such as a music lesson room, with the conventional acoustic control panel 101, only a single acoustic control panel 101 exhibited simple sound absorption and reflection performance, so as shown in FIG. 9, it was necessary to use many types of acoustic control panels 101C, 101D, and 101E.

[0070] On the other hand, according to the acoustic control panel 1 of the present invention, in a single acoustic control panel 1, the performance differs for each of the perforated areas 3 and non-perforated areas 4, making it possible to exhibit complex sound absorption and reflection performance, and the sound absorption coefficient for sound frequency also exhibits characteristics having good values ​​over a wide frequency band. Therefore, as shown in FIG. 11, even if a small number of types of acoustic control panels 1C and 1D are used, the acoustic environment can be optimized and delicate acoustic adjustments can also be made.

[0071] Furthermore, according to the acoustic control panel 1 of the present invention, as shown in FIG. 11, by using a single acoustic control panel 1 upside down, and even when each acoustic control panel 1 is installed upside down, different sound absorption and reflection performances can be exhibited. Taking this into consideration, it is possible to perform extremely versatile and delicate acoustic adjustments.

[0072] Furthermore, as can be easily understood by comparing Figures 9 and 11, when an acoustic control panel is installed on a wall, the conventional acoustic control panel 101 has an extremely large number of holes, which are formed all over the surface, giving the panel an extremely cluttered appearance.

[0073] On the other hand, in the acoustic control panel 1 of the present invention, the holes are formed only in certain areas and not over the entire surface, giving the appearance an extremely simple impression and improving the design of the wall surface and room.

[0074] Furthermore, by using multiple acoustic control panels 1 of different lengths and connecting adjacent acoustic control panels 1 at a predetermined angle, the sound absorption and reflection states can be adjusted appropriately, thereby further optimizing the acoustic environment.

[0075] Furthermore, when fine acoustic adjustment is required, the acoustic control panels 1A and 1B having the perforation pattern shown in FIG. 1(A) or (B) may be replaced with an acoustic control panel 1C having another perforation pattern.

[0076] As described above, by installing the acoustic control panel 1 of the present invention on the ceiling, walls, etc. of a room, it is possible to realize an indoor structure that can optimize the acoustic environment of the room to an unprecedented degree.

[0077] In the above embodiment, two types of acoustic control panels 1A and 1B have been described, each having a perforated area 3 and a non-perforated area 4 formed with a predetermined perforation pattern. However, it is of course possible to construct an acoustic control panel 1 having perforated areas 3 and non-perforated areas 4 formed with any other appropriate perforation pattern.

[0078] Furthermore, the material and dimensions of the flat plate material 2 of the acoustic control panel 1, the diameter and pitch of the holes 5, etc. are not limited to the above embodiment, and a more suitable acoustic control panel 1 can be produced by appropriate selection.

[0079] Furthermore, in the above embodiment, the acoustic control panel 1 is installed on the wall surface of the music lesson room. However, the acoustic control panel 1 may be installed not only on the wall surface, but also on the ceiling surface, pillar surface, and the like. Furthermore, as mentioned above, the present invention can of course be applied not only to music lesson rooms, but also to facilities such as concert halls, movie theaters, theaters, music lesson rooms, broadcasting studios, audiovisual rooms, and other facilities where it is necessary to improve or enhance the indoor acoustic environment. [Explanation of symbols]

[0080] 1. Sound control panel 1A, 1B Acoustic control panel 2 flat plate material 3 Perforated area 3A,3B,3C Perforated area 4 Non-porous area 4A,4B,4C,4D,4E Non-porous area 5 Hole 5A,5B,5C Hole

Claims

1. A method for manufacturing an acoustic control panel comprising drilling holes in a flat plate material, A method for manufacturing an acoustic control panel, comprising the steps of: detaching drills at appropriate positions attached at equal intervals in a direction perpendicular to a drilling device; changing the diameter of the drills at appropriate positions to different ones; transporting the flat plate material horizontally and lengthwise while intermittently moving the drills up and down to form perforated and non-perforated areas in an appropriate pattern in the flat plate material.

2. A method for manufacturing an acoustic control panel as described in claim 1, characterized in that the length of the flat plate material is set to an integer multiple of a predetermined length unit, and an acoustic control panel of a predetermined length is manufactured by cutting in an orthogonal direction at an appropriate position equivalent to the integer multiple of that length unit.

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