soundproofing device

Abstract

To provide a sound arrester adaptable to a plurality of frequencies in a space-saving manner.SOLUTION: A sound arrester 100 includes a plurality of acoustic tubes 110, and a moving device 120 coupled to the bottom of the plurality of acoustic tubes 110. The plurality of acoustic tubes 110 can be changed in length in the longitudinal direction by moving the bottom of the acoustic tubes. The moving device 120 includes a driving part 121 and a coupling part 122 that couples the driving part 121 and the bottom of the acoustic tubes 110. The moving device 120 further includes a control part 123 that controls the position of the bottom of the acoustic tubes 110 by means of the driving part 121.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] An embodiment of the present invention relates to a soundproofing device. [Background technology]

[0002] Conventionally, soundproofing devices have been installed between noisy areas and quiet areas to prevent the propagation of sound emanating from noise sources. Soundproofing devices are typically made of plate-shaped components (soundproofing materials) that have sound-blocking properties, and these soundproofing materials are often installed between the noisy and quiet areas to block the propagation of sound from the noise source. However, because sound has wave properties, sound diffraction can occur at the top of the soundproofing material, which can propagate to the quiet area and result in insufficient soundproofing. In such cases, increasing the height of the soundproofing material can achieve a certain level of effectiveness, but this increases the size of the soundproofing device and blocks visibility.

[0003] As a countermeasure against the above-mentioned sound diffraction phenomenon, a soundproofing device has been developed that reduces diffracted sound by providing a sound tube above the sound-insulating material (Patent Document 1). This conventional technology reduces diffracted sound by utilizing the phenomenon that incident sound into the sound tube and reflected sound from the inside of the sound tube interfere with each other and cancel each other out. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2017-111216 Summary of the Invention [Problem to be solved by the invention]

[0005] Generally, noise sources emit sounds of various frequencies, and the conditions for interference between incident and reflected sounds inside a sound tube vary depending on the frequency (i.e., wavelength) of the sound. The above-mentioned conventional technology uses a structure in which multiple types of sound tubes with different diameters and lengths are placed between sound-insulating materials to accommodate sounds of various frequencies, which results in an increase in the size of the soundproofing device in the thickness direction. While the increase in size of the device can be alleviated to some extent by reducing the number of types of sound tubes, this method has the problem of only being able to accommodate sounds of limited frequencies.

[0006] An object of one embodiment of the present invention is to provide a space-saving soundproofing device that can accommodate a plurality of frequencies. [Means for solving the problem]

[0007] In one embodiment of the present invention, a soundproofing device comprises a plurality of acoustic tubes and a moving device connected to the bottom of the plurality of acoustic tubes, and the longitudinal length of the plurality of acoustic tubes can be changed by moving the bottom of the acoustic tubes.

[0008] The moving device may include a drive unit and a connecting unit that connects the drive unit to the bottom of the acoustic tube.

[0009] The moving device may further include a control unit that controls the position of the bottom of the acoustic tube by the drive unit.

[0010] The mobile device may further include a sound acquisition unit communicatively connected to the control unit.

[0011] The plurality of acoustic tubes may be a space surrounded by a first wall material, a second wall material, and a first partition member disposed between the first wall material and the second wall material. In this case, the sound acquisition unit may be disposed in the first wall material and the second wall material.

[0012] The drive may be a power cylinder.

[0013] The moving device may include a gripping portion and a connecting portion that connects the gripping portion to the bottom of the acoustic tube.

[0014] The plurality of acoustic tubes may have open ends on the upper side.

[0015] The lengths of the plurality of acoustic tubes in the longitudinal direction may be changed collectively.

[0016] The plurality of acoustic tubes may include a first group of acoustic tubes and a second group of acoustic tubes, in which case the length of the first group of acoustic tubes in the longitudinal direction may be changeable to a length different from that of the second group of acoustic tubes. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a perspective view showing the configuration of a soundproofing device according to a first embodiment of the present invention. [Figure 2] 1 is a diagram showing a configuration of a soundproofing device according to a first embodiment of the present invention. [Figure 3] 1 is a front view showing the configuration of a soundproofing device according to a first embodiment of the present invention. [Figure 4] 1 is a front view showing the configuration of a soundproofing device according to a first embodiment of the present invention. [Figure 5] FIG. 10 is a diagram showing the results of a simulation verifying the soundproofing effect against a sound source with a frequency of 100 Hz. [Figure 6] FIG. 10 is a diagram showing the results of a simulation verifying the soundproofing effect against a sound source with a frequency of 100 Hz. [Figure 7] FIG. 10 is a diagram showing the results of a simulation verifying the soundproofing effect against a sound source with a frequency of 200 Hz. [Figure 8] FIG. 10 is a diagram showing the results of a simulation verifying the soundproofing effect against a sound source with a frequency of 200 Hz. [Figure 9] FIG. 4 is a diagram showing the configuration of a soundproofing device according to a second embodiment of the present invention. [Figure 10] FIG. 10 is a diagram showing the configuration of a soundproofing device according to a third embodiment of the present invention. [Figure 11] FIG. 10 is a front view showing the configuration of a soundproofing device according to a fourth embodiment of the present invention. [Figure 12] FIG. 10 is a side view showing the configuration of a soundproofing device according to a fifth embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0018] Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the present invention can be embodied in various forms without departing from the spirit of the present invention, and should not be construed as being limited to the description of the embodiments exemplified below. To clarify the explanation, the drawings may show the width, thickness, shape, etc. of each part more schematically than the actual form, but these are merely examples and do not limit the interpretation of the present invention. In this specification and each drawing, elements having the same functions as those described with reference to the previous drawings may be assigned the same reference numerals, and redundant explanations may be omitted.

[0019] (First embodiment) [Soundproofing device configuration] FIG. 1 is a perspective view showing the configuration of a soundproofing device 100 according to a first embodiment of the present invention. FIG. 2 is a diagram showing the configuration of the soundproofing device 100 according to the first embodiment of the present invention. Specifically, FIG. 2(A) is a front view showing the configuration of the soundproofing device 100, and FIG. 2(B) is a side view showing the configuration of the soundproofing device 100. Note that FIG. 1 shows a see-through view to explain the internal structure. Furthermore, for ease of explanation, FIGS. 1 and 2 show directions from the first direction (D1 direction) to the sixth direction (D6 direction). In this embodiment, a direction parallel to the first direction (D1 direction) or the second direction (D2 direction) may be referred to as the "thickness direction," a direction parallel to the third direction (D3 direction) or the fourth direction (D4 direction) may be referred to as the "width direction," and a direction parallel to the fifth direction (D5 direction) or the sixth direction (D6 direction) may be referred to as the "height direction."

[0020] The soundproofing device 100 of this embodiment is specifically a soundproof wall used as a partition in a room. Specifically, the soundproofing device 100 is a plate-like structure having a thickness of 10 to 15 cm, a height of 1 to 2 m, and a width of 1 to 1.5 m. However, these numerical values ​​are merely an example and do not limit the shape of the soundproofing device 100.

[0021] As shown in Figures 1 and 2, soundproofing device 100 includes wall material 101, wall material 102, and wall material 103 connecting wall material 101 and wall material 102. Wall material 101 and wall material 102 are plate-like members arranged facing each other. As shown in Figure 1, wall material 101 has a surface facing a first direction (direction D1), and wall material 102 has a surface facing a second direction (direction D2) opposite to the first direction. Wall material 103 corresponds to a side surface of soundproofing device 100 and has a surface facing a third direction (direction D3) or a fourth direction (direction D4) that is perpendicular to the first and second directions.

[0022] A plurality of partition members 104 and 105 are arranged in a space surrounded by wall material 101, wall material 102, and wall material 103 (hereinafter referred to as the "internal space"). The plurality of partition members 104 are members that divide the internal space in the width direction, and are arranged fixedly to wall material 101 and wall material 102. The plurality of partition members 105 are members that divide the internal space in the height direction, and are arranged without being fixed to any of wall material 101, wall material 102, wall material 103, and partition member 104. In other words, partition member 105 is movable in the height direction within the space surrounded by any of wall material 101, wall material 102, wall material 103, and partition member 104. The size of partition member 105 may be any size that fits exactly within the space surrounded by any of wall material 101, wall material 102, wall material 103, and partition member 104, or may be slightly smaller than the space.

[0023] In this embodiment, a tubular space (space indicated by diagonal lines in FIG. 1) formed by combining any one of wall material 101, wall material 102, wall material 103, partition member 104, and partition member 105 is used as the acoustic tube 110. That is, as shown in FIGS. 1 and 2, the acoustic tube 110 of this embodiment is formed as a tubular space having any one of wall material 101, wall material 102, wall material 103, and partition member 104 as side walls and partition member 105 as a bottom. Partition member 105, which is the bottom of acoustic tube 110, is supported by connecting portion 122, which will be described later, and is movable in the height direction, so that the longitudinal length (height direction) of acoustic tube 110 can be changed.

[0024] In FIG. 1, the acoustic tube 110 has an open end at the top. That is, the top of each acoustic tube 110 is an open end. As shown in FIG. 1, the outer shape of the open end of the acoustic tube 110 is rectangular. However, this is not limited to this example, and the open end of the acoustic tube 110 may have other shapes, such as a circle, an ellipse, or a polygon. In addition, in this embodiment, when the inner diameter of the acoustic tube 110 (the length of one side if the cross section is square, or the diameter if the cross section is circular) is D, the wavelength λ of the sound to be soundproofed is set so that D<0.59λ. In other words, in the soundproofing device 100 of this embodiment, the distance between the wall material 101 and the wall material 102 and the distance between two adjacent partition members 104 (or the distance between the wall material 103 and the partition member 104) are set to be smaller than 0.59λ. If these conditions are met, the sound that enters the inside of the sound tube 110 can be regarded as a plane wave, and therefore the sound pressure distribution inside the sound tube 110 only needs to be considered in the length direction.

[0025] Next, the soundproofing device 100 of this embodiment includes a moving device 120 below the multiple acoustic tubes 110, connected to each of the acoustic tubes 110. The moving device 120 is connected to the bottom of the acoustic tube 110, i.e., the partition member 105. The moving device 120 of this embodiment includes a driving unit 121, a connecting unit 122 that connects the driving unit 121 to the bottom of the acoustic tube 110 (the partition member 105), and a control unit 123 that controls the driving unit. The moving device 120 has the function of changing the longitudinal (height) length of the acoustic tube 110 (hereinafter simply referred to as the "length of the acoustic tube 110") by driving the driving unit 121 to move the bottom of the acoustic tube 110 in the height direction via the connecting unit 122.

[0026] The driving unit 121 has an extension / contraction unit 121a whose length is variable in the height direction, and by extending or contracting the extension / contraction unit 121a, the connecting unit 122 is moved in the height direction. Any mechanical device may be used as the driving unit 121 as long as it is an actuator capable of extension / contraction. For example, the driving unit 121 may be a hydraulic, pneumatic (gas pressure), water hydraulic, or electric jack, or a power cylinder. Alternatively, the driving unit 121 may be a mechanical device including a rack and pinion.

[0027] The connecting unit 122 includes a support member 122a and a connecting member 122b. The support member 122a is connected to the extension / contraction unit 121a of the driving unit 121 and supports the multiple connecting members 122b. The support member 122a may be a plate-shaped member made of a hard material such as a metal or plastic material. Each connecting member 122b connects the support member 122a to each partition member 105. In this embodiment, an example is shown in which a cylindrical member made of a plastic material is used as the connecting member 122b. However, any material and shape may be used as long as the member has the strength to support the partition member 105 and transmit the movement of the support member 122a in the vertical direction. When the extension / contraction unit 121a of the driving unit 121 performs an extension / contraction operation, the entire connecting unit 122 moves in the vertical direction, and each partition member 105 also moves in the vertical direction.

[0028] The control unit 123 has a function of controlling the driving unit 121. For example, a DSP (Digital Signal Processor) can be used as the control unit 123. The control unit 123 can adjust the position of the partition member 105 in the height direction by controlling the extension and contraction operation of the driving unit 121. The amount of movement of the bottom of the acoustic tube 110 (partition member 105) can be controlled by adjusting the amount of extension and contraction of the extension and contraction part 121a of the driving unit 121. In other words, the control unit 123 can control the position of the bottom of the acoustic tube 110 via the driving unit 121.

[0029] In this embodiment, the control unit 123 can be configured to receive instructions from an external terminal (for example, a mobile terminal such as a smartphone). That is, the external terminal and the control unit 123 can communicate with each other via short-range wireless communication or a wireless network. Therefore, a user who owns the external terminal can adjust the length of the acoustic tube 110 by sending an instruction signal to the control unit 123.

[0030] As explained above, the soundproofing device 100 of this embodiment is equipped with a plurality of acoustic tubes 110 and a moving device 120 that moves the bottom of each acoustic tube 110 in the height direction, thereby making it possible to change the length of each acoustic tube 110 all at once. In other words, by changing the length of the acoustic tubes 110, the soundproofing device 100 can exert a soundproofing effect against sounds of various frequencies.

[0031] [Soundproofing device in operation] As a general principle of waves, the reflected wave at the fixed end is out of phase with the incident wave by 180° (i.e., half the wavelength). Therefore, when a sound wave with a wavelength λ enters a tubular space with a length of λ / 4, the reflected wave reflected at the closed end (partition member 105) and the incident wave interfere with each other and cancel each other out. Soundproofing devices using acoustic tubes achieve soundproofing effects by applying this principle. However, there are various sounds around us, such as noise emitted from machines and people speaking, and these each have a different frequency (i.e., different wavelength). Therefore, as explained in the prior art, in order to deal with sounds of various frequencies, it was necessary to prepare acoustic tubes of lengths corresponding to each frequency.

[0032] In contrast, the soundproofing device 100 of this embodiment has movable bottoms of the multiple acoustic tubes 110, so the positions of the bottoms can be controlled. That is, the soundproofing device 100 can freely adjust its length in the longitudinal direction (height direction), so it can handle sounds of multiple frequencies using the same acoustic tube.

[0033] 3 and 4 are front views showing the configuration of the soundproofing device 100 according to the first embodiment of the present invention. Specifically, Fig. 3 shows an example in which the length of each sound tube 110 is set to L1, and Fig. 4 shows an example in which the length of each sound tube 110 is set to L2, which is shorter than L1. As shown in Figs. 3 and 4, the movement device 120 can change the length of each sound tube 110 from L1 to L2 by extending the extension / contraction section 121a of the drive section 121 in the height direction.

[0034] For example, if the frequency (f) of the sound to be soundproofed is 100 Hz and the speed of sound (c) is 340 m / s, the wavelength (λ) of the sound is λ = c / f = 3.4 m. That is, in Figure 3, if you set L1 = λ / 4 = 0.85 m, you can achieve soundproofing effects against 100 Hz sounds. Similarly, if you change the frequency (f) of the sound to be soundproofed to 200 Hz, the wavelength (λ) is λ = c / f = 1.7 m. Therefore, in Figure 4, if you set L2 = λ / 4 = 0.425 m, you can achieve soundproofing effects against 200 Hz sounds.

[0035] [Effect of soundproofing devices] Figures 5 and 6 are diagrams showing the results of a simulation verifying the soundproofing effect against a sound source with a frequency of 100 Hz. Specifically, Figure 5(A) shows the distribution of sound pressure levels of diffracted sound when a normal soundproof wall (a simple plate-like wall member) is placed near a sound source with a frequency of 100 Hz, and Figure 5(B) shows the distribution of sound pressure levels of diffracted sound when the soundproof wall of this embodiment (soundproofing device 100) is placed near a sound source with a frequency of 100 Hz. Figure 6 shows the distribution of the difference in sound pressure levels of the diffracted sounds based on the simulation results shown in Figures 5(A) and 5(B).

[0036] The simulation of this embodiment was performed under the assumption that a sound source with a sound pressure of 1 Pa was located in front of a soundproof wall that was 1500 mm high, 1000 mm wide, and 100 mm thick. The sound source was located 1000 mm away from the soundproof wall and at a height of 1000 mm from the installation surface of the soundproof wall.

[0037] As shown in Fig. 5(A), a normal soundproof wall exhibits a sound pressure level of about 65 dB at a position opposite the sound source, whereas as shown in Fig. 5(B), the soundproof wall of this embodiment exhibits a sound pressure level of about 60 dB at a position opposite the sound source. In other words, as shown in Fig. 6, when the soundproof wall of this embodiment was used, a reduction in sound pressure level of about 5.0 dB was observed compared to a normal soundproof wall.

[0038] 7 and 8 are diagrams showing the results of a simulation verifying the soundproofing effect against a sound source with a frequency of 200 Hz. Specifically, FIG. 7(A) shows the distribution of sound pressure levels of diffracted sound when a normal soundproof wall is placed near a sound source with a frequency of 200 Hz, and FIG. 7(B) shows the distribution of sound pressure levels of diffracted sound when the soundproof wall of this embodiment is placed near a sound source with a frequency of 200 Hz. FIG. 8 shows the distribution of the difference in sound pressure levels of the diffracted sounds based on the simulation results shown in FIGS. 7(A) and 7(B). The simulation conditions are the same as those described above.

[0039] As a result, as shown in Fig. 7(A), a normal soundproof wall exhibited a sound pressure level of about 70 dB at a position opposite the sound source, whereas as shown in Fig. 7(B), the soundproof wall of this embodiment exhibited a sound pressure level of about 65 dB at a position opposite the sound source. In other words, as shown in Fig. 8, when the soundproof wall of this embodiment was used, a reduction in sound pressure level of about 5.0 dB was observed compared to a normal soundproof wall.

[0040] As described above, the soundproofing device 100 of this embodiment is equipped with multiple sound tubes 110 and a moving device 120 that moves the bottom of each sound tube 110, thereby making it possible to change the length of each sound tube 110. This makes it possible to change the length of each sound tube 110 to match the frequency of the sound to be soundproofed, making it possible to accommodate sounds of various frequencies. Therefore, the soundproofing device 100 does not need to be equipped with multiple types of sound tubes as in the prior art. In this way, according to this embodiment, it is possible to provide a space-saving soundproofing device that can accommodate multiple frequencies.

[0041] The soundproofing device 100 of this embodiment is suitable as a partition used in, for example, a conference room, lobby, etc. Specifically, a free space surrounded by a partition can be provided in a portion of the conference room, lobby, etc., and used for meetings, business negotiations, etc. It is generally known that the frequency of a woman's voice is approximately twice that of a man's voice. In this case, the soundproofing device 100 can flexibly change the sound to be soundproofed by changing the length of the acoustic tube 110 depending on the gender of the user of the free space. Furthermore, the soundproofing device 100 can change the soundproofing target simply by changing the position of the bottom of the acoustic tube 110, without changing its appearance. In other words, the soundproofing device 100 of this embodiment can achieve soundproofing effects against sounds of various frequencies while keeping its height low, without unnecessarily obstructing the user's view.

[0042] (Variation 1) 1 and 2, the moving device 120 has been described as having a control unit 123, but this is not limited to this example. In other words, if there is a means for driving the driving unit 121 separate from the control unit 123, the control unit 123 is not an essential component. For example, if the driving unit 121 is configured so that the extension and retraction operation of the extension and retraction unit 121a can be achieved by operating a handle or the like, the control unit 123 may be omitted. Furthermore, if the driving unit 121 has a communication function and a control function, the control unit 123 may not be provided separately from the driving unit 121.

[0043] (Variation 2) Although the soundproofing device 100 of this embodiment has been described as an example in which the drive unit 121 is disposed between the wall material 101 and the wall material 102, the present invention is not limited to this example. For example, the drive unit 121 may be disposed outside the wall material 101 and the wall material 102, and the external drive unit 121 may be used to move the connecting part 122 in the height direction.

[0044] For example, when soundproofing device 100 is used as a stationary partition, drive unit 121 may be provided below soundproofing device 100 (specifically, under the floor, etc.), with only expansion / contraction unit 121a passing between wall material 101 and wall material 102 and connected to connection unit 122. In this case, drive unit 121 does not need to be provided in the gap between wall material 101 and wall material 102, and therefore drive unit 121 can be selected without worrying about size restrictions.

[0045] (Second embodiment) In this embodiment, a soundproofing device 200 having a different structure from that of the first embodiment will be described. Specifically, the soundproofing device 200 of this embodiment has a mechanism for adjusting the length of the acoustic tube 110 based on a signal from a sound acquisition unit 210. In this embodiment, the same elements as those in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

[0046] Fig. 9 is a diagram showing the configuration of a soundproofing device 200 in a second embodiment of the present invention. As shown in Fig. 9, in this embodiment, a sound acquisition unit 210a is arranged near the center of the upper part of wall material 101 of soundproofing device 200, and a sound acquisition unit 210b is arranged near the center of the upper part of wall material 102. In the following description, when there is no need to distinguish between sound acquisition unit 210a and sound acquisition unit 210b, they will be referred to as sound acquisition unit 210.

[0047] The sound acquisition unit 210 is communicatively connected to the control unit 223 and transmits a sound signal to the control unit 223. The sound acquisition unit 210 may be, for example, a microphone or a device that combines a microphone and an amplifier. The sound acquisition unit 210 has a function of acquiring sounds emitted in the surrounding area and converting the sounds into electrical signals.

[0048] In this embodiment, the sound acquisition unit 210a mainly acquires sounds emitted in front of the wall material 101. For example, when a free space is set up using the soundproofing device 200, if the wall material 101 faces inward, the sound acquisition unit 210a mainly acquires the voices of people speaking in the free space. The sound acquisition unit 210b mainly acquires sounds emitted in front of the wall material 102. Therefore, in the case of the free space using the soundproofing device 200 described above, the wall material 102 faces outward, so the sound acquisition unit 210b mainly acquires sounds generated outside the free space.

[0049] In this way, in this embodiment, multiple microphones are used to acquire sounds from multiple different sound sources. In the above example, it is preferable to use directional microphones as the microphones. By using directional microphones, it is possible to collect sounds with high accuracy using multiple microphones.

[0050] The sound signal acquired by the sound acquisition unit 210 is transmitted to the control unit 223. The control unit 223 analyzes the received sound signal to determine the frequency of the sound, and calculates the wavelength of the sound from the frequency of the sound determined by analysis. The control unit 223 then adjusts the length of each sound tube 110 based on the calculated wavelength of the sound. In other words, the control unit 223 controls the position of the bottom (partition member 105) of each sound tube 110 so that the length of each sound tube 110 is 1 / 4 of the calculated wavelength of the sound.

[0051] As described above, in this embodiment, the length of each acoustic tube 110 can be changed based on the sound acquired by the sound acquisition unit 210, and control can be performed so that the soundproofing device 200 exerts a soundproofing effect suited to the acquired sound. To this end, the control unit 223 analyzes the sound signal received from the sound acquisition unit 210 to calculate the wavelength of the sound, and controls the drive unit 121 based on the calculated sound.

[0052] In the present embodiment, the control unit 223 controls the soundproofing device 200 based on the louder of the sounds acquired by the sound acquisition units 210a and 210b. However, this example is not limiting, and the soundproofing device 200 may be controlled based on a sound selected according to other conditions. For example, when a meeting is held in a free space surrounded by the soundproofing device 200, the soundproofing device 200 may be set to be controlled based on the sound acquired by the sound acquisition unit 210b so as to block outside sounds. Conversely, when the contents of the meeting should not be overheard by outsiders, the soundproofing device 200 may be set to be controlled based on the sound acquired by the sound acquisition unit 210a. Furthermore, the control unit 223 may determine whether to perform control based on the sound acquired by the sound acquisition units 210a and 210b, or the sound to be soundproofed may be specified to the control unit 223 from an external terminal (for example, a mobile terminal such as a smartphone) or by a mechanical switch or the like.

[0053] (Variation) In the present embodiment, an example has been shown in which one microphone is arranged on one wall material as the sound acquisition unit 210, but the present invention is not limited to this example, and the number of microphones arranged on one wall material may be two or more. For example, microphones may be provided at two corners of the upper part of the wall material 101, and the soundproofing device 200 may be controlled based on the average value of the sounds acquired by the two microphones. Furthermore, in the example shown in FIG. 9, an example has been shown in which the sound acquisition unit 210 is arranged on each of the wall materials 101 and 102, but a configuration in which the sound acquisition unit 210 is arranged on only one of them may also be used.

[0054] (Third embodiment) In this embodiment, a soundproofing device 300 having a different structure from that of the first embodiment will be described. Specifically, the soundproofing device 300 of this embodiment has a function of manually changing the lengths of the multiple acoustic tubes 110. In this embodiment, the same elements as those in the first embodiment will be designated by the same reference numerals, and detailed description thereof will be omitted.

[0055] Fig. 10 is a diagram showing the configuration of a soundproofing device 300 according to a third embodiment of the present invention. Specifically, Fig. 10(A) is a front view showing the configuration of the soundproofing device 300, and Fig. 10(B) is a side view showing the configuration of the soundproofing device 300. The soundproofing device 300 of this embodiment has a moving device 320. The moving device 320 includes a gripping portion 310 and a connecting portion 122.

[0056] Similar to the first embodiment, the connecting portion 122 is composed of a support member 122a and a connecting member 122b. In this embodiment, a grip portion 310 is fixed to the support member 122a of the connecting portion 122. The grip portion 310 is a portion that is held by a person and corresponds to a handle. In this embodiment, an example is shown in which two grip portions 310 are provided at the ends in the width direction of the support member 122a, but this is not limiting, and a single grip portion 310 may be provided near the center in the width direction of the support member 122a.

[0057] In the soundproofing device 300 of this embodiment, the user changes the position of the bottom of each acoustic tube 110 by lifting the connecting portion 122 using the grip portion 310. In other words, the length of each acoustic tube 110 in the soundproofing device 300 can be changed manually. For this reason, as shown in Fig. 10, the wall material 301 is provided with a slit 301a extending in the height direction so that the grip portion 310 can be moved in the height direction.

[0058] When the moving device 320 is configured to be manually operable as in this embodiment, the driving unit 121 and the control unit 123 that were included in the soundproofing device 100 of the first embodiment can be omitted. In other words, since the driving unit 121, which is an actuator, can be omitted, the weight of the soundproofing device 300 can be reduced. Furthermore, since the number of parts can be reduced, the manufacturing cost of the soundproofing device 300 can be reduced.

[0059] Although not shown in Fig. 10, an indicator for aligning the grip portion 310 may be provided next to the slit 301a. For example, an indicator labeled "Male" and "Female" may be provided next to the slit 301a, and when the grip portion 310 is aligned with the indicator labeled "Male," the length of each sound tube 110 may be set to a length corresponding to the frequency of a male voice. In other words, if the sound to be soundproofed is known in advance, providing an indicator corresponding to the sound source allows the user of the soundproofing device 300 to manually adjust the length of the sound tube 110 to match the sound to be soundproofed.

[0060] (Fourth embodiment) In this embodiment, a soundproofing device 400 having a different structure from that of the first embodiment will be described. Specifically, the soundproofing device 400 of this embodiment is structured to simultaneously obtain a soundproofing effect against sounds of multiple frequencies. In this embodiment, the same elements as those in the first embodiment will be designated by the same reference numerals, and detailed description thereof will be omitted.

[0061] 11 is a front view showing the configuration of a soundproofing device 400 according to a fourth embodiment of the present invention. The soundproofing device 400 has a plurality of acoustic tubes 110 divided into a plurality of groups, and the length of each acoustic tube 110 in each group can be changed independently.

[0062] As shown in Fig. 11, the soundproofing device 400 includes a first group 410a consisting of a plurality of acoustic tubes 110a and a second group 410b consisting of a plurality of acoustic tubes 110b. A driver 421a is connected to each acoustic tube 110a in the first group 410a via a connector 422a. A driver 421b is connected to each acoustic tube 110b in the second group 410b via a connector 422b. The drivers 421a and 421b are controlled by controllers 423a and 423b, respectively. The operation of each component is the same as in the first embodiment, and therefore a detailed description thereof will be omitted here.

[0063] The soundproofing device 400 of this embodiment can independently control the length of the acoustic tubes 110a of the first group 410a and the length of the acoustic tubes 110b of the second group 410b, thereby simultaneously achieving soundproofing effects against sounds of two frequencies. Compared to the soundproofing device 100 of the first embodiment, the first group 410a and the second group 410b each have half the number of acoustic tubes, resulting in a slightly reduced soundproofing effect. However, the soundproofing effect is not simply halved, and the device is still able to adequately protect against sounds of two different frequencies.

[0064] In this embodiment, an example of a configuration that can accommodate two types of frequencies has been shown, but this is not limiting and a configuration that can accommodate three or more types of frequencies may also be used. In this case, multiple acoustic tubes 110 can be divided into three or more groups and controlled independently. Therefore, by providing one driving unit for each acoustic tube, it is also possible to control each individual acoustic tube independently.

[0065] It is effective to provide the sound acquisition unit 210 to the soundproofing device 400 of this embodiment as in the soundproofing device 200 of the second embodiment. For example, as in the second embodiment, it is possible to provide the sound acquisition unit 210a to the wall material 101 and the sound acquisition unit 210b to the wall material 102. In this case, the soundproofing device 400 can independently control the acoustic tubes 110a of the first group 410a and the acoustic tubes 110b of the second group 410b based on the sounds of two different frequencies acquired by the sound acquisition units 210a and 210b.

[0066] (Fifth embodiment) In this embodiment, a soundproofing device 500 having a different structure from that of the first embodiment will be described. Specifically, the soundproofing device 500 of this embodiment has a structure that can simultaneously obtain a soundproofing effect against sounds of multiple frequencies, similar to the soundproofing device 400 of the fourth embodiment. In this embodiment, the same elements as those in the first embodiment will be designated by the same reference numerals, and detailed description thereof will be omitted.

[0067] 12 is a side view showing the configuration of a soundproofing device 500 according to a fifth embodiment of the present invention. The soundproofing device 500 has a structure in which acoustic tubes 110 are stacked in the thickness direction. Specifically, the acoustic tubes 110 are divided into multiple groups, and the length of each acoustic tube 110 in each group can be changed independently.

[0068] 12, the soundproofing device 500 includes a first group 510a consisting of a plurality of acoustic tubes 110a and a second group 510b consisting of a plurality of acoustic tubes 110b. Although not shown, the acoustic tubes 110a and 110b are arranged side by side in the width direction of the soundproofing device 500, similar to the acoustic tube 110 shown in FIG.

[0069] The driver 521 is connected to each acoustic tube 110a of the first group 510a via a connecting portion 522a, and to each acoustic tube 110b of the second group 510b via a connecting portion 522b. At this time, the connecting portion 522a moves in the height direction by the expandable portion 521a of the driver 521, and the connecting portion 522b moves in the height direction by the expandable portion 521b of the driver 521. The driver 521 is controlled by a control portion 523. The operation of each component is the same as in the first embodiment, so a detailed description will be omitted here.

[0070] The soundproofing device 500 of this embodiment can independently control the length of the acoustic tubes 110a of the first group 510a and the length of the acoustic tubes 110b of the second group 510b, thereby simultaneously achieving soundproofing effects against sounds of two frequencies. For example, when two different groups are conducting business negotiations separated by a partition, soundproofing effects can be achieved for both groups. This embodiment is particularly effective when combined with the second embodiment. Specifically, as in the second embodiment, the sound acquisition unit acquires sounds from the D1 direction and the D2 direction, respectively, and the control unit 523 analyzes both sounds, thereby individually adjusting the lengths of the acoustic tubes 110a and 110b according to the acquired sounds.

[0071] In this embodiment, an example of a configuration that can accommodate two types of frequencies has been shown, but the present invention is not limited to this example, and a configuration that can accommodate three or more types of frequencies may be used. In this case, three or more groups may be provided in the thickness direction and each group may be controlled independently.

[0072] In addition, in this embodiment, a configuration has been described in which the driver 521 and the controller 523 are shared between the acoustic tube 110a and the acoustic tube 110b, but this is not limited to this example. For example, it is possible to provide separate drivers and controllers for the acoustic tube 110a and the acoustic tube 110b, or it is also possible to provide separate drivers and controllers and share only the controller.

[0073] (Sixth embodiment) In the first to fifth embodiments, the soundproofing device is used as a partition in a conference room or a room, but the use of the soundproofing device in the embodiments of the present invention is not limited to use as a partition. For example, the soundproofing device in one embodiment of the present invention may be used as a soundproof wall that blocks noise emitted from machinery at a construction site, factory facility, etc.

[0074] The embodiments of the present invention and their modifications can be combined as appropriate as long as they are not mutually inconsistent. Those in which a person skilled in the art appropriately adds or deletes components or modifies designs, or adds or omits processes or modifies conditions, based on the soundproofing devices of the above-described embodiments or their modifications, are also included in the scope of the present invention as long as they include the gist of the present invention.

[0075] Furthermore, even if there are other effects and advantages different from those brought about by the above-mentioned embodiments or their modified forms, if these are clear from the description in this specification or can be easily predicted by a person skilled in the art, they are naturally understood to be brought about by the present invention. [Explanation of symbols]

[0076] 100, 200, 300, 400, 500... soundproofing device, 101, 102, 103, 301... wall material, 104, 105... partition member, 110, 110a, 110b... acoustic tube, 120, 320... moving device, 121, 421a, 421b, 521... driving unit, 121a, 521a, 521b... telescopic unit, 122, 422a, 422b, 522a, 522b...connecting portion, 122a...supporting member, 122b...connecting member, 123, 223, 423a, 423b, 523...control portion, 210, 210a, 210b...sound acquiring portion, 301a...slit, 310...gripping portion, 410a, 510a...first group, 410b, 510b...second group

Claims

1. a plurality of acoustic tubes, each of which is formed by a space surrounded by a first wall material, a second wall material, and a first partition member and a second partition member disposed between the first wall material and the second wall material; a moving device coupled to the bottom of the plurality of acoustic tubes; Equipped with The inner diameter D of each acoustic tube is set so that D<0.59λ, where λ is the wavelength of the sound to be soundproofed. Each acoustic tube has an open end that opens upward, the moving device includes a plurality of connecting members connected to the plurality of second partition members that form the bottoms of the plurality of acoustic tubes, a support member that commonly supports the plurality of connecting members, and a drive unit connected to the support member, A soundproofing device in which the longitudinal lengths of the multiple acoustic tubes can be changed collectively by the drive unit moving the support member in the height direction.

2. The soundproofing device according to claim 1 , wherein the moving device is disposed between the first wall material and the second wall material.

3. The soundproofing device according to claim 2 , wherein the moving device further includes a control unit that controls the position of the bottom of the sound tube by the drive unit.

4. The soundproofing device according to claim 3 , wherein the mobile device further includes a sound acquisition unit communicatively connected to the control unit.

5. The soundproofing device according to claim 4 , wherein the sound acquisition unit is disposed on the first wall material and the second wall material.

6. 6. The soundproofing device according to claim 2, wherein the drive unit is a power cylinder.

7. the plurality of acoustic tubes includes a first group of acoustic tubes and a second group of acoustic tubes; 7. The soundproofing device according to claim 1, wherein the first group of acoustic tubes has a length in the longitudinal direction that is changeable to a length different from that of the second group of acoustic tubes.

8. The soundproofing device according to claim 7 , wherein the first group of acoustic tubes and the second group of acoustic tubes are arranged to overlap each other in the thickness direction.

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