WO2023181832A1 - Acoustic apparatus - Google Patents

Acoustic apparatus Download PDF

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Publication number
WO2023181832A1
WO2023181832A1 PCT/JP2023/007798 JP2023007798W WO2023181832A1 WO 2023181832 A1 WO2023181832 A1 WO 2023181832A1 JP 2023007798 W JP2023007798 W JP 2023007798W WO 2023181832 A1 WO2023181832 A1 WO 2023181832A1
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WO
WIPO (PCT)
Prior art keywords
housing
acoustic
acoustic tube
standing wave
absorbing material
Prior art date
Application number
PCT/JP2023/007798
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French (fr)
Japanese (ja)
Inventor
諒也 田畑
勝也 内田
由和 本地
Original Assignee
ヤマハ株式会社
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Publication of WO2023181832A1 publication Critical patent/WO2023181832A1/en

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    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/02—Casings; Cabinets ; Supports therefor; Mountings therein
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means

Definitions

  • the present invention relates to an audio device.
  • Patent Document 1 describes an acoustic device such as a speaker that includes a housing having a space inside, and an acoustic tube (bass reflex tube) that is open at both ends and connects the inside of the housing to the outside by being provided in the opening of the housing.
  • acoustic tube bass reflex tube
  • a configuration having a port is disclosed.
  • This type of acoustic device can emit sound with acoustic characteristics that have an enhanced bass range using a sound tube.
  • an acoustic device having a housing when a sound wave having a natural frequency is radiated into the interior of the housing, a standing wave of sound is generated inside the housing.
  • the standing waves are undesirable because they adversely affect the acoustic characteristics of the acoustic device (frequency characteristics of the sound emitted from the acoustic device).
  • the length of the acoustic tube is made approximately equal to the distance between a pair of opposing surfaces forming the inner surface of the housing, and the inner open end of the acoustic tube that opens inside the housing is It is placed near one of the opposing surfaces. This reduces the generation of standing waves of sound generated inside the housing.
  • acoustic device including a housing and an acoustic tube
  • strong tube resonance especially primary resonance
  • the tube resonance of the acoustic tube adversely affects the acoustic characteristics of the acoustic device.
  • the sound absorbing material obstructs the reinforcement of the bass range (bass reinforcement) by the acoustic tube.
  • the present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide an acoustic device capable of suppressing tube resonance of an acoustic tube while suppressing inhibition of bass enhancement by the acoustic tube. With the goal.
  • One aspect of the present invention includes a casing, an inner opening end opening into the inside of the casing, and an outer opening end opening outside the casing, and a standing wave generated in the casing.
  • an acoustic tube having a primary resonance frequency close to a frequency of Let ⁇ be the wavelength at the resonant frequency generated by coupling with the existing wave, and let the propagation direction be the direction in which the standing wave propagates inside the housing, and approximately ⁇ from the first surface of the housing in the propagation direction. and a sound absorbing material placed at a distance of 1/4.
  • the present invention it is possible to suppress the tube resonance of the acoustic tube while suppressing the obstruction of bass enhancement by the acoustic tube.
  • FIG. 1 is a sectional view showing an acoustic device according to an embodiment of the present invention.
  • 2 is a sectional view taken along line II-II in FIG. 1.
  • FIG. FIG. 3 is a diagram showing an example of a standing wave generated by coupling of the primary resonance of the acoustic tube and a standing wave generated in the casing in a configuration in which the sound absorbing material is removed from the acoustic device of FIGS. 1 and 2.
  • FIG. FIG. 3 is a diagram showing an example of standing waves generated in the housing of the acoustic device shown in FIGS. 1 and 2.
  • the audio device 1 of this embodiment is a speaker such as a bass reflex speaker. As shown in FIGS. 1 and 2, the acoustic device 1 includes a housing 2, an acoustic tube 3, and a sound absorbing material 4. The audio device 1 of this embodiment, which is a speaker, further includes a speaker unit (not shown).
  • the housing 2 is a box with a space inside.
  • the appearance of the casing 2 and the specific shape of the space within the casing 2 may be arbitrary.
  • the space inside the housing 2 is formed in the shape of a rectangular parallelepiped.
  • the outer appearance of the casing 2 is formed in the shape of a rectangular parallelepiped, which is slightly larger than the space inside the casing 2.
  • the direction in which the long sides of the housing 2 extend is shown as the Z-axis direction.
  • the direction in which one short side of the casing 2 that is perpendicular to the long side extends is shown as the X-axis direction
  • the direction in which another short side of the casing 2 that is perpendicular to the long side and one short side extends is shown as the Y-axis direction. It is shown in
  • a speaker unit is provided in the housing 2 as a sound source.
  • the sound generated in the speaker unit propagates to both the outside and inside of the housing 2.
  • a standing wave is generated inside the housing 2 or primary resonance of the acoustic tube 3 is generated.
  • the acoustic tube 3 is a tube that connects the space inside the housing 2 and the outside of the housing 2.
  • the acoustic tube 3 has an inner open end 31 that opens into the interior of the housing 2 and an outer open end 32 that opens to the outside of the housing 2.
  • the acoustic tube 3 extends only from the inner surface of the casing 2 to the inside of the casing 2, and does not extend to the outside of the casing 2. Therefore, the inner open end 31 of the acoustic tube 3 is located in the space inside the housing 2, and the outer open end 32 of the acoustic tube 3 is located on the outer surface of the housing 2.
  • the acoustic tube 3 may extend, for example, both inside and outside the housing 2. That is, the outer open end 32 of the acoustic tube 3 may be located away from the outer surface of the housing 2, for example.
  • the primary resonance frequency generated in the acoustic tube 3 is close to the frequency of the standing wave generated in the housing 2.
  • the "standing wave generated in the casing 2" is a combination of a sound wave propagating from one of the two inner surfaces of the casing 2 facing each other to the other, and a sound wave propagating from the other of these two inner surfaces to one side. This causes the problem to occur inside the casing 2.
  • the standing wave generated in the casing 2 is a standing wave generated between the first surface 21 and the second surface 22 of the casing 2, which are the inner surfaces of the casing 2 and are opposed to each other in the Z-axis direction. It's a wave.
  • the propagation direction of the standing wave generated in the housing 2 is the direction in which the first surface 21 and the second surface 22 are lined up, that is, the Z-axis direction.
  • the first surface 21 and the second surface 22 of the casing 2 are surfaces facing inward of the casing 2 and are perpendicular to the propagation direction of the standing wave.
  • the “standing wave generated in the housing 2” treated in this embodiment is a first-order standing wave.
  • FIG. 4 a primary standing wave SW2 generated in the housing 2 is shown.
  • acoustic particle velocity (sound pressure) is shown in black and white shading.
  • the whitest part in FIG. 4 indicates the position of the antinode of the acoustic particle velocity (node of sound pressure).
  • the frequency of the standing wave SW2 generated in the housing 2 and the primary resonance frequency of the acoustic tube 3 should be close to each other to such an extent that the resonance of the acoustic tube 3 can be effectively suppressed by the sound absorbing material 4, which will be described later. is preferred.
  • the difference between the frequency of the standing wave SW2 generated in the housing 2 and the primary resonance frequency of the acoustic tube 3 is small.
  • the difference between the frequency of the standing wave SW2 of the housing 2 and the primary resonance frequency of the acoustic tube 3 is preferably 300 Hz or less, more preferably 200 Hz or less.
  • the length L3 of the acoustic tube 3 shown in FIG. The length up to the opening end 32) may be adjusted. Specifically, for example, the tube length L3 of the acoustic tube 3 may be brought closer to the distance L2 between the first surface 21 and the second surface 22 of the housing 2.
  • the inner open end 31 of the acoustic tube 3 is arranged to face the second surface 22 of the housing 2 in the Z-axis direction (the propagation direction of the standing wave SW2 generated in the housing 2). Further, the acoustic tube 3 extends linearly from the first surface 21 of the housing 2 in the Z-axis direction.
  • a standing wave (hereinafter referred to as a "coupled standing wave”) is generated by coupling the primary resonance of the acoustic tube 3 and the standing wave SW2 of the housing 2. ) occurs.
  • the coupled standing waves may have two resonance frequencies. For example, when the resonant frequency of the primary standing wave of the housing 2 is 580 Hz and the primary resonant frequency of the acoustic tube 3 is 440 Hz, the resonant frequencies of the coupled standing wave are two, 400 Hz and 490 Hz. It may happen.
  • FIG. 3 shows an example of a coupled standing wave SWC. In FIG. 3, similarly to FIG.
  • acoustic particle velocity (sound pressure) is shown in black and white shading.
  • the whitest part in FIG. 3 indicates the position of the antinode of acoustic particle velocity (node of sound pressure) in the coupled standing wave SWC.
  • An antinode (node of sound pressure) of the acoustic particle velocity in the coupled standing wave SWC is located in a region outside the acoustic tube 3 inside the housing 2 .
  • the resonant frequency of the coupled standing wave SWC illustrated in FIG. 3 is the lower of the two resonant frequencies described above.
  • the inner open end 31 of the acoustic tube 3 is arranged at or near a node of acoustic particle velocity (antinode of sound pressure) in the standing wave SW2 generated in the housing 2.
  • the inner open end 31 of the acoustic tube 3 may be disposed, for example, near the first surface 21 or the second surface 22 of the housing 2, which is a node of acoustic particle velocity (antinode of sound pressure).
  • the inner open end 31 is located near the second surface 22 of the housing 2.
  • FIGS. 1 the inner open end 31 is located near the second surface 22 of the housing 2.
  • the inner open end 31 of the acoustic tube 3 By arranging the inner open end 31 of the acoustic tube 3 at such a position, the primary resonance of the acoustic tube 3 and the standing wave SW2 of the housing 2 are easily coupled, that is, the coupled constant wave In-wave SWC is more likely to occur.
  • the sound absorbing material 4 shown in FIG. 1 is provided to attenuate the coupled standing wave SWC.
  • the sound absorbing material 4 may be made of a material suitable for attenuating sound waves, for example, a porous material such as sponge or a highly elastic material.
  • the sound absorbing material 4 is provided inside the housing 2 in a region outside the acoustic tube 3 .
  • the sound absorbing material 4 has a wavelength of ⁇ at the resonant frequency of the coupled standing wave SWC (see FIG. 3), and the sound absorbing material 4 has a wavelength of ⁇ at the resonance frequency of the coupled standing wave SWC (see FIG. 3), and It is arranged at a position approximately ⁇ /4 away from the first surface 21.
  • the position away from the first surface 21 by ⁇ /4 corresponds to the position where the acoustic particle velocity becomes an antinode (node of sound pressure) in the coupled standing wave SWC.
  • the position away from the first surface 21 by approximately ⁇ /4 may be within a range of about ⁇ 20% of ⁇ /4, for example, centered on the position away from the first surface 21 by ⁇ /4.
  • the coupled standing wave SWC has two resonant frequencies, and in this embodiment, the sound absorbing material 4 is placed at a position corresponding to the lower resonant frequency. Note that the sound absorbing material 4 may be arranged, for example, at a position corresponding to a higher resonance frequency.
  • the sound absorbing material 4 is located between the first surface 21 and the inner open end 31 in the Z-axis direction. That is, the sound absorbing material 4 is not arranged on the side where the inner open end 31 opens in the Z-axis direction.
  • the sound absorbing material 4 of this embodiment is arranged so as to divide the space inside the housing 2 into a region on the first surface 21 side and a region on the second surface 22 side in the Z-axis direction. That is, as shown in FIG. 2, the sound absorbing material 4 is arranged over the entire circumferential direction and the entire radial direction of the acoustic tube 3 when the acoustic tube 3 is viewed from the Z-axis direction. Note that the sound absorbing material 4 does not need to divide the space inside the housing 2 into two regions, for example. In this case, the sound absorbing material 4 may be formed with a hole penetrating in the Z-axis direction, for example. Further, the sound absorbing material 4 may be formed only in a portion of the acoustic tube 3 in the circumferential direction or only in a portion of the acoustic tube 3 in the radial direction.
  • the sound absorbing material 4 is disposed inside the housing 2 at a position separated from the first surface 21 of the housing 2 by approximately ⁇ /4 wavelength.
  • ⁇ is the wavelength at the resonant frequency of the standing wave SWC generated by the coupling of the primary resonance of the acoustic tube 3 and the standing wave SW2 generated in the housing 2. Therefore, the coupled standing wave SWC can be attenuated by the sound absorbing material 4. Thereby, tube resonance (primary resonance) of the acoustic tube 3 can be suppressed.
  • the sound absorbing material 4 by arranging the sound absorbing material 4 at the above-described position, it is possible to avoid disposing the sound absorbing material 4 inside the acoustic tube 3 or near the inner open end 31 and outer open end 32 of the acoustic tube 3. can. Thereby, it is possible to prevent the sound absorbing material 4 from interfering with the bass enhancement by the sound tube 3.
  • the inner open end 31 of the acoustic tube 3 is arranged so as to face the second surface 22 of the housing 2 in the Z-axis direction (the propagation direction of the standing wave SW2 generated in the housing 2).
  • the sound absorbing material 4 is located between the first surface 21 and the inner open end 31 of the housing 2 in the Z-axis direction.
  • the acoustic tube 3 extends linearly from the first surface 21 of the housing 2 in the Z-axis direction. Therefore, the acoustic tube 3 does not cross the propagation direction of the standing wave SW2 generated in the housing 2 inside the housing 2. Therefore, it is possible to effectively prevent the standing wave SW2 generated in the housing 2 from being disturbed and changed by the portion of the acoustic tube 3 disposed inside the housing 2. Thereby, the position of the sound absorbing material 4 for suppressing tube resonance of the acoustic tube 3 can be easily set.
  • the frequency of the "standing wave generated in the housing 2" which is the object of bringing the primary resonance frequency generated in the acoustic tube 3 closer to each other is not limited to the frequency of the primary standing wave SW2, but also, for example, the frequency of the secondary standing wave SW2. It may be the frequency of Even if the "standing wave generated in the housing 2" is a secondary standing wave, if the secondary standing wave generated in the housing 2 is coupled with the primary resonance of the acoustic tube 3, the above implementation Similarly to the configuration, by arranging the sound absorbing material 4 at a position corresponding to the resonant frequency of the coupled standing wave SWC, the tube resonance of the acoustic tube 3 can be suppressed.
  • the acoustic tube 3 may be curved inside the housing 2, for example.
  • the inner surface of the casing 2 to which the acoustic tube 3 is connected is not limited to the first surface 21 and the second surface 22 that are lined up in the propagation direction of the standing wave of the casing 2; It may be a surface that intersects or is adjacent to surface 22.
  • the inner open end 31 of the acoustic tube 3 preferably faces the first surface 21 or the second surface 22 of the housing 2 in the propagation direction of the standing wave SW2 of the housing 2.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Multimedia (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)

Abstract

This acoustic apparatus 1 comprises: a housing 2; an acoustic tube 3 having an inside open end 31 that opens to the interior of the housing 2 and an outside open end 32 that opens to the exterior of the housing 2, the acoustic tube 3 having a primary resonance frequency close to the frequency of a standing wave occurring in the housing 2; and a sound-absorbing material 4 provided in a region in the interior of the housing 2 but outside of the acoustic tube 3, the sound-absorbing material 4 being disposed at a position set apart by approximately λ/4 from a first surface 21 of the housing 2 in the direction of propagation, where λ is a wavelength at a resonance frequency generated by coupling the primary resonance of the acoustic tube 3 and the standing wave occurring in the housing 2, and the direction of propagation is a direction in which the standing wave propagates in the interior of the housing 2.

Description

音響装置sound equipment
　本発明は、音響装置に関する。 The present invention relates to an audio device.
　特許文献１には、スピーカ等の音響装置として、内部に空間を有する筐体と、両端が開口し、筐体の開口部に設けられることで筐体の内部を外側に連通させる音響管（バスレフポート）と、を有する構成が開示されている。この種の音響装置では、音響管により低音域を増強した音響特性の音を放射することができる。 Patent Document 1 describes an acoustic device such as a speaker that includes a housing having a space inside, and an acoustic tube (bass reflex tube) that is open at both ends and connects the inside of the housing to the outside by being provided in the opening of the housing. A configuration having a port) is disclosed. This type of acoustic device can emit sound with acoustic characteristics that have an enhanced bass range using a sound tube.
　筐体を有する音響装置では、筐体の内部に固有周波数の音波が放射されると、当該内部には音の定在波が発生する。当該定在波は、音響装置の音響特性（音響装置から放射される音の周波数特性）に悪影響を及ぼすため、好ましくない。
　特許文献１の音響装置では、音響管の長さを、筐体の内面をなす一対の対向面間の距離に略等しくし、筐体の内部に開口する音響管の内側開口端を、一対の対向面の一方の近傍に配置している。これにより、筐体の内部に発生する音の定在波の発生を低減している。 In an acoustic device having a housing, when a sound wave having a natural frequency is radiated into the interior of the housing, a standing wave of sound is generated inside the housing. The standing waves are undesirable because they adversely affect the acoustic characteristics of the acoustic device (frequency characteristics of the sound emitted from the acoustic device).
In the acoustic device of Patent Document 1, the length of the acoustic tube is made approximately equal to the distance between a pair of opposing surfaces forming the inner surface of the housing, and the inner open end of the acoustic tube that opens inside the housing is It is placed near one of the opposing surfaces. This reduces the generation of standing waves of sound generated inside the housing.
特開２０１８－１３９４４６号公報Japanese Patent Application Publication No. 2018-139446
　ところで、筐体及び音響管を備える音響装置では、音響管の長さに応じた音響管の固有周波数において強い管共鳴（特に一次共鳴）が発生する。音響管の管共鳴は、音響装置の音響特性に悪影響を及ぼしてしまう。
　音響管の管共鳴（特に一次共鳴）を抑制するためには、例えば、音響管の内側、音響管の開口端及びその近傍に吸音材を設けることが考えられる。しかしながら、この場合には、当該吸音材によって音響管による低音域の増強（低音増強）が阻害されてしまう、という問題がある。 By the way, in an acoustic device including a housing and an acoustic tube, strong tube resonance (especially primary resonance) occurs at the natural frequency of the acoustic tube depending on the length of the acoustic tube. The tube resonance of the acoustic tube adversely affects the acoustic characteristics of the acoustic device.
In order to suppress tube resonance (particularly primary resonance) of the acoustic tube, for example, it is conceivable to provide a sound absorbing material inside the acoustic tube, at the open end of the acoustic tube, and in the vicinity thereof. However, in this case, there is a problem in that the sound absorbing material obstructs the reinforcement of the bass range (bass reinforcement) by the acoustic tube.
　本発明は、上述した事情に鑑みてなされたものであって、音響管による低音増強が阻害されることを抑制しながら、音響管の管共鳴を抑制することが可能な音響装置を提供することを目的とする。 The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide an acoustic device capable of suppressing tube resonance of an acoustic tube while suppressing inhibition of bass enhancement by the acoustic tube. With the goal.
　本発明の一態様は、筐体と、前記筐体の内部に開口する内側開口端、及び、前記筐体の外側に開口する外側開口端を有し、かつ、前記筐体に生じる定在波の周波数に近い一次共鳴周波数を有する音響管と、前記筐体の内部のうち前記音響管の外側の領域に設けられる吸音材であって、前記音響管の一次共鳴と、前記筐体に生じる定在波との連成により発生する共鳴周波数における波長をλとし、前記筐体の内部において前記定在波が伝播する方向を伝播方向として、前記伝播方向において前記筐体の第１面から略λ／４だけ離れた位置に配置された吸音材と、を備える音響装置である。 One aspect of the present invention includes a casing, an inner opening end opening into the inside of the casing, and an outer opening end opening outside the casing, and a standing wave generated in the casing. an acoustic tube having a primary resonance frequency close to a frequency of Let λ be the wavelength at the resonant frequency generated by coupling with the existing wave, and let the propagation direction be the direction in which the standing wave propagates inside the housing, and approximately λ from the first surface of the housing in the propagation direction. and a sound absorbing material placed at a distance of 1/4.
　本発明によれば、音響管による低音増強が阻害されることを抑制しながら、音響管の管共鳴を抑制することができる。 According to the present invention, it is possible to suppress the tube resonance of the acoustic tube while suppressing the obstruction of bass enhancement by the acoustic tube.
本発明の一実施形態に係る音響装置を示す断面図である。FIG. 1 is a sectional view showing an acoustic device according to an embodiment of the present invention. 図１のII－II線断面図である。2 is a sectional view taken along line II-II in FIG. 1. FIG. 図１，２の音響装置から吸音材を除いた構成において、音響管の一次共鳴と筐体に生じる定在波との連成により発生する定在波の一例を示す図である。FIG. 3 is a diagram showing an example of a standing wave generated by coupling of the primary resonance of the acoustic tube and a standing wave generated in the casing in a configuration in which the sound absorbing material is removed from the acoustic device of FIGS. 1 and 2. FIG. 図１，２の音響装置のうち筐体に生じる定在波の一例を示す図である。FIG. 3 is a diagram showing an example of standing waves generated in the housing of the acoustic device shown in FIGS. 1 and 2. FIG.
　以下、図１～４を参照して本発明の一実施形態について説明する。
　本実施形態の音響装置１は、バスレフスピーカなどのスピーカである。図１，２に示すように、音響装置１は、筐体２と、音響管３と、吸音材４と、を備える。スピーカである本実施形態の音響装置１は、不図示のスピーカユニットをさらに備える。 An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.
The audio device 1 of this embodiment is a speaker such as a bass reflex speaker. As shown in FIGS. 1 and 2, the acoustic device 1 includes a housing 2, an acoustic tube 3, and a sound absorbing material 4. The audio device 1 of this embodiment, which is a speaker, further includes a speaker unit (not shown).
　筐体２は、内部に空間を有する箱体である。筐体２の外観、及び、筐体２内の空間の具体的な形状は、任意であってよい。本実施形態において、筐体２の内部の空間は、直方体状に形成されている。また、筐体２の外観は、筐体２の内部の空間に対応する一回り大きい直方体状に形成されている。
　図面においては、筐体２の長辺が延びる方向をＺ軸方向で示している。また、長辺に直交する筐体２の１つの短辺が延びる方向をＸ軸方向で示し、長辺及び１つの短辺に直交する筐体２の別の短辺が延びる方向をＹ軸方向で示している。 The housing 2 is a box with a space inside. The appearance of the casing 2 and the specific shape of the space within the casing 2 may be arbitrary. In this embodiment, the space inside the housing 2 is formed in the shape of a rectangular parallelepiped. Further, the outer appearance of the casing 2 is formed in the shape of a rectangular parallelepiped, which is slightly larger than the space inside the casing 2.
In the drawings, the direction in which the long sides of the housing 2 extend is shown as the Z-axis direction. In addition, the direction in which one short side of the casing 2 that is perpendicular to the long side extends is shown as the X-axis direction, and the direction in which another short side of the casing 2 that is perpendicular to the long side and one short side extends is shown as the Y-axis direction. It is shown in
　スピーカユニットは、音の発生源として筐体２に設けられる。スピーカユニットにおいて発生した音は、筐体２の外側及び内側の両方に伝播する。スピーカユニットにおいて所定の周波数の音が発生することで、筐体２の内部に定在波が発生したり、音響管３の一次共鳴が発生したりする。 A speaker unit is provided in the housing 2 as a sound source. The sound generated in the speaker unit propagates to both the outside and inside of the housing 2. When sound of a predetermined frequency is generated in the speaker unit, a standing wave is generated inside the housing 2 or primary resonance of the acoustic tube 3 is generated.
　音響管３は、筐体２の内部の空間と、筐体２の外側を繋ぐ管体である。音響管３は、筐体２の内部に開口する内側開口端３１、及び、筐体２の外側に開口する外側開口端３２を有する。本実施形態において、音響管３は、筐体２の内面から筐体２の内側にのみ延びており、筐体２の外側には延びていない。このため、音響管３の内側開口端３１は筐体２の内部の空間に位置し、音響管３の外側開口端３２は筐体２の外面に位置している。なお、音響管３は、例えば筐体２の内側及び外側の両方に延びてもよい。すなわち、音響管３の外側開口端３２は、例えば筐体２の外面から外側に離れて位置してもよい。 The acoustic tube 3 is a tube that connects the space inside the housing 2 and the outside of the housing 2. The acoustic tube 3 has an inner open end 31 that opens into the interior of the housing 2 and an outer open end 32 that opens to the outside of the housing 2. In this embodiment, the acoustic tube 3 extends only from the inner surface of the casing 2 to the inside of the casing 2, and does not extend to the outside of the casing 2. Therefore, the inner open end 31 of the acoustic tube 3 is located in the space inside the housing 2, and the outer open end 32 of the acoustic tube 3 is located on the outer surface of the housing 2. Note that the acoustic tube 3 may extend, for example, both inside and outside the housing 2. That is, the outer open end 32 of the acoustic tube 3 may be located away from the outer surface of the housing 2, for example.
　音響管３に生じる一次共鳴周波数は、筐体２に生じる定在波の周波数と近い。
　ここで、「筐体２に生じる定在波」は、互いに対向する筐体２の２つの内面の一方から他方に伝播する音波と、これら２つの内面の他方から一方に伝播する音波とが重なることで、筐体２の内部に発生する。本実施形態において、筐体２に生じる定在波は、筐体２の内面であってＺ軸方向において互いに対向する筐体２の第１面２１と第２面２２との間に生じる定在波である。筐体２に生じる定在波の伝播方向は、第１面２１と第２面２２とが並ぶ方向、すなわちＺ軸方向である。筐体２の第１面２１及び第２面２２は、筐体２の内側に向く面であって、定在波の伝播方向に直交する。また、本実施形態において扱う「筐体２に生じる定在波」は、一次の定在波である。 The primary resonance frequency generated in the acoustic tube 3 is close to the frequency of the standing wave generated in the housing 2.
Here, the "standing wave generated in the casing 2" is a combination of a sound wave propagating from one of the two inner surfaces of the casing 2 facing each other to the other, and a sound wave propagating from the other of these two inner surfaces to one side. This causes the problem to occur inside the casing 2. In this embodiment, the standing wave generated in the casing 2 is a standing wave generated between the first surface 21 and the second surface 22 of the casing 2, which are the inner surfaces of the casing 2 and are opposed to each other in the Z-axis direction. It's a wave. The propagation direction of the standing wave generated in the housing 2 is the direction in which the first surface 21 and the second surface 22 are lined up, that is, the Z-axis direction. The first surface 21 and the second surface 22 of the casing 2 are surfaces facing inward of the casing 2 and are perpendicular to the propagation direction of the standing wave. Furthermore, the “standing wave generated in the housing 2” treated in this embodiment is a first-order standing wave.
　図４には、筐体２に生じる一次の定在波ＳＷ２が記載されている。図４においては、音響粒子速度（音圧）を白黒の濃淡で示している。図４では、音響粒子速度が大きい程（音圧が低い程）白くなっており、音響粒子速度が小さい程（音圧が高い程）黒くなっている。図４のうち最も白くなっている部分は、音響粒子速度の腹（音圧の節）となる位置を示している。 In FIG. 4, a primary standing wave SW2 generated in the housing 2 is shown. In FIG. 4, acoustic particle velocity (sound pressure) is shown in black and white shading. In FIG. 4, the higher the acoustic particle velocity (the lower the sound pressure), the whiter the area, and the lower the acoustic particle velocity (the higher the sound pressure), the darker the area. The whitest part in FIG. 4 indicates the position of the antinode of the acoustic particle velocity (node of sound pressure).
　そして、筐体２に生じる定在波ＳＷ２の周波数と、音響管３の一次共鳴周波数とが近い程度は、後述する吸音材４によって音響管３の管共鳴を効果的に抑制できる程度であることが好ましい。吸音材４によって音響管３の管共鳴を効果的に抑制するためには、筐体２に生じる定在波ＳＷ２の周波数と、音響管３の一次共鳴周波数との差分が小さいことがより好ましい。例えば、筐体２の定在波ＳＷ２の周波数と音響管３の一次共鳴周波数との差分は、３００Ｈｚ以下であることが好ましく、２００Ｈｚ以下であることがより好ましい。
　本実施形態において、筐体２に生じる定在波ＳＷ２の周波数と、音響管３の一次共鳴周波数とを互いに近づけるためには、図１に示す音響管３の管長Ｌ３（内側開口端３１から外側開口端３２までの長さ）を調整すればよい。具体的には、例えば、音響管３の管長Ｌ３を、筐体２の第１面２１と第２面２２との距離Ｌ２に近づければよい。 The frequency of the standing wave SW2 generated in the housing 2 and the primary resonance frequency of the acoustic tube 3 should be close to each other to such an extent that the resonance of the acoustic tube 3 can be effectively suppressed by the sound absorbing material 4, which will be described later. is preferred. In order to effectively suppress the tube resonance of the acoustic tube 3 by the sound absorbing material 4, it is more preferable that the difference between the frequency of the standing wave SW2 generated in the housing 2 and the primary resonance frequency of the acoustic tube 3 is small. For example, the difference between the frequency of the standing wave SW2 of the housing 2 and the primary resonance frequency of the acoustic tube 3 is preferably 300 Hz or less, more preferably 200 Hz or less.
In this embodiment, in order to bring the frequency of the standing wave SW2 generated in the housing 2 and the primary resonance frequency of the acoustic tube 3 closer to each other, the length L3 of the acoustic tube 3 shown in FIG. The length up to the opening end 32) may be adjusted. Specifically, for example, the tube length L3 of the acoustic tube 3 may be brought closer to the distance L2 between the first surface 21 and the second surface 22 of the housing 2.
　本実施形態において、音響管３の内側開口端３１は、Ｚ軸方向（筐体２に生じる定在波ＳＷ２の伝播方向）において筐体２の第２面２２に対向するように配置される。また、音響管３は、筐体２の第１面２１からＺ軸方向に直線状に延びている。 In this embodiment, the inner open end 31 of the acoustic tube 3 is arranged to face the second surface 22 of the housing 2 in the Z-axis direction (the propagation direction of the standing wave SW2 generated in the housing 2). Further, the acoustic tube 3 extends linearly from the first surface 21 of the housing 2 in the Z-axis direction.
　上記した筐体２及び音響管３からなる構造体では、音響管３の一次共鳴と筐体２の定在波ＳＷ２との連成による定在波（以下、「連成された定在波」と呼ぶ。）が発生する。連成された定在波の共鳴周波数は、２つとなる場合がある。例えば、筐体２の一次の定在波の共鳴周波数が５８０Ｈｚであり、音響管３の一次共鳴周波数が４４０Ｈｚであるとき、連成された定在波の共鳴周波数は、４００Ｈｚ及び４９０Ｈｚの２つとなることがある。
　図３には、連成された定在波ＳＷＣの一例が記載されている。図３においては、図４と同様に、音響粒子速度（音圧）を白黒の濃淡で示している。図３のうち最も白くなっている部分は、連成された定在波ＳＷＣにおいて、音響粒子速度の腹（音圧の節）となる位置を示している。連成された定在波ＳＷＣにおける音響粒子速度の腹（音圧の節）は、筐体２の内部のうち音響管３の外側の領域に位置している。図３に例示した連成された定在波ＳＷＣの共鳴周波数は、前述した２つの共鳴周波数のうち低い方の周波数である。 In the structure consisting of the housing 2 and the acoustic tube 3 described above, a standing wave (hereinafter referred to as a "coupled standing wave") is generated by coupling the primary resonance of the acoustic tube 3 and the standing wave SW2 of the housing 2. ) occurs. The coupled standing waves may have two resonance frequencies. For example, when the resonant frequency of the primary standing wave of the housing 2 is 580 Hz and the primary resonant frequency of the acoustic tube 3 is 440 Hz, the resonant frequencies of the coupled standing wave are two, 400 Hz and 490 Hz. It may happen.
FIG. 3 shows an example of a coupled standing wave SWC. In FIG. 3, similarly to FIG. 4, acoustic particle velocity (sound pressure) is shown in black and white shading. The whitest part in FIG. 3 indicates the position of the antinode of acoustic particle velocity (node of sound pressure) in the coupled standing wave SWC. An antinode (node of sound pressure) of the acoustic particle velocity in the coupled standing wave SWC is located in a region outside the acoustic tube 3 inside the housing 2 . The resonant frequency of the coupled standing wave SWC illustrated in FIG. 3 is the lower of the two resonant frequencies described above.
　音響管３の内側開口端３１は、筐体２に生じる定在波ＳＷ２における音響粒子速度の節（音圧の腹）となる位置あるいはその近傍に配置されることが好ましい。音響管３の内側開口端３１は、例えば、音響粒子速度の節（音圧の腹）となる筐体２の第１面２１あるいは第２面２２の近くに配置されるとよい。図１，３において、内側開口端３１は、筐体２の第２面２２の近くに配置されている。このような位置に音響管３の内側開口端３１が配置されることで、音響管３の一次共鳴と筐体２の定在波ＳＷ２とが連成しやすくなる、すなわち、連成された定在波ＳＷＣが発生しやすくなる。 It is preferable that the inner open end 31 of the acoustic tube 3 is arranged at or near a node of acoustic particle velocity (antinode of sound pressure) in the standing wave SW2 generated in the housing 2. The inner open end 31 of the acoustic tube 3 may be disposed, for example, near the first surface 21 or the second surface 22 of the housing 2, which is a node of acoustic particle velocity (antinode of sound pressure). In FIGS. 1 and 3, the inner open end 31 is located near the second surface 22 of the housing 2. In FIGS. By arranging the inner open end 31 of the acoustic tube 3 at such a position, the primary resonance of the acoustic tube 3 and the standing wave SW2 of the housing 2 are easily coupled, that is, the coupled constant wave In-wave SWC is more likely to occur.
　図１に示す吸音材４は、連成された定在波ＳＷＣを減衰させるために設けられる。吸音材４は、音波の減衰に適した材料、例えばスポンジ等のように多孔質を有していたり弾性に富んでいたりする材料によって構成されてよい。 The sound absorbing material 4 shown in FIG. 1 is provided to attenuate the coupled standing wave SWC. The sound absorbing material 4 may be made of a material suitable for attenuating sound waves, for example, a porous material such as sponge or a highly elastic material.
　吸音材４は、筐体２の内部のうち音響管３の外側の領域に設けられる。吸音材４は、連成された定在波ＳＷＣ（図３参照）の共鳴周波数における波長をλとし、Ｚ軸方向（筐体２に生じる定在波ＳＷ２の伝播方向）において筐体２の第１面２１から略λ／４だけ離れた位置に配置されている。第１面２１からλ／４だけ離れた位置は、連成された定在波ＳＷＣにおいて音響粒子速度の腹（音圧の節）となる位置に対応している。第１面２１から略λ／４だけ離れた位置は、例えば第１面２１からλ／４だけ離れた位置を中心として、λ／４の±２０％程度の範囲であってよい。
　前述したように、連成された定在波ＳＷＣには２つの共鳴周波数があるが、本実施形態において、吸音材４は低い方の共鳴周波数に対応した位置に配置される。なお、吸音材４は、例えば高い方の共鳴周波数に対応した位置に配置されてもよい。 The sound absorbing material 4 is provided inside the housing 2 in a region outside the acoustic tube 3 . The sound absorbing material 4 has a wavelength of λ at the resonant frequency of the coupled standing wave SWC (see FIG. 3), and the sound absorbing material 4 has a wavelength of λ at the resonance frequency of the coupled standing wave SWC (see FIG. 3), and It is arranged at a position approximately λ/4 away from the first surface 21. The position away from the first surface 21 by λ/4 corresponds to the position where the acoustic particle velocity becomes an antinode (node of sound pressure) in the coupled standing wave SWC. The position away from the first surface 21 by approximately λ/4 may be within a range of about ±20% of λ/4, for example, centered on the position away from the first surface 21 by λ/4.
As described above, the coupled standing wave SWC has two resonant frequencies, and in this embodiment, the sound absorbing material 4 is placed at a position corresponding to the lower resonant frequency. Note that the sound absorbing material 4 may be arranged, for example, at a position corresponding to a higher resonance frequency.
　また、吸音材４は、Ｚ軸方向において第１面２１と内側開口端３１との間に位置している。すなわち、吸音材４は、Ｚ軸方向において内側開口端３１が開口する側に配置されない。 Further, the sound absorbing material 4 is located between the first surface 21 and the inner open end 31 in the Z-axis direction. That is, the sound absorbing material 4 is not arranged on the side where the inner open end 31 opens in the Z-axis direction.
　さらに、本実施形態の吸音材４は、Ｚ軸方向において筐体２の内部の空間を第１面２１側の領域と第２面２２側の領域とに分断するように配置されている。すなわち、吸音材４は、図２に示すように音響管３をＺ軸方向から見て、音響管３の周方向全体及び径方向全体にわたって配置されている。
　なお、吸音材４は、例えば筐体２の内部の空間を２つの領域に分断しなくてもよい。この場合、吸音材４には、例えばＺ軸方向に貫通する孔が形成されてもよい。また、吸音材４は、音響管３の周方向の一部のみ、また、音響管３の径方向の一部だけに形成されてもよい。 Furthermore, the sound absorbing material 4 of this embodiment is arranged so as to divide the space inside the housing 2 into a region on the first surface 21 side and a region on the second surface 22 side in the Z-axis direction. That is, as shown in FIG. 2, the sound absorbing material 4 is arranged over the entire circumferential direction and the entire radial direction of the acoustic tube 3 when the acoustic tube 3 is viewed from the Z-axis direction.
Note that the sound absorbing material 4 does not need to divide the space inside the housing 2 into two regions, for example. In this case, the sound absorbing material 4 may be formed with a hole penetrating in the Z-axis direction, for example. Further, the sound absorbing material 4 may be formed only in a portion of the acoustic tube 3 in the circumferential direction or only in a portion of the acoustic tube 3 in the radial direction.
　以上説明したように、本実施形態の音響装置１では、吸音材４が、筐体２の内部のうち、筐体２の第１面２１から略λ／４波長だけ離れた位置に配置されている。λは、音響管３の一次共鳴と筐体２に生じる定在波ＳＷ２との連成によって発生する定在波ＳＷＣの共鳴周波数における波長である。このため、連成された定在波ＳＷＣを、当該吸音材４によって減衰させることができる。これにより、音響管３の管共鳴（一次共鳴）を抑制することができる。
　また、吸音材４が上記した位置に配置されることで、吸音材４が音響管３の内側、音響管３の内側開口端３１、外側開口端３２の近傍に配置されることを避けることができる。これにより、吸音材４が音響管３による低音増強を阻害することを抑制できる。 As explained above, in the acoustic device 1 of the present embodiment, the sound absorbing material 4 is disposed inside the housing 2 at a position separated from the first surface 21 of the housing 2 by approximately λ/4 wavelength. There is. λ is the wavelength at the resonant frequency of the standing wave SWC generated by the coupling of the primary resonance of the acoustic tube 3 and the standing wave SW2 generated in the housing 2. Therefore, the coupled standing wave SWC can be attenuated by the sound absorbing material 4. Thereby, tube resonance (primary resonance) of the acoustic tube 3 can be suppressed.
Furthermore, by arranging the sound absorbing material 4 at the above-described position, it is possible to avoid disposing the sound absorbing material 4 inside the acoustic tube 3 or near the inner open end 31 and outer open end 32 of the acoustic tube 3. can. Thereby, it is possible to prevent the sound absorbing material 4 from interfering with the bass enhancement by the sound tube 3.
　また、本実施形態の音響装置１では、音響管３の内側開口端３１がＺ軸方向（筐体２に生じる定在波ＳＷ２の伝播方向）において筐体２の第２面２２に対向するように位置する。その上で、吸音材４が、Ｚ軸方向において筐体２の第１面２１と内側開口端３１との間に位置する。これにより、吸音材４が音響管３の内側開口端３１に対向して配置されることを確実に防ぐことができる。したがって、吸音材４が音響管３による低音増強を阻害することをより効果的に抑制できる。 Moreover, in the acoustic device 1 of this embodiment, the inner open end 31 of the acoustic tube 3 is arranged so as to face the second surface 22 of the housing 2 in the Z-axis direction (the propagation direction of the standing wave SW2 generated in the housing 2). Located in Furthermore, the sound absorbing material 4 is located between the first surface 21 and the inner open end 31 of the housing 2 in the Z-axis direction. Thereby, it is possible to reliably prevent the sound absorbing material 4 from being disposed facing the inner open end 31 of the acoustic tube 3. Therefore, it is possible to more effectively suppress the sound absorbing material 4 from inhibiting the bass enhancement by the acoustic tube 3.
　また、本実施形態の音響装置１では、音響管３が、筐体２の第１面２１からＺ軸方向に直線状に延びている。このため、音響管３は、筐体２の内部において、筐体２に生じる定在波ＳＷ２の伝播方向に対して交差しない。このため、筐体２の内部に配置された音響管３の部位によって、筐体２に生じる定在波ＳＷ２が乱されて変化してしまうことを効果的に抑制できる。これにより、音響管３の管共鳴を抑制するための吸音材４の位置を簡単に設定することができる。 Furthermore, in the acoustic device 1 of this embodiment, the acoustic tube 3 extends linearly from the first surface 21 of the housing 2 in the Z-axis direction. Therefore, the acoustic tube 3 does not cross the propagation direction of the standing wave SW2 generated in the housing 2 inside the housing 2. Therefore, it is possible to effectively prevent the standing wave SW2 generated in the housing 2 from being disturbed and changed by the portion of the acoustic tube 3 disposed inside the housing 2. Thereby, the position of the sound absorbing material 4 for suppressing tube resonance of the acoustic tube 3 can be easily set.
　以上、本発明について詳細に説明したが、本発明は上記実施形態に限定されるものではなく、本発明の趣旨を逸脱しない範囲において種々の変更を加えることが可能である。 Although the present invention has been described in detail above, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention.
　本発明において、音響管３に生じる一次共鳴周波数を近づける対象である「筐体２に生じる定在波」の周波数は、一次の定在波ＳＷ２の周波数に限らず、例えば二次の定在波の周波数であってもよい。「筐体２に生じる定在波」が二次の定在波であっても、筐体２に生じる二次の定在波が音響管３の一次共鳴と連成する場合には、上記実施形態と同様に、連成された定在波ＳＷＣの共鳴周波数に対応する位置に吸音材４を配置することで、音響管３の管共鳴を抑制することができる。 In the present invention, the frequency of the "standing wave generated in the housing 2" which is the object of bringing the primary resonance frequency generated in the acoustic tube 3 closer to each other is not limited to the frequency of the primary standing wave SW2, but also, for example, the frequency of the secondary standing wave SW2. It may be the frequency of Even if the "standing wave generated in the housing 2" is a secondary standing wave, if the secondary standing wave generated in the housing 2 is coupled with the primary resonance of the acoustic tube 3, the above implementation Similarly to the configuration, by arranging the sound absorbing material 4 at a position corresponding to the resonant frequency of the coupled standing wave SWC, the tube resonance of the acoustic tube 3 can be suppressed.
　本発明において、音響管３は例えば筐体２の内部において湾曲していてもよい。この場合、音響管３が接続される筐体２の内面は、筐体２の定在波の伝播方向に並ぶ第１面２１や第２面２２に限らず、例えば第１面２１、第２面２２と交差したり隣り合ったりする面であってよい。ただし、音響管３の内側開口端３１は、筐体２の定在波ＳＷ２の伝播方向において、筐体２の第１面２１あるいは第２面２２に対向することが好ましい。 In the present invention, the acoustic tube 3 may be curved inside the housing 2, for example. In this case, the inner surface of the casing 2 to which the acoustic tube 3 is connected is not limited to the first surface 21 and the second surface 22 that are lined up in the propagation direction of the standing wave of the casing 2; It may be a surface that intersects or is adjacent to surface 22. However, the inner open end 31 of the acoustic tube 3 preferably faces the first surface 21 or the second surface 22 of the housing 2 in the propagation direction of the standing wave SW2 of the housing 2.
１…音響装置、２…筐体、２１…第１面、２２…第２面、３…音響管、３１…内側開口端、３２…外側開口端、４…吸音材 DESCRIPTION OF SYMBOLS 1...Acoustic device, 2...Housing, 21...First surface, 22...Second surface, 3...Acoustic tube, 31...Inner open end, 32...Outer open end, 4...Sound absorbing material

Claims (3)

  1. 　筐体と、
    　前記筐体の内部に開口する内側開口端、及び、前記筐体の外側に開口する外側開口端を有し、かつ、前記筐体に生じる定在波の周波数に近い一次共鳴周波数を有する音響管と、
    　前記筐体の内部のうち前記音響管の外側の領域に設けられる吸音材であって、前記音響管の一次共鳴と、前記筐体に生じる定在波との連成により発生する共鳴周波数における波長をλとし、前記筐体の内部において前記定在波が伝播する方向を伝播方向として、前記伝播方向において前記筐体の第１面から略λ／４だけ離れた位置に配置された吸音材と、
    　を備える音響装置。     A casing and
    an acoustic tube having an inner open end opening into the interior of the housing and an outer open end opening outside the housing, and having a primary resonance frequency close to the frequency of a standing wave generated in the housing; and,
    A sound absorbing material provided in a region outside the acoustic tube inside the housing, the sound absorbing material having a wavelength at a resonant frequency generated by coupling of the primary resonance of the acoustic tube and a standing wave generated in the housing. is a sound absorbing material disposed at a position approximately λ/4 away from the first surface of the housing in the propagation direction, where λ is the direction in which the standing wave propagates inside the housing. ,
    A sound device equipped with.
  2. 　前記筐体は、前記伝播方向において前記第１面に対向する第２面を有し、
    　前記内側開口端は、前記伝播方向において前記第２面に対向するように位置し、
    　前記吸音材は、前記伝播方向において前記第１面と前記内側開口端との間に位置する請求項１に記載の音響装置。     The casing has a second surface opposite to the first surface in the propagation direction,
    The inner open end is located opposite to the second surface in the propagation direction,
    The acoustic device according to claim 1, wherein the sound absorbing material is located between the first surface and the inner open end in the propagation direction.
  3. 　前記音響管は、前記筐体の内部において、前記第１面から前記伝播方向に直線状に延びている請求項１又は請求項２に記載の音響装置。 The acoustic device according to claim 1 or 2, wherein the acoustic tube extends linearly from the first surface in the propagation direction inside the housing.
PCT/JP2023/007798 2022-03-23 2023-03-02 Acoustic apparatus WO2023181832A1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5829292A (en) * 1981-08-13 1983-02-21 Matsushita Electric Ind Co Ltd Loudspeaker device
JP2009118182A (en) * 2007-11-06 2009-05-28 Sharp Corp Speaker device
JP2016025410A (en) * 2014-07-17 2016-02-08 ヤマハ株式会社 Acoustic device
JP2019186879A (en) * 2018-04-17 2019-10-24 ヤマハ株式会社 Cabinet for speaker, standing wave suppression device, and speaker system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5829292A (en) * 1981-08-13 1983-02-21 Matsushita Electric Ind Co Ltd Loudspeaker device
JP2009118182A (en) * 2007-11-06 2009-05-28 Sharp Corp Speaker device
JP2016025410A (en) * 2014-07-17 2016-02-08 ヤマハ株式会社 Acoustic device
JP2019186879A (en) * 2018-04-17 2019-10-24 ヤマハ株式会社 Cabinet for speaker, standing wave suppression device, and speaker system

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