Speaker system

Abstract

To provide a speaker system which realizes a further improvement.SOLUTION: A speaker system 100B includes: a speaker unit 10 for outputting sound; a housing 20B having a front plate 21 with the speaker unit 10 attached thereto; and an acoustic tube 30B arranged in the housing 20B and having one tubular space, one end of which (an opening unit 40B) is opened and another end of which (a terminal end unit 41B) is closed. The acoustic tube 30B has a branch pipe 38B for connecting the inside of the acoustic tube 30B and the inside of the housing 20B to each other in a side wall of the acoustic tube 30B.SELECTED DRAWING: Figure 8

Description

[Technical Field]

[0001] The present disclosure relates to a speaker system. [Background technology]

[0002] Patent Document 1 discloses a speaker system that suppresses the occurrence of standing waves without reducing the sound pressure level in the low frequency range by arranging an acoustic tube inside a speaker cabinet. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2012 / 073431 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the above patent documents require further improvement. [Means for solving the problem]

[0005] A speaker system according to one aspect of the present disclosure includes a speaker unit that outputs sound, a housing having a wall surface to which the speaker unit is attached, and a speaker unit disposed inside the housing and having one end Inside the housing The acoustic tube has an open end and a closed end, and has one tubular space, and the acoustic tube has an opening formed in a side wall of the acoustic tube.

[0006] A speaker system according to one aspect of the present disclosure comprises a speaker unit that outputs sound, a housing having a wall to which the speaker unit is attached, and an acoustic tube that is disposed inside the housing and has one end open and the other end closed, the acoustic tube having an opening formed in a side wall of the acoustic tube. [Effects of the Invention]

[0007] According to the above aspect, further improvements can be achieved. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a plan view of a speaker system according to a first embodiment. [Figure 2] FIG. 2 is a cross-sectional view taken along line II-II of the speaker system shown in FIG. [Figure 3] FIG. 3 is an enlarged view of region R1 in FIG. [Figure 4] FIG. 4 is a cross-sectional view of the speaker system according to FIG. 1 taken along the line IV-IV. [Figure 5] FIG. 5 is an enlarged view showing an example of an opening formed in the side wall of the acoustic tube. [Figure 6] FIG. 6 is a diagram showing sound pressure frequency characteristics of the speaker system according to the first embodiment. [Figure 7] FIG. 7 is a plan view of the speaker system according to the second embodiment. [Figure 8] FIG. 8 is a plan view of the speaker system according to the third embodiment. [Figure 9] FIG. 9 is an enlarged view showing another example of an opening formed in the side wall of the acoustic tube. [Figure 10] FIG. 10 is an enlarged view showing another example of an opening formed in the side wall of the acoustic tube. DETAILED DESCRIPTION OF THE INVENTION

[0009] (Findings that formed the basis of this disclosure) The present inventors have found that the speaker system described in the "Background Art" section has the following problems.

[0010] In recent years, TV sets have become thinner due to thinner LCD screens and the practical application of organic electroluminescence (EL) displays, and as a result, the speaker systems installed in TV sets have also become thinner. However, in a thin speaker system, the direction in which sound travels inside the cabinet is limited by its thickness, and the influence of standing waves generated between the opposing walls of the cabinet becomes greater than in a conventional rectangular cabinet. As a result, the sound pressure frequency characteristics of the speaker system have large peaks and valleys.

[0011] A conventional technology that solves this problem is the speaker system disclosed in Patent Document 1. The conventional speaker system described in Patent Document 1 includes an acoustic tube with one open end and the other closed end inside a speaker cabinet. The acoustic tube is arranged inside the speaker cabinet so that the side wall surface of the acoustic tube intersects with the propagation direction of standing waves generated inside the speaker cabinet. With the above-described configuration, the speaker system of Patent Document 1 aims to suppress the occurrence of standing waves without reducing the sound pressure level in the low-frequency range.

[0012] However, in the above-mentioned conventional technology, the resonance effect of the acoustic tube tends to become large, which may reduce the sound pressure level in the low frequency range and cause a sound pressure dip.

[0013] Therefore, the present inventors have investigated the following measures to improve the sound pressure dip in the low frequency range.

[0014] A speaker system according to one aspect of the present disclosure comprises a speaker unit that outputs sound, a housing having a wall to which the speaker unit is attached, and an acoustic tube that is disposed inside the housing and has one end open and the other end closed, the acoustic tube having an opening formed in a side wall of the acoustic tube.

[0015] This arrangement reduces the resonance caused by the acoustic tube because an opening is formed in the side wall of the acoustic tube, which can improve the sound pressure dip in the low frequency range around the lowest resonance frequency f0 in a speaker system, thereby achieving good sound pressure frequency characteristics.

[0016] The opening may be a slit that is long in the direction in which the acoustic tube extends.

[0017] This effectively reduces the resonance caused by the acoustic tube. Furthermore, for example, by adjusting the length of the slits, the resonance caused by the acoustic tube can be easily adjusted according to the configuration of the speaker system.

[0018] The opening may be a plurality of holes arranged in the direction in which the acoustic tube extends.

[0019] Therefore, the resonance effect of the acoustic tube can be effectively alleviated while maintaining the strength of the area around the opening. Furthermore, for example, by adjusting the length of each of the multiple holes in the direction in which the acoustic tube extends or the number of multiple holes, the resonance effect of the acoustic tube can be easily adjusted according to the configuration of the speaker system.

[0020] The acoustic tube may also have a first space, a second space that is connected to the first space and is arranged on the side of the first space in a direction approximately perpendicular to the direction in which the acoustic tube extends, and a partition plate that is part of the side wall and is arranged to separate the first space and the second space in a portion excluding the connecting portion where the first space and the second space are connected, and the opening may be formed in the partition plate.

[0021] This effectively reduces the resonance caused by the acoustic tube.

[0022] The acoustic tube may further include a branch tube connected to the opening.

[0023] This effectively reduces the resonance caused by the acoustic tube.

[0024] Furthermore, a damping cloth may be provided to cover the opening.

[0025] The acoustic transducer may further include a sound absorbing material disposed inside the acoustic tube at the other end.

[0026] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.

[0027] (Embodiment 1) A speaker system according to a first embodiment of the present disclosure is shown in FIGS. 1 to 5. FIG. 1 is a plan view of the speaker system according to the first embodiment, with a portion of the surface thereof cut away. FIG. 2 is a cross-sectional view taken along the line II-II of the speaker system according to FIG. 1. FIG. 3 is an enlarged view of region R1 in FIG. 2. FIG. 4 is a cross-sectional view taken along the line IV-IV of the speaker system according to FIG. 1. FIG. 5 is an enlarged view of an opening formed in the side wall of an acoustic tube. In FIGS. 1 to 5, the front-to-rear direction of the housing 20 of the speaker system 100 is defined as the Z-axis direction, the long side direction of the rectangular housing 20 when viewed from the Z-axis direction is defined as the X-axis direction, and the short side direction of the housing 20 is defined as the Y-axis direction.

[0028] The speaker system 100 includes a speaker unit 10 and a thin rectangular parallelepiped housing 20.

[0029] The speaker unit 10 is attached to a front panel 21 of a housing 20. The speaker unit 10 is composed of a diaphragm, a magnetic circuit, and a voice coil, which are not shown.

[0030] The housing 20 is composed of a front panel 21, a back panel 22, side panels 23 and 24 arranged on both sides of the housing 20 in the X-axis direction, side panels 25 and 26 arranged on both sides of the housing 20 in the Y-axis direction, and partition panels 31 to 37 arranged inside the housing 20. The housing 20 has a first housing section 20a that forms the front side, and a second housing section 20b that forms the rear side. The housing 20 is a speaker cabinet.

[0031] The housing 20 is configured such that the side panels 23 to 26 and the partition panels 31 to 37 are separated into front and rear sections. That is, the side panels 23 to 26 and the partition panels 31 to 37 are formed by joining the front portions of the side panels 23 to 26 and the partition panels 31 to 37 formed on the first housing portion 20a with the rear portions of the side panels 23 to 26 and the partition panels 31 to 37 formed on the second housing portion 20b.

[0032] As shown in FIG. 3, for example, the partition plate 37 is formed by joining a front partition portion 37a formed on the first housing portion 20a and a rear partition portion 37b formed on the second housing portion 20b. The front partition portion 37a protrudes from the front end surface of the front partition portion 37a and has a protruding convex portion 37c formed in a ridge-like shape along the longitudinal direction of the end surface. The rear partition portion 37b has a groove-like recess 37d formed on the rear end surface of the rear partition portion 37b and fitting with the protruding portion 37c formed on the front partition portion 37a. Similar to the partition plate 37, the other partition plates 31-36 also have fitting convex portions and recesses formed thereon. Similarly to the partition plate 37, the side panels 23-26 may also have fitting convex portions and recesses formed thereon. The convex portions and recesses are not limited to the above-described protruding and groove-like shapes, as long as they are fitting with each other. For example, the convex portion may be cylindrical, and the concave portion may be a cylindrical hole. In this way, the first housing part 20a and the second housing part 20b are joined by fitting the convex portion and the concave portion together, which can improve the joining strength.

[0033] Partition plates 31 to 37 are connected to front plate 21 and rear plate 22 of housing 20. Partition plate 31 is disposed at a predetermined distance from side plate 25 and side plate 23, and is disposed approximately parallel to side plate 25. Partition plate 32 is disposed at a predetermined distance from side plate 26, and is disposed approximately parallel to side plate 26. One end of partition plate 32 is connected to side plate 23. In this way, partition plates 31 and 32 are disposed parallel to side plates 25 and 26, and have a rectangular shape that is long in the X-axis direction when viewed from the Y-axis direction. Therefore, the strength (rigidity) in the X-axis direction of housing 20, which has an internal space that is long in the X-axis direction, can be improved, and good sound pressure frequency characteristics can be obtained.

[0034] The partition plates 33 to 37 are disposed substantially parallel to the side panel 23 and are arranged side by side in the X-axis direction of the housing 20 at a predetermined distance from the side panel 23, with the side panel 23 serving as a reference. Furthermore, one end of the partition plates 33 and 35 is connected to the partition plate 31, and the other end is disposed at a predetermined distance from the partition plate 32. Furthermore, one end of the partition plates 34 and 36 is disposed at a predetermined distance from the partition plate 31, and the other end is connected to the partition plate 32. Furthermore, both ends of the partition plate 37 are connected to the partition plate 31 and the partition plate 32, respectively. Note that, in the above description, it is assumed that two connected components are connected without any gaps. In this way, the partition plates 33 to 37 are disposed parallel to the side panel 23 and have a rectangular shape that is long in the Y-axis direction when viewed from the X-axis direction. Furthermore, the partition plates 33 to 37 are disposed between the partition plates 31 and 32, spanning the Y-axis direction. This makes it possible to improve the strength (rigidity) of the housing 20 in the Y-axis direction, and to obtain good sound pressure frequency characteristics.

[0035] In this way, the interior of the housing 20 is divided by the partition plates 31-37, thereby forming an acoustic tube 30 within the housing 20. That is, in the space between the front plate 21 and the rear plate 22, the acoustic tube 30 has a first acoustic tube space A1 separated by the side plate 25 and the partition plate 31, a second acoustic tube space A2 separated by the side plate 23 and the partition plates 32 and 33, a third acoustic tube space A3 separated by the partition plates 31-34, a fourth acoustic tube space A4 separated by the partition plates 31, 32, 34, and 35, a fifth acoustic tube space A5 separated by the partition plates 31, 32, 35, and 36, and a sixth acoustic tube space A6 separated by the partition plates 31, 32, 36, and 37. Here, the front plate 21, the rear plate 22, and the partition plates 31-37 that form the acoustic tube 30 are examples of side walls of the acoustic tube 30.

[0036] The space A1 has an elongated shape that is long in the X-axis direction. The space A1 is an example of a first space. The spaces A2 to A6 have an elongated shape that is long in the Y-axis direction. The spaces A2 to A6 are examples of second spaces.

[0037] Here, the first space and the second space are separated by a partition plate 31. That is, the partition plate 31 is a part of the side wall of the acoustic tube 30 and is a component arranged to separate the first space from the second space except for the communication portion where the first space and the second space communicate with each other. Furthermore, as shown in FIG. 5 , an opening 42 is formed in the partition plate 31. The opening 42 is, for example, a slit that is elongated in the direction in which the acoustic tube 30 extends. Since the opening 42 is provided in the partition plate 31, in this embodiment, the opening 42 is a slit that is elongated in the X-axis direction. The opening 42 penetrates the partition plate 31, connecting the first space and the second space. As described above, the partition plate 31 is composed of a front partition portion 31a formed in the first housing portion 20a and a rear partition portion 31b formed in the second housing portion 20b. The opening 42 is made up of a front cutout 42a formed in the front partition 31a and a rear cutout 42b formed in the rear partition 31b. The front cutout 42a and the rear cutout 42b face each other in the Z-axis direction and together form the opening 42. Note that, although the opening 42 has been described as being made up of cutouts provided in both the front partition 31a and the rear partition 31b, the opening 42 may be made up of a cutout or a slit-shaped through-hole provided in either the front partition 31a or the rear partition 31b.

[0038] Both ends of space A1 in the longitudinal direction communicate with the space in which speaker unit 10 is disposed and space A2, respectively. Both ends of space A2 in the longitudinal direction communicate with space A1 and space A3, respectively. Both ends of space A3 in the longitudinal direction communicate with space A2 and space A4, respectively. Both ends of space A4 in the longitudinal direction communicate with space A3 and space A5, respectively. Both ends of space A5 in the longitudinal direction communicate with space A4 and space A6, respectively. One end of space A6 in the longitudinal direction communicates with space A5, and the other end of space A6 in the longitudinal direction is closed.

[0039] The acoustic tube 30 has a single tubular space formed by spaces A1 to A6 connected in series, and the tubular space is open at one end (opening 40) and closed at the other end (terminal end 41). The spaces A2 to A6 are alternately connected on either the partition plate 31 side or the partition plate 34 side, giving the acoustic tube 30 a serpentine shape.

[0040] The operation of speaker system 100 configured as described above will be explained using the sound pressure frequency characteristics in Fig. 4. When an electrical input is applied to speaker unit 10 attached to front panel 21 of housing 20, the diaphragm of speaker unit 10 vibrates and radiates sound. The sound radiated into the internal space of housing 20 is also transmitted into acoustic tube 30, which is made up of part of housing 20 and partition plates 31 to 37. Here, terminal end 41 of acoustic tube 30 is closed, so sound inside housing 20 is not radiated from acoustic tube 30 to the external space.

[0041] As described above, the first embodiment is significantly different from conventional speaker systems in that an acoustic tube 30 having an opening 42 formed in the side wall is disposed inside the housing 20. Therefore, its operation will be explained below in comparison with a conventional sealed thin speaker system.

[0042] 1 to 3, the internal dimensions of housing 20 according to embodiment 1 are 410 mm in height, 210 mm in width, and 10 mm in thickness. Furthermore, electrodynamic speaker unit 10 has a diameter of 8 cm and a thickness of 12 mm. Furthermore, partition plates 31 to 37 are 180 mm in length and spaced 30 mm apart.

[0043] The housing 20 according to the first embodiment is a rectangular parallelepiped with a thickness smaller than its length and width. For example, it is desirable to dispose the acoustic tube 30 in a housing 20 with a ratio of thickness to length (vertical direction) of 10 or more, more preferably 20 or more.

[0044] The acoustic tube 30 according to the first embodiment is arranged so as to reduce the apparent length of the longitudinal direction (in this example, the long side direction of the housing 20) inside the housing 20. In other words, the acoustic tube 30 is arranged so that the side wall (partition plate 37) of the acoustic tube 30 intersects (is perpendicular to) the propagation direction (longitudinal direction) of standing waves generated inside the housing 20. In other words, the partition plate 37 is arranged so as to intersect with the arrangement direction of the speaker unit 10 and the acoustic tube 30 in the housing 20 (the long side direction of the housing 20).

[0045] As a result, the interior of the housing 20 is acoustically divided into a space where the acoustic tube 30 exists and a rear volume A10 of the speaker unit 10. Note that the rear volume A10 of the speaker unit 10 refers to the volume of the interior space of the housing 20 excluding the space surrounded by the partition plates 31-37 (i.e., the acoustic tube 30).

[0046] As a result, sound from the speaker unit 10 is radiated into the rear volume A10 and then transmitted to the acoustic tube 30. Here, the spacing between the partition plates 31-37 is narrow at 30 mm, so from an acoustic perspective, the configuration can be considered as a long, thin acoustic tube 30 attached to the rear volume A10. More specifically, the acoustic tube 30 in embodiment 1 serves as a passageway for sound that is reflected by the partition plates 31-37, and has a total length of approximately 400 mm and a rectangular cross section, which, if considered equivalently as a circle, can be considered to have a diameter of approximately φ20 mm.

[0047] As a result, the rear volume A10 and the acoustic tube 30 coexist between the side panels 23 and 24 that face each other in the long side direction of the housing 20. This makes it possible to effectively suppress the occurrence of standing waves.

[0048] FIG. 6 is a diagram showing sound pressure frequency characteristics of the speaker system according to the first embodiment.

[0049] 1 to 3, the sound pressure frequency characteristic of a conventional sealed speaker system in which the acoustic tube 30 does not have an opening 42 is shown as characteristic 61 in FIG. 6, and the sound pressure frequency characteristic of the speaker system according to this embodiment is shown as characteristic 62 in FIG. 6. In characteristic 61, a sound pressure dip occurs between 100 and 200 Hz due to excessive resonance caused by the acoustic tube 30 of the housing 20. On the other hand, in characteristic 62, it can be seen that the sound pressure dip in characteristic 61 has been improved, resulting in a gentler sound pressure frequency characteristic.

[0050] As described above, according to the speaker system 100 of this embodiment, the openings formed in the sidewalls of the acoustic tube 30 can mitigate the resonance effect of the acoustic tube. This can improve the sound pressure dip in the low frequency range sound pressure near the lowest resonance frequency f0 in the speaker system 100, thereby achieving good sound pressure frequency characteristics.

[0051] Furthermore, in the speaker system 100 according to this embodiment, the opening 42 is a slit that is long in the direction in which the acoustic tube 30 extends. This effectively reduces the resonance effect caused by the acoustic tube 30. Furthermore, for example, by adjusting the length of the slit, the resonance effect caused by the acoustic tube 30 can be easily adjusted according to the configuration of the speaker system 100.

[0052] Furthermore, the speaker system 100 according to this embodiment can achieve a high-quality speaker system with very little disturbance in the sound pressure frequency characteristics due to standing waves generated inside the housing 20. Furthermore, because no sound-absorbing material is provided at the opening 40 of the acoustic tube 30, the sound inside the housing 20 is not damped by the sound-absorbing material, and there is no decrease in sound pressure level, particularly in the low-frequency range.

[0053] 1, a sound-absorbing material 50 may be placed at the end 41 of the acoustic tube 30. This makes it possible to more effectively suppress resonance and achieve a flat sound pressure frequency characteristic when resonance due to the acoustic tube 30 is large. In this case, the sound-absorbing material 50 is present inside the housing 20, but since the sound-absorbing material 50 is located at the closed end 41 of the acoustic tube 30, less sound passes through, and a decrease in the sound pressure level in the low-frequency range due to the sound-absorbing effect of the sound-absorbing material 50 can be suppressed. The sound-absorbing material 50 may also be made of, for example, flame-retardant inorganic fiber.

[0054] In the first embodiment, the acoustic tube 30 is provided near the side panel 23 in the long side direction of the housing 20, but it may also be provided adjacent to the side panel 24 opposite the side panel 23. In this case, since the two opposing surfaces in the long side direction are formed by the acoustic tube 30, the occurrence of standing waves can be suppressed more effectively than when it is placed on one side.

[0055] In the above example, the acoustic tube 30 is disposed in a rectangular parallelepiped housing 20 that is thin relative to its vertical and horizontal dimensions, but this is not limited thereto, and the acoustic tube may be disposed inside a columnar housing that is tall relative to its width and depth (the same applies to the following embodiments). In this case, the acoustic tube may be disposed near the top or bottom panel inside the housing so as to reduce the apparent height inside the housing.

[0056] Although the speaker system 100 of the first embodiment has been described using a sealed speaker system as an example, it may also be a bass-reflex speaker system configured by arranging an acoustic tube with one open end and the other closed end in the housing 20. The acoustic tube used in a bass-reflex speaker system has an opening formed in the side wall of the acoustic tube, similar to the acoustic tube 30 of the first embodiment.

[0057] (Embodiment 2) A speaker system according to the second embodiment will be described.

[0058] FIG. 7 is a plan view of the speaker system according to the second embodiment.

[0059] The speaker system 100A according to the second embodiment differs from the speaker system 100 according to the first embodiment in that it includes an acoustic tube 30A having a linear space.

[0060] The speaker system 100A includes a speaker unit 10 and a thin rectangular parallelepiped housing 20A. The front panel 21, rear panel 22, and side panels 23 to 26 that surround the internal space of the housing 20A are the same as those included in the housing 20 of the first embodiment, and therefore description thereof will be omitted. The housing 20A differs from the housing 20 of the first embodiment in the configuration of the partition panels 31A to 33A.

[0061] The partition plates 31A to 33A are connected to the front plate 21 and the back plate 22 of the housing 20. The partition plates 31A and 33A are arranged substantially parallel to the side plates 25 and 26. The partition plates 31A and 33A may be arranged at positions separated from the side plate 23. The partition plates 31A and 33A are arranged facing each other in the Y-axis direction with a predetermined gap between them. The partition plate 32A is arranged substantially parallel to the side plate 23, and both ends are connected to the ends of the partition plates 31A and 33A on the positive side of the X-axis, respectively. No partition plate is connected to the ends of the partition plates 31A and 33A on the negative side of the X-axis.

[0062] In this way, the interior of the housing 20A is divided by the partition plates 31A to 33A, thereby forming an acoustic tube 30A inside the housing 20A. The acoustic tube 30A is divided into an internal space A11 of the acoustic tube 30A and the remaining space A12 by the partition plates 31A to 33A in the space between the front plate 21 and the back plate 22. The acoustic tube 30A has a single linear tubular space, and one end (opening 40A) of the tubular space is open and the other end (terminal end 41A) is closed.

[0063] An opening 42A is formed in the partition plate 33A. Similar to the opening 42 described in the first embodiment, the opening 42A is a slit that is long in the direction in which the acoustic tube 30A extends (the X-axis direction).

[0064] Even in the speaker system 100A having such a configuration, the opening 42A is formed in the partition plate 33A, which is the side wall of the acoustic tube 30A, so that the resonance effect of the acoustic tube 30A can be alleviated. Therefore, even in the speaker system 100A of the second embodiment, the same effects as those of the speaker system 100 of the first embodiment can be achieved.

[0065] (Embodiment 3) A speaker system according to the third embodiment will be described.

[0066] FIG. 8 is a plan view of the speaker system according to the third embodiment.

[0067] The speaker system 100B according to the third embodiment differs from the speaker system 100A according to the second embodiment in that the acoustic tube 30B has a branch pipe 38B connected to the opening 42B.

[0068] The speaker system 100B includes a speaker unit 10 and a thin rectangular parallelepiped housing 20B. The front panel 21, rear panel 22, and side panels 23-26 that surround the internal space of the housing 20B are the same as those included in the housing 20 of the second embodiment, and therefore description thereof will be omitted. The housing 20B differs from the housing 20 of the second embodiment in the configuration of the partition panels 31B-35B.

[0069] Partition plates 31B to 35B are connected to front plate 21 and rear plate 22 of housing 20. Partition plates 31B and 33B are arranged substantially parallel to side plate 25 and 26. Partition plates 31B and 33B may be arranged at positions spaced apart from side plate 23. Partition plates 31B and 33B are arranged facing each other in the Y-axis direction with a predetermined gap between them. Partition plate 32B is arranged substantially parallel to side plate 23, and both ends are connected to the ends of partition plates 31B and 33B on the positive side of the X-axis, respectively. No partition plate is connected to the ends of partition plates 31B and 33B on the negative side of the X-axis.

[0070] An opening 42B is formed in the partition plate 33B. Partition plates 34B and 35B are connected to the portion of the partition plate 33B where the opening 42B is formed. The partition plates 34B and 35B are approximately parallel to the side panel 23. In other words, the partition plates 34B and 35B are arranged in a direction that intersects with the partition plate 33B.

[0071] In this way, by dividing the interior of the housing 20B with the partition plates 31B-35B, an acoustic tube 30B is formed inside the housing 20B, which has an internal space A21 that is elongated in the X-axis direction, similar to the acoustic tube 30A according to the second embodiment. The acoustic tube 30B also has a branch pipe 38B formed by partitioning the periphery of an opening 42B with partition plates 34B and 35B. The acoustic tube 30B is divided into an internal space A21 within the acoustic tube 30B and a space A22 outside the opening 42B by the partition plates 31B-35B in the space between the front panel 21 and the back panel 22. The acoustic tube 30B has a single linear tubular space and a space surrounded by the branch pipe 38B. The tubular space has one end (opening 40B) open and the other end (terminal end 41B) closed, and further has an opening 42B that communicates with the branch pipe 38B.

[0072] Even in the speaker system 100B having such a configuration, the opening 42B is formed in the partition plate 33B, which is the side wall of the acoustic tube 30B, so that the resonance effect of the acoustic tube 30B can be alleviated. Therefore, even in the speaker system 100B of the third embodiment, the same effects as those of the speaker system 100A of the second embodiment can be achieved.

[0073] (Other embodiments) In the first and second embodiments, the openings 42 and 42A are slits, but this is not limiting. For example, as shown in FIG. 9 , the opening 42 in the first and second embodiments may be replaced with an opening 142 formed of multiple holes aligned in the direction in which the acoustic tube 30 extends, i.e., along the long sides of the housing 20. In this case, the partition plate 131 is formed by a front partition 131a formed in the first housing portion 120a and a rear partition 131b formed in the second housing portion 120b. The opening 142 is formed by multiple front cutouts 142a formed in the front partition 131a and multiple rear cutouts 142b formed in the rear partition 131b. The multiple front cutouts 142a and the multiple rear cutouts 142b face each other in the Z-axis direction, and together they form the opening 142. Although the opening 142 has been described as being configured by providing a cutout in both the front partition 131a and the rear partition 131b, it is not limited to this and may be configured by providing a cutout in either the front partition 131a or the rear partition 131b, or by providing multiple through holes.

[0074] In the speaker systems 100, 100A, and 100B according to the first to third embodiments, a damping cloth covering the openings 42, 42A, and 42B may be arranged in the openings 42, 42A, and 42B. For example, as shown in FIG. 10, a damping cloth 70 covering the opening 42 may be arranged in the speaker system 100. The damping cloth 70 is, for example, a mesh-like cloth in which a plurality of fibers cross each other vertically and horizontally. The damping cloth 70 may be made of, for example, flame-retardant inorganic fibers.

[0075] In the speaker systems 100, 100A, and 100B according to the first to third embodiments, the partition plates 31-37, 31A-33A, and 31B-35B constituting the acoustic tube 30, 30A, and 30B are arranged substantially parallel to the side panels 25, 26 or the side panel 23. However, this is not limiting and the partition plates may be arranged at an angle relative to the side panels 25, 26 or the side panel 23. In other words, any speaker system may be used as long as it includes an acoustic tube that is arranged inside a housing, has one open end and the other closed end, and has an opening formed in the side wall of the acoustic tube. In other words, a speaker system with this configuration can achieve the effect of improving low-frequency sound pressure dips in the sound pressure frequency characteristics.

[0076] The speaker systems 100, 100A, 100B according to the first to third embodiments may be designed so that the resonance frequency determined by the inductance component of the acoustic impedance of the acoustic tubes 30, 30A, 30B and the acoustic compliance of the housings 20, 20A, 20B substantially coincides with the peak frequency of the sound pressure of the speaker unit 10 attached to the housings 20, 20A, 20B. The peak frequency at this time is higher than the minimum resonance frequency of the speaker unit 10 when not attached to the housings 20, 20A, 20B. In other words, the minimum resonance frequency f when the speaker unit 10 is attached to the housings 20, 20A, 20B is OB It may be approximately equal to

[0077] The inductance component of the acoustic impedance of the acoustic tubes 30, 30A, 30B varies depending on the length of the acoustic tubes 30, 30A, 30B (or the cross-sectional area of ​​the acoustic tubes 30, 30A, 30B). More specifically, the longer the length of the acoustic tubes 30, 30A, 30B, the larger the inductance component. Furthermore, the acoustic compliance of the housings 20, 20A, 20B varies depending on the volume of the housings 20, 20A, 20B. More specifically, the larger the volume of the housings 20, 20A, 20B, the larger the acoustic compliance.

[0078] If the inductance component of the acoustic impedance of the acoustic tubes 30, 30A, and 30B is M and the acoustic compliance of the housings 20, 20A, and 20B is C, then the resonant frequency f0 can be obtained, for example, by the following equation 1. In other words, the resonant frequency f0 can be set to any value by adjusting the length (or cross-sectional area) of the acoustic tubes 30, 30A, and 30B and the volume of the housings 20, 20A, and 20B.

[0079]

number

[0080] Furthermore, in the speaker systems 100, 100A, 100B according to the first to third embodiments, the ratio of the internal space volume of the acoustic tubes 30, 30A, 30B to the internal space volume of the housings 20, 20A, 20B may be designed to be larger as the bandwidth of the sound pressure peak of the speaker unit 10 becomes larger.

[0081] While the speaker system according to one or more aspects has been described above based on the embodiments, the present disclosure is not limited to these embodiments. As long as it does not deviate from the spirit of the present disclosure, various modifications conceivable by those skilled in the art to the present embodiments and configurations constructed by combining components of different embodiments may also be included within the scope of the present disclosure. [Industrial Applicability]

[0082] The present disclosure has a wide range of applications, particularly as speaker systems mounted on AV equipment such as televisions and audio equipment, which are becoming smaller and thinner, mobile terminal devices, and moving objects such as automobiles, trains, and airplanes. [Explanation of symbols]

[0083] 10 Speaker unit 20, 20A, 20B housing 20a, 120a First housing part 20b, 120b Second housing part 21 Front plate 22 Back plate 23~26 Side plate 30, 30A, 30B acoustic tube 31~37, 31A~33A, 31B~35B, 131 Partition 31a, 37a, 131a Front partition 31b, 37b, 131b Rear partition 37c Convex part 37d Recess 38B Branch pipe 40, 42, 40A, 42A, 40B, 42B, 142 opening 41, 41A termination 42a, 142a Front cutout 42b, 142b Rear cutout 50 Sound-absorbing material 61, 62 characteristics 70 Braking cloth 100, 100A, 100B speaker system A1~A6, A11, A12, A21, A22 Space A10 back volume

Claims

1. a speaker unit for outputting sound; a housing having a wall on which the speaker unit is attached; an acoustic tube disposed inside the housing, one end of which is open to the inside of the housing and the other end of which is closed, and which has a tubular space; The acoustic tube has a branch tube on a side wall thereof that connects the acoustic tube to the inside of the housing. Speaker system.

2. The housing comprises: The front panel and a rear plate facing the front plate; a plurality of side panels connecting the front panel and the rear panel; a partition plate disposed inside the housing, the acoustic tube and the branch pipe are formed by dividing the interior of the housing with the partition plate, The partition plate is connected to the front plate and the rear plate.

2. The speaker system according to claim 1.

3. The partition plate is disposed at a predetermined distance from one of the plurality of side plates, The partition plate is substantially parallel to the one side plate.

3. The speaker system according to claim 2.

4. The branch pipe has an opening.

4. The speaker system according to claim 1.

5. The tubular space has a serpentine shape.

5. A speaker system according to claim 1.

6. The side wall of the acoustic tube is arranged so that the side wall intersects with the propagation direction of a standing wave generated inside the housing.

6. A speaker system according to claim 1.

7. moreover, A damping cloth is provided to cover the opening.

5. The speaker system according to claim 4.

8. moreover, a sound absorbing material disposed inside the acoustic tube at the other end thereof; 8. A speaker system according to claim 1.

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