Loudspeaker device

Abstract

A speaker device (100) is provided with a speaker unit (110) and a case (101) in which an internal space (S10) for housing the speaker unit (110) is formed, the case (101) having a shutter (102) to which the speaker unit (110) is fixed so that a diaphragm (111) of the speaker unit (110) is exposed, the shutter (102) having one or more through-holes (104) that communicate an external space (S20) outside the case (101) with the internal space (S10). The sound emitted from the plurality of through holes (104) has a wavelength having a phase opposite to that of the sound emitted directly from the diaphragm (111) to the external space (S20).

Description

Technical Field

[0001] The present disclosure relates to a speaker device. Background Art

[0002] Patent Document 1 discloses a headrest with a speaker.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application No. 2017-525456 Summary of the invention

[0006] Problems to be solved by the invention

[0007] However, in the technology of Patent Document 1, the sound reproduced from the speaker is transmitted to the vicinity of the seat provided with the headrest having the speaker. Therefore, for example, when a person sits on a seat around the seat, the person sitting on the seat around the seat can hear the sound reproduced by the speaker.

[0008] Therefore, the present disclosure provides a speaker device capable of making it difficult for a person other than a target listener to hear a reproduced sound.

[0009] Means used to solve problems

[0010] A speaker device of one embodiment of the present invention comprises: a speaker unit; and a box body, which forms an internal space for accommodating the speaker unit, the box body has a baffle, which fixes the speaker unit in a direction in which the vibration plate of the speaker unit is exposed, the baffle plate has one or more first through holes that connect the external space outside the box body with the internal space, and the sound emitted from the one or more first through holes has a wavelength in anti-phase with the sound directly emitted from the vibration plate to the external space.

[0011] Effects of the Invention

[0012] The speaker device of the present disclosure makes it difficult for people other than the target listener to hear the sound reproduced from the speaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is an external view of a chair equipped with the speaker device according to the embodiment.

[0014] Figure 2 It is a diagram showing an example of the appearance of the speaker device according to the embodiment.

[0015] Figure 3 This is a perspective view including a cross section of the speaker device according to the embodiment when cut along a plane including the central axis.

[0016] Figure 4 It is a diagram for explaining the sound reproduced from the speaker device.

[0017] Figure 5 It is a graph showing the sound pressure-frequency characteristics of the speaker devices of the comparative example and the example.

[0018] Figure 6 It is a perspective view including a cross section of the speaker device according to Modification 1 when cut along a plane including the central axis.

[0019] Figure 7 This is a graph showing the sound absorption rate of each frequency of the sound absorbing module in a specific configuration.

[0020] Figure 8 This is a diagram showing an example of the appearance of a speaker device according to Modification 2.

[0021] Fig. 9 This is a perspective view showing an example of the appearance of an acoustic lens.

[0022] Fig.10 This is a diagram of the acoustic lens viewed from the side.

[0023] Fig.11 is a cross-sectional view of an acoustic lens. DETAILED DESCRIPTION

[0024] A speaker device of the first type includes a speaker unit and a box forming an internal space for accommodating the speaker unit, the box having a baffle to which the speaker unit is fixed in a direction in which a vibration plate of the speaker unit is exposed, the baffle having one or more first through holes connecting an external space outside the box with the internal space, and sound emitted from the one or more first through holes has a wavelength in anti-phase with respect to sound directly emitted from the vibration plate to the external space.

[0025] Thus, since one or more first through holes are provided on the baffle plate to which the speaker unit is fixed, which connect the internal space of the box with the external space, the sound reproduced by the speaker unit is cancelled by the sound of the speaker unit in the opposite phase emitted from the one or more first through holes. In particular, since the low-frequency sound that is easy to bypass the speaker device is cancelled, it is possible to reduce the possibility of people around the speaker unit hearing the sound.

[0026] A speaker device according to a second aspect is the speaker device according to the first aspect, wherein the one or more first through holes are arranged in a second region of the baffle plate excluding a first region within a range of a predetermined distance from the speaker unit.

[0027] Therefore, it is possible to make it difficult for the sound emitted toward the front of the speaker unit to be cancelled, and the sound emitted from the speaker unit can be controlled so as to have directivity toward the front.

[0028] A speaker device according to a third aspect is the speaker device according to the first aspect or the second aspect, further comprising a first sound absorbing body disposed in the internal space at a position closer to the baffle than a bottom plate of the box body facing the baffle.

[0029] Therefore, the volume of the sound emitted from the one or more first through holes can be adjusted. Thus, the degree to which the sound emitted from the speaker unit is cancelled can be easily adjusted.

[0030] A fourth aspect of the speaker device is the speaker device of the third aspect, wherein the box further includes a partition plate that partitions the internal space into a first space on the baffle side and a second space on the bottom plate side and has a plurality of second through holes, and the first sound absorbing body is disposed in the first space.

[0031] Therefore, the state in which the first sound absorbing body is arranged in the first space can be maintained, and the state in which the volume of the sound emitted from the one or more first through holes is adjusted can be easily maintained.

[0032] A speaker device according to a fifth aspect is the speaker device according to the fourth aspect, further comprising a second sound absorbing body arranged in the second space.

[0033] Therefore, the volume of the sound emitted from one or more first through holes can be further adjusted.

[0034] A speaker device according to a sixth aspect is the speaker device according to any one of the first to fifth aspects, wherein the box has a third through hole disposed in a portion other than the baffle plate and communicating the external space with the internal space.

[0035] Thus, since the second through hole that connects the inner space of the box to the outer space is provided in the part of the box other than the baffle, the sound reproduced by the speaker unit is also cancelled by the opposite phase sound of the speaker unit emitted from the second through hole. In particular, since the low-frequency sound that easily bypasses the speaker is cancelled, it is possible to reduce the possibility of people around the speaker unit hearing the sound.

[0036] A speaker device according to a seventh aspect is the speaker device according to any one of the first to fifth aspects, wherein the speaker device is a sound absorbing module constituting a Helmholtz resonator.

[0037] Therefore, the speaker device can also function as a sound absorbing module.

[0038] A speaker device according to an eighth aspect is the speaker device according to any one of the first to fifth aspects, further comprising an acoustic lens disposed at a position covering the diaphragm on the outer side of the diaphragm.

[0039] Therefore, the acoustic lens can be used to control the sound on the high frequency side so that it has directivity toward the front. Thus, it is possible to control not only the directivity of the sound on the low frequency side but also the directivity of the sound on the high frequency side.

[0040] The speaker device of the ninth aspect is the speaker device of the eighth aspect, wherein the acoustic lens has: a first path facing the center of the speaker unit; and a second path arranged around the first path and shorter than the first path. Thus, high-frequency sound can be controlled to have directivity in the front.

[0041] A speaker device according to a tenth aspect is the speaker device according to the ninth aspect, wherein the acoustic lens includes: a plurality of plate-like members each having a plurality of through holes; and a support member that supports the baffle and the plurality of plate-like members in a state where they are spaced apart from each other.

[0042] Hereinafter, a speaker device according to one embodiment of the present invention will be described in detail with reference to the drawings.

[0043] In addition, the embodiments described below all represent a specific example of the present invention. The numerical values, shapes, materials, constituent elements, configuration positions and connection methods of constituent elements, steps, and the order of steps shown in the following embodiments are examples and are not intended to limit the present invention. In addition, among the constituent elements of the following embodiments, constituent elements that are not recorded in the independent claims representing the highest concept are described as arbitrary constituent elements.

[0044] (Implementation Method)

[0045] The configuration of the speaker device according to the embodiment will be described.

[0046] [1. Composition]

[0047] Figure 1 This is an external view of a chair equipped with the speaker device according to the embodiment.

[0048] like Figure 1As shown, the chair 1 includes two speaker devices 100, a headrest 10, a backrest 20, and a seat surface 30. The two speaker devices 100 are arranged on the left and right of the headrest 10. The two speaker devices 100 may also be arranged to be inclined relative to the X-axis direction so as to emit sound toward the head position of the person sitting on the chair 1 (i.e., the position in front of the headrest 10). The chair 1 is, for example, a seat arranged in a vehicle, an airplane, a ship, or other means of transportation. In addition, the chair 1 is not limited to being arranged in a seat in a room of a vehicle, but may also be a seat arranged in a movie theater, a theater, or a conference room, and may also be a chair with a cushion, a legless seat, a sofa, a massage chair, or the like. In addition, the chair 1 is configured to have two speaker devices 100, but may also be configured to have only one speaker device 100, or may be configured to have more than three speaker devices 100.

[0049] The headrest 10 is a part that supports the head of the person when the person sits on the chair 1. The backrest 20 is a part that supports the back of the person when the person sits on the chair 1. The seat surface 30 is a part that supports the thighs of the person when the person sits on the chair 1.

[0050] In the following, the front-to-back direction of the chair 1 is set as the X-axis direction, the left-to-right direction of the chair 1 is set as the Y-axis direction, and the up-down direction of the chair 1 is set as the Z-axis direction. In addition, the front side in the front-to-back direction is set as the positive side in the X-axis direction, the rear side is set as the negative side in the X-axis direction, the left side in the left-to-right direction is set as the positive side in the Y-axis direction, the right side is set as the negative side in the Y-axis direction, the upper side in the up-down direction is set as the positive side in the Z-axis direction, and the lower side is set as the negative side in the Z-axis direction.

[0051] In the following description, the above-mentioned directions are described based on the state in which the backrest 20 is not tilted rearward by the rearward inclination but is standing along the Z-axis direction.

[0052] In addition, in the present disclosure, the front side of the speaker device 100 refers to the side where the diaphragm of the speaker unit provided in the speaker device 100 is arranged, and the rear side of the speaker device 100 refers to the side where the magnetic circuit provided in the speaker unit is arranged. That is, the front of the speaker indicates the direction from the magnetic circuit provided in the speaker to the diaphragm, and the rear of the speaker indicates the direction from the diaphragm to the magnetic circuit.

[0053] Figure 2 It is a diagram showing an example of the appearance of the speaker device according to the embodiment. Figure 3 1 is a perspective view of the speaker device according to the embodiment including a cross section when cut along a plane including the central axis. Figure 3 In order to facilitate understanding of the internal structure, a part of the baffle of the speaker device and a part of the sound absorbing body are omitted in the figure.

[0054] As shown in these drawings, the speaker device 100 includes a cabinet 101 and a speaker unit 110. The speaker device 100 may further include a sound absorbing body 120 and a partition plate 105.

[0055] The box 101 is a box-shaped component having a rectangular parallelepiped shape. The box 101 has a baffle 102 arranged in the front, four side panels 101a arranged on the sides (four sides) of the speaker unit 110, and a bottom plate 101b opposite to the baffle 102 in the X-axis direction. In the box 101, an internal space S10 is formed for accommodating at least a part of the speaker unit 110 (for example, the magnetic circuit 112). The box 101 is a speaker housing. In addition, the box 101 is not limited to a rectangular parallelepiped shape, but can also be a cylindrical shape, a spherical shape, an oval shape, or other three-dimensional shapes.

[0056] The baffle 102 has an opening 103 to which the speaker unit 110 is mounted. The opening 103 is provided, for example, at the center of the baffle 102. The opening 103 may also be provided at a position deviated from the center of the baffle 102. In the opening 103 of the baffle 102, the speaker unit 110 is fixed in a direction in which the vibration plate 111 of the speaker unit 110 is exposed. The baffle 102 has a plurality of through holes 104 that connect the external space S20 on the outside of the box 101 and the internal space S10. The number of through holes 104 provided in the baffle 102 is not limited to a plurality, and may be one. The plurality of through holes 104 are arranged in a second area A2 of the baffle 102 excluding the first area A1 within a range from the speaker unit 110 to a predetermined distance d. That is, the plurality of through holes 104 are not arranged in the first area A1. In addition, the size of each of the plurality of through holes 104 may be smaller than the size of the opening 103.

[0057] The housing 101 is made of, for example, metal, resin, wood, or the like.

[0058] The speaker unit 110 includes a diaphragm 111 , a magnetic circuit 112 , and a voice coil (not shown).

[0059] The sound absorbing body 120 is arranged in the first space S11 in the internal space S10. That is, the sound absorbing body 120 is arranged at a position closer to the baffle plate 102 than the bottom plate 101b of the box body 101 which is opposite to the baffle plate 102. The sound absorbing body 120 is restricted by the partition plate 105 so as not to move from the position of the first space S11. In addition, the sound absorbing body 120 can be restricted by a member other than the partition plate 105 (for example, a protrusion provided on the side plate 101a) so as not to move from the position of the first space S11. Therefore, the speaker device 100 does not need to have the partition plate 105. The sound absorbing body 120 is an example of a first sound absorbing body.

[0060] The partition plate 105 is a plate-shaped component that divides the internal space S10 into a first space S11 on the baffle 102 side (i.e., the front side) and a second space S12 on the bottom plate 101b side (i.e., the rear side). In addition, the partition plate 105 has a plurality of through holes 106. That is, the first space S11 and the second space S12 are connected through the plurality of through holes 106 of the partition plate 105. The plurality of through holes 106 is an example of a plurality of second through holes. The size of each of the plurality of through holes 106 may be smaller than the size of the opening 103. The size of each of the plurality of through holes 106 may be the same as or different from the size of each of the plurality of through holes 104. In addition, the first space S11 and the second space S12 may also be a flat shape whose width in the X-axis direction is shorter than the width in other directions (Y-axis direction and Z-axis direction).

[0061] In the speaker device 100, since the plurality of through holes 104 are formed in the baffle plate 102 of the box 101, it also functions as a sound absorbing module constituting a Helmholtz resonator having the plurality of through holes 104 as openings and the box 101 as a container. In addition, since the plurality of through holes 106 are formed in the partition plate 105 of the box 101, the speaker device 100 constitutes a double-structured Helmholtz resonator.

[0062] [2. Effects, etc.]

[0063] The speaker device 100 of the present embodiment includes a speaker unit 110 and a cabinet 101. The cabinet 101 is formed with an internal space S10 for accommodating the speaker unit 110. The cabinet 101 has a baffle 102 to which the speaker unit 110 is fixed in a direction in which a diaphragm 111 of the speaker unit 110 is exposed. The baffle 102 has a plurality of through holes 104 that connect an external space S20 outside the cabinet 101 with the internal space S10.

[0064] Figure 4 It is a diagram for explaining the sound reproduced from the speaker device.

[0065] Thus, the baffle 102 to which the speaker unit 110 is fixed is provided with a plurality of through holes 104 that connect the internal space S10 of the box 101 with the external space S20. Therefore, the sound reproduced by the speaker unit 110 is cancelled by the sound of the speaker unit 110 in the opposite phase emitted from the plurality of through holes 104. Specifically, Figure 4As shown, the sound emitted from the speaker device 100 includes front sound emitted from the front of the vibration plate 111 of the speaker unit 110 to the front and back sound emitted from the back of the vibration plate 111 to the back and emitted from the plurality of through holes 104. Since the front sound and the back sound are in a mutually anti-phase relationship, the mutual sounds are canceled out by overlapping the front sound and the back sound. That is, the back sound emitted from the plurality of through holes 104 has a wavelength in anti-phase with the front sound directly emitted from the vibration plate 111 to the external space S20. In particular, since the sound on the low-frequency side that is easy to bypass the speaker device 100 is easy to cancel out, it is possible to reduce the situation where people around the speaker unit 110 hear the sound.

[0066] Figure 5 It is a graph showing the sound pressure-frequency characteristics of the speaker devices of the comparative example and the example.

[0067] exist Figure 5 In the figure, the solid line graph represents the sound pressure-frequency characteristics of the sound reproduced from the speaker device 100 in the space of the listening object. The space of the listening object is the space in front of the speaker device 100, and in the present embodiment, it is the space in front of the headrest 10 where the head of the person is located when the person sits on the chair 1. The solid line graph represents the sound pressure-frequency characteristics of the sound reproduced from the speaker device 100 of the present embodiment at the ear position of the person sitting on the chair 1. The dotted line graph represents the sound pressure-frequency characteristics of the sound reproduced from the speaker device 100 of the present embodiment in the space around the listening object. In addition, the space around the listening object is a space other than the space of the listening object, for example, the space behind the speaker device 100.

[0068] like Figure 5 As shown, it can be seen that the sound pressure level of the sound heard from the speaker device 100 in the space around the listening subject is suppressed in the low-frequency band compared to the sound heard by the person sitting on the chair 1 .

[0069] In the speaker device 100 of the present embodiment, the plurality of through holes 104 are arranged in the second area A2 of the baffle 102 excluding the first area A1 within the range of the predetermined distance d from the speaker unit 110 .

[0070] Therefore, it is possible to make it difficult for the sound emitted toward the front of the speaker unit 110 to be cancelled, and the sound emitted from the speaker unit 110 can be controlled so as to have directivity toward the front.

[0071] The speaker device 100 of the present embodiment further includes a sound absorbing body 120 , and the sound absorbing body 120 is disposed in the internal space S10 at a position closer to the baffle plate 102 than the bottom plate 101 b of the box 101 facing the baffle plate 102 .

[0072] Therefore, it is possible to adjust the volume of the sound emitted from the plurality of through holes 104. Thus, it is possible to easily adjust the degree to which the sound emitted from the speaker unit 110 is cancelled.

[0073] In the speaker device 100 of this embodiment, the box 101 further includes a partition plate 105 that partitions the internal space S10 into a first space S11 on the baffle 102 side and a second space S12 on the bottom plate 101b side, and is formed with a plurality of through holes 106. The sound absorbing body 120 is disposed in the first space S11.

[0074] Therefore, the state in which the sound absorbing body 120 is arranged in the first space S11 can be maintained, and the state in which the volume of the sound emitted from the plurality of through holes 104 is adjusted can be easily maintained.

[0075] The speaker device 100 of the present embodiment is a sound absorbing body constituting a Helmholtz resonator. Therefore, the speaker device 100 also functions as a sound absorbing body utilizing the action of the Helmholtz resonator.

[0076] [3. Modifications]

[0077] [3-1. Modification 1]

[0078] Figure 6 It is a perspective view including a cross section of the speaker device according to Modification 1 when cut along a plane including the central axis.

[0079] The speaker device 100A of Modification 1 is different from the speaker device 100 of the embodiment in that it further includes a sound absorbing body 121. The configuration of the speaker device 100A other than the sound absorbing body 121 is the same as that of the speaker device 100, and thus detailed description thereof will be omitted.

[0080] The sound absorbing body 121 is disposed in the second space S12 of the housing 101. That is, in the internal space S10 of the housing 101, two sound absorbing bodies 120 and 121 are disposed with the partition plate 105 interposed therebetween.

[0081] Since the two sound absorbing bodies 120 and 121 are arranged in this manner, the volume of the sound emitted from the plurality of through holes 104 can be further adjusted.

[0082] In addition, Figure 6 In the embodiment, the box 101 is configured to include a baffle 102 having a plurality of through holes 104 and a partition plate 105 having a plurality of through holes 106, and two sound absorbing bodies 120 and 121 are respectively arranged in a first space S11 and a second space S12 partitioned by the partition plate 105. That is, the combination of the box 101, the partition plate 105, and the two sound absorbing bodies 120 and 121 constitutes a sound absorbing module.

[0083] The sound absorbing module of the above structure has a Helmholtz resonator formed by the plurality of through holes 104 of the baffle 102 and the first space S1, and a Helmholtz resonator formed by the plurality of through holes 106 of the partition plate 105 and the second space S2. That is, the sound absorbing module has two Helmholtz resonators. By setting the two resonance frequencies of the two Helmholtz resonators to different values, a sound absorbing effect in a wider frequency band can be obtained.

[0084] For example, in the configuration of the sound absorbing module, if the thickness of the material forming the baffle 102 is 1 mm, the diameter of each through hole 104 is φ4 mm, the opening ratio of the plurality of through holes 104 relative to the surface area of ​​the baffle 102 is 22%, the thickness of the material of the partition 105 is 1 mm, the diameter of each through hole 106 is φ4 mm, the opening ratio of the plurality of through holes 106 relative to the surface area of ​​the partition 105 is 5%, the thickness of the first space S11 is 11 mm, the thickness of the second space S12 is 24 mm, and the sound absorbing bodies 120 and 121 are arranged so as to fill each space, the sound absorption rate of each frequency on the surface side of the baffle 102 is as follows: Figure 7 As shown in the chart. Figure 7 The thickness of the first space S11 and the second space S12 refers to the width (length) of the speaker unit 110 in the front-rear direction (X-axis direction in the figure).

[0085] like Figure 7 As shown in FIG. 1 , as a double-layer sound absorbing module, a high sound absorption rate of 0.5 or more can be obtained in the frequency band of 1kHz to 6kHz. As a result, it is possible to effectively absorb the sound around 3kHz, where the human ear is highly sensitive, and absorb the sound radiated from the speaker unit 110 to the surrounding space of the listening object, thereby suppressing the sound pressure level of unnecessary sound leakage. In addition, since the unnecessary noise transmitted from the surrounding space of the listening object is also absorbed, a quiet effect can be expected at the seated position of the person.

[0086] In addition, the frequency band in which sound absorption can be obtained can be arbitrarily designed by the material thickness of the baffle 102, the aperture of each through hole 104, the opening ratio of the plurality of through holes 104 relative to the surface area of ​​the baffle 102, and the thickness of the first space S11 and the second space S12, and is preferably set according to the noise of the environment in which the speaker device 100 is installed.

[0087] [3-2. Modification 2]

[0088] Figure 8 This is a diagram showing an example of the appearance of a speaker device according to Modification 2. Fig. 9 This is a perspective view showing an example of the appearance of an acoustic lens. Fig.10This is a diagram of the acoustic lens viewed from the side. Fig.11 This is a cross-sectional view taken near the central axis of the acoustic lens.

[0089] The speaker device 100B of Modification 2 is different from the speaker device 100 of the embodiment in that it further includes an acoustic lens 200. The configuration of the speaker device 100B other than the acoustic lens 200 is the same as that of the speaker device 100, and thus detailed description thereof will be omitted.

[0090] The acoustic lens 200 is arranged outside (ie, in front of) the diaphragm 111 of the speaker unit 110 in the speaker device 100 at a position covering the diaphragm 111. The acoustic lens 200 includes a plurality of plate-like members 210 and supporting members 220 and 221.

[0091] The plurality of plate-like components 210 each have a plurality of through holes 211. The more the plurality of plate-like components 210 are toward the positive side in the X-axis direction, the smaller the size of the outer shape is. That is, in terms of the plurality of plate-like components 210, in two adjacent plate-like components 210, the size of the outer shape of the plate-like component 210 on the positive side in the X-axis direction is smaller than the size of the outer shape of the plate-like component 210 on the negative side in the X-axis direction. The plurality of through holes 104 in the two adjacent plate-like components 210 are arranged at positions that do not overlap each other when viewed from the X-axis direction.

[0092] The support member 220 supports the plurality of plate-like members 210 in a state where they are spaced apart from each other. A portion of the support member 220 and the support member 221 support the plate-like member 210 disposed most on the negative side in the X-axis direction among the plurality of plate-like members 210 in a state where they are spaced apart from each other and the baffle 102. The acoustic lens 200 is made of, for example, metal, resin, or the like.

[0093] like Fig.11 As shown, the acoustic lens 200, through the above configuration, can make the passage distance of the sound emitted from the speaker unit 110 through the first path R1 near the center longer than the passage distance of the sound through the second path R2 around the first path R1 (outside), and lag the phase compared with the sound around the speaker unit 110 (around the center of the speaker unit 110). That is, the acoustic lens 200 has the first path R1 opposite to the center of the speaker unit 110 and the second path R2 arranged around the first path and shorter than the first path R1.

[0094] As a result, the directivity of the sound emitted from the speaker unit 110 becomes sharper toward the front, and the leakage of the sound to the surroundings can be reduced. In particular, the acoustic lens 200 can control so that the sound in the high-frequency range has directivity toward the front.

[0095] In this way, the high-frequency sound can be controlled to have directivity toward the front by the acoustic lens 200. Thus, the speaker device 100B of the second modification can control the directivity of not only the low-frequency sound but also the high-frequency sound.

[0096] In addition, in Modification 2, an acoustic lens 200 composed of a plurality of plate-like members 210 each having a plurality of through holes 211 is illustrated, but the acoustic lens is not limited to this configuration. The acoustic lens may have any configuration as long as it has a configuration that makes the passage distance of the sound emitted from the speaker unit 110 through the first path R1 near the center longer than the passage distance of the sound through the second path R2 around it. For example, the acoustic lens may be formed by overlapping plates of porous materials of different shapes, or may be formed by a block of porous materials in a conical shape with a smaller diameter at the top.

[0097] [3-3. Modification 3]

[0098] In the above-mentioned embodiment, the box 101 of the speaker device 100, 100A, 100B is configured to have a plurality of through holes 104 on the baffle 102, but the present invention is not limited thereto. For example, the box 101 may also have a second through hole that is arranged in a portion other than the baffle 102 and connects the external space S20 with the internal space S10. The second through hole may be provided in the side plate 101a of the box 101, or in the bottom plate 101b. In addition, the plurality of second through holes may also be provided in either the side plate 101a or the bottom plate 101b.

[0099] Thus, since the second through hole that connects the internal space S10 of the box 101 with the external space S20 is provided in the portion other than the baffle 102 of the box 101, the sound reproduced by the speaker unit 110 is also cancelled by the opposite-phase sound of the speaker unit 110 emitted from the second through hole. In particular, since the low-frequency sound that is likely to flow around the speaker devices 100, 100A, 100B is cancelled, it is possible to reduce the possibility of people around the speaker unit 110 hearing the sound.

[0100] In the above, a speaker device of one mode or multiple modified examples of the present disclosure is described based on the embodiment, but the present disclosure is not limited to the embodiment. As long as it does not deviate from the main purpose of the present disclosure, various modified modes that a person skilled in the art can think of for implementing the present embodiment, and modes constructed by combining constituent elements in different embodiments can also be included in the scope of one or more modes of the present disclosure.

[0101] Industrial Applicability

[0102] The present disclosure is useful as a speaker device or the like that can make it difficult for people other than the target listener to hear the sound reproduced from the speaker.

[0103] Description of Reference Numerals

[0104] 1 chair

[0105] 10 Headrest

[0106] 20 Backrest

[0107] 30 seats

[0108] 100, 100A, 100B speaker units

[0109] 101 Cabinet

[0110] 101a side panel

[0111] 101b base plate

[0112] 102 baffle

[0113] 103 opening

[0114] 104 through holes

[0115] 105 partition board

[0116] 106 through holes

[0117] 110 speaker units

[0118] 111 vibration plate

[0119] 112 Magnetic Circuit

[0120] 120, 121 sound absorbing body

[0121] 200 Acoustic Lens

[0122] 210 Plate-like parts

[0123] 211 through hole

[0124] 220, 221 support components

[0125] A1 First Area

[0126] A2 Second Area

[0127] R1 First Path

[0128] R2 Second Path

[0129] S10 Interior

[0130] S11 First Space

[0131] S12 Second Space

[0132] S20 External Space

Claims

1. A speaker device comprising: speaker unit; and The box body is formed with an internal space for accommodating the speaker unit. The box body has a baffle plate, to which the speaker unit is fixed in a direction in which the vibration plate of the speaker unit is exposed. The baffle has one or more first through holes that connect the external space outside the box with the internal space. The sound emitted from the one or more first through holes has a wavelength in reverse phase with the sound directly emitted from the diaphragm to the external space.

2. The speaker device according to claim 1, wherein The one or more first through holes are arranged in a second region of the baffle plate excluding a first region within a range of a predetermined distance from the speaker unit.

3. The speaker device according to claim 1, wherein The speaker device further includes a first sound absorbing body disposed in the internal space at a position closer to the baffle plate than a bottom plate of the box body facing the baffle plate.

4. The speaker device according to claim 3, wherein: The box body further includes a partition plate, which partitions the internal space into a first space on the baffle side and a second space on the bottom plate side, and is formed with a plurality of second through holes. The first sound absorbing body is disposed in the first space.

5. The speaker device according to claim 4, wherein The speaker device further includes a second sound absorbing body disposed in the second space.

6. The speaker device according to any one of claims 1 to 5, wherein: The housing has a third through hole that is disposed in a portion other than the baffle plate and connects the external space with the internal space.

7. The speaker device according to any one of claims 1 to 5, wherein: The speaker device is a sound absorbing module that forms a Helmholtz resonator.

8. The speaker device according to any one of claims 1 to 5, wherein: The speaker device further includes an acoustic lens disposed at a position covering the diaphragm on the outer side of the diaphragm.

9. The speaker device according to claim 8, wherein The acoustic lens has: A first path, opposite to the center of the speaker unit; as well as The second path is arranged around the first path and is shorter than the first path.

10. The speaker device according to claim 9, wherein The acoustic lens has: a plurality of plate-like components, each having a plurality of through holes; and The supporting member supports the baffle and the plurality of plate-shaped members in a state where they are spaced apart from each other.

Images