Acoustic signal output device

Abstract

Provided is an acoustic signal output device that can suppress sound leakage to the periphery thereof without hermetically sealing the external acoustic meatus. This acoustic signal output device 10 has a structure part comprising: a single or a plurality of sound holes 121a that externally release an acoustic signal AC1; and a single or a plurality of sound holes 123a that externally release an acoustic signal AC2. The sound hole 121a is located at an offset position deviating from the center axis of the structure part in a sense B1, and the sound pressure level of the acoustic signal AC2 released from the sound hole 123a into a first space is lower than the sound pressure level of the acoustic signal AC2 released from the sound hole 123a into a second space. Herein, the first space is a space that is positioned on the B1 sense side relative to the sound hole 121a, while the second space is a space that is positioned on the B2 sense side relative to the sound hole 121a. The B2 sense includes the reverse sense component to the B1 sense.

Description

[Technical Field]

[0001] The present invention relates to an acoustic signal output device, and more particularly to an acoustic signal output device that does not seal the ear canal. [Background technology]

[0002] In recent years, the increased strain on the ears caused by wearing earphones and headphones has become a problem. Open-ear earphones and headphones, which do not block the ear canal, are known as devices that reduce strain on the ears. [Prior art documents] [Non-patent literature]

[0003] [Non-Patent Document 1] “WHAT ARE OPEN-EAR HEADPHONES?” [online], Bose Corporation, [Retrieved May 16, 2022], Internet<https: / / www.bose.com / en_us / better_with_bose / open-ear-headphones.html> Summary of the Invention [Problem to be solved by the invention]

[0004] However, open-ear earphones and headphones have the problem of significant sound leakage into the surroundings. This problem is not limited to open-ear earphones and headphones, but is a common problem with any acoustic signal output device that does not seal the ear canal.

[0005] The present invention has been made in view of the above points, and has an object to provide an acoustic signal output device that does not seal the ear canal and is capable of suppressing sound leakage to the surroundings. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems, the present invention provides an acoustic signal output device having a structural part provided with one or more first sound holes for emitting a first acoustic signal to the outside and one or more second sound holes for emitting a second acoustic signal to the outside. The first sound hole is disposed at an eccentric position offset in a first direction from a central axis of the structural part, and the sound pressure level of the second acoustic signal emitted from the second sound hole into a first space is lower than the sound pressure level of the second acoustic signal emitted from the second sound hole into a second space. Here, the first space is a space located on the first direction side of the first sound hole, and the second space is a space located on the second direction side of the first sound hole, and the second direction includes a component in the opposite direction to the first direction. Furthermore, when the first acoustic signal is emitted from the first sound hole and the second acoustic signal is emitted from the second sound hole, the attenuation rate of the first acoustic signal at a second point farther from the acoustic signal output device than a predetermined first point where the first acoustic signal arrives is designed to be equal to or less than a predetermined value that is smaller than the attenuation rate of the acoustic signal due to air propagation at the second point relative to the first point, or the attenuation amount of the first acoustic signal at the second point relative to the first point is designed to be equal to or greater than a predetermined value that is greater than the attenuation amount of the acoustic signal due to air propagation at the second point relative to the first point. [Effects of the Invention]

[0007] This makes it possible to suppress sound leakage to the surroundings without sealing the ear canal. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view illustrating the configuration of an acoustic signal output device according to an embodiment. [Figure 2] 2A and 2B are transparent plan and front views illustrating the configuration of an acoustic signal output device according to an embodiment. [Figure 3] Figure 3A is an end view 2BA-2BA of Figure 2B, and Figure 3B is an end view 2A-2A of Figure 2A. [Figure 4] 4A and 4B are conceptual diagrams illustrating the arrangement of sound holes. [Figure 5] FIG. 5 is a diagram illustrating a usage state of the acoustic signal output device according to the embodiment. [Figure 6] Fig. 6A is a diagram illustrating a usage state of the acoustic signal output device of the embodiment, and Fig. 6B is a diagram illustrating observation conditions for an acoustic signal emitted from the acoustic signal output device of the embodiment. [Figure 7] FIG. 7 is a diagram illustrating the state in which the acoustic signal output device of the embodiment is placed on a plane. [Figure 8] Fig. 8A is a plan view illustrating the arrangement of the sound holes, and Figs. 8B and 8C are front views illustrating the arrangement of the sound holes. [Figure 9] 9A and 9B are conceptual diagrams illustrating the arrangement of sound holes. [Figure 10] 10A and 10B are conceptual diagrams illustrating the arrangement of sound holes. [Figure 11] Figure 11A is an end view taken along line 2A-2A of Figure 2A. Figure 11B is an end view taken along line 2A-2A of Figure 2A. [Figure 12] Fig. 12A is an end view taken along line 2A-2A of Fig. 2A, and Fig. 12B is a conceptual diagram illustrating a drive system for the acoustic signal output device according to the embodiment. [Figure 13] FIG. 13 is a graph illustrating an example of equal-loudness contours (ISO 226:2003 Acoustics - Normal equal-loudness-level contours). [Figure 14] Fig. 14A is a graph illustrating the relationship between the volume of the internal space of the housing and the resonant frequency, and Fig. 14B is a graph illustrating the sound pressure level when an LPF (Low-pass filter) is used (with LPF) and when an LPF is not used (without LPF). [Figure 15] FIG. 15 is a diagram illustrating a configuration for attaching the acoustic signal output device of the embodiment to the auricle. [Figure 16]Fig. 16 is a diagram illustrating a configuration in which an acoustic signal output device of an embodiment is provided on the temples of glasses. Fig. 16A is a front view of the acoustic signal output device of an embodiment. Fig. 16B is an enlarged transparent view of Fig. 16A. Fig. 16C is an enlarged rear view of the acoustic signal output device of an embodiment. [Figure 17] FIG. 17 is a front view illustrating a modification of the acoustic signal output device of the embodiment. [Figure 18] 18A and 18B are front views illustrating a modified example of the acoustic signal output device of the embodiment; [Figure 19] FIG. 19 is a front view illustrating a modification of the acoustic signal output device of the embodiment. [Figure 20] Fig. 20A is a plan view illustrating a modified example of the acoustic signal output device of the embodiment. Fig. 20B is a right side view illustrating a modified example of the acoustic signal output device of the embodiment. Fig. 20C is a front view illustrating a modified example of the acoustic signal output device of the embodiment. Fig. 20D is a rear view illustrating a modified example of the acoustic signal output device of the embodiment. Fig. 20E is a front view illustrating a state in which the modified example of the acoustic signal output device of the embodiment is used. [Figure 21] Fig. 21A is a perspective view illustrating a modified example of the acoustic signal output device of the embodiment, Fig. 21B is a perspective view illustrating a modified example of the acoustic signal output device of the embodiment, and Fig. 21C is a perspective view illustrating a state in which the modified example of the acoustic signal output device of the embodiment is used. [Figure 22] 22A and 22B are front and rear views illustrating a modified example of the acoustic signal output device of the embodiment. [Figure 23] 23A, 23B, and 23C are front views illustrating a modified example of the acoustic signal output device of the embodiment, a rear view illustrating the modified example of the acoustic signal output device of the embodiment, and a front view illustrating a state in which the modified example of the acoustic signal output device of the embodiment is used. [Figure 24]Fig. 24A is a plan view illustrating a modified example of the acoustic signal output device of the embodiment. Fig. 24B is a right side view illustrating a modified example of the acoustic signal output device of the embodiment. Fig. 24C is a front view illustrating a modified example of the acoustic signal output device of the embodiment. Fig. 24D is a rear view illustrating a modified example of the acoustic signal output device of the embodiment. Fig. 24E is a front view illustrating a state in which the modified example of the acoustic signal output device of the embodiment is used. [Figure 25] Fig. 25A is a plan view illustrating a modified example of the acoustic signal output device of the embodiment, Fig. 25B is a front view illustrating a modified example of the acoustic signal output device of the embodiment, Fig. 25C is a rear view illustrating a modified example of the acoustic signal output device of the embodiment, and Fig. 25D is a front view illustrating a state in which the modified example of the acoustic signal output device of the embodiment is used. [Figure 26] Fig. 26A is a plan view illustrating a modified example of the acoustic signal output device of the embodiment, Fig. 26B is a front view illustrating a modified example of the acoustic signal output device of the embodiment, Fig. 26C is a rear view illustrating a modified example of the acoustic signal output device of the embodiment, and Fig. 26D is a front view illustrating a state in which the modified example of the acoustic signal output device of the embodiment is used. [Figure 27] 27A, 27B, and 27C are left and right side views illustrating a modified example of the acoustic signal output device of the embodiment, respectively, and are front views illustrating a state in which the modified example of the acoustic signal output device of the embodiment is used. [Figure 28] Fig. 28A is a plan view illustrating a modified example of the acoustic signal output device of the embodiment. Fig. 28B is a right side view illustrating a modified example of the acoustic signal output device of the embodiment. Fig. 28C is a front view illustrating a modified example of the acoustic signal output device of the embodiment. Fig. 28D is a rear view illustrating a modified example of the acoustic signal output device of the embodiment. Fig. 28E is a front view illustrating a state in which the modified example of the acoustic signal output device of the embodiment is in use. [Figure 29]29A and 29B are conceptual diagrams illustrating a modification of the acoustic signal output device of the embodiment, and perspective views illustrating the modification of the acoustic signal output device of the embodiment. [Figure 30] 30A, 30B, and 30C are front, left, and right side views illustrating a modified example of the acoustic signal output device of the embodiment. [Figure 31] 31A, 31B, and 31C are front, left, and right side views illustrating a modified example of the acoustic signal output device of the embodiment. [Figure 32] 32A and 32B are front and rear views illustrating a modified example of the acoustic signal output device of the embodiment. [Figure 33] FIG. 33 is a conceptual diagram illustrating a modified example of the acoustic signal output device of the embodiment. [Figure 34] 34A and 34B are perspective views illustrating modifications of the acoustic signal output device of the embodiment. [Figure 35] FIG. 35 is a perspective view illustrating a modification of the acoustic signal output device of the embodiment. [Figure 36] FIG. 36 is a diagram illustrating a state in which a modified example of the acoustic signal output device according to the embodiment is worn. [Figure 37] 37A and 37B are perspective views illustrating modifications of the acoustic signal output device of the embodiment. [Figure 38] FIG. 38 is a diagram illustrating a state in which a modified example of the acoustic signal output device according to the embodiment is worn. [Figure 39] 39A and 39B are perspective views illustrating modifications of the acoustic signal output device of the embodiment. [Figure 40]40A to 40C are partially enlarged views illustrating modifications of the acoustic signal output device of the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. [First embodiment] Acoustic signal output device 10 of this embodiment is a device for listening to sound (for example, open-ear earphones, headphones, etc.) that is worn without sealing the user's ear canal. As illustrated in Figures 1, 2A, 2B, 3A, and 3B, acoustic signal output device 10 of this embodiment has a driver unit 11 that converts an output signal (an electrical signal representing an acoustic signal) output from a playback device into an acoustic signal and outputs it, a housing 12 (structural part) that houses driver unit 11 inside, and a support part 13 (structural part) that is placed on the user's auricle when worn.

[0010] <Driver unit 11> The driver unit (speaker driver unit) 11 is a device (device with speaker functionality) that emits (emits sound) an acoustic signal AC1 (first acoustic signal) based on an input output signal to one side (D1 direction), and emits an acoustic signal AC2 (second acoustic signal) that is an opposite-phase signal (phase-inverted signal) of the acoustic signal AC1 or a signal approximating the opposite-phase signal to the other side (D2 direction). That is, the acoustic signal emitted from the driver unit 11 to one side (D1 direction) will be called the acoustic signal AC1 (first acoustic signal), and the acoustic signal emitted from the driver unit 11 to the other side (D2 direction) will be called the acoustic signal AC2 (second acoustic signal). The acoustic signal AC1 is a signal that the user hears, and the acoustic signal AC2 is a signal that suppresses sound leakage to the surroundings. For example, driver unit 11 includes diaphragm 113 that emits acoustic signal AC1 in direction D1 from one surface 113a by vibration, and emits acoustic signal AC2 in direction D2 from other surface 113b by this vibration (FIG. 2B). In this example, driver unit 11 emits acoustic signal AC1 in direction D1 from one surface 111 by vibrating diaphragm 113 based on an input output signal, and emits acoustic signal AC2, which is an inverse phase signal of acoustic signal AC1 or an approximation of the inverse phase signal, from the other surface 113b. surface112 in the direction D2. In other words, acoustic signal AC2 is emitted secondarily in conjunction with the emission of acoustic signal AC1. Note that the D2 direction (other side) is, for example, the opposite direction to the D1 direction (one side), but the D2 direction does not need to be strictly the opposite direction to the D1 direction as long as the D2 direction is different from the D1 direction. The relationship between one side (D1 direction) and the other side (D2 direction) depends on the type and shape of driver unit 11. Also, depending on the type and shape of driver unit 11, acoustic signal AC2 may be a signal that is strictly the opposite phase of acoustic signal AC1, or may be a signal that is an approximation of the opposite phase signal of acoustic signal AC1. For example, the approximation signal of the opposite-phase signal of acoustic signal AC1 may be (1) a signal obtained by shifting the phase of the opposite-phase signal of acoustic signal AC1, (2) a signal obtained by changing (amplifying or attenuating) the amplitude of the opposite-phase signal of acoustic signal AC1, or (3) a signal obtained by shifting the phase of the opposite-phase signal of acoustic signal AC1 and then changing the amplitude. The phase difference between the opposite-phase signal of acoustic signal AC1 and its approximation signal is desirably δ1 (rad) or less. Examples of δ1 include π / 36, π / 12, π / 6, and π / 3. Furthermore, the ratio of the amplitude of the approximation signal to the amplitude of the opposite-phase signal of acoustic signal AC1 is desirably δ2 or less. Examples of δ2 include 0.1, 0.5, 1.0, and 2.0. For example, the amplitude of a sum signal obtained by adding acoustic signals AC1 and AC2 emitted from driver unit 11 may be smaller than the amplitude of acoustic signal AC1. For example, let Ae^jωt be the sine wave of each frequency contained in acoustic signal AC1 emitted from driver unit 11, and δ2Ae^j(-ωt+δ1) be the sine wave of each frequency contained in acoustic signal AC2 emitted from driver unit 11. Here, t represents time, ω represents angular frequency, A (A>0) represents amplitude, j represents the imaginary unit, and e represents Napier's constant. Also, δ1 represents the phase difference (rad) between the antiphase signal of acoustic signal AC1 and acoustic signal AC2, and δ2 (δ2>0) represents the amplitude ratio between the antiphase signal of acoustic signal AC1 and acoustic signal AC2. The sum signal obtained by adding both signals is as follows: (Ae^jωt)+{δ2Ae^j(-ωt+δ1)}=(1-δ2e^jδ1)Ae^jωt Since the absolute value of the amplitude of this sum signal is |(1-δ2e^jδ1)A|, in order to make the amplitude of the sum signal smaller than the amplitude of the acoustic signal AC1, it is necessary to make |(1-δ2e^jδ1)|<1. In other words, the following condition must be satisfied.

number

[0011] <Case 12> Housing 12 is a hollow member with an outer wall, and houses driver unit 11 inside. For example, driver unit 11 is fixed to the end of housing 12 on the D1 direction side. However, this does not limit the present invention. There are also no limitations on the shape of housing 12, and for example, the shape of housing 12 may be rotationally symmetric (line symmetric) or approximately rotationally symmetric about axis A1 extending along the D1 direction. Note that axis A1 is an axis that extends in the D1 direction through a central region of housing 12. For example, housing 12 has wall 121 arranged on one side (D1 direction side) of driver unit 11, wall 122 arranged on the other side (D2 direction side) of driver unit 11, and wall 123 (side surface) that surrounds the space between wall 121 and wall 122, with axis A1 passing through wall 121 and wall 122 as the center (FIGS. 2B and 3B). In this embodiment, for the sake of simplicity, an example is shown in which the housing 12 has a substantially cylindrical shape with both end faces. This is This is merely an example and does not limit the present invention. For example, the housing 12 may be a substantially dome-shaped body with walls at its ends, a hollow substantially cubic body, or any other three-dimensional shape. Furthermore, there are no limitations on the material from which the housing 12 is made. The housing 12 may be made of a rigid body such as synthetic resin or metal, or an elastic body such as rubber.

[0012] <Sound holes 121a, 123a> The wall of housing 12 is provided with sound hole 121a (first sound hole) that emits (derives) to the outside acoustic signal AC1 (first acoustic signal) emitted from driver unit 11, and sound hole 123a (second sound hole) that emits (derives) to the outside acoustic signal AC2 (second acoustic signal) emitted from driver unit 11. Sound hole 121a and sound hole 123a are, for example, through-holes that penetrate the wall of housing 12, but this does not limit the present invention. Sound hole 121a and sound hole 123a do not have to be through-holes as long as they can emit acoustic signal AC1 and acoustic signal AC2 to the outside, respectively.

[0013] Sound hole 121a (first sound hole) in this embodiment is provided in area AR1 (first area) of wall portion 121 arranged on one side of driver unit 11 (the D1 direction side, which is the side from which acoustic signal AC1 is emitted) (Figs. 2B and 3B). Sound hole 121a in this embodiment is arranged in an eccentric position shifted in the B1 direction (first direction) from axis A1 (central axis of the structural portion), and opens facing the D1 direction. The B1 direction is a specific radiation direction centered on axis A1. In this embodiment, for the sake of simplicity of explanation, Open end The edge shape of the Open end 1 shows an example in which the edge of sound hole 121a is elliptical. However, this does not limit the present invention. For example, the shape of the edge of sound hole 121a may be other shapes such as a circle, a square, or a triangle. The end of sound hole 121a may also be mesh-like. In other words, the end of sound hole 121a may be made up of multiple holes. Also, in this embodiment, for the sake of simplicity of explanation, an example is shown in which one sound hole 121a is provided in area AR1 (first area) of wall 121 of housing 12. However, this does not limit the present invention. For example, two or more sound holes 121a may be provided in area AR1 (first area) of wall 121 of housing 12.

[0014] Sound hole 123a (second sound hole) in this embodiment is provided in area AR3 of wall portion 123 that contacts area AR between area AR1 of wall portion 121 of housing 12 and area AR2 of wall portion 122 that is arranged on the D2 direction side (the other side that is the side from which acoustic signal AC2 is emitted) of driver unit 11. In other words, if the center of housing 12 is used as a reference and the direction between D1 direction and the direction opposite to D1 direction is defined as D12 direction ( FIG. 3B ), sound hole 123a (second sound hole) is provided on the D12 direction side of housing 12. For example, when housing 12 has wall portion 121 arranged on one side (D1 direction side) of driver unit 11, wall portion 122 arranged on the other side (D2 direction side) of driver unit 11, and wall portion 123 (side surface) that surrounds the space sandwiched between wall portions 121 and 122 around axis A1 along the emission direction (D1 direction) of acoustic signal AC1 that passes through wall portions 121 and 122 (Figures 2B and 3B), sound hole 123a (second sound hole) is provided in wall portion 123 (side surface).

[0015] Furthermore, sound holes 123a (second sound holes) of this embodiment are arranged biased toward the B2 direction (second direction) side. The B2 direction (second direction) is a direction that includes a component in the opposite direction of the B1 direction (first direction). For example, sound holes 123a (second sound holes) are not provided on the B1 direction (first direction) side of axis A1. As illustrated in FIGS. 4A and 4B, when sound holes 123a (second sound holes) are arranged in this manner, the total area of ​​the opening ends of sound holes 123a (second sound holes) that face space SP1 (first space) is smaller than the total area of ​​the opening ends of sound holes 123a (second sound holes) that face space SP2 (second space). As a result, the sound pressure level of acoustic signal AC2 (second acoustic signal) emitted from sound hole 123a (second sound hole) into space SP1 (first space) is lower than the sound pressure level of acoustic signal AC2 (second acoustic signal) emitted from sound hole 123a (second sound hole) into space SP2 (second space). Note that space SP1 (first space) is a space located on the B1 direction (first direction) side of sound hole 121a (first sound hole), and space SP2 (second space) is a space located on the B2 direction (second direction) side of sound hole 121a (first sound hole). In other words, it is preferable to design the device so that, for example, the farther away from the position of sound hole 121a on housing 12, the more sound holes 123a are arranged, and the closer to the position of sound hole 121a on housing 12, the fewer sound holes 123a are arranged.

[0016] It is preferable not to provide a sound hole on the wall 122 side of the housing 12. If a sound hole is provided on the wall 122 side of the housing 12, the sound pressure level of the acoustic signal AC2 emitted from the housing 12 will exceed the level necessary to cancel out the sound leakage component of the acoustic signal AC1, and this excess will be perceived as sound leakage.

[0017] <Support Section 13> 1, 2B, and 3B, the support portion 13 is a convex portion provided on the outer surface of the wall portion 121 on the D1 direction side of the housing 12. The support portion 13 has a Open end 131b is provided, and the acoustic signal AC1 emitted from the sound hole 121a is Open end 131b and released to the outside. For example, Open end Reference numeral 131b denotes a through hole, which emits the acoustic signal AC1 emitted from the sound hole 121a to the outside.

[0018] At least a portion of the outer surface region 130 of the support unit 13 has a convex shape. The outer surface region 130 is an outer surface region surrounding the open end 131b of the sound hole 121a (first sound hole), and is, for example, an annular region located on the outer surface side of the support unit 13 in the direction D1. The outer surface region 130 includes a region 131 (first region) and a region 132 (second region) that protrudes from the region 131 (first region), and is configured in a shape that guides the acoustic signal AC1 (first acoustic signal) emitted from the sound hole 121a (first sound hole) toward the region 131 (first region). In this example, the region 131 (first region) is located on the B1 direction (first direction) side of the region 132 (second region), and the outer surface region 130 guides the acoustic signal AC1 emitted from the sound hole 121a toward the B1 direction. For example, opening end 131b of sound hole 121a (first sound hole) faces space SP surrounded by area 132 (second area), and the area 131 (first area) side of space SP is open outward (outward in the direction B1) from the outer periphery of space SP. That is, for example, area 132 is a convex-shaped area in which surface 132a protrudes outward (in the direction D1) beyond surface 131a of area 131, and surrounds the area around opening end 131b except for the area 131 (first area) side (the B1 direction side). In other words, for example, area 131 is recessed more than area 132, and area 132 is curved so as to partially surround the periphery of opening end 131b of area 131. That is, in this example, region 131 is located on the B1 direction (first direction) side of open end 131b of sound hole 121a, and region 132 is a region that bulges outward from open end 131b in a 360-degree radial direction, except for a portion of the B1 direction side. For example, region 132 has a mountain shape with one or more peaks. Furthermore, surface 132a of region 132 is connected to surface 131a of region 131 via inclined portion 132c of region 132. That is, in this example, inclined portion 132c has a tapered shape that widens from surface 131a to surface 132a. In this case, acoustic signal AC1 emitted from sound hole 121a can be efficiently guided to the ear canal of a user positioned on the region 131 side (B1 direction side) when wearing acoustic signal output device 10. However, the open end 131b side of region 132 does not have to be tapered.Furthermore, the open end of sound hole 123a (second sound hole) faces the space outside the space SP surrounded by region 132 (second region). More specifically, the open end of sound hole 123a (second sound hole) in this embodiment faces the space outside the space surrounded by outer surface region 130. In addition, as described above, sound hole 123a (second sound hole) is arranged biased toward direction B2 (second direction). As a result, acoustic signal AC2 emitted from sound hole 123a is less likely to reach the user's ear canal than acoustic signal AC1 emitted from sound hole 121a.

[0019] The illustrated shape of the support section 13 is merely an example and does not limit the present invention. For example, if the surface 132a of the region 132 protrudes in the D1 direction more than the surface 131a of the region 131, the surface 131a of the region 131 and the surface 132a of the region 132 may be convex, concave, uneven, or flat. However, a curved, convex surface 132a of the region 132 provides a better fit when worn. Furthermore, there are no limitations on the material from which the support section 13 is made. The support section 13 may be made of a rigid body such as a synthetic resin, or an elastic body such as rubber or urethane. However, an elastic body from the region 132 provides a better fit when worn.

[0020] <Wearing state> 5 illustrates an example of how the acoustic signal output device 10 is worn. The acoustic signal output device 10 of this embodiment is worn on the pinna 1010 (body) of the user 1000 so that the support unit 13 faces the pinna 1010. When the housing 12 and the support unit 13 (structural unit) are attached to the pinna 1010 of the user 1000 in this manner, the region 132 (second region) of the support unit 13 is supported by contacting any part of the pinna 1010 (body), and the opening end 131b of the sound hole 121a (first sound hole) and the region 131 (first region) of the support unit 13 are not in contact with at least a part of the pinna 1010 (body), with the region 131 (first region) being positioned on the ear canal 1011 side. For example, when the acoustic signal output device 10 is worn, the area 132 is placed above the pinna 1010, and the surface 132a of the area 132 is supported by contacting the upper part of the pinna 1010 (for example, the triangular fossa or the scaphoid fossa). This prevents the sound hole 121a from coming into contact with any part of the pinna 1010 of the user 1000 and being blocked. 132 The area 1010 comes into contact with the ear and acts as a support, providing a high sense of stability when worn. 132 If is convex, the area 132The area 131 fits into the concave shape of the pinna 1010 and acts as a support, increasing stability when worn. This effect is greater when the area 131 is an elastic body than when it is a rigid body. When the acoustic signal output device 10 is worn, for example, the area 131 is located lower (closer to the ear canal 1011) than the area 132. As described above, the outer surface area 130 of the support part 13 is configured in a shape that guides the acoustic signal AC1 (first acoustic signal) emitted from the sound hole 121a (first sound hole) toward the area 131 (first area) side (toward the B1 direction). Therefore, the acoustic signal AC1 emitted from the sound hole 121a is guided toward the ear canal 1011 side (lower side of the pinna 1010) and is emitted. The area 132 supported by the pinna 1010 protrudes more than the area 131, and therefore the opening edge 131b and at least a part of the area 131 do not come into contact with the pinna 1010. Preferably, the opening end 131b and the region 131 do not come into contact with the pinna 1010. In addition, the support portion 13 does not block the ear canal 1011. This allows the acoustic signal AC1 emitted from the sound hole 121a to reach the ear canal 1011 efficiently. Furthermore, as described above, if the inclined portion 132c of the support portion 13 has a tapered shape that widens from the surface 131a to the surface 132a, the acoustic signal AC1 emitted from the sound hole 121a reaches the ear canal 1011 more efficiently. On the other hand, since the B2 direction side of the opening end 131b of the sound hole 121a is surrounded by the region 132, it is possible to suppress leakage of the acoustic signal AC1 emitted from the sound hole 121a in the B2 direction (sound leakage). In other words, when the housing 12 and the support portion 13 (structural portion) are attached to the pinna 1010 (body), , outside The sound pressure level of the acoustic signal AC1 (first acoustic signal) emitted to the ear canal 1011 side is , outside The sound pressure level is higher than the sound pressure level of the acoustic signal AC1 (first acoustic signal) emitted to a side other than the auditory canal 1011 side.

[0021] Furthermore, the open end of the sound hole 123a (second sound hole) in this embodiment faces the space outside the space SP surrounded by the region 132 (second region). The sound hole 123a (second sound hole) is also positioned biased toward the B2 direction (second direction). This makes it more difficult for the acoustic signal AC2 emitted from the sound hole 123a to reach the ear canal 1011 of the user 1000 compared to the acoustic signal AC1 emitted from the sound hole 121a. Furthermore, this acoustic signal AC2 cancels out the acoustic signal AC1 that has leaked to the outside, thereby suppressing sound leakage. This will be explained using FIGS. 6A and 6B. In the example of FIG. 6A, one acoustic signal output device 10 is attached to each of the pinna 1010 of the right ear and the pinna 1020 of the left ear of the user 1000. Any suitable attachment mechanism is used to attach the acoustic signal output device 10 to the ear. As described above, the D1 direction side of each acoustic signal output device 10 is directed toward the user 1000. The output signal output from the playback device 100 is input to the driver unit 11 of each acoustic signal output device 10, and the driver unit 11 emits an acoustic signal AC1 toward the D1 direction side and an acoustic signal AC2 toward the other side. The acoustic signal AC1 is emitted from the sound hole 121a, enters the ear canals 1011 of the right and left ears, and is heard by the user 1000. Meanwhile, the acoustic signal AC2, which is an inverse phase signal of the acoustic signal AC1 or a signal approximating the inverse phase signal, is emitted from the sound hole 123a. A portion of this acoustic signal AC2 cancels out a portion (sound leakage component) of the acoustic signal AC1 emitted from the sound hole 121a. That is, an acoustic signal AC1 (first acoustic signal) is emitted from the sound hole 121a (first sound hole) and an acoustic signal AC2 (second acoustic signal) is emitted from the sound hole 123a (second sound hole), so that the attenuation rate η of the acoustic signal AC1 (first acoustic signal) at the position P2 (second position) relative to the position P1 (first position) is 11 Set a predetermined value η th The attenuation amount η of the acoustic signal AC1 (first acoustic signal) at the position P2 (second position) based on the position P1 (first position) can be expressed as follows: 12 a predetermined value ω thHere, position P1 (first point) is a predetermined point where the acoustic signal AC1 (first acoustic signal) emitted from the sound hole 121a (first sound hole) arrives. On the other hand, position P2 (second point) is a predetermined point that is farther from the acoustic signal output device 10 than position P1 (first point). Positions P1 and P2 may be any points, but for example, positions P1 and P2 may be positions in a direction other than the B1 direction of the acoustic signal output device 10, for example, positions in the B2 direction or D2 direction of the acoustic signal output device 10. direction The predetermined value η th is the attenuation rate η of any or specific acoustic signal (sound) due to air propagation at position P2 (second position) relative to position P1 (first position). 21 In addition, the predetermined value ω th is the attenuation of any or specific acoustic signal (sound) due to air propagation at position P2 (second point) relative to position P1 (first point), η 22 That is, the acoustic signal output device 10 of this embodiment has an attenuation rate η 11 is the decay rate η 21 A predetermined value η smaller than th It is designed to be equal to or less than the attenuation η 12 is the attenuation η 22 a predetermined value ω greater than th The acoustic signal AC1 is propagated through the air from position P1 to position P2, and is attenuated due to this air propagation and the acoustic signal AC2. The attenuation rate η 11 is the ratio (AMP2(AC1) / AMP1(AC1)) of the magnitude AMP2(AC1) of the acoustic signal AC1 at the position P2 attenuated due to air propagation and the acoustic signal AC2 to the magnitude AMP1(AC1) of the acoustic signal AC1 at the position P1. Also, the attenuation amount η 12 is the difference between the magnitude AMP1(AC1) and the magnitude AMP2(AC1) (|AMP1(AC1)-AMP2(AC1)|). On the other hand, if the acoustic signal AC2 is not assumed, an arbitrary or specific acoustic signal AC propagating through the air from the position P1 to the position P2 ar is attenuated due to air propagation, not due to the acoustic signal AC2.21 is the acoustic signal AC at position P1 ar The size of AMP1 (AC ar ) at position P2, which is attenuated due to air propagation (attenuation without being attributable to acoustic signal AC2) ar Size of AMP2 (AC ar ) ratio (AMP2(AC ar ) / AMP1(AC ar )) Also, the attenuation η 22 is the magnitude AMP1(AC ar ) and size AMP2(AC ar ) and the difference (|AMP1(AC ar )-AMP2(AC ar )|). Examples of the magnitude of the acoustic signal include the sound pressure of the acoustic signal or the energy of the acoustic signal. Furthermore, the "sound leakage component" refers to, for example, a component of the acoustic signal AC1 emitted from the sound hole 121a that is likely to reach an area other than the user 1000 wearing the acoustic signal output device 10 (for example, a person other than the user 1000 wearing the acoustic signal output device 10). For example, the "sound leakage component" refers to a component of the acoustic signal AC1 that propagates in a direction other than the D1 direction. For example, the direct wave of the acoustic signal AC1 is mainly emitted from the sound hole 121a, Sound hole 123a From the Lord Sound Echo signal AC2 A direct wave of the acoustic signal AC2 emitted from the sound hole 123a is emitted. A portion of the direct wave of the acoustic signal AC1 emitted from the sound hole 121a (sound leakage component) interferes with at least a portion of the direct wave of the acoustic signal AC2 emitted from the sound hole 123a, causing them to be canceled out. However, this does not limit the present invention, and this cancellation can occur with waves other than direct waves. In other words, the sound leakage component, which is at least one of the direct wave and reflected wave of the acoustic signal AC1 emitted from the sound hole 121a, may be canceled out by at least one of the direct wave and reflected wave of the acoustic signal AC2 emitted from the sound hole 123a. This makes it possible to suppress sound leakage.

[0022] Furthermore, because sound hole 123a (second sound hole) is disposed biased toward the B2 direction (second direction) side, acoustic signal AC2 emitted from sound hole 123a is less likely to reach the ear canal 1011 side. Therefore, on the ear canal 1011 side, acoustic signal AC1 is less likely to be canceled out by acoustic signal AC2. In other words, because sound hole 123a is away from the ear canal 1011, acoustic signal AC2 emitted from sound hole 123a is less likely to cancel out acoustic signal AC1 emitted from sound hole 121a toward the ear canal 1011 side. In other words, acoustic signal AC2 can suppress sound leakage of acoustic signal AC1 leaking to places other than the ear canal 1011 side without significantly suppressing acoustic signal AC1 emitted toward the ear canal 1011 side. For example, when the acoustic signal output device 10 is attached to the auricle 1010, it is desirable that the distance from the ear canal 1011 to the sound hole 121a be 2 cm or more and 3 cm or less, and the distance from the sound hole 121a to the sound hole 123a be 2 cm or more. However, this does not limit the present invention.

[0023] <Abandoned state> As illustrated in FIG. 7 , the acoustic signal output device 10 is placed on a flat surface 1100 such as a desk. In FIG. 7 , the support unit 13 is positioned on the flat surface 1100. Even in this case, the region 132 protrudes from the region 131, so the opening end 131b of the sound hole 121a and at least a portion of the region 131 do not contact the flat surface 1100. Therefore, the acoustic signal AC1 emitted from the opening end 131b of the sound hole 121a and the acoustic signal AC2 emitted from the sound hole 123a cancel each other out as described above, thereby suppressing sound leakage. In other words, in this embodiment, the position and size of the region 132 and the shape and angle of the surface 132a of the region 132 are set so that the opening end 131b of the sound hole 121a and at least a portion of the region 131 do not contact the flat surface 1100.

[0024] Such an effect can also be obtained when the housing 12 side is placed on the flat surface 1100. That is, no matter what orientation the acoustic signal output device 10 of this embodiment is placed on the flat surface 1100, the acoustic signal AC1 emitted from the opening end 131b of the sound hole 121a and the acoustic signal AC2 emitted from the sound hole 123a cancel each other out as described above, thereby suppressing sound leakage.

[0025] [Modification of the first embodiment] The shape, size, and arrangement of sound hole 121a and sound hole 123a are not limited to those exemplified in the first embodiment. For example, the first embodiment showed an example in which one sound hole 121a is provided in area AR1 of housing 12, and open end 131b of one sound hole 121a is provided in support part 13. However, as exemplified in Fig. 8A, multiple sound holes 121a may be provided in area AR1 of housing 12, and multiple open ends 131b of sound holes 121a may be provided in support part 13. In this case, these multiple sound holes 121a and open ends 131b may be offset to eccentric positions shifted in the B1 direction from axis A1.

[0026] In the first embodiment, an example was shown in which sound holes 123a of the same shape and size were arranged on the same circumference of wall 123 of housing 12. However, as long as the open end of sound hole 123a faces the space outside space SP surrounded by region 132 and sound hole 123a is arranged biased toward the B2 direction, sound hole 123a may have any shape and size. That is, it is sufficient that the sound pressure level of acoustic signal AC2 emitted from sound hole 123a into space SP1 is lower than the sound pressure level of acoustic signal AC2 emitted from sound hole 123a into space SP2. As described above, space SP1 is a space located on the B1 direction side of sound hole 121a, and space SP2 is a space located on the B2 direction side of sound hole 121a.

[0027] For example, as illustrated in FIG. 8B, multiple sound holes 123a (second sound holes) of different sizes may be provided, or as illustrated in FIG. 8C, multiple sound holes 123a (second sound holes) of different shapes may be provided, and the multiple sound holes 123a do not have to be arranged on the same circumference.

[0028] 9A and 9B, sound holes 123a may also be provided on the B1 side of axis A1. Even in this case, it is sufficient that the opening area of ​​the sound holes 123a located on the B1 side of axis A1 is smaller than the opening area of ​​the sound holes 123a located biased toward the B2 side, or that the opening area per unit area (i.e., the density of the opening area) of the sound holes 123a located on the B1 side of axis A1 is smaller than the opening area per unit area of ​​the sound holes 123a located biased toward the B2 side. This makes the total area of ​​the opening ends of the sound holes 123a facing space SP1 smaller than the total area of ​​the opening ends of the sound holes 123a facing space SP2, and the sound pressure level of the acoustic signal AC2 emitted from the sound holes 123a into space SP1 is lower than the sound pressure level of the acoustic signal AC2 emitted from the sound holes 123a into space SP2. For example, the opening area of ​​the open end of sound hole 123a that is a distance α1 from open end 131b of sound hole 121a may be designed to be smaller than the opening area of ​​the open end of sound hole 123a that is a distance α2 from open end 131b of sound hole 121a, where α1 < α2. For example, the opening area of ​​the open end of sound hole 123a that is closer to open end 131b of sound hole 121a may be configured to be smaller.

[0029] 10A and 10B, even if sound hole 123a is provided on the B1 side of axis A1, it is sufficient that the sound pressure level of acoustic signal AC2 emitted therefrom is lower than the sound pressure level of acoustic signal AC2 emitted from sound hole 123a located biased toward the B2 side. For example, acoustic signal AC2 emitted from driver unit 11 may have directionality, so that the sound pressure level of acoustic signal AC2 emitted from sound hole 123a located on the B1 side of axis A1 is lower than the sound pressure level of acoustic signal AC2 emitted from sound hole 123a located biased toward the B2 side. Alternatively, multiple driver units 11 with different output powers may be housed inside housing 12, so that the sound pressure level of acoustic signal AC2 emitted from sound hole 123a located on the B1 side of axis A1 is lower than the sound pressure level of acoustic signal AC2 emitted from sound hole 123a located biased toward the B2 side. Alternatively, a material that attenuates acoustic signals may be placed at the opening of sound hole 123a provided on the B1 direction side of axis A1, or the opening of sound hole 123a provided on the B1 direction side of axis A1 may have a shape such as a mesh structure that attenuates acoustic signals. That is, it is sufficient if a plurality of sound holes 123a (second sound holes) are provided in housing 12, and the sound pressure level of acoustic signal AC2 (second acoustic signal) emitted from the opening end of sound hole 123a (second sound hole) that faces space SP1 (first space) is lower than the sound pressure level of acoustic signal AC2 (second acoustic signal) emitted from the opening end of sound hole 123a (second sound hole) that faces space SP2 (second space). The design may be such that the sound pressure level of acoustic signal AC2 emitted from the open end of sound hole 123a that is a distance α1 from open end 131b of sound hole 121a is smaller than the sound pressure level of acoustic signal AC2 emitted from the open end of sound hole 123a that is a distance α2 from open end 131b of sound hole 121a, where α1<α2. For example, the design may be such that the closer the sound hole 123a is to open end 131b of sound hole 121a, the smaller the sound pressure level of the emitted acoustic signal AC2.

[0030] Furthermore, in the first embodiment, an example was shown in which a plurality of sound holes 123a were provided in the housing 12, but a single sound hole 123a may be provided in the housing 12. In this case, it is desirable that the open end of sound hole 123a be as far away from sound hole 121a as possible. It is preferable that sound hole 123a be provided so that the distance between the open end of sound hole 123a and sound hole 121a is maximized.

[0031] [Second embodiment] Next, a second embodiment will be described. The second embodiment is a further modification of the first embodiment and its modifications. The following description will focus on differences from the matters described so far, and will briefly explain matters that have already been described.

[0032] The acoustic signal output device 10 illustrated in the first embodiment suppresses sound leakage by emitting an acoustic signal AC2 from the sound hole 123a, thereby canceling out the acoustic signal AC1 that was emitted from the sound hole 121a and leaked to the outside. Ideally, this is based on the acoustic signal AC2 being out of phase with the acoustic signal AC1. However, because the propagation paths of the acoustic signals AC1 and AC2 are different, a phase difference occurs between the acoustic signals AC1 and AC2, and the acoustic signal AC2 may not be out of phase with the acoustic signal AC1 at the position where sound leakage is desired to be suppressed. This effect becomes more pronounced as the frequencies of the acoustic signals AC1 and AC2 increase, making it difficult to suppress sound leakage as the frequencies increase. In some cases, the acoustic signal AC2 does not cancel out the acoustic signal AC1, and instead the acoustic signal AC2 is perceived as a sound leakage component. For example, the acoustic signal AC2 can suppress sound leakage of the acoustic signal AC1 only when the frequencies of the acoustic signals AC1 and AC2 are up to about 3 kHz. At frequencies above this, the acoustic signal AC2 also becomes a sound leakage component.

[0033] Furthermore, the human ear is sensitive to the 3 kHz to 6 kHz band, and perceives even softer sounds in this band as louder than in other bands. This human hearing characteristic is expressed as an equal loudness curve. This equal loudness curve plots the sound pressure levels at which sounds of various frequencies are perceived as having the same loudness. Figure 13 shows the equal loudness curves. The horizontal axis of Figure 13 represents frequency [Hz], and the vertical axis represents sound pressure level [dB]. As shown in Figure 13, the equal loudness curves have a minimum around 4 kHz, indicating that human hearing sensitivity is high at this frequency. Therefore, it is desirable to lower the sound pressure level of the acoustic signal AC2 in the 3 kHz to 6 kHz band, where human hearing sensitivity is high.

[0034] As mentioned above, the acoustic signal AC2 emitted from the driver unit 11 is emitted into the area AR, which is the internal space of the housing 12 (enclosure), and is then emitted to the outside from the sound hole 123a, and the sound pressure level of the acoustic signal AC2 reaches a maximum at the resonance frequency of this area AR. Therefore, in order to suppress sound leakage on the high frequency side, it is desirable to set this resonance frequency to a band above which the human hearing sensitivity is high (for example, 6 kHz or higher). Figure 14A illustrates the relationship between the volume of the area AR and the acoustic signal AC2 emitted to the outside from the sound hole 123a. As illustrated in Figure 14A, Accumulation Therefore, by reducing the volume of the area AR, the resonant frequency of the area AR is set to a frequency band above the high sensitivity of human hearing (for example, 6 kHz or above). and This is thought to reduce the effect of sound leakage.

[0035] However, if the resonant frequency of the area AR is set to be higher than the band where human hearing sensitivity is high, the sound pressure level will also increase in the band around this resonant frequency, and the sound pressure level in the band where human hearing sensitivity is high will also increase. Therefore, in this embodiment, a further measure is taken to reduce the high-frequency side of the acoustic signal AC2 emitted to the outside from the sound hole 123a. This makes it possible to reduce sound leakage in the band where human hearing sensitivity is high (for example, the band of 3 kHz to 6 kHz).

[0036] Acoustic signal output device 20 of this embodiment has a driver unit 11, a housing 12 (structural part) that houses driver unit 11 inside, and a support part 13 (structural part) that is placed on the user's auricle when worn. Housing 12 (structural part) is provided with one or more sound holes 121a (first sound holes) that emit an acoustic signal AC1 (first acoustic signal) to the outside, a hollow part that emits an acoustic signal AC2 (second acoustic signal) into an area AR (internal space), and one or more sound holes 123a (second sound holes) that emit the acoustic signal AC2 (second acoustic signal) emitted into the area AR (internal space) of the hollow part to the outside. Here, the hollow portion is designed so that its resonant frequency is equal to or higher than a predetermined frequency (for example, equal to or higher than the band where human hearing sensitivity is high, for example, 6 kHz or higher), and the acoustic signal AC2 (second acoustic signal) is designed so that frequency band components including the predetermined frequency (for example, band components where human hearing sensitivity is high, for example, band components between 3 kHz and 6 kHz) are suppressed and emitted to the outside from the sound hole 123a (second sound hole). This makes it possible to reduce sound leakage in the band where human hearing sensitivity is high (for example, the band between 3 kHz and 6 kHz). An example of such a design is shown below.

[0037] <Design example 1> As illustrated in FIG. 11A , the housing 12 (structural section) of the acoustic signal output device 20 may have an internal hollow section 241 disposed in an area AR (internal space) of the hollow section 220. The internal space ISP of the internal hollow section 241 is spatially separated from the area AR (internal space) of the hollow section 220 located outside the internal hollow section 241. That is, the internal hollow section 241 is a hollow member having a wall section 242 on the outside, and the internal space ISP is spatially separated from the area AR by the wall section 242. As long as the internal hollow section 241 has such an internal space ISP, the shape of the internal hollow section 241 may be any shape. There is no limitation on the material constituting the wall section 242. The wall section 242 may be made of a rigid body such as synthetic resin or metal, or may be made of an elastic body such as rubber. Furthermore, the internal space ISP of the internal hollow section 241 may be completely sealed or may not be completely sealed as long as it is spatially separated from the area AR. The internal space ISP may be filled with air or other gas, and may further include a material such as an elastic body. However, it is desirable that the material disposed in the internal space ISP be softer than the wall 242. In this example, the bottom surface 242a of the wall 242 of the internal hollow portion 241 is fixed to the region AR2 inside the hollow portion 220. However, this is just an example, and any region of the wall 242 of the internal hollow portion 241 may be fixed to any region inside the hollow portion 220. The internal hollow portion 241 is fixed to the region AR of the hollow portion 220. of By arranging the hollow portion 220 and the internal hollow portion 241 to form a double structure, the volume of the region AR can be reduced and the resonant frequency of the hollow portion 220 can be increased. Therefore, by appropriately designing the volume of the internal hollow portion 241, the resonant frequency of the hollow portion 220 can be set to a frequency band above the high human hearing sensitivity (for example, 6 kHz or higher). In particular, the internal hollow portion 241 has a high degree of freedom in design, and the shape and size of the internal hollow portion 241 can be set so that the volume of the region AR is sufficiently small. doFor example, it is possible to design internal hollow portion 241 so that it does not come into contact with driver unit 11 and is as close as possible to driver unit 11, thereby making it possible to sufficiently increase the resonance frequency of hollow portion 220. Furthermore, the air or the like in the internal space ISP of internal hollow portion 241 acts as a damper to reduce vibrations in hollow portion 220, making it possible to suppress the high-frequency band components of acoustic signal AC2 (second acoustic signal) emitted to the outside from sound hole 123a (second sound hole).

[0038] <Design example 2> 11B , cushioning material 25 may be disposed between bottom surface 242a (outside) of internal hollow portion 241 and region AR2 (inside) of hollow portion 220, and bottom surface 242a (outside) of internal hollow portion 241 may be fixed to region AR2 (inside) of hollow portion 220 via cushioning material 25. Note that in this example, cushioning material 25 is disposed on bottom surface 242a of internal hollow portion 241, but cushioning material 25 may be disposed between other wall portions 242 of internal hollow portion 241 and the inside of hollow portion 220, and other wall portions 242 of internal hollow portion 241 may be fixed to the inside of hollow portion 220 via cushioning material 25. Cushioning material 25 is softer than wall portions 122 of housing 12 and wall portions 242 of internal hollow portion 241, thereby further reducing vibrations in hollow portion 220. This makes it possible to suppress the high-frequency band components of the acoustic signal AC2 emitted to the outside from the sound hole 123a. Examples of materials for the buffer material 25 include paper, urethane, and rubber, and for example, double-sided tape made of paper may be used as the buffer material 25. However, this does not limit the present invention. Furthermore, if such a buffer material 25 is provided, a filled solid member may be used instead of the internal hollow portion 241.

[0039] <Design example 3> 12A, at least a portion of the electronic components 26 for driving the driver unit 11 may be housed in the internal space IS P of the internal hollow portion 241. This allows the internal space IS P , which acts as a damper, to be accommodated in the internal space IS P , which acts as a damper. PThis space can be used as an arrangement space for electronic components 26, thereby enabling the size of housing 12 to be reduced. Examples of electronic components 26 include wiring cables, electronic components, and electronic circuit boards. Considering the function as a damper, electronic components 26 are desirably made of a material softer than wall portion 242, such as wiring cables. Furthermore, as described in design example 2, cushioning material 25 may be disposed between bottom surface portion 242a (outside) of internal hollow portion 241 and region AR2 (inside) of hollow portion 220, and bottom surface portion 242a (outside) of internal hollow portion 241 may be fixed to region AR2 (inside) of hollow portion 220 via cushioning material 25.

[0040] <Design Example 4> In addition to the configurations described in design examples 1 to 3, driver unit 11 may further emit, into area AR (internal space) of hollow portion 220, an acoustic signal AC2 (second acoustic signal) in which frequency band components (for example, band components for which human hearing sensitivity is high, for example, 3 kHz-6 kHz band components) including the aforementioned predetermined frequency (for example, a band for which human hearing sensitivity is high, for example, 6 kHz) are suppressed. For example, as illustrated in FIG. 12B, an LPF (low-pass filter) section 200 may be provided between driver unit 11 and playback device 100 that outputs an output signal for driving driver unit 11. This low-pass filter suppresses (attenuates or flattens) frequency band components including the aforementioned predetermined frequency (for example, a band for which human hearing sensitivity is high). For example, the cutoff frequency of this low-pass filter is set to 3 kHz. The output signal output from playback device 100 is input to LPF section 200, which outputs a low-pass output signal in which the high-frequency side of this output signal is attenuated. The low-pass output signal is input to the driver unit 11, and the driver unit 11 is driven based on the low-pass output signal. As a result, the driver unit 11 emits an acoustic signal AC2 (second acoustic signal) into the area AR (internal space) of the hollow portion 220, in which frequency band components (for example, band components for which human hearing sensitivity is high, for example, 3 kHz-6 kHz band components) including the above-mentioned predetermined frequency (for example, a band for which human hearing sensitivity is high, for example, 6 kHz) are suppressed. The acoustic signal AC2 (second acoustic signal) emitted into the area AR (internal space) of the hollow portion 220 is further emitted to the outside from the sound hole 123a. Note that the LPF section 200 may be realized by electronic components such as a coil and a capacitor, or may be realized by digital processing. When the LPF section 200 is configured by electronic components such as a resistor and a capacitor, a power supply for driving the LPF section 200 is not required. In this case, the acoustic signal output device 20 may be a wired type that does not require a power supply. The LPF section 200 may be provided outside the housing 12 or may be provided in the housing 12 itself.

[0041] <Design Example 5> As shown in FIG. 12B, driver unit 11 emits acoustic signal AC2 (second acoustic signal) in which frequency band components (for example, band components in which human hearing sensitivity is high, for example, 3 kHz-6 kHz band components) including the aforementioned predetermined frequency (for example, a band in which human hearing sensitivity is high, for example, 6 kHz) are suppressed, into area AR (internal space) of hollow portion 220, or driver unit 11 emits acoustic signal AC2 (second acoustic signal) in which frequency band components including this predetermined frequency are not suppressed. of A switching unit 210 may be further provided that switches whether to emit the sound into the area AR (internal space) of the hollow portion 220. For example, the switching unit 210 switches whether to use the LPF unit 200 of design example 4. When switched to use the LPF unit 200, as described in design example 4, the low-pass output signal that has passed through the LPF unit 200 is input to the driver unit 11, and the driver unit 11 is driven based on this low-pass output signal. On the other hand, when switched not to use the LPF unit 200, the output signal output from the playback device 100 is input directly to the driver unit 11, and the driver unit 11 is driven based on this output signal. By manually operating this switching unit 210, the user can emit acoustic signals AC1 and AC2 with the above-mentioned frequency band components suppressed in an environment where sound leakage is a concern, thereby suppressing sound leakage in the high frequency range, and can emit acoustic signals AC1 and AC2 without suppressing the above-mentioned frequency band components in an environment where external noise is loud and sound leakage is not a concern. In the latter case, the above-mentioned frequency band components (for example, band components to which humans have high hearing sensitivity, for example, band components between 3 kHz and 6 kHz) are not suppressed, so music and voice can be heard even in high noise environments. Note that the switching unit 210 may be provided outside the housing 12 or may be provided within the housing 12 itself.

[0042] <Design Example 6> Instead of using LPF section 200 in design example 4, the high-frequency components (frequency band components including the above-mentioned specific frequency) of acoustic signal AC2 (second acoustic signal) emitted from driver unit 11 may be suppressed based on the structure of driver unit 11. For example, if the diaphragm of driver unit 11 is a dynamic type with a paper cone, the stiffness sh of the neck of the paper cone can be designed so that the high-frequency reproduction limit frequency fh of the paper cone is the upper limit (for example, 6 kHz or nearby) of the band where human hearing sensitivity is high (for example, the 3 kHz to 6 kHz band component). The high-frequency reproduction limit frequency fh and stiffness sh satisfy the following relationship: fh=(1 / (2π))×√(sh / M) where M is the mass of the vibration system including the cone paper. In other words, the softer the material of the diaphragm of driver unit 11, the lower the high-frequency reproduction limit frequency fh. Furthermore, such a driver unit 11 may be combined with LPF section 200 of design example 4.

[0043] <Experimental Results> 14B illustrates sound pressure levels when the LPF unit 200 is used (with LPF) and when the LPF unit 200 is not used (without LPF). As illustrated in FIG. 14B, it can be seen that by using the LPF unit 200, the sound pressure level in a band where human hearing sensitivity is high (for example, band components of 3 kHz to 6 kHz) is suppressed, and sound leakage can be reduced.

[0044] [Third embodiment] In the third embodiment, the mounting method of the acoustic signal output device described above will be exemplified.

[0045] <Wearing method 1> 15, one end 311 of a curved, rod-shaped ear hook 310 is fixed to the outside of the housing 12. By attaching this ear hook 310 to the auricle, the acoustic signal output device 10 (20) can be worn as shown in FIG. 5. In this example, one end 311 of the ear hook 310 is fixed to the area 132 (second area) side, not the area 131 (first area) side. As a result, the acoustic signal AC1 (first acoustic signal) emitted toward the area 131 side is emitted into the ear canal 1011 without being blocked by the ear hook 310.

[0046] <Wearing method 2> The acoustic signal output device 30 illustrated in Fig. 16A to Fig. 16C is configured by integrating the support portion 13 of the acoustic signal output device 10 (20) described above with the temple 33 of the eyeglasses. In this example, a region 131 (first region) of the support portion 13 is arranged on the ear hook portion 33a side (B1 direction side) of the temple 33 that is attached to the auricle 1020, and a region 132 (second region) that protrudes from the region 131 (first region) is arranged on the lens 34 side (B2 direction side). The region 132 (second region) is arranged inside the temple 33. side( D1 direction) and is configured in a shape that guides the acoustic signal AC1 (first acoustic signal) emitted from the sound hole 121a (first sound hole) toward the region 131 (first region) side (toward the B1 direction), as described above. When such eyeglasses are worn, the region 132 (second region) of the support part 13 comes into contact with and is supported by some part of the head (body), and the open end 131b of the sound hole 121a (first sound hole) and the region 131 (first region) of the support part 13 do not come into contact with at least a part of the head (body), and the region 131 (first region) is positioned on the ear canal 1011 side. The acoustic signal AC1 emitted from the sound hole 121a is guided toward the ear canal 1021 side (below the pinna 1020) and emitted.

[0047] <Wearing method 3> 17, an acoustic signal output device 3100 of wearing method 3 has a structural unit 2112 including a housing and a support unit, and a wearing unit 2122 configured to hold the structural unit 2112 and be worn on a middle part 1023 of the auricle 1020. The middle part 1023 is the middle part between the upper part 1022 (helix side) and the lower part 1024 (earlobe side) of the auricle 1020. The structural unit 2112 is the housing 12 and the support unit 13 exemplified in the first embodiment, its modified example, or the second embodiment.

[0048] <Wearing method 4> As illustrated in FIG. 18A, the acoustic signal output device 4100 of wearing method 4 has a structural part 2112 including a housing and a support part, and a wearing part 2224 configured to hold the structural part 2112 and be worn on the upper part 1022 of the auricle 1020, which is a part of the auricle 1020.

[0049] <Wearing method 5> As illustrated in Figure 18B, the acoustic signal output device 4100' of wearing method 5 has a structural part 2112 including a housing and a support part, a wearing part 2224 configured to hold the structural part 2112 and be worn on the upper part 1022 of the auricle 1020, which is part of the auricle 1020, and a wearing part 4421 configured to contact the concha cavity 1025 of the auricle 1020.

[0050] <Wearing method 6> The acoustic signal output device 4200 illustrated in FIG. 19 has a structural part 2112, a columnar mounting part 4210 configured to hold the structural part 2112 and be positioned at the base of the auricle 1020 when worn, and an arc-shaped mounting part 4220 held at both ends of the mounting part 4210 and worn in the area from the back side of the upper part 1022 of the auricle 1020 to the lower part 1024.

[0051] <Wearing method 7> The acoustic signal output device 5110 of the wearing method 7 illustrated in Figures 20A to 20E has a structural part 5111 that emits an acoustic signal, and a wearing part 5112 that holds the structural part 5111 and is hooked onto the back side of the upper part 1022 of the auricle 1020 when worn. 1 are the housing 12 and support section 13 exemplified in the first embodiment, its modified example, or the second embodiment. The attachment section 5112 is a bent rod-shaped member, and the structural section 5111 is attached to one end of the attachment section 5112 so that it can rotate in the R5 direction. The auricle 1020 is sandwiched between the structural section 5111 and the attachment section 5112, thereby fixing the acoustic signal output device 5110 to the auricle 1020. Furthermore, because the structural section 5111 can rotate in the R5 direction relative to one end of the attachment section 5112, the attachment position and the position of the sound hole can be adjusted to suit the size and shape of the individual auricle 1020.

[0052] <Wearing method 8> 21A to 21C , an acoustic signal output device 5120 of wearing method 8 has a structural part 5121 that emits an acoustic signal, and a wearing part 5122 that holds the structural part 5121 and is hooked onto the back side of the upper part 1022 of the auricle 1020 when worn. The structural part 5121 is the housing 12 and the support part 13 exemplified in the first embodiment, its modified example, or the second embodiment. Unlike wearing method 7, the structural part 5121 is not rotatable relative to the wearing part 5122. The auricle 1020 is sandwiched between the structural part 5121 and the wearing part 5122, thereby fixing the acoustic signal output device 5120 to the auricle 1020.

[0053] <Wearing Method 9> 22A and 22B show acoustic signal output devices 5130 and 5140 of wearing method 9, each of which has a structural portion 5131 and 5141 that emits an acoustic signal, and a wearing portion 5132 and 5142 that holds the structural portion 5131 and 5141 and is hooked onto the back side of the upper portion 1022 of the auricle 1020 when worn. The structural portions 5131 and 5141 are the housing 12 and the support portion 13 shown in the first embodiment, its modified example, or the second embodiment. Furthermore, the acoustic signal output device 5140 shown in FIG. 22B has a wearing portion 5143 that is configured to come into contact with the cavity of the concha 1025 of the auricle 1020 when worn. This allows for more stable wearing.

[0054] <Wearing method 10> 23A, 23B, and 23C includes a structural part 5151 that emits a sound signal, a rod-shaped mounting part 5152 that holds the structural part 5151 and is hooked onto the back side of the upper part 1022 of the auricle 1020 when worn, a column-shaped support part 5154 that holds the structural part 5151 at one end and the mounting part 5152 at the other end, and a rod-shaped support part 5154 that holds the structural part 5151 at one end and the mounting part 5152 at the other end. 0 The acoustic signal output device 5150 has a rod-shaped mounting part 5153 that can be hooked onto the back of the middle part 1023 and the upper part 1022 from the middle part 1023 side, and a column-shaped support part 5155 that holds the structural part 5151 at one end and the mounting part 5153 at the other end. The structural part 5151 is the housing 12 and the support part 13 exemplified in the first embodiment, its modified example, or the second embodiment. The auricle 1020 is sandwiched between the structural part 5151 and the mounting parts 5152, 5153, whereby the acoustic signal output device 5150 is fixed to the auricle 1020.

[0055] <Wearing method 12> 24A to 24E includes a structural part 5161 that emits acoustic signals, a columnar mounting part 5164 that holds the structural part 5161 and is configured to be positioned at the base of the auricle 1020 when worn, a rod-shaped mounting part 5162 that is held at one end of the mounting part 5164 and is hooked onto the back side of the upper part 1022 of the auricle 1020 when worn, and a rod-shaped mounting part 5163 that is held at the other end of the mounting part 5164 and is hooked onto the back side of the lower part 1024 of the auricle 1020 when worn. The structural part 5161 is the housing 12 and support part 13 exemplified in the first embodiment, its modified example, or the second embodiment. The auricle 1020 is made up of the structural part 5161, the mounting part 5164, and the mounting part 5162. 6 2,51 6 3, whereby the acoustic signal output device 5160 is fixed to the auricle 1020.

[0056] <Wearing method 13> The acoustic signal output devices 5170 and 5180 illustrated in FIGS. 25A to 25D and 26A to 26D respectively include structural parts 5171 and 5181 that emit acoustic signals, and Listen 102 0 and curved, strip-like support parts 5173, 5183, one end of which holds the structural part 5171, 5181 and the other end of which holds the mounting part 5172, 5182. The structural parts 5171, 5181 are the housing 12 and the support part 13 exemplified in the first embodiment, its modified example, or the second embodiment. The auricle 1020 is sandwiched between the structural parts 5171, 5181 and the mounting parts 5172, 5182, thereby fixing the acoustic signal output device 5170, 5180 to the auricle 1020.

[0057] <Wearing method 14> The acoustic signal output device 5190 illustrated in FIGS. 27A to 27C includes a structure 5191 that emits an acoustic signal, and a structure 5191 that holds the structure 5191 and is attached to the auricle 102 when worn. 0and a rod-shaped mounting part 5192 configured to be arranged on the back side of the auricle 1020. The structural part 5191 is the housing 12 and the support part 13 exemplified in the first embodiment, its modified example, or the second embodiment. The mounting part 5192 holds the structural part 5191 at one end that is arranged on the side of the lower part 1024 of the auricle 1020 when worn. The auricle 1020 is sandwiched between the structural part 5191 and the mounting part 5192, thereby fixing the acoustic signal output device 5190 to the auricle 1020.

[0058] <Wearing method 15> The acoustic signal output device 5200 illustrated in FIGS. 28A to 28E includes a structure 5201 that emits an acoustic signal, and a structure 5201 and an annular mounting portion 5202 that holds the auricle 1020. The structural portion 5201 is the housing 12 and the support portion 13 exemplified in the first embodiment, its modified example, or the second embodiment. When worn, the auricle 1020 is inserted into the annular mounting portion 5202, and the mounting portion 5202 is disposed behind the upper portion 1022, the middle portion 1023, and the lower portion 1024 of the auricle 1020. At this time, the auricle 1020 is sandwiched between the structural portion 5201 and the mounting portion 5202, whereby the acoustic signal output device 5200 is fixed to the auricle 1020.

[0059] <Wearing Method 16> As shown in FIG. 29A, the acoustic signal output device 5250 has a rod-shaped attachment part 5 curved in a shape that can be attached to the back of the head and the auricle 1020 of the user 1000. 2 52, a structural part 5251 may be fixed to the mounting part 5352. The structural part 5251 is the housing 12 and the support part 13 exemplified in the first embodiment, its modified example, or the second embodiment. The mounting part 5352 is mounted on the back of the head and the auricle 1020 of the user 1000, and the housing 12 and the support part 13 are arranged as described above.

[0060] <Wearing Method 17> The acoustic signal output device 5600 illustrated in FIG. 29B includes the driver unit 11 ( ShowThe acoustic signal output device 5600 has a substantially spherical housing 5612 (structural part) that houses the driver unit 11 inside, a substantially spherical attachment part 5601 that is placed on the auricle when worn, and a curved part 5602 that is an elastic body that connects the housing 5612 and the attachment part 5601. The housing 5612 is provided with a sound hole 121a (first sound hole) that emits (derives) to the outside an acoustic signal AC1 (first acoustic signal) emitted from the driver unit 11, and a sound hole 123a (second sound hole) that emits (derives) to the outside an acoustic signal AC2 (second acoustic signal) emitted from the driver unit 11. The acoustic signal output device 5600 may be designed so that the sound pressure level of the acoustic signal AC2 emitted to the outside from the sound hole 123a increases as the distance from the sound hole 121a increases. When the acoustic signal output device 5600 is worn, the housing 5612 is 6 12 is placed on the front side of the auricle (ear canal side) with the sound hole 121a facing the ear canal, and the attachment part 5601 is placed on the back side of the auricle (the side where the ear canal does not exist), and the auricle is sandwiched between the housing 5312 and the attachment part 5601.

[0061] [Fourth embodiment] In this embodiment, an acoustic signal output device of a type that is partly fitted into the ear canal but does not completely seal the ear canal will be exemplified.

[0062] <Example 4-1> As illustrated in Figures 30A to 30C, the acoustic signal output device 5300 of this example has the above-mentioned driver unit 11, a housing 5312 (structural part) that houses the driver unit 11 inside, and a support part 5313 (structural part) that is placed in the user's ear canal when worn.

[0063] <Chassis 5312> Housing 5312 is a hollow member with an outer wall, and houses driver unit 11 inside. For example, driver unit 11 is fixed to the end of housing 5312 on the D1 direction side. However, this does not limit the present invention. There are also no limitations on the shape of housing 5312.

[0064] <Sound holes 121a, 123a> The wall of the housing 5312 is provided with a sound hole 121a (first sound hole) that emits (derives) to the outside an acoustic signal AC1 (first acoustic signal) emitted from the driver unit 11, and a sound hole 123a (second sound hole) that emits (derives) to the outside an acoustic signal AC2 (second acoustic signal) emitted from the driver unit 11.

[0065] In this example, sound hole 121a (first sound hole) is provided in area AR1 (first area) of a wall portion located on one side of driver unit 11 (the D1 direction side, which is the side from which acoustic signal AC1 is emitted). Sound hole 121a in this example is located at an eccentric position shifted in the B1 direction (first direction) from axis A1 (central axis of the structural portion), and opens facing the D1 direction. Note that axis A1 is an axis that passes through the central area of ​​housing 5312 and extends in the D1 direction, and direction B1 is a specific radiation direction centered on axis A1. In this example, for the sake of simplicity of explanation, Open end The edge shape of the Open end 1 shows an example in which the edge of sound hole 121a is elliptical. However, this does not limit the present invention. For example, the shape of the edge of sound hole 121a may be other shapes such as a circle, a square, or a triangle. Furthermore, the end of sound hole 121a may be mesh-like. In other words, the end of sound hole 121a may be made up of multiple holes. Furthermore, in this example, for the sake of simplicity of explanation, an example is shown in which one sound hole 121a is provided in area AR1 (first area) of the wall of housing 5312. However, this does not limit the present invention. For example, two or more sound holes 121a may be provided in area AR1 (first area) of the wall of housing 5312.

[0066] In this example, sound hole 123a (second sound hole) is provided in region AR3 of wall 123, which is in contact with the region between region AR1 of the wall of housing 5312 and region AR2 of the wall arranged on the D2 direction side of driver unit 11 (the other side from which acoustic signal AC2 is emitted). Furthermore, sound hole 123a (second sound hole) in this example is arranged biased toward the B2 direction (second direction) side. B2 direction (second direction) is a direction that includes a component in the opposite direction of B1 direction (first direction). Specific examples of such an arrangement are as exemplified in the above-described embodiments and their modified examples. Furthermore, the design is such that the sound pressure level of acoustic signal AC2 emitted to the outside from sound hole 123a increases as the distance from sound hole 121a increases. Specific examples of such an arrangement are as exemplified in the above-described embodiments and their modified examples.

[0067] <Support Department 5313> The support portion 5313 is a convex portion provided on the outer surface of the wall portion on the D1 direction side of the housing 5312. At least a part of the outer surface area of ​​the support portion 5313 has a convex shape. The outer surface area of ​​the support portion 5313 is an outer surface area surrounding the opening end 131b of the sound hole 121a (first sound hole). The outer surface area of ​​the support portion 5313 includes an area 53131 (first area) and an area 53132 (second area) that protrudes beyond the area 53131 (first area). Here, the outer surface area of ​​the support portion 5313 may be configured in a shape that guides the acoustic signal AC1 (first acoustic signal) emitted from the sound hole 121a (first sound hole) toward the area 53131 (first area). In this example, the support portion 5313 including the region 53131 and the region 53132 is provided on the B1 direction side, and the support portion 5313 is not provided in the region 5314 on the B2 direction side including the opposite direction component.

[0068] <Wearing state> The difference from the first embodiment is that when the acoustic signal output device 5300 is worn, the tip of the housing 5312 on the support section 5313 side is inserted into the ear canal of the user. When the tip of the housing 5312 is inserted into the ear canal, the region 5314 on the B2 side where the support section 5313 is not provided comes into contact with the inside of the ear canal.5313 The region 53132 (second region) also contacts the inside of the ear canal. 5313 The area 53131 (first area) does not come into contact with the inside of the ear canal. Therefore, a gap is formed between the area 53131 and the inside of the ear canal, and this causes the ear canal to not be sealed. This has the advantage that the user can easily hear external sounds. On the other hand, the sound hole 121a Open end A portion of the acoustic signal AC1 emitted from 131b is emitted to the outside through the gap between the area 53131 and the inside of the ear canal. The acoustic signal AC1 thus emitted to the outside is perceived as sound leakage, but as explained in the first embodiment, this acoustic signal AC1 is canceled out by the acoustic signal AC2 emitted from the sound hole 123a, thereby suppressing sound leakage. Furthermore, since the sound hole 123a in this example is positioned biased toward the B2 direction, the acoustic signal AC2 emitted from the sound hole 123a is less likely to enter the inside of the ear canal through the gap between the area 53131 and the inside of the ear canal. Therefore, the acoustic signal AC1 is not canceled out much in the ear canal, and the user can hear the acoustic signal AC1 with sufficient sound quality. A battery case for storing and charging the acoustic signal output device 5300 may be provided. In this case, the support section 5313 For example, the support portion 5300 may be designed in accordance with the convex shape provided on the support portion 5300 only in the area where the convex shape comes into contact when the acoustic signal output device 5300 is stored in the battery case. 5313 If the convex shape is made of a material that allows its shape to be changed, the convex shape may be designed to be smaller by a predetermined size than the size including the convex shape, for example, so that the acoustic signal output device 5300 is held in the battery case by the convex shape when the acoustic signal output device 5300 is stored in the battery case.

[0069] <Example 4-2> In Example 4-1, support portion 5313 is provided on the B1 direction side of the outer surface of the wall portion on the D1 direction side of housing 5312, and no support portion is provided in region 5314 on the B2 direction side, which includes the opposite direction component (FIG. 30A). However, a protruding region surrounding opening end 131b of sound hole 121a may be provided in region 5314. This protruding region surrounding opening end 131b is, for example, an annular convex region surrounding the B2 direction side of opening end 131b. Preferably, when acoustic signal output device 5300 is worn, most or all of this annular convex region surrounding the B2 direction side of opening end 131b comes into contact with the inside of the ear canal, and the protruding region of sound hole 121a Open end It is desirable that the acoustic signal AC1 emitted from 131b not leak as far as possible in the direction B2.

[0070] <Example 4-3> Instead of providing the support section 5313 of Example 4-1, a sound hole 53123b (for example, a through-hole) may be provided on the outer surface of the wall section on the D1 direction side of the housing 5312, as in an acoustic signal output device 5400 illustrated in Fig. 31A to Fig. 31C. The sound hole 53123b takes in external sound into the ear canal and emits to the outside the acoustic signal AC1 emitted inside the housing 5312. In this example, the sound hole 53123b is provided on the B1 direction side, and no sound hole 53123b is provided in an area 5314 on the B2 direction side that includes the opposite direction component.

[0071] When the acoustic signal output device 5400 is worn, if the tip of the housing 5312 is inserted into the ear canal, the tip of the housing 5312 comes into contact with the inside of the ear canal. Also, the sound hole 53123b is arranged on the outside of the ear canal, so that the ear canal is not sealed. This has the advantage that the user can easily hear external sounds. On the other hand, the sound hole 121a Open endA portion of the acoustic signal AC1 emitted from sound hole 131b is emitted to the outside through sound hole 53123b. The acoustic signal AC1 emitted to the outside in this manner is perceived as sound leakage, but as described in the first embodiment, this acoustic signal AC1 is canceled out by the acoustic signal AC2 emitted from sound hole 123a, thereby suppressing sound leakage. Furthermore, because sound hole 123a in this example is positioned offset toward the B2 direction, the acoustic signal AC2 emitted from sound hole 123a is less likely to enter the ear canal through sound hole 53123b. Therefore, the acoustic signal AC1 is not canceled out significantly in the ear canal, allowing the user to hear the acoustic signal AC1 with sufficient sound quality.

[0072] <Example 4-4> As illustrated in FIGS. 32A and 32B, acoustic signal output device 5500 of this example has driver unit 11 described above and housing 5512 (structural section) that houses driver unit 11. Housing 5512 has insertion section 5512a that is inserted into the ear canal when worn, and external placement section 5512b that is placed somewhere on the auricle. Insertion section 5512a is provided with through-hole 55121 that passes through insertion section 5512a. As a result, even when insertion section 5512a is inserted into the ear canal, the ear canal is open to the outside through through-hole 55121 and is not sealed. Note that although the external shape of insertion section 5512a in FIGS. 32A and 32B is a donut shape with through-hole 55121, insertion section 5512a may have another shape with through-hole 55121 (for example, a prismatic shape or a triangular prism shape with through-hole 55121). One side of insertion portion 5512a (the side inserted into the ear canal when worn: the D1 direction side) is provided with one or more sound holes 121a (first sound holes). Furthermore, the other side (the D2 direction side) of insertion portion 5512a is provided with one or more sound holes 123a (second sound holes). As described above, sound hole 121a emits acoustic signal AC1 emitted from driver unit 11 to the outside, and sound hole 123a emits acoustic signal AC2 emitted from driver unit 11 to the outside. Furthermore, the design may be such that the sound pressure level of acoustic signal AC2 emitted to the outside from sound hole 123a increases the farther the space is from sound hole 121a. Specific examples of such an arrangement are as exemplified in the above-mentioned embodiments and their modified examples.

[0073] When wearing the acoustic signal output device 5500, the insertion part 5512a of the housing 5512 is inserted into the ear canal, and the external placement part 5512b is placed somewhere on the pinna. The through-hole 55121 of the insertion part 5512a does not seal the ear canal. This has the advantage that the user can easily hear external sounds. On the other hand, the sound hole 121a Open endA part of the acoustic signal AC1 emitted from 131b is emitted to the outside through through hole 55121. The acoustic signal AC1 thus emitted to the outside is perceived as sound leakage, but as described in the first embodiment, this acoustic signal AC1 is cancelled out by the acoustic signal AC2 emitted from sound hole 123a, thereby suppressing sound leakage.

[0074] <Example 4-5> Any of Example 4-1 to Example 4-4 may be combined with Design Examples 1 to 6 of the second embodiment. That is, in any of Examples 4-1 to 4-4, the resonant frequency of the hollow portion of housings 5312, 5512 may be designed to be equal to or higher than a predetermined frequency (for example, equal to or higher than a band where human hearing sensitivity is high, for example, 6 kHz or higher), and acoustic signal AC2 (second acoustic signal) in which frequency band components including the predetermined frequency (for example, band components where human hearing sensitivity is high, for example, band components of 3 kHz to 6 kHz) are suppressed may be designed to be emitted to the outside from sound hole 123a (second sound hole).

[0075] <Example 4-6> 33, a structural unit 5781 may be fixed to a rod-like attachment unit 5782 that is curved into a shape so as to be worn on the shoulder or neck of a user 1000. The structural unit 5781 is, for example, any one of the acoustic signal output devices 5300, 5400, and 5500 of Examples 4-1 to 4-5.

[0076] [Fifth embodiment] In the above embodiments, an acoustic signal output device having a substantially cylindrical housing (structural part) with both end faces has been exemplified. However, the housing of the acoustic signal output device may have other shapes. In this embodiment, an acoustic signal output device is exemplified, which is integrated with eyeglasses (glasses) and in which components of the eyeglasses function as the housing (structural part).

[0077] 34A to 36 show an example of an acoustic signal output device 6100 integrated with eyeglasses. The acoustic signal output device 6100 of this embodiment has an eyeglass shape and includes temples 6111, 6121, tip cells (tip members) 6112, 6122, and a front frame (front) 6131. ​​One ends of the temples 6111, 6121 are attached to both edges of the front frame 6131, and the other ends of the temples 6111, 6121 are connected to one ends of the tip cells 6112, 6122. The temples 6111, 6121 (structural parts) are hollow, and each houses a driver unit 11. In other words, the temples 6111, 6121 (structural parts) also serve as a housing. As described above, the driver unit 11 emits an acoustic signal AC1 from one surface 111 and an acoustic signal AC2 from the other surface 112. The acoustic signal AC1 is a signal that the user 1000 hears. For example, the acoustic signal AC2 is an inverse phase signal of the acoustic signal AC1 or an approximation of the inverse phase signal, and is a signal for suppressing sound leakage to the surroundings.

[0078] Vine 6111, 61 21, temples 6111, 6121 are respectively connected to one side surface 111 of driver unit 11. 61 In this embodiment, the temples 6111, 6112, 6113, 6114, 6115, 6116, 6117, 6118, 6119, 6120, 6121a, 6121b, 6121c, 6121d, 6121e, 6121f, 6121g, 6121h, 6121i, 6121m ...2, 6123, 6124, 6125, 6126, 6127, 6128, 6129, 6130, 6131, 6132, 6133, 6134, 6135, 6136, 6137, 61 The lower surfaces 6111d and 6121d of the temple 6111 are provided with one sound hole 121a. 61 The lower surfaces 6111d and 6121d of the temple 6111 are connected to the lower surfaces 6112d and 6122d of the tip cells 6112 and 6122, respectively. 61 The lower surfaces 6111d and 6121d of the front cells 6112 and 6122 are surfaces that are positioned on the lower side when the user 1000 wears the acoustic signal output device 6100. The lower surfaces 6112d and 6122d of the front cells 6112 and 6122 are surfaces that are supported by the pinnae of both ears of the user 1000 (for example, surfaces that come into contact with the pinnae) when the user 1000 wears the acoustic signal output device 6100.

[0079] Furthermore, Vine 6111, 61 21, temples 6111, 6112 are respectively connected to the other side surface 112 of the driver unit 11. 61In this embodiment, the temple 6111, 61 21 are provided with a plurality of sound holes 123a. For example, one sound hole 123a is provided on each of the side surface 6111b and the top surface 6111a of the temple 6111. That is, in this example, two sound holes 123a are provided in the temple 6111. Similarly, for example, one sound hole 123a is provided on each of the side surface 6121b and the top surface 6121a of the temple 6121. That is, in this example, two sound holes 123a are provided in the temple 6121. Note that the temples 6111, 61 The upper surfaces 6111a and 6121a of the temples 6111 and 6121 are surfaces that are positioned on the upper side when the user 1000 wears the acoustic signal output device 6100. That is, the upper surfaces 6111a and 6121a are surfaces that are positioned opposite the lower surfaces 6111d and 6121d, respectively. Furthermore, the lower surfaces 6112d and 6122d of the temples 6112 and 6122 are surfaces that are supported by the pinnae of both ears of the user 1000 when the user 1000 wears the acoustic signal output device 6100 (for example, surfaces that come into contact with the pinnae). The side surfaces 6111b of the temples 6111 and the side surfaces 6121b of the temples 6121 are surfaces that face outward when the user 1000 wears the acoustic signal output device 6100 (FIG. 36). In other words, when user 1000 wears acoustic signal output device 6100, side 6111c of temple 6111 and side 6121c of temple 6121 face inward (toward user 1000), and side 6111b located opposite side 6111c and side 6121b located opposite side 6121c face outward from user 1000.

[0080] Furthermore, in this embodiment, for example, when the user 1000 wears the acoustic signal output device 6100 (FIG. 36), the sound pressure of the acoustic signal AC2 emitted from the sound hole 123a provided in the temple 6121 that is closer to the ear canal 1021 of one ear (for example, the left ear) of the user 1000 (the sound hole 123a that is the distance dis1 from the ear canal 1021; for example, the sound hole 123a provided on the side surface 6121b) is configured to be lower than the sound pressure of the acoustic signal AC2 emitted from the sound hole 123a that is the farthest from the ear canal 1021 of the user 1000's ear (the sound hole 123a that is the distance dis2 from the ear canal 1021; however, dis2>dis1; for example, the sound hole 123a provided on the top surface 6121a). For example, the acoustic signal AC2 emitted from the sound hole 123a provided in the temple 6121 that is closest to the ear canal 1021 of the user's 1000 ear is configured to have a lower sound pressure than the acoustic signal AC2 emitted from the other sound holes 123a provided in the temple 6121. Similarly, for example, when the user 1000 wears the acoustic signal output device 6100, the sound pressure of the acoustic signal AC2 emitted from the sound hole 123a provided in the temple 6111 that is closer to the ear canal of the user's 1000's other ear (for example, the right ear) is configured to be lower than the sound pressure of the acoustic signal AC2 emitted from the sound hole 123a farthest from the ear canal of the user's 1000 ear. For example, of the sound holes 123a provided in temple 6111, the sound pressure of acoustic signal AC2 emitted from sound hole 123a that is closest to the ear canal of the other ear of user 1000 is configured to be lower than the sound pressure of acoustic signal AC2 emitted from the other sound holes 123a provided in temple 6111. The sound pressure of acoustic signal AC2 emitted from sound hole 123a may be adjusted by the opening area, shape, depth, etc. of sound hole 123a, or by a sound-absorbing material attached to sound hole 123a, or by the path and distance from driver unit 11 to sound hole 123a, or by emitting acoustic signals AC2 generated by multiple driver units 11 with different outputs from multiple sound holes 123a, or by other methods.This prevents the acoustic signal AC2 emitted from the sound hole 123a close to the ear canal from partially canceling out the acoustic signal AC1 in the ear canal, which would otherwise result in a deterioration in the sound quality heard by the user 1000. On the other hand, the temple 6111, 61 Since each of the acoustic signals AC1 and AC2 is provided with a plurality of sound holes 123a, sound leakage of the acoustic signal AC1 can be sufficiently suppressed by the acoustic signal AC2 emitted from the sound holes 123a.

[0081] In this embodiment, the distance between upper surface 6111a and lower surface 6111d in region 6111e of temple 6111 on the tip cell 6112 side is larger than the distance between upper surface 6111a and lower surface 6111d in region 6111f that is closer to tip cell 6112 than region 6111e. That is, temple 6111 is tapered from region 6111e to region 6111f, for example. In this embodiment, sound hole 121a is located between region 6111e and region 6111f of lower surface 6111d. That is, the region 6111e (second region) protrudes further toward the lower surface 6111d (D1 direction) than the region 6111f (first region), and is configured in a shape that guides the acoustic signal AC1 (first acoustic signal) emitted from the sound hole 121a (first sound hole) toward the region 6111f (first region) side (B1 direction). Similarly, in this embodiment, the distance between the upper surface 6121a and the lower surface 6121d in the region 6121e of the temple 6121 on the tip cell 6122 side is larger than the distance between the upper surface 6121a and the lower surface 6121d in the region 6121f that is closer to the tip cell 6122 than the region 6121e. That is, the temple 6121 is formed in a tapered shape from the region 6121e to the region 6121f, for example. Furthermore, sound hole 121a in this embodiment is disposed between region 6121e and region 6121f of lower surface 6121d. That is, region 6121e (second region) protrudes further toward lower surface 6121d (direction D1) than region 6121f (first region), and is configured in a shape that guides acoustic signal AC1 (first acoustic signal) emitted from sound hole 121a (first sound hole) toward region 6121f (first region) (direction B1). As a result, when user 1000 wears acoustic signal output device 6100, acoustic signal AC1 emitted from each sound hole 121a is guided toward the ear canal.

[0082] [Modification 1 of the Fifth Embodiment] In the fifth embodiment, the acoustic signal output device 6100 is configured so that, when the user 1000 wears the acoustic signal output device 6100, the sound pressure of the acoustic signal AC2 emitted from the sound hole 123a, of the sound holes 123a provided in the temples 6111 and 6121, that is closer to the ear canal of the user 1000 is lower than the sound pressure of the acoustic signal AC2 emitted from the sound hole 123a that is farther from the ear canal of the user 1000. However, the acoustic signal output device 6100 may be configured so that, when the user 1000 wears the acoustic signal output device 6100, the sound pressure of the acoustic signal AC2 emitted from the sound hole 123a, of the sound holes 123a provided in the temples 6111 and 6121, that is facing in a direction close to the axial direction of the ear canal of the user 1000 is lower than the sound pressure of the acoustic signal AC2 emitted from the sound hole 123a facing in a direction away from the axial direction of the ear canal. Note that a sound hole facing a certain direction is, for example, a sound hole that opens in that direction, a sound hole in the axial direction of that direction, a sound hole with an opening surface perpendicular to that direction, etc. This prevents the sound signal AC2 emitted from the sound hole 123a facing in a direction close to the axial direction of the ear canal from partially canceling out the sound signal AC1 in the ear canal, which would result in a deterioration in the sound quality heard by the user 1000. 61 Since each of the acoustic signals AC1 and AC2 is provided with a plurality of sound holes 123a, sound leakage of the acoustic signal AC1 can be sufficiently suppressed by the acoustic signal AC2 emitted from the sound holes 123a.

[0083] For example, as in the acoustic signal output device 6200 illustrated in FIG. 37A and FIG. 38, 61The bottom surfaces 6111d and 6121d of the microphone 21 may each be provided with one sound hole 121a, and one sound hole 123a may each be provided with one sound hole 123a, and the side surfaces 6111b and 6121b may each be provided with one sound hole 123a. In this example, when the user 1000 wears the acoustic signal output device 6200 (Figure 38), the sound pressure of the acoustic signal AC2 emitted from the sound holes 123a provided in the temple 6121 that face in a direction close to the axial direction of the ear canal 1021 of one ear (for example, the left ear) of the user 1000 (sound holes 123a that face in a direction that forms an angle θ1 with the axial direction of the ear canal 1021; for example, sound holes 123a provided on the lower surface 6111d) is configured to be lower than the sound pressure of the acoustic signal AC2 emitted from the sound holes 123a that face in a direction away from the axial direction of the ear canal 1021 (sound holes 123a that face in a direction that forms an angle θ2 with the axial direction of the ear canal 1021; however, θ2 > θ1; for example, sound holes 123a provided on the side surface 6121b). For example, when the user 1000 wears the acoustic signal output device 6200 (FIG. 38), the sound pressure of the acoustic signal AC2 emitted from the sound hole 123a provided in the temple 6121 that faces the direction closest to the axial direction of the ear canal 1021 is configured to be lower than the sound pressure of the acoustic signal AC2 emitted from the other sound holes 123a. The distances between the ear canal 1021 and the sound holes 123a provided in the temple 6121 may or may not be the same. Similarly, in this example, when the user 1000 wears the acoustic signal output device 6200, the sound pressure of the acoustic signal AC2 emitted from the sound hole 123a, of the sound holes 123a provided in the temple 6111, that faces in a direction close to the axial direction of the ear canal of the other ear (for example, the right ear) of the user 1000 is configured to be lower than the sound pressure of the acoustic signal AC2 emitted from the sound hole 123a that faces in a direction away from the axial direction of the ear canal. For example, when the user 1000 wears the acoustic signal output device 6200, the sound pressure of the acoustic signal AC2 emitted from the sound hole 123a, of the sound holes 123a provided in the temple 6111, that faces in a direction closest to the axial direction of the ear canal is configured to be lower than the sound pressure of the acoustic signal AC2 emitted from the other sound holes 123a.The distance between the ear canal and each sound hole 123a provided in the temple 6111 may or may not be the same. The rest is the same as in the fifth embodiment.

[0084] [Modification 2 of the Fifth Embodiment] The number of sound holes 121a (first sound holes) and sound holes 123a (second sound holes), as well as their positions and orientations, are not limited to those of the fifth embodiment or its modified example 1. For example, as in an acoustic signal output device 6300 illustrated in FIG. 37B, at least one of the sound holes 121a, 123a may be disposed in the front cells 6112, 6122, or may be disposed on another surface of the temples 6111, 6121. At least one of the sound holes 121a, 123a may be disposed in an area of ​​the temples 6111, 6121 close to the front frame 6131, or may be disposed in an area close to the front cells 6112, 6122, or may be disposed on the front frame 6131. ​​In either case, an acoustic signal AC1 is emitted from the sound hole 121a, and an acoustic signal AC2 is emitted from the sound hole 123a. 2At least one of temples 6111, 6121, tip cells 6112, 6122, and front frame 6131 is hollow so that sound can be emitted, and driver unit 11 is housed inside. Also, it is desirable that sound hole 123a is not provided in a region that is closest to the ear canal of user 1000 when user 1000 wears the acoustic signal output device. For example, of sound holes 121a, 123a provided in the acoustic signal output device, it is desirable that the sound hole that is positioned closest to the ear canal of user 1000 when user 1000 wears the acoustic signal output device is sound hole 121a, not sound hole 123a. Also, of sound holes 121a, 123a provided in the acoustic signal output device, it is desirable that the sound hole that faces closest to the axial direction of the ear canal of user 1000 when user 1000 wears the acoustic signal output device is sound hole 121a, not sound hole 123a. In either case, it is desirable that, among the sound holes 123a provided in the acoustic signal output device, the sound pressure of the acoustic signal AC2 emitted from the sound hole 123a that is located closest to the ear canal when the user 1000 wears the acoustic signal output device be smaller than the sound pressure of the acoustic signal AC2 emitted from the other sound holes 123a. Alternatively, it is desirable that, among the sound holes 123a provided in the acoustic signal output device, the sound pressure of the acoustic signal AC2 emitted from the sound hole 123a that is facing in the direction closest to the axial direction of the ear canal when the user 1000 wears the acoustic signal output device be smaller than the sound pressure of the acoustic signal AC2 emitted from the other sound holes 123a.

[0085] [Sixth embodiment] The opening area of ​​the sound hole 123a (second sound hole) may be changeable. In this embodiment, a configuration in which the opening area of ​​the sound hole 123a of the acoustic signal output device integrated with the glasses described in the fifth embodiment and its modified examples is changed is exemplified. However, in the first to third embodiments and their modified examples, the opening area and opening shape of the sound hole 123a may be changeable.

[0086] As illustrated in FIGS. 39A and 39B, the acoustic signal output device 6400 of this embodiment includes temples 6111, 6121, tip cells 6112, 6122, and a front frame 6131. ​​One ends of the temples 6111, 6121 are attached to both edges of the front frame 6131, and the other ends of the temples 6111, 6121 are connected to one ends of the tip cells 6112, 6122. The insides of the temples 6111, 6121 (structural parts) are hollow, and each houses a driver unit 11 inside.

[0087] As in the fifth embodiment, temple 6111, 61 21, temples 6111, 6121 are respectively connected to one side surface 111 of driver unit 11. 61 21 is provided with a sound hole 121a (first sound hole) for emitting the acoustic signal AC1 emitted inside the sound hole 121a to the outside.

[0088] Vine 6111, 61 21, temples 6111, 6112 are respectively connected to the other side surface 112 of the driver unit 11. 61 In this embodiment, the temple 6111, 61 However, this is only an example, and as illustrated in the fifth embodiment and its modified examples, the temples 6111, 6121b each have one sound hole 123a. 61 21 may be provided with a plurality of sound holes 123a.

[0089] As shown in Figures 39A to 40, temples 6111, 61 21 each have movable parts 6415, 6425 for changing the opening area of ​​at least one sound hole 123a. The mechanical configuration of the movable parts 6415, 6425 may be any as long as it can change the opening area of ​​the sound hole 123a. As an example, a configuration in which the opening area of ​​the sound hole 123a is changed by sliding the movable parts 6415, 6425 is shown here. As shown in Figures 40A to 40C, the movable parts 6415, 6425 are connected to temples 6111, 6121 in the direction D5, and the opening area of ​​the sound hole 123a can be changed depending on the positional relationship between the movable parts 6415, 6425 and the sound hole 123a. That is, as illustrated in FIG. 40A, when the movable parts 6415, 6425 do not cover the sound hole 123a, the opening area of ​​the sound hole 123a can be maximized. As illustrated in FIG. 40B, the opening area of ​​the sound hole 123a can be reduced by the movable parts 6415, 6425 covering a portion of the sound hole 123a. Furthermore, as illustrated in FIG. 40C, the movable parts 6415, 6425 may completely cover the sound hole 123a, thereby closing the sound hole 123a. In this way, by varying the opening area of ​​at least one sound hole 123a, the sound pressure of the acoustic signal AC2 emitted from the sound hole 123a can be changed, and the degree to which the acoustic signal AC1 emitted from the sound hole 123a is canceled out can be controlled. In an environment where it is not necessary to suppress sound leakage of the acoustic signal AC1, all of the sound holes 123a may be closed.

[0090] The configuration may be such that user 1000 can manually move movable parts 6415, 6425, or such that movable parts 6415, 6425 can be moved by power such as a motor. Furthermore, the relative positions of movable parts 6415, 6425 with respect to sound hole 123a may be continuously changeable or discretely changeable. When the relative positions of movable parts 6415, 6425 with respect to sound hole 123a are discretely changeable, sound hole 123a may be designed so that its opening area and opening shape can be set to a plurality of preset sizes and shapes. This allows for a sound leakage suppression effect that is optimized in advance according to the environment.

[0091] The moving direction of the movable parts 6415, 6425 may be any direction. For example, the movable parts 6415, 6425 may move in the D5 direction (the horizontal direction in FIG. 40A, etc.), a direction perpendicular to the D5 direction (the vertical direction in FIG. 40A, etc.), or a combination of these directions (for example, a diagonal direction in FIG. 40A, etc.). The movable parts 6415, 6425 may not only move in a one-dimensional direction (for example, the D5 direction in FIGS. 40A to 40C), but also in a two-dimensional direction (for example, the D5 direction and a direction perpendicular to the D5 direction) along a plane including the opening of the sound hole 123a (for example, the side surface 6121b). This improves the degree of freedom in the opening shape and opening position of the sound hole 123a. As a result, the degree and direction of sound leakage of the acoustic signal AC1 due to the acoustic signal AC2 emitted from the sound hole 123a can be precisely controlled. Furthermore, a plurality of movable parts 6415, 6425 that can move in different directions relative to one sound hole 123a may be provided, and sound hole 123a may be covered by these plurality of movable parts 6415, 6425. This further improves the degree of freedom in the opening shape and opening position of sound hole 123a, allowing for more detailed control of the degree and direction of sound leakage of acoustic signal AC1.

[0092] Vine 6111, 61 21 may each be provided with a plurality of sound holes 123a, and movable parts 6415, 6425 may be provided for changing the opening area of ​​those sound holes 123a. One or more sound holes 123a may be provided in front cells 6112, 6122 or front frame 6131, and movable parts 6415, 6425 may be provided for changing the opening area of ​​those sound holes 123a. The directivity of the acoustic signal AC2 emitted from at least one sound hole 123a may be changed by changing the opening area or opening shape of that sound hole 123a. For example, the directivity of the acoustic signal AC2 emitted from a plurality of sound holes 123a that open in different directions (for example, sound holes 123a provided in top surfaces 6111a, 6121a and sound holes 123a provided in side surfaces 6111b, 6121b) may be changed by changing the opening area or opening shape of any of those sound holes 123a. That is, the opening direction of sound hole 123a may be changed by movable parts 6415 and 6425.

[0093] In addition, as described above, in the first to third embodiments and their modified examples, a movable part that changes the opening area or opening shape of the sound hole 123a may be provided. Also, instead of a slidable movable part, a movable part like a shutter aperture may be provided. Re Alternatively, a movable part having another shape may be provided.

[0094] [Other variations] The present invention is not limited to the above-described embodiments. For example, in the above-described embodiments, the housing 12 and the support part 13 are separate bodies, but the housing 12 and the support part 13 may be integrally configured.

[0095] In the first embodiment, the housing 12 may not be provided with the sound hole 123a. Even in this case, when the housing 12 and the support part 13 (structural part) are attached to the pinna 1010 of the user 1000, the region 132 (second region) of the support part 13 is supported by contacting any part of the pinna 1010 (body), and the opening end 131b of the sound hole 121a (first sound hole) and the region 131 (first region) of the support part 13 are not in contact with at least a part of the pinna 1010 (body), and the region 131 (first region) is positioned on the ear canal 1011 side. In this case, the region 13 2 The support portion 13 comes into contact with the pinna 1010 and acts as a support, providing a high sense of stability when worn. Furthermore, the B2 side of the opening end 131b of the sound hole 121a is surrounded by the region 132, which can prevent the acoustic signal AC1 emitted from the sound hole 121a from leaking in the B2 direction (sound leakage). Furthermore, in the second embodiment, the support portion 13 does not have to be provided.

[0096] Furthermore, in each of the above-described embodiments, driver unit 11 is housed inside housing 12. However, driver unit 11 may be disposed outside housing 12, and acoustic signals AC1 and AC2 emitted from driver unit 11 may be introduced into housing 12 through a waveguide.

[0097] [Note] The above content is summarized below. [Item 11] An acoustic signal output device, a structural portion provided with one or more first sound holes for emitting a first acoustic signal to the outside and one or more second sound holes for emitting a second acoustic signal to the outside, the first sound hole is disposed at an eccentric position displaced in a first direction from a central axis of the structural portion, a sound pressure level of the second acoustic signal emitted from the second sound hole into the first space is lower than a sound pressure level of the second acoustic signal emitted from the second sound hole into the second space, the first space is a space located on a first direction side with respect to the first sound hole, the second space is a space located on a second direction side with respect to the first sound hole, and the second direction includes a component in a direction opposite to the first direction, When the first acoustic signal is emitted from the first sound hole and the second acoustic signal is emitted from the second sound hole, the attenuation rate of the first acoustic signal at a second point farther from the acoustic signal output device than a predetermined first point where the first acoustic signal arrives is a predetermined value smaller than the attenuation rate of the acoustic signal due to air propagation at the second point relative to the first point; Is designed to be: an attenuation amount of the first acoustic signal at the second point relative to the first point, a predetermined value greater than the attenuation of the acoustic signal due to air propagation at the second point relative to the first point; It is designed to be more than Acoustic signal output device. [Item 12] Item 11: The acoustic signal output device according to item 11, an acoustic signal output device, wherein the total area of ​​the open ends of the second sound holes facing the first space is smaller than the total area of ​​the open ends of the second sound holes facing the second space. [Item 13] The acoustic signal output device according to item 11 or 12, a plurality of the second sound holes are provided in the structural portion, an acoustic signal output device in which the sound pressure level of the second acoustic signal emitted from one of the opening ends of the second sound hole that faces the first space is lower than the sound pressure level of the second acoustic signal emitted from the other of the opening ends of the second sound hole that faces the second space. [Item 14] Item 11: The acoustic signal output device according to item 11, At least a portion of the outer surface area surrounding the open end of the first sound hole has a convex shape, An acoustic signal output device, wherein the outer surface area includes a first area and a second area that protrudes further than the first area, and is configured in a shape that guides a first acoustic signal emitted from a first sound hole toward the first area. [Item 15] Item 15. The acoustic signal output device of item 14, an open end of the first sound hole faces a space surrounded by the second area, An acoustic signal output device, wherein the first area side of the space surrounded by the second area is open outward toward the outer periphery of the space surrounded by the second area. [Item 16] Item 14 or 15, the acoustic signal output device, The first area is disposed on the first direction side of the second area. [Item 17] Item 14 or 15, the acoustic signal output device, When the structure is attached to the body, the second region is supported in contact with any part of the body; the open end of the first sound hole and the first area do not come into contact with at least a part of the body, The first region is disposed on the ear canal side. The acoustic signal output device is configured as follows.

[0098] [Item 21] a first sound hole or holes for emitting a first acoustic signal to the outside, and a structural portion in which at least a part of an outer surface area surrounding an open end of the first sound hole is convex; An acoustic signal output device, wherein the outer surface area includes a first area and a second area that protrudes further than the first area, and is configured in a shape that guides the first acoustic signal emitted from the first sound hole toward the first area. [Item 22] Item 21, the acoustic signal output device, an open end of the first sound hole faces a space surrounded by the second area, An acoustic signal output device, wherein the first area side of the space surrounded by the second area is open outward toward the outer periphery of the space surrounded by the second area. [Item 23] Item 21, the acoustic signal output device, When the structure is attached to the body, the second region is supported in contact with any part of the body; the open end of the first sound hole and at least a part of the first area do not come into contact with the body, The first region is disposed on the ear canal side. The acoustic signal output device is configured as follows. [Item 24] 24. The acoustic signal output device according to any one of items 21 to 23, the structure is further provided with one or more second sound holes for emitting a second acoustic signal to the outside, an open end of the second sound hole faces a space outside the space surrounded by the second area, When the first acoustic signal is emitted from the first sound hole and the second acoustic signal is emitted from the second sound hole, the attenuation rate of the first acoustic signal at a second point farther from the acoustic signal output device than a predetermined first point where the first acoustic signal arrives is a predetermined value smaller than the attenuation rate of the acoustic signal due to air propagation at the second point relative to the first point; Is designed to be: an attenuation amount of the first acoustic signal at the second point relative to the first point, a predetermined value greater than the attenuation of the acoustic signal due to air propagation at the second point relative to the first point; An acoustic signal output device designed to satisfy the above. [Item 25] a first sound hole or holes for emitting a first acoustic signal to the outside; and a structural portion including an outer surface area surrounding an open end of the first sound hole or holes; When the structure is attached to the body, a portion of the outer surface region is supported in contact with any part of the body; At least a part of the open end of the first sound hole does not come into contact with the body, The first acoustic signal emitted from the first sound hole is configured to be guided toward the ear canal. Acoustic signal output device. [Item 26] The acoustic signal output device of item 25, When the structure is attached to the body, An acoustic signal output device designed so that the sound pressure level of the first acoustic signal emitted from the structural part toward the ear canal is higher than the sound pressure level of the first acoustic signal emitted from the structural part toward a side other than the ear canal. [Item 27] 27. The acoustic signal output device of item 25 or 26, the structure is further provided with one or more second sound holes for emitting a second acoustic signal to the outside, When the first acoustic signal is emitted from the first sound hole and the second acoustic signal is emitted from the second sound hole, the attenuation rate of the first acoustic signal at a second point farther from the acoustic signal output device than a predetermined first point where the first acoustic signal arrives is a predetermined value smaller than the attenuation rate of the acoustic signal due to air propagation at the second point relative to the first point; Is designed to be: an attenuation amount of the first acoustic signal at the second point relative to the first point, a predetermined value greater than the attenuation of the acoustic signal due to air propagation at the second point relative to the first point; An acoustic signal output device designed to satisfy the above.

[0099] [Item 31] a structural section provided with one or more first sound holes for emitting a first acoustic signal to the outside, a hollow section for emitting a second acoustic signal into an internal space, and one or more second sound holes for emitting the second acoustic signal emitted into the internal space of the hollow section to the outside, An acoustic signal output device designed so that the resonant frequency of the hollow portion is equal to or higher than a predetermined frequency, and so that the second acoustic signal, in which frequency band components including the predetermined frequency are suppressed, is emitted to the outside from the second sound hole. [Item 32] The acoustic signal output device of item 31, the structural portion includes an internal hollow portion disposed in an internal space of the hollow portion, An acoustic signal output device, wherein the internal space of the internal hollow portion is spatially separated from the internal space of the hollow portion located outside the internal hollow portion. [Item 33] The acoustic signal output device of item 32, further comprising an electronic component for driving a driver unit that emits at least one of the first acoustic signal and the second acoustic signal; An acoustic signal output device, wherein at least a portion of the electronic component is accommodated in the internal space of the internal hollow portion. [Item 34] The acoustic signal output device of item 32, Further, a buffer material is disposed between the outside of the internal hollow portion and the inside of the hollow portion, An acoustic signal output device, wherein the outside of the internal hollow portion is fixed to the inside of the hollow portion via the buffer material. [Item 35] The acoustic signal output device of item 31, The acoustic signal output device further includes a driver unit that emits the second acoustic signal, in which frequency band components including the predetermined frequency are suppressed, into the internal space of the hollow portion. [Item 36] The acoustic signal output device of item 35, An acoustic signal output device further comprising a switching unit that switches between whether the driver unit emits the second acoustic signal in which frequency band components including the specified frequency are suppressed into the internal space of the hollow portion, or whether the driver unit emits the second acoustic signal in which frequency band components including the specified frequency are not suppressed into the internal space of the hollow portion. [Item 37] The acoustic signal output device of item 31, When the first acoustic signal is emitted from the first sound hole and the second acoustic signal is emitted from the second sound hole, the attenuation rate of the first acoustic signal at a second point farther from the acoustic signal output device than a predetermined first point where the first acoustic signal arrives is a predetermined value smaller than the attenuation rate of the acoustic signal due to air propagation at the second point relative to the first point; Is designed to be: an attenuation amount of the first acoustic signal at the second point relative to the first point, a predetermined value greater than the attenuation of the acoustic signal due to air propagation at the second point relative to the first point; An acoustic signal output device designed to satisfy the above. [Explanation of symbols]

[0100] 10,20,30,3100,4100,4200,5110,5120,5130,5140,5150,5160,5170,5190,5200-5600,6100-6300 Acoustic signal output device 5 111 ,5 121,5131,5151,5171,5191,5201,5781 Structural part 121a,123a sound hole 11 Driver unit 210 Switching section 220 Hollow part 241 Internal hollow part 1000 users 1010,1020 Auricle 1011,1021 External auditory canal

Claims

1. An acoustic signal output device, a structural portion provided with one or more first sound holes for emitting a first acoustic signal to the outside and one or more second sound holes for emitting a second acoustic signal to the outside, the first sound hole is disposed at an eccentric position displaced in a first direction from a central axis of the structural portion, a sound pressure level of the second acoustic signal emitted from the second sound hole into the first space is lower than a sound pressure level of the second acoustic signal emitted from the second sound hole into the second space, the first space is a space located on a first direction side with respect to the first sound hole, the second space is a space located on a second direction side with respect to the first sound hole, and the second direction includes a component in a direction opposite to the first direction, When the first acoustic signal is emitted from the first sound hole and the second acoustic signal is emitted from the second sound hole, an attenuation rate of the first acoustic signal at a second point farther from the acoustic signal output device than a predetermined first point where the first acoustic signal arrives is a predetermined value smaller than the attenuation rate of the acoustic signal at the second point relative to the first point due to air propagation; Is designed to be: an attenuation amount of the first acoustic signal at the second point relative to the first point, a predetermined value greater than the attenuation of the acoustic signal due to air propagation at the second point relative to the first point; It is designed to be more than Acoustic signal output device.

2. 2. The acoustic signal output device of claim 1, an acoustic signal output device, wherein a total area of ​​the open ends of the second sound holes facing the first space is smaller than a total area of ​​the open ends of the second sound holes facing the second space.

3. 3. The acoustic signal output device according to claim 1, a plurality of second sound holes are provided in the structural portion, an acoustic signal output device, wherein the sound pressure level of the second acoustic signal emitted from one of the opening ends of the second sound hole that faces the first space is lower than the sound pressure level of the second acoustic signal emitted from the other of the opening ends of the second sound hole that faces the second space.

4. 2. The acoustic signal output device of claim 1, At least a portion of an outer surface area surrounding the open end of the first sound hole has a convex shape, An acoustic signal output device, wherein the outer surface area includes a first area and a second area that protrudes further than the first area, and is configured in a shape that guides a first acoustic signal emitted from a first sound hole toward the first area.

5. 5. The acoustic signal output device of claim 4, an open end of the first sound hole faces a space surrounded by the second area, An acoustic signal output device, wherein the first area side of the space surrounded by the second area is open to the outside of the outer periphery of the space surrounded by the second area.

6. 6. The acoustic signal output device according to claim 4 or 5, The first area is disposed on the first direction side of the second area.

7. 6. The acoustic signal output device according to claim 4 or 5, When the structure is attached to the body, the second region is supported in contact with any part of the body; the open end of the first sound hole and the first area do not come into contact with at least a part of the body, The first region is disposed on the ear canal side. The acoustic signal output device is configured as follows.

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