Acoustic device

Abstract

To provide an acoustic device capable of effectively transmitting a sound wave of which a streak of a three-dimensional net structure body is a medium to a human body.SOLUTION: An acoustic device includes: a three-dimensional net structure in which a streak formed by a resin with an elastic property is randomly looped or curled, is fused to each other, and is aggregated so as to be entangled; at least one speaker that generates a sound wave; and a plate-like resonance plate. The speaker squeezes a vibration part facing an inner surface of the three-dimensional net structure. A front surface side member, an intermediate member, and an inner side member are provided sequentially toward a back surface that is separated from a front surface from an inner surface so as to face the front surface from the front surface. The front surface member is harder than the intermediate member, and the inner side member is harder than the front surface member.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to an acoustic device.

Background Art

[0002] An acoustic system in which a speaker is incorporated into a cushion such as a chair is known. Patent Document 1 below describes an acoustic system configured to transmit sound waves of a speaker to the back of the upper body of a human body through a three-dimensional network structure composed of linearly shaped thermoplastic resin that is randomly curved or looped.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the acoustic system described in this Patent Document 1, sound waves of the speaker are transmitted to the human body (especially the back) through the linearly shaped members constituting the three-dimensional network structure, resulting in a state similar to the case where vibrations by the strings of a musical instrument are directly transmitted to the human body. Compared with the case of perceiving only sounds with air as the medium, a deeper psychosomatic relaxation effect can be obtained.

[0005] However, sound waves generated by the speaker are propagated not only through the three-dimensional network structure but also to the case or housing to which the speaker is attached. In the acoustic system described in Patent Document 1, if the propagation of sound waves by members other than such a three-dimensional network structure is not considered, the propagation of sound waves to parts other than the back by these members and the propagation of sounds with air as the medium are likely to occur, and the above-described relaxation effect due to the propagation of sound waves with the linearly shaped members of the three-dimensional network structure to the human body (especially the back) is likely to be reduced.

[0006] The present invention has been made in view of such circumstances, and an object thereof is to provide an acoustic device capable of effectively propagating sound waves using the filaments of a three-dimensional network structure to the human body.

Means for Solving the Problems

[0007] The acoustic device of the present invention is an acoustic device that transmits sound waves to the human body, and has a three-dimensional network structure in which filaments formed of an elastic resin are randomly looped or curled, fused to each other, and intertwined and aggregated, at least one speaker that generates the sound waves, and a plate-shaped resonance plate. The three-dimensional network structure includes a surface that directly or indirectly contacts the human body and an inner surface facing the surface. The speaker includes a vibration part facing the inner surface of the three-dimensional network structure and a frame part that holds the vibration part so as to be vibratable. The frame part is attached to one surface of the resonance plate via an elastic attachment material. The three-dimensional network structure is provided with a surface-side member, an intermediate member, and an inner-side member in order from the surface toward the back surface facing the surface and separated from the surface more than the inner surface. The surface-side member is harder than the intermediate member, and the inner-side member is harder than the surface-side member.

[0008] Preferably, the three-dimensional network structure includes an inner surface that surrounds the periphery of the speaker between the inner surface and the back surface, and the speaker is housed in an internal space surrounded by the inner surface and the inner side surface of the three-dimensional network structure and one surface of the resonance plate.

[0009] Preferably, the inner surface is located within the intermediate member.

[0010] Preferably, the thicknesses of the intermediate member and the inner-side member are substantially the same.

[0011] Preferably, the surface member is thinner than the intermediate member and the inner-side member.

[0012] Preferably, the surface side member (71) is formed of a hollow linear body, the intermediate member (81) is formed of a non-hollow linear body, and the inner side member (72) is formed of a non-hollow linear body, and the outer diameter of the linear body is smaller than that of the surface side member.

[0013] Preferably, the distance between the speaker and the inner surface is 1 / 10 to 1 / 5 of the thickness of the intermediate member.

[0014] Preferably, the back surface of the three-dimensional network structure is attached to one surface of the resonance plate via the attachment material.

[0015] Preferably, the attachment material is a thermoplastic elastomer containing ethylene vinyl acetate copolymer or glue.

[0016] Preferably, the frame portion includes a circular flat bottom surface, a recess is formed at the center of the bottom surface, and the frame portion is attached to one surface of the wooden board via the attachment material filled in the recess and at least a part of the outer edge portion of the bottom surface.

[0017] Preferably, it has a plurality of the speakers, the resonance plate includes a plurality of the wooden boards corresponding one-to-one to the plurality of the speakers and a plate member to which the plurality of the wooden boards are attached, the frame portion of each speaker is attached to one surface of the corresponding wooden board via the attachment material, and the other surface of the wooden board facing the one surface of the wooden board attached to the frame portion is attached to one surface of the plate member via the attachment material.

Advantages of the Invention

[0018] According to the present invention, it is possible to provide an acoustic device capable of effectively propagating sound waves using the stripes of the three-dimensional network structure as a medium to the human body.

Brief Description of the Drawings

[0019]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

[0020] The inventor of the present application who developed the acoustic system of Patent Document 1 described above paid attention to the importance of sound waves transmitted to members other than the three-dimensional network structure during the intensive research to develop an acoustic system with a higher relaxation effect on the mind and body and a health promotion effect. Then, the inventor of the present application made various efforts regarding the member for fixing the speaker, the fixing method thereof, the method for controlling the sound waves transmitted to the floor surface, etc., so that the sound waves using the filaments of the three-dimensional network structure as a medium can be effectively transmitted to the human body. As a result, the present invention was conceived.

[0021] Hereinafter, the acoustic system according to the embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing an example of the configuration of the acoustic system according to the present embodiment. The acoustic system according to the present embodiment is a system having a support surface that supports the back (especially the back) of the upper body of a human body and is configured to transmit sound waves from the support surface to the human body, and is applicable to, for example, a chair or a bed. The acoustic system 1 shown in FIG. 1 is an example of the present embodiment applied to a chair.

[0022] As shown in Fig. 1, this acoustic system 1 includes a main body 3 having a support surface 330 that supports at least the back of the human body, and a plate-shaped laying member 4 on which the main body 3 is placed. The main body 3 is a sofa-type chair, and includes a seat 31 that supports the buttocks, a seat cushion 32 provided on the upper surface of the seat 31, a backrest 33 that supports the back, two side portions 34 that sandwich and support the seat 31 from both left and right sides, armrests 35 provided on the upper surfaces of the two side portions 34 respectively, and a footrest 36 that protrudes obliquely downward on the front side of the seat 31.

[0023] As shown in Fig. 2, an acoustic device 2 that transmits sound waves to the human body on the support surface 330 is incorporated in the backrest 33 of the main body 3. Fig. 2 is a view showing a state in which the acoustic device 2 is removed from the backrest 33 of the main body 3. The backrest 33 has a holding portion 331 for holding the acoustic device 2. In the example of Fig. 2, the holding portion 331 includes a hole 332 that penetrates from the front side to the back side of the backrest 33, and a support frame 333 provided at the opening on the back side of the hole 332. As shown in Fig. 1, the acoustic device 2 is fitted into the hole 332. The support frame 333 supports the outer surface of the acoustic device 2 fitted in the hole 332 from the back side. In the example of Fig. 2, a plurality of rod-shaped support frames 333 span the opening on the back side of the hole 332 in the horizontal direction.

[0024] As shown in Fig. 2, a buffer member 334 is provided at a portion of each support frame 333 that contacts the acoustic device 2. The buffer member 334 is formed of an elastic material such as glass wool, for example. Also, the hole 332 in the backrest 33 that contacts the acoustic device 2 is an elastic cushion that elastically sandwiches and holds each side surface of the acoustic device 2. That is, the holding portion 331 of the backrest 33 holds the acoustic device 2 by elastic members (the buffer member 334 and the cushion of the hole 332).

[0025] By holding the acoustic device 2 with the holding portion 331 of the main body portion 3 by an elastic member, it becomes difficult for the sound waves generated by the speakers 5A to 5G (to be described later) of the acoustic device 2 to directly reach the main body portion 3. As a result, the sound waves generated by these speakers are more likely to reach the human body via the three-dimensional network structure 7 (to be described later).

[0026] FIG. 3A is a diagram showing an example of the appearance of the acoustic device 2 according to the present embodiment. In the example of FIG. 3A, the acoustic device 2 generally has a rectangular parallelepiped shape. When the acoustic device 2 is incorporated into the backrest portion 33, one of the outer surfaces of the acoustic device 2 becomes the support surface 330 and supports the back of the human body. The acoustic device 2 has a storage bag 21 that houses each component inside and covers the outside. This storage bag 21 is formed of, for example, cloth, and the portion corresponding to the support surface 330 is formed of a mesh fabric.

[0027] The acoustic device 2 has seven speakers 5A to 5G in the example of FIG. 3A. The seven speakers 5A to 5G are each arranged to emit sound waves from the support surface 330 to the outside. Among the seven speakers 5A to 5G, six speakers 5A to 5F (hereinafter, may be referred to as "speaker 5" without distinction) are of the same type, and only the speaker 5G is a low-frequency speaker that is larger in size than the other speakers 5. The six speakers 5 are divided into two rows arranged in the horizontal direction when viewed from a direction perpendicular to the support surface 330, and three speakers 5 are arranged in the vertical direction in each row. The low-frequency speaker 5G is located approximately in the middle in the horizontal direction between the two rows of speakers 5, and is located below the speakers 5 in the vertical direction. When the user sits on the main body portion 3 in a normal posture, the two rows of speakers 5 are located on both sides of the spine, and the low-frequency speaker 5G is located near the spine on the pelvic side.

[0028] FIG. 3B is a cross-sectional view showing an example of the structure of the acoustic device 2, and shows a cross-section when the speaker 5 is cut by a plane perpendicular to the support surface 330. As shown in FIG. 3B, the acoustic device 2 has a three-dimensional network structure 7 that is a collection of linear elements 70 and a plate-shaped resonance plate 6.

[0029] The three-dimensional network structure 7 is formed by randomly looping or curling linear strips 70 made of an elastic resin, which are fused to each other, intertwined, and aggregated. The resin used as the raw material for the linear strips 70 is, for example, a thermoplastic resin, such as a general-purpose plastic (polyolefin, polystyrene-based resin, methacrylic resin, polyvinyl chloride, etc.), an engineering plastic (polyamide, polycarbonate, saturated polyester, polyacetal, etc.), and the like. The thermoplastic resin is preferably a thermoplastic elastomer. Particularly preferred thermoplastic elastomers include polyolefin-based resins such as polyethylene (PE) and polypropylene (PP), vinyl acetate resin (VAC), ethylene-vinyl acetate copolymer (EVA), or styrene-butadiene-styrene (SBS), etc., and mixtures thereof may also be used. The thermoplastic resin is not limited to newly purified resin, and recycled resin may also be used.

[0030] When forming the linear strips 70 by mixing a polyolefin-based resin and a vinyl acetate-based resin such as VAC or EVA, the mixing ratio is polyolefin-based resin:vinyl acetate-based resin = 70 to 97 wt%:3 to 30 wt%, preferably 80 to 90 wt%:10 to 20 wt%. This is because when VAC or EVA is 3 wt% or less, the resilience decreases, and when it exceeds 30 wt%, the thermal properties deteriorate.

[0031] When forming the linear strips 70 by mixing a polyolefin-based resin and SBS, the mixing ratio is polyolefin-based resin:SBS = 50 to 97 wt%:3 to 50 wt%, preferably 70 to 90 wt%:10 to 30 wt%.

[0032] All or part of the linear strips 70 constituting the three-dimensional network structure 7 may be hollow, solid (non-hollow), or a mixture of both. From the perspective of weight reduction, etc., the linear strips 70 are preferably hollow. By making the linear strips 70 have a hollow structure, compared with solid linear strips 70 of the same diameter, the thickness of the resin part can be reduced, so that vibrations with particularly high frequencies are more easily transmitted. That is, the hollow linear strips 70 have higher rigidity and less vibration attenuation.

[0033] When the pure line 70 and the hollow line 70 are mixed, the mixing ratio thereof is preferably pure:hollow = 0 to 50:50 to 100.

[0034] For the pure line 70, the wire diameter (diameter) can be 0.3 to 3.0 mm, preferably 0.7 to 1.0 mm. In the case of the pure line 70, if the wire diameter is 0.3 mm or less, the line 70 becomes weak, there are many fused parts, and the porosity decreases. If it is 3.0 mm or more, the line 70 becomes strong, it is difficult to form a loop, the number of fused parts decreases, and the strength decreases.

[0035] On the other hand, for the hollow line 70, the wire diameter of the line 70 can be 1.0 to 3.0 mm, preferably 1.5 to 2.0 mm, and particularly preferably 0.9 to 1.3 mm. The hollow line 70 preferably has a porosity of 10% to 80%. This is because if the porosity is 10% or less, it does not contribute to weight reduction, and if it is 80% or more, the cushioning property decreases. Note that the hollow portions formed in the line 70 do not have to be continuous.

[0036] From the viewpoint of reducing the weight while having the elasticity and strength required for a cushion, the three-dimensional network structure 7 preferably has a predetermined bulk density and porosity. Here, the porosity is [Porosity (%)] = (1 - [Bulk density] / [Density of resin]) × 100 is.

[0037] As shown in FIG. 3B, in the three-dimensional network structure 7, for example, from the front surface 73 toward the back surface 75, the front surface side member 71, the intermediate member 81, and the inner member 72 are arranged in this order. The front surface side member 71 is a hollow fiber, the intermediate member 81 is an ultra-fine straw fiber (ultra-fine network structure cushion), and the inner member 72 is a straw fiber (network structure cushion). The front surface side member 71 is composed of a hollow linear body. By making the front surface side member 71 hollow, the sound diffused by the intermediate member 81 can be concentrated and transmitted to the surface. The intermediate member 81 is composed of a non-hollow linear body (ultra-fine mesh structure cushion (extra mesh fiber)). The inner member 72 is composed of a non-hollow linear body (multi-mesh structure cushion (multi-mesh fiber)), and the outer diameter of the linear body is smaller than that of the surface-side member 71.

[0038] The thicknesses of the intermediate member 81 and the inner member 72 are substantially the same, for example, about 50 mm. The thickness of the surface-side member 71 is thinner than those of the intermediate member 81 and the inner member 72, for example, about 40 mm. The surface-side member 71 is harder than the intermediate member 81. Also, the inner member 72 is harder than the surface-side member 71.

[0039] Specifically, the surface-side member 71 is a hollow straw fiber with a diameter (outer diameter) of 2.0 mm, the bulk density is 0.2 to 0.5 g / cm3, preferably 0.3 to 0.4 g / cm3, and the porosity is 44 to 77%, preferably 56 to 67%. The intermediate member 81 is an ultra-fine mesh structure cushion with a diameter of 0.6 mm, the bulk density is 0.01 to 0.15 g / cm3, preferably 0.03 to 0.05 g / cm3, and the porosity is 83 to 99%, preferably 94 to 97%. The inner member 72 is a mesh structure cushion with a diameter of 1.0 mm, the bulk density is 0.2 to 0.5 g / cm3, preferably 0.3 to 0.4 g / cm3, and the porosity is 44 to 77%, preferably 56 to 67%.

[0040] The inner member 72 has a bulk density and porosity range similar to that of the surface-side member 71, but since it is non-hollow, it is harder than the surface-side member 71. Since the outer diameter of the inner member 72 is smaller than that of the surface-side member 71, the diffusion of sound is large and the reverberation increases in a more concentrated form.

[0041] The inner surface 74 is located on the intermediate member 81. By positioning the inner surface 74 within the softer intermediate member 81 as compared to the surface-side member 71 and the inner member 72, the sound from the speaker 5 can be efficiently taken into the intermediate member 81 and transmitted as soft sound toward the support surface 330, as compared to the case where the same material as the inner member 72 is provided in the region of the intermediate member 81. That is, by making the surface-side member 71 harder than the intermediate member 81, the sound can be diffused toward the support surface 330 while being amplified within the surface-side member 71 which is a straw-shaped fiber. In addition, since the armrest portion on the side of the back of the acoustic system (chair) makes a rattling sound like a musical instrument, it resonates more and can output waves to the front. By making the surface-side member 71 softer than the inner member 72, the cushioning property of the support surface 330 that supports the human body can be improved. By providing the intermediate member 81 which is lower than the surface-side member 71 between the surface-side member 71 and the inner member 72, softer sound can be diffused and a cushioning property with a certain degree of hardness can be realized as compared to the case where the intermediate member 81 is not provided. In addition, since the inner member 72 is hard, the stability of the device can be ensured.

[0042] The distance H between the upper end 87 of the speaker 5 and the inner surface 74 is 1 / 10 to 1 / 5 of the thickness of the intermediate member 81. By securing the distance H sufficiently, the sound from the speaker 5 spreads and is widely and uniformly transmitted to the entire support surface 330.

[0043] The back surface 75 of the inner member 72 is attached to one surface of the resonance plate 6 via an attachment material.

[0044] By increasing the bulk density of the outer layer, the bonding force between the filaments 70 is strengthened, so that the pressure when an external force is applied is easily dispersed, and it is difficult to apply a large external force to the speakers 5A to 5G arranged inside the three-dimensional network structure 7. In addition, by increasing the bulk density of the inner member 72, the unevenness of the back surface 75 is reduced and it becomes smooth, so that the three-dimensional network structure 7 and the resonance plate 6 can be stably attached via the attachment material 8 described later.

[0045] The thickness of the three-dimensional network structure 7 is not particularly limited as long as it can exhibit the strength and elasticity necessary to support the human body, but it is set to at least the thickness necessary to incorporate the speakers 5A to 5G in the three-dimensional network structure 7. The three-dimensional network structure 7 can be formed into an arbitrary shape and size by methods such as shearing, mechanical cutting, and hot pressing.

[0046] As shown in FIG. 3B, the three-dimensional network structure 7 has a surface 73 that indirectly contacts the human body via the support surface 330 of the storage bag 21, and an inner surface 74 that faces the surface 73. The inner surface 74 faces the vibration part 51 of the speaker 5 described later.

[0047] Also, as shown in FIG. 3B, the three-dimensional network structure 7 has a back surface 75 that faces the surface 73. The back surface 75 is farther from the surface 73 than the inner surface 74, and is attached to one surface 611 of the resonance plate 6 via the attachment material 8.

[0048] Furthermore, as shown in FIG. 3B, the three-dimensional network structure 7 has an inner surface 76 that surrounds the periphery of the speaker 5 between the inner surface 74 and the back surface 75. The speaker 5 is housed in an internal space surrounded by the inner surface 74 and the inner surface 76 of the three-dimensional network structure 7 and the surface 611 of the resonance plate 6.

[0049] The inner member 72 has through holes for arranging the speakers 5A to 5G. The through holes of the inner member 72 where the speakers 5 are located form an inner surface 76 that surrounds the periphery of the speakers 5. The surface-side member 71 forms an internal space 83 by closing the openings on the support surface 330 side of each through hole. The surface of the surface-side member 71 closer to the support surface 330 is the above-described surface 73, and the surface of the surface-side member 71 on the opposite side of the surface 73 (the surface facing the surface 73) is the above-described inner surface 74. The inner surface 74 of the intermediate member 81 faces the vibration part 51 of the speaker 5 arranged in the internal space 83 having this through hole.

[0050] FIG. 4A is a cross-sectional view showing an example of the structure of the speaker 5. The speaker 5 includes a vibrating portion 51 facing the inner surface 74 of the three-dimensional network structure 7, and a frame portion 52 that holds the vibrating portion 51 in a vibratable manner. In the example of FIG. 4A, the vibrating portion 51 includes a conical diaphragm 511 and a voice coil 512 attached near the central portion of the diaphragm 511. The side closer to the central portion of the diaphragm 511 is connected to the frame portion 52 by a ring-shaped support portion 53. The side closer to the outer edge of the diaphragm 511 is connected to the frame portion 52 by a ring-shaped support portion 54 having a diameter larger than that of the support portion 53. The support portion 53 and the support portion 54 are each elastically deformable and allow the vibration of the diaphragm 511 with respect to the frame portion 52. Inside the voice coil 512, a cylindrical yoke 55 is disposed. The frame portion 52 is made of the same magnetic material as the yoke 55, and a magnetic flux is generated by the magnet 56 between the yoke 55 and the frame portion 52. When this magnetic flux acts on the current of the voice coil 512 located between the frame portion 52 and the yoke 55, an electromagnetic force corresponding to the audio signal superimposed on the current acts on the voice coil 512, and the diaphragm 511 vibrates according to the audio signal. The vibration direction of the diaphragm 511 is a direction substantially perpendicular to the surfaces 73 and 74 of the three-dimensional network structure 7, which are planes substantially parallel to each other.

[0051] In the example of FIG. 4A, the frame portion 52 has a generally circular flat bottom surface 521. A recess 522 is formed at the center of the bottom surface 521.

[0052] FIG. 4B is a view showing a state in which the speaker 5 is attached to the resonance plate 6. As shown in FIG. 4B, the frame portion 52 of the speaker 5 is attached to one surface 611 of the resonance plate 6 via an elastic attachment material 8. The attachment material 8 preferably has appropriate elasticity even in a cured state, and for example, a thermoplastic elastomer containing ethylene vinyl acetate copolymer (EVA), glue, etc. is preferable.

[0053] By attaching the resonance plate 6 to the frame portion 52 via the elastic attachment material 8, it is possible to make it difficult for sound waves (especially high-frequency components) to propagate from the frame portion 52 to the resonance plate 6 compared to the case where they are connected and fixed by bolts or the like. Therefore, the sound waves (relatively high-frequency components) generated by the speaker 5 can be effectively propagated from the wire strips 70 of the three-dimensional network structure 7 to the human body.

[0054] In addition, the relatively low-frequency sound waves propagating from the frame portion 52 to the resonance plate 6 via the attachment material 8 are likely to resonate in the resonance plate 6 having a width and height of a size (about several cm to several tens of cm) that can be easily arranged facing the back of the human body. Therefore, they are amplified by the resonance plate 6 and easily transmitted to the three-dimensional network structure 7. Accordingly, even the relatively low-frequency sound waves generated by the speaker 5 can be effectively propagated from the wire strips 70 of the three-dimensional network structure 7 to the human body. In particular, by attaching the back surface 75 of the three-dimensional network structure 7 to the surface 611 of the resonance plate 6 with the attachment material 8, the sound waves amplified by the resonance plate 6 are easily transmitted to the three-dimensional network structure 7, so that the sound waves can be transmitted more effectively from the three-dimensional network structure 7 to the human body.

[0055] In the example of FIG. 4B, the resonance plate 6 is composed of a wooden plate 61. As the material of the wooden plate 61, for example, plywood such as lumber core can be used. The frame portion 52 of each speaker 5 is attached to one surface 611 of the wooden plate 61 via the attachment material 8.

[0056] The frame part 52 is attached to one surface 611 of the wooden board 61 via, for example, the attachment material 8 contained in the recess 522 of the bottom surface 521 and the attachment material 8 contained in at least a part of the outer edge part 523 of the bottom surface 521 as shown in FIG. 4B. By containing the attachment material 8 in the recess 522 of the bottom surface 521, it is possible to surely prevent the central part of the bottom surface 521 of the frame part 52 from directly contacting the surface 611 of the wooden board 61. Further, since the range of attachment to the surface 611 of the wooden board 61 can be easily controlled at the outer edge part 523 of the bottom surface 521, it becomes easier to adjust the intensity, frequency, etc. of the sound wave transmitted from the frame part 52 to the resonance plate 6.

[0057] FIG. 5 is a view showing an example of the resonance plate 6 (wooden board 61) to which a plurality of speakers (5A to 5G) are attached, and is a view seen from a direction perpendicular to the flat surface of the resonance plate 6 (wooden board 61). The planar shape of the wooden board 61 shown in FIG. 5 is rectangular. In one example, the size of the wooden board 61 is 400 mm in width, 650 mm in length, and 13 mm in thickness, and a plurality of speakers (5A to 5G) are attached to one wooden board 61.

[0058] FIG. 6 is a cross-sectional view showing an example of the structure of the laying member 4 on which the main body part 3 is placed, and shows a cross-section cut along a plane in the vertical direction. The laying member 4 has, for example, as shown in FIG. 6, a first plate member 41 and a second plate member 42 which are each plate-shaped members, and a buffer member 43. The second plate member 42 is disposed below the first plate member 41, and the buffer member 43 is inserted between the first plate member 41 and the second plate member 42. The first plate member 41 is a wooden plate member such as plywood. In one example, the thickness of the first plate member 41 is 55 mm. The buffer member 43 is formed of an elastic material such as glass wool or rock wool. In one example, the thickness of the buffer member 43 is 20 mm. In one example, the planar shapes of the first plate member 41 and the second plate member 42 are rectangles of the same size, with the length of the vertical side being 800 mm and the length of the horizontal side being 840 mm. The upper surface of the first plate member 41 is covered with a cover member 44 such as a carpet.

[0059] A part of the sound waves generated by the speakers 5A to 5G of the audio device 2 propagates to the floor member 4 through the main body 3 and the human body. However, since the first plate member 41 of the floor member 4 is supported by the lower second plate member 42 via the buffer member 43 and the entire first plate member 41 is likely to vibrate with respect to the second plate member 42 and the floor surface, it is possible to make it difficult for sound waves to propagate from the first plate member 41 to the floor surface. Further, when the first plate member 41 vibrates due to sound waves (especially low-frequency components), this vibration is easily transmitted to the human body through the toes touching the floor member 4 or the main body 3, and a comfortable vibration caused by the sound waves generated by the audio device 2 can be given to the entire body of the user.

[0060] As shown in FIG. 6, for example, the second plate member 42 includes a wooden upper plate member 421 facing the buffer member 43, a wooden lower plate member 422 disposed below the upper plate member 421, and an elastomer sheet 423 inserted between the upper plate member 421 and the lower plate member 422. In one example, the upper plate member 421 is a medium-density fiberboard (MDF) with a thickness of 12 mm, the lower plate member 422 is a particle board with a thickness of 20 mm, and the elastomer sheet 423 is a rubber sheet with a thickness of 3 mm. According to such a structure, since the propagation of vibration from the upper plate member 421 to the lower plate member 422 can be suppressed by the elastomer sheet 423 such as rubber, it is possible to make it difficult for the vibration of the first plate member 41 due to sound waves to propagate to the floor surface.

[0061] As described above, with the structure shown in FIG. 3, the audio system 1 can diffuse the sound from the speaker 5 in the internal space 83 and efficiently diffuse it while making it a soft sound in the intermediate member 81. Also, the hard inner member 72 can stably hold the shape of the internal space 83.

[0062] When using the above-described audio system 1, the user sits on the seat portion 31 of the main body 3 with the back against the support surface 330 and generates sound waves such as music and environmental sounds from the speakers 5A to 5G. At this time, by lowering the frequency of the sound waves for the speakers 5 located below the back, a physiological pleasure and a massage effect can be obtained.

[0063] According to the present embodiment, by attaching the resonance plate 6 to the frame portion 52 of the speaker 5 via the elastic attachment material 8, it is possible to make it difficult for high-frequency sound waves to propagate from the frame portion 52 to the resonance plate 6, and it is possible to make it easy for low-frequency sound waves propagated from the frame portion 52 to the resonance plate 6 to resonate in the resonance plate 6. Therefore, sound waves can be effectively propagated from the wire strips 70 of the three-dimensional network structure 7 to the human body.

[0064] Further, according to the present embodiment, the first plate member 41 of the floor member 4 is supported by the lower second plate member 42 via the buffer member 43, and the entire first plate member 41 is likely to vibrate with respect to the second plate member 42 and the floor surface. Therefore, vibrations caused by sound waves generated by the acoustic device 2 can be transmitted to the whole body.

[0065] Furthermore, according to the present embodiment, since the holding portion 331 of the main body portion 3 holds the acoustic device 2 by an elastic member, it becomes difficult for sound waves generated by the speaker 5 of the acoustic device 2 to propagate to the main body portion 3 side. Therefore, it becomes easy to propagate sound waves using the wire strips 70 of the three-dimensional network structure 7 as a medium to the human body.

[0066] Note that the present invention is not limited only to the above-described embodiment and includes various variations.

[0067] For example, in the above-described embodiment, seven speakers (5A to 5G) are provided in the acoustic device 2, but the number of speakers may be six or less or eight or more. Also, the type of speaker in the acoustic device is not limited to the cone type as shown in FIG. 4B, and other types of speakers may be used.

[0068] The sizes, materials, materials, etc. of the respective members described in the above-described embodiment are merely examples and can be changed as appropriate.

Explanation of Reference Numerals

[0069] 1... Audio system, 2... Audio device, 21... Storage bag, 3... Main body, 31... Seat part, 32... Seat cushion, 33... Backrest part, 330... Support surface, 331... Holding part, 332... Hole, 333... Support frame, 334... Buffer member, 34... Side part, 35... Armrest part, 36... Footrest part, 4... Laying member, 41... First plate member, 42... Second plate member, 421... Upper side plate member, 422... Lower side plate member, 423... Elastomer sheet, 43... Buffer member, 44... Cover member, 5... Speaker, 5A~5G... Speakers, 51... Vibration part, 511... Diaphragm, 512... Voice coil, 52... Frame part, 521... Bottom surface, 522... Recess, 523... Outer edge part, 53,54... Support parts, 55... Yoke, 56... Magnet, 57... Protection cover, 6... Resonance plate, 61... Wood board, 611... Surface, 62A~62F,62... Wood boards, 621,622... Surfaces, 63... Plate member, 631... Surface, 64... Metal plate, 641,642... Surfaces, 7... Three-dimensional network structure, 70... Wire, 71... Surface side member, 72... Inner member, 73... Surface, 74,77... Inner surfaces, 75... Back surface, 76... Inner side surface, 8... Mounting material, 81... Intermediate member

Claims

1. An acoustic device for transmitting sound waves to a human body, comprising: a three-dimensional network structure in which linear strips formed of an elastic resin are randomly looped or curled, fused to each other, and intertwined and assembled; at least one speaker for generating the sound waves; a plate-shaped resonance plate, wherein the three-dimensional network structure includes a surface that directly or indirectly contacts the human body, and an inner surface facing the surface, wherein the speaker includes a vibrating portion facing the inner surface of the three-dimensional network structure, and a frame portion that holds the vibrating portion in a vibratable manner, wherein the frame portion is attached to one surface of the resonance plate via an elastic attachment material, wherein the three-dimensional network structure is provided with a surface-side member, an intermediate member, and an inner-side member in this order from the surface toward a back surface that faces the surface and is farther from the surface than the inner surface, the surface-side member is harder than the intermediate member, and the inner-side member is harder than the surface-side member acoustic device.

2. The three-dimensional network structure includes an inner surface that surrounds the periphery of the speaker between the inner surface and the back surface, and the speaker is housed in an internal space surrounded by the inner surface and the inner side surface of the three-dimensional network structure and one surface of the resonance plate The acoustic device according to claim 1.

3. The inner surface is located within the intermediate member The acoustic device according to claim 2.

4. The thicknesses of the intermediate member and the inner-side member are substantially the same The acoustic device according to claim 3.

5. The surface member is thinner than the intermediate member and the inner-side member The acoustic device according to claim 4.

6. The surface-side member is composed of a hollow linear body, the intermediate member is composed of a non-hollow linear body, and the inner-side member is composed of a non-hollow linear body having an outer diameter smaller than that of the surface-side member The acoustic device according to claim 5.

7. The distance between the speaker and the inner surface is 1 / 10 to 1 / 5 of the thickness of the intermediate member The acoustic device according to claim 6.

8. The back surface of the three-dimensional network structure is attached to one surface of the resonance plate via the attachment material, The acoustic device according to claim 7.

9. The attachment material is a thermoplastic elastomer containing ethylene vinyl acetate copolymer or glue The acoustic device according to claim 8. acoustic device.

10. The frame portion includes a circular flat bottom surface, and a concave portion is formed at the center of the bottom surface, ​ The frame portion is attached to one surface of the wooden board via the attachment material filled in the concave portion and at least a part of the outer edge portion of the bottom surface. The acoustic device according to claim 9.

11. Having a plurality of the speakers, The resonance board, A plurality of the wooden boards corresponding one-to-one to the plurality of the speakers, And a plate member to which the plurality of the wooden boards are attached, The frame portion of each speaker is attached to one surface of the corresponding wooden board via the attachment material, The other surface of the wooden board facing one surface of the wooden board attached to the frame portion is attached to one surface of the plate member via the attachment material. The acoustic device according to claim 10.

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