Vibration transmission device

Abstract

To provide a vibration transmission device that gives users a greater sense of realism. [Solution] The system includes a vibrating body 30, an exciter 20 that vibrates the vibrating body 30, a cushion portion 60 positioned at a distance from the vibrating body 30 and capable of elastic deformation, a partitioning member 12 that partitions an air chamber R1 between the opposing cushion surface 60X, which is the surface of the cushion portion 60 facing the vibrating body 30, and the vibrating body 30, and a covering portion 72 that covers at least a part of the outer surface of the cushion portion excluding the opposing cushion surface 60X and has lower breathability than the cushion portion 60, and the covering portion 72 is provided so as to partition a vibration space between the vibrating body 300 and the partitioning member 12 that includes the air chamber R1 and the inner space R2 of the cushion portion and transmits vibrations to the covering portion 72 via the internal air.

Description

Technical Field

[0001] The present disclosure relates to a technology for transmitting vibration to a user.

Background Art

[0002] Patent Document 1 discloses a speaker system including a cushion material and a speaker embedded in the cushion material.

Prior Art Literature

Patent Literature

[0003]

Patent Document 1

Summary of the Invention

Problem to be Solved by the Invention

[0004] In the prior art disclosed in Patent Document 1, vibration of a portion of the cushion material that is in contact with the speaker is larger than that of other portions. Therefore, a sufficient feeling of being enveloped, that is, a sense of presence cannot be provided to the user.

[0005] The present disclosure has been made to solve such problems, and an object of the present disclosure is to provide a technology that can provide a higher sense of presence to a user.

Means for Solving the Problem

[0006] A vibration transmission device according to one aspect of the present disclosure comprises a vibrating body, an exciter for vibrating the vibrating body, an elastically deformable cushion portion positioned at a distance from the vibrating body, a partitioning member for partitioning an air chamber between the vibrating body and an opposing cushion surface which is the surface of the cushion portion facing the vibrating body, and a covering portion which covers at least a portion of the outer surface of the cushion portion excluding the opposing cushion surface and has lower breathability than the cushion portion, wherein the covering portion partitions a vibration space between the vibrating body and the partitioning member, which includes the air chamber and the inner space of the cushion portion and transmits vibrations to the covering portion via the internal air. [Effects of the Invention]

[0007] According to this disclosure, it is possible to provide users with a greater sense of realism. [Brief explanation of the drawing]

[0008] [Figure 1] This is a schematic perspective view showing a seat to which the vibration transmission device according to the first embodiment of this disclosure is applied. [Figure 2] This is a schematic cross-sectional view of a vibration transmission device. [Figure 3] Figure 3 is a schematic cross-sectional view along the line III-III in Figure 2. [Figure 4] This is a schematic plan view showing an example of a partition member. [Figure 5] This is a schematic cross-sectional view illustrating the operation of a vibration transmission device. [Figure 6] This is a schematic cross-sectional view of a vibration transmission device in a second embodiment of the present disclosure. [Figure 7] This is a schematic cross-sectional view showing a modified example of the vibration transmission device in the second embodiment of this disclosure. [Figure 8] This is an enlarged view of a portion of a schematic cross-sectional diagram showing a modified example of the vibration transmission device in the first embodiment of this disclosure. [Modes for carrying out the invention]

[0009] (Knowledge forming the basis of this disclosure) In fields such as immersive video and audio systems, development is underway on devices that deliver vibrations to parts of the user's body other than their ears.

[0010] Patent Document 1 discloses a speaker system built into the headrest of a chair. In this speaker system, sound output from the speaker can be transmitted to the user via a cushioning material. However, as shown in Figure 3 of Patent Document 1, in this speaker system, the speaker is embedded in the cushioning material in a state where the front surface of the speaker is in contact with a part of the cushioning material. Therefore, even if the speaker in Patent Document 1 is simply configured to emit vibrations, as a portion of the vibration energy is directly applied to the cushioning material and transmitted through it, relatively strong vibrations are transmitted to the parts of the cushioning material and headrest surface that are close to the speaker, while insufficient vibrations are transmitted to the parts that are farther from the speaker, which may result in uneven vibration of the headrest surface. Furthermore, in the speaker system of Patent Document 1, the headrest surface is provided with a covering that has high sound transmittance, which makes it difficult to vibrate the entire headrest surface. Thus, the device in Patent Document 1 cannot transmit vibrations to the user while giving them a sufficient sense of being enveloped, or presence.

[0011] Therefore, the inventors focused on Pascal's principle, which states that the air pressure in a sealed space is uniform, and realized that by vibrating the air in a predetermined space and transmitting this vibration to the user, it is possible to provide the user with more uniform vibrations and give them a greater sense of presence. This led to the invention of this disclosure.

[0012] (1) A vibration transmission device in one aspect of the present disclosure comprises a vibrating body, an exciter for vibrating the vibrating body, a cushion portion disposed at a distance from the vibrating body and elastically deformable, a partitioning member that partitions an air chamber between the opposing cushion surface, which is the surface of the cushion portion facing the vibrating body, and the vibrating body, and a covering portion that covers at least a portion of the outer surface of the cushion portion excluding the opposing cushion surface and has lower breathability than the cushion portion, wherein the covering portion partitions a vibration space between the vibrating body and the partitioning member, which includes the air chamber and the inner space of the cushion portion and transmits vibrations to the covering portion via the internal air.

[0013] In this configuration, an air chamber is separated between the vibrating body and the cushion. Therefore, the pressure fluctuations within the air chamber generated during the vibration of the vibrating body can be made substantially uniform. Moreover, the cushion has higher breathability than the covering. As a result, the pressure fluctuations generated in the air chamber can be transmitted to the covering through the air inside the cushion, allowing a wide area of ​​the covering to vibrate uniformly. Consequently, with this configuration, by directly or indirectly bringing at least a part of the covering into contact with the user, the elastically deformable cushion can provide good support for the user's body, and vibrations can be transmitted more evenly over a wider area of ​​the user's body without increasing the size of the vibrating body, giving the user a high sense of being enveloped and present.

[0014] (2) In the vibration transmission device described in (1) above, the partition member is provided with a peripheral wall surrounding the vibrating body, and the vibrating body may have a vibrating body body connected to the vibrator and a sealing portion which is more flexible than the vibrating body body and closes the gap between the vibrating body body and the peripheral wall.

[0015] This configuration allows the seal to flex, thereby sealing the space between the vibrating body and the surrounding wall while enabling the entire vibrating body to vibrate more uniformly. As a result, pressure fluctuations within the air chamber and, consequently, vibrations in the covering can be made more uniform and transmitted more reliably and evenly to the user.

[0016] (3) The vibration transmitting device according to (1) or (2), may further comprise a partition member provided along the opposing cushion surface and having higher air permeability than the cushion portion.

[0017] According to this configuration, while the cushion portion is stably supported by the partition member, it is possible to prevent the partition member from inhibiting transmission of pressure fluctuations generated in the air chamber to the covering portion.

[0018] (4) The vibration transmitting device according to any one of (1) to (3), may further comprise a pressure adjusting device that adjusts the pressure of the vibration space.

[0019] According to this configuration, when a load is applied to the vibration transmitting device from a user or the like, it is possible to prevent the pressure in the vibration space from becoming excessive. Thereby, for example, bottoming of the vibrator caused by the excessive pressure can be prevented.

[0020] (5) In the vibration transmitting device according to (4), the pressure adjusting device may be an orifice formed in the partition member and communicating the vibration space with a space outside the vibration space.

[0021] According to this configuration, an excessive increase in pressure in the vibration space can be prevented with a simple configuration of providing an orifice.

[0022] (6) In the vibration transmitting device according to (4) or (5), the pressure adjusting device may comprise: a communication path that communicates the vibration space with a space outside the vibration space; an opening / closing valve that opens and closes the communication path; and an opening / closing valve support portion that supports the opening / closing valve so that the valve opens when a pressure difference between the vibration space and the space outside the vibration space becomes equal to or greater than a predetermined value.

[0023] According to this configuration, it is possible to prevent the pressure difference between the vibration space and the space outside the vibration space from becoming equal to or greater than a predetermined value.

[0024] (7) A vibration transmission device according to any of (1) to (6) above, comprising: an auxiliary cushion portion disposed at a position spaced apart from the vibrating body and at a position different from the cushion portion; an auxiliary cushion surface consisting of a part of the outer surface of the auxiliary cushion portion; an auxiliary partitioning member that partitions an auxiliary air chamber between the surface of the vibrating body opposite to the cushion portion; and an auxiliary covering portion that covers at least a part of the outer surface of the auxiliary cushion portion excluding the auxiliary cushion surface and has lower breathability than the auxiliary cushion portion, wherein the auxiliary covering portion partitions an auxiliary vibration space between the vibrating body and the auxiliary partitioning member, which includes the auxiliary air chamber and the inner space of the auxiliary cushion portion and transmits vibrations to the auxiliary covering portion via the internal air.

[0025] With this configuration, a common vibrating element can be used to uniformly vibrate a wide area of ​​both the covering portion that covers the cushion portion and the auxiliary covering portion that covers the auxiliary cushion portion.

[0026] (8) In the vibration transmission device described in (7) above, the auxiliary cushion portion may have a surface on the opposite side of the cushion portion from the opposing cushion surface and parallel surfaces arranged to be aligned along a continuous plane or curved surface.

[0027] This configuration allows for the application of vibration to the user over a wider area of ​​a continuous surface while keeping the number of vibrating elements and exciters to a minimum.

[0028] (9) In the vibration transmission device described in (7) or (8) above, the areas of the covering portion and the auxiliary covering portion may be different from each other.

[0029] This configuration allows the amplitude of the covering portion and the amplitude of the auxiliary covering portion to be different. Therefore, while using a common vibrator and exciter, vibrations of different magnitudes can be simultaneously applied to the user.

[0030] The embodiments described below are all specific examples of this disclosure. The numerical values, shapes, and components shown in the following embodiments are examples only and are not intended to limit this disclosure. Furthermore, among the components in the following embodiments, those not described in the independent claim representing the highest-level concept will be described as optional components. In addition, the contents of each embodiment can be combined.

[0031] (First Embodiment) Figure 1 is a schematic perspective view of a seat 100 to which the vibration transmission device 1 in the first embodiment of this disclosure is applied. The seat 100 has a seat cushion 101 that contacts and supports the user's buttocks, a seat back 102 that contacts and supports the user's back, and a headrest 103 that contacts and supports the user's head. The location in which the seat 100 is used is not particularly limited. For example, the seat 100 can be used in vehicles or other vehicles, or in buildings such as movie theaters. In this first embodiment, one vibration transmission device 1 is built into both the seat cushion 101 and the seat back 102. The vibration transmission devices 1 provided in the seat cushion 101 and the seat back 102 have the same structure.

[0032] Figure 2 is a schematic cross-sectional view showing the configuration of the vibration transmission device 1 according to the first embodiment. The vibration transmission device 1 includes a support part 10, an exciter 20, a vibrating body 30, a partition member 50, a cushion part 60, and a cover 70. Figure 3 is a schematic cross-sectional view taken along the line III-III in Figure 2.

[0033] The support section 10 supports the vibrating body 30 and the exciter 20, etc. The support section 10 has a plate-shaped bottom wall 11 to which the exciter 20 is fixed, and a peripheral wall 12 that protrudes from the outer peripheral edge of the bottom wall 11 to one side in the front-back direction of the bottom wall 11. The peripheral wall 12 is provided along the entire outer peripheral edge of the bottom wall 11. As shown in Figure 1, in this embodiment, the external shape of the vibration transmission device 1 is substantially rectangular, and the bottom wall 11 of the support section 10 is substantially rectangular in shape. The peripheral wall 12 is provided along the entire circumference of the substantially rectangular outer peripheral edge of the bottom wall 11. Multiple through holes 11A are formed in the bottom wall 11 of the support section 10, penetrating it in the front-back direction. The inner space and outer space of the support section 10 are in communication through these through holes 11A. The support section 10 is made of metal or resin, and each wall 11, 12 has virtually no breathability.

[0034] In the following, the front-to-back direction of the bottom wall 11 will be referred to as the front-to-back direction, the side on which the peripheral wall 12 protrudes from the bottom wall 11 will be referred to as the front side, and the opposite side as the rear side. Also, the left-to-right direction in Figure 2 will simply be referred to as the left-to-right direction. The front-to-back, left-to-right direction indications in the drawings refer to the directions defined in this way.

[0035] The vibrator 20 is an actuator that vibrates the vibrating body 30. The vibrator 20 includes an excitation section 22 and a vibrator body 24 that vibrates the excitation section 22 along a predetermined direction. The vibrating body 30 is connected to the excitation section 22 and vibrates integrally with the excitation section 22. In this first embodiment, the excitation section 22 protrudes outward from the vibrator body 24, and the vibrating body 30 is connected to a plate-shaped connecting plate 22A provided at its tip. The excitation frequency of the vibrator 20, that is, the frequencies of the excitation section 22 and the vibrating body 30, is not particularly limited and may or may not include frequencies in the audible range. If the excitation frequency includes frequencies in the audible range, the vibrator 20 also functions as a speaker.

[0036] The vibrator 20 is fixed to the bottom wall 11 in a position where the vibration section 22 protrudes forward from the vibrator body 24, and the vibration section 22 and the vibrating body 30 vibrate along the front-rear direction. The vibrating body 30 is connected to the front end of the vibration section 22. In this first embodiment, as shown in Figure 3, the vibrator body 24 and the vibration section 22 are substantially cylindrical, and the connecting plate 22A is substantially disc-shaped. The vibrator 20 is also positioned approximately in the center of the bottom wall 11.

[0037] The vibrator 20 operates by receiving power. The excitation unit 22 and the vibrating body 30 vibrate at a frequency corresponding to the electrical signal applied to the vibrator 20. The specific type of vibrator 20 is not particularly limited. For example, the vibrator 20 may consist of an electromagnetic actuator, a piezoelectric actuator, a magnetostrictive actuator, etc.

[0038] As described above, the vibrating body 30 is a component that is vibrated by the vibrator 20. In this first embodiment, the vibrating body 30 is composed of two components, a vibrating plate 32 and a sealing portion 34. The vibrating plate 32 corresponds to the "vibrating body body" in this disclosure.

[0039] The diaphragm 32 is plate-shaped. The diaphragm 32 is fixed to the front surface of the connecting plate 22A of the excitation unit 22 in a position approximately perpendicular to the front-rear direction. The front end position of the peripheral wall 12 of the support unit 10 is in front of the vibrating body 30, and the vibrating body 30 is surrounded by the peripheral wall 12. The size and position of the diaphragm 32 are set so that a gap is defined between the diaphragm 32 and the peripheral wall 12 around the entire circumference of the peripheral wall 12. In this embodiment, the diaphragm 32 is approximately rectangular in shape, slightly smaller than the bottom wall 11, and an approximately rectangular gap is defined between the diaphragm 32 and the peripheral wall 12 of the support unit 10.

[0040] The sealing portion 34 is a member that seals the gap between the diaphragm 32 and the peripheral wall 12. The sealing portion 34 is fixed to the outer edge of the diaphragm 32 and the peripheral wall 12, and extends across both the outer edge of the diaphragm 32 and the peripheral wall 12. The sealing portion 34 extends around the entire circumference of the outer edge of the diaphragm 32 and the peripheral wall 12, covering the entire gap between the diaphragm 32 and the support portion 10, and sealing the entire gap.

[0041] The air permeability of the diaphragm 32 and the sealing portion 34 is almost the same, and both have low air permeability. On the other hand, the sealing portion 34 has higher flexibility than the diaphragm 32. In this first embodiment, the sealing portion 34 is made of a substantially rectangular membrane member that is thinner than the diaphragm 32. The material of the sealing portion 34 may be the same as that of the diaphragm 32, or it may be different.

[0042] The partition member 50 is a member for holding the cushion portion 60. The partition member 50 has higher rigidity than the cushion portion 60. For example, the partition member 50 is made of metal.

[0043] The partition member 50 is fixed to the support portion 10. In this first embodiment, the partition member 50 has a substantially rectangular shape that substantially coincides with the support portion 10 when viewed from the front. The partition member 50 is fixed to the peripheral wall 12 of the support portion 10 such that its periphery abuts against the front end surface 12B of the peripheral wall 12 along the entire circumference of the peripheral wall 12. As described above, the peripheral wall 12 of the support portion 10 extends to a position in front of the vibrating body 30, and the partition member 50 is positioned at a distance forward from the vibrating body 30.

[0044] The partition member 50 has a highly breathable structure. For example, as shown in Figure 4, the partition member 50 is made of a wire mesh with a large opening area, and air can pass through both sides of the partition member 50 with virtually no obstruction.

[0045] The cushion portion 60 is made of an elastic material and is a component that receives the user's load while undergoing elastic deformation. In other words, the vibration transmission device 1 is positioned so that the load of the user sitting on the seat 100 is applied to the cushion portion 60.

[0046] Specifically, the vibration transmission device 1 provided in the seat cushion 101 is built into the seat cushion 101 in such a configuration that the cushion portion 60 and the support portion 10 are arranged in that order from the seat surface 101A side, in a direction perpendicular to the upper surface of the seat cushion 101, i.e., the seat surface 101A. Similarly, the vibration transmission device 1 provided in the seat back 102 is built into the seat back 102 in such a configuration that the cushion portion 60 and the support portion 10 are arranged in that order from the back surface 102A side, in a direction perpendicular to the backrest surface 102A, which is the surface of the seat back 102 that comes into contact with the user's back.

[0047] The cushion section 60 has relatively high breathability, although lower than that of the partition member 50, allowing air to pass through it. The cushion section 60 has at least higher breathability than the support section 10, the vibrating body 30, and the cover 70. The breathability of the cushion section 60 is not particularly limited, but for example, it is 400 cm² as measured by the Fragile type test specified in JIS L 4500. 3 / (cm 2 Set to (sec) or longer.

[0048] In this first embodiment, the cushion portion 60 is made of a three-dimensional mesh fiber structure and is formed of fibers that are intertwined in a three-dimensional manner. For example, the cushion portion 60 is made up of multiple long fibers, and these multiple fibers are formed to intertwine while forming loops at multiple locations. Spaces are partitioned between the fibers, and air passes through the cushion portion 60 through these spaces. The material of the cushion portion 60 is not particularly limited. For example, the cushion portion 60 is made of a polyester-based or polyethylene-based thermoplastic elastic resin.

[0049] The cushion portion 60 is positioned in front of the partition member 50 and spaced forward from the vibrating body 30, and is supported by the partition member 50 at this position. The cushion portion 60 is also supported by the partition member 50 in such a way that it covers the entire opening on the front side of the support portion 10. That is, a portion 60Y of the rear side surface 60A of the cushion portion 60 faces the peripheral wall 12 of the support portion 10 over its entire circumference, and the portion 60X of the rear side surface 60A of the cushion portion 60 surrounded by the peripheral wall 12 covers the opening of the support portion 10. The portion 60X of the rear side surface 60A of the cushion portion 60 surrounded by the peripheral wall 12 is exposed to the rear in the region enclosed by the peripheral wall 12. This portion 60X of the rear side surface 60A of the cushion portion 60 that is surrounded by the peripheral wall 12 and exposed to the rear corresponds to the "facing cushion surface" in this disclosure. Hereafter, this portion 60X will be referred to as the facing cushion surface 60X.

[0050] In this first embodiment, the cushion portion 60 is substantially rectangular in shape, and when viewed from the front, it has a substantially rectangular shape that is almost identical to the partition member 50 and the support portion 10. The cushion portion 60 is supported by the partition member 50 in a position where its thickness direction and front-to-back direction coincide. The portion 60Y along the outer edge of the rear side surface 60A of the cushion portion 60 faces the peripheral wall 12 of the support portion 10, and the opposing cushion surface 60X, which is the portion enclosed by the peripheral wall 12, has a substantially rectangular shape when viewed from the front.

[0051] As the cushion portion 60 is arranged as described above, a substantially sealed air chamber R1 is partitioned between the cushion portion 60 and the vibrating body 30. Specifically, the air chamber R1 is partitioned by the opposing cushion surface 60X, the front surface 30A of the vibrating body 30, and the portion of the inner surface 12A of the peripheral wall 12 of the support portion 10 that is in front of the part to which the vibrating body 30 is fixed. The peripheral wall 12 of the support portion 10 that partitions the air chamber R1 between the opposing cushion surface 60X and the front surface 30A of the vibrating body 30 corresponds to the "partitioning member" in this disclosure.

[0052] The cover 70 is a component that covers the outer surface of the cushion portion 60, excluding the opposing cushion surface 60X.

[0053] In this first embodiment, the portion 60Y of the rear side surface 60A of the cushion portion 60, excluding the opposing cushion surface 60X, is opposed to and closed by the front end surface 12B of the peripheral wall 12. The cover 70 covers the portion of the outer surface of the cushion portion 60 that excludes the rear side surface 60A of the cushion portion 60. In other words, the cover 70 covers the entire front side surface 60B and the entire outer peripheral surface 60C of the cushion portion 60.

[0054] In this first embodiment, the cover 70 has a larger area than the front surface 60B and outer peripheral surface 60C of the cushion portion 60, and a portion of the cover 70 extends rearward from the outer peripheral surface 60C of the cushion portion 60. That is, the cover 70 is composed of a surface cover 71 that covers the outer surface of the cushion portion 60 and an extension portion 72 that extends rearward from the rear edge of the surface cover 71. The extension portion 72 of the cover 70 covers a portion of the outer surface of the peripheral wall 12 of the support portion 10. The cover 70 is fixed to the support portion 10 by fixing its extension portion 72 to the peripheral wall 12. For example, the extension portion 72 is fixed to the peripheral wall 12 by being bonded to it. The surface cover 71 corresponds to the "covering portion" of this disclosure.

[0055] In this first embodiment, the vibration transmission device 1 is built into the seat cushion 101 with its surface cover 71 in contact with and aligned with the seat surface 101A. The vibration transmission device 1 is also built into the seat back 102 with its surface cover 71 in contact with and aligned with the backrest surface 102A.

[0056] The cover 70 is made of a material with low breathability. Furthermore, the cover 70 is made of a flexible material. The material of the cover 70 is not particularly limited. For example, the cover 70 may be made of synthetic leather or artificial leather. Alternatively, the cover 70 may be formed to have a multilayer structure in which a non-breathable material such as rubber or vinyl is covered with a material that has a relatively good feel, such as cloth.

[0057] As the cover 70 covers the outer surface of the cushion portion 60 as described above, the vibration transmission device 1 has a vibration space R10 formed within it, which is a space partitioned by the cover 70, the vibrating body 30, and the peripheral wall 12 of the support portion 10, and is composed of an air chamber R1 and an inner space R2 of the cushion portion 60.

[0058] Here, the vibration space R10 is a generally sealed space. Specifically, the vibration space R10 is partitioned by a cover 70 with low permeability, a vibrating body 30, and the peripheral wall 12 of the support part 10, and there is almost no movement of air between the vibration space R10 and the outer space R0 through these partitions. On the other hand, in this first embodiment, an orifice 80, which is a small-diameter through-hole, is formed in the peripheral wall 12 of the support part 10, and the vibration space R10 and the outer space R0 are in communication through the orifice 80. In detail, the orifice 80 is formed in the portion of the peripheral wall 12 that partitions the vibration space R10 and the air chamber R1, and penetrates it in the left-right direction. However, the diameter of the orifice 80 is sufficiently small compared to the volume of the vibration space R10, and the orifice 80 has an elongated shape in the axial direction. Therefore, the velocity of air movement through the orifice 80 is low, and the vibration space R10 is generally sealed. As a result, as will be described later, vibrations from the vibrating body 30 are transmitted to the surface cover 71 via the air inside the vibration space R10. In this first embodiment, the orifice 80 is provided in the portion of the peripheral wall 12 that is covered by the extension portion 72 of the cover 70, and a through hole is formed in the portion of the extension portion 72 that faces the orifice 80, penetrating both sides.

[0059] (Operation of the vibration transmission device according to the first embodiment) In the vibration transmission device 1 configured as described above, when the exciter 20 is activated, the vibrating body 30 vibrates in the front-rear direction. In front of the vibrating body 30, a substantially sealed vibration space R10 is partitioned. As a result, when the vibrating body 30 vibrates in the front-rear direction, a generally uniform pressure fluctuation occurs within the vibration space R10 according to Pascal's principle. Therefore, according to the vibration transmission device 1 of the above embodiment, the surface cover 71 partitioning the vibration space R10 can be vibrated substantially uniformly.

[0060] In detail, when the vibrating body 30 is displaced forward, the pressure in the air chamber R1 formed on the front side surface 30A of the vibrating body 30 increases. The air chamber R1 is filled with air, and the pressure of the air in the air chamber R1 increases. The cushion portion 60 is breathable, and an air passage is formed inside it that leads from the air chamber R1 to the surface cover 71. As a result, the pressure increase in the air chamber R1 is transmitted to the surface cover 71 through the passage. That is, the air in the cushion portion 60 is pressurized, and the pressure on the surface cover 71 increases. Here, as described above, since the air chamber R1 is filled with air, the pressure in the air chamber R1 increases uniformly according to Pascal's principle, as shown by arrow Y1 in Figure 5. As a result, the pressure of the air in the cushion portion 60 that receives this pressure increase also increases almost uniformly, and the pressure on the surface cover 71 increases almost evenly. The same is true when the vibrating body 30 is displaced backward; the pressure of the air in the air chamber R1 and the cushion portion 60, i.e., the air in the vibration space R10, decreases almost uniformly, and the pressure on the surface cover 71 decreases roughly evenly. Therefore, in the vibration transmission device 1 according to the above embodiment, when the exciter 20 is in operation, the pressure applied to the surface cover 71 fluctuates almost uniformly, and the surface cover 71 vibrates almost uniformly.

[0061] Thus, according to the vibration transmission device 1 of the first embodiment, vibrations applied to a part of the vibrating body 30 can be transmitted evenly to the entire surface cover 71 without uniformly vibrating the entire vibrating body 30, that is, without directly vibrating each part of the vibrating body 30 across its entire surface using an exciter having an area equivalent to that of the vibrating body 30. In other words, according to the vibration transmission device 1 of the first embodiment, uniform vibration of the surface cover 71 can be achieved even with a relatively small exciter 20. Furthermore, by providing an elastically deformable cushion part 60, uniform vibration of the surface cover 71 can be achieved while providing good support for the user's body. Therefore, according to the seat 100 of the embodiment to which this vibration transmission device 1 is applied, vibrations can be transmitted evenly over a wide area of ​​the user's buttocks and back while providing good seating comfort, thereby giving the user a high sense of being enveloped and present.

[0062] In particular, in the vibration transmission device 1 according to the first embodiment, the vibrating body 30 is composed of a diaphragm 32 and a seal portion 34 having high flexibility. Therefore, as shown by the dashed and solid lines in Figure 5, when the vibrating body 30 is vibrating, the deflection of the seal portion 34 maintains the sealed state of the gap between the diaphragm 32 and the peripheral wall 12, while making the displacement of the diaphragm 32 more uniform. Consequently, the pressure fluctuations in the air chamber R1 can be made more reliably uniform, and the surface cover 71 can be vibrated more reliably and uniformly.

[0063] Furthermore, in the vibration transmission device 1 according to the first embodiment, the cushion portion 60 is supported by a partition member 50 that has higher breathability. Therefore, the cushion portion 60 and, consequently, the user's body applying load to it can be stably supported without hindering the transmission of air-mediated pressure from the air chamber R1 to the inner space R2 of the cushion portion 60.

[0064] Furthermore, in the vibration transmission device 1 according to the first embodiment, an orifice 80 is formed in the peripheral wall 12, connecting the vibration space R10 with the outer space R0. This prevents the pressure inside the vibration space R10 from becoming excessive. Specifically, when a load is applied to the surface cover 71 from the outside and the cushion portion 60 is compressed and deformed, the volume of the vibration space R10 decreases and its pressure increases. Consequently, when the pressure inside the vibration space R10 becomes higher than the pressure in the outer space R0, the air inside the vibration space R10 leaks to the outside through the orifice 80, and the pressure inside the vibration space R10 decreases. Therefore, it is prevented that the pressure inside the vibration space R10 becomes excessive when an external load is applied. When the load is removed and the cushion portion 60 elastically returns to its original state, air is introduced into the vibration space R10 from the outside through the orifice 80. Furthermore, in the vibration transmission device 1 according to the first embodiment, since a through hole 11A is formed in the bottom wall 11, the pressure behind the vibrating body 30 is maintained to be approximately equal to the external pressure of the vibration transmission device 1, i.e., atmospheric pressure.

[0065] Here, if the pressure in the vibration space R10 becomes excessive, the amount of retraction of the vibrating body 30 and the excitation unit 22 will reach its maximum, causing the exciter 20 to bottom out, which may reduce the responsiveness of the excitation unit 22. Therefore, according to the vibration transmission device 1 of the first embodiment, by preventing the pressure in the vibration space R10 from becoming excessive, the excitation unit 20 can bottom out and the responsiveness of the excitation unit 22 can be improved.

[0066] Furthermore, the orifice 80 is a small-diameter hole, and the airflow rate through it to the outside is kept low. Therefore, the amount of air entering and leaving the vibration space R10 through the orifice 80 during vibration of the vibrating body 30 can be kept to a minimum, and the vibration space R10 can be maintained in a generally sealed state. In other words, the diameter of the orifice 80 is set to a size that prevents air from entering or leaving the vibration space R10 through the orifice 80 during vibration of the vibrating body 30.

[0067] (Second Embodiment) Next, the vibration transmission device 201 in the second embodiment of this disclosure will be described with reference to Figure 6. Figure 6 is a schematic cross-sectional view of the vibration transmission device 201, corresponding to Figure 2. In the drawings and the following description of the second embodiment, elements having the same structure as in the first embodiment will be given the same reference numerals as in the first embodiment. Detailed descriptions of elements having the same structure will be omitted.

[0068] Similar to the first embodiment, the vibration transmission device 201 according to the second embodiment includes a vibrating body 230, an exciter 220, a support portion 210 having a bottom wall 211 and a peripheral wall 212, a cushion portion 60, a cover 70, and a partition member 50. Also, similar to the first embodiment, in the vibration transmission device 201 according to the second embodiment, an air chamber R1 is partitioned between the vibrating body 230 and the cushion portion 60, and a vibration space R10 consisting of the air chamber R1 and the inner space R2 of the cushion portion 60 is partitioned by the vibrating body 230, the peripheral wall 212 of the support portion 210, and the surface cover 71. As a result, in the second embodiment as well, when the vibrating body 230 vibrates, the surface cover 71 can be vibrated substantially uniformly.

[0069] On the other hand, the detailed structure of the vibrating body 230 of the vibration transmission device 201 according to the second embodiment differs from that of the vibrating body 30 in the first embodiment. In the second embodiment, the seal portion 234 of the vibrating body 230 is formed to be connected to the diaphragm 232, while having higher flexibility than the diaphragm 232. Specifically, the seal portion 234 has a curved plate-like shape, and this shape enhances the flexibility of the seal portion 234. Also, in the second embodiment, the excitation portion 222 and the vibrating body 230 are integrally formed. Furthermore, in the second embodiment, the orifice 280 is formed on the peripheral wall of the support portion 10 so as to connect the vibration space R10 and the auxiliary air chamber R3, which will be described later. The seal portion 234 may be formed integrally with the diaphragm 232, or it may be formed separately from the diaphragm 232 and connected to the diaphragm 232. Also, the material of the seal portion 234 may be the same as that of the diaphragm 232, or it may be different.

[0070] Furthermore, the vibration transmission device 201 according to the second embodiment has a pair of left and right auxiliary cushion sections 260, 260 in addition to the cushion section 60. The two auxiliary cushion sections 260, 260 are arranged on both the left and right sides of the cushion section 60, spaced apart from the vibrating body 230. The two auxiliary cushion sections 260, 260 are arranged so that their front surfaces and the front surface of the cushion section 60 are aligned left and right and substantially flush. That is, the two auxiliary cushion sections 260, 260 each have a front surface 60B of the cushion section 60 that is opposite to the opposing cushion surface 60X of the cushion section 60, and front surfaces 260B, 260B arranged to be aligned along a continuous plane. The two auxiliary cushion sections 260, 260 are elastically deformable and breathable, similar to the cushion section 60. The two auxiliary cushion sections 260, 260 are made of the same material as the cushion section 60 and have substantially the same breathability. In this second embodiment, each auxiliary cushion portion 260 is substantially rectangular in shape. Furthermore, in this second embodiment, the structure of the two auxiliary cushion portions 260, 260 and their support structure are symmetrical. The respective front surfaces 260B, 260B of the aforementioned auxiliary cushion portions 260, 260 correspond to the "parallel surfaces" of this disclosure.

[0071] Each auxiliary cushion portion 260 is supported by a support portion 210. Specifically, the bottom wall 211 of the support portion 210 extends outward to the left and right beyond the peripheral wall 212. Auxiliary peripheral walls 214 extend forward from the left and right outer edges of the peripheral wall 212. The right auxiliary cushion portion 260 is positioned between the right peripheral wall 212 and the right auxiliary peripheral wall 214. The left auxiliary cushion portion 260 is positioned between the left peripheral wall 212 and the left auxiliary peripheral wall 214. Each auxiliary cushion portion 260 is supported by the support portion 210 in close contact with the peripheral wall 212, the auxiliary peripheral wall 214, and the bottom wall 211.

[0072] In the second embodiment, a communication hole 212A is formed in the peripheral wall 212, penetrating it from left to right. Specifically, the communication hole 212A is formed in the portion of the peripheral wall 212 that constitutes the right side wall and the portion that constitutes the left side wall, respectively. These communication holes 212A, 212A are formed in positions that communicate with the space behind the vibrating body 30. As a result, a portion of the left and right inner surfaces of each auxiliary cushion portion 260 is exposed to the left and right inward through the communication hole 212A. The portion 260X of the left and right inner surfaces of each auxiliary cushion portion 260 that is exposed to the left and right inward through the communication hole 212A corresponds to the "auxiliary cushion surface" in this disclosure. Hereinafter, this portion will be referred to as the auxiliary cushion surface 260X.

[0073] In the second embodiment, the vibration transmission device 201 has an auxiliary cover 270 that covers the outer surface of each auxiliary cushion portion 260. The auxiliary cover 270 is configured to have lower breathability and flexibility than the auxiliary cushion portion 260. In this second embodiment, the auxiliary cover 270 is made of the same material as the cover 70. The portions of the outer surface of the auxiliary cushion portion 260 along the peripheral wall 212, auxiliary peripheral wall 214, and bottom wall 211 are covered by these, and the auxiliary cover 270 covers the other portions of the auxiliary cushion portion 260.

[0074] Each auxiliary cover 270 is fixed to the peripheral wall 212 and the auxiliary peripheral wall 214. Each auxiliary cover 270 consists of an auxiliary surface cover 271 that forms the portion along the peripheral wall 212 and the auxiliary peripheral wall 214, and the other portion. The auxiliary surface cover 271 covers the area of ​​the outer surface of the auxiliary cushion portion 260, excluding the auxiliary cushion surface 260X, the portion along the peripheral walls 212 and 214, and the portion along the bottom wall 211. This auxiliary surface cover 271 constitutes the "auxiliary covering portion" of this disclosure. In this second embodiment, the sum of the areas of the two auxiliary surface covers 271 is set to be smaller than the area of ​​the surface cover 71.

[0075] In accordance with the above configuration, in the second embodiment, an auxiliary air chamber R3 is partitioned behind the vibrating body 230 by the rear side surface 230B of the vibrating body 30, the peripheral wall 212, the bottom wall 211, and the left and right auxiliary cushion surfaces 260X, 260X. Furthermore, an auxiliary vibration space R210, which is composed of the auxiliary air chamber R3 and the inner space R4 of each auxiliary cushion portion 260, is partitioned by the rear side surface 230B of the vibrating body 230, the support portion 210, and each auxiliary surface cover 271. Here, in the second embodiment, unlike the first embodiment, no through hole is formed in the bottom wall 211. As a result, the auxiliary vibration space R210 is a substantially sealed space. The peripheral wall 212 and the bottom wall 211 that partition the auxiliary air chamber R3 between the rear side surface 230B of the vibrating body 30 and the left and right auxiliary cushion surfaces 260X, 260X correspond to the "auxiliary partitioning member" in this disclosure.

[0076] (Effects of the second embodiment, etc.) As described above, in the vibration transmission device 201 according to the second embodiment, similar to the first embodiment, the surface cover 71 can be vibrated substantially uniformly when the vibrating body 230 is vibrated. Moreover, in the second embodiment, an auxiliary air chamber R3 is partitioned between the rear side surface 230B of the vibrating body 230 and the auxiliary cushion portion 260, and communicates with the inner space R4 of the auxiliary cushion portion 260. Furthermore, the inner space R4 of the auxiliary cushion portion 260 and the auxiliary air chamber R3 constitute a substantially sealed auxiliary vibration space R210. Therefore, according to the vibration transmission device 201 according to the second embodiment, when the vibrating body 230 is vibrated, the pressure fluctuation in the auxiliary vibration space R210 can be made substantially uniform, and each auxiliary surface cover 271 partitioning the auxiliary vibration space R210 can be vibrated substantially uniformly. In other words, according to the vibration transmission device 201 of the second embodiment, a common vibrator 220 can simultaneously vibrate the surface cover 71 and the auxiliary surface cover 271, which are provided at different positions, and can also vibrate each of the surface covers 71, 271, and 271 equally.

[0077] Furthermore, in the vibration transmission device 201 according to the second embodiment, the front surface 260B of each auxiliary cushion portion 260 and the front surface 60B of the cushion portion 60 are arranged so as to be flush with each other from left to right, that is, they are arranged along a continuous plane. Therefore, the surface covers 71 and 271 along the plane formed by these front surfaces 60B and 260B can be vibrated by a common vibrator 220. In other words, according to the vibration transmission device 201 according to the second embodiment, the common vibrator 220 can apply vibration to the user over a wider area of ​​a continuous plane.

[0078] Furthermore, in the second embodiment, the total area of ​​the auxiliary surface cover 271 and the area of ​​the surface cover 71 are set to be different sizes. Therefore, the amplitudes of the auxiliary surface cover 271 and the surface cover 71 can be made to be different from each other. Thus, while using a common vibrator 220, it is possible to impart vibrations that the user will perceive as different. Specifically, the product of the total area of ​​the two auxiliary surface covers 271 and the amount of deformation thereof is roughly proportional to the volume change of the auxiliary vibration space R210. The product of the area of ​​the surface cover 71 and the amount of deformation thereof is roughly proportional to the volume change of the vibration space R10. The vibration space R10 and the auxiliary vibration space R210 are separated by the vibrating body 30, and the volumes of these vibration spaces R10 and R210 change at the same frequency and the same amplitude. Therefore, because the total area of ​​the auxiliary surface cover 271 and the area of ​​the surface cover 71 are different, the amount of deformation of the auxiliary surface cover 271 and the amount of deformation of the surface cover 71 change at the same frequency but at different amplitudes. Specifically, in the second embodiment described above, the total area of ​​the auxiliary surface cover 271 is smaller than the area of ​​the surface cover 71. Therefore, the amplitude of the auxiliary surface cover 271 is larger than the amplitude of the surface cover 71.

[0079] Furthermore, in the second embodiment, the orifice 80 connects the vibration space R10 and the auxiliary vibration space R210. Therefore, it is possible to prevent the pressure difference between the vibration space R10 and the auxiliary vibration space R210 from becoming excessively large.

[0080] (Other variations) In the second embodiment described above, the case in which the auxiliary cushion portion 260 is in close contact with and supported by the bottom wall 211 of the support portion 210 was explained. Alternatively, as shown in Figure 7, the auxiliary cushion portion 260 may be supported by an auxiliary partition member 250, which has higher breathability than the auxiliary cushion portion 260, at a position spaced apart from the bottom wall 211, similar to the cushion portion 60. In this case, the space behind the auxiliary cushion portion 260 constitutes part of the auxiliary air chamber R3.

[0081] Furthermore, the shapes of the cushion portion 60 and the auxiliary cushion portion 260 are not limited to a roughly rectangular parallelepiped shape. For example, as shown in Figure 7, the shapes of the cushion portion 60 and the auxiliary cushion portion 260 may be set so that each front surface exhibits an arc shape in cross-sectional view, and these front surfaces are aligned along a continuous curved surface. That is, the auxiliary cushion portion 260 may be configured to have a front surface that is arranged to be aligned along a curved surface continuous with the front surface of the cushion portion 60. With this configuration, when the vibration transmission device 1 is applied to the seat cushion 101 or seat back 102, the cushion portions 60 and 260 can be made to conform to the user's buttocks or back M, thereby improving seating comfort.

[0082] In the first and second embodiments described above, the case in which the vibration space R10 and the outer space R0 are connected via an orifice 80 was explained, but the orifice 80 may be omitted. Alternatively, a pressure regulating device 380 as shown in Figure 8 may be provided instead of the orifice 80.

[0083] Specifically, Figure 8 shows a vibration transmission device 301 in which a pressure regulating device 380 is provided in place of the orifice 80. The configuration of the vibration transmission device 301 shown in Figure 8, other than the pressure regulating device 380, is the same as that of the first embodiment. Note that Figure 8 is a diagram corresponding to Figure 2 and is an enlarged view of a part of the schematic cross-sectional view of the vibration transmission device 301.

[0084] The pressure regulating device 380 includes two communication passages 381A and 382A formed in the peripheral wall 12 that connect the vibration space R10 with the outer space R0. The pressure regulating device 380 includes on-off valves 381B and 382B that open and close each communication passage 381A and 382A, respectively. The pressure regulating device 380 includes biasing means 381C and 382C that bias and support each on-off valve 381B and 382B, respectively. One on-off valve 381B and biasing means 381C are arranged to open against the biasing means 381C when the pressure in the outer space R0 becomes higher than a predetermined value relative to the pressure in the vibration space R10. The other on-off valve 382B and biasing means 382C are arranged such that when the pressure in the vibration space R10 becomes higher than a predetermined value relative to the pressure in the outer space R0, the on-off valve 382B opens against the biasing means 382C. In the pressure adjustment device 380 configured in this way, when the differential pressure between the vibration space R10 and the outer space R0 exceeds a predetermined value, one of the two on-off valves 381B and 382B opens, and air flows from one of the two spaces R10 and R0 to the other. Therefore, it is possible to prevent the differential pressure from exceeding a predetermined value, and consequently, to prevent the vibration space R10 from becoming excessively high or excessively low, causing the vibrator to bottom out. The biasing means 381C and 382C each correspond to the "on-off valve support portion" of this disclosure.

[0085] Alternatively, instead of or instead of the orifice 80 or pressure regulating device 380, or in addition to them, a constant voltage may be continuously applied to the vibrator to prevent the vibrator from bottoming out, thereby reducing the displacement of the vibrating body 30 to less than its maximum value.

[0086] In the second embodiment described above, a case was described in which two auxiliary cushioning sections 260 are provided in one vibration transmission device 201. Alternatively, one auxiliary cushioning section 260, or three or more auxiliary cushioning sections 260, may be provided in one vibration transmission device 201.

[0087] The structure of the vibrating body 230 described in the second embodiment may be applied to the vibration transmission device 1 according to the first embodiment. Also, the pressure regulating device 380 shown in the example in Figure 8 may be applied to the vibration transmission device 201 according to the second embodiment.

[0088] In the second embodiment described above, the case was described in which the front surface of the cushion portion 60, where the surface cover 71 is provided, and the front surface of the auxiliary cushion portion 260, where the auxiliary surface cover 271 is provided, are flush with each other. Alternatively, the surface cover 71 of the cushion portion 60 and the auxiliary surface cover 271 of the auxiliary cushion portion 260 may be positioned offset from each other in a direction perpendicular to the covers 71 and 271. Furthermore, the orientations of these surface covers 71 and 271 may be different. That is, the surface covers 71 and 271 may be arranged such that perpendicular lines perpendicular to each other intersect. With such a configuration, the vibration transmission device can be applied to objects with relatively complex shapes, such as sofas with steps, and multiple parts of the object can be vibrated by a common vibrator 230.

[0089] Figures 6 and 7 show a case where the cushion section 60 and the auxiliary cushion section 260 are arranged in close proximity to each other on the left and right sides, but these cushion sections 60 and 260 may be spaced apart. That is, a gap may be partitioned between the cushion section 60 and the auxiliary cushion section 260, or other members may be placed there. For example, another cushioning material, similar to these, made of an elastic material that elastically deforms and receives the user's load, may be placed between the cushion section 60 and the auxiliary cushion section 260. With this configuration, of the areas that come into contact with the user, consisting of the cushion section 60, the auxiliary cushion section 260, and other cushioning materials, the areas corresponding to the other cushioning materials can be kept from vibrating, while the areas corresponding to the cushion section 60 and the auxiliary cushion section 260 can be vibrated. Therefore, the vibration range can be appropriately set according to the application of the object to which the vibration transmission device is applied, thereby increasing the design freedom of the object.

[0090] In each of the above embodiments, the specific shapes of the sealing portions 34 and 234 are not limited to those described above. That is, in the first embodiment, the sealing portion 34 may have a curved shape, and in the second embodiment, the sealing portion 234 may have a shape different from a curved shape. Furthermore, for example, the sealing portion 34 (234) and the diaphragm 32 (232) may be formed integrally, and the ends of the member including these may be made into a film with a thinner thickness than other parts to function as a highly flexible sealing portion.

[0091] In the embodiments described above, the case in which the vibration transmission device 1,201 is applied to a seat 100 was explained, but the application of the vibration transmission device 1,201 is not limited to the seat 100. For example, the vibration transmission device 1,201 may be applied to a bed or the like.

[0092] In each of the above embodiments, the partition member 50 can be omitted.

[0093] In each of the above embodiments, the cushion portion 60, 260 and the cover 70, 270 should be configured such that the cushion portion 60, 260 has higher breathability than the cover 70, 270, and their specific shape and material are not limited to those described above. [Industrial applicability]

[0094] This disclosure is useful in fields such as immersive video systems and sound systems. [Explanation of Symbols]

[0095] 1: Vibration transmission device 10: Support part 12: Peripheral wall (partition member) 20: Vibrator 30: Vibrating body 32: Diaphragm (vibrating body) 34: Seal part 50: Partition member 60: Cushion part 60X: Opposing cushion surface 70: Cover 71: Surface cover (coating part) 80: Orifice 100: Sheet 201: Vibration transmission device (second embodiment) 211: Bottom wall (auxiliary partition member) 212: Peripheral wall (auxiliary partition member) 260: Auxiliary cushion part 270: Auxiliary cover 272: Auxiliary surface cover (auxiliary covering part) 380: Pressure Regulator 381A, 382A: Communication path 381B, 382B: Shut-off valves 381C, 392C: Biasing means (support part for on / off valve) R1: Air chamber R3: Auxiliary air chamber R10: Vibration space R20: Auxiliary vibration space

Claims

1. A vibrating body and A vibrator that vibrates the aforementioned vibrating body, A cushion portion is positioned at a distance from the vibrating body and is elastically deformable, A partitioning member that divides an air chamber between the opposing cushion surface, which is the surface of the cushion portion facing the vibrating body, and the vibrating body, The cushion portion comprises a covering portion that covers at least a part of the outer surface of the cushion portion excluding the opposing cushion surface, and which has lower breathability than the cushion portion, The vibration transmission device is characterized in that the covering portion divides a vibration space between the vibrating body and the partitioning member, which includes the air chamber and the inner space of the cushion portion, and transmits vibrations to the covering portion via the internal air.

2. In the vibration transmission device according to claim 1, The partition member comprises a peripheral wall surrounding the vibrating body, The vibration transmission device is characterized in that the vibrating body comprises a vibrating body body connected to the vibrator, and a sealing portion which is more flexible than the vibrating body body and closes the gap between the vibrating body body and the peripheral wall.

3. In the vibration transmission device according to claim 1, A vibration transmission device characterized by further comprising a partition member provided along the opposing cushion surface and having higher breathability than the cushion portion.

4. In the vibration transmission device according to claim 1, A vibration transmission device further comprising a pressure adjustment device for adjusting the pressure in the vibration space.

5. In the vibration transmission device according to claim 4, The vibration transmission device is characterized in that the pressure regulating device is an orifice formed in the partition member that connects the vibration space with the space outside it.

6. In the vibration transmission device according to claim 4, The vibration transmission device is characterized by comprising: a communication passage connecting the vibration space and the space outside it; an on-off valve for opening and closing the communication passage; and an on-off valve support portion that supports the on-off valve so as to open when the pressure difference between the vibration space and the space outside it exceeds a predetermined value.

7. In the vibration transmission device according to claim 1, An auxiliary cushion portion is positioned at a location separated from the vibrating body and at a location different from the cushion portion, An auxiliary cushion surface, which is part of the outer surface of the auxiliary cushion portion, and an auxiliary partitioning member that partitions an auxiliary air chamber between the surface of the vibrating body opposite to the cushion portion, The auxiliary covering portion covers at least a portion of the outer surface of the auxiliary cushion portion excluding the auxiliary cushion surface, and has lower breathability than the auxiliary cushion portion. The vibration transmission device is characterized in that the auxiliary covering portion partitions an auxiliary vibration space between the vibrating body and the auxiliary partitioning member, which includes the auxiliary air chamber and the inner space of the auxiliary cushion portion, and transmits vibrations to the auxiliary covering portion via the internal air.

8. In the vibration transmission device according to claim 7, The vibration transmission device is characterized in that the auxiliary cushion portion comprises a surface on the opposite side of the cushion portion from the opposing cushion surface and parallel surfaces arranged to be aligned along a continuous plane or curved surface.

9. In the vibration transmission device according to claim 7, A vibration transmission device characterized in that the areas of the covering portion and the auxiliary covering portion are different from each other.

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