Vehicle seat

Abstract

To provide a vehicle seat that can efficiently propagate desired vibration to an upper body of an occupant seating on a seat cushion from a seat back.SOLUTION: In the vehicle seat, when a vibration unit in the seat back is operated while the upper body of the occupant seating on the seat cushion is supported by the seat back, the vibration generated by the vibration unit is directly propagated to whole of a pressure receiving member 30 to efficiently propagate the vibration to the upper body of the occupant from the pressure receiving member 30.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a vehicle seat for a vehicle, etc., that is equipped with at least a seat cushion and a seat back, and more particularly to a vehicle seat that is capable of transmitting vibrations to an occupant seated on the seat cushion. [Background technology]

[0002] As a vehicle seat having a seat cushion and a seat back, a vehicle seat having a vibrator built into the seat back that applies massage vibrations to an occupant seated on the seat cushion is generally known (see, for example, Patent Document 1).

[0003] Here, in the vehicle seat described in Patent Document 1, upper and lower reinforcing frames are hung on the left and right sides of a seat back frame that forms the skeleton of the seat back, and a frame body is attached to the upper and lower reinforcing frames using clips or the like, and a vibrator is held by the frame body via a spring member. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Utility Model Application Publication No. 61-196741 Summary of the Invention [Problem to be solved by the invention]

[0005] In the vehicle seat described in Patent Document 1, the occupant is supported by a frame body, and the vibrator (vibration unit) is held by the frame body via a spring member. As a result, there is a risk that the vibration of the vibrator will be absorbed by the spring member before being transmitted to the frame body, which raises concerns that the effect of transmitting the vibration to the occupant will be low. Furthermore, the use of a dedicated spring member for mounting the vibrator to the frame increases the number of parts.

[0006] Furthermore, if the vibration unit interferes with surrounding components, abnormal noise may be generated or passengers may feel uncomfortable, so it is desirable to make the vibration unit less likely to interfere with surrounding components.

[0007] The present invention has been made in consideration of the above-mentioned technical background, and has an object to provide a vehicle seat that can efficiently transmit desired vibrations to an occupant seated on the seat cushion, in which the vibration unit is less likely to interfere with surrounding components, and in which the number of parts can be reduced. [Means for solving the problem]

[0008] The vehicle seat of the present invention, which solves the above-mentioned problems, is a vehicle seat having at least a seat cushion and a seat back, the vehicle seat having a frame that forms a skeleton, a pressure-receiving member that is arranged inside the frame and supports an occupant, a support wire that elastically supports the pressure-receiving member on the frame, and a covering member that covers the frame and the pressure-receiving member, the pressure-receiving member having a bulging bead, and a vibration unit is attached to the pressure-receiving member in a state overlapping the bead.

[0009] In the vehicle seat according to the present invention, a vibration unit is attached to a pressure-receiving member that is configured to receive a load from an occupant and to sink the occupant into the vehicle seat, and that is sufficiently subjected to pressure from the occupant. Therefore, when the vibration unit is activated while the occupant is seated on the seat cushion and supported by the pressure-receiving member, the vibration generated by the vibration unit is directly transmitted to the entire pressure-receiving member that receives the load from the occupant, and is efficiently transmitted from the pressure-receiving member to the occupant via the covering member. In addition, since no spring member is required to attach the vibration unit to the pressure-receiving member, the number of parts can be reduced. The covering member of the present invention includes a cushion pad, a skin provided on the outside of the cushion pad, a back cover that covers the back side of the seat, and the like.

[0010] In the above-described configuration, the bead may have a horizontal bead extending along the left-right direction and a vertical bead extending in a direction perpendicular to the left-right direction, and the vertical bead and the horizontal bead may be continuous.

[0011] In the above-mentioned configuration, the bead may bulge in a direction away from the occupant.

[0012] In the above-mentioned configuration, the vibration unit may have a motor and an eccentric weight, and a rotation shaft of the motor may be disposed along a longitudinal direction of the vertical bead.

[0013] In the above-mentioned configuration, the vibration unit may have a motor and an eccentric weight, and the rotation shaft of the motor may be disposed along the longitudinal direction of the horizontal bead.

[0014] In addition, in the above-mentioned configuration, the vehicle seat may be provided with a plurality of mounting members for attaching the vibration unit to the pressure-receiving member, and the plurality of mounting members may be arranged on one side and the other side of the bead. In addition, in the above-mentioned configuration, the frame may be a seat back frame, the vibration unit and the support wire may be arranged on the back side of the pressure-receiving member, the support wire may have a recess bent so as to be concave downward, and the vibration unit may be arranged above the recess. Effect of the Invention

[0015] In the present invention, when the vibration unit is activated while an occupant seated on the seat cushion is supported by the pressure-receiving member, the vibration generated by the vibration unit is directly transmitted to the entire pressure-receiving member, and is efficiently transmitted from the pressure-receiving member to the occupant via the covering member. Therefore, according to the present invention, the desired vibration generated by the vibration unit can be efficiently transmitted to the occupant seated on the seat cushion. Furthermore, since a spring member for attaching the vibration unit to the pressure-receiving member is not required, the number of parts can be reduced. [Brief description of the drawings]

[0016] [Figure 1] 1 is a perspective view of a vehicle seat showing one embodiment of a vehicle seat according to the present invention; [Diagram 2] 2 is a front perspective view of a seat cushion frame and a seat back frame incorporated in the vehicle seat shown in FIG. 1. [Diagram 3] FIG. 3 is a rear view of the seat back frame shown in FIG. 2. [Figure 4] 3 is a front perspective view of the pressure-receiving member shown in FIG. 2. [Diagram 5] 5 is a rear perspective view of the pressure-receiving member shown in FIG. 4. [Figure 6] 3 is an exploded perspective view of the pressure-receiving member and the second cover member shown in FIG. 2, as viewed from the front side. FIG. [Figure 7] FIG. 7 is an enlarged perspective view of the vibration unit shown in FIG. 6. [Figure 8] FIG. 11 is a partially enlarged perspective view showing a vibration unit and a first cover member that are attached vertically to the rear surface of a pressure-receiving member as viewed from the left side, as a modified example of a vehicle seat in one embodiment. [Figure 9] 9 is a partially enlarged perspective view showing the vibration unit and the first cover member shown in FIG. 8 as viewed from the right side. [Figure 10] FIG. 11 is a partially enlarged perspective view showing a vibration unit provided laterally on the back surface of a pressure-receiving member and a first cover member as viewed from the right side, as another modified example of a vehicle seat in one embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Hereinafter, an embodiment of a vehicle seat according to the present invention will be described with reference to the accompanying drawings. The vehicle seat according to the embodiment is configured as a vehicle seat S arranged in a driver's seat of an automobile, as shown in FIG. 1, for example. The vehicle seat S includes a seat cushion S1 in which a cushion pad made of a cushioning material such as urethane foam is covered with a skin such as synthetic leather or fabric, a seat back S2, and a headrest S3. The cushion pad, the skin, and the back cover of the skin that covers the back of the vehicle seat S are examples of covering members. In the following description, the front-rear and left-right directions are defined as directions seen from the perspective of an occupant seated on the seat cushion S1.

[0018] 2, the seat cushion S1 includes a seat cushion frame F1 that constitutes its framework, and the seat back S2 includes a seat back frame F2 that constitutes its framework. Although not shown, the head rest S3 also includes a head rest frame that constitutes its framework.

[0019] The seat cushion frame F1 is press-formed into a roughly U-shape with an open rear portion in a plan view, and has a plate-shaped front frame 11 at its front portion. The rear portions of cushion side frames 12, 12 extending rearward from the left and right portions of the front frame 11 are connected to the left and right via a rear connecting pipe 13. Four seat cushion springs 14 are tensioned and aligned to the left and right between the rear connecting pipe 13 and the front frame 11. The seat cushion frame F1 is provided on the floor of the driver's seat via slide rails SL so that its position can be freely adjusted in the front-rear direction.

[0020] On the other hand, the seatback frame F2 has an upper pipe frame 21 formed by bending a pipe material into an inverted U-shape with an open lower portion when viewed from the front, left and right back side frames 22, 22 which are connected by welding while embracing the left and right lower portions of the upper pipe frame 21, and a lower frame 23 which connects the lower ends of the back side frames 22, 22, which are framed by these components in a vertically long rectangle. The lower portion of the seatback frame F2 is rotatably connected to the rear ends of the left and right cushion side frames 12, 12 of the seat cushion frame F1 via a reclining unit RU, which allows the seatback frame F2 to tilt forward and backward.

[0021] A pair of left and right support brackets 24, 24 for mounting a pair of left and right headrest stays (reference numbers omitted) protruding from the bottom of the headrest S3 shown in Fig. 1 are fixed by welding to the upper horizontal portion of the upper pipe frame 21 of the seatback frame F2. In addition, a reinforcing member 25 is installed on the top of the pressure-receiving member 30 between the tops of the left and right vertical portions of the upper frame 21. This reinforcing member 25 is formed by bending a rod into a symmetrical shape that is approximately aligned with the plane of the seatback frame F2.

[0022] As shown in Fig. 2 and Fig. 3, a pressure receiving member 30 is disposed inside the frame-shaped seat back frame F2 to support the upper body of the occupant seated on the seat cushion S1 so as to be elastically movable backward. In order to elastically support the pressure receiving member 30 in the front-rear direction, an upper support wire 26 is stretched between the lower parts of the left and right vertical parts of the upper frame 21, and a lower support wire 27 is stretched between the left and right back side frames 22, 22. The upper support wire 26 and the lower support wire 27 are linear members each formed by bending a wire such as a piano wire having spring elasticity into a symmetrical shape approximately along the plane of the seat back frame F2. Here, it is desirable to curve the upper support wire 26 or the lower support wire 27 away from the vibration unit 50, since this improves the workability of mounting the upper support wire 26, the lower support wire 27, or the vibration unit 50.

[0023] The upper support wire 26 is bent downward so that both left and right ends are aligned with the left and right vertical portions of the upper frame 21. The left and right ends of the upper support wire 26 are connected and supported by the left and right vertical portions of the upper frame 21 while being embraced by support tongues 28, 28 which are welded and fixed to the left and right vertical portions of the upper frame 21, respectively. The upper support wire 26 is bent in a mountain shape in the vertical direction so that the middle portion supporting the pressure-receiving member 30 is positioned lower than both ends connected and supported by the left and right support tongues 28, 28, and the central support portion 26B of the middle portion is positioned higher than the support portions 26A, 26A on both sides.

[0024] Both left and right end portions of the lower support wire 27 are connected to toggle support mechanisms (only the right one is shown in FIG. 2) 40 that are installed on the inner surfaces of the left and right back side frames 22, 22, respectively. This lower support wire 27 is bent in a mountain shape in the vertical direction so that the middle portion that supports the pressure-receiving member 30 is positioned lower than both end portions connected to the toggle support mechanism 40, and in the middle portion, the central support portion 27B is positioned lower than the support portions 27A, 27A on both sides.

[0025] The toggle support mechanism 40 is provided with a swing link member that can swing backward over a neutral point (a point at which the mechanism cannot decide which direction to move) while resisting the tension of a tension coil spring, and both left and right ends of the lower support wire 27 are connected to this swing link member. Here, the tension of the tension coil spring of the toggle support mechanism 40 is set to an appropriate tension that allows the swing link member to swing backward over the neutral point when a rearward moving load of a predetermined value or more acts on both ends of the lower support wire 27.

[0026] Here, the pressure receiving member 30 is a resin plate member for supporting the upper body of an occupant seated on the seat cushion S1 so as to be elastically movable backward, and is molded, for example, into a shape as shown in Fig. 4 and Fig. 5, that is, into a substantially pentagonal shape with its apex pointing downward. On the rear surface (back surface) of this pressure receiving member 30, hook-shaped holding portions 30A, 30A that engage from above with the left and right support portions 26A, 26A of the upper support wire 26 shown in Fig. 3, and a hook-shaped holding portion 30B that engages from below with the central support portion 26B of the upper support wire 26 are integrally molded. Similarly, on the rear surface (back surface) of the pressure receiving member 30, hook-shaped holding portions 30C, 30C that engage from above with the left and right support portions 27A, 27A of the lower support wire 27 shown in Fig. 3, and a hook-shaped holding portion 30D that engages from below with the central support portion 27B of the lower support wire 27 are integrally molded.

[0027] Here, as shown in Fig. 6 and Fig. 7, the pressure receiving member 30 is integrally formed with an accommodating recess 30E for accommodating the vibration unit 50. This accommodating recess 30E opens on the front surface (front face) of the pressure receiving member 30 and bulges out on the rear surface (back face), and its shape in front view is a horizontally long rectangle. Nuts N are embedded by insert molding at the four corners of the rectangular opening of the accommodating recess 30E of the pressure receiving member 30 as mounting members for mounting a mounting bracket 54 described later. The bottom of this accommodating recess 30E functions as a first cover member (interference suppression member) and suppresses interference between the vibration unit 50 and the cushion pad covering the rear side of the seatback frame F2.

[0028] The vibration unit 50 is composed of a drive motor (actuator) 51, a vibration weight 53 attached to a rotating shaft 52 of the drive motor 51, and a mounting bracket 54 attached to the drive motor 51. The vibration weight 53 is a block shape of a fan shape when viewed from the front, formed by stacking a plurality of fan-shaped plates, and the rotating shaft 52 is attached to a position eccentric to the center of gravity of the vibration weight 53, so that a vibration of a predetermined frequency is generated with the rotation of the rotating shaft 52. The vibration generated by the vibration unit 50 can be set to an appropriate frequency that provides a massage effect or an awakening effect to an occupant seated on the seat cushion S1 by changing the number of revolutions of the drive motor 51. A controller that controls the operation of the vibration unit 50 can be installed, for example, in the driver's seat in front of the vehicle seat S.

[0029] The mounting bracket 54 has bolt insertion holes 54A that match at least three nuts N of the four nuts N of the pressure-receiving member 30 shown in FIG. 6. Here, in this embodiment, a cover plate 55 that is attached to the front surface (front face) of the pressure-receiving member 30 together with the mounting bracket 54 is provided as a second cover member (interference suppression member). This cover plate 55 is a rectangular plate member that is large enough to cover the accommodating recess 30E of the pressure-receiving member 30, and bolt insertion holes 55A that match the four nuts N are formed at each of its four corners. Such a cover plate 55 is attached to the front surface (front face) of the pressure-receiving member 30 by four bolts B that are screwed into the four nuts N of the pressure-receiving member 30 through the bolt insertion holes 55A and the bolt insertion holes 54A of the mounting bracket 54, and covers the accommodating recess 30E. As a result, the vibration unit 50 is attached to the pressure-receiving member 30 without using a spring member. This makes it possible to reduce the number of parts.

[0030] Next, the operation and effect of the vehicle seat S configured as one embodiment of the vehicle seat according to the present invention will be described. In a vehicle in which the vehicle seat S shown in Fig. 1 is arranged in the driver's seat, during normal driving or when the pressure acting from the upper body of an occupant seated on the seat cushion S1 to the seat back S2 is within a predetermined range, the upper support wire 26 and the lower support wire 27 shown in Fig. 2 and Fig. 3 elastically deform rearward to an appropriate degree, so that the upper body of the occupant sinks appropriately into the seat back S2 and is maintained in a stable driving posture.

[0031] In this state where the upper body of the occupant seated on the seat cushion S1 of the vehicle seat S is appropriately sunk into the seat back S2, for example, by operating a controller (not shown) installed in the driver's seat in front of the vehicle seat S, the vibration unit 50 generates vibrations as the vibration weight 53 rotates together with the rotary shaft 52 of the drive motor 51. The vibration of the vibration unit 50 is then transmitted directly to the entire pressure-receiving member 30 without passing through a spring member, and is efficiently transmitted from the pressure-receiving member 30 to the upper body of the occupant and parts other than the upper body via the cushion pad.

[0032] That is, according to the vehicle seat S of one embodiment, the desired vibration generated by the vibration unit 50 to give a massage effect, an awakening effect, or the like to the occupant seated on the seat cushion S1 can be efficiently transmitted from the seat back S2 to the upper body of the occupant. In this case, the vibration unit 50 is accommodated in the accommodation recess 30E that protrudes toward the rear (back) side of the pressure receiving member 30, and the vibration unit 50 is disposed behind the front surface, which is the pressure receiving surface of the pressure receiving member 30, so that the uncomfortable feeling of the vibration unit 50 coming into contact with the upper body of the occupant supported by the seat back S2 can be eliminated.

[0033] According to the vehicle seat S of one embodiment, the cover plate 55 is attached (fixed) to the periphery of the accommodation recess 30E of the pressure receiving member 30 together with the mounting bracket 54 of the vibration unit 50, so that the vibration unit 50 can be stably operated by suppressing interference between the vibration unit 50 and a cushion pad (not shown). And, since the cover plate 55 covers the accommodation recess 30E in which the vibration unit 50 is accommodated, it is possible to suppress the intrusion of dust into the accommodation recess 30E. Also, the bottom of the accommodation recess 30E functions as a first cover member (interference suppression member) and suppresses interference between the vibration unit 50 and the cushion pad covering the rear side of the seatback frame F2 and the vibration unit 50.

[0034] Furthermore, since the nut N, which is the mounting member for mounting the mounting bracket 54 of the vibration unit 50, is insert molded around the opening of the accommodating recess 30E of the pressure-receiving member 30, the mounting bracket 54 can be easily installed, and the rigidity of the pressure-receiving member 30 can be increased, allowing the vibration of the vibration unit 50 to be efficiently transmitted to the entire pressure-receiving member 30.

[0035] Furthermore, since the vibration unit 50 is positioned at a position where it does not overlap with the upper support wire 26 and the lower support wire 27, i.e., at a height position between the upper support wire 26 and the lower support wire 27, the upper support wire 26 and the lower support wire 27 do not get in the way when assembling the vibration unit 50, thereby improving the ease of assembling the vibration unit 50.

[0036] Furthermore, the upper support wire 26 and the lower support wire 27 are arranged to connect the left and right portions of the seatback frame F2, and the hook-shaped retaining portion 30B that engages with the central support portion 26B of the upper support wire 26 from below and the hook-shaped retaining portion 30D that engages with the central support portion 27B of the lower support wire 27 from below are arranged side by side above and below the vibration unit 50, so that the pressure-receiving member 30 holds the upper support wire 26 and the lower support wire 27 in the portion of the pressure-receiving member 30 where large vibrations are generated.Therefore, when the vibration unit 50 vibrates, the generation of abnormal noise due to interference between the pressure-receiving member 30 and the linear members, the upper support wire 26 and the lower support wire 27, can be suppressed.

[0037] The vehicle seat S has been described above as one embodiment of the vehicle seat according to the present invention, but the vehicle seat of the present invention is not limited to the vehicle seat S of one embodiment, and its structure can be modified as appropriate.

[0038] 8 to 10, the pressure-receiving member 30 may be formed with a plurality of vertical beads 30F and horizontal beads 30G that bulge out toward the rear surface (back surface). In this case, the presence of the plurality of vertical beads 30F and horizontal beads 30G increases the rigidity of the pressure-receiving member 30, so that the vibration generated by the vibration unit 50 can be transmitted to the entire pressure-receiving member 30.

[0039] 8 and 9, the vibration unit 50 can be installed on the rear (back) side of the pressure-receiving member 30 in a vertical orientation with the rotation axis facing up and down. In this case, in order to suppress interference between the vibration unit 50 and a cushion pad (not shown) and stably operate the vibration unit 50, it is preferable to provide a cover member (first cover member, interference suppression member) 56 having a motor cover part 56A that covers the drive motor 51 and a weight cover part 56B that protrudes outward from the motor cover part 56A and covers the rotation area of ​​the vibration weight 53. In this case, a configuration can be made in which the motor cover part 56A is bent from the weight cover part 56B to protrude outward in a stepped shape. This cover member 56 is attached to the pressure-receiving member 30 by fastening it together with a mounting bracket 57 of the vibration unit 50.

[0040] Furthermore, as shown in FIG. 10, the vibration unit 50 can be installed on the rear (back) side of the pressure receiving member 30 with the rotation axis facing left and right. In this case, in order to suppress interference between the vibration unit 50 and the cushion pad (not shown) and stably operate the vibration unit 50, it is preferable to provide a cover member (first cover member) 58 having a motor cover part 58A that covers the drive motor 51 and a weight cover part 58B that protrudes outward from the motor cover part 58A and covers the rotation area of ​​the vibration weight 53. This cover member 58 is attached to the pressure receiving member 30 by fastening together with a mounting bracket 59 of the vibration unit 50. Here, a part of the vibration unit 50 enters a recess formed between two lateral beads 30G arranged vertically, and the space within the recess can be effectively used to make the vehicle seat S compact.

[0041] As in these modified examples, by providing the cover members 56, 58 on the rear side of the vibration unit 50, interference between the vibration unit 50 and the rear cover (covering member) covering the rear side of the seatback frame F2 is suppressed. In addition, since the cover members 56, 58 are composed of the motor cover parts 56A, 58A and the weight cover parts 56B, 58B, it is possible to suppress interference with the rear cover even if the eccentric weight vibrates while realizing a compact size. In addition, if the weight cover parts 56B, 58B have a shape that protrudes from the motor cover 56A, 58A, it is possible to increase the rigidity of the cover members 56, 58.

[0042] In the above embodiment, both ends of the lower support wire 27 were supported by the toggle support mechanism 40, but only one end may be supported by the toggle support mechanism 40, or both ends may be supported by the left and right side frames without using the toggle support mechanism 40.

[0043] In the above embodiment, the vibration unit 50 is provided near the center in the vertical direction of the pressure receiving member 30, but it can also be provided below the center. When the pressure receiving member 30 is provided near the bottom of the seat back S2, the lower part of the occupant's upper body (around the waist) is usually in contact with the seat back S2, so that the vibration of the vibration unit 50 can be stably transmitted to the occupant.

[0044] The vehicle seat S in one embodiment is configured for a vehicle in which the driver's seat is located on the right side, but by reversing the left-right structure, it can be applied to a vehicle in which the driver's seat is located on the left side.

[0045] The vehicle seat S of the embodiment can also be configured as a bucket-type vehicle seat in which the seat cushion S1, the seat back S2, and the headrest S3 are integrally configured.

[0046] Furthermore, the vehicle seat of the present invention can also be configured as a seat for a ship or an aircraft. [Explanation of symbols]

[0047] F1 seat cushion frame 11 Front Frame 12 Cushion side frame 13 Rear connecting pipe F2 seat back frame 21 Upper frame 22 Backside Frame 23 Lower frame 24 Support bracket 25 Reinforcement members 26 Upper support wire 27 Lower support wire 28 Support tongue piece 30 Pressure-receiving member 30A Engagement hook part 30B Engagement hook part 30C Engagement hook part 30D Engagement hook part 30E Recessed part 40 Toggle support mechanism B Bolt N Nut RU Reclining unit S Vehicle seat S1 Seat Cushion S2 seat back S3 Headrest SL Slide Rail

Claims

1. A vehicle seat having at least a seat cushion and a seat back, The vehicle seat includes a frame constituting a skeleton, a vibration unit, and a pressure-receiving member for supporting an occupant, the pressure-receiving member has two open first through holes arranged at an interval in a predetermined direction, A vehicle seat, characterized in that the entirety of the vibration unit is located between the two first through holes in the predetermined direction.

2. A vehicle seat as described in Claim 1, characterized in that the pressure-receiving member has a second through hole that overlaps with the vibration unit when viewed from the fore-and-aft direction.

3. A vehicle seat as described in Claim 1, characterized in that the fastening point of the vibration unit to the pressure-receiving member is located between the two first through holes in the specified direction.

4. The pressure-receiving member has a bead, 4. The vehicle seat of claim 3, wherein the fastening points are located at the beads.

5. The bead has a portion extending in a direction perpendicular to the predetermined direction, The vehicle seat according to claim 4 , wherein the portion is arranged side by side with the vibration unit in the perpendicular direction.

6. Further comprising a mounting bracket for mounting the vibration unit to the pressure-receiving member, the pressure-receiving member has a third through hole aligned with the second through hole at a distance in a direction perpendicular to the predetermined direction, The mounting bracket is Located between two of the first through holes in the predetermined direction, The vehicle seat according to claim 2 , wherein the second through hole is located between the second through hole and the third through hole in the perpendicular direction.

7. Further comprising a support wire for supporting the pressure-receiving member, the pressure-receiving member has a holding portion that holds the supporting wire, The vehicle seat according to claim 2 , wherein the retaining portion is arranged side by side with the second through hole in a direction perpendicular to the predetermined direction.

8. The pressure-receiving member has a bead adjacent to the second through hole, 3. The vehicle seat according to claim 2, wherein the vibration unit is disposed so as to overlap with the bead when viewed from the predetermined direction.

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