Vehicle seat

Abstract

To provide a vehicle seat, the shape of which properly changes to allow a seated occupant to be in a comfortable posture.SOLUTION: A vehicle seat comprises: a seatback frame 20; a cover material that covers the seatback frame 20; mobile bodies 35, 37 that are provided between the seatback frame 20 and the cover material and protrude forward with respect to the seatback frame; and a control device that controls the movement of the mobile bodies 35, 37. The mobile bodies 35, 37 have: right and left shoulder part mobile bodies 35 that are provided at an upper part of the seatback frame 20; and a lower back part mobile body 37 that is provided lower at the seatback frame 20 than the shoulder part mobile bodies 35. The control device controls a protrusion amount of the shoulder part mobile bodies 35 or of the lower back part mobile body 37 on the basis of the protrusion amount of the other.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a vehicle seat, and more particularly to a vehicle seat having a movable body. [Background technology]

[0002] Vehicle seats that can change shape to fit the body shape of a seated person have been proposed. More specifically, the vehicle seats have a built-in bag. The bag expands or contracts by controlling the amount of air supplied to the bag. This allows a portion of the vehicle seat to change shape to fit the body shape of the seated person.

[0003] Patent Document 1 discloses a vehicle seat in which a bag is built into the side support portion of the seat cushion, and the shape of the cushion side support can be changed to fit the buttocks and thighs of the seated person. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-148235 Summary of the Invention [Problem to be solved by the invention]

[0005] Although the vehicle seat disclosed in Patent Document 1 can ensure support for the seated occupant, further improvement is desired. That is, it is desired to improve the support for the seated occupant while reducing fatigue and improving comfort for the seated occupant. For example, there is a need for a vehicle seat that can appropriately deform its shape to allow the seated occupant to assume a comfortable posture.

[0006] The present invention has been made in consideration of the above-mentioned problems, and its purpose is to provide a vehicle seat that can appropriately deform the shape of the vehicle seat and allow the occupant to assume a comfortable posture. [Means for solving the problem]

[0007] The above problem is solved by a vehicle seat of the present invention, which comprises a seat back frame, a cover material covering the seat back frame, a movable body disposed between the seat back frame and the cover material and protruding forward relative to the seat back frame, and a control device that controls the movement of the movable body, wherein the movable body includes left and right first movable bodies disposed in an upper portion of the seat back frame, and a second movable body disposed below the first movable bodies on the seat back frame, and the control device controls the amount of protrusion of either the first movable body or the second movable body based on the amount of protrusion of the other.

[0008] According to the above configuration, the protrusion amount of the second movable body is controlled based on the protrusion amount of the first movable body disposed above the seatback frame. As a result, for example, the protrusion of the first movable body supports the forward-bent portion of a seated occupant in a hunched posture, and the second movable body can be contracted according to the protrusion amount of the first movable body. As a result, the burden on the rearward-protruding portion of a seated occupant in a hunched posture is reduced. Furthermore, the protrusion amount of the first movable body is controlled based on the movement amount of the second movable body disposed below the back frame. As a result, for example, by protruding the second movable body, the second movable body supports the forward-bent portion of a seated occupant with a hunched back posture, and the first movable body can be contracted according to the protrusion amount of the second movable body, thereby reducing the burden on a seated occupant with a hunched back posture. In this way, the seated occupant can be appropriately supported according to their posture. In this way, by appropriately deforming the shape of the vehicle seat, the seated occupant can assume a comfortable posture.

[0009] Furthermore, it is preferable that the first movable body is a shoulder movable body that supports the shoulders of the occupant, and the second movable body is a waist movable body that supports the waist of the occupant, and when the control device controls the protruding movements of the shoulder movable body and the waist movable body, it controls so that when the protruding amount of either the shoulder movable body or the waist movable body is large, the protruding amount of the other is small. According to the above configuration, when the protrusion amount of either the shoulder movable body or the waist movable body is large, the protrusion amount of the other is controlled to be small. For example, by protruding the first movable body, both shoulders of a seated occupant with a hunched back are supported, and the second movable body can be contracted according to the protrusion amount of the first movable body. As a result, the burden on the waist of a seated occupant with a hunched back is reduced. Furthermore, the amount of protrusion of the first movable body is controlled based on the amount of movement of the second movable body disposed below the back frame. As a result, for example, by protruding the second movable body, the second movable body supports the lower back of a seated occupant with a hunched back posture, and the first movable body can be contracted according to the amount of protrusion of the second movable body, thereby reducing the burden on the seated occupant with a hunched back posture. In this way, by appropriately changing the shape of the vehicle seat, it is possible for the seated occupant to assume a comfortable posture.

[0010] It is also preferable that the movable body has an expandable and contractible bag body, and the control device acquires a pressure signal related to the pressure applied to the bag body, and controls the bag body to limit the amount of protrusion based on the pressure signal. According to the above configuration, the bag body can be prevented from expanding excessively based on the pressure signal output by the pressure sensor, so that the seated occupant can be supported appropriately according to their posture and body shape, allowing them to assume a comfortable posture.

[0011] It is also preferable that the control device acquires a steering angle signal relating to the steering angle of the vehicle, and controls the amount of protrusion of the movable body in real time based on the steering angle signal. According to the above configuration, the amount of protrusion of the movable body can be controlled in real time in response to the vehicle's driving conditions, thereby enabling the seated occupant to assume a comfortable posture in response to various driving conditions.

[0012] It is also preferable that the first movable body has an inner first movable body arranged on both the left and right sides of the seat back frame in the seat width direction, and left and right outer first movable bodies arranged at outer positions in the seat width direction of the inner first movable body. According to the above configuration, the outer first movable body is disposed outside the inner first movable body, which allows the seated occupant to be appropriately supported according to the occupant's body shape and also allows the seated occupant to be appropriately supported against loads acting in the lateral direction while traveling.

[0013] Furthermore, it is preferable that the seatback frame has left and right lower side frames extending in the vertical direction, left and right upper side frames attached to the upper ends of the left and right lower side frames and rotatable in the front-to-rear direction relative to the lower side frames, and an upper frame connecting the upper side frames, and that the first movable body is arranged in a position sandwiched between the left and right upper side frames in the seat width direction. According to the above-described configuration, by rotating the left and right upper side frames, which are rotatable in the front-rear direction relative to the lower side frames, the shape of the vehicle seat can be appropriately changed in accordance with the posture of the seated occupant, thereby enabling the seated occupant to assume a comfortable posture.

[0014] Furthermore, it is preferable that the vehicle seat includes a seat cushion frame, the seatback frame is attached to a rear end of the seat cushion frame and is rotatable in the front-to-rear direction relative to the seat cushion frame, and the control device acquires a first rotation angle signal relating to the rotation angle of the seatback frame relative to the seat cushion frame and a second rotation angle signal relating to the rotation angle of the upper side frame relative to the lower side frame, and controls the amount of protrusion of the movable body based on the first rotation angle signal and the second rotation angle signal. According to the above configuration, the amount of protrusion of the movable body is controlled in accordance with the rotation angle and the bending angle of the seat cushion frame, thereby enabling the seated occupant to assume a comfortable posture.

[0015] Preferably, the vehicle seat further includes a lifting mechanism that supports the first movable body relative to the seatback frame so that the first movable body can be raised and lowered in the vertical direction. According to the above configuration, the first movable body can be raised and lowered in the vertical direction to match the body shape of the seated occupant, thereby enabling the seated occupant to assume a comfortable posture.

[0016] It is also preferable that the lifting mechanism supports the second movable body relative to the seat back frame so that it can be raised and lowered in the vertical direction, and that the control device controls the lifting mechanism to raise and lower the first movable body in accordance with the vertical position of the second movable body. According to the above configuration, the first movable body rises and falls in accordance with the vertical position of the second movable body, which is disposed below the first movable body. This allows the first movable body to protrude in conjunction with the second movable body to match the body shape of the seated person, and the vehicle seat can be appropriately deformed to match the body shape of the seated person. This allows the seated person to assume a comfortable posture.

[0017] Furthermore, the movable body has left and right third movable bodies arranged at a position between the first movable body and the second movable body in the vertical direction of the seat back frame, and the third movable bodies have multiple inflatable and deflatable bag bodies, and it is preferable that the multiple bag bodies are stacked, have different sizes from each other, and are arranged in different orientations from each other. According to the above configuration, the support for the seated occupant can be enhanced by supporting the seated occupant with the third movable body in addition to the first and second movable bodies. Also, the third movable body can be deformed to a flexible shape and size, making it possible to support the seated occupant appropriately according to the body shape of the seated occupant. [Effects of the Invention]

[0018] According to the present invention, by appropriately changing the shape of the vehicle seat, it is possible for the seated occupant to assume a comfortable posture. Furthermore, the seated person can be supported appropriately according to their posture and body shape, allowing them to assume a comfortable posture. It also allows the seated person to adopt a comfortable posture in response to various driving conditions. Furthermore, the seated occupant can be supported appropriately according to the occupant's body shape, and the seated occupant can be supported appropriately against loads acting in the left and right directions while traveling. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is an explanatory diagram of a basic configuration of a vehicle seat according to a first embodiment. [Figure 2] FIG. [Figure 3] FIG. [Figure 4A] 2 is a cross-sectional view taken along line AA in FIG. 1, showing a state in which the shoulder fluid bag is contracted. FIG. [Figure 4B] 2 is a cross-sectional view taken along line AA in FIG. 1, showing a state in which the shoulder fluid bladder is inflated. [Figure 5]FIG. 2 is a block diagram showing the functional configuration of a seat frame. [Figure 6] FIG. 2 is a block diagram showing the functional configuration of an ECU. [Figure 7A] 10A and 10B are diagrams showing the inflated and deflated states of the shoulder fluid bladders and the lumbar fluid bladders when the posture of the seated occupant is determined to be hunched. [Figure 7B] 10A and 10B are diagrams showing the inflated and deflated states of the shoulder fluid bladders and the lumbar fluid bladders when the posture of the seated occupant is determined to be arched back. [Figure 8] FIG. 10 is a front view showing a first modified example of a seat back frame. [Figure 9] FIG. 10 is a front view showing a second modified example of the seat back frame. [Figure 10A] 9, showing a state in which the plate is in a normal position. FIG. [Figure 10B] FIG. 10 is a diagram showing the plate in a protruding position. [Figure 11A] 9, showing a state in which the fluid bag is in a normal position. FIG. [Figure 11B] FIG. 10 is a diagram showing a state in which the fluid bag is in a protruding position. [Figure 12] FIG. 10 is a perspective view of a seat frame according to a second embodiment. [Figure 13] FIG. 2 is a side view of the seat frame, showing an enlarged view of a main part. [Figure 14] FIG. 2 is a block diagram showing the functional configuration of an ECU. [Figure 15] FIG. 11 is a perspective view of a seat back frame according to a third embodiment. [Figure 16] FIG. 10 is a view showing a state in which the support device is removed from the seat back frame. [Figure 17] FIG. [Figure 18] FIG. 10 is an explanatory diagram of a basic configuration of a vehicle seat according to a fourth embodiment. [Figure 19] FIG. [Figure 20] 20 is a cross-sectional view taken along line CC in FIG. 19, showing a state in which the side fluid bladder is inflated. FIG. [Figure 21] FIG. 11 is a perspective view of a seat cushion frame according to a fifth embodiment. [Figure 22] FIG. [Figure 23] FIG. 13 is a top view of a seat cushion frame according to a sixth embodiment. [Figure 24] FIG. 13 is a top view of a seat cushion frame according to a seventh embodiment. [Figure 25] 10 is a diagram schematically illustrating a state in which a torsion spring biases a support member upward. FIG. [Figure 26] FIG. 10 is a diagram schematically illustrating a state in which the thigh fluid bladder urges the support member upward. [Figure 27] 10 is a diagram schematically illustrating a state in which a cam-shaped elastic rotating body urges a support member upward. FIG. [Figure 28] FIG. 13 is a perspective view of a seat cushion frame according to an eighth embodiment. [Figure 29] FIG. 29 is a cross-sectional view of FIG. 28, illustrating the length adjustment mechanism. [Figure 30] FIG. 4 is a diagram illustrating a configuration of a length adjustment mechanism for a seat cushion. [Figure 31] FIG. 13 is an explanatory diagram of a basic configuration of a vehicle seat according to a ninth embodiment. [Figure 32] 3 is a perspective view of a pad main body, a first cover member, and a second cover member of the seat cushion. FIG. [Figure 33] FIG. 20 is an explanatory diagram of the basic configuration of a vehicle seat according to a tenth embodiment. [Figure 34] 1 is a partial cross-sectional view of a vehicle seat as viewed from the side; [Figure 35] FIG. 2 is a block diagram showing the functional configuration of an ECU. [Figure 36] FIG. 2 is a partial cross-sectional view showing a state in which the airbag is deflated, in which a main part of the seat cushion is enlarged. [Figure 37] FIG. 2 is a partial cross-sectional view showing a state in which the front of the airbag is inflated, and is an enlarged view of a main part of the seat cushion. [Figure 38]FIG. 2 is a diagram showing a flow of processing executed by an ECU. [Figure 39] FIG. 20 is an explanatory diagram of a basic configuration of a vehicle seat according to an eleventh embodiment. [Figure 40] 10A and 10B are diagrams illustrating a contracted state and a protruded state of the fluid bag. [Figure 41] FIG. 23 is an explanatory diagram of a basic configuration of a vehicle seat according to a twelfth embodiment. [Figure 42] 42 is a cross-sectional view taken along the line AA in FIG. 41. [Figure 43] 42 is a cross-sectional view taken along the line AA in FIG. 41, showing an example in which a recessed portion of a seat cushion pad is provided with a protruding portion. FIG. [Figure 44] 10A and 10B are diagrams showing a connector housed in a recess of a seat cushion pad. [Figure 45] FIG. 10 is a top view showing a seat cushion pad according to a modified example. [Figure 46] 46 is a cross-sectional view of FIG. 45 taken along line B-B. DETAILED DESCRIPTION OF THE INVENTION

[0020] First Embodiment A vehicle seat according to a first embodiment of the present invention will be described below with reference to the drawings. However, the embodiment described below is intended to facilitate understanding of the present invention and does not limit the present invention. In other words, the present invention may be modified or improved without departing from the spirit thereof, and of course, the present invention also includes equivalents thereof.

[0021] In the following description, the "front-rear direction" refers to the front-rear direction as seen from the occupant of the vehicle seat, and is the direction that coincides with the direction of travel of the vehicle. The "seat width direction" refers to the width direction of the vehicle seat, and coincides with the left-right direction as seen from the occupant of the vehicle seat. In the following, "left" refers to the left as seen from the occupant, and similarly, "right" refers to the right as seen from the occupant. The "height direction" refers to the height direction of the vehicle seat, and coincides with the up-down direction as seen from the front of the vehicle seat.

[0022] In the following description, when various directions are described with the word "seat" added, such as "seat width direction" and "seat height direction," they indicate directions relative to the vehicle seat. When various directions are described with the word "vehicle" added, such as "vehicle inside" and "vehicle outside," they indicate directions relative to the vehicle. In addition, the "outside of the vehicle" in the seat width direction means the side closer to the outside of the vehicle body (or, more simply, the side closer to the nearest door), and the "inside of the vehicle" means the side closer to the inside of the vehicle body (or, more simply, the side farther from the nearest door).

[0023] A vehicle seat S1 according to a first embodiment will be described with reference to FIGS.

[0024] <<Main components of vehicle seats>> First, the basic structure of a vehicle seat S1 will be described with reference to FIG. Fig. 1 is a perspective view showing the basic configuration of a vehicle seat S1. As shown in Fig. 1, the vehicle seat S1 has a seat cushion S11, a seat back S12, and a headrest S13. The seat cushion S11 is constructed by covering a seat cushion frame 10 (see FIG. 2) with a seat cushion pad S11a and a covering material S11b. The seat back S12 is constructed by covering a seat back frame 20 (see FIG. 2) with a seat back pad S12a and a covering material S12b. The headrest S13 is constructed by covering a pillar S13c with a headrest pad S13a and a covering material S13b.

[0025] The seat back S12 also incorporates, between the seat back frame 20 and the covering material S12b, left and right shoulder supports 30 and a lumbar support 35. The left and right shoulder supports 30 and the lumbar support 35 will be described later.

[0026] 2 is a perspective view of the seat frame 1. The vehicle seat S1 includes, as its framework, the seat frame 1. The seat frame 1 includes a seat cushion frame 10 and a seat back frame 20 as main components. The seat frame 1 is fixed via a height adjustment mechanism 4 to a slide mechanism 3 that slides the vehicle seat S1 in the front-rear direction.

[0027] The seat cushion frame 10 is mainly composed of cushion side frames 11 as side frames, a pan frame 12, a rear pipe 13 as a connecting pipe, and a plurality of elastic springs 14.

[0028] The cushion side frames 11 are arranged one on each side of the seat cushion frame 10. The cushion side frames 11 extend in the front-rear direction.

[0029] The pan frame 12 is interposed between the front ends of the left and right cushion side frames 11 and connects the left and right cushion side frames 11 together. The rear pipe 13 is interposed between the rear ends of the left and right cushion side frames 11 and connects the left and right cushion side frames 11 together.

[0030] Each elastic spring 14 is hooked to the pan frame 12 and the rear pipe 13 and extends in the front-to-rear direction of the seat in a serpentine manner.

[0031] Next, the seat back frame 20 is a substantially rectangular frame-like body, as shown in Fig. 2. The seat back frame 20 is capable of rotating relative to the seat cushion frame 10 about a rotation axis 2 as the center.

[0032] The seat back frame 20 is mainly composed of left and right back side frames 21, an upper frame 22, and a lower frame 23. The seat back frame 20 further includes a horizontal connecting frame 24 that connects the upper portions of the left and right back side frames 21 together, and a vertical connecting frame 25 that connects the upper frame 22 and the horizontal connecting frame 24 together.

[0033] The back side frames 21 are disposed on the left and right sides of the seat back frame 20. The back side frames 21 extend in the up-down direction. The back side frames 21 are made of plate-shaped members.

[0034] The upper frame 22 connects the upper ends of the left and right back side frames 21. The upper frame 22 is a pipe-like body having an inverted U-shape. The lower frame 23 connects the lower ends of the left and right back side frames 21. The lower frame 23 is a plate-like body. The upper frame 22 and the lower frame 23 extend in the seat width direction.

[0035] The horizontal connecting frame 24 connects the upper portions of the left and right seat back frames 20. The horizontal connecting frame 24 is a plate-shaped body. The horizontal connecting frame 24 extends in the seat width direction. The vertical connecting frames 25 are installed between the upper frame 22 and the horizontal connecting frames 24 on both sides of the horizontal connecting frames 24 in the seat width direction. The vertical connecting frames 25 have a rectangular cross section and extend in the vertical direction.

[0036] A shoulder support 30 is attached to the upper portion of the seat back frame 20, more specifically, to the front surface of the vertical connecting frame 25. A lumbar support 35 is disposed below the shoulder support 30, between the horizontal connecting frame 24 and the lower frame 23. The lumbar support 35 is supported by a wire member 26 stretched between the horizontal connecting frame 24 and the lower frame 23.

[0037] The wire members 26 are arranged one on each side of the seat back frame 20. In detail, the wire members 26 are stretched vertically on both the left and right sides of the horizontal connecting frame 24 and on both the left and right sides of the lower frame 23. The seat back frame 20 also includes a pillar mounting member 27 for mounting a pillar S13c of the headrest S13 at the center of the upper frame 22 in the seat width direction.

[0038] As shown in Fig. 3, left and right shoulder supports 30 that support the shoulders of a seated occupant are attached to the front of the left and right vertical connecting frames 25. The shoulder support 30 has a shoulder support plate 31 that functions as a base material and a shoulder fluid bag 32 arranged on the shoulder support plate 31.

[0039] A lumbar support 35 that supports the lower back of the seated person is attached to the wire member 26. The lumbar support 35 has a lower back support plate 36 that functions as a base material, and a lower back fluid bag 37 arranged on the lower back support plate 36.

[0040] <<About Shoulder Support 30>> The shoulder supports 30 are attached to the rear surface of the seat back pad S12a on the left and right sides in the seat width direction above the seat back S12. The shoulder supports 30 are attached to the front surface of the vertical connecting frame 25 at the overlapping portion where the horizontal connecting frame 24 is connected. The shoulder support plate 31 constituting the shoulder support 30 is a plate member that is long in the seat width direction. The shoulder support plate 31 spans between the front surface of the vertical connecting frame 25 and the front surface of the back side frame 21.

[0041] The shoulder fluid bags 32 are disposed on the front side of the left and right shoulder support plates 31. The shoulder fluid bags 32 have a hexagonal shape that is long in the seat width direction, and extend so as to protrude outward from the vertical connecting frame 25 in the seat width direction. As shown in FIG. 4A, three shoulder fluid bags 32 are disposed on the front surface of the shoulder support plate 31.

[0042] The shoulder fluid bag 32 is attached to the shoulder support plate 31 by a mounting member 33 provided on the inner end in the seat width direction of the front surface of the shoulder support plate 31. When compressed air is injected into the shoulder fluid bag 32 in a deflated state, the shoulder fluid bag 32 bulges and protrudes toward the front of the seat.

[0043] The three shoulder fluid bladders 32 are different in size. Specifically, the capacity of the first shoulder fluid bladder 32a, which is located closest to the front of the seat, is smaller than the capacities of the second shoulder fluid bladder 32b and the third shoulder fluid bladder 32c. The capacity of the second shoulder fluid bladder 32b, which is located rearward of the first shoulder fluid bladder 32a, is larger than the capacities of the first shoulder fluid bladder 32a and the third shoulder fluid bladder 32c. The capacity of the third shoulder fluid bladder 33c, which is located rearward of the second shoulder fluid bladder 32b, is larger than the capacity of the first shoulder fluid bladder 32a but smaller than the capacity of the second shoulder fluid bladder 32b.

[0044] 4A and 4B, when compressed air is injected into the first shoulder fluid bladder 32a, the second shoulder fluid bladder 32b, and the third shoulder fluid bladder 32c, they expand and protrude in different directions. In this way, the first shoulder fluid bladder 32a, the second shoulder fluid bladder 32b, and the third shoulder fluid bladder 32c are arranged in different directions, and when compressed air is injected, they expand and contract (expand and contract) in different directions and with different volumes (amounts of protrusion). This makes it possible to flexibly adjust the direction and amount of protrusion of the seat back S12. The first shoulder fluid bladder 32a, the second shoulder fluid bladder 2b, and the third shoulder fluid bladder 32c may be inflated and protruded in the initial state (normal state). This can prevent wrinkles and sagging from occurring in the upholstery material S12b of the seat back S12. The number of shoulder fluid bladders 32 is not limited to three. Two shoulder fluid bladders 32 may be provided, or four or more shoulder fluid bladders 32 may be provided. The shoulder fluid bag 32 corresponds to the bag body and the movable body, and also corresponds to the first movable body and the shoulder movable body.

[0045] The operation of the shoulder fluid bladder 32 configured as above will now be described. The ECU 50, which will be described later, controls the flow of compressed air supplied to the shoulder fluid bladder 32. This causes the shoulder support 30 to deform between the contracted state shown in Fig. 4A and the protruding state shown in Fig. 4B.

[0046] 4A is a cross-sectional view taken along line AA in FIG. 1, showing the contracted state of the shoulder support 30. The shoulder fluid bladder 32 is in a contracted state between the shoulder support plate 31 and the upholstery material S12b in the seat front-rear direction.

[0047] 4B is a cross-sectional view taken along line AA in FIG. 1, illustrating the protruding state of the shoulder support 30. The shoulder fluid bag 32 is arranged in an inflated state and protrudes forward between the shoulder support plate 31 and the upholstery material S12b in the seat front-rear direction. More specifically, the deflated shoulder fluid bag 32 expands when compressed air is supplied from the actuator 55, which will be described later. This causes the portion of the seat back S12 that supports the shoulders of the seated occupant to deform toward the front of the seat and assumes the protruding state shown in FIG. 4B.

[0048] Furthermore, when the compressed air injected into the shoulder fluid bag 32 is discharged, the shoulder fluid bag 32 contracts, causing the portion of the seat back S12 that supports the shoulders of the seated occupant to deform toward the rear of the seat and return to the contracted state shown in FIG.

[0049] <<About Lumbar Support 35>> Returning to Fig. 3, the lumbar support 35 will be described. The lumbar support 35 is attached to the rear surface of the seat back pad S12a below the shoulder supports 30 of the seat back S12. The lumbar support plate 36 constituting the lumbar support 35 is a plate member having a substantially rectangular shape. The lumbar support plate 36 is bridged between the left and right wire members 26.

[0050] A lumbar fluid bag 37 is supported on the front surface of the lumbar support plate 36. Similar to the shoulder fluid bag 32, the lumbar fluid bag 37 has a plurality of lumbar fluid bags 37. The plurality of lumbar fluid bags 37 may have the same capacity as one another, or may have different capacities from one another. The waist fluid bag 37 corresponds to the bag body and the movable body, and also corresponds to the second movable body and the waist movable body.

[0051] The ECU 50, which will be described later, controls the flow of compressed air to the lumbar fluid bladder 37. This causes the lumbar support 35 to deform between the contracted state and the protruding state. The lumbar fluid bladder 37 is inflated from a contracted state by receiving a supply of compressed air from an actuator 55, which will be described later, causing the portion of the seat back S12 that supports the lumbar region of the seated occupant to protrude forward of the seat. Furthermore, when the compressed air injected into the lumbar fluid bag 37 is discharged, the lumbar fluid bag 37 contracts, causing the portion of the seat back S12 that supports the occupant's lumbar region to deform toward the rear of the seat and return to a contracted state.

[0052] <<Functional Configuration of Vehicle Seat S1>> Next, the functional configuration of the vehicle seat S1 will be described. 5 shows the functional configuration of the vehicle seat S1. As described above, the vehicle seat S1 has the shoulder fluid bladder 32 and the lumbar fluid bladder 37. Compressed air is supplied to the shoulder fluid bladder 32 and the lumbar fluid bladder 37 by an actuator 55. The compressed air supplied from the actuator 55 is injected into the shoulder fluid bladder 32 and the lumbar fluid bladder 37 through a tube that forms an air supply path. Each air supply path is provided with an electromagnetic valve 56 for adjusting the amount of compressed air injected.

[0053] The fluid injected into the shoulder fluid bladders 32 and the waist fluid bladders 37 is not limited to compressed air. The shoulder fluid bladders 32 and the waist fluid bladders 37 may be inflated by injecting a liquid. The shoulder fluid bladders 32 and the waist fluid bladders 37 may be either compressed air bladders that are inflated by compressed air or liquid bladders that are inflated by liquid, or a combination of compressed air bladders and liquid bladders. Because compressed air and liquid have different elastic moduli, the elasticity of the shoulder fluid bladders 32 and the waist fluid bladders 37 can be flexibly adjusted by combining compressed air bladders and liquid bladders.

[0054] The vehicle seat S1 may also have a built-in heater 57. By having the vehicle seat S1 have a built-in heater 57, it becomes possible to warm the body of the seated occupant from the back, thereby improving the comfort of the seated occupant, especially in winter. The vehicle seat S1 may also incorporate a vibration imparting device 58. By incorporating the vibration imparting device 58 in the vehicle seat S1, it becomes possible to promote blood flow and reduce fatigue of a seated occupant who drives for a long period of time.

[0055] The vehicle seat S1 is equipped with a control device that controls the above-mentioned actuator 55 and solenoid valve 56. The control device is made up of an ECU (Electronic Control Unit) 50 mounted in the vehicle. The ECU 50 controls the inflation and deflation of the shoulder fluid bladder 32 and the lumbar fluid bladder 37 by controlling the on / off of the actuator 55 and the opening of the solenoid valve 56. As a result, the shoulder and lumbar regions of the vehicle seat S1 are deformed to fit the body shape of the seated occupant, improving support for the seated occupant.

[0056] The ECU 50 also communicates with various sensors installed in the vehicle via an in-vehicle network to acquire detection values ​​from the various sensors. The various sensors include a weight sensor 40 capable of detecting the seating state, a vehicle speed sensor 41 capable of detecting the vehicle speed, a steering angle sensor 42 capable of detecting the steering angle, a pressure sensor 43 for the shoulder fluid bladders 32 and the waist fluid bladders 37, an inflation pressure sensor 44, and a rotation angle sensor 45.

[0057] The weight sensor 40 detects the load acting on the vehicle seat S1. Based on the detected value of the weight sensor 40, the ECU 50 can determine whether or not a person is seated. The vehicle speed sensor 41 and the steering angle sensor 42 detect the vehicle's running state. Based on the detection results of the vehicle speed sensor 41 and the steering angle sensor 42, the ECU 50 estimates the vehicle's running state and controls the shoulder fluid bladders 32 and the lumbar fluid bladders 37 in real time so that they expand and contract based on the estimation result. In other words, the amount of compressed air injected into the shoulder fluid bladders 32 and the lumbar fluid bladders 37 is controlled so that the seated occupant can assume an appropriate posture depending on the vehicle's running state.

[0058] An inflation pressure sensor 44 is attached to each of the shoulder fluid bladders 32 and the lumbar fluid bladders 37 to detect the pressure of the compressed air injected into them. A pressure sensor 43 is attached to each of the fluid bladders to detect the load of a seated occupant. The pressure sensors 43 are attached to the front of the shoulder fluid bladders 32 and the lumbar fluid bladders 37. The ECU 50 controls the amount of compressed air injected into the shoulder fluid bladders 32 and the lumbar fluid bladders 37 based on the pressure signals output by the pressure sensor 43 and the inflation pressure sensor 44. The ECU 50 also stops the injection of compressed air based on the pressure signals output by the pressure sensor 43 and the inflation pressure sensor 44 to prevent the shoulder fluid bladders 32 and the lumbar fluid bladders 37 from being overinflated.

[0059] The rotation angle sensor 45 detects the rotation angle of the seat back S12 relative to the seat cushion S11. Based on the detection value of the rotation angle sensor 45, the ECU 50 can determine whether the seat back S12 is in a reclined state where it has been rotated rearward. When the ECU 50 determines that the seat back S12 is in a reclined state, it injects compressed air into the shoulder fluid bladders 32 and the lumbar fluid bladders 37 to effectively support the shoulders and lumbar regions of a seated occupant who is resting.

[0060] FIG. 5 shows a weight sensor 40, a vehicle speed sensor 41, a steering angle sensor 42, a pressure sensor 43, a bulging pressure sensor 44, and a rotation angle sensor 45, but is not limited thereto. For example, a road surface sensor that detects the road surface condition by imaging the road surface condition during traveling may be included. Further, the vehicle seat S1 may be able to detect the driving mode of the vehicle (for example, being in the automatic driving mode during traveling).

[0061] <<Regarding the functional configuration of the ECU>> FIG. 6 shows the functional configuration of the ECU 50. As shown in FIG. 6, the ECU 50 mainly includes an acquisition unit 51, a determination unit 52, and a drive unit 53. The ECU 50 loads a program from a non-volatile memory (not shown) and functions as the acquisition unit 51, the determination unit 52, and the drive unit 53 by being executed by a processor (not shown) which is a hardware resource.

[0062] The acquisition unit 51 acquires the detection values of various sensors installed in the vehicle. Specifically, the acquisition unit 51 acquires the detection values of the weight sensor 40, the vehicle speed sensor 41, the steering angle sensor 42, the pressure sensor 43, the bulging pressure sensor 44, and the rotation angle sensor 45. The acquisition unit 51 has an ADC (analog-to-digital converter) and can convert the analog signals output by various sensors into digital signals. Further, the acquisition unit 51 has a noise removal filter and can improve the signal power-to-noise power ratio (S / N ratio) by removing signals in the frequency band consisting of noise components.

[0063] The determination unit 52 determines the seating posture of the seated person based on the detection values acquired by the acquisition unit 51. More specifically described, the determination unit 52 determines which of the five types of "hunchback", "slightly hunched", "ideal posture", "slightly arched back", and "arched back" corresponds to the seating posture of the seated person.

[0064] The determination unit 52 has a determination condition table that defines the determination conditions for determining which of the five seating postures the seated person is in. The determination unit 52 then determines the seating posture of the seated person by comparing the detected values ​​of the pressure sensor 43 and the inflation pressure sensor 44 with the determination conditions defined in the determination condition table.

[0065] The seating postures to which the detected values ​​of the pressure sensor 43 and the inflation pressure sensor 44 correspond can be arbitrarily set by editing the judgment condition table. In addition, the seating posture candidates are not limited to the above five postures, and can be arbitrarily determined.

[0066] Based on the determination result of the determination unit 52, the drive unit 53 outputs control signals to the actuator 55 and the solenoid valve 56 so that the seated occupant can assume an appropriate posture. This causes the shoulder fluid bladders 32 and the lumbar fluid bladders 37 to expand and protrude or contract. The determination result of the determination unit 52 and the inflation / deflation control of the shoulder fluid bladders 32 and the lumbar fluid bladders 37 by the drive unit 53 will be described in more detail with reference to Figures 7A and 7B.

[0067] FIG. 7A shows the inflated and deflated states of the shoulder fluid bladder 32 and the lumbar fluid bladder 37 when the determination unit 52 determines that the seated posture of the seated occupant is "hunched." As shown in FIG. 7A, when "hunched" is determined, the drive unit 53 greatly inflates the shoulder fluid bladder 32. The drive unit 53 then deflates the lumbar fluid bladder 37 based on the amount of protrusion (i.e., the amount of expansion) of the shoulder fluid bladder 32. This reduces the burden on the occupant's back, which bends to protrude backward, thereby reducing fatigue and improving comfort. Here, the amount of protrusion of the shoulder fluid bladder 32 can be estimated based on the output signal of the expansion pressure sensor 44 attached to the shoulder fluid bladder 32. Alternatively, the amount of protrusion of the shoulder fluid bladder 32 may be estimated based on the opening degree of the solenoid valve 56.

[0068] FIG. 7B shows the inflated and deflated states of the shoulder fluid bladder 32 and the lumbar fluid bladder 37 when the determination unit 52 determines that the seated occupant's sitting posture is "arched lower back." As shown in FIG. 7B, when "arched lower back" is determined, the drive unit 53 greatly inflates the lumbar fluid bladder 37. The drive unit 53 then deflates the shoulder fluid bladder 32 based on the protrusion amount (i.e., the expansion amount) of the lumbar fluid bladder 37. This appropriately supports the occupant's back, which bends forward, thereby reducing the burden on the occupant and reducing fatigue and improving comfort. The protrusion amount of the lumbar fluid bladder 37 can be estimated based on the output signal of the inflation pressure sensor 44 attached to the lumbar fluid bladder 37. Alternatively, the protrusion amount of the lumbar fluid bladder 37 may be estimated based on the opening degree of the solenoid valve 56.

[0069] In this way, when controlling the shoulder fluid bladders 32 and the lumbar fluid bladders 37 to protrude, the drive unit 53 controls in real time so that when the amount of protrusion of one of the shoulder fluid bladders 32 and the lumbar fluid bladders 37 is large, the amount of protrusion of the other is reduced. Here, "real time" means that the amount of protrusion of either the shoulder fluid bladders 32 or the lumbar fluid bladders 37 is detected to be large and the drive unit 53 simultaneously controls the amount of protrusion of the other to be reduced, but this does not have to be strictly simultaneous. For example, it is sufficient that a difference in the timing of inflation and deflation of the shoulder fluid bladders 32 and the lumbar fluid bladders 37 does not cause discomfort to the seated occupant.

[0070] Here, the drive unit 53 compares the pressure signal output by the inflation pressure sensor 44 with a predetermined threshold value and stops or limits the supply of compressed air based on the comparison result. In other words, when the detected value of the inflation pressure sensor 44 exceeds a predetermined value, the amount of compressed air supplied to the shoulder fluid bladders 32 and the lumbar fluid bladders 37 is limited. This prevents the shoulder fluid bladders 32 and the lumbar fluid bladders 37 from expanding excessively, and allows the occupant to be supported appropriately according to their posture and body shape. This allows the occupant to assume a comfortable posture.

[0071] The drive unit 53 may also control the amount of compressed air injected into the shoulder fluid bladders 32 and the lumbar fluid bladders 37 based on the detection values ​​of the vehicle speed sensor 41 and the steering angle sensor 42. For example, the drive unit 53 may estimate the load acting on the seated occupant based on the vehicle speed signal output by the vehicle speed sensor 41 and the steering angle signal output by the steering angle sensor 42, and inflate the shoulder fluid bladders 32 and the lumbar fluid bladders 37 in real time based on the estimation result. This makes it possible to quickly improve the support for the seated occupant. The drive unit 53 may control the inflation and deflation of the shoulder fluid bladders 32 and the lumbar fluid bladders 37 based on the output signal of the road surface sensor described above, a signal related to the driving mode (for example, a signal indicating that the vehicle is being driven in autonomous driving mode), or an output signal of the rotation angle sensor 45. This makes it possible to flexibly support the occupant according to the driving situation and the occupant's posture, thereby reducing the burden on the occupant.

[0072] Although the driving unit 53 has been described as controlling the actuator 55 and the solenoid valve 56 based on the determination result of the determination unit 52, this is not limiting. The driving unit 53 may control the amount of protrusion of either the shoulder fluid bladder 32 or the lumbar fluid bladder 37 based on the amount of protrusion of the other, regardless of the determination result of the determination unit 52. This makes it possible to more quickly control the amount of protrusion of the shoulder fluid bladder 32 and the lumbar fluid bladder 37. However, by determining the posture of the seated occupant using the determination unit 52 and controlling the shoulder fluid bladder 32 and the lumbar fluid bladder 37 to expand and contract based on the determination result, it is possible to more accurately support the seated occupant according to their posture. This allows the seated occupant to assume a comfortable posture.

[0073] <<First Modification>> The configuration of the vehicle seat S1 has been described above, but the above-described embodiment is merely an example for facilitating understanding of the present invention and does not limit the present invention. In other words, the present invention can be modified and improved without departing from the spirit thereof, and of course, the present invention includes equivalents thereof.

[0074] A shoulder support 30A according to a first modified example will be described with reference to Fig. 8. In the above embodiment, the shoulder support 30 has been described as having a shoulder support plate 31 and a shoulder fluid bladder 32. In contrast, the shoulder support 30A according to the first modified example has a shoulder support plate 31, an inner shoulder fluid bladder 32A disposed on the inside in the left-right direction, and an outer shoulder fluid bladder 32B disposed on the outside.

[0075] The inner shoulder fluid bladder 32A and the outer shoulder fluid bladder 32B are respectively equipped with the pressure sensor 43 and the inflation pressure sensor 44. The ECU 50 controls the supply of compressed air based on the detected values ​​of the pressure sensor 43 and the inflation pressure sensor 44. Specifically, the determination unit 52 of the ECU 50 determines the body shape of the seated occupant (more specifically, the shoulder width of the seated occupant) based on the detected values ​​of the pressure sensor 43 and the inflation pressure sensor 44. If the determination unit 52 estimates that the shoulder width of the seated occupant is narrow, the drive unit 53 inflates the inner shoulder fluid bladder 32A. On the other hand, if the determination unit 52 estimates that the shoulder width of the seated occupant is wide, the drive unit 53 inflates the outer shoulder fluid bladder 32B. This makes it possible to improve the support for the seated occupant according to the body shape of the seated occupant.

[0076] The drive unit 53 also estimates the centrifugal force acting on the occupant based on the detection values ​​of the vehicle speed sensor 41 and the steering angle sensor 42, and inflates the inner shoulder fluid bladder 32A and the outer shoulder fluid bladder 32B based on the estimation result. This makes it possible to appropriately support the occupant against the centrifugal force acting on the occupant while driving. The inner shoulder fluid bag 32A corresponds to the inner first movable body, and the outer shoulder fluid bag 32B corresponds to the outer first movable body.

[0077] <<Second Modification>> Next, a vehicle seat S1 according to a second modified example will be described. The vehicle seat S1 according to the second modified example is provided with a biasing member 34 on the inner side in the seat width direction of the shoulder support 30. The biasing member 34 biases the seat back pad S12a and the upholstery material S12b around the shoulder blades of the seated occupant forward.

[0078] Fig. 9 is a front view of a seat back frame 20B according to the second modification. As shown in Fig. 9, in the seat back frame 20B according to the second embodiment, a biasing member 34 is attached to the front surface of the horizontal connecting frame 24, inside the shoulder support 30 in the seat width direction.

[0079] As shown in Fig. 10A, the biasing member 34 includes a plate 34a, a pivot shaft 34b, and an elastic member (not shown). The plate 34a is biased forward by an elastic member made of a torsion spring. As shown in Fig. 10B, the plate 34a rotates about the pivot shaft 34b extending in the vertical direction, causing the seat back pad S12a and the upholstery material S12b located in front of the plate 34a to protrude forward. This prevents the back of the seated occupant around the shoulder blades from moving away from the seat back S12 when the seated occupant steers the steering wheel, thereby improving support for the back of the seated occupant.

[0080] The configuration of the biasing member 34 is not limited to that described above. For example, although the elastic member has been described as a torsion spring, it may be a fluid bag. In this case, the plate 34a is biased forward by supplying fluid to the fluid bag. The biasing force can be flexibly adjusted by controlling the fluid supplied to the fluid bag.

[0081] <<Third Modification>> The biasing member 34 according to the third modification has a fluid bag 34c instead of a plate 34a. As shown in FIG. 11A, the biasing member 34 has a fluid bag 34c, a pivot shaft 34b, and an elastic member (not shown). The fluid bag 34c is biased forward by an elastic member, such as a torsion spring. As shown in FIG. 11B, the fluid bag 34c rotates about the pivot shaft 34b extending in the vertical direction, causing the seatback pad S12a and the upholstery material S12b located in front of the fluid bag 34c to protrude forward. This improves support for the back of the seated occupant around the shoulder blades. Furthermore, by controlling the compressed air supplied to the fluid bag 34c, the protrusion amount of the seatback pad S12a and the upholstery material S12b can be flexibly adjusted. Further, the expansion and contraction of the fluid bladder 34c may be controlled based on the detection values ​​of the vehicle speed sensor 41 and the steering angle sensor 42, and the protrusion amounts of the seat back pad S12a and the upholstery material S12b may be adjusted in real time.

[0082] Second Embodiment A vehicle seat according to the second embodiment will be described below with reference to Figures 12 to 14. The vehicle seat according to the second embodiment has a folding seatback frame 220. The vehicle seat according to the second embodiment also has a rotation angle sensor 245 capable of detecting the rotation angle of the seatback frame 220 relative to the seat cushion frame 210, and a folding angle sensor 246 capable of detecting the folding angle of the seatback frame 220. An ECU 250 that controls the vehicle seat determines that the vehicle seat is in a reclined state based on the detection values ​​of the rotation angle sensor 245 and the folding angle sensor 246, and controls the inflation and deflation of a shoulder fluid bladder 232 disposed in a shoulder support 230 based on the determination result.

[0083] <<Main components of the seat frame>> 12 is a perspective view of a seat frame 201 according to the second embodiment. The seat frame 201 includes a seat cushion frame 210 and a seat back frame 220 as main components.

[0084] The seatback frame 220 is a substantially rectangular frame-shaped body that is rotatable about a rotation axis 202 relative to the seat cushion frame 210. The seatback frame 220 is mainly composed of left and right backside frames 221, an upper frame 222, and a lower frame 223. The seat back frame 220 further includes a horizontal connecting frame 224 that connects the upper portions of the left and right back side frames 221 together, and a vertical connecting frame 225 that connects the upper frame 222 and the horizontal connecting frame 224 together.

[0085] The back side frames 221 are arranged one on each side of the seat back frame 220. The back side frames 221 extend in the up-down direction. The back side frame 221 has a lower side frame 221a, a connecting frame 221b attached to the upper end of the lower side frame 221a and rotatable in the front-to-rear direction relative to the lower side frame 221a, and a drive mechanism 260 that rotates the connecting frame 221b.

[0086] A lower frame 223 is installed at the lower end portions of the left and right lower side frames 221a, connecting the lower side frames 221a. The left and right connecting frames 221b are connected to the upper ends of the lower side frames 221a so as to be rotatable around a folding shaft 227. The connecting frames 221b connect the left and right lower side frames 221a to vertical portions 222a extending in the up-down direction below the upper frame 222. The connecting frames 221b and the vertical portions 222a correspond to upper side frames.

[0087] The upper frame 222 has horizontal portions 222b that are interposed between the vertical portions 222a and connect the vertical portions 222a. The horizontal portions 222b correspond to the upper frame.

[0088] Shoulder supports 230 that support the shoulders of a seated occupant are attached to the left and right vertical connecting frames 225. A shoulder fluid bag 232 is disposed on the front surface of the shoulder support 230. The shoulder fluid bag 232 is disposed at a position sandwiched between the left and right vertical portions 222a in the seat width direction.

[0089] A lumbar support 235 that supports the lumbar region of the seated person is disposed below the shoulder support 230 and is supported by a wire member 226. A lumbar fluid bag 237 is disposed in front of the shoulder support 230. The shoulder fluid bladder 232 and the lumbar fluid bladder 237 are supplied with fluid and inflated when the backside frame 221 is in a reclined position, thereby improving the comfort of the occupant who is relaxing in the vehicle seat S201.

[0090] Next, the drive mechanism 260 will be described. 13 is a side view of the backside frame 221, showing an enlarged view of a main part of the drive mechanism 260. The drive mechanism 260 has an actuator 261, a link member 262, a first connecting member 263, and a second connecting member 264.

[0091] 13, the actuator 261 is fixed to the lower side frame 221a above the lower side frame 221a. An elevation rod 261a is attached to the tip of the actuator 261. The elevation rod 261a is driven by the actuator 261 to move up and down.

[0092] The tip of the lifting rod 261a is connected to a link member 262 via a first connecting member 263. The first connecting member 263 is guided by a long hole 228 formed in the side surface of the lower side frame 221a, and moves up and down together with the lifting rod 261a and the link member 262. The link member 262 has an elongated shape and extends vertically. The link member 262 is connected to the lifting rod 261a so as to be rotatable about the first connecting member 263 on the lower side. And the link member 262 is rotatably connected to the connecting frame 221b via the second connecting member 264 on the upper side.

[0093] Regarding the operation of the drive mechanism 260 configured as described above, when the seated person executes the mid-fold adjustment operation, the actuator 261 is driven. When the actuator 261 is driven, the lifting rod 261a and the first connecting member 263 are guided by the long hole 228 and rise. At this time, the link member 262 tilts backward about the first connecting member 263 and pushes the second connecting member 264 upward. As a result, the connecting frame 221b rotatably connected to the second connecting member 264 rotates about the mid-fold axis 227 with respect to the lower side frame 221a.

[0094] <<Regarding the functional configuration of the ECU 250>> Next, the ECU 250 will be described. FIG. 14 shows the functional configuration of the ECU 250. The ECU 250 includes an acquisition unit 251, a determination unit 252, and a drive unit 253.

[0095] The acquisition unit 251 acquires the detection values of the weight sensor 40, the vehicle speed sensor 41, the steering angle sensor 42, the pressure sensor 43, the inflation pressure sensor 44, the rotation angle sensor 245, and the mid-fold angle sensor 246. The rotation angle sensor 245 can detect the rotation angle of the seat back frame 220 with respect to the seat cushion frame 210. The mid-fold angle sensor 246 can detect the mid-fold angle of the connecting frame 221b with respect to the lower side frame 221a. The rotation angle output by the rotation angle sensor 245 corresponds to the first rotation angle signal, and the mid-fold angle detected by the mid-fold angle sensor 246 corresponds to the second rotation angle signal.

[0096] The determination unit 252 determines the state of the seatback frame 220 from the rotation angles detected by the rotation angle sensor 245 and the center-bending angle sensor 246. More specifically, the determination unit 252 determines whether the seatback frame 220 is in a "normal state" or a "reclining state."

[0097] The normal state is, for example, a state in which the seat back frame 220 is substantially upright relative to the seat cushion frame 210, and the connecting frame 221b is not bent in the middle relative to the lower side frame 221a. On the other hand, the reclined state is a state in which the seat back frame 220 tilts rearward relative to the seat cushion frame 210, and the connecting frame 221b rotates relative to the lower side frame 221a, resulting in a folded state.

[0098] The determination unit 252 has a determination condition table that defines determination conditions for determining whether a combination of detection values ​​from the rotation angle sensor 245 and the center-bending angle sensor 246 corresponds to a normal state or a reclining state. The determination unit 252 then compares the detection value acquired by the acquisition unit 251 with the determination conditions defined in the determination condition table to determine whether the seatback frame 220 is in the "normal state" or the "reclining state."

[0099] The drive unit 253 controls the expansion and contraction of the shoulder fluid bladders 32 and the lumbar fluid bladders 37 based on the determination result of the determination unit 252. When the drive unit 253 determines that the seatback frame 220 is in a reclined state, it inflates the shoulder fluid bladders 232 and the lumbar fluid bladders 237, causing the shoulder supports 230 and the lumbar supports 235 to bear the weight of the seated occupant. In this way, the vehicle seat of this embodiment can further improve the comfort of the seated occupant when seated and relaxed in a vehicle seat in a reclined state. Furthermore, by providing the shoulder fluid bladders 232 and the lumbar fluid bladders 237 on the seatback frame 220 in which the connecting frame 221b and the vertical portion 222a are folded in half, more precise posture support adjustment can be performed.

[0100] <Third embodiment> A vehicle seat according to the third embodiment will be described below with reference to Figures 15 to 17. The vehicle seat according to the third embodiment has shoulder supports 330 and lumbar supports 335 whose positions in the vertical direction can be adjusted. The shoulder supports 330 are controlled by an ECU 350 so as to move up and down in conjunction with each other in accordance with the position of the lumbar support 335. An inflatable and deflate shoulder fluid bladder 332 is attached to the shoulder supports 330.

[0101] <<Seatback frame configuration>> 15 is a perspective view of a seat back frame 320 of a vehicle seat according to the third embodiment. The seat back frame 320 is a substantially rectangular frame-shaped body, and is rotatable relative to the seat cushion frame.

[0102] As shown in FIG. 16, the seat back frame 320 is mainly composed of left and right back side frames 321, an upper frame 322, a lower frame 323, and a support device 360 ​​having a lifting function.

[0103] The back side frames 321 are arranged one on each side of the seat back frame 320. The back side frames 321 extend in the up-down direction. The upper ends of the left and right back side frames 321 are connected to each other via an upper frame 322 .

[0104] A lower frame 323 is installed at the lower ends of the left and right back side frames 321 to connect the left and right back side frames 321 together. Two mounting holes 323a spaced apart from each other are formed in the center in the left-right direction of the lower frame 323. The mounting holes 323a penetrate the lower frame 323 in the front-rear direction. Fasteners such as screws are inserted through the mounting holes 323a to fix a lower connecting member (not shown) of the support device 360, which will be described later, to the lower frame 323.

[0105] The seat back frame 320 further includes a horizontal connecting frame 324 that connects the upper portions of the left and right back side frames 321 together. The horizontal connecting frame 324 has a lower flange 324a that extends forward at its lower edge. Support holes 324b are formed on both left-right ends of the lower flange 324a. The support holes 324b penetrate in the up-down direction. A support wire 363 of a support device 360, which will be described later, is inserted through the support hole 324b. The support wire 363 is fixed in a suspended state on the horizontal connecting frame 324.

[0106] Support device 360 ​​receives the load generated when the seated occupant leans against the seat back. Support device 360 ​​has a lifting mechanism 370, which can raise and lower shoulder supports 330 and lumbar supports 335 that support the shoulders and lower back of the seated occupant, thereby supporting appropriate areas according to the body shape of the seated occupant. The support device 360 ​​mainly comprises a pressure-receiving member 361 and a support member 362 .

[0107] The pressure-receiving member 361 is a flexible plate-shaped member made of a resin material. The pressure-receiving member 361 extends vertically and can receive the load from the back and waist of the seated occupant. The pressure-receiving member 361 has a central portion 361a located in the center in the left-right direction and side portions 361b extending from the central portion 361a to both sides in the left-right direction. A plurality of openings are formed in the central portion 361a and the side portions 361b. The side portions 361b have a plurality of protrusions. This allows the pressure-receiving member 361 to ensure the flexibility necessary to bear the load from the back and waist of the seated person. In other words, when the seated person sits, the pressure-receiving member 361 can deform in the up-down and left-right directions to support the back and waist of the seated person in a manner that envelops them.

[0108] Left and right mounting hooks 361c are formed on the upper end of the pressure-receiving member 361. The mounting hooks 361c are hooked onto latched portions 364d of the support member 362, which will be described later.

[0109] The support member 362 supports the pressure-receiving member 361 from behind the pressure-receiving member 361 . 17, the support member 362 mainly comprises a support wire 363, an upper fixed plate 364, a guide wire 365, a lower fixed plate 366, a first movable plate 367, a second movable plate 368, a third movable plate 369, and an elevating mechanism 370. A shoulder support 330 is attached to the first movable plate 367. A lumbar support 335 is attached between the second movable plate 368 and the third movable plate 369.

[0110] The support wires 363 are a pair of left and right wires that are fixed to the horizontal connecting frame 324 and suspend the support members 362. The upper ends of the support wires 363 are inserted into left and right support holes 324b formed in the horizontal connecting frame 324 of the seat back frame 320 and fixed to the horizontal connecting frame 324. The lower ends of the support wires 363 are connected to horizontal support pipes 364b arranged above the upper fixing plate 364.

[0111] The upper fixing plate 364 is located in the upper portion of the support member 362. The upper fixing plate 364 has an upper fixing plate main body 364a, a horizontal support pipe 364b, and left and right vertical support pipes 364c. The upper fixing plate body 364a is a plate-like body having an elongated shape extending in the left-right direction. A first upper fixing member 374a of the lifting mechanism 370, which will be described later, is fixed to the upper fixing plate body 364a. In addition, a pair of latching portions 364d (see FIG. 16) are formed on the left and right sides of the first upper fixing member 374a on the upper fixing plate body 364a, and mounting hooks 361c of the pressure-receiving member 361 can be latched onto them.

[0112] The horizontal support pipe 364b extends in the left-right direction along the upper edge of the upper fixing plate main body 364a. The horizontal support pipe 364b is a round pipe-like body. Support wires 363 are fixed to both left-right ends of the horizontal support pipe 364b. The left and right vertical support pipes 364c extend in the up-down direction from both left and right end portions of the upper fixing plate main body 365a. The vertical support pipes 364c are hollow, round pipe-like bodies. The upper end portion of a guide wire 365 (described later) is inserted and fixed inside the vertical support pipes 364c.

[0113] The guide wires 365 are wires that extend in the vertical direction, and two of them are arranged parallel to each other and spaced apart from each other on the left and right. The guide wires 365 guide the vertical movements of a first movable plate 367, a second movable plate 368, and a third movable plate 369, which will be described later. The lower ends of the guide wires 365 are fixed to the left and right ends of a lower fixed plate 366.

[0114] The lower fixed plate 366 is located below the support member 362. The lower fixed plate 366 is a long plate-like body that extends in the left-right direction. Protrusions 366a are provided at positions spaced apart on the left and right sides on the rear surface of the lower fixing plate 366. The protrusions 366a come into contact with the front surface of the lower frame 323 when the support member 362 is assembled to the seat back frame 320.

[0115] A through hole 366b is formed on the inside of the protrusion 366a of the lower fixing plate 366 in the left-right direction, for attaching a lower connecting member (not shown) that connects the support member 362 to the lower frame 323. The lower connecting member is fixed to a mounting hole 323a formed in the lower frame 323 using a fastening member such as a screw.

[0116] The first movable plate 367, the second movable plate 368, and the third movable plate 369 are plate-like bodies that can be raised and lowered by a lifting mechanism 370, which will be described later. The first movable plate 367 is positioned higher than the second movable plate 368 and the third movable plate 369. Guided portions 367a extending up and down are formed on both left and right sides of the first movable plate 367. The left and right guided portions 367a have grooves that are slidable along the left and right guide wires 365 extending parallel to the up and down direction.

[0117] Shoulder supports 330 are fixed to both left and right ends of the first movable plate 367. As in the above-described embodiment, shoulder fluid bladders 332 (see FIG. 15) are attached to the shoulder supports 330. The shoulder fluid bladders 332 can be expanded or contracted by injecting or discharging fluid into or from the shoulder fluid bladders 332. As will be described later, the shoulder supports 330 move up and down in conjunction with the lumbar support 335. This makes it possible to support both shoulders of the seated occupant at positions appropriate for their body shape, thereby improving support for the seated occupant.

[0118] The second movable plate 368 is located below the first movable plate 367 and above the third movable plate 369. Guided portions 368a extending vertically are formed on both left-right ends of the second movable plate 368. The left and right guided portions 368a have grooves that allow sliding along the left and right guide wires 365 extending vertically.

[0119] The third movable plate 369 is positioned lower than the first movable plate 367 and the second movable plate 368. Guided portions 369a extending vertically are formed on both left-right ends of the third movable plate 369. The left and right guided portions 369a have grooves that allow sliding along the left and right guide wires 365 extending vertically.

[0120] The lumbar support 335 is a strip-shaped member located between the second movable plate 368 and the third movable plate 369, spanning both the left and right sides. The lumbar support 335 extends in the vertical direction. The upper end of the lumbar support 335 is fixed to the second movable plate 368. The lower end of the lumbar support 335 is fixed to the third movable plate 369.

[0121] Lumbar support 335 deforms based on the relative positions of second movable plate 368 and third movable plate 369. More specifically, when second movable plate 368 and third movable plate 369 are displaced from a position where they are spaced apart to a position where they are close to each other, lumbar support 335 bends forward and bulges out. This makes it possible to support the lumbar region of the seated occupant at an appropriate position according to the body shape of the seated occupant, thereby improving support for the seated occupant.

[0122] The lifting mechanism 370 drives the first movable plate 367, the second movable plate 368, and the third movable plate 369 so as to change their positions in the up and down direction. The lifting mechanism 370 has a screw shaft 371, a motor 372, a transmission member 373, and a fixed member 374.

[0123] The screw shaft 371 is a rod-shaped body having a male screw formed on its outer circumferential surface, and extends in the vertical direction. The screw shaft 371 has a first screw shaft 371a, a second screw shaft 371b, and a third screw shaft 371c. The first screw shaft 371a transmits the driving force of the first motor 372a to the third movable plate 369, thereby displacing the third movable plate 369 in the up and down direction. The upper end of the first screw shaft 371a is fixed to the upper fixing plate 364 by a first upper fixing member 374a. The lower end of the first screw shaft 371a is fixed to the lower fixing plate 366 by a first lower fixing member 374b.

[0124] The second screw shaft 371b displaces the second movable plate 368 relative to the third movable plate 369 by transmitting the driving force of the second motor 372b to the second movable plate 368. The upper end of the second screw shaft 371b is fixed to the second movable plate 368 by a second upper fixing member 374c. The lower end of the second screw shaft 371b is not fixed.

[0125] The third screw shaft 371c transmits the driving force of the third motor 372c to the first movable plate 367, thereby displacing the first movable plate 367 relative to the third movable plate 369. The upper end of the third screw shaft 371c is fixed to the first movable plate 367 by a third upper fixing member 374d. The lower end of the third screw shaft 371c is not fixed.

[0126] The motor 372 is an electric motor that converts electrical energy into rotational energy. The motor 372 includes a first motor 372 a, a second motor 372 b, and a third motor 372 c. The first motor 372 a, the second motor 372 b, and the third motor 372 c are fixed to the third movable plate 369. The transmission member 373 is engaged with the output shaft of the motor 372 to transmit the rotational energy of the motor 372 to the screw shaft 371. The transmission member 373 has a first transmission member 373a, a second transmission member 373b, and a third transmission member 373c. The first transmission member 373a, the second transmission member 373b, and the third transmission member 373c are fixed to the third movable plate 369. The transmission member 373 is movable up and down relative to the screw shaft 371.

[0127] The first motor 372a and the first transmission member 373a drive the third movable plate 369 to displace it in the up and down direction. The first motor 372a and the first transmission member 373a displace together with the third movable plate 369 in the up and down direction relative to the support device 360.

[0128] The second motor 372b and the second transmission member 373b drive the second movable plate 368 to vertically displace the second movable plate 368. The second movable plate 368 is displaced vertically relative to the third movable plate 369 together with the second screw shaft 371b.

[0129] The third motor 372c and the third transmission member 373c drive the first movable plate 367 to vertically displace the first movable plate 367. The first movable plate 367 is displaced vertically relative to the third movable plate 369 together with the third screw shaft 371c.

[0130] The operation of the support device 360 ​​configured as described above will be described. When the seated person performs an operation to raise or lower the shoulder support 330 and the lumbar support 335, the first motor 372a is driven. The driving force of the first motor 372a is transmitted to the first screw shaft 371a via the first transmission member 373a, and the third movable plate 369 is raised or lowered in the vertical direction. At this time, the first movable plate 367 and the second movable plate 368 also rise or lower in the vertical direction in conjunction with the third movable plate 369.

[0131] When the second motor 372b is driven, the driving force of the second motor 372b is transmitted to the second screw shaft 371b via the second transmission member 373b, causing the second movable plate 368 to move up and down relative to the third movable plate 369. When the distance between the second movable plate 368 and the third movable plate 369 becomes smaller, the lumbar support 335 deforms and bulges forward, thereby making it possible to properly support the lower back of the seated occupant.

[0132] The third motor 372c drives the shoulder support 330 to move up and down in conjunction with the vertical position of the lumbar support 335. The driving force of the third motor 372c is transmitted to the third screw shaft 371c via the third transmission member 373c. As a result, the first movable plate 367 to which the shoulder support 330 is attached moves up and down relative to the third movable plate 369. In this way, by linking the vertical position of the shoulder support 330 with the position of the lumbar support 335, the shoulder support 330 and the lumbar support 335 can be positioned appropriately according to the body shape of the seated person. This makes it possible to improve the comfort of the seated person.

[0133] Furthermore, the ECU 350 according to the third embodiment may control the expansion and contraction of the shoulder fluid bladder 332 attached to the shoulder support 330 based on the road surface conditions, the steering angle of the steering wheel, the driving mode, and the rotation angle of the seat back. This makes it possible to support the seated occupant appropriately according to the body shape of the seated occupant and the driving conditions.

[0134] Although the lumbar support 335 has been described as being a band-shaped body positioned between the second movable plate 368 and the third movable plate 369 and spanning both the left and right sides, the present invention is not limited to this. The lumbar support 335 may be a lumbar fluid bag disposed on either the second movable plate 368 or the third movable plate 369. In this case, the lumbar support 335 can be controlled so as to expand and contract by the fluid supplied to the lumbar fluid bag.

[0135] <Fourth embodiment> A vehicle seat S401 according to a fourth embodiment will be described below with reference to FIGS. 18 to 20. The vehicle seat S401 has a shoulder support 430 and a side support 460 on both sides in the seat width direction. The shoulder support 430 incorporates multiple shoulder fluid bladders. Similarly, the side support 460 incorporates multiple side fluid bladders 462. The shoulder fluid bladders and the side fluid bladders 462 expand when compressed air is injected into them and contract when the compressed air is discharged. The multiple shoulder fluid bladders and the multiple side fluid bladders 462 have different sizes and are arranged in different directions, so that they bulge and protrude in different directions. This allows the torso of the seated occupant to be supported laterally in an appropriate and flexible manner according to the body shape of the seated occupant, thereby improving support for the seated occupant and increasing their sense of security.

[0136] <<Basic structure of a vehicle seat>> Fig. 18 is a perspective view showing the basic configuration of a vehicle seat S401 according to the fourth embodiment. As shown in Fig. 18, the vehicle seat S401 mainly includes a seat cushion S411, a seat back S412, and a headrest S413. The seat back S412 incorporates a seat back frame 420 (see FIG. 19), and left and right shoulder supports 430, a lumbar support 435, and side supports 460, which are respectively arranged inside a cover material S412b (see FIG. 20).

[0137] Fig. 19 is a front view of a seat back frame 420 that forms the framework of the vehicle seat S401. As shown in Fig. 19, the seat back frame 420 is a substantially rectangular frame-like body. The seatback frame 420 is mainly composed of left and right backside frames 421, an upper frame 422, and a lower frame 423. A pressure-receiving member 424 is disposed between the seatback frame 420 and a seatback pad (not shown). The pressure-receiving member 424 is a resin plate-like body that receives pressure applied from the back and waist of the seated occupant.

[0138] The pressure-receiving member 424 has an upper portion 424a located at the top, a central portion 424b that is wider than the upper portion 424a, and a lower portion 424c that extends downward. The upper portion 424a, the central portion 424b, and the lower portion 424c are integrally molded to form a single pressure-receiving member 424.

[0139] Shoulder fluid bags 432 that constitute the shoulder supports 430 are fixed to both left and right sides of the front side of the upper portion 424a. By using the pressure-receiving member 424 as a fixing member for the shoulder fluid bags 432 in this way, the number of parts can be reduced compared to when separate support members are provided, and the configuration of the seatback frame 420 can be simplified.

[0140] The central portion 424b is disposed at a position sandwiched between the backside frames 421. The portions of the central portion 424b located on both ends in the seat width direction are bent and protrude slightly forward relative to the portion located in the center in the seat width direction.

[0141] The lower portion 424c is slightly narrower than the upper portion 424a, and its lower end extends downward to the vicinity of the lower frame 423. A lumbar fluid bag 437 that constitutes lumbar support 435 is attached at a position spanning central portion 424b and lower portion 424c. By using pressure-receiving member 424 as a fixing member for lumbar fluid bag 437 in this way, the number of parts can be reduced compared to when a separate support member is provided, and the configuration of seatback frame 420 can be simplified.

[0142] The pressure-receiving member 424 configured as described above is attached to the seat back frame 420 by an elastic support wire 425. The pressure-receiving member 424 fixed to the seat back frame 420 by the support wire 425 is flexible and can receive the load from the back and waist of the seated occupant.

[0143] Further, a side fluid bag 462 constituting a side support 460 is attached to the back side frame 421 located outside the lower portion 424c of the pressure receiving member 424 in the left-right direction.

[0144] Figure 20 shows a cross-sectional view taken along line CC of Figure 19. As shown in Figure 20, three side fluid bags 462 are attached to the side support 460 in a stacked state. Each side fluid bag 462 expands when compressed air is injected into it, and contracts when the compressed air is discharged. The side fluid bags 462 are stacked when contracted. Each of the side fluid bags 462 has a different size. Furthermore, each of the side fluid bags 462 is arranged in a different direction, and when compressed air is injected into them, they expand and protrude in different directions. This allows the side support 460 to deform into an appropriate and flexible shape according to the body shape of the seated person, and to support the torso of the seated person from the side. This makes it possible to improve the support for the seated person and increase their sense of security. The side fluid bag 462 corresponds to the movable body and also corresponds to the third movable body.

[0145] Furthermore, the ECU 450 according to the fourth embodiment may control the expansion and contraction of the shoulder fluid bladders 432, the lumbar fluid bladders 37, and the side fluid bladders 462 based on road conditions, the steering angle of the steering wheel, the driving mode, and the rotation angle of the back seat. This makes it possible to appropriately support the seated occupant according to the body shape of the seated occupant and the driving state of the vehicle.

[0146] Fifth Embodiment A vehicle seat according to the fifth embodiment will be described below with reference to Figures 21 and 22. In the above-described embodiments, the shoulder fluid bladder 32 and the lumbar fluid bladder 37 are provided on the seatback frame. In contrast, the vehicle seat according to the fifth embodiment has a thigh fluid bladder 540 provided on the seat cushion frame 510. The ECU of the vehicle seat according to the fifth embodiment controls the thigh fluid bladder 540 to expand and contract. This allows the occupant to maintain the same posture for a long period of time without interfering with pedal operation, thereby preventing thrombosis (economy class syndrome) caused by poor blood flow.

[0147] <<Basic structure of seat cushion frame>> 21 is a perspective view of a seat cushion frame 510 according to the fifth embodiment. The seat cushion frame 510 serves as a framework for a seat cushion (not shown). The seat cushion frame 510 is covered with a seat cushion pad (not shown) and a covering material (not shown).

[0148] As shown in FIGS. 21 and 22, the seat cushion frame 510 has, as its main components, cushion side frames 511 as side frames, a pan frame 512, a front pipe 513, and a rear pipe 514.

[0149] The cushion side frames 511 are arranged one on each side of the seat cushion frame 510. The cushion side frames 511 are plate-shaped bodies extending in the front-rear direction.

[0150] The pan frame 512 is interposed between the front ends of the left and right cushion side frames 511 and connects the left and right cushion side frames 511. The pan frame 512 is a plate-like body that extends in the left-right direction. Left and right thigh fluid bladders 540 are attached to the upper surface of pan frame 512. Thigh fluid bladders 540 expand and contract by controlling the supply of compressed air, which can stimulate the backs of the thighs of the seated person and prevent a deterioration in blood flow in the lower legs.

[0151] The front pipe 513 is located rearward of the pan frame 512 and connects the left and right cushion side frames 511 together. The rear pipe 514 is interposed between the rear ends of the left and right cushion side frames 511 and connects the left and right cushion side frames 511 together.

[0152] The seat cushion frame 510 has a pressure-receiving member 520 and left and right support members 530 . The pressure receiving member 520 is a member that receives the weight of the seated occupant via the pad S2b. The pressure receiving member 520 is disposed between the left and right cushion side frames 511. The pressure receiving member 520 has three wires 521 that are stretched between the front pipe 513 and the rear pipe 514, and a front pressure receiving plate 522, a central pressure receiving plate 523, and a rear pressure receiving plate 524 that connect the wires 521. The front pressure receiving plate 522, the central pressure receiving plate 523, and the rear pressure receiving plate 524 are made of flexible resin, but are not limited to this. The front pressure receiving plate 522, the central pressure receiving plate 523, and the rear pressure receiving plate 524 may also be made of elastic members such as rubber.

[0153] The wire 521 is laid across both left and right ends and the center between the front pipe 513 and the rear pipe 514. The wire 521 supports a front pressure receiving plate 522, a center pressure receiving plate 523, and a rear pressure receiving plate 524.

[0154] The front pressure plate 522 is located forward of the central pressure plate 523 and the rear pressure plate 524. The front pressure plate 522 is supported by the wire 521 via supported portions (not shown) formed on the underside. The supported portions are formed at both ends in the left-right direction and in the center. The front pressure plate 522 is a plate-like body that supports the thighs of a seated occupant and has flexibility that allows it to deform when it receives the load from the thighs.

[0155] The central pressure plate 523 is located rearward at a predetermined distance from the front pressure plate 522 and forward of the rear pressure plate 524. The central pressure plate 523 is supported by the wire 521 via supported portions formed on its underside. The supported portions are formed at both ends in the left-right direction and in the center. The central pressure plate 523 is disposed approximately parallel to the horizontal plane. The central pressure plate 523 is a plate-like body that supports the thighs and buttocks of a seated person. The central pressure plate 523 has flexibility that allows it to deform when it receives the load from the thighs and buttocks.

[0156] The central pressure plate 523 has through holes 523b formed at positions corresponding to the seat bones of the seated occupant. The left and right through holes 523b are aligned at intervals in the left-right direction. The through holes 523b prevent the load from being concentrated on the seat bones of the seated occupant. In other words, by forming the through holes 523b below the seat bones of the seated occupant, the load from the seat bones can be dispersed around the through holes 523b. This improves the comfort of the seated occupant when seated for long periods of time.

[0157] Four slits 523c extending laterally are formed at the edge of through-hole 523b. By forming slits 523c at the edge of through-hole 523b, central pressure plate 523 can deform to follow the shape of the seated occupant's buttocks while ensuring the strength necessary to withstand the load from the seated occupant's thighs. This makes it possible to improve support for the seated occupant.

[0158] The rear pressure plate 524 is located rearward at a predetermined distance from the front pressure plate 522 and the central pressure plate 523. The rear pressure plate 524 is supported by the wire 521 via supported portions (not shown) formed on the underside. The supported portions are formed at both ends in the left-right direction and in the center. The rear pressure plate 524 is a plate-like body that supports the buttocks of a seated person. The rear pressure plate 524 has flexibility that allows it to deform when it receives the load from the buttocks.

[0159] The rear pressure plate 524 has a plate-shaped main body portion 524b, an inclined portion 524c extending from the rear end of the main body portion 524b, and a plurality of ribs 524d arranged side by side in the left-right direction between the main body portion 524b and the inclined portion 524c.

[0160] A through-hole 524e is formed in the main body 524b at a position corresponding to the tailbone of the seated person. The through-hole 524e is formed in the center of the main body 524b in the left-right direction. The through-hole 524e is approximately triangular, with dimensions and a shape corresponding to the orientation and shape of the tailbone when the seated person is seated. The through-hole 524e prevents the load from the seated person's tailbone from being concentrated. In other words, by forming the through-hole 524e below the seated person's tailbone, the load from the tailbone can be dispersed around the through-hole 524e. This improves the comfort of the seated person when sitting for long periods of time.

[0161] The inclined portion 524c extends obliquely upward from the rear end of the main body portion 524b. The inclined portion 524c is formed over the entire length in the left-right direction of the rear pressure-receiving plate 254. The inclined portion 524c makes it possible to more effectively support the buttocks of a seated occupant.

[0162] The ribs 524d are multiple plate-like bodies that protrude upward from between the main body portion 524b and the inclined portion 524c. The upper surfaces of the ribs 524d have curved surfaces that smoothly connect the front surfaces of the inclined portions 524c and the upper surface of the main body portion 524b.

[0163] As described above, the front pressure plate 522, the central pressure plate 523, and the rear pressure plate 524 are arranged at a predetermined distance from one another in the front-to-rear direction. This allows the pressure receiving member 520 to deform with sufficient flexibility and receive the weight of the seated person, even when a large load is applied when the person sits down. Furthermore, even when a large load is applied when the person sits down, the front pressure plate 522, the central pressure plate 523, and the rear pressure plate 524 are prevented from interfering with each other.

[0164] The support members 530, disposed on both sides in the seat width direction, are members that support the seated occupant from both the left and right sides. The support members 530 have a first portion 531, a second portion 532, a third portion 533, a fourth portion 534, and a connecting portion 535. The first portion 531, the second portion 532, the third portion 533, and the fourth portion 534 are integrally formed.

[0165] The first portion 531 is a portion that covers the inside of the rear end portion of the cushion side frame 511. The first portion 531 has an abutment portion that abuts against a rear pipe 514 that connects the rear ends of the left and right cushion side frames 511.

[0166] The second portion 532 is connected to the front side of the first portion 531. The second portion 532 is a portion that covers the upper portion of a flange formed on the upper edge of the cushion side frame 511. The second portion 532 has a plate shape. The second portion 532 is connected to the cushion side frame 511 by bolts, resin claws, clips, etc.

[0167] The third portion 533 is connected to the front side of the first portion 531. The third portion 533 is also connected to the inside of the second portion 532. The third portion 533 is a plate-like body that extends diagonally downward from the inside of the second portion 532 to form a side wall. The third portion 533 is a portion that supports both sides of the area from the buttocks to the thighs of a seated person.

[0168] The fourth portion 534 is connected to the lower end side of the third portion 533. The fourth portion 534 is a plate-like body that extends diagonally inward and downward in the left-right direction from the lower end of the third portion 533, forming an inclined wall. The fourth portion 534, together with the third portion 533, is a portion that supports both sides of the region from the buttocks to the thighs of a seated person.

[0169] The connecting portions 535 are connecting members that are arranged at three positions in the front-rear direction and can engage with the wire 521. The two connecting portions 535 located in the front support the central pressure plate 523 via the wire 521. The connecting portion 535 located in the rear supports the rear pressure plate 524 via the wire 521. The connecting portions 535 are attached to the lower end of the fourth portion 534. The connecting portions 535 engage with the wire 521 to support the wire 521 outward in the left-right direction and upward.

[0170] Next, we will explain the left and right thigh fluid bladders 540 arranged on the front side of the seat cushion frame 510, more specifically, on the upper surface of the pan frame 512. Thigh fluid bladders 540 are arranged in positions corresponding to the backs of the knees or the backs of the thighs of the seated occupant when seated.

[0171] The ECU 550 according to the fifth embodiment controls the supply of fluid to the left and right thigh fluid bladders 540 and the discharge of fluid. This prevents the left and right thigh fluid bladders 540 from contracting, stimulating the thighs of the seated occupant. This improves the blood flow of an occupant who maintains the same posture for a long period of time, thereby preventing the occurrence of economy class syndrome. The ECU 550 may also determine, based on the detection value of the weight sensor 40 described above, that the seated occupant has maintained the same posture for a long period of time, and control the thigh fluid bladders 540 to prevent contraction based on the determination result. This makes it possible to more effectively prevent the occurrence of economy class syndrome.

[0172] Furthermore, ECU 550 may control left and right thigh fluid bladders 540 to alternately contract at predetermined time intervals. This makes it possible to encourage the seated occupant to perform a "thigh-raising exercise" by lifting their thighs when thigh fluid bladders 540 are inflated and lowering their thighs when thigh fluid bladders 540 are deflated. This makes it possible to more effectively prevent the occurrence of economy class syndrome.

[0173] Furthermore, ECU 550 may limit the volume of fluid injected into thigh fluid bladder 540 based on the detection values ​​of pressure sensor 43 and inflation pressure sensor 44. This makes it possible to prevent thigh fluid bladder 540 from being excessively inflated, thereby preventing the seated occupant from being unable to operate the accelerator, brake, or other driving pedals.

[0174] Furthermore, ECU 550 may control the volume of fluid injected into thigh fluid bladder 540 based on the detection values ​​of vehicle speed sensor 41, steering angle sensor 42, and rotation angle sensor 45. This allows appropriate inflation / deflation control to be performed according to the driving state of the vehicle, making it possible to support the occupant in driving for long periods of time and reduce fatigue.

[0175] Furthermore, ECU 550 may control the volume of fluid injected into thigh fluid bladder 540 based on the driving mode of the vehicle. For example, in an autonomous driving mode in which the seated person does not need to operate the driving pedals, thigh fluid bladder 540 is controlled to expand, thereby reducing fatigue of the seated person. When the autonomous driving mode is cancelled, thigh fluid bladder 540 is controlled to contract, thereby preventing the occurrence of a situation in which the seated person is unable to operate the pedals.

[0176] Sixth Embodiment A vehicle seat according to the sixth embodiment will be described below with reference to Fig. 23. In the fifth embodiment described above, thigh fluid bladders 540 were described as being disposed on the front side of seat cushion frame 510 (on the upper surface of pan frame 512). In contrast, in the vehicle seat according to the sixth embodiment, thigh fluid bladders 640 are disposed on both left and right sides of seat cushion frame 610, rearward of the center in the fore-and-aft direction. This makes it possible to appropriately support the buttocks and thighs of the seated occupant from the sides in accordance with the body shape of the seated occupant.

[0177] 23 is a top view of the seat cushion frame 610. The seat cushion frame 610 serves as a framework for the seat cushion (not shown). The seat cushion frame 610 is covered with a seat cushion pad (not shown) and a covering material (not shown).

[0178] The seat cushion frame 610 has cushion side frames 511 as side frames, a pan frame 512, a front pipe 513, and a rear pipe 514. The seat cushion frame 610 also has a pressure-receiving member 520 and a support member 530 between the left and right cushion side frames 511. The basic configuration of the seat cushion frame 610 is the same as that of the fifth embodiment described above, and therefore a detailed description thereof will be omitted.

[0179] 23, in the vehicle seat according to the sixth embodiment, thigh fluid bladders 640 are disposed in positions different from those in the fifth embodiment. More specifically, thigh fluid bladders 640 are disposed rearward of the center in the front-rear direction of seat cushion frame 610, on both left-right sides. Thigh fluid bladders 640 are attached to the upper surfaces of fourth portions 534, inside third portions 533 of support members 530 disposed on the left and right sides.

[0180] ECU 650 controls the supply or discharge of fluid to and from left and right thigh fluid bladders 640. As a result, left and right thigh fluid bladders 640 contract (expand or contract), supporting the buttocks and thighs of the seated occupant from below and laterally. In other words, by controlling the amount of compressed air supplied to thigh fluid bladders 640, the support force of the sides of pressure-receiving member 520 can be adjusted. Therefore, it is possible to effectively support the buttocks and thighs of seated occupants of different body shapes from below and laterally, thereby improving support for the seated occupant.

[0181] Furthermore, ECU 650 may control the volume of fluid injected into thigh fluid bladder 640 based on the detection values ​​of vehicle speed sensor 41, steering angle sensor 42, and rotation angle sensor 45. This allows for appropriate inflation / deflation control according to the body shape of the seated person and the driving state of the vehicle, making it possible to support the seated person in driving for long periods of time and reduce fatigue.

[0182] Seventh Embodiment A vehicle seat according to the seventh embodiment will be described below with reference to FIG. 24. In the sixth embodiment described above, thigh fluid bladders 640 are attached to the upper surfaces of support members 530 disposed on the left and right sides of seat cushion frame 610. In contrast, the vehicle seat according to the seventh embodiment has biasing members 740 disposed below support members 530 that bias support members 530 upward. In this case as well, the support force of the sides of pressure-receiving member 520 can be adjusted by biasing members 740. Furthermore, it becomes possible to appropriately support the buttocks and thighs of the seated occupant from the sides in accordance with the body shape of the seated occupant.

[0183] FIG. 24 shows a top view of a seat cushion frame 710 according to the seventh embodiment. As shown in FIG. 24, biasing members 740 are disposed on both left and right sides of the seat cushion frame 710, rearward of the center in the front-rear direction. The biasing members 740 are disposed below fourth portions 534 of support members 530 disposed on the left and right sides. More specifically, the vehicle seat according to the seventh embodiment includes a pair of left and right cushion side frames 511 and a pressure-receiving member 520 disposed between the cushion side frames 511. The vehicle seat further includes support members 530 provided on both left and right sides of the pressure-receiving member 520, and biasing members 740 that bias the support members 530 upward.

[0184] Support member 530 is a resin member that has flexibility that allows it to be deformed by biasing member 740 located below it. Biasing member 740 is an elastic member such as a spring. Above biasing member 740, support member 530, a seat cushion pad (not shown), and a cover material (not shown) are arranged.

[0185] 25 is a diagram schematically illustrating a state in which biasing member 740 biases support member 530 upward. As shown in FIG. 25, biasing member 740 is an elastic member made up of torsion spring 741 disposed below support member 530. Torsion spring 741 biases fourth portion 534 of support member 530 upward. This makes it possible to appropriately support the buttocks and thighs of the seated occupant from the sides in accordance with the body shape of the seated occupant.

[0186] 26 , the biasing member 740 may include a support plate 742 fixed below the support member 730 and a thigh fluid bladder 743 attached to the upper surface of the support plate 742. The ECU 750 according to the seventh embodiment supplies fluid to the left and right thigh fluid bladders 743 and controls the thigh fluid bladders 743 to expand, thereby causing the thigh fluid bladders 743 to function as the biasing member 740. In other words, by supplying a predetermined amount of fluid to the thigh fluid bladders 743, the fourth portion 534 of the support member 530 is biased upward. This makes it possible to appropriately support the buttocks and thighs of the seated occupant from the sides in accordance with the body shape of the seated occupant.

[0187] 27, the biasing member 740 has a support plate 742 fixed so as to extend in the left-right direction, and left and right elastic rotors 744 each having a cam shape and attached to the upper surface of the support plate 742. The elastic rotors 744 are elastic members made of a rubber material.

[0188] The ECU 750 according to the seventh embodiment can rotate the left and right elastic rotors 744 using a motor (not shown), thereby causing the elastic rotors 744 to function as the biasing members 740. In other words, by rotating the elastic rotors 744, the protruding portions 744a of the elastic rotors 744 can bias the support member 530 upward. This makes it possible to appropriately support the buttocks and thighs of the seated person from the sides in accordance with the body shape of the seated person.

[0189] <<Modifications>> In the fifth to seventh embodiments described above, the number of wires 521 supporting the pressure-receiving member 520 is three, but the present invention is not limited to this. For example, the number of wires 521 may be two, or four or more. Moreover, although the front end of the wire 521 has been described as being hung over the front pipe 513, the present invention is not limited to this. The wire 521 may also be hung over the pan frame 512.

[0190] Eighth Embodiment A vehicle seat according to the eighth embodiment will be described below with reference to FIGS. 28 to 30. In the above-described fifth to seventh embodiments, the pressure-receiving member 520 has been described as being attached to a predetermined position. In contrast, the seat cushion frame 810 according to the eighth embodiment has a length adjustment mechanism 820 that can adjust the length in the front-rear direction, and the pressure-receiving member 520 is configured to be movable in the front-rear direction in conjunction with the length adjustment mechanism 820. This allows the pressure-receiving member 520 to be disposed in an appropriate position that matches the physique of the seated occupant. Therefore, it becomes possible to support the weight of the seated occupant appropriately according to the physique of the seated occupant.

[0191] <<Basic structure of seat cushion frame>> 28 is a perspective view of a seat cushion frame 810 according to the eighth embodiment. The seat cushion frame 810 serves as a framework for a seat cushion (not shown). The seat cushion frame 810 is covered with a seat cushion pad (not shown) and a covering material (not shown).

[0192] The seat cushion frame 810 is mainly composed of cushion side frames 811 as side frames, a fixed pan frame 812, a movable pan frame 813 that is movable in the front-to-rear direction, a front pipe 814, and a rear pipe 815. The seat cushion frame 810 also has a pressure-receiving member 520 and a support member 530 between the left and right cushion side frames 811.

[0193] The fixed pan frame 812 has left and right side members 812a extending in the front-to-rear direction, and a front member 812b connecting the front ends of the side members 812a. The left and right side members 812a and the front member 812b are formed by bending a metal plate. The front member 812b has a plate-shaped portion 812c in the center in the left-to-right direction. The plate-shaped portion 812c has a predetermined width in the front-to-rear direction. The plate-shaped portion 812c has a through-hole (not shown) formed in it, through which a fastening member 816 (described later) can be inserted.

[0194] The movable pan frame 813 is disposed so as to be slidable in the front-to-rear direction relative to the plate-shaped portion 812c of the front member 812b. The movable pan frame 813 has an upper plate 813a placed on the plate-shaped portion 812c, and a front plate 813b extending downward from the front of the upper plate 813a and disposed in front of the front member 812b.

[0195] The upper plate 813a is formed with a plurality of elongated holes 813d that penetrate through the thickness direction and extend in the front-to-rear direction. Two elongated holes 813d are provided on each side. The fastening members 816 described above are inserted between the elongated holes 813d and the through holes formed in the plate-shaped portion 812c. The fastening members 816 are fixed to the through holes. The movable pan frame 813 is guided by the elongated holes 813d and can slide in the front-to-rear direction relative to the fixed pan frame 812.

[0196] A fixing portion 813e is formed behind the upper plate 813a to which the front end of the wire 521 of the pressure receiving member 520 is fixed. As will be described later, when the movable pan frame 813 is slid in the front-to-rear direction by the length adjustment mechanism 820, the wire 521 moves in the front-to-rear direction in conjunction with the movable pan frame 813. Accordingly, the front pressure receiving plate 522, central pressure receiving plate 523, and rear pressure receiving plate 524 of the pressure receiving member 520 move in the front-to-rear direction. The interlocking of the length adjustment mechanism 820 and the pressure receiving member 520 will be described later.

[0197] 29, the fixed pan frame 812 has a box body 812k. The box body 812k has a front wall 812e extending substantially vertically on the front side, a rear wall 812f facing the front wall 812e behind the front wall 812e, a side wall 812g connecting the front wall 812e and the rear wall 812f, and a bottom wall 812h. The box body 812k has, at its rear, a rear flange 812m fixed to a reinforcing portion 812l formed below the plate-like portion 812c, and a plurality of reinforcing ribs 812n connecting the rear wall 812f and the rear flange 812m.

[0198] A pressure plate 813c fixed to the movable pan frame 813 is located between the front wall 812e and the rear wall 812f. A first actuator 821 that drives the movable pan frame 813 forward relative to the fixed pan frame 812 is disposed behind the pressure plate 813c. A second actuator 822 that drives the movable pan frame 813 backward relative to the fixed pan frame 812 is disposed in front of the pressure plate 813c.

[0199] The first actuator 821 biases the movable pan frame 813 forward. The first actuator 821 has a plurality of first fluid bladders 821a that expand when compressed air is injected into them and contract when the compressed air is discharged from them. The second actuator 822 biases the movable pan frame 813 rearward. The second actuator 822 has a plurality of second fluid bladders 822a that expand when compressed air is injected into them and contract when the compressed air is discharged.

[0200] <<Length adjustment mechanism>> Next, a length adjustment mechanism 820 that adjusts the length of the seat cushion in the front-rear direction according to the eighth embodiment will be described with reference to Fig. 30. Fig. 30 shows a configuration block diagram of the length adjustment mechanism 820. As shown in Fig. 30, the length adjustment mechanism 820 mainly includes a first actuator 821, a second actuator 822, a compressor 823, and an ECU 850.

[0201] The ECU 850 controls the entire length adjustment mechanism 820. More specifically, the ECU 850 controls the biasing force generated by the first fluid bladder 821a and the second fluid bladder 822a by injecting and discharging compressed air. The compressed air is generated by a compressor 823. The first fluid bladder 821a and the compressor 823 are connected to a first connecting pipe 825 via a first control valve 824. The second fluid bladder 822a and the compressor 823 are connected to a second connecting pipe 827 via a second control valve 826. The ECU 850 controls the opening and closing of the first control valve 824 and the second control valve 826 to inject or discharge the compressed air generated by the compressor 823 into or from the first fluid bladder 821a and the second fluid bladder 822a. The operation switch 828 has an extension button and a contraction button, and outputs an output signal to the ECU 850 in response to the operation of the extension button or contraction button.

[0202] Based on the output signal of the operation switch 828, the ECU 850 controls the expansion and contraction of the first fluid bladder 821a and the second fluid bladder 822a, and moves the movable pan frame 813 in the front-to-rear direction. This makes it possible to expand and contract the seat cushion to an appropriate length according to the body shape of the seated occupant. Furthermore, as the movable pan frame 813 moves, the front pressure receiving plate 522, the central pressure receiving plate 523, and the rear pressure receiving plate 524 of the pressure receiving member 520 move in the front-to-rear direction. This makes it possible to position the front pressure receiving plate 522, the central pressure receiving plate 523, and the rear pressure receiving plate 524 in appropriate positions according to the body shape of the seated occupant.

[0203] In this case, a stretchable elastic member may be interposed between the above-mentioned connecting portion 535 and the fourth portion 534. This makes it possible for the support member 530 to appropriately support the pressure-receiving member 520 even when the pressure-receiving member 520 is moved in the front-rear direction by the length adjustment mechanism 820. Furthermore, the connecting portion 535 itself may be formed of a stretchable elastic member.

[0204] <<Modifications>> In the eighth embodiment described above, the pressure receiving member 520 is supported by the wire 521 stretched between the movable pan frame 813 and the rear pipe 514, but this is not limiting. The pressure receiving member 520 may also be supported by a long, stretchable elastic member. The stretchable elastic member may be stretched between the movable pan frame 813 and the rear pipe 514 to support the pressure receiving member 520 and connect it to the rear pipe 514. This makes it possible to adjust the pressure receiving performance of the pressure receiving member 520 in conjunction with the forward movement of the movable pan frame 813 by the length adjustment mechanism 820.

[0205] Ninth Embodiment A vehicle seat S901 according to the ninth embodiment will be described below with reference to FIGS. BACKGROUND ART Vehicle seats have been known that include an air passage and a blower inside the seat, and that can guide air blown out by the blower to a seating surface and blow it against a seated occupant. A patent document (JP 2020-110702 A) discloses a vehicle seat in which a ventilation passage is formed in the pad.

[0206] Further improvements have been desired for vehicle seats with ventilation channels formed within the pad, namely, a vehicle seat that can increase comfort and reduce fatigue of the occupant by blowing air at an appropriate temperature from the seating surface toward the occupant.

[0207] The vehicle seat S901 has an air passage 941 formed in the seat cushion S911 and the seat back S912, which sends conditioned air blown from a blower to the seating surface of the vehicle seat S901. The vehicle seat S901 further has a fluid bag 960 that can be inflated and deflated with compressed air, disposed between the pad and the upholstery material. The air passage 941 and the fluid bag 960 are positioned so as not to overlap when viewed from the seating surface. This makes it possible to prevent the air passage 941 and the fluid bag 960 from interfering with or affecting each other.

[0208] <<Basic structure of a vehicle seat>> Fig. 31 is a perspective view showing the basic configuration of a vehicle seat S901. As shown in Fig. 31, the vehicle seat S901 mainly comprises a seat cushion S911, a seat back S912, and a headrest S913.

[0209] The seat cushion S911 is mainly composed of a seat cushion frame (not shown) that forms the framework of the seat cushion S911, and a pad 911 and a cover material 930 that cover the seat cushion frame. The seat back S912 is mainly composed of a seat back frame (not shown) that forms the framework of the seat back S912, and a pad (not shown) and a covering material (not shown) that cover the seat back frame.

[0210] The pad 911 of the seat cushion S911 has an air passage 941 through which conditioned air output by an air conditioner (not shown) passes. The air passage 941 is formed with an inlet 942 through which the conditioned air output by the air conditioner flows in, and a plurality of outlets 943 through which the conditioned air is blown out from below toward the seated occupant. The inlet 942 is formed on the rear side, in the center in the left-right direction of the seat cushion S91. The outlets 943 are formed four on each side, forward of the inlet 942. The arrangement of the air passage 941, the inlet 942, and the outlet 943 is not limited to the arrangement shown in FIG. 31 . It is sufficient that the comfort of the seated occupant can be increased by blowing the conditioned air output by the air conditioner toward the seated occupant.

[0211] A seating sensor 945 for detecting that an occupant is seated on the vehicle seat S901 is built in between the pad 911 of the seat cushion S911 and the cover material 930. The seating sensor 945 is a sensor that can detect that an occupant is seated, and is, for example, a weight sensor. A control circuit 946 that controls electrical components (various sensors and actuators) arranged in the vehicle seat S901 is also arranged in the seat cushion S911. The seating sensor 945 and the control circuit 946 are electrically connected by a harness 947. In other words, a detection signal of the seating sensor 945 is output to the control circuit 946 via the harness 947.

[0212] In addition, a plurality of fluid bladders 960 are disposed between the pad 911 and the cover material 930. The fluid bladders 960 are expanded by injecting compressed air and contracted by discharging the compressed air. The fluid bladders 960 are mainly composed of a thigh fluid bladder 960a, a lumbar fluid bladder 960b, and a side fluid bladder 960c. The thigh fluid bladder 960a is built into the seat cushion S911 and mainly supports the thighs of the seated occupant. The lumbar fluid bladder 960b is built into the seat back S912 and mainly supports the lumbar region of the seated occupant. The side fluid bladder 960c is built into the seat back S92 and mainly supports the torso of the seated occupant from the sides.

[0213] 31, the fluid bag 960 is disposed at a position that does not overlap with the ventilation passage 941 when viewed from the seating surface. This makes it possible to prevent the fluid bag 960 from obstructing the flow of conditioned air passing through the ventilation passage 941 when it is inflated. Furthermore, when the fluid bag 960 inflates, it protrudes upward without descending downward, making it possible to effectively stimulate the seated occupant.

[0214] The fluid bladder 960 is disposed at a position overlapping the seating sensor 945 when viewed from the seating surface. This allows the seating sensor 945 to detect the pressure generated when the fluid bladder 960 expands in addition to the weight of the seated person. This makes it possible to prevent the seating sensor 945 from failing to detect the seated person.

[0215] In addition, the fluid bag 960 is disposed at a position that does not overlap with the harness 947 that electrically connects the seating sensor 945 and the control circuit 946 when viewed from the seating surface. This makes it possible to prevent the harness 947 from being damaged by the load received when an occupant sits on the seat and the pressure generated when the fluid bag 960 expands.

[0216] Fig. 32 shows an exploded perspective view of the pad 911 of the seat cushion S911. As shown in Fig. 32, the pad 911 mainly comprises a pad main body 912, a first cover member 920, and a second cover member 921. The pad main body 912, the first cover member 920, and the second cover member 921 are made of urethane foam. The pad 911 is used in a state in which the first cover member 920 and the second cover member 921 are placed on the pad main body 912 and overlapped.

[0217] The pad main body 912 has a central portion 912a, and side portions 912b are integrally formed on both the left and right sides of the central portion 912a. The central portion 912a is formed with a cover mounting portion 912c on which the first cover member 920 and the second cover member 921 are placed, and an inlet 942 through which conditioned air flows in. First engaging portions 912d are formed on the left and right side surfaces of the cover mounting portion 912c, and engage with engaged portions 920a formed on a first cover member 920, which will be described later. In addition, a second engaging portion 912e is formed in front of the cover mounting portion 912c, and engages with engaged portions 921a formed on a second cover member 921, which will be described later.

[0218] The first cover member 920 and the second cover member 921 are members that are placed on the upper surface of the cover attachment portion 912c of the pad main body 912 to form an air passage 941 between them and the pad main body 912.

[0219] The first cover member 920 is a plate-shaped member. The first cover member 920 has ventilation holes 920b formed therein. The ventilation holes 920b form ventilation passages 941 between the upper surface of the pad main body 912 and the second cover member 921. More specifically, conditioned air flowing in through an inlet 942 formed in the pad main body 912 passes through the ventilation holes 920b and is blown out from an outlet 943 formed in the second cover member 921, which will be described later. As described above, the ventilation holes 920b are formed in a position that does not overlap with the fluid bladder 960 when viewed from the seating surface. This makes it possible to inflate and deflate the fluid bladder 960 disposed on the pad 911 without being affected by the ventilation passage 941. On the left and right side surfaces of the first cover member 920, engaged portions 920a that engage with the first engaging portions 912d of the pad main body 912 are formed.

[0220] The second cover member 921 is a plate-shaped member. Four air outlets 943 are formed on each of the left and right sides of the second cover member 921. The air outlets 943 are formed in positions that do not overlap with the fluid bags 960 when viewed from the seating surface. To explain in detail, as shown in FIG. 31 , the air outlets 943 are formed so as to be positioned between the multiple fluid bags 960. The air outlets 943 are also formed so as to be positioned forward of the fluid bags 960. This makes it possible to prevent the flow of conditioned air blown out from the air outlets 943 from being obstructed by the fluid bags 960 arranged on the pad 911. A seating sensor mounting portion 921b for mounting a seating sensor 945 is formed at the rear of the second cover member 921. The seating sensor mounting portion 921b is formed at a position overlapping with the fluid bag 960 when viewed from the seating surface. This allows the seating sensor 945 to reliably detect the load applied when an occupant sits on the seat. An engaged portion 921a that engages with the second engaging portion 912e of the pad main body 912 is formed on the front of the second cover member 921.

[0221] When assembling the pad 911 configured in this manner, first, adhesive is applied to the upper surface of the cover attachment portion 912c, which is the upper surface of the pad main body 912. Then, the first cover member 920 is placed on the cover attachment portion 912c while engaging the first engaging portion 912d of the pad main body 912 with the engaged portion 920a of the first cover member 920. The first cover member 920 is fixed to the pad main body 912 by the adhesive.

[0222] Next, adhesive is applied to the upper surface of the first cover member 920. Then, the second cover member 921 is placed on the first cover member 920 while engaging the second engaging portion 912e of the pad main body 912 with the engaged portion 921a of the second cover member 921. The second cover member 921 is fixed to the first cover member 920 and the pad main body 912 by the adhesive.

[0223] This completes the assembly of the pad 911. It is now possible to guide the conditioned air to the seating surface without incorporating a ventilation pipe for passing the conditioned air inside the pad 911. Therefore, when a seated person sits down, they can sit comfortably without feeling uncomfortable due to the presence of the ventilation pipe.

[0224] Although the pad 911 of the seat cushion S911 has been described above, the present invention is not limited to this. For example, the present invention can be applied to the pad 911 of the seat back S912. In this case, the first cover member 920 and the second cover member 921 are arranged to overlap the front surface of the pad 912 main body (the surface on the seat occupant side).

[0225] Tenth Embodiment A vehicle seat S1001 according to the tenth embodiment will be described below with reference to FIGS. 2. Description of the Related Art Vehicle seats have been known that are equipped with airbag devices and that can improve the safety of a seated occupant by deploying the airbag devices when a vehicle collision is detected. A patent document (JP 2020-050269 A) discloses a vehicle seat that can suppress forward movement of the occupant's lower back (submarine phenomenon) by first inflating the portion of the airbag body located below the back of the occupant's knees when a vehicle collision is detected.

[0226] However, further improvements have been desired for vehicle seats equipped with airbag devices to ensure the safety of occupants when a collision is detected. Specifically, there has been a demand for a vehicle seat that can suppress the submarine phenomenon by inflating a fluid bladder disposed within the vehicle seat before a collision is detected, i.e., when a collision is predicted.

[0227] The vehicle seat S1001 has a collision prediction unit 1052a that predicts a vehicle collision and a collision determination unit 1052b that determines a vehicle collision. The vehicle seat S1001 also has a fluid bladder 1060 that inflates and deflates by injecting or discharging fluid, and an airbag device 1070. The ECU 1050 of the vehicle seat S1001 controls the inflation and deflation of the fluid bladder 1060 based on the prediction result of the collision prediction unit 1052a, and activates the airbag device 1070 based on the determination result of the collision determination unit 1052b. As a result, the collision prediction unit 1052a predicts a collision before the airbag device 1070 is activated, thereby appropriately protecting the seated occupant and improving the safety of the seated occupant.

[0228] <<Basic structure of a vehicle seat>> Fig. 33 is a perspective view showing the basic configuration of a vehicle seat S1001. As shown in Fig. 33, the vehicle seat S1001 mainly comprises a seat cushion S1011, a seat back S1012, and a headrest S1013.

[0229] The seat cushion S1011 is mainly composed of a seat cushion frame 1010 that forms the framework thereof, and a seat cushion pad S1011a and a covering material S1011b that cover the seat cushion frame 1010. The seat back S1012 is mainly composed of a seat back frame (not shown) forming its skeleton, a seat back pad (not shown) covering the seat back frame, and a skin material (not shown).

[0230] The vehicle seat S1001 incorporates a plurality of fluid bags 1060. The fluid bags 1060 expand by injecting fluid and contract by discharging fluid. The fluid bags 1060 are mainly composed of a hip fluid bag 1061 that mainly supports the hips of the seated person, a thigh fluid bag 1062 that mainly supports the thighs, a waist fluid bag 1063 that mainly supports the waist, and a side fluid bag 1064 that supports the body from the side.

[0231] Figure 34 is a partial cross-sectional view of the vehicle seat S1001. As shown in Figure 34, the seat cushion S1011 incorporates an airbag device 1070. The airbag device 1070 inflates to protect the seated person when the vehicle is impacted from the front due to a frontal collision or the like. The airbag device 1070 has an airbag body 1071, an inner bag 1072 housed in the airbag body 1071, and a gas generator 1073 housed in the inner bag 1072 and supplying inflation gas. The operation of the airbag device 1070 will be described later.

[0232] <<Functional Configuration of ECU>> Figure 35 is a block diagram showing the functional configuration of the ECU 1050. The ECU 1050 obtains the detection values of various sensors by communicating with various sensors installed in the vehicle through an in-vehicle network. The various sensors include the weight sensor 40, vehicle speed sensor 41, steering angle sensor 42, pressure sensor 43, bulging pressure sensor 44, and rotation angle sensor 45 described above. The ECU 1050 in this embodiment can further obtain the detection values of the external sensor 1046 and the collision sensor 1047.

[0233] The external sensor 1046 is a sensor that detects the external situation, which is information about the surroundings of the vehicle. In particular, the external sensor 1046 can be configured with a lidar that measures scattered light relative to light irradiated in all directions from the vehicle to measure the distance from the vehicle to surrounding obstacles. The external sensor 1046 can also be configured with a radar that detects other vehicles, obstacles, etc. around the vehicle by irradiating electromagnetic waves and detecting reflected waves. The external sensor 1046 can also be configured with an optical sensor that captures images of the surroundings of the vehicle. The collision sensor 1047 is a sensor that detects a vehicle collision. Specifically, the collision sensor 1047 is an acceleration sensor attached to the front, rear, and sides of the vehicle.

[0234] The ECU 1050 includes an acquisition unit 1051, a determination unit 1052, and a drive unit 1053. The acquisition unit 1051 acquires the detection values ​​of the various sensors as described above. The determination unit 1052 includes a collision prediction unit 1052a and a collision determination unit 1052b.

[0235] The collision prediction unit 1052a detects objects around the vehicle based on the detection values ​​of the external sensor 1046. Then, the collision prediction unit 1052a determines the type of object (for example, a pedestrian or another vehicle) from the characteristics of the detected object. Next, the collision prediction unit 1052a calculates the probability of collision between the detected object and the vehicle. The calculation of the collision probability is performed taking into account the approach speed of the object to the vehicle. The collision prediction unit 1052a may determine the type of collision between the vehicle and the object (frontal collision, rear-end collision, side collision) and calculate the collision probability in the case of a specific collision (for example, a frontal collision).

[0236] The collision prediction unit 1052a compares the calculated collision probability with a predetermined threshold value and outputs the collision prediction result to the driving unit 1053. The collision prediction result includes information that can identify the type of collision.

[0237] The collision determination unit 1052b acquires acceleration signals, which are detection values ​​of collision sensors 1047 attached to the front, rear, and sides of the vehicle. The collision determination unit 1052b compares the acceleration signals with a predetermined threshold value and outputs a collision determination result to the drive unit 1053. The collision determination result includes information that can identify the type of collision.

[0238] When the collision prediction result is input from the collision prediction unit 1052a, the driving unit 1053 controls the opening / closing degree of the electromagnetic valve 56, thereby expanding / contracting the fluid bag 1060. When the collision prediction result indicating a frontal collision is input from the collision prediction unit 1052a, the drive unit 1053 contracts the buttocks fluid bladder 1061 built into the seat cushion S1011 and inflates the thigh fluid bladder 1062, as shown in Fig. 36. This causes the front of the seat cushion S101 to protrude upward and become relatively higher than the rear. This makes it possible to suppress the phenomenon (submarine phenomenon) in which the seated occupant floats up from the seat cushion S1011 and moves forward. Although the driving unit 1053 has been described as contracting the buttocks fluid bladder 1061 and inflating the thigh fluid bladder 1062, the present invention is not limited to this. That is, only one of the control to contract the buttocks fluid bladder 1061 and the control to inflate the thigh fluid bladder 1062 may be performed.

[0239] When the collision prediction result indicating a rear-end collision is input from the collision prediction unit 1052a, the drive unit 1053 inflates the lumbar fluid bladder 1063 built into the seat back S1102. This allows the lumbar fluid bladder 1063 to inflate before a rear-end collision occurs, thereby improving safety against impacts during a rear-end collision.

[0240] When the collision prediction result indicating a side collision is input from the collision prediction unit 1052a, the drive unit 1053 does not inflate the side fluid bag 1064 built into the seat back S102. This makes it possible for the seated occupant to be protected from impact by the airbag device (not shown) disposed on the side of the seated occupant without being interfered with by the side fluid bag 1064.

[0241] Furthermore, when a side collision is predicted, a support plate built into the side support portion S1012a of the seat back S1012 may be displaced to a retracted position. In the normal state, the support plate biases the seatback pad forward from the rear surface of the seatback pad. When a signal predicting a side collision is input, the drive unit 1053 controls the actuator (not shown) to retract the support plate to a rearward position. This allows the airbag device (not shown) located on the side of the seat occupant to protect the seat occupant from the impact without interference from the support plate.

[0242] When the collision determination result indicating a frontal collision is input from the collision determination unit 1052b, the driving unit 1053 activates the airbag device 1070 built into the seat cushion S1011 as shown in FIG.

[0243] Here, a more detailed description will be given of the operation of inflating the airbag device 1070. As shown in Fig. 38, an inner bag 1072 is housed inside an airbag body 1071 of the airbag device 1070, and a gas generator 1073 is housed inside the inner bag 1072.

[0244] When the vehicle undergoes a frontal collision and the drive unit 1053 activates the airbag device 1070, the gas generator 1073 generates high-pressure gas for inflation. As a result, the inner bag 1072 that houses the gas generator 1073 expands. The inner bag 1072 is formed with discharge holes 1072a through which the high-pressure gas can be discharged. Therefore, the front portion 1071a of the airbag body 1071 expands due to the high-pressure gas discharged from the discharge holes 1072a of the inner bag 1072. On the other hand, the rear portion 1071b of the airbag body 1071 remains in a contracted state due to the load of the seated person. The discharge holes 1072a are located in the vicinity of the back of the knee from the front of the thigh of the seated person. Therefore, it is possible to suppress the occurrence of a phenomenon (submarine phenomenon) in which the seated person moves forward in a state of rising from the seat cushion S1011 during a frontal collision of the vehicle.

[0245] Note that the operation of the drive unit 1053 when the collision prediction result and the collision determination result are input is not limited to the above-described operation. For example, the drive unit 1053 may retract the support plate built into the side support portion S1012a when a side collision result is input from the collision determination unit 1052b.

[0246] <<Processing Flow of ECU1050>> Next, the operation of the ECU1050 will be described. FIG. 38 is a flowchart showing an example of the processing executed by the ECU1050 according to a program stored in advance. This flowchart is repeatedly executed at a predetermined time interval. First, the ECU1050 acquires the output signals of various sensors installed in the vehicle (step S10).

[0247] Next, the ECU1050 determines whether the acceleration signal detected by the collision sensor 1047 is greater than a predetermined threshold value TH1 (step S11). Here, the ECU1050 will be described by comparing the acquired acceleration signal with the threshold value TH1 for frontal collision, but the same applies to rear collision and side collision cases.

[0248] If it is determined that the acceleration signal is not greater than threshold value TH1 (step S11: No), ECU 1050 calculates the collision probability (step S12) based on the external signal detected by external sensor 1046. ECU 1050 calculates the collision probability of a frontal collision based on the acquired external signal. Next, the ECU 1050 determines whether the collision probability is greater than a predetermined threshold value TH2 (step S13), and compares it with the threshold value TH2 for a frontal collision.

[0249] If it is determined that the collision probability is greater than the threshold value TH2 (step S13: Yes), the ECU 1050 controls the thigh fluid bladder 1062 to inflate (step S14). At this time, the buttocks fluid bladder 1061 may be controlled to contract. As a result, the front of the seat cushion S101 protrudes upward and becomes relatively higher than the rear. On the other hand, if it is not determined that the collision probability is greater than threshold value TH2 (step S13: No), ECU 1050 controls thigh fluid bladder 1062 to contract (step S15), and ends the process.

[0250] On the other hand, if it is determined that the acceleration signal is greater than the threshold value TH1 (step S11: Yes), the ECU 1050 activates the airbag device 1070 built into the seat cushion S101 (step S16), and ends the process.

[0251] In this way, ECU 1050 controls thigh fluid bladder 1062 to inflate and protrude the front of seat cushion S101 upward at the timing when a collision is predicted before the vehicle actually collides, thereby making it possible to more effectively suppress the occurrence of the submarine phenomenon.

[0252] Eleventh Embodiment A vehicle seat S1101 according to the eleventh embodiment will be described below with reference to FIGS. BACKGROUND ART Conventionally, quilting has been applied to the covering material of a vehicle seat in order to improve the design of the vehicle seat. Patent document (JP 2015-143067 A) discloses a vehicle seat that is made of fabric containing a heat-shrinkable material and has an enhanced design due to quilting.

[0253] However, further improvements have been desired for quilted vehicle seats. Specifically, there has been a demand for a vehicle seat that can further improve design by providing a fluid bladder that can be inflated and deflated by supplying fluid between the upholstery material and the pad, thereby highlighting the uneven shape formed by the quilting.

[0254] The vehicle seat S1101 has a cover material 1130 on which a quilting pattern 1131 having a concave-convex shape is formed. Furthermore, an inflatable fluid bladder 1140 is disposed inside the cover material 1130 in a position that does not overlap with concave portions 1133 of the quilting pattern 1131 when viewed from the seating surface. This makes it possible, when the fluid bladder 1140 is inflated, to highlight convex portions 1132 of the quilting pattern 1131 while maintaining the regularity of the concave-convex shape of the quilting pattern 1131. This also makes it possible to prevent the decorativeness of the quilting pattern 1131 from being reduced due to the expansion of the fluid bladder 1140.

[0255] <<Basic structure of a vehicle seat>> Fig. 39 is a perspective view showing the basic configuration of a vehicle seat S1101. As shown in Fig. 39, the vehicle seat S1101 mainly comprises a seat cushion S1111, a seat back S1112, and a headrest S1113.

[0256] The seat cushion S1111 is mainly composed of a seat cushion frame (not shown) that forms the skeleton of the seat cushion S1111, and a pad (not shown) and a covering material (not shown) that cover the seat cushion frame. The seat back S1112 is mainly composed of a seat back frame (not shown) that forms the framework of the seat back S1112, a pad 1120 (see FIG. 40) that covers the seat back frame, and a cover material 1130.

[0257] A quilting pattern 1131 is formed on the cover material 1130 of the seat cushion S1111 and the seat back S1112. The quilting pattern 1131 has protrusions 1132 and recesses 1133. The protrusions 1132 and recesses 1133 are regularly arranged in a grid pattern. The quilting pattern 1131 can be formed by a known quilting process that includes a step of sewing together the cover material 1130 made of a laminate. By quilting the cover material 1130, the cushioning and decorative properties of the vehicle seat S1101 can be improved.

[0258] A plurality of fluid bladders 1140 are disposed between the pad 1120 and the cover material 1130. The fluid expands when a fluid is injected into the bladders and contracts when the fluid is discharged. In this embodiment, the fluid is compressed air, but is not limited to this. The fluid may also be a liquid. In other words, the plurality of fluid bladders 1140 may be either compressed air bladders that expand with compressed air or liquid bladders that expand with liquid, or a combination of compressed air bladders and liquid bladders. By combining compressed air bladders with liquid bladders that have lower elasticity than compressed air, it is possible to appropriately adjust the elasticity or rigidity of the fluid bladders 1140.

[0259] 39, the fluid bladder 1140 is disposed at a position that does not overlap the recessed portions 1133 of the quilted pattern 1131 when viewed from the seating surface. In other words, the fluid bladder 1140 is disposed at a position that overlaps the protruding portions 1132 of the quilted pattern 1131. This prevents the upholstery material 1130 from being deformed by the expansion of the fluid bladder 1140, thereby preventing distortion of the regular concave-convex shape of the quilted pattern 1131. This makes it possible to maintain the decorativeness of the quilted pattern 1131 formed on the upholstery material 1130 of the vehicle seat S1101.

[0260] Fig. 40 shows a partial cross-sectional view of the seat back S1112. As shown in Fig. 40, the fluid bladder 1140 located between the pad 1120 and the cover material 1130 has at least a first fluid bladder 1141 disposed on the rear side (the pad 1120 side) and a second fluid bladder 1142 disposed on the front side (the cover material 1130 side). The first fluid bladder 1141 and the second fluid bladder 1142 are stacked.

[0261] The first fluid bladder 1141 has a larger capacity than the second fluid bladder 1142. The area where the first fluid bladder 1141 abuts against the pad 1120 is larger than the area where the second fluid bladder 1142 abuts against the upholstery material 1030. The first fluid bladder 1141 has higher rigidity than the second fluid bladder 1142. As described above, when the first fluid bladder 1141 and the second fluid bladder 1142 expand, the first fluid bladder 1141 and the second fluid bladder 1142 are prevented from displacing toward the pad 1120, and the first fluid bladder 1141 can fulfill the role of supporting the second fluid bladder 1142 as a base material. Therefore, the protrusion of the second fluid bladder 1142 can effectively stimulate the seated occupant.

[0262] The first fluid bag 1141 and the second fluid bag 1142 can be fixed in a stacked state by welding them to each other. This allows the first fluid bag 1141 to more firmly support the second fluid bag 1142. The first fluid bag 1141 and the second fluid bag 1142 may also be fixed by bonding them together using an adhesive.

[0263] <Twelfth embodiment> A vehicle seat S1201 according to the twelfth embodiment will be described below with reference to FIGS. As a technique for detecting whether an occupant is seated in a vehicle seat S1201 or detecting biological information of the occupant, a vehicle seat provided with a sensor member in the seating portion is known. A patent document (JP 2013-095373 A) discloses a technique in which a conductive part (harness) of a seating sensor is routed through a hole that penetrates a pad member, and a connector part (coupler) is arranged on the back surface of the pad member.

[0264] In this way, if the pad member is thin and the connector (coupler) is located on the back surface of the pad member, the seating comfort may be worsened if the connector is located below the seating area. Also, depending on the routing of the conductive part, the seating comfort may be worsened due to the occurrence of slack in the conductive part.

[0265] Therefore, when the vehicle seat S1201 is provided with a sensor member, conductive parts such as harnesses and connectors such as couplers are appropriately arranged to improve seating comfort.

[0266] The vehicle seat S1201 has the appearance shown in Fig. 41. The vehicle seat S1201 has, as its main components, a seat cushion S1211 serving as a buttocks support portion (sitting portion) that supports the buttocks of a seated occupant, a seat back S1212 serving as a backrest portion (sitting portion) that supports the back of the seated occupant, and a headrest S1213 that is disposed on top of the seat back S1212 and supports the head of the seated occupant.

[0267] The seat cushion S1211 (sitting portion) of this embodiment has a seat cushion pad 1210 (pad member), a sensor member 1220, and a trim cover 1230 (skin material).

[0268] The seat cushion S1211 is configured by placing a seat cushion pad 1210 on a vehicle body (support portion) (not shown) and further covering the seat cushion pad 1210 with a trim cover 1230. The seat back S122 is configured by placing a seat back pad (not shown) on a seat back frame (not shown) and covering it with a trim cover 1230. The headrest S123 is formed by disposing a pad member (not shown) on a core material and covering it with the trim cover 1230.

[0269] The seat cushion pad 1210 of the seat cushion S121 and the seat back pad of the seat back S122 are made of a urethane base material formed by foam molding using a urethane foam material.

[0270] <<Seat cushion of this embodiment>> The configuration of the seat cushion S1211 of the vehicle seat S1201 will be described with reference to Fig. 42 to Fig. 44. Fig. 42 is a cross-sectional view taken along line AA in Fig. 41. Fig. 43 is a cross-sectional view taken along line AA in Fig. 41, showing an example in which a recess 1212b of a seat cushion pad 1210 is provided with a protrusion 1212c. Fig. 44 is a view showing a connector 1223 housed in the recess 1212b of the seat cushion pad 1210. Note that the trim cover 1230 is not shown in Fig. 44.

[0271] <<<Seat cushion pad 1210>>> 41 and 42, the seat cushion pad 1210 has a front surface 1210a arranged on the seating surface side (upper side) in the up-down direction and a back surface 1210b arranged on the back surface side (lower side). The seat cushion pad 1210 also has a front end portion 1211 (first end portion) arranged on the front side in the front-rear direction and a rear end portion 1212 (second end portion) arranged on the rear side. The seat cushion pad 1210 also has side end portions 1213 arranged on both sides in the seat width direction.

[0272] 42, the seat cushion pad 1210 has a through-hole 1214 formed from the front surface 1210a (sitting surface side) to the back surface 1210b (back surface side), and a recess 1212b formed in the rear end 1212 (end). The rear end 1212 (end) of the seat cushion pad 1210 has a bulging portion 1212a (pillow portion) that protrudes upward (toward the sitting surface), and the recess 1212b is provided in the bulging portion 1212a. The recess 1212b is formed below the bulging portion 1212a, recessed forward from the rear end 1212 (end).

[0273] <<<Sensor member 1220>>> The sensor member 1220 includes a detection unit 1221 that detects the state of a seated occupant, an external output unit 1222 that outputs a signal detected by the detection unit 1221, a connector 1223 (coupler) connected to the external output unit 1222, and a conductive unit 1224 (harness) as a wiring member that provides electrical conduction between the detection unit 1221 and the external output unit 1222 (Figure 42).

[0274] The type of sensor member 1220 is not particularly limited as long as it can detect the state of the seated occupant, and examples include a pressure sensor such as a membrane switch, an electrode type sensor that measures impedance fluctuations, a pressure sensor equipped with a piezoelectric element, an air tube type sensor that measures air pressure, a capacitance sensor that measures changes in capacitance, an optical sensor that uses variations in light absorption rate due to hemoglobin concentration, and a radio wave type sensor.

[0275] The state of the seated occupant detected by the sensor member 1220 is not particularly limited, and examples include whether the occupant is seated, the seating state, the state of the heartbeat, the state of breathing, and values ​​of biological information such as blood flow and hemoglobin concentration. In other words, the sensor member 1220 is appropriately selected depending on the state of the seated occupant to be detected.

[0276] When the sensor member 1220 is a seating sensor, a membrane switch can be used as the detection unit 1221. As the sensor member 1220, various conventionally known sensors can be used, such as a pressure-sensitive film sensor that has a plurality of pressure-sensitive points and detects whether or not a person is seated based on the output distribution of the pressure-sensitive points.

[0277] The detection unit 1221 and the external output unit 1222 are electrically connected by a conductive unit 1224. The external output unit 1222 outputs a signal detected by the detection unit 1221 and is formed with an output electrode. A connector 1223 is connected to the external output unit 1222, and the connector is linked to an ECU (Electronic Control Unit) that has an electrical circuit (not shown) that measures the state of the seated occupant.

[0278] <<<Regarding the arrangement of the sensor member 1220>>> 42, a detection unit 1221 is disposed on the front surface 1210a side (sitting surface side) of the seat cushion pad 1210. A conductive portion 1224 extending rearward from the detection unit 1221 is inserted into a through-hole 1214 of the seat cushion pad 1210 and bent downward at a first bent portion 1224a. The conductive portion 1224 is inserted into the through-hole 1214 and reaches a back surface 1210b of the seat cushion pad 1210, where it is bent rearward at a second bent portion 1224b.

[0279] A connector 1223 is housed in a recess 1212b on the back surface 1210b side of the seat cushion pad 1210. A trim cover 1230 covers the front surface 1210a side (seating surface side) of the seat cushion pad 1210 and the recess 1212b.

[0280] In other words, the connector 1223 is supported by being sandwiched between the recess 1212b of the seat cushion pad 1210 and the trim cover 1230. The connector 1223 is not secured using a mounting bracket, but is simply sandwiched between the recess 1212b and the trim cover 1230, making it possible to properly fix the connector 1223 with a simple configuration.

[0281] The conductive portion 1224 (harness) of the sensor member 1220 is also covered by the trim cover 1230 on the front surface 1210a and the back surface 1210b of the seat cushion pad 1210, thereby stably fixing the conductive portion 1224 to the seat cushion pad 1210. In particular, the portion of the conductive portion 1224 that is bent at the second bend portion 1224b and extends rearward from the through-hole 1214 is sandwiched between the back surface 1210b of the seat cushion pad 1210 and the trim cover 1230, thereby preventing the conductive portion 1224 from becoming loose.

[0282] In the vehicle seat S1201 of this embodiment, the through-hole 1214 and the connector 1223 are provided in the seat cushion S1211 rearward of the portion where the sitting load acts (hip point).

[0283] Specifically, in the vehicle seat S1201, a recess 1212b (connector accommodating portion) for accommodating the connector 1223 is provided in the rear end portion 1212, which is the rear end portion of the seat cushion S1211 (sitting portion) that avoids the position where the weight of the seated person is applied, and the recess 1212b is covered with a trim cover 1230, thereby preventing the connector 1223 from reducing the seating comfort and preventing the connector 1223 from falling off.

[0284] In addition, a bulging portion 1212a that protrudes toward the seating surface is formed at the rear end portion 1212, which is the rear end portion of the seat cushion pad 1210, and a recessed portion 1212b is provided in the bulging portion 1212a. This configuration is preferable because it allows the connector 1223 to be stably housed in the recessed portion 1212b.

[0285] In the above example, the seating portion is the seat cushion S121 serving as a buttocks support portion (seating portion) that supports the buttocks of a seated person, the bulging portion 1212a is formed at the rear end portion 1212 of the seat cushion pad 1210, and the recessed portion 1212b is provided at the rear end of the bulging portion 1212a. With this configuration, the connector 1223 is housed in the recessed portion 1212b of the bulging portion 1212a formed at the rear end portion of the seat cushion S121 (buttocks support portion), and therefore, deterioration of the seating comfort due to the connector is appropriately suppressed.

[0286] <<<When the recess 1212b has the protrusion 1212c>>> 43 and 44, the recess 1212b of the seat cushion pad 1210 may have a protrusion 1212c. Specifically, it is preferable that the protrusion 1212c protruding rearward is formed below the recess 1212b. With this configuration, the connector 1223 housed in the recess 1212b is supported from below by the protrusion 1212c, thereby making the state in which the connector 1223 is housed in the recess 1212b even more stable.

[0287] 44, it is preferable that the width L2 of the protrusion 1212c is smaller than the width L1 of the recess 1212b in the width direction of the seat cushion S121 (sitting portion). With this configuration, the small width L2 of the protrusion 1212c reduces the influence on the routing of the conductive part 1224 (harness), and it becomes possible to properly arrange the conductive part 1224 in the recess 1212b.

[0288] <<Modifications>> The present invention is not limited to the above-described embodiment. For example, in the above-described embodiment, the sensor member 1220 is provided in the seat cushion S121, but it may be provided in the seat back S122. Specifically, the detection unit 1221 may be disposed on the seating surface side of the seat back S122, and a recess for accommodating the connector 1223 may be formed in the lower end (end) of a seat back pad (not shown).

[0289] In the above embodiment, the recess 1212b is provided in the rear end 1212 of the seat cushion pad 1210. It is possible to provide a recess for accommodating a connector in an end other than the rear end 1212, that is, in the front end 1211 or the side end 1213 of the seat cushion pad 1210, as long as the end avoids a position where a load from a seated person is applied in the seat cushion S121 as a seating portion.

[0290] A seat cushion pad 1210A according to a modified example will be described below with reference to Fig. 45 and Fig. 46. Fig. 45 is a top view showing the seat cushion pad 1210A according to the modified example, and Fig. 46 is a cross-sectional view taken along line BB in Fig. 45. In the following description, only parts different from the above embodiment will be described.

[0291] The through-hole 1214A provided in the seat cushion pad 1210A according to the modified example has a connector insertion portion 1214Aa at the rear for passing the connector 1223 therethrough, and a slit 1214Ab at the front. The connector insertion portion 1214Aa is for inserting the connector 1223 and the conductive portion 1224 from above to below the seat cushion pad 1210A when arranging the sensor member 1220 during assembly, and is configured to be sized so that the connector 1223 can be inserted therethrough.

[0292] 46, the conductive portion 1224 of the sensor member 1220 is inserted into the slit 1214Ab. Specifically, the conductive portion 1224 extending rearward from the detection portion 1221 is inserted into the slit 1214Ab formed in the through-hole 1214A of the seat cushion pad 1210A and bent downward.

[0293] Depending on the position of the through-hole 1214A in the seat cushion pad 1210A (pad member), the conductive portion 1224 of the sensor member 1220 may bend into a Z-shape, but by arranging the conductive portion 1224 in the slit 1214Ab of the through-hole 1214A, the fixation of the conductive portion 1224 inside the through-hole 1214A is improved.

[0294] At this time, the slit 1214Ab extends in the width direction of the seat cushion S121 (sitting portion), making it easy to arrange the conductive portion 1224 of the sensor member 1220 in the slit 1214Ab.

[0295] The seat cushion S121 (sitting portion) is a buttocks support portion that supports the buttocks of a seated person, and the through-hole 1214A is disposed on the side closer to the rear end portion 1212A of the seat cushion pad 1210A, and the slit 1214Ab is disposed on the front side of the through-hole 1214A. In this configuration, the conductive portion 1224 extending from the detection portion 1221 disposed in the seating area can be disposed in the slit 1214Ab and guided rearward.

[0296] In addition, it is preferable that the slit 1214Ab is formed narrower than the through-hole 1214A in the front-rear direction of the seat cushion S121 (sitting portion). In such a configuration, the seat cushion pad 1210A sandwiches the conductive portion 1224 of the sensor member 1220 in the front-rear direction in the slit 1214Ab, thereby making it possible to properly fix the sensor member 1220.

[0297] The position of the slit 1214Ab in the through hole 1214A is not limited to the above example, and the slit 1214Ab may be disposed on the side or rear of the through hole 1214A. Also, multiple slits 1214Ab may be formed in the through hole 1214A depending on the number of conductive portions 1224.

[0298] The chair according to the present embodiment has been described above using a vehicle seat (vehicle seat) as an example. The chair according to the present embodiment is not particularly limited as long as the seating portion has a sensor member, a pad member, and a cover material, but is preferably a vehicle seat to be mounted on a vehicle. The chair according to the present embodiment allows the sensor member to be appropriately positioned even when it is a vehicle seat to be mounted on a vehicle with limited space.

[0299] The chair according to this embodiment is not particularly limited in its use as long as the seating portion has a sensor member, a pad member, and a cover material. For example, the chair of the present invention can be used as an office chair used indoors other than in vehicles.

[0300] According to the chair of the present invention, a recess for accommodating a connector is provided at the end of the seating area, avoiding the position where the weight of the seated person is applied, and is covered with a skin material, thereby preventing the connector from reducing the seating comfort and preventing the connector from falling off. Furthermore, according to the chair of the present invention, by providing a recess in the protruding portion on the seating surface side, the connector can be stably accommodated in the recess. Furthermore, according to the chair of the present invention, the connector is housed in the recess of the bulge formed at the rear end of the buttocks support portion, which prevents the connector from reducing the seating comfort. Furthermore, according to the chair of the present invention, the connector housed in the recess is supported from below by the protrusion, so that the state in which the connector is housed in the recess becomes even more stable. Furthermore, according to the chair of the present invention, the small width of the protrusions reduces the influence on the routing of the conductive parts, making it possible to properly position the conductive parts. Furthermore, according to the chair of the present invention, depending on the position of the through hole in the pad member, the conductive portion of the sensor member may bend into a Z-shape, but by arranging the conductive portion in the slit of the through hole, the fixation of the conductive portion within the through hole is improved. Furthermore, according to the chair of the present invention, it is easy to arrange the conductive portion of the sensor member in the slit. Furthermore, according to the chair of the present invention, the conductive portion extending from the detection portion arranged in the seating area can be arranged in the slit and guided rearward. Furthermore, according to the chair of the present invention, the pad member sandwiches the conductive portion of the sensor member from the front and rear directions in the slit, thereby making it possible to properly fix the sensor member. Furthermore, according to the chair of the present invention, even when the chair is used as a vehicle seat to be installed in a vehicle where space is limited, it is possible to appropriately arrange the sensor member. [Explanation of symbols]

[0301] 1 seat frame 2 rotating shafts 3 Slide mechanism 4 Height adjustment mechanism 10 Seat cushion frame 11 Cushion side frame 12 Pan Frame 13 Rear pipe 14 Elastic Spring 20, 20B seat back frame 21 Backside Frame 22 Upper frame 23 Lower frame 24 horizontal connecting frame 25 Vertically Connected Frame 26 Wire material 27 Pillar mounting member 30, 30A Shoulder Support 31 Shoulder support plate 32 Shoulder fluid bag (first movable body) 32A Inner Shoulder Fluid Bag 32B Outer Shoulder Fluid Bag 32a First shoulder fluid bag 32b Second shoulder fluid bag 32c Third shoulder fluid bag 33 Mounting material 34 biasing member 34a Plate 34b Rotating shaft 34c fluid bag 35 Lumbar support 36 Lumbar support plate 37 Waist fluid bag (second movable body) 40 Weight Sensor 41 Vehicle speed sensor 42 Steering angle sensor 43 Pressure Sensor 44 Expansion pressure sensor 45 Rotation angle sensor 50 ECU (control unit) 51 Acquisition Department 52 Judgment section 53 Drive unit 55 Actuator 56 Solenoid valve 57 Heater 58 Vibration device S1 Vehicle seats (vehicle seats) S11 seat cushion S11a seat cushion pad S11b Skin material S12 seat back S12a seat back pad S12b skin material S13 headrest S13a headrest pad S13b Skin material S13c Pillar 201 Seat frame 202 Rotating shaft 210 seat cushion frame 220 seat back frame 221 Backside Frame 221a Lower side frame 221b Connecting frame (upper side frame) 222 Upper Frame 222a Vertical section (upper side frame) 222b Horizontal section (upper frame) 223 Lower Frame 224 Horizontal connecting frame 225 Vertically Connected Frame 226 Wire material 227 Folding shaft 228 long hole 230 Shoulder support 235 Lumbar support (lower back support) 245 Rotational Angle Sensor 246 Center bending angle sensor 250 ECU 251 Acquisition Department 252 Judgment section 253 Drive Unit 260 Drive Mechanism 261 Actuator 261a Lifting rod 262 Link member 263 First connecting member 264 Second connecting member 320 seat back frame 321 Backside Frame 322 Upper Frame 323 Lower Frame 323a Mounting hole 324 Horizontally Connected Frame 324a Lower flange 324b Support hole 330 Shoulder Support 332 Shoulder fluid bag 335 Lumbar Support 350 ECU 360 Support Device 361 Pressure-receiving member 361a central part 361b Side 361c Mounting hook 362 Support member 363 Support Wire 364 Upper fixing plate 364a Upper fixing plate body 364b Horizontal support pipe 364c Vertical support pipe 365 Guidewire 366 Lower fixing plate 366a protrusion 366b Through hole 367 First movable plate 367a Guided part 368 Second movable plate 368a Guided part 369 Third movable plate 369a Guided part 370 Lifting mechanism 371 Screw shaft 371a First screw shaft 371b Second screw shaft 371c Third screw shaft 372 Motor 372a First Motor 372b Second motor 372c Third Motor 373 Transmission Components 373a First transmission member 373b Second transmission member 373c Third transmission member 374 Fixing member 374a First upper fixing member 374b First lower fixing member 374c Second upper fixing member 374d Third upper fixing member 420 seat back frame 421 Backside Frame 422 Upper Frame 423 Lower Frame 424 Pressure-receiving member 424a Upper part 424b central part 424c lower part 425 Support Wire 430 Shoulder Support 435 Lumbar Support 460 Side Support 462 Lateral fluid bag (third movable body) S401 Vehicle seats (vehicle seats) S411 seat cushion S412 seat back S412b Skin material S413 Headrest 510 seat cushion frame 511 Cushion side frame 512 Pan Frame 513 front pipe 514 rear pipe 520 Pressure-receiving member 521 Wire 522 Front pressure plate 523 Central pressure plate 523b Through hole 523c Slit 524 Rear pressure plate 524b Main body 524c Slope 524d Rib 524e Through hole 530 Support member 531 First part 532 Second part 533 Third part 534 Fourth part 535 Connecting part 540 Femoral fluid bag 550 ECU 610 Seat cushion frame 640 Femoral fluid bag 710 seat cushion frame 740 biasing member 741 Torsion Spring 742 Support Plate 743 Femoral fluid bag 744 Elastic Rotating Body 744a Protrusion 750 ECU 810 seat cushion frame 811 Cushion Side Frame 812 Fixed Pan Frame 812a Side member 812b front member 812c Plate-shaped part 812e front wall 812f rear wall 812g side wall 812h bottom wall 812k box body 812l Reinforcement part 812m aft flange 813 Movable Pan Frame 813a Upper board 813b Front panel 813c Pressure Plate 813d long hole 813e Fixed part 814 Front Pipe 815 rear pipe 816 Fastening members 820 Length adjustment mechanism 821 First Actuator 821a First fluid bag 822 Second Actuator 822a Second fluid bag 823 Compressor 824 First control valve 825 First connecting pipe 826 Second control valve 827 Second connecting pipe 828 Operation switch 850 ECU 911 seat cushion pad 912 Pad body 912a central part 912b Side 912c Cover mounting part 912d First engaging part 912e Second engaging part 920 First cover member 920a Engaged part 920b Ventilation hole 921 Second cover member 921a Engaged part 921b Seat sensor mounting part 930 Skin material 941 Ventilation duct 942 Inlet 943 Air outlet 945 Seat Sensor 946 Control Circuit 947 Harness 960 Fluid bag 960a Femoral fluid bag 960b Lumbar fluid bag 960c Side Fluid Bladder S901 Vehicle seats (vehicle seats) S911 seat cushion S912 seat back S913 Headrest 1010 seat cushion frame 1046 External Sensor 1047 Collision Sensor 1050 ECU 1051 Acquisition Department 1052 Judgment section 1052a Collision prediction unit 1052b Collision determination section 1060 fluid bag 1061 Buttock fluid bag 1062 Femoral fluid bag 1063 Lumbar fluid bag 1064 Side fluid bag 1070 Airbag device 1071 Airbag body 1071a Anterior part 1071b Posterior part 1072 Inner Bag 1072a Discharge hole 1073 Gas Generator S1001 Vehicle seats (vehicle seats) S1011 seat cushion S1011a Seat cushion pad S1011b Skin material S1012 seat back S1013 Headrest 1120 Pad 1130 Skin material 1131 Quilting Patterns 1132 convex part 1133 recess 1140 Fluid bag 1141 First fluid bag 1142 Second fluid bag S1101 Vehicle seats (vehicle seats) S1111 seat cushion S1112 seat back S1113 Headrest 1210, 1210A Seat cushion pad (pad material) 1210a surface 1210b back side 1211 Front end (first end) 1212, 1212A rear end (second end, end) 1212a Bulge 1212b Recess 1212c Convex part 1213 Side edge 1214, 1214A through hole 1214Aa Connector insertion part 1214Ab Slit 1220 Sensor material 1221 Detector 1222 External Output Unit 1223 Connector 1224 Conductive parts (harnesses, wiring components) 1224a First bend 1224b Second bend 1230 Trim cover (skin material) S1201 Vehicle seats (vehicle seats) S1211 Seat cushion (seating area) S1212 Seat back (seating area) S1213 Headrest

Claims

1. A vehicle seat including a seat back frame, a skin covering the seat back frame, a movable body disposed between the seat back frame and the skin and protruding forward relative to the seat back frame, and a control device for controlling movement of the movable body, The movable body is left and right first movable bodies disposed in an upper portion of the seat back frame; a second movable body disposed below the first movable body in the seat back frame, The vehicle seat, wherein the control device controls the amount of protrusion of either the first movable body or the second movable body based on the amount of protrusion of the other.

2. the first movable body is a shoulder movable body that supports a shoulder of an occupant, the second movable body is a waist movable body that supports a waist of an occupant, 2. The vehicle seat according to claim 1, wherein the control device, when controlling the protruding movements of the shoulder movable bodies and the waist movable bodies, controls the protruding amount of the other of the shoulder movable bodies to be smaller when the protruding amount of either the shoulder movable bodies or the waist movable bodies is large.

3. The movable body has an inflatable and deflate bag body, 2. The vehicle seat according to claim 1, wherein the control device acquires a pressure signal related to the pressure applied to the bag body, and controls the bag body to limit the amount of protrusion based on the pressure signal.

4. 2. The vehicle seat according to claim 1, wherein the control device acquires a steering angle signal relating to a steering angle of the vehicle, and controls the amount of protrusion of the movable body in real time based on the steering angle signal.

5. The first movable body is 2. The vehicle seat according to claim 1, further comprising an inner first movable body disposed on both the left and right sides of the seat back frame in the seat width direction, and left and right outer first movable bodies disposed at outer positions in the seat width direction of the inner first movable body.

6. The seat back frame is left and right lower side frames extending in the up-down direction; left and right upper side frames attached to upper ends of the left and right lower side frames, respectively, and rotatable in the front-rear direction relative to the lower side frames; an upper frame connecting the upper side frames; The vehicle seat according to claim 1, wherein the first movable body is disposed at a position sandwiched between the left and right upper side frames in the seat width direction.

7. The vehicle seat includes a seat cushion frame, the seatback frame is attached to a rear end of the seat cushion frame and is rotatable in the front-rear direction relative to the seat cushion frame, 7. The vehicle seat according to claim 6, wherein the control device acquires a first rotation angle signal relating to a rotation angle of the seat back frame relative to the seat cushion frame and a second rotation angle signal relating to a rotation angle of the upper side frame relative to the lower side frame, and controls the protrusion amount of the movable body based on the first rotation angle signal and the second rotation angle signal.

8. The vehicle seat includes:

2. The vehicle seat according to claim 1, further comprising a lifting mechanism that supports the first movable body so that the first movable body can be raised and lowered in the vertical direction relative to the seatback frame.

9. the lifting mechanism supports the second movable body relative to the seat back frame so as to be able to lift and lower the second movable body in the up and down direction; The vehicle seat according to claim 8, wherein the control device controls the lifting mechanism to raise and lower the first movable body in accordance with the vertical position of the second movable body.

10. the movable body includes left and right third movable bodies disposed between the first movable body and the second movable body in the up-down direction of the seatback frame, the third movable body has a plurality of inflatable and deflate bags, 2. The vehicle seat according to claim 1, wherein the plurality of bags are stacked, have different sizes, and are arranged in different directions.

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