JP7428553B2 - vehicle seat - Google Patents

Description

The present invention relates to a vehicle seat provided with a vital sensor.

The vehicle seat described in Patent Document 1 below includes a seat pan that supports a seat cushion, and a seat frame that fixes both left and right ends of the seat pan to a vehicle body. The seat pan is formed in a planar shape along the lower surface of the seat cushion, and includes a mounting surface portion to which a vital sensor for detecting the occupant's biological information is attached, and a front-rearward extension outside the mounting surface portion in the left-right direction. The deformed portion has a V-shaped cross section with the portion facing upward or downward. The above-mentioned vital sensor is a radio wave sensor that detects body surface displacement due to pulsation or breathing of an occupant, for example, from reflected waves of radio waves emitted towards the occupant.

In this vehicle seat, when a load in the left and right directions is input to the seat pan during a side collision of the vehicle, the deformable portion absorbs the load by compressing and deforming in the left and right direction. This suppresses crushing deformation and tilting deformation of the mounting surface portion to which the vital sensor is attached, and suppresses movement of the attachment position of the vital sensor, thereby suppressing a decrease in detection accuracy of the vital sensor.

JP2016-68841A

In the above-mentioned prior art, the installation position of the vital sensor (radio wave sensor) is set slightly behind the center of the seat pan in the longitudinal direction and at the center in the left and right direction, so the radio wave sensor is installed directly below the waist and buttocks of the occupant. A sensor will be placed. Since the lower back and buttocks move up and down due to vertical vibrations when the vehicle is running, the distance between the lower back and buttocks and the radio wave sensor changes significantly, causing a decrease in the detection accuracy of body surface displacement by the radio wave sensor.

The present invention has been made in consideration of the above facts, and an object of the present invention is to obtain a vehicle seat that can improve the detection accuracy of body surface displacement by a radio wave sensor compared to the conventional one.

The vehicle seat according to the first aspect includes a seat cushion that supports the buttocks and thighs of an occupant, a seat back that supports the back of the occupant, and a seat back that is located diagonally below the back of the seat with respect to the lumbar region of the occupant. At least one of a back radio wave type sensor disposed at a lower end portion and a cushion radio wave type sensor disposed at a rear end portion of the seat cushion on the diagonally downward rear side of the seat with respect to the buttocks of the occupant. ing.

The vehicle seat of the first aspect includes at least one of a back radio wave sensor and a cushion radio wave sensor. The back radio wave sensor is arranged at the lower end of the seat back on the diagonally lower side of the rear of the seat with respect to the occupant's waist, and the cushion radio wave sensor is arranged on the rear end of the seat cushion on the diagonally lower side of the rear of the seat with respect to the occupant's buttocks. will be established. This reduces the distance between at least one of the radio wave sensors and the waist and buttocks when the waist and buttocks vibrate up and down, compared to a case where the radio wave sensor is disposed directly below the waist and buttocks of the occupant. Changes become smaller. Therefore, the detection accuracy of body surface displacement by the radio wave sensor can be improved compared to the conventional method.

In the vehicle seat of the second aspect , in the vehicle seat of the first aspect , the seat back extends in the left-right direction of the seat at a lower end portion of the seat back, and constitutes a part of the frame of the seat back. The vehicle has a lower back panel, and the back radio wave sensor is attached to the lower back panel.

In the vehicle seat of the second aspect , a back radio wave sensor is attached to a lower back panel extending in the left-right direction of the seat at the lower end of the seat back. Since this lower back panel constitutes a part of the frame of the seat back, it is possible to prevent the back radio wave sensor from being inadvertently displaced.

In the vehicle seat of a third aspect , in the vehicle seat of the second aspect , the seat back is disposed diagonally above the front of the seat with respect to the lower back panel, and supports the lumbar region of the occupant from the rear side of the seat. The back radio wave sensor includes a lumbar support plate, and a reclining rod that is disposed below the lumbar support plate and in front of the seat with respect to the lower back panel and extends in the left-right direction of the seat. It is arranged below the seat relative to the lumbar support plate and above the seat above the reclining rod.

In the vehicle seat of the third aspect , the back radio wave sensor attached to the lower back panel of the seat back is arranged below the lumbar support plate and above the reclining rod. Thereby, it is possible to prevent or suppress the radio waves transmitted from the back radio wave sensor toward the occupant from interfering with the lumbar support plate and the reclining rod.

A vehicle seat according to a fourth aspect is the vehicle seat according to any one of the first to third aspects , wherein the seat cushion extends in the left-right direction of the seat at a rear end portion of the seat cushion. The seat cushion has a rear frame that constitutes a part of the frame of the seat cushion, and the cushion radio wave sensor is disposed diagonally downward in front of the seat with respect to the rear frame.

In the vehicle seat of the fourth aspect , the cushion radio wave extends in the left-right direction of the seat at the rear end of the seat cushion, and is provided diagonally downward in front of the seat with respect to the rear frame that constitutes a part of the frame of the seat cushion. A type sensor is arranged. Since the position where this cushion radio wave type sensor is disposed is generally below the pad material of the seat cushion, there is no need to change the shape of the pad material of the seat cushion.

In the vehicle seat according to a fifth aspect , in the vehicle seat according to the fourth aspect , the seat cushion includes a plurality of cushions arranged side by side in the left-right direction of the seat, each rear end portion of which is locked to the rear frame. It has a spring, and the cushion radio wave sensor is supported by one or more of the cushion springs.

In the vehicle seat of the fifth aspect , the seat cushion has a plurality of cushion springs that are arranged side by side in the left-right direction of the seat and whose respective rear ends are locked to the rear frame. A cushion radio wave sensor is supported by one or more of them. This eliminates the need to provide a special bracket or the like on the rear frame or the like to support the cushion radio wave sensor.

A vehicle seat according to a sixth aspect is the vehicle seat according to the fifth aspect , including a connecting member that connects the rear end portions of the plurality of cushion springs in the left-right direction of the seat, and the cushion radio wave sensor is configured to Attached to the connecting member.

In the vehicle seat of the sixth aspect , the rear end portions of the plurality of cushion springs are connected in the left-right direction of the seat by the connecting member. This makes it easier to distribute the load from the occupant to the plurality of cushion springs, thereby stabilizing the support of the occupant's buttocks by the seat cushion. Since this connecting member is also used for attaching the cushion radio wave sensor, the configuration can be simplified.

A vehicle seat according to a seventh aspect is a vehicle seat according to any one of the first to sixth aspects , in which at least one of the at least one of the seat cushion and the seat back is located at the center of the seat cushion and the seat back in the lateral direction of the seat. In contrast, the seat is shifted in the left-right direction.

In the vehicle seat of the seventh aspect , at least one of the back radio wave type sensor and the cushion radio wave type sensor is disposed offset in the seat left and right direction with respect to the center of the seat cushion and the seat back in the seat left and right direction. As a result, at least one of the radio wave sensors is disposed offset in the left-right direction of the occupant with respect to the center in the left-right direction of the waist and buttocks of the occupant. The skin is thinner in the lateral center of the lower back and buttocks, where the lumbar vertebrae and sacrum are located, whereas the skin is thicker in areas that are offset laterally from the lateral center of the lower back and buttocks. . Therefore, by arranging at least one of the radio wave sensors shifted as described above, it becomes easier to detect the displacement of the occupant's body surface.

As described above, in the vehicle seat according to the present invention, the detection accuracy of body surface displacement by the radio wave sensor can be improved compared to the conventional one.

FIG. 1 is a perspective view showing a vehicle seat according to an embodiment. FIG. 2 is an enlarged perspective view of a part of the configuration shown in FIG. 1; FIG. 2 is a side view showing a state in which an occupant is seated on the vehicle seat according to the embodiment. FIG. 2 is a side view showing the pelvis and surrounding area of an occupant seated on a vehicle seat. FIG. 3 is a front view showing an occupant sitting on a vehicle seat. FIG. 3 is a perspective view showing a frame of a seat back used when comparing heart rate detection accuracy using radio wave sensors arranged at different positions. It is a graph for demonstrating the comparison method of the detection accuracy of the said heart rate. It is a graph which shows the comparison result of the detection accuracy of the said heart rate. FIG. 3 is a perspective view corresponding to FIG. 2 showing a modification of the embodiment.

Hereinafter, a vehicle seat 10 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3. Note that in each figure, some symbols may be omitted to make the drawings easier to read. Further, arrows FR, LH, and UP shown as appropriate in each figure indicate the front, left, and upper sides of the vehicle seat 10, respectively. Hereinafter, when the directions are simply referred to as front, rear, left, right, up and down, the directions with respect to the vehicle seat 10 are indicated unless otherwise specified.

(composition)
As shown in FIGS. 1 to 3, the vehicle seat 10 according to the present embodiment includes a seat cushion that supports the buttocks H and thighs F of an occupant P (see FIG. 3) seated on the vehicle seat 10. 12, a seat back 34 that supports the back B of the occupant P, and a headrest 54 that supports the head H of the occupant P. Furthermore, this vehicle seat 10 includes a back radio wave sensor 70 disposed at the lower end of the seat back 34 on the rear diagonally downward side with respect to the waist W of the occupant P, and a rear diagonally downward side with respect to the buttocks H of the occupant P. A cushion radio wave type sensor 72 is provided at the rear end of the seat cushion 12 on the side.

It is assumed that the above-mentioned occupant P is, for example, a dummy doll of AM50 (50th percentile of American adult males) of Hybrid-3, and is seated on the vehicle seat 10 in a normal sitting position. The waist W of the occupant P is a part of the dividing line that divides the resin member corresponding to the skin into upper and lower parts in the torso of the dummy doll, and if the occupant P is a living human being, the ribs and pelvis This is the part between. Further, in this embodiment, the front, rear, left, right, top, and bottom directions of the vehicle seat 10 match the front, rear, left, right, top, and bottom directions of the vehicle in which the vehicle seat 10 is mounted. Hereinafter, first, an outline of the overall configuration of the seat cushion 12 and the seat back 34 will be explained, and then main parts of the present embodiment will be explained.

(Overall composition of seat cushion)
As shown in FIG. 1, the seat cushion 12 includes a cushion frame 14 that is a frame (skeleton), a cushion pad (not shown) that is a pad material supported by the cushion frame 14, and a skin material that covers the cushion pad. It has a cushion skin 32. The cushion frame 14 includes a pair of left and right side frames 16 that extend in the front-rear direction on the left and right sides of the seat cushion 12, and a front frame 18 that spans between the upper end portions of the front portions of the left and right side frames 16. It includes a rear frame 20 spanning between the rear end portions of the left and right side frames 16.

The left and right side frames 16 are formed into elongated shapes, for example, from sheet metal, and are arranged with their longitudinal direction along the front-rear direction and their thickness direction along the left-right direction. These side frames 16 are connected to the floor of the vehicle body via a lifter mechanism 22 and a slide mechanism 24. The slide mechanism 24 is for adjusting the position of the vehicle seat 10 in the longitudinal direction with respect to the floor VF of the vehicle (see FIG. 3), and includes left and right slide rails 26. The lifter mechanism 22 is for adjusting the vertical position of the seat cushion 12 with respect to the floor VF.

The front frame 18 is formed, for example, into a substantially rectangular shape by sheet metal, and is arranged with the thickness direction along the vertical direction, and both ends in the left and right direction are attached to the front parts of the left and right side frames 16 by means such as welding. Fixed. The rear frame 20 is formed of a metal pipe, is arranged with its axial direction along the left-right direction, and both ends of the rear frame 20 in the left-right direction are rotatably connected to the rear ends of the left and right side frames 16. . This rear frame 20 constitutes a part of the lifter mechanism 22, and is configured to rotate around an axis when the lifter mechanism 22 is operated.

A plurality of (here, four) cushion springs 28 are bridged between the rear frame 20 and the front frame 18. These cushion springs 28 are so-called S springs, and are arranged side by side in the left-right direction, and each front end (not shown) is locked to the front frame 18. A rear end portion 28R of each cushion spring 28 is locked to the rear frame 20. Specifically, a hook portion 28R1 is formed on the rear end portion 28R of each cushion spring 28, and the hook portion 28R1 is bent into a substantially C-shape with an open diagonally lower front side when viewed in the left-right direction. It is hooked and locked to the rear frame 20 from the rear side.

Further, the rear end portion 28R of each cushion spring 28 is provided with an inclined portion 28R2 extending diagonally downward and forward from the hook portion 28R1. The inclined portions 28R2 of each cushion spring 28 are connected in the left-right direction by a connecting member 30. This connecting member 30 is formed into a long plate shape, for example, from a resin material, and is in a posture such that its longitudinal direction is along the left-right direction, and its width direction, which is perpendicular to the longitudinal direction and the plate thickness direction, is along each inclined portion 28R2. It is located in This connecting member 30 is fixed to each cushion spring 28 by means of claw fitting, screwing, etc., and has a function of distributing the load from the occupant P to the plurality of cushion springs 28.

The cushion pad is made of a foam such as urethane foam, and is attached to the cushion frame 14 from above. This cushion pad is supported from below by the cushion frame 14 and a plurality of cushion springs 28, and its rear end is also supported from below by the above-mentioned connecting member 28. In other words, the connecting member 28 also has the function of supporting the cushion pad from below. The cushion skin 32 covering the cushion pad is formed into a bag shape by sewing a plurality of cloth pieces made of, for example, cloth, leather, synthetic leather, PVC, or the like.

(Overall configuration of seat back)
As shown in FIG. 1, the seat back 34 includes a back frame 36 that is a frame (skeleton), a back pad (not shown) that is a pad material supported by the back frame, and a back pad that is a skin material that covers the back pad. It is configured to include an epidermis 66. The back frame 36 spans between a pair of left and right side frames 38 extending in the vertical direction (in the height direction of the seat back 34) on the left and right sides of the seat back 34, and the upper ends of the left and right side frames 38. the upper frame 40 (not shown), an upper back panel 42 fixed to the back side of the upper frame 40, and a lower back panel 44 fixed to the back sides of the lower ends of the left and right side frames 38. .

The left and right side frames 38 are formed into elongated shapes, for example, from sheet metal, and are arranged with their longitudinal direction along the up-down direction and their thickness direction along the left-right direction. The lower ends of the left and right side frames 16 are connected to the rear ends of the left and right side frames 16 of the cushion frame 14 via a reclining mechanism 46. The reclining mechanism 46 is for adjusting the reclining angle of the seat back 34 with respect to the seat cushion 12. The reclining mechanism 46 includes a reclining rod 48 extending in the left-right direction at the lower end of the seat back 34. The reclining rod 48 has a cylindrical shape with its axis extending in the left-right direction, and is spanned between the lower ends of the left and right side frames 38 .

The upper frame 40 is formed, for example, by bending a metal pipe into a substantially inverted U-shape, and includes a horizontally extending portion 40A extending in the left-right direction, and a horizontally extending portion 40A extending from both left-right ends of the horizontally extending portion 40A. It has a pair of left and right legs 40B extending downward. The left and right leg portions 40B are fixed to the upper end portions of the left and right side frames 38 by means such as welding, and a pair of left and right headrest support brackets 50 are fixed to the middle portion of the horizontally extending portion 40A in the left and right direction. . A headrest frame 56 that constitutes the frame of the headrest 54 is attached to these headrest support brackets 50 via a headrest support 52.

The upper back panel 42 is formed into a long shape by, for example, a sheet metal, and is arranged with the longitudinal direction along the left-right direction and the thickness direction along the front-back direction, and both longitudinal ends are welded to the left and right sides. is fixed to the back side of the leg portion 40B. The lower back panel 44 is formed in an elongated shape by, for example, a sheet metal, and is arranged with its longitudinal direction along the left-right direction and its thickness direction along the front-rear direction, and both longitudinal ends are welded to the left and right sides. is fixed to the rear side of the lower end of the side frame 16.

A lumbar support plate 58, which is part of the lumbar support 57, is arranged diagonally above the front of the seat with respect to the lower back panel 44. The lumbar support plate 58 is formed of, for example, a sheet metal into an elongated rectangular shape, and is disposed such that its longitudinal direction runs along the left-right direction and its thickness direction runs along the front-back direction. The lumbar support plate 58 is supported by the left and right side frames 38 via, for example, torsion bars (not shown), and is displaced in the front-rear direction by rotating the torsion bars manually or electrically. The lumbar support plate 58 is configured to support the lumbar region W of the occupant P from the rear side of the seat via the back pad and the back skin 66. The above-described reclining rod 48 is arranged below the lumbar support plate 58 and in front of the lower end of the lower back panel 44 .

Further, a spring mat 60 is spanned between the lumbar support plate 58 and the upper back panel 42. The spring mat 60 is also called a flat mat, and is arranged between the left and right side frames 38. The spring mat 60 includes a pair of left and right side wires 62 that span between the upper back panel 42 and the lumbar support plate 58, and a plurality of main wires 64 that span between the left and right side wires 62. are doing.

The back pad is made of a foam such as urethane foam, and is attached to the back frame 36 from above. This back pad is supported from the rear side by a back frame 36, a lumbar support plate 58, and a spring mat 60. The back skin 66 that covers the back pad is formed into a bag shape by sewing a plurality of cloth pieces made of, for example, cloth, leather, synthetic leather, PVC, or the like.

(Main part of this embodiment)
As described above, the vehicle seat 10 according to the present embodiment includes the back radio wave sensor 70 disposed at the lower end of the seat back 34 on the rear diagonally lower side (rear side and lower side) with respect to the waist W of the occupant P. and a cushion radio wave type sensor 72 disposed at the rear end of the seat cushion 12 on the rear diagonally lower side (rear side and lower side) with respect to the buttocks H of the occupant P.

The back radio wave sensor 70 is disposed at the lower end of the seat back 34 at the center in the left-right direction. Specifically, the back radio wave sensor 70 is attached to the front side of the lower back panel 44, which is a part of the back frame 36, at the center in the left-right direction using screws or the like, and is located below the lumbar support plate 58. It is arranged on the side and above the reclining rod 48. The back radio wave sensor 70 is a non-contact vital sensor (radio wave heart rate sensor).

The cushion radio wave sensor 72 is disposed at the rear end of the seat cushion 12 at the center in the left-right direction. Specifically, the cushion radio wave sensor 72 is disposed diagonally downward in front of the rear frame, which is a part of the cushion frame 14, and in the center in the left-right direction. It is supported by the rear end portion 28R of the spring 28. A rectangular opening 31 is formed in the center of the connecting member 30 in the left-right direction, and a cushion radio wave sensor 72 is arranged inside the opening 31. The cushion radio wave sensor 72 is attached to the connecting member 30 by screws or the like, and is disposed facing or in contact with the lower surface of the rear end of the cushion pad from below. This cushion radio wave sensor 72 is a non-contact vital sensor (radio wave heart rate sensor).

The back radio wave sensor 70 and the cushion radio wave sensor 72 are electrically connected to, for example, a control device (not shown) mounted on the vehicle. This control device is configured to perform various controls of the vehicle based on the detection results of the back radio wave sensor 70 and the cushion radio wave sensor 72. Examples of the above-mentioned control include operation control of a vibration device mounted on the vehicle seat 10, operation control of a vehicle air conditioner, and operation control of a sound device. This acoustic device is used, for example, for audio warnings.

(action and effect)
Next, the functions and effects of this embodiment will be explained.

The vehicle seat 10 configured as described above includes a back radio wave sensor 70 and a cushion radio wave sensor 72. The back radio wave sensor 70 is disposed at the lower end of the seat back 34 on the rear diagonally downward side of the seat with respect to the waist W of the occupant P, and the cushion radio wave sensor 72 is disposed on the diagonally downward rear side of the seat with respect to the buttocks H of the occupant P. and is arranged at the rear end of the seat cushion 12. As a result, when the waist W and the buttocks H vibrate up and down, the radio wave sensors 70 and 72 and the waist Changes in distance between W and buttocks H become smaller. Therefore, the accuracy of detecting body surface displacement by each of the radio wave sensors 70 and 72 can be improved compared to the prior art.

In particular, the back radio wave sensors 70 are arranged so as to face each other in the front-rear direction with respect to the region near the sacrum of the occupant P, so that the back up and down vibrations of the body of the occupant P when the vehicle is traveling on a rough road can be avoided. The distance between the above-mentioned parts is difficult to change due to the influence of left and right shaking. Therefore, the body surface displacement of the occupant P can be stably detected (measured) regardless of the road surface condition.

The above effects will be supplementarily explained using FIGS. 4 to 7. FIG. 4 shows a side view of the periphery of the pelvis PE of the occupant P seated on the vehicle seat. Note that in FIGS. 4 to 6, the same components as those in this embodiment are given the same reference numerals.

While the occupant P is seated, most of the load of the occupant P is received by the seat surface of the seat cushion 12, and as shown in FIG. The body is supported. Therefore, as shown in FIG. 5, when the body of the occupant P swings in the left-right direction, the chest C of the upper part of the body away from the above-mentioned support point SP moves significantly in the left-right direction (see FIG. (see arrow A1 in FIG. 5), and the movement of the waist W, buttocks H, etc. at the support point SP is small (see arrow A2 in FIG. 5). Therefore, by detecting body surface displacement in areas where body movement is relatively small, such as the waist W and buttocks H, using the radio wave sensors 70 and 72, it is possible to suppress a decrease in detection accuracy for the same vehicle behavior.

FIG. 6 shows the back frame 36 used in the tests conducted by the inventor of the present application. In this test, a radio wave sensor 70A attached to the upper back panel 42 at the top of the back frame 36 and a radio wave sensor 70B attached to the lower back panel 44 were used to evaluate the detection accuracy of the heart rate of a seated occupant. compared. In this comparison, the heart rate measured using an electrocardiograph is used as the standard (100%), and the heart rate measured by each radio wave sensor 70A, 70B is within a range of ±3 bpm with respect to the standard heart rate. The percentage of data was examined. In other words, as shown in FIG. 7A, among the heart rates measured by radio sensors (radio sensors 70A and 70B), data within a range of ±3 bpm with respect to the standard heart rate is considered OK, while data outside the range is considered OK. The data were determined to be NG, and the percentage of OK data was investigated. As a result, the graph shown in FIG. 7B was obtained. As shown in FIG. 7B, the radio wave sensor 70B attached to the lower back panel 44, similar to the back radio sensor 70 according to the present embodiment, is compared with the radio wave sensor 70A attached to the upper back panel 42. A heart rate close to the standard was detected. As a result, it was confirmed that the detection accuracy of body surface displacement is improved in this embodiment.

Further, the back radio wave sensor 70 is attached to a lower back panel 44 extending in the left-right direction at the lower end of the seat back 34. Since this lower back panel 44 constitutes a part of the back frame 36, it is possible to prevent the back radio wave type sensor 70 from being inadvertently displaced.

Furthermore, the back radio wave sensor 70 is arranged below the lumbar support plate 58 and above the reclining rod 48. Thereby, the radio waves transmitted from the back radio wave sensor 70 toward the occupant P can be prevented or suppressed from interfering with the lumbar support plate 58 and the reclining rod 48.

In addition, in this embodiment, a rear frame 20 that constitutes a part of the cushion frame 14 extends in the left-right direction at the rear end of the seat cushion 12, and a rear frame 20 that forms a part of the cushion frame 14 extends in the left-right direction. A cushion radio wave sensor 72 is disposed at. Since the position where this cushion radio wave type sensor 72 is arranged is below the cushion pad which is the padding material of the seat cushion 12, there is no need to change the shape of the cushion pad.

In other words, in a configuration where a radio wave sensor is attached to the seat pan, such as the vehicle seat explained in the background technology section, the shape of the cushion pad needs to be changed to accommodate the sensor, so new designs and molds are required. Development costs due to design will increase. Furthermore, the upper and lower thicknesses of the cushion pad become thinner at the sensor mounting location, which causes a worsening of riding comfort for the occupant, but this embodiment can avoid the above-mentioned problem.

Furthermore, in this embodiment, the seat cushion 12 includes a plurality of cushion springs 28 that are arranged side by side in the left-right direction and each rear end portion 28R is locked to the rear frame 20. The rear end portions 28R of the plurality of cushion springs 28 are connected in the left-right direction by a connecting member 30, and the cushion radio wave type sensor 72 is supported by the plurality of cushion springs 28 via the connecting member 30. This eliminates the need to provide a special bracket or the like on the rear frame 20 or the like to support the cushion radio wave sensor 72.

Further, since the rear end portions 28R of the plurality of cushion springs 28 are connected in the left-right direction of the seat by the connection member 30, the load from the occupant P is easily distributed to the plurality of cushion springs 28. . Moreover, since the rear end of the cushion pad is supported by the connecting member 30, the support of the rear end of the cushion pad is stabilized. These things stabilize the support of the buttocks H of the occupant P by the seat cushion 12. Since this connecting member 30 is also used for attaching the cushion radio wave sensor 72, the configuration can be simplified.

In the above embodiment, the cushion radio wave sensor 72 and the back radio wave sensor 70 are arranged at the center of the seat cushion 12 and the seat back 34 in the left-right direction, but the present invention is not limited to this. That is, as in the modification shown in FIG. 8, the cushion radio wave sensor 72 and the back radio wave sensor 70 are arranged shifted in the seat left and right direction with respect to the center of the seat cushion 12 and the seat back 34 in the left and right direction. It may be configured. As a result, each of the radio wave sensors 70 and 72 is disposed offset in the left-right direction of the occupant P with respect to the center of the waist W and buttocks H of the occupant P in the left-right direction. The lateral center of the lumbar region W and the buttocks H is where the lumbar vertebrae and sacrum exist, and the skin is thin, whereas the skin is thinner in the lateral center of the lumbar region W and the buttocks H, where the skin is thinner. It's getting thicker. Therefore, by arranging the radio wave sensors 70 and 72 so as to be offset as described above, it becomes easier to detect the body surface displacement of the occupant P.

Further, although the vehicle seat 10 according to the above embodiment is configured to include both the cushion radio wave sensor 72 and the back radio wave sensor 70, the present invention is not limited to this. A configuration may be adopted in which one of the cushion radio wave sensor 72 and the back radio wave sensor 70 is not provided.

Further, in the above embodiment, the back radio wave sensor 70 is attached to the lower back panel 44, but the present invention is not limited to this. For example, the back radio wave sensor 70 may be attached to one of the left and right side frames 38 via a bracket or the like.

Further, in the above embodiment, the cushion radio wave sensor 72 is supported by the cushion spring 28 via the connecting member 30, but the present invention is not limited to this. For example, the cushion radio wave sensor 72 may be supported by the rear frame 20 via a bracket or the like.

In addition, the present invention can be implemented with various modifications without departing from the gist thereof. Moreover, it goes without saying that the scope of the rights of the present invention is not limited to the above embodiments.

10 Vehicle seat 12 Seat cushion 14 Cushion frame (frame of seat cushion)
20 Rear frame 28 Cushion spring 28R Rear end portion 30 Connecting member 34 Seat back 36 Back frame (frame of seat back)
44 Lower back panel 48 Reclining rod 58 Lumbar support plate 70 Back radio wave sensor 72 Cushion radio wave sensor P Occupant H Buttocks F Thigh W Lumbar region

Claims (7)

a seat cushion that supports the buttocks and thighs of an occupant;
a seat back that supports the back of the occupant;
a cushion radio wave sensor disposed at the rear end of the seat cushion on the diagonally lower side of the rear of the seat with respect to the occupant's buttocks;
A vehicle seat equipped with a back radio wave sensor disposed at the lower end of the seat back on the diagonally lower side behind the seat with respect to the occupant's waist;
The seat back has a lower back panel that extends in the left-right direction of the seat at a lower end of the seat back and constitutes a part of the frame of the seat back,
The vehicle seat according to claim 1, wherein the back radio wave sensor is attached to the lower back panel. The seat back is
a lumbar support plate that is disposed diagonally above the front of the seat with respect to the lower back panel and supports the lumbar region of the occupant from the rear side of the seat;
a reclining rod that is disposed below the lumbar support plate and in front of the seat with respect to the lower back panel and extends in the left-right direction of the seat;
has
The vehicle seat according to claim 2, wherein the back radio wave sensor is disposed below the lumbar support plate and above the reclining rod. The seat cushion has a rear frame that extends in the left-right direction of the seat at a rear end of the seat cushion and constitutes a part of the frame of the seat cushion,
The vehicle seat according to any one of claims 1 to 3, wherein the cushion radio wave sensor is disposed diagonally downward in front of the seat with respect to the rear frame. The seat cushion has a plurality of cushion springs that are arranged side by side in the left-right direction of the seat and whose respective rear end portions are locked to the rear frame,
The vehicle seat according to claim 4, wherein the cushion radio wave sensor is supported by one or more of the cushion springs. comprising a connecting member that connects the rear end portions of the plurality of cushion springs in the left-right direction of the seat;
The vehicle seat according to claim 5, wherein the cushion radio wave sensor is attached to the connecting member. The vehicle seat according to any one of claims 1 to 6, wherein the cushion radio wave sensor is disposed offset in the seat left-right direction with respect to the center of the seat cushion in the seat left-right direction.