JP2013180654A - Vehicle seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a vehicle seat that can improve detection accuracy of a breathing state of an occupant seated on the seat.SOLUTION: A vehicle seat 10 includes: a seat back 14 that supports an upper part of a body of an occupant. Moreover, this seat back 14 includes: a seat back frame 20 that has a first subframe 36 and a second subframe 38 that extend to a seat width direction; and a seat back pad 22 that is mounted to this seat back frame 20, and when an occupant is seated, the seat rear side is enabled touch the first subframe 36 and the second subframe 38. In addition, a living body sensor 16 is installed in the seat front side of the seat back pad 22. Moreover, this living body sensor 16 is disposed to the chest opposite part of the seated occupant and disposed not to overlap with the first subframe 36 and the second subframe 38 in the seat front view.

Description

  The present invention relates to a vehicle seat.

  2. Description of the Related Art Conventionally, a vehicle seat that detects biometric information of an occupant seated on a seat by providing a biosensor on a seat back is known (see, for example, Patent Document 1 below).

JP 2007-61490 A

  By the way, when detecting the breathing state (chest fluctuation) of the occupant seated on the seat with the biosensor provided in the seat back, further improvement in the detection accuracy of the breathing state is desired.

  In view of the above facts, an object of the present invention is to provide a vehicle seat capable of improving the detection accuracy of a breathing state of an occupant seated on the seat.

  A vehicle seat according to the present invention described in claim 1 includes a frame member or a pad holding member that extends in the seat width direction at an intermediate portion in the seat height direction, and forms a skeleton of the seat back, and The seat back pad is attached to the seat back frame, and the rear side of the seat can be brought into contact with the frame member when the occupant is seated, and is provided on the front side of the seat back pad. And a biosensor disposed at a position opposite to the rib cage and disposed so as not to overlap the frame member or the pad holding member in a front view of the seat.

The effect | action of this invention of Claim 1 is as follows.
When the occupant sits on the vehicle seat and leans on the seat back, the seat back pad is deformed (elastically deformed) so as to curve toward the rear side of the seat. Here, since the contact portion of the seat back pad with the frame member or the pad holding member is supported by the frame member or the pad holding member, the deformation of the seat back pad at this portion is restricted. That is, the followability of the deformation of the seat back pad due to the change in the rib cage accompanying the breathing of the occupant is regulated by the frame member or the pad holding member. Therefore, when the biosensor is disposed so as to overlap the frame member or the pad holding member in the front view of the seat, the displacement amount of the biosensor is regulated.

  However, in the present invention, the biosensor is disposed so as not to overlap the frame member or the pad holding member when the seat is viewed from the front. For this reason, the followability of the deformation of the seat back pad at the portion where the biosensor is provided is hardly regulated by the frame member or the pad holding member. That is, it becomes difficult to regulate the displacement amount of the biosensor.

  A vehicle seat according to a second aspect of the present invention is the vehicle seat according to the first aspect, wherein the biosensor is provided so as to extend in a seat width direction.

  In the present invention, the biosensor is provided so as to extend in the sheet width direction. For this reason, it is possible to detect a change in the thorax of the seated occupant over a wide range in the seat width direction.

  According to a third aspect of the present invention, there is provided a vehicle seat according to the first or second aspect, wherein the frame member is an attachment portion for seat functional parts.

  In this invention of Claim 3, since the frame member is made into the attachment part of a seat functional component, it becomes possible to attach the seat functional component provided in the seat back stably.

  The vehicle seat according to the first and second aspects of the present invention has an excellent effect that the detection accuracy of the breathing state of the occupant seated on the seat can be improved.

  The vehicle seat according to the third aspect of the present invention has an excellent effect that the seat functional component provided on the seat back can be stably attached.

It is the perspective view which looked at the vehicle seat of this embodiment from the diagonally forward side of the seat. It is the expansion perspective view which looked at the seat back frame where the massage switching valve, the ventilation fan, and the retractor were attached from the slanting back side of the seat. (A) is sectional drawing which shows the cross section which cut | disconnected the seat back along the 3A-3A line of FIG. 2, (B) is a cross section which shows the cross section which cut | disconnected the seat back along the 3B-3B line of FIG. FIG. It is sectional drawing which shows the cross section cut | disconnected along line 4-4 of FIG.

  The vehicle seat according to the embodiment of the present invention will be described with reference to FIGS. The front side in the front-rear direction of the seat is indicated by an arrow FR, the width direction of the seat is indicated by an arrow W, and the upper side in the vertical direction of the seat is indicated by an arrow UP. Further, in the following description, when using the front and rear direction and the top and bottom direction without special mention, the front and rear direction of the seat and the top and bottom direction of the seat are shown.

  As shown in FIG. 1, the vehicle seat 10 according to the present embodiment is a separate seat that allows one occupant to be seated. Specifically, the vehicle seat 10 includes a seat cushion 12 that supports the occupant's buttocks and thighs, and a seat back 14 that supports the upper body of the occupant. Hereinafter, the seat cushion 12 will be described first, and then the seat back 14 will be described.

(Seat cushion 12)
The seat cushion 12 is formed so that both end portions in the seat width direction protrude toward the upper side of the seat, and the seat cushion pad 18 covered with the skin material is fixed to a seat cushion frame (not shown). It is configured. The seat cushion frame includes a pair of side frames, and a lower end portion of a seat back frame 20 described later is connected to a rear end portion of the side frame so as to be tiltable.

(Seat back 14)
The seat back 14 includes a seat back frame 20 that forms a skeleton of the seat back 14 and a seat back pad 22 that is attached so as to cover the seat back frame 20 from the front side of the seat. The seat back pad 22 is provided with a biosensor 16 that detects a breathing state (chest fluctuation) of a seated occupant. The seat back frame 20 is provided with a retractor 28 for winding the webbing 26 of the seat belt device 24 and a massage switching valve 30 for stimulating (massaging) the back of the occupant. Further, the seat back 14 is provided with a blower fan 32 that blows air toward the back of the passenger. Hereinafter, the seat back frame 20, the seat back pad 22, the biosensor 16, the retractor 28, the massage switching valve 30, and the blower fan 32 will be described in this order.

  As shown in FIG. 2, the seat back frame 20 includes a seat back frame main body 34 that is open to the lower side of the seat and is formed in a substantially U shape. The seat back frame main body 34 is disposed at both ends in the seat width direction and extends in the seat vertical direction, and a pair of vertical wall portions 34A and 34B, and the upper ends of the pair of vertical wall portions 34A and 34B. And a base wall portion 34C that connects the two. Further, the seat back frame 20 includes a first sub frame 36 and a second sub frame 38 as frame members that connect the pair of vertical wall portions 34A and 34B in the seat width direction. The first sub-frame 36 and the second sub-frame 38 are formed in a pipe shape and are arranged in parallel along the seat vertical direction.

  As shown in FIG. 1, the seat back pad 22 is formed of urethane foam and constitutes a cushion layer of the seat back 14. Specifically, as shown in FIGS. 3A and 3B, the seat back pad 22 includes a pad main body portion 22 </ b> A disposed at a center portion in the seat width direction of the seat back 14, and the pad main body portion. And 22 A of side support parts arrange | positioned at the sheet | seat width direction both sides. Further, groove portions 22C that open to the front side of the seat and extend in the seat height direction are respectively formed at the boundary between the pad main body portion 22A and the side support portion 22B. Further, the pad main body portion 22A can be in contact with the first sub-frame 36 and the second sub-frame 38 on the rear side of the seat when the occupant is seated. In addition, the surface of the seat back pad 22 is covered with a skin material 40 (see FIG. 1) formed using cloth, leather, or the like.

  As shown in FIGS. 1 and 4, the biological sensor 16 is a band-shaped pressure sensor. In the present embodiment, the two biosensors 16 are provided along the seat vertical direction, and the seat width direction is the longitudinal direction on the front surface of the pad main body 22A (and the inside of the skin material 40). Installed. Further, as shown in FIG. 4, the biometric sensor 16 is disposed at a position facing the thorax of the seated occupant H and is disposed so as not to overlap the first subframe 36 and the second subframe 38 in a front view of the seat. Yes. The outline of the seated occupant H indicated by the two-dot chain line is adopted in the side collision test method (ECE R95) adopted in Japan and Europe by the Japanese standard male dummy (JM50) and in the United States. It is the outline of the state seated on the seat in the sitting posture defined by the side collision test method (FMVSS214).

  As shown in FIGS. 1 and 2, the retractor 28 as a seat functional part includes a spool (not shown) that winds the webbing 26, a lock mechanism, a pretensioner mechanism, and the like. As shown in FIG. 2, the retractor 28 is disposed on the rear side of the seat back and on the upper side of the first subframe 36, and is fixed to the first subframe 36 via a bracket 42.

  As shown in FIGS. 1 and 2, a vibration generator for generating vibration is provided inside a massage switching valve 30 as an actuator. When this vibration generator operates, the massage switching valve 30 itself vibrates at a frequency of several hertz to several tens of hertz, and the back of the occupant is stimulated (massaged). The massage switching valve 30 is disposed at the chest-opposing portion of the seated occupant H (see FIG. 4) and provided on the upper side and the lower side of the first subframe 36, respectively. Further, the massage switching valve 30 is fixed to the first subframe 36 via brackets 44 and 46.

  As shown in FIG. 1, the blower fan 32 as a seat functional component is provided on the rear side of the second subframe 38.

(Operation and effect of this embodiment)
Next, the operation and effect of this embodiment will be described.

  When the occupant sits on the vehicle seat 10 shown in FIG. 1 and leans on the seat back 14, the seat back pad 22 constituting the seat back 14 is deformed so as to bend toward the seat rear side (elastic deformation). To do. Here, the portions of the seat back pad 22 that are in contact with the first sub-frame 36 and the second sub-frame 38 are supported by the first sub-frame 36 and the second sub-frame 38, and therefore the seat back pad 22 at this portion. The deformation of is regulated. That is, the deformation of the seat back pad 22 due to the change in the rib cage accompanying the breathing of the occupant is restricted by the first subframe 36 and the second subframe 38. Therefore, when the biosensor 16 is disposed so as to overlap the first subframe 36 and the second subframe 38 in the front view of the seat, the displacement amount of the biosensor 16 is restricted, and as a result, the biosensor 16 is affected by the thoracic variation of the occupant. It is conceivable that the detection accuracy of the sensor 16 decreases.

  However, in the present embodiment, the biosensor 16 is disposed so as not to overlap the first subframe 36 and the second subframe 38 when the seat is viewed from the front. Therefore, the deformation of the seat back pad 22 at the site where the biosensor 16 is provided is not easily restricted by the first subframe 36 and the second subframe 38. That is, the displacement amount of the biosensor 16 is difficult to be regulated. As a result, in this embodiment, the detection accuracy of the thorax variation by the biosensor 16 can be improved.

  Moreover, in this embodiment, the strip | belt-shaped biosensor 16 is provided so that it may extend in a sheet | seat width direction. For this reason, it is possible to detect a change in the thorax of the seated occupant over a wide range in the seat width direction. As a result, in this embodiment, the detection accuracy of the rib cage variation by the biosensor 16 can be further improved.

  In the present embodiment, the example in which the biosensor 16 is disposed in the chest-opposing portion in a state where a Japanese standard male dummy (JM50) is seated in a predetermined posture has been described, but the present invention is not limited thereto. Is not to be done. The physique of this dummy (seat occupant) may be appropriately set in consideration of the standard figure of people in the area where the vehicle is sold.

  Further, in the present embodiment, an example using the biosensor 16 formed in a band shape has been described, but the present invention is not limited to this, and biosensors of other shapes may be used.

  Furthermore, in this embodiment, although the example which provided the two biosensors 16 along the sheet | seat up-down direction has been demonstrated, this invention is not limited to this, One biosensor or three or more biosensors are provided. It is good also as a structure.

  In the present embodiment, an example in which the biosensor 16 is disposed so as not to overlap the first subframe 36 and the second subframe 38 when viewed from the front of the seat has been described. However, the present invention is limited to this. is not. For example, in a vehicle seat provided with a seat cushion wire as a pad holding member extending in the width direction of the seat, the biosensor 16 is arranged so as not to overlap the seat cushion wire in the front view of the seat. The same effect as the form can be obtained.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above, and various modifications other than the above can be implemented without departing from the spirit of the present invention. Of course.

10 Vehicle seat
14 Seat back
16 Biosensor
20 Seat back frame
22 Seat back pad
28 Retractor (Sheet functional parts)
30 Massage switching valve (Seat functional parts)
32 Blower fan (functional part of seat)
36 1st sub-frame (frame member)
38 Second subframe (frame member)
H Seated crew

Claims (3)

A seat back frame having a frame member or a pad holding member extending in the seat width direction at an intermediate portion in the seat height direction and forming a skeleton of the seat back;
A seat back pad that is attached to the seat back frame and that allows the rear side of the seat to contact the frame member when an occupant is seated,
A biosensor provided on the front side of the seat back pad, disposed at a position facing the thoracic area of a seated occupant, and disposed so as not to overlap the frame member or the pad holding member in a front view of the seat;
Vehicle seat equipped with   The vehicle seat according to claim 1, wherein the biosensor is provided so as to extend in a seat width direction.   The vehicle seat according to claim 1, wherein the frame member is an attachment portion for seat functional parts.

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