JP2013154850A - Vehicular seat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stabilize output from a biological information detection sensor.SOLUTION: In a driver's seat, a retainer 36 is provided on a back side of a sensor body 32 of a piezoelectric film sensor 30, and the retainer 36 permits deflection of the sensor body 32 toward the back side and regulates deflection of the sensor body 32 toward a front side. The piezoelectric film sensor 30 is contained in a sensor containing part of a seat back pad, and the retainer 36 is arranged on a seat rear side of the sensor body 32. Accordingly, for instance, even when a part of the sensor body 32 tries to deflect toward a seat front side due to posture of an occupant or the like, since the deformation is inhibited by the retainer 36, a deflecting direction of the sensor body 32 can be set mainly in a seat rear side direction. Therefore, irregular deformation of the sensor body 32 can be inhibited and thereby output from the piezoelectric film sensor 30 can be stabilized.

Description

  The present invention relates to a vehicle seat.

  The following Patent Document 1 discloses a driver emotion guidance device (vehicle seat) for guiding a driver's breathing in a regular cycle.

  On the other hand, when measuring the respiration of such a driver, for example, it is conceivable to use a respiration sensor (biological information detection sensor) composed of a piezoelectric film sensor or the like. This respiration sensor is provided, for example, on the seat front side portion of the seat back, and the respiration sensor is bent mainly to the rear side of the seat by a load acting on the respiration sensor from the driver. Thereby, a driver | operator's respiration can be measured according to the output from a respiration sensor.

JP 2005-296252 A

  However, when measuring the respiration of the driver using such a respiration sensor, for example, if a part of the respiration sensor bends to the front side of the seat due to the sitting posture of the driver, the deformation of the respiration sensor becomes irregular. Become. Thereby, the output from the respiration sensor may not be stable.

  In view of the above facts, an object of the present invention is to provide a vehicle seat that can stabilize the output from the biological information detection sensor.

  The vehicle seat according to claim 1 is provided on at least one of a seat cushion on which an occupant sits, a seat back that is provided at a rear end portion of the seat cushion, and supports the back of the occupant, and the seat cushion and the seat back. A biological information detection sensor having a sensor main body portion that detects biological information by being bent and deformed according to an input load, and is provided on the back side of the sensor main body portion and is bent to the back side of the sensor main body portion. And a restricting portion that allows deformation and restricts deformation of the sensor main body toward the front side.

  In the vehicle seat according to the first aspect, the biological information detection sensor is provided on at least one of the seat cushion and the seat back, and the biological information detection sensor has a sensor main body. Then, the biological information (for example, information such as breathing of the occupant) is detected by the sensor body being bent and deformed according to the load input to the sensor body.

  Here, a restricting portion is provided on the back side of the sensor main body, and the restricting portion allows the deformation of the sensor main body to the back side and restricts the deformation of the sensor main body to the front side.

  For this reason, even if a part of the sensor body part is bent toward the front side of the sensor body part, the deformation is suppressed by the restricting part, so the bending direction of the sensor body part is mainly set to the back side direction of the sensor body part. it can. Thereby, for example, when a biological information detection sensor is provided on the seat back, the sensor main body is mainly provided by a load input from the occupant to the sensor main body by providing a restricting portion on the seat rear side of the sensor main body. While being bent and deformed to the rear side of the seat, the bending of a part of the sensor main body to the front side of the seat is suppressed. Therefore, irregular bending deformation of the sensor main body can be suppressed, and as a result, the output from the biological information detection sensor is stabilized.

  The vehicle seat according to claim 2 is the vehicle seat according to claim 1, wherein the restricting portion is formed in the restricting portion, and a portion of the restricting portion on the side opposite to the sensor main body is defined as the restricting portion. A slit that is divided into a plurality of parts in the width direction of the sensor body is provided.

  In the vehicle seat according to claim 2, a slit is formed in the restricting portion, and a portion of the restricting portion on the side opposite to the sensor main body is divided into a plurality in the width direction of the sensor main body. (Hereinafter, this divided restriction part is referred to as “division restriction part”). Therefore, the division restricting portion is arranged along the width direction of the sensor main body portion.

  Thereby, for example, when the biological information detection sensor is provided on the seat back, the division restricting portion is disposed on the seat rear side portion of the restricting portion by providing the restricting portion on the seat rear side of the sensor main body portion. For this reason, when a load is input from the occupant to the sensor main body and the sensor main body tries to bend and deform toward the rear side of the seat, a tensile force to the outside of the sensor main body in the width direction acts on the division restricting portion. To do. And the division | segmentation control part isolate | separates from each other with this tension | tensile_strength, and the bending deformation of a sensor main-body part is accept | permitted.

  On the other hand, if a load on the front side of the seat is input to the sensor main body and the sensor main body tries to bend and deform toward the front of the seat, a compressive force on the inner side in the width direction of the sensor main body acts on the division restricting portion. To do. For this reason, the division restricting portions come into contact with each other by this compressive force, and the movement of the split restricting portion in the width direction of the sensor main body is restricted, so that the deformation of the sensor main body is restricted.

  According to a third aspect of the present invention, in the vehicle seat according to the second aspect, the vehicle seat includes a fitting portion that is formed on at least one of the seat cushion and the seat back and into which the restriction portion is fitted. Yes.

  In the vehicle seat according to the third aspect, the fitting portion is formed in at least one of the seat cushion and the seat back, and the fitting portion and the regulating portion are fitted. Thereby, a control part is hold | maintained at a fitting part and a biological information detection sensor is fixed to a seat cushion or a seat back. For this reason, it is not necessary to provide fixing means such as an adhesive for fixing the biological information detection sensor to the seat cushion or the seat back.

  According to the vehicle seat of the first aspect, the output from the biological information detection sensor can be stabilized.

  According to the vehicle seat of the second aspect, the output from the biological information detection sensor can be stabilized with a simple configuration.

  In the vehicle seat according to the third aspect, it is possible to improve the assembling property when the biological information detection sensor is assembled to the seat cushion or the seat back.

It is a perspective view which shows the piezoelectric film sensor used for the seat for drivers seats concerning this Embodiment. FIG. 5 is a partially cutaway side sectional view of the driver seat according to the present embodiment as viewed from the left side of the seat. FIG. 3 is an enlarged side cross-sectional view of a part of the driver seat shown in FIG. 2 as viewed from the left side of the seat. (A) And (B) is explanatory drawing for demonstrating the bending deformation of the sensor main-body part when a load acts on the piezoelectric film sensor shown by FIG. 1 from the opposite side to a passenger | crew. (A) And (B) is explanatory drawing for demonstrating the bending deformation of a sensor main-body part when a load acts on the piezoelectric film sensor shown by FIG. 1 from the passenger | crew side.

  FIG. 2 shows a partially cutaway side sectional view of the entire driver's seat 10 as a “vehicle seat” according to the present embodiment as viewed from the left side of the seat. A part of the driver's seat 10 is shown in an enlarged side sectional view as seen from the left side of the seat. Note that an arrow FR appropriately shown in the drawings indicates the front of the seat, an arrow UP indicates the upper portion of the seat, and an arrow RH indicates the right side of the seat.

  As shown in these drawings, the driver's seat 10 includes a seat cushion 12 on which an occupant (driver) sits, a seat back 18 that supports the back of the occupant, and a piezoelectric film sensor as a “biological information detection sensor”. 30.

  The seat cushion 12 has a cushion frame (not shown) constituting the skeleton of the seat cushion 12, and is fixed to a vehicle floor (not shown) via the cushion frame. The seat cushion 12 has a cushion pad 14 formed of a foam material such as urethane. The cushion pad 14 is supported by a cushion frame and covered with a skin 16.

  The seat back 18 is provided in an upright state at an end of the seat cushion 12 on the rear side of the seat. The seat back 18 has a seat back frame (not shown) constituting the skeleton of the seat back 18, and the seat back frame is coupled to the seat cushion 12 via a reclining mechanism (not shown) or the like. . In addition, the seat back 18 has a seat back pad 20 (an element grasped as a “pad” in a broad sense) formed of a foam material such as urethane, and the seat back pad 20 is a seat back pad 20. Supported by the frame and covered by the skin 22.

  As shown in FIG. 3, a sensor accommodating portion 24 for accommodating a piezoelectric film sensor 30 described later is formed in the lower portion of the seat back pad 20 in the front portion of the seat. Concave shape opened to the front side. Further, a fitting recess 26 as a “fitting portion” is provided in the sensor housing portion 24, and the fitting recess 26 is opened to the front side of the seat and is longitudinally viewed from the front side of the seat. Is formed in a substantially long rectangular shape with the sheet width direction. In this fitting recess 26, a retainer 36 of a piezoelectric film sensor 30 described later is configured to be fitted. The seat back pad 20 has a substantially rectangular plate-like cover pad 28 in the sensor housing portion 24. The cover pad 28 is fitted into the sensor housing portion 24 and covers the front side portion of the piezoelectric film sensor 30 housed in the sensor housing portion 24.

  As shown in FIG. 1, the piezoelectric film sensor 30 includes a sensor main body 32, an output unit 34, and a retainer 36 as a “regulating unit”, and is accommodated in the sensor accommodating unit 24 described above. (See FIG. 3).

  The sensor body 32 is formed in a substantially long rectangular film shape as a whole, and has a piezoelectric film, a pair of electrodes, and a pair of insulating layers (not shown). The piezoelectric film is formed of, for example, a piezoelectric ceramic such as PVDF (polyvinylidene fluoride), and a pair of electrodes are laminated on both sides of the piezoelectric film. Further, the pair of insulating layers are formed in a film shape with a resin and are laminated on the pair of electrodes to constitute the outer peripheral surface of the sensor body 32.

  The output unit 34 is provided on one side in the longitudinal direction (one side in the width direction) of the sensor main body 32 and is formed integrally with the sensor main body 32. The output unit 34 is electrically connected to the pair of electrodes of the sensor body 32 and is also electrically connected to a vehicle control unit (not shown) via an amplifier.

A load in the longitudinal direction (sheet width direction) of the sensor main body 32 and a load in the thickness direction of the sensor main body 32 are input to the sensor main body 32, and the sensor main body 32 is bent and deformed. The film is configured to be dielectrically polarized to generate an electric charge on the electrodes (a potential difference is generated between the electrodes). Thereby, the control unit detects the output from the output unit 34 as a voltage.

  The retainer 36 is made of resin and is formed in a substantially long rectangular parallelepiped shape. The retainer 36 is disposed along the longitudinal direction of the sensor main body 32 at one end in the direction orthogonal to the longitudinal direction of the sensor main body 32 on the back side surface of the sensor main body 32 and the surface on the back side. It is fixed to the sensor main body 32 with an agent or the like. The retainer 36 is fitted into the fitting recess 26 of the seat back pad 20 and is held in the fitting recess 26 (see FIG. 3). Thereby, the front side surface of the sensor main body portion 32 is arranged toward the front side of the seat (occupant side), and the rear side surface of the sensor main body portion 32 is arranged toward the rear side of the seat (opposite side of the occupant), The piezoelectric film sensor 30 is assembled to the seat back pad 20 with the longitudinal direction as the sheet width direction. In addition, the sensor main body 32 is set to be disposed substantially behind the occupant's diaphragm so that the sensor main body 32 bends and deforms in accordance with the movement of the upper body of the occupant accompanying the breathing of the occupant. By doing so, it is configured to measure biological information (information such as occupant breathing).

  Further, the retainer 36 is formed with a plurality of slits 38, and the slits 38 are arranged at predetermined intervals in the longitudinal direction of the sensor main body 32. The slit 38 extends from the rear side surface of the retainer 36 to the front side of the front side surface of the retainer 36 along the front-rear direction of the retainer 36 when viewed from above the seat. That is, the seat front side portion of the retainer 36 is formed continuously along the longitudinal direction of the retainer 36, and the seat rear side portion of the retainer 36 is divided by the slits 38. The divided retainer 36 is a divided retainer portion 40.

  As a result, as shown in FIG. 5A, when the load F to the rear side of the seat acts on the sensor main body 32, the sensor main body 32 is moved to the rear side of the seat (the back side of the sensor main body 32). It tries to bend and deform (it tries to bend so as to be convex toward the rear side of the sheet). For this reason, the tensile force to the division retainer part 40 in the longitudinal direction outer side (arrow A direction of FIG. 5 (A)) of the retainer 36 acts. Then, as shown in FIG. 5B, the tensile force is used to separate the split retainer portions 40 facing each other, and the sensor body portion 32 is allowed to bend and deform toward the rear side of the seat. Yes.

  On the other hand, as shown in FIG. 4A, when the load F to the front side of the seat acts on the sensor main body 32, the sensor main body 32 tends to bend and deform to the front side of the seat (the front side of the sensor main body 32). (Trying to bend so as to be convex toward the front side of the sheet). For this reason, a compressive force acts on the inner side in the longitudinal direction of the retainer 36 (in the direction of arrow B in FIG. 4A) on the split retainer portion 40. Then, as shown in FIG. 4B, the compressive force causes the split retainer portions 40 facing each other to come into contact with each other, so that the deformation of the sensor main body portion 32 toward the front side of the seat is regulated. Yes.

  Next, the operation and effect of the present embodiment will be described.

  In the driver seat 10 configured as described above, when the occupant is seated on the driver seat 10, the back of the occupant is supported by the seat back pad 20 of the seat back 18. A load is input from the occupant to the piezoelectric film sensor 30 through the cover pad 28 according to the movement of the upper body of the occupant accompanying the breathing of the occupant, and the sensor main body 32 of the piezoelectric film sensor 30 is bent and deformed. Thereby, the control part of a vehicle detects the output from the output part 34 as a voltage, and biometric information, such as a passenger | crew's respiration, is detected.

  Here, a retainer 36 is provided on the back side of the sensor main body portion 32 of the piezoelectric film sensor 30, and the retainer 36 allows bending deformation to the back side of the sensor main body portion 32, and the front side of the sensor main body portion 32. Regulates bending deformation. The piezoelectric film sensor 30 is housed in the sensor housing portion 24 of the seat back pad 20, and a retainer 36 is disposed on the seat rear side of the sensor main body portion 32. For this reason, for example, even if a part of the sensor main body 32 tries to bend and deform toward the front side of the seat (the front side of the sensor main body 32) due to the posture of the occupant, the deformation is suppressed by the retainer 36. 32 bending directions can be set mainly in the sheet rear side direction. Therefore, irregular deformation of the sensor main body 32 can be suppressed, and the output from the piezoelectric film sensor 30 can be stabilized.

  Further, the retainer 36 is formed with a plurality of slits 38, and the slits 38 are arranged at predetermined intervals (intermittently) in the longitudinal direction (width direction) of the sensor main body 32. Thereby, the sheet rear side portion of the retainer 36 is divided in the longitudinal direction of the sensor main body portion 32, and the divided divided retainer portion 40 is arranged along the longitudinal direction of the sensor main body portion 32.

  As a result, when the load F from the occupant to the rear side of the seat is input to the sensor main body portion 32 and the sensor main body portion 32 tends to bend and deform toward the rear side of the seat, the split retainer portion 40 has the longitudinal length of the sensor main body portion 32. A tensile force acts outward in the direction (the direction of arrow A in FIG. 5A). For this reason, when the split retainer portions 40 are separated from each other by this tensile force (see FIG. 5B), the sensor body portion 32 is allowed to bend and deform toward the rear side of the seat.

  On the other hand, if the load F to the front side of the seat is input to the sensor main body 32 and the sensor main body 32 tries to bend and deform to the front side of the seat, the split retainer portion 40 has an inner side in the longitudinal direction of the sensor main body 32 (FIG. 4 (A) arrow B direction) acts. For this reason, the split retainer portions 40 come into contact with each other by this compressive force, and the movement of the split retainer portion 40 in the longitudinal direction of the sensor main body portion 32 is restricted, so that the deformation deformation of the sensor main body portion 32 toward the front side of the seat is caused. It is regulated (see FIG. 4B). As described above, since the retainer 36 is provided with the slit 38, the bending direction of the sensor main body 32 can be set to one direction, so that the output from the piezoelectric film sensor 30 can be stabilized with a simple configuration.

  Further, a fitting recess 26 is formed in the seat back pad 20 of the seat back 18, and the fitting recess 26 and the retainer 36 of the piezoelectric film sensor 30 are fitted. As a result, the retainer 36 is held in the fitting recess 26, and the piezoelectric film sensor 30 is assembled to the seat back pad 20. For this reason, in order to fix the piezoelectric film sensor 30 to the seat back pad 20, it is not necessary to provide fixing means such as an adhesive, so that the assembling property when the piezoelectric film sensor 30 is assembled to the seat back pad 20 is improved. it can.

  In the present embodiment, the piezoelectric film sensor 30 is provided in the seat back pad 20 of the seat back 18. Alternatively, the piezoelectric film sensor 30 may be provided in the cushion pad 14 of the seat cushion 12. In this case, the sensor accommodating portion 24 and the fitting concave portion 26 are formed in the cushion pad 14, and the back side surface of the sensor main body portion 32 is disposed toward the lower side of the seat. Further, the piezoelectric film sensor 30 may be provided in the seat back pad 20 of the seat back 18 and in the cushion pad 14 of the seat cushion 12, respectively.

  Further, in the present embodiment, the sensor accommodating portion 24 is provided in the seat lower portion and the seat front portion of the seat back pad 20, but the position of the sensor accommodating portion 24 can be arbitrarily set. For example, the sensor accommodating portion 24 may be provided in the seat upper portion and the seat front portion of the seat back pad 20. Specifically, you may comprise so that the piezoelectric film sensor 30 may be arrange | positioned substantially back of a passenger | crew's chest. Thus, the occupant's heart rate information can also be measured according to the movement of the upper body due to the occupant's heartbeat.

  Furthermore, in the present embodiment, the slit 38 is formed along the front-rear direction of the sheet as viewed from above the sheet, but the shape of the slit 38 viewed from above the sheet can be arbitrarily set. For example, the slit 38 may be formed to be inclined with respect to the longitudinal direction of the seat.

  In the present embodiment, the slit 38 extends from the rear side surface of the retainer 36 to the front side of the front surface of the sheet. Alternatively, the slit 38 may be extended from the sheet rear side surface of the retainer 36 to the sheet front side surface. That is, the seat front side portion of the retainer 36 may also be divided by the slit 38, and the retainer 36 may be configured by a plurality of divided retainer portions 40.

  Further, in the present embodiment, the retainer 36 is fixed to the back surface of the sensor main body 32 by an adhesive. Alternatively, the retainer 36 may be formed integrally with the sensor body 32 when the sensor body 32 is formed. Thereby, the cost increase of the piezoelectric film sensor 30 can be suppressed.

  In the present embodiment, the cover pad 28 is provided on the front side of the sheet of the piezoelectric film sensor 30, and the surface of the sensor main body 32 is covered with the cover pad 28. Alternatively, the cover pad 28 may be omitted, and the skin 22 may be configured to cover the surface of the sensor main body 32. In this case, the depth dimension of the sensor housing portion 24 is made substantially the same as the thickness dimension of the sensor main body portion 32 so that the load from the occupant acts on the sensor main body portion 32 via the skin 22. Also good.

10 Driver's seat (vehicle seat)
12 Seat cushion 18 Seat back 26 Fitting recess (fitting portion)
30 Piezoelectric film sensor (biological information detection sensor)
32 Sensor body 36 Retainer (Regulator)
38 slits

Claims (3)

A seat cushion on which an occupant sits,
A seat back that is provided at a rear end of the seat cushion and supports a back of an occupant;
A biological information detection sensor provided on at least one of the seat cushion and the seat back, and having a sensor main body that detects biological information by bending and deforming according to an input load;
A regulating portion that is provided on the back side of the sensor main body portion, allows bending deformation to the back side of the sensor main body portion, and restricts bending deformation to the front side of the sensor main body portion;
Vehicle seat equipped with   The vehicle seat according to claim 1, further comprising a slit formed in the restricting portion and dividing a portion of the restricting portion opposite to the sensor main body into a plurality in the width direction of the sensor main body.   The vehicle seat according to claim 2, further comprising a fitting portion that is formed on at least one of the seat cushion and the seat back and into which the restriction portion is fitted.