JP2011182827A - Seat belt displacement detecting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seat belt displacement detecting device allowing detection means to be easily set. <P>SOLUTION: In a seat belt device 14, a seat belt 24 is displaced by the respiration and heartbeat of an occupant 16 and moved in the longitudinal direction in a slip joint 26 when the seat belt 24 is attached to the occupant 16. In the slip joint 26, the seat belt 24 is imaged by a sensor, and the distance of transfer of the seat belt 24 in the slip joint 26 is calculated, so that the biological state of the occupant 16 is detected. As the sensor is set in the slip joint 26, the sensor can be easily set in the seat belt device 14. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a seatbelt displacement detection device that detects a displacement of a seatbelt worn on a vehicle occupant and detects a living state of the occupant.

  In the living body state determination device described in Patent Document 1 below, a human body sensor (piezoelectric cable sensor) is provided on the surface of the seat belt that contacts the driver or inside the seat belt. By changing the shape of the sensor, the human body sensor detects a minute displacement (vibration) of the seat belt, and the biological state of the driver is determined.

  However, in this living body state determination apparatus, a human body sensor is provided on the seat belt. For this reason, it is necessary to install the harness provided in the human body sensor along the seat belt, and it is difficult to install the human body sensor (including the harness).

JP 2005-95408 A

  An object of the present invention is to obtain a seat belt displacement detection device in which the detection means can be easily installed in consideration of the above facts.

  The seatbelt displacement detection device according to claim 1 is provided with a seatbelt to be mounted on a vehicle occupant, a passage member through which the seatbelt is movably passed, and a movement of the seatbelt provided in the passage member. And detecting means for detecting at least one of the breathing and heartbeat of the occupant to detect the occupant's biological state.

  The seatbelt displacement detection device according to claim 2 is the seatbelt displacement detection device according to claim 1, wherein the detection unit includes an imaging unit that images the seat belt, and the imaging unit captures the image. The movement of the seat belt is detected based on the image of the seat belt.

  According to a third aspect of the present invention, in the seat belt displacement detecting device according to the second aspect, the photographing means photographs an enlarged image of the seat belt.

  The seat belt displacement detection device according to claim 4 is the seat belt displacement detection device according to claim 1, wherein the detection means includes a moving member that is moved by the movement of the seat belt. The movement of the seat belt is detected based on the movement.

  According to a fifth aspect of the present invention, there is provided the seat belt displacement detecting device according to the fourth aspect, further comprising a pressing unit that presses the seat belt to contact the moving member.

  In the seat belt displacement detection device according to the first aspect, the seat belt mounted on the vehicle occupant is movably passed through the passage member.

  Here, the detection means provided in the passage member detects the movement of the seat belt, thereby detecting at least one of the breathing and heartbeat of the occupant and detecting the biological state of the occupant.

  Thus, since the detection means provided on the passage member detects the movement of the seat belt, the detection means may be installed on the passage member. Thereby, a detection means can be installed easily.

  In the seat belt displacement detection device according to the second aspect, in the detection means, the photographing means photographs the seat belt, and the movement of the seat belt is detected based on the image of the seat belt photographed by the photographing means. For this reason, the detection means can detect the movement of the seat belt with high accuracy.

  In the seat belt displacement detecting device according to the third aspect, the photographing means photographs an enlarged image of the seat belt. For this reason, the detection means can detect the movement of the seat belt with higher accuracy.

  In the seat belt displacement detecting device according to the fourth aspect, in the detection means, the moving member is moved by the movement of the seat belt, and the movement of the seat belt is detected based on the movement of the moving member. For this reason, the detection means can detect the movement of the seat belt with high accuracy.

  In the seat belt displacement detection device according to the fifth aspect, the pressing means presses the seat belt to contact the moving member. For this reason, the moving member can reliably move following the movement of the seat belt, and the detecting means can detect the movement of the seat belt with higher accuracy.

It is the perspective view seen from the vehicle front diagonal left which shows the principal part of the vehicle by which the seatbelt displacement detection apparatus which concerns on the 1st Embodiment of this invention was provided. It is the front view seen from the vehicle left side which shows the slip joint of the seatbelt displacement detection apparatus which concerns on the 1st Embodiment of this invention. FIG. 3 is a cross-sectional view (cross-sectional view taken along line 3-3 in FIG. 2) viewed from the vehicle front side, showing the slip joint of the seatbelt displacement detection device according to the first embodiment of the present invention. It is sectional drawing (3-3 line position sectional drawing of FIG. 2) seen from the vehicle front side which shows the slip joint in the seatbelt displacement detection apparatus which concerns on the 2nd Embodiment of this invention.

[First Embodiment]
FIG. 1 is a perspective view of a main part of a vehicle 12 provided with a seatbelt displacement detection device 10 according to a first embodiment of the present invention as seen obliquely from the left front of the vehicle. In the drawings, the front side of the vehicle is indicated by an arrow FR, the outer side in the vehicle width direction (right side of the vehicle) is indicated by an arrow WO, and the upper side is indicated by an arrow UP.

  As shown in FIG. 1, a seatbelt displacement detection device 10 according to the present embodiment is applied to a seatbelt device 14 of a vehicle 12, and the seatbelt device 14 is in a passenger compartment 16 (for example, a driver). Is mounted on a seat 18 (for example, a driver's seat). A center pillar 20 as a fixing member is provided on the outer side in the vehicle width direction of the seat 18 and on the rear side of the vehicle. The center pillar 20 constitutes a vehicle body and extends in the vertical direction.

  The seat belt device 14 includes a winding device 22 (retractor), and the winding device 22 is fixed to a lower portion of the center pillar 20. A long belt-like seat belt 24 is wound around the winding device 22 from the base end side (one side in the longitudinal direction). The seat belt 24 is made of woven fabric (webbing), and a texture pattern (not shown) as a position display means is formed on the surface of the seat belt 24. The winding device 22 is provided with a biasing mechanism (not shown), and the biasing mechanism applies a biasing force to the seat belt 24 toward the base end side (winding side to the winding device 22). ing.

  The seat belt 24 is inserted (passed) under a plate-shaped slip joint 26 (shoulder anchor) as a passing member, and the seat belt 24 can be moved (slid) in the longitudinal direction with respect to the slip joint 26. ing. The slip joint 26 is supported at the upper portion by a support shaft 28 attached to the upper portion of the center pillar 20, and the slip joint 26 is rotatable in the vehicle front-rear direction around the support shaft 28. The seat belt 24 is supported by a slip joint 26, and the seat belt 24 extends upward along the center pillar 20 from the winding device 22 toward the slip joint 26.

  The front end (the other end in the longitudinal direction) of the seat belt 24 is locked to an anchor plate 30 as a locking member, and the anchor plate 30 is on the center pillar 20 side (vehicle width direction outer side) and lower side of the seat 18. It is fixed to the car body. The seat belt 24 is inserted (passed) into a tongue 32 as an additional passage member between the slip joint 26 and the anchor plate 30, and the seat belt 24 can move (slide) in the longitudinal direction with respect to the tongue 32. Has been.

  A buckle device 34 as a locking means is arranged on the opposite side (inner side in the vehicle width direction) and lower side of the seat 18 from the center pillar 20. The buckle device 34 is fixed to the upper end of a long plate-like support plate 36 as a support member, and the lower end of the support plate 36 is fixed to the vehicle body. The support plate 36 is flexible, and the buckle device 34 can move in the vehicle width direction (rotates around the lower end of the support plate 36) by elastically bending the support plate 36. Has been.

  Here, when the tongue 32 is locked to the buckle device 34, the seat belt 24 is attached to the occupant 16 seated on the seat 18. Thus, in the shoulder belt portion 24A between the slip joint 26 and the tongue 32, the shoulder portion 16A and the waist portion 16B of the occupant 16 in a state where the seat belt 24 is stretched by the urging force of the urging mechanism of the winding device 22. Between the tongue 32 and the anchor plate 30 and at the lap belt portion 24B between the tongue 32 and the anchor plate 30 in the lateral direction. For this reason, the shoulder belt portion 24A is brought into contact with the shoulder 16A, the chest portion 16C and the upper abdomen 16D of the occupant 16 from the front side by the biasing force of the biasing mechanism, and the lap belt portion 24B is pressed by the biasing force of the biasing mechanism. The lower abdomen 16E of the occupant 16 is contacted from the front side.

  Further, when the seat belt 24 is attached to the occupant 16, the shoulder belt portion 24A is arranged on the vehicle front side with respect to the slip joint 26, whereby the slip joint 26 is rotated to the vehicle front side and the upper side.

  As shown in FIG. 2, a U-shaped insertion hole 38 as a passing portion is formed through the lower portion of the slip joint 26, and the seat belt 24 is inserted into the lower portion of the insertion hole 38 so as to be movable in the longitudinal direction. And supported by the slip joint 26 in a folded state. The longitudinal dimension (lateral direction of the slip joint 26) of the lower portion of the insertion hole 38 is slightly larger than the width direction dimension of the seat belt 24, and the seat belt 24 moves in the longitudinal direction of the lower portion of the insertion hole 38. Is suppressed.

  As shown in FIG. 3, the slip joint 26 is provided with a piece 40 as a support portion below the insertion hole 38, and the upper side surface of the piece 40 is curved in a circular cross section. The upper side surface of the piece 40 constitutes the lower side surface of the lower portion of the insertion hole 38, and the upper side surface of the piece 40 is brought into contact with the seat belt 24 in a wound state and can be moved smoothly.

  In the upper part of the piece 40, an LED 42 as a light irradiating means is provided, and the LED 42 can emit light (for example, red light).

  In the upper part of the piece 40, a block-shaped transparent member 44 having a predetermined shape as an enlarging means is provided on the light irradiation side of the LED 42. The transparent member 44 is made of a transparent material such as glass, for example. And a prism.

  The transparent member 44 has a planar incident surface 44A formed on the light irradiation side of the LED 42, and the light irradiated by the LED 42 enters the transparent member 44 from the incident surface 44A. The transparent member 44 is formed with a planar first reflecting surface 44B and a second reflecting surface 44C, and light incident on the transparent member 44 from the incident surface 44A is reflected by the first reflecting surface 44B. The light reflected by the first reflecting surface 44B is reflected by the second reflecting surface 44C. The transparent member 44 has a flat irradiation surface 44D, and the light reflected by the second reflection surface 44C is irradiated from the irradiation surface 44D to the outside of the transparent member 44.

  An opening 46 is formed at the upper end portion of the piece 40 in the vicinity of the irradiation surface 44D of the transparent member 44. The opening 46 is opened on the upper side of the piece 40 by opening the upper portion of the piece 40 upward. The seat belt 24 is exposed in the upper part of the piece 40. Thereby, the light irradiated from the irradiation surface 44D of the transparent member 44 is obliquely irradiated to the surface of the seat belt 24 through the opening 46, and the light irradiated on the surface of the seat belt 24 is irregularly reflected.

  The transparent member 44 is formed with an incident portion 44E (lens) having a triangular cross section so as to face the light irradiation portion on the surface of the seat belt 24, and a part of the light irregularly reflected on the surface of the seat belt 24 has an opening 46. Then, the light enters the transparent member 44 from the incident portion 44E. The transparent member 44 is formed with a flat emission surface 44F, and light incident from the incident portion 44E into the transparent member 44 is emitted from the emission surface 44F to the outside of the transparent member 44.

  In the upper part of the piece 40, a sensor 48 is provided as an imaging unit constituting a detection unit on the light emission side from the emission surface 44 </ b> F of the transparent member 44, and the sensor 48 is an emission surface 44 </ b> F of the transparent member 44. As a result, the enlarged image of the surface of the seat belt 24 can be taken.

  A control board 50 as a control means constituting the detection means is fixed in the upper part of the piece 40, and a control circuit (not shown) is provided on the control board 50. The LED 42, the transparent member 44, and the sensor 48 are fixed on the control board 50. The LED 42 and the sensor 48 are electrically connected to the control board 50 (control circuit), and the control board 50 (control circuit) is connected to the control board 50. It is made controllable.

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

  In the seat belt device 14 having the above-described configuration, the tongue 32 is locked to the buckle device 34, whereby the seat belt 24 is attached to the occupant 16 seated on the seat 18. As a result, the seat belt 24 is biased toward the base end side (winding side to the winding device 22) by the biasing mechanism of the winding device 22, and the shoulder portion 16A of the occupant 16 in the shoulder belt portion 24A. The chest 16C and the upper abdomen 16D are contacted.

  For this reason, the shoulder belt portion 24A of the seat belt 24 is moved to the front side and the rear side of the occupant 16 due to the movement of at least one front surface of the shoulder portion 16A, the chest portion 16C, and the upper abdominal portion 16D due to breathing and heartbeat of the occupant 16 It is displaced (vibrated) slightly to the side. As a result, the seat belt 24 is slightly moved in the slip joint 26 along the longitudinal direction against the urging force of the urging mechanism toward the shoulder belt portion 24A, and is wound by the urging force of the urging mechanism. It is moved slightly to the take-out device 22 side.

  In the piece 40 of the slip joint 26, the LED 42 emits light under the control of the control board 50, so that the light irradiated by the LED 42 is incident on the incident surface 44A, the first reflecting surface 44B, the second reflecting surface 44C of the transparent member 44, The surface of the seat belt 24 is obliquely irradiated through the irradiation surface 44D and the opening 46 of the piece 40, and the surface of the seat belt 24 is irregularly reflected.

  Further, part of the light irregularly reflected by the surface of the seat belt 24 is incident on the sensor 48 through the opening 46 of the piece 40, the incident portion 44E of the transparent member 44, and the exit surface 44F.

  Thereby, under the control of the control board 50, the sensor 48 takes an enlarged image of the surface (texture pattern) of the seat belt 24 at every minute time interval, and the control board 50 stores (samples) it as an image. Further, the control board 50 compares the magnified image of the surface (texture pattern) of the seat belt 24 stored this time with the magnified image of the surface (texture pattern) of the seat belt 24 stored last time. The movement distance in the longitudinal direction of the seat belt 24 at the joint 26 is calculated (measured) based on the change in the position of the texture pattern.

  In this way, the control board 50 calculates the movement distance in the longitudinal direction of the seat belt 24 at the slip joint 26 associated with the breathing and heartbeat of the occupant 16, so that the biological state of the occupant 16 (the magnitude of breathing and heartbeat and (Speed) can be detected, and information can be provided as one of the biological information sensors for the system that detects the physical condition such as the tension state, the awakening state, and the fatigue state of the occupant 16. Note that the control board 50 detects the speed of the breathing and heartbeat of the occupant 16 by differentiating the travel distance of the slip joint 26 in the longitudinal direction of the seat belt 24 with respect to time.

  Here, the LED 42, the transparent member 44, the sensor 48, and the control board 50 are installed in the slip joint 26. For this reason, LED42, the transparent member 44, the sensor 48, and the control board 50 can be easily installed in the seatbelt apparatus 14. FIG. Moreover, since the LED 42, the transparent member 44, the sensor 48, and the control board 50 can be installed in the vehicle 12 if the seat belt device 14 is installed in the vehicle 12 as usual, the LED 42, the transparent member 44, the sensor 48, and the control board 50 are installed. Can be easily installed in the vehicle 12.

  Furthermore, the occupant 16 can detect the biological state of the occupant 16 only by wearing the seat belt 24 as usual. For this reason, it is possible to prevent the passenger 16 from being bothered.

  Further, the control board 50 measures the moving distance of the seat belt 24 at the slip joint 26. For this reason, it is not necessary for the control board 50 to amplify the travel distance information of the seat belt 24 excessively, and it is possible to reduce the influence of disturbance (noise) on the detection of the biological state of the occupant 16, and Can be detected with high accuracy. In addition, since the breathing and heart rate of the occupant 16 can be directly detected, the breathing and heart rate of the occupant 16 can be detected with high accuracy.

  Further, based on the enlarged image of the surface of the seat belt 24 taken by the sensor 48, the control board 50 calculates the moving distance of the seat belt 24 at the slip joint 26. For this reason, the biological state of the passenger 16 can be detected with higher accuracy.

  Further, the seat belt 24 is urged toward the base end side by the urging mechanism of the winding device 22, and the shoulder portion 16A, the chest portion 16C and the upper abdomen of the occupant 16 in the shoulder belt portion 24A on the distal end side from the slip joint 26. It is attached to 16D. For this reason, the seat belt 24 can sufficiently move in the longitudinal direction at the slip joint 26 along with the breathing and heartbeat of the occupant, and the biological state of the occupant 16 can be detected with higher accuracy.

  In the present embodiment, a texture pattern is formed on the surface of the seat belt 24 and the movement in the longitudinal direction of the seat belt 24 is measured by the movement of the texture pattern. A mark may be provided as a position display means, and the movement of the seat belt 24 in the longitudinal direction may be measured by the movement of the mark.

[Second Embodiment]
FIG. 4 is a cross-sectional view (cross-sectional view taken along line 3-3 in FIG. 2) of the slip joint 26 in the seatbelt displacement detection device 60 according to the second embodiment of the present invention as viewed from the vehicle front side. ing.

  The seatbelt displacement detection device 60 according to the present embodiment has substantially the same configuration as the first embodiment, but differs in the following points.

  As shown in FIG. 4, in the seat belt displacement detection device 60 according to the present embodiment, the LED 42, the transparent member 44, the sensor 48, the control board 50, and the opening 46 are not provided in the piece 40 of the slip joint 26.

  The piece 40 is divided into an upper pressing portion 62 and a main body portion 64 other than the pressing portion 62. The pressing portion 62 is opposite to the insertion hole 38 side and the insertion hole 38 with respect to the main body portion 64. It is possible to move (slide) to the side. The upper side surface of the pressing portion 62 constitutes the upper side surface of the piece 40, and the upper side surface of the pressing portion 62 is smoothly brought into contact with the seat belt 24 inserted through the lower portion of the insertion hole 38 in a wound state. It has been made movable.

  A plurality of compression coil springs 66 serving as pressing means (biasing means) are provided in the upper portion of the main body portion 64, and the compression coil springs 66 are bridged between the pressing portion 62 and the main body portion 64. The pressing portion 62 is pressed (biased) toward the insertion hole 38. For this reason, the seat belt 24 inserted into the lower portion of the insertion hole 38 is pressed (biased) toward the insertion hole 38 by the pressing portion 62.

  In the slip joint 26, a substantially cylindrical detection roller 68 as a moving member constituting a detecting means is supported on the upper side below the insertion hole 38 so as to be freely rotatable (movable) on an integral rotating shaft 68A. The rotation axis direction of the detection roller 68 (rotation shaft 68A) is arranged in parallel to the longitudinal direction of the lower portion of the insertion hole 38. As described above, the seat belt 24 inserted into the lower portion of the insertion hole 38 is pressed toward the insertion hole 38 by the pressing portion 62, so that the seat belt 24 is always in contact with the outer periphery of the detection roller 68. 24 is always sandwiched between the pressing portion 62 and the detection roller 68 by the urging force of the compression coil spring 66. A plurality of conical roller teeth 68B serving as piercing portions are provided on the entire outer periphery of the detection roller 68, and the tips of the roller teeth 68B can be pierced into the seat belt 24. As a result, the frictional force between the seat belt 24 and the outer periphery of the detection roller 68 is increased, and the detection roller 68 is always rotated as the seat belt 24 moves in the longitudinal direction at the slip joint 26. The moving distance of the seat belt 24 in the longitudinal direction at the slip joint 26 is made equal to the rotational distance of the outer periphery of the detection roller 68.

  Around the detection roller 68 (or around the rotation shaft 68A), a sensor 70 is provided as a measurement unit constituting the detection unit. The sensor 70 is a sliding resistance sensor (position sensor), a capacitance sensor, an MR sensor (magnetic resistance sensor), or the like, and the sensor 70 measures the rotation position (including the rotation angle position) of the detection roller 68. Has been made possible.

  The sensor 70 is electrically connected to a control device 72 serving as control means that constitutes detection means.

  Here, under the control of the control device 72, the sensor 70 measures the rotational position of the detection roller 68 at every minute time interval, and the control device 72 stores (samples). Further, the control device 72 compares the rotational position of the detection roller 68 stored this time with the rotational distance or rotational position of the detection roller 68 stored last time, so that the longitudinal direction of the seat belt 24 at the slip joint 26 is increased. The movement distance is calculated (measured) based on the change in the rotational position of the detection roller 68.

  Thereby, also in the present embodiment, the same operations and effects as those in the first embodiment can be obtained except for the effect obtained by the sensor 48 capturing an enlarged image of the surface of the seat belt 24.

  Further, the seat belt 24 inserted into the lower portion of the insertion hole 38 of the slip joint 26 is always held between the pressing portion 62 and the detection roller 68 by the urging force of the compression coil spring 66. In addition, the tip of the roller teeth 68B on the outer periphery of the detection roller 68 can be pierced into the seat belt 24. Therefore, the detection roller 68 can reliably follow the movement of the seat belt 24 in the longitudinal direction of the slip joint 26 and rotate, and the distance of the movement of the seat belt 24 in the longitudinal direction of the slip joint 26 can be determined. Can be equal to the rotation distance. Thereby, the biological state of the passenger 16 can be detected with higher accuracy.

  In the present embodiment, the detection roller 68 (moving member) is rotated along with the movement of the seat belt 24 in the longitudinal direction of the slip joint 26. However, the detection roller 68 (moving member) is rotated in the longitudinal direction of the slip joint 26 of the seat belt 24. It is good also as a structure by which a moving member is rotated or slid with this movement.

  In the first embodiment and the second embodiment, the sensor 48 and the sensor 70 measure the movement distance of the slip joint 26 in the longitudinal direction of the seat belt 24. However, the sensor 48 and sensor 70 may be configured to measure the moving speed of the seat belt 24 in the longitudinal direction at the slip joint 26. Thereby, since the speed of breathing and heartbeat of crew member 16 can be detected directly, the speed of breathing and heartbeat of crew member 16 can be detected with high accuracy. Further, the sensor 48 and the sensor 70 may be configured to measure the movement acceleration in the longitudinal direction of the seat belt 24 at the slip joint 26.

  Furthermore, in the said 1st Embodiment and 2nd Embodiment, although it was set as the structure which used the passage member of this invention as the slip joint 26, it is good also as a structure which used the passage member of this invention as the belt guide or the rerouter. . The belt guide is fixed to the upper portion of the seat 18 so as not to move in a state where the seat belt 24 is inserted so as to be movable in the longitudinal direction. On the other hand, the rerouter is provided in the upper part of the seat 18 so that the seat belt 24 can be moved in the longitudinal direction, and can be expanded and contracted in the front and rear direction, and can be moved in the left and right directions and the up and down direction. The path can be adjusted (set) in the front-rear direction, the left-right direction, and the up-down direction.

DESCRIPTION OF SYMBOLS 10 Seatbelt displacement detection apparatus 12 Vehicle 16 Crew 16C Chest 24 Seatbelt 26 Slip joint (passing member)
48 sensors (detection means, photographing means)
50 Control board (detection means)
60 Seat belt displacement detection device 66 Compression coil spring (pressing means)
68 Detection roller (detection means, moving member)
70 sensor (detection means)
72 Control device (detection means)

Claims (5)

A seat belt to be worn by a vehicle occupant;
A passing member through which the seat belt is movably passed;
A detecting means provided on the passing member for detecting at least one of the breathing and heartbeat of the occupant by detecting movement of the seat belt, and detecting the occupant's biological state;
A seat belt displacement detection device comprising:   2. The seat belt displacement detection device according to claim 1, wherein the detection unit includes a photographing unit that photographs the seat belt, and detects movement of the seat belt based on an image of the seat belt photographed by the photographing unit.   The seat belt displacement detection device according to claim 2, wherein the photographing unit photographs an enlarged image of the seat belt.   The seat belt displacement detection device according to claim 1, wherein the detection means includes a moving member that is moved by the movement of the seat belt, and detects the movement of the seat belt based on the movement of the moving member.   The seat belt displacement detection device according to claim 4, further comprising pressing means for pressing the seat belt to contact the moving member.

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