JPWO2013080369A1 - Load detection device - Google Patents

Abstract

In order to provide a load detection device that improves the detection accuracy of the occupant's load with a simple and low-cost configuration, at least three sensors that contact the seating side surface of the vehicle seat pad member and detect the load on the pad member are provided. A film-shaped load detection device including a detection unit and a connection unit that connects the detection unit, and is connected to the connection unit in a sensing region S surrounded by at least three detection units, and is downward in the sensing region. And a tail portion extending downward from the seating surface of the seat pad member and having a derivation portion at the lower end for deriving a load signal detected by the detection portion.

Description

  The present invention relates to a load detection device that is installed on a vehicle seat and detects a seated state of an occupant.

  2. Description of the Related Art Conventionally, in order to improve the performance of various safety devices such as seat belts and airbags installed in automobiles, there is a technique for detecting a state in which an occupant is seated on a vehicle seat and controlling these safety devices. As a load detection device suitable for detecting the seating state of such an occupant, there is a thin and flexible film-like membrane switch.

  For example, according to the prior art disclosed in Patent Document 1, the six pressure-sensitive parts 11a that constitute the membrane switch and detect the load contact the occupant's buttocks on the seating surface of the vehicle seat when the occupant is seated. It arrange | positions so that the load by a passenger | crew's weight may be detected suitably. A connection portion 11c is disposed forward from the sensing range surrounded by the six pressure sensing portions 11a, and is connected to the wiring 12 at a position that is not significantly affected by the weight of the occupant. The wiring 12 is inserted into a through-hole penetrating downward through the pad of the vehicle seat. The wiring 12 is disposed on the back surface of the pad, and is connected to the vehicle-side connector and the vehicle seat below and electrically connected to the control unit.

JP 2002-65396 A

  In the seating sensor configured as described above, the connecting portion 11c is disposed between the sensing range in which the weight of the occupant is received and the wiring 12 that is not significantly affected by the weight of the occupant. For this reason, the pad sinks in the sensing range, but the pad does not sink much at the connection position with the wiring 12, so that a step is generated between them, and the connection portion 11c is affected by the step. As a result, the accuracy of the output value may be affected.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a load detection device that improves the detection accuracy of a passenger's load with a simple and low-cost configuration.

  In order to solve the above problem, the invention of the load detection device according to claim 1 includes at least three detection units that contact the seating side surface of the vehicle seat pad member and detect a load on the pad member; A film-shaped load detection device, wherein the detection unit is connected to the connection unit in a sensing region surrounded by the at least three detection units, and is connected to the connection unit. A tail portion having a lead-out portion that is bent downward and extends downward from the seating surface of the seat pad member and that derives a load signal detected by the detection portion at the lower end.

  According to a second aspect of the present invention, there is provided the load detecting device according to the first aspect, wherein an R-shaped notch is provided in a root portion of the tail portion connected to the connecting portion in the sensing region.

  According to a third aspect of the present invention, there is provided the load detection device according to the first or second aspect, wherein the film-shaped load detection device includes four of the detection units, and the connection unit includes the four detection units. Of these, a first connecting part that connects two detecting parts, a second connecting part that connects the remaining two detecting parts, and a first connecting part that connects the first connecting part and the second connecting part at the center of each other. And the tail portion is connected to the central portion of the third connecting portion.

  According to a fourth aspect of the present invention, there is provided the load detecting device according to the third aspect, wherein an R-shaped notch is provided at a base portion of the third connecting portion connected to the first connecting portion and the second connecting portion. .

  The invention of a load detection device according to a fifth aspect is the load detection device according to any one of the first to fourth aspects, wherein the tail portion is a lead-out portion and is connected to a harness having a socket.

  According to a sixth aspect of the present invention, there is provided the load detecting device according to the fifth aspect, wherein the harness and the socket penetrate through the center portion of the seating surface of the vehicle seat pad member and penetrate the back surface of the pad member. The harness is routed on the back surface of the vehicle seat pad member, and the socket is connected to the vehicle-side connector.

  According to a seventh aspect of the invention, in the sixth aspect, the through hole is formed such that a bending angle of the tail portion becomes an obtuse angle when the tail portion is inserted.

  An invention of a load detection device according to an eighth aspect is the invention according to the sixth or seventh aspect, wherein an inlet portion of the through hole on the seating surface side of the vehicle seat pad member has both side surfaces opposed to the through hole. It is formed so as to close and close.

  The invention of a load detection device according to a ninth aspect of the present invention is the load detection device according to any one of the sixth to eighth aspects, wherein the part of the seating side surface of the vehicle seat pad member crosses the third connection portion. A recessed groove is formed in a recessed manner, the through hole is formed in the bottom of the recessed groove, and a bent portion formed by bending at least a part of the third connecting portion is inserted into the recessed groove, The tail portion is bent and inserted through the through hole.

  According to the invention according to claim 1 configured as described above, in the load detection device, the tail portion is bent and disposed below in the sensing region surrounded by at least three detection portions. For this reason, when the occupant sits in the sensing area on the seating surface of the pad member of the seat, the sensing area and the tail portion located in the sensing area sink simultaneously by the same amount. As a result, no step due to the pad sinking occurs in the portion arranged on the seating surface of the tail portion, so that no deformation due to the step occurs and there is no possibility that the accuracy of the output value decreases. Further, since the tail portion is bent and disposed below in the sensing area, the sensor can be miniaturized and the cost can be reduced.

  According to the invention of claim 2, since the R-shaped notch is provided at the base of the tail connected to the connecting part in the sensing region, the bending position of the tail is brought closer to the connecting part. However, the base portion of the tail portion can be favorably bent without causing wrinkles or kinks, and an accurate output can be ensured.

  According to the invention which concerns on Claim 3, a load detection apparatus is provided with four detection parts, and the 1st connection part which connects two detection parts, and the 2nd connection part which connects the remaining two detection parts are provided. In the center part of each other, they are connected by the third connecting part. And the tail part is connected with the center part of the 3rd connection part. In this manner, by arranging the detection unit, each connecting unit, and the tail unit, the downward bending position of the tail unit can be easily arranged in the sensing region.

  According to the invention which concerns on Claim 4, the R-shaped notch is provided in the root part of the 3rd connection part which connects a 1st connection part and a 2nd connection part. As a result, even when the vicinity of the base portion of the third connecting portion is bent and disposed in the vehicle seat, it is possible to prevent the base portion of the third connecting portion from being wrinkled or twisted, and to bend well. And accurate output can be secured.

  According to the invention which concerns on Claim 5, a tail part is connected to the harness provided with the socket in the derivation | leading-out part. Thereby, since the position of a socket can be freely set by changing the pulling-out direction of a harness, it can respond to various models of a vehicle seat.

  According to the invention which concerns on Claim 6, a harness is routed through the through-hole to the back surface of the pad member for vehicle seats, and a socket is connected with a vehicle side connector. Thereby, since it is not necessary to route the harness to the rear of the pad member and then route it to the back surface of the pad member and connect it to the vehicle-side connector, the harness can be shortened and the cost can be reduced.

  According to the invention which concerns on Claim 7, the through-hole is drilled so that the bending angle of a tail part may become an obtuse angle when a tail part is penetrated. As a result, the possibility of disconnection at the bent part of the tail part is reduced, and the tail part length and harness length can be adjusted by adjusting the bending angle, so that various seats can be used, so the load detection device can be shared. Can be achieved.

  According to the invention which concerns on Claim 8, the entrance part of the through-hole in the seating surface side of the pad member for vehicle seats is formed so that the both side surfaces which a through-hole oppose may close and close. Thereby, there is no possibility of feeling a foreign object even if the buttock abuts the through hole when the occupant is seated.

  According to the ninth aspect of the invention, the bent portion formed by bending at least a part of the third connecting portion is inserted into the concave groove, and the tail portion is bent to the through hole formed in the concave groove bottom portion. It is inserted. By doing in this way, the same effect as the case where it does not have a ditch | groove is acquired also in the load detection apparatus provided with the ditch | groove and comprised so that a ditch | groove might be crossed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an overall configuration of a vehicle seat showing a state in which a load detection device according to the present invention is attached to a vehicle seat. It is a cushion part top view of the vehicular seat concerning a 1st embodiment. FIG. 3 is a partially broken enlarged view of FIG. 2. It is IV-IV sectional drawing (4 places) of FIG. It is a top view of the load detection apparatus (sitting sensor) which concerns on this invention. It is VI-VI sectional drawing of FIG. It is VII-VII sectional drawing of FIG. It is sectional drawing of the modification 1 of a through-hole equivalent to the VII-VII sectional drawing of FIG. It is sectional drawing of the modification 2 of the through-hole equivalent to the VII-VII sectional drawing of FIG. It is a cushion part top view of a vehicular seat in the state without a skin concerning a 2nd embodiment. It is XI-XI sectional drawing of FIG. It is a figure of the modification of the ditch | groove which concerns on 2nd Embodiment. It is sectional drawing corresponded in the VII-VII sectional position in FIG. 2, Comprising: It is a figure which shows the modification 3 of a through-hole.

  Hereinafter, a first embodiment in which a load detection device for a vehicle seat according to the present invention (hereinafter referred to as a seating sensor) is applied to a vehicle seat 2 will be described with reference to the drawings. In addition, the directions of “front and rear, left and right, up and down” used in this specification are described with reference to the vehicle.

  As shown in FIG. 1, the vehicle seat 2 includes a cushion portion 4, a film-like seating sensor 8, and a seat back portion 6. As shown in FIGS. 2 and 3, the cushion portion 4 is made of cloth (or vinyl leather or leather) that is mounted so as to cover a pad member 10 made of urethane or the like and an upper surface that is a seating side surface of the pad member 10. And the like). On the upper surface of the pad member 10 of the cushion portion 4, as shown in FIG. The concave groove 14 has side walls 14a, 14a and a bottom surface 14b (see FIG. 4).

  As shown in FIG. 4, a mooring member 16, which is a metal wire, is embedded in the pad member 10 below the bottom surface 14 b of the groove 14 along the groove 14. However, the anchoring member 16 may be embedded in the width direction (left-right direction) of the cushion portion 4 and may intersect the concave groove 14 at a predetermined position without being embedded along the concave groove 14.

  As shown in FIGS. 2 and 4, a portion of the skin member 12 where the locking member 20 is fitted is located at a predetermined position where the anchoring member 16 is embedded in the concave groove 14 (in this embodiment, a cross section). 4), and the anchoring member 16 and the locking member 20 are connected by the fixing ring 18 at the exposed portion 52 as shown in FIG. Secure along. Thus, the concave groove 14 is a groove (hanging groove) formed to suspend the skin member 12. In addition, since the fixing position of the mooring member 16 shown in FIG. 2 is an example, what kind of position to fix is arbitrary.

  As shown in FIGS. 1 to 3, the seating sensor 8 (load detection device) is a membrane switch and is disposed between the pad member 10 and the skin member 12 covering the pad member 10. As shown in the plan view of FIG. 5, the seating sensor 8 has contacts A to D that are four detection units that detect the load on the pad member 10 by the back surface coming into contact with the seating side surface of the pad member 10. , A sensing region S (two-dot chain line portion) surrounded by the contacts A to D is formed. Further, the seating sensor 8 includes a first connecting portion 24 that connects two contacts A and B among four contacts (detecting portions), and a second connecting portion 26 that connects the remaining two contacts C and D. And a third connecting portion 28 that is connected to both the central portion of the first connecting portion 24 and the second connecting portion 26 at both ends. The seating sensor 8 is connected to the center of the third connecting portion 28, bends downward in the sensing region S, extends downward from the seating surface of the pad member 10, and has contacts AD at the lower end (detecting portions). A tail portion 30 having a derivation portion 29 for deriving a load signal detected by the above-described method, and a harness 31 connected to the derivation portion 29 and having a socket 32 at an end portion. Hereinafter, in the seating sensor 8, the side that contacts the seating side surface of the pad member 10 is referred to as the back surface, and the side that contacts the skin member 12 is referred to as the surface.

  As described above, the four contact points A to D as the detection unit are arranged in a rectangular shape at predetermined positions to form the sensing region S. At this time, the arrangement position on the seating surface of the cushion portion 4 in the sensing area S corresponds to the substantially central portion of the seating surface of the cushion portion 4 as shown in FIG. 2, and when the occupant sits, It is in a position where it comes into contact and a load based on the weight of the occupant is applied. Thus, the center part of the seating surface shall mean the center part of the range where the occupant's buttocks abut and apply a load when the occupant is seated.

R-shaped cutouts 30 a and 30 a are provided at the base portion of the tail portion 30 connected to the center portion of the third connecting portion 28. Thereby, even if the bending position of the tail part 30 is brought close to the third connecting part, the base part of the tail part 30 can be favorably bent without generating wrinkles or kinks, and an accurate output can be secured. In addition, four R-shaped notches 28b are also provided at the roots of the third connecting portion 28 connected to the central portions of the first connecting portion 24 and the second connecting portion 26, respectively. However, the R-shaped notches 30a and 30a and the four R-shaped notches 28b are not necessarily provided, and one or both of them may be omitted.
The harness 31 is electrically connected to a lead-out portion 29 included in the tail portion 30 and includes a socket 32 at an end portion. The lead-out unit 29 is a connection terminal for electrically connecting the detection unit (contacts A to D) and the harness 31. The socket 32 outputs a load detected by the detection unit (contacts A to D), and an output electrode (not shown) is formed. The socket 32 is connected to a connector (not shown) on the vehicle side in front of the space below the cushion portion 4. The connector is connected to an unillustrated ECU (Electronic Control Unit) that determines the seating state of the occupant.

  The seating sensor 8 is formed in a film shape by polymerizing a pair of upper and lower films, not shown, via an insulating spacer. The upper film and the lower film are thin-walled films made of a resin material such as polyethylene naphthalate (PEN), and the outer shape of the tail portion 30 excluding the contacts A to D and the connecting portions 24, 26, 28 and the lead-out portion 29. I am doing. The insulating spacer is made of, for example, a resin such as polyethylene terephthalate (PET), has an outer shape that substantially conforms to the shape of the upper film and the lower film, and is provided with a circular opening at a position corresponding to the contact.

  In each of the contacts A to D, a circular upper electrode (not shown) disposed on the upper film and a circular lower electrode (not illustrated) disposed on the lower film are concentric with the opening interposed therebetween. Are provided so as to face each other. When a load greater than the set value is applied in the thickness direction at the contact portion, the upper electrode and the lower electrode are brought into contact with each other and turned on, and a current flows to detect an input of the load greater than the set value. The electrodes of the contacts A to D are connected to the electrodes of the socket 32 by the connecting portions 24, 26, 28, the tail portion 30 and the harness 31. In the present embodiment, the load input is detected when the contact A and the contact B or the contact C and the contact D are simultaneously turned on. However, it is not limited to this mode, and the load is applied when the contact A and the contact D or the contact B and the contact C are turned on at the same time, or when each contact A, B, C, and D is turned on independently. The input may be detected.

  In order to fix the seating sensor 8 to the seating side surface of the pad member 10, a double-sided tape (not shown) is applied to the back surface of the seating sensor 8 or an adhesive (adhesive) is applied. In the present embodiment, the double-sided tape 34 is not attached to the back surfaces of the contacts A to D, and is mainly attached to the back surfaces of the connecting portions 24, 26, and 28. Thereby, each connection part 24,26,28 is reliably fixed to the seating side surface of the pad member 10 by adhesion | attachment of a double-sided tape, and the seating discomfort produced by the shift | offset | difference of the seating sensor 8 and the pad member 10 is suppressed. Further, since the double-sided tape is not provided on the tail portion 30, even if the pad member 10 of the cushion portion 4 sinks, the tail portion 30 can move (slide) in the vertical direction in a through hole 43 described later. In addition, in this embodiment, although the double-sided tape is not affixed on the back surface of contact AD, you may affix on the back surface of contact AD. This also sufficiently secures the input load detection sensitivity of the contacts A to D.

  Next, the through-hole 43 formed by penetrating from the seating surface to the back surface of the pad member 10 will be described with reference to the VI-VI cross-sectional views of FIGS. 6 and FIG. 7 to FIG. 13 to be described below, it should be noted in advance that the skin member 12 is not shown in the drawing and is omitted. As shown in FIGS. 2 and 3, the through hole 43 is formed by penetrating from the seating surface of the pad member 10 to the back surface in the sensing region S of the seating sensor 8 in the substantially central portion of the seating surface of the pad member 10. ing. When the seating sensor 8 is disposed on the seating surface of the pad member 10, the through-hole 43 faces the socket 32, the harness 31, and the tail portion 30 (including the lead-out portion 29) from the seating surface to the back surface of the pad member 10. It is a hole to be inserted through. When these are inserted, the lead-out portion 29 is located in the middle of the through hole 43, and the harness 31 protrudes from the back surface of the pad member 10 and is routed on the back surface. Accordingly, the harness 31 can be freely arranged on the back surface of the pad member 10 and can be freely combined with various vehicle-side connectors.

  The through-hole 43 is formed in a rectangular shape in a top view by opposing wall surfaces 43a and 43a (corresponding to both side surfaces of the present invention) and wall surfaces 43b and 43b orthogonal to the wall surfaces 43a and 43a. As shown in FIG. 7, at the upper part on the seating surface side of the wall surfaces 43a, 43a, the wall surfaces 43a, 43a have convex portions 43aa, 43ab, respectively, and the convex portions 43aa, 43ab approach each other and intersect with each other. It is formed so as to close the entrance of the. And the tail part 30 is penetrated by the clearance gap part of this intersection part. When the tail part 30 including the socket 32, the harness 31 and the lead-out part 29 is inserted between the convex parts 43aa and 43ab, the convex parts 43aa and 43ab are spread out by hand and then the leading part between the convex parts 43aa and 43ab. It is assumed that the socket 32 is gradually inserted while being pushed. Thereby, since the through-hole 43 does not have a large gap when viewed from the upper surface, even when the occupant is seated, a sense of foreign matter is not felt. In addition, in this embodiment, although the cross-sectional shape of the wall surfaces 43a and 43a of the through-hole 43 was made into the shape shown in FIG. 7, it is not restricted to this, It shows in FIG. 8 (modification 1) and FIG. 9 (modification 2). With such a shape, the opposite wall surfaces 43a, 43a (both side surfaces) of the through-hole 43 may be brought close to each other to close the inlet portion of the through-hole 43. The same effect can be expected by this.

  Next, the operation of mounting the seating sensor 8 according to the present invention will be described. When the occupant sits on the upper surface of the pad member 10 via the skin member 12, the portion where the seating sensor 8, which is the center of the seating surface of the pad member 10 with which the occupant's buttocks abuts, is sunk, and the seating sensor 8 Obtains a good load signal based on the weight of the passenger. At this time, the tail portion 30 (including the socket 32 and the harness 31) of the seating sensor 8 is bent in the center portion of the seating surface of the pad member 10 and in the sensing region S, and is directed downward to the back surface of the pad member 10. It is inserted through a through-hole 43 that is drilled through. As a result, the tail part 30 (and the socket 32 and the harness 31) sinks in the sensing region S by the same amount as the contact points A to D (detection part) and the connection parts 24, 26, and 28. For this reason, a step due to a difference in sinking amount does not occur between the sensing region S and the tail portion 30 on the seating surface of the pad member 10. As a result, there is no step in any part of the seating sensor 8 and no deformation due to pulling, wrinkling, or twisting occurs, so the seating sensor 8 can detect each contact AD (detection unit) with high accuracy. A signal can be output.

  When the occupant is seated on the seating surface of the vehicle seat 2, one or more of the contact A and the contact B or the contact C and the contact D are turned on, and the seating sensor 8 is a circuit configured by the seating sensor 8. An electric current flows, and the ECU determines that a person is seated on the seat cushion portion 4 (the load is more than a specified load) based on the seating detection signal based on the current. Thereby, for example, the operation of the airbag apparatus is made possible, or a warning that the seat belt is not worn is issued.

  As apparent from the above description, according to the first embodiment, the seating sensor 8 (load detection device) has the tail portion 30 bent in the sensing region S surrounded by the four detection portions A to D. And disposed below. For this reason, when the occupant is seated on the seating surface of the pad member 10 of the vehicle seat 2, the sensing region S and the bent portion of the tail portion 30 sink simultaneously by substantially the same amount. Therefore, there is no step between the sensing region S and the tail part 30 due to the difference in the amount of sinking of the pad member 10, so there is no possibility that the tail part 30 is deformed and the accuracy of the output value is lowered. Further, since the tail portion 30 is bent and disposed below in the sensing region S, the seating sensor 8 (load detection device) can be reduced in size, and the length of the tail portion 30 can be shortened, thereby reducing the cost. .

  Further, according to the first embodiment, since the R-shaped cutouts 30a and 30a are provided in the base portion of the tail portion 30 connected to the third connecting portion in the sensing region S, the seating sensor 8 is Even if the bending position of the tail part 30 is brought close to the third connecting part 28 for downsizing, the tail part 30 can be bent well without causing wrinkles or kinks at the root part, and an accurate output can be obtained. It is done.

  In addition, according to the first embodiment, the seating sensor 8 includes four detection units, and the first connection unit 24 that connects the two detection units A and B and the remaining two detection units C and D. The 3rd connection part 28 is connected by the mutual center part of the 2nd connection part 26 to connect. A tail portion 30 is connected to the central portion of the third connecting portion 28. Thus, by arranging the detection parts A to D and the connecting parts 24, 26, 28 in an H shape, the downward bending position of the tail part 30 can be easily arranged in the sensing region S area.

  Further, according to the first embodiment, the tail portion 30 is connected to the harness 31 having the socket 32 by the lead-out portion 29. Thereby, since the arrangement | positioning can be performed with the harness 31 in the back surface of the pad member 10, the position of the socket 32 can be freely set with the pulling-out direction of the harness 31, and it can respond to the vehicle seat of various models.

  Moreover, according to 1st Embodiment, the harness 31 is routed through the through-hole 43 in the back surface of the pad member 10, and the socket 32 is connected with a vehicle side connector (not shown). Thereby, since it is not necessary to route the harness 31 to the back of the pad member 10 and then connect the harness 31 to the vehicle side connector, the harness 31 can be shortened and the cost can be reduced.

  Further, according to the first embodiment, the entrance portion of the through hole 43 on the seating surface side of the pad member 10 is formed so that the opposite side surfaces 43 a and 43 a of the through hole 43 are close to each other. Thereby, when a passenger | crew seats, there is no possibility of feeling a foreign material in a buttocks.

  Next, a second embodiment will be described. In the second embodiment, a recessed groove 64 disposed in the width direction is recessed in a part of the upper surface of the pad member 10 of the cushion portion 4 as shown in FIG. Since the action of the concave groove 64 is the same as that of the concave groove 14 described in the first embodiment (hanging groove), detailed description thereof is omitted.

  The recessed groove 64 according to the second embodiment is disposed so as to cross the third connecting portion 28 of the seating sensor 8. The concave groove 64 is formed across the concave groove 14 in the width direction of the pad member 10 in the inner peripheral portion of the concave groove 14. Further, the concave groove 64 is disposed at a substantially central portion in the front-rear direction of the seating surface of the pad member 10, and substantially coincides with a position where the occupant's buttocks abuts when the occupant is seated and the weight of the occupant is applied. Others are the same as those in the first embodiment, and thus description thereof will be omitted, and only changes will be described. In addition, the same parts are described with the same reference numerals.

  As shown in FIG. 10, the third connecting portion 28 of the seating sensor 8 is disposed so as to extend in the front-rear direction across the recessed groove 64. Further, as shown in the cross-sectional view of FIG. 11, a bent portion 28 a configured by bending a part of the third conductive portion 28 is inserted so as to contact the bottom portion 64 a of the concave groove 64. At this time, the pad member 10 is provided with a tapered portion 10a so as to introduce the bent portion 28a into the bottom portion 64a. In addition, the position in the longitudinal direction of the bent portion 28a is adjusted so that the bottom portion 64a of the concave groove 64 is also brought into contact with the back surface of the tail portion 30 connected to the third conducting portion 28 at the same time.

  Four R-shaped notches 28b are provided at the base of the third connecting portion 28 connected to the first connecting portion 24 and the second connecting portion 26 of the seating sensor 8 (see FIGS. 5 and 10). . As a result, even if the bent portion 28a formed by bending and curving the vicinity of the base portion of the third connecting portion 28 is inserted into the concave groove 64, the root portion of the third connecting portion 28 is caused by wrinkles or kinks. It can be bent well without deformation, and an accurate output can be obtained.

  At this time, as in the first embodiment, the bottom 64a of the concave groove 64 is formed with a through hole 73 in the center of the seating surface of the pad member 10 in the top view and in the sensing region S. It penetrates the back surface (see FIG. 11). The tail portion 30 (including the socket 32 and the harness 31) is inserted into the through hole 73. As a result, the tail portion 30 (including the socket 32 and the harness 31) causes each contact point A to D (detection portion) and each connection portion 24 within the sensing region S when the occupant sits on the seating surface of the seat cushion 4. Although it is slightly different from 26 and 28, it sinks by substantially the same amount. For this reason, no step is generated in the portion where the tail portion 30 is disposed on the bottom portion 64a of the concave groove 64, so that the tail portion 30 is not deformed, and therefore each contact point AD is accurately obtained. The detection signal of the (detection unit) can be output.

  In the second embodiment, the concave groove 64 is arranged so as to extend in the width direction of the pad member 10, but the present invention is not limited to this, and the concave groove 84 extends in the front-rear direction as shown in FIG. You may arrange so. Also at this time, the seating sensor 8 is arranged so that the third connecting portion 28 crosses the recessed groove 84, and the bottom surface 84 a of the recessed groove 84 has a seating surface of the pad member 10 in a top view as in the second embodiment. And a through hole 93 is formed in the sensing region S and penetrates the back surface of the pad member 10. The tail portion 30 (including the socket 32 and the harness 31) is inserted into the through hole 93. The same effect can be expected by this.

  As is apparent from the above description, in the second embodiment, the third connecting portion 28 of the seating sensor 8 is disposed so as to cross the concave grooves 64 and 84, and a part of the third connecting portion 28 is curved. The configured bent portion 28 a is inserted into the concave grooves 64 and 84. The tail portion 30 is also inserted into the concave grooves 64 and 84, and is inserted into the through holes 73 and 93 formed in the bottom portions 64a and 84a of the concave grooves 64 and 84. Thus, also in the configured seating sensor 8, the same effect as that of the first embodiment can be expected.

  In the first and second embodiments, the through holes 43, 73, and 93 are formed so as to be substantially orthogonal to the seating surface. However, the present invention is not limited thereto, and as shown in Modification 3 of the through-hole shown in FIG. 13, when the tail portion 30 is inserted into the through-hole, the through-hole 103 is formed so that the bending angle of the tail portion 30 becomes an obtuse angle. It may be provided (see FIG. 13). As a result, the possibility of disconnection at the bent portion of the tail portion 30 can be reduced. Further, the length from the tail portion 30 to the socket 32 can be adjusted by configuring the tail portion 30 so that the bending angle is an obtuse angle. As a result, it is possible to adjust the length of the vehicle-side connectors arranged at various positions to a favorable length, so that it is possible to deal with various vehicle seats and to share the seating sensor.

  Further, in the first and second embodiments, the seating sensor 8 (sitting detection device) is arranged with the four contact points A to D as a detection unit in a rectangular shape, but is not limited thereto, for example, The three contact points A to C, which are detection parts, may be arranged in a triangle and connected by a connecting part, and the tail part may be connected at a point arranged in the sensing region S. Moreover, you may arrange | position five or more detection parts. In this case as well, the tail portion may be connected to the connecting portion at a point arranged in the sensing region S. The same effect can be expected by these.

  The load detection device according to the present invention is suitable for detecting that an occupant is seated on a cushion portion of a vehicle seat.

DESCRIPTION OF SYMBOLS 2 ... Vehicle seat, 4 ... Cushion part, 6 ... Seat back, 8 ... Load detection apparatus (seating sensor), 10 ... Pad member, 12 ... Skin member, 14, 64, 84 ... Concave groove, 14a, 64a ... Bottom part, 24 ... 1st connection part, 26 ... 2nd connection part, 28 ... 3rd connection part, 28a ... Curve part, 29 ... Derivation part, 30 ... Tail part, 31 ... Harness, 32 ... Socket, 43, 73, 93 , 103 ... through-holes, A to D ... detection part (contact point), S ... sensing area.

In order to solve the above problem, the invention of the load detection device according to claim 1 includes at least three detection units that contact the seating side surface of the vehicle seat pad member and detect a load on the pad member; A film-shaped load detection device, wherein the detection unit is connected to the connection unit in a sensing region surrounded by the at least three detection units, and is connected to the connection unit. bent downward, the cabling from the seating side table surface before Kipa head member to the back side of the pad member is inserted through the through holes provided to penetrate to the back surface in the sensing area, the lower end And a tail portion having a derivation portion for deriving a load signal detected by the detection portion.

Claims (9)

At least three detectors that contact the seating side surface of the pad member for a vehicle seat and detect a load on the pad member;
A connecting part for connecting the detecting part;
A film-shaped load detection device comprising:
In the sensing area surrounded by the at least three detection parts, the connection part is connected, bent downward in the sensing area, extends downward from the seating surface of the seat pad member, A load detection device including a tail portion having a derivation unit for deriving a load signal detected by the detection unit. In claim 1,
A load detection device in which an R-shaped notch is provided at a base portion of the tail portion connected to the connecting portion in the sensing region. In claim 1 or claim 2,
The film-shaped load detection device includes four detection units,
The connecting portion includes a first connecting portion that connects two detecting portions of the four detecting portions and a second connecting portion that connects the remaining two detecting portions;
A third connecting part for connecting the first connecting part and the second connecting part at the center of each other;
The load detecting device, wherein the tail portion is connected to a central portion of the third connecting portion. In claim 3,
A load detection device in which an R-shaped notch is provided at a base portion of the third connection portion connected to the first connection portion and the second connection portion. In any one of Claims 1 thru | or 4,
The tail portion is a lead-out portion, and is a load detection device connected to a harness having a socket. In claim 5,
The harness and the socket are inserted through a through-hole that penetrates the center portion of the seating surface of the vehicle seat pad member and penetrates the back surface of the pad member, and the harness is the back surface of the vehicle seat pad member. A load detection device that is arranged to be connected to the vehicle-side connector. In claim 6,
The through-hole is a load detection device that is formed such that a bending angle of the tail portion becomes an obtuse angle when the tail portion is inserted. In claim 6 or claim 7,
The load detection device, wherein the entrance portion of the through hole on the seating surface side of the vehicle seat pad member is formed so that both opposite side surfaces of the through hole are closed and closed. In any one of Claims 6 to 8,
A concave groove is formed in a recessed portion so as to cross the third connecting portion in a portion of the seating side surface of the vehicle seat pad member, and the through hole is formed in a bottom portion of the concave groove,
A load detecting device, wherein a bent portion formed by bending at least a part of the third connecting portion is inserted into the concave groove, and the tail portion is bent and inserted into the through hole.

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