JP4598664B2 - Load detection sensor, seating device and headrest - Google Patents

Description

  The present invention relates to a load detection sensor, a seating device equipped with the load detection sensor, and a headrest.

  Conventionally, a load detection sensor is known. As shown in FIG. 10, the load detection sensor includes a comb-shaped first conductive path portion 6X disposed in the pressure-sensitive chamber 40X and a comb-tooth shape disposed in the pressure-sensitive chamber 40X. The second conductive path portion 8X (Patent Document 1). The first conductive path portion 6X is connected to the wiring 5X and to the second wiring 50X on the return side. The second conductive path portion 8X is connected to the wiring 7X and to the return-side wiring 70X. For this reason, in the wiring region 14X, four wirings (wiring 5X, wiring 50X, wiring 7X, wiring 70X) run in parallel.

The conduction switch portion 9X faces the first conductive path portion 6X and the second conductive path portion 8X through the space of the pressure sensitive chamber 40X. In this load detection sensor, when a load is input to the load detection sensor, the conduction switch portion 9X contacts both the comb-shaped first conductive path portion 6X and the second conductive path portion 8X, and the first conductive path. The portion 6X and the second conductive path portion 8X are conducted. Thereby, the input of the load is detected.
JP 11-297153 A

  In order to detect the failure of the load detection sensor, the wiring 5X is connected to the GND terminal 301 of the ECU 300 and the wiring 50X is connected to the terminal 304 on one end side of the disconnection detection resistor 308 as shown in FIG. In addition, the wiring 7X is connected to the SIG terminal 302 of the ECU 300, and the wiring 70X is connected to the terminal 303 on the other end side of the disconnection detection resistor 308. According to this, if the wirings 5X and 50X and the wirings 7X and 70X are disconnected, no current flows through the resistor, and the disconnection is detected. In this case, as shown in FIGS. 10 and 11, four wires are required in the wiring region 14X.

  For this reason, when the width dimension D3 in the wiring region 14X is restricted, if the number of wirings is large, the width of each wiring may be small. In this way, when the width of each wiring is small, the wiring is disconnected or the influence of the wiring printing variation becomes large.

  The present invention has been made in view of the above circumstances, and can reduce the number of wirings in the wiring region connected to the pressure-sensitive region, and increase the width of one wiring while securing the width dimension in the wiring region. It is an object of the present invention to provide an advantageous load detection sensor, seating device, and headrest.

(1) A load detection sensor according to aspect 1 includes a first base portion, a second base portion facing the first base portion, pressure-sensitive regions provided in the first base portion and the second base portion, In a load detection sensor provided with a wiring area connected to a pressure-sensitive area provided in one base part and a second base part,
The pressure sensitive region faces the first conductive path portion and the second conductive path portion provided on one of the first base portion and the second base portion, and the first conductive path portion and the second conductive path portion. Provided in the other of the first base portion and the second base portion, when the distance between the first base portion and the second base portion becomes relatively small, the first conductive path portion and the second conductive path portion And a continuity switch that can be electrically contacted,
The wiring region includes a first wiring having a disconnection detecting function connected to one of the first conductive path part and the second conductive path part, a second wiring having a disconnection detecting function connected to the one, and a first conductive It is connected to either one of the path part and the second conductive path part, and is configured by running in parallel with a third wiring that is sandwiched between the first line and the second line and does not have a disconnection detection function. Features.

  (2) The seating device according to aspect 2 is a seating device including a seating device main body on which a person is seated and a sensor that is provided on the seating device main body and detects the seating of the person. It is a detection sensor.

  (3) A headrest according to aspect 3 includes a headrest body attached to a seating device on which a person is seated, and a sensor provided on a side of the headrest body that faces the person's head to detect the person's head. In the headrest, the sensor is a load detection sensor according to the above aspect.

  (4) According to the load detection sensor, when the load acts on the load detection sensor, the distance between the first base portion and the second base portion becomes relatively small. As a result, the conduction switch unit is in electrical contact with the first conductive path unit and the second conductive path unit. As described above, when the first conductive path portion and the second conductive path portion become conductive, a load is detected.

  The wiring region includes a first wiring having a disconnection detecting function connected to one of the first conductive path part and the second conductive path part, a second wiring having a disconnection detecting function connected to the one, and a first conductive A third wiring that is connected to one of the path portion and the second conductive path portion and has no disconnection detection function sandwiched between the first line and the second wiring is configured to run in parallel. The first wiring and the second wiring have a disconnection detection function. For this reason, even if the first wiring and the second wiring are disconnected, the disconnection is detected. Since the third wiring does not have a disconnection detection function, even if the third wiring is disconnected, the disconnection of the third wiring is not directly detected.

  However, the third wiring not having the disconnection detection function is sandwiched between the first wiring having the disconnection detection function and the second wiring having the disconnection detection function. For this reason, when the third wiring is disconnected, one or both of the first wiring and the second wiring are effectively disconnected. Therefore, the disconnection of the third wiring is detected by detecting the disconnection of one or both of the first wiring and the second wiring. Furthermore, since the first wiring, the second wiring, and the third wiring run in parallel in the wiring area, the number of wirings in the wiring area can be reduced as compared with the prior art shown in FIGS. Therefore, even when the width dimension of the parallel wiring portion of the wiring region connected to the pressure sensitive region is restricted, the width per wiring in the wiring region can be increased.

  According to the present invention, there is provided a load detection sensor that can reduce the number of wirings in the wiring region connected to the pressure-sensitive region, and that is advantageous for increasing the width of each wiring while securing the width dimension in the wiring region. can do. Furthermore, a seating apparatus and a headrest having a load detection sensor that exhibits the above-described effects are provided.

  A load detection sensor according to the present invention includes a first base portion, a second base portion facing the first base portion, a pressure sensitive region provided in the first base portion and the second base portion, and a first base portion. And a wiring region provided in the second base portion and connected to the pressure sensitive region. The first base portion and the second base portion face each other and occupy the main element of the load detection sensor. The pressure sensitive area is an area where a load is input. The pressure sensitive region is provided in the second base portion so as to face the first conductive path portion and the second conductive path portion provided in the first base portion, and the first conductive path portion and the second conductive path portion. A conduction switch unit. When the distance between the first base portion and the second base portion becomes relatively small, the conduction switch portion can electrically contact the first conductive path portion and the second conductive path portion.

  The wiring region is a region in which wirings connected to the pressure sensitive region are run in parallel. The wiring region is configured by running the first wiring, the second wiring, and the third wiring in parallel. The first wiring has a disconnection detection function connected to one of the first conductive path portion and the second conductive path portion. The second wiring is connected to the one side and has a disconnection detection function. The third wiring is sandwiched between the first line and the second line, and is connected to one of the first conductive path part and the second conductive path part.

  The present invention can be exemplified by the following forms. One or more of the following forms can be used in combination.

  The other of the first conductive path portion and the second conductive path portion that is connected to the third wiring that does not have the disconnection detection function is in a dead end state in the pressure sensitive region. In this case, the third wiring does not have a disconnection detection function.

  -The width dimension of the wiring area is smaller than the width dimension of the pressure sensitive area. In this case, when an external force such as a torsional force acts on the load detection sensor, the wiring region can be preferentially deformed over the pressure-sensitive region having a sensing function. In this case, it is advantageous to protect the pressure sensitive region having a sensing function.

  When the interval between the first wiring and the third wiring adjacent to each other is L1, and the distance between the second wiring and the third wiring adjacent to each other is L2, L1 and L2 are respectively the first wiring The line width is set within 10 times. In this way, the first wiring, the second wiring, and the third wiring are parallel to each other. If the parallel running is performed in this way, it is considered that disconnection of the first wiring, the second wiring, and the third wiring occurs together when an excessive external force that causes disconnection acts on the wiring region. For this reason, if the first wiring and the second wiring have a disconnection detection function, it is considered that there is virtually no problem even if the third wiring does not have a disconnection detection function. Note that L1 and L2 can be appropriately set within, for example, within 7 times, within 5 times, within 3 times, within 2 times, or the like of the line width of the first wiring.

  • The load detection sensor is equipped with electrodes that form a capacitance sensor. In this case, the object can be detected based on the change in capacitance. The object can be detected based on the load and the capacitance change, and the detection accuracy can be increased.

  -It is equipped with a heat generating part for heating the load detection sensor or the holding part that holds it. The components of the load detection sensor may harden due to the low temperature. In this case, the propagation of the load changes, and the detection accuracy of the load detection sensor may be reduced. Therefore, if the load detection sensor or the holding portion for holding the load detection sensor is heated by the heat generating portion, the influence of low temperature curing can be reduced or avoided.

  -The load detection sensor which concerns on this invention can be utilized as a load detection sensor for vehicles, and can be utilized as a passenger | crew detection sensor which detects the passenger | crew of a vehicle. Further, the load detection sensor according to the present invention can be mounted on a headrest or a seat (including a child seat for a vehicle and a toilet seat device for a toilet). The headrest is attached to a chair or a vehicle seat to support a person's head. The headrest has a headrest main body attached to the seat and a sensor that is provided on the side of the headrest main body facing the human head and detects the human head. In the headrest, the sensor is the above-described load detection sensor. This load detection sensor detects a load caused by the head.

  The seating device includes a seating unit on which a person sits and a sensor that is provided on the seating unit and detects the seating of the person. The sensor is a capacitance sensor according to each aspect described above. In this case, the presence of the head of the person sitting on the seating device can be detected well. Examples of the seating device include a vehicle seat device (including a child seat), a wheelchair seating device, and a toilet seat device.

  The seating device has a seating body having a seat cushion facing the person's buttocks and a seat back facing the person's back, and a sensor provided on the seating body for detecting the load of the person. The load detection sensor. A human seating is detected by the load detection sensor. Examples of the seating device include a seat for a vehicle and a toilet seat device for a toilet. It has a toilet seat attached to the toilet and a sensor provided on the toilet seat for detecting a human load. This sensor is the above-described load detection sensor.

  The headrest includes a headrest body that is attached to the seating device, and a sensor that is provided on the side of the headrest body that faces the human head and detects information related to the human head. The sensor is a capacitance sensor according to each aspect described above. In this case, the presence of the person's head facing the headrest can be detected well. The headrest is attached to the seating device so as to support a person's head. The headrest is used for a vehicle seat device, a wheelchair seating device, an office desk chair, a reclining chair, a massage chair, and the like.

  Embodiment 1 of the present invention will be specifically described below with reference to FIGS. FIG. 1 is a sectional view showing the internal structure of the load detection sensor. FIG. 2 is a block diagram schematically showing the plane of the internal structure of the load detection sensor together with the wiring. FIG. 3 shows a disconnection detection mode of the load detection sensor. FIG. 4 shows a plan view of the internal structure of the load detection sensor. As shown in FIG. 1, the load detection sensor 1 is provided on the first base portion 2, the second base portion 3 facing the first base portion 2, and the first base portion 2 and the second base portion 3. Pressure-sensitive region 13. The first base portion 2 and the second base portion 3 are opposed to each other and form a main element of the load detection sensor 1, and are a film body (film) made of resin.

  As shown in FIG. 1, the pressure-sensitive region 13 includes a first conductive path portion 6 and a second conductive path portion 8 provided on the facing surface 2 s of the first base portion 2, and a first conductive path portion 6 and a second conductive path portion 2. A conduction switch portion 9 provided on the facing surface 3 s of the second base portion 3 so as to face the conductive path portion 8 is provided. The conduction switch unit 9 is disposed so as to face the pressure sensitive chamber 40. The conduction switch section 9 is formed by a film forming means (evaporation, sputtering, printing, etc.) for forming a conductive material.

  As shown in FIGS. 2 and 4, a wiring region 14 that is electrically connected to the pressure-sensitive region 13 is provided. When the distance LA (see FIG. 1) between the first base portion 2 and the second base portion 3 is relatively small, the pressure-sensitive region 13 is formed in the first conductive path portion 6 and the second conductive path portion 8. Electrical contact is possible. Thereby, the load input to the pressure sensitive area 13 of the load detection sensor 1 is detected. The spacer member 4 is interposed between the first base portion 2 and the second base portion 3 and has an inner wall surface 42 and an outer wall surface 43. The inner wall surface 42 has a circular shape that partitions the pressure-sensitive chamber 40 that forms a circular space. The spacer member 4 is fixed between the first base portion 2 and the second base portion 3 by an adhesive material 41.

  As shown in FIG. 2, the first conductive path portion 6 has a branched comb tooth structure. The first conductive path portion 6 is connected to the first wiring 5. The first conductive path portion 6 is connected to the second wiring 7 on the return side. Therefore, the 1st wiring 5 and the 2nd wiring 7 are connected in series. The second conductive path portion 8 is connected to the third wiring 10. As shown in FIG. 2, in the wiring region 14, the first wiring 5, the second wiring 7, and the third wiring 10 are running in parallel. Here, the first wiring 5 is a line having a disconnection detection function. The second wiring 7 is a line having a disconnection detection function. The third wiring 10 is a line that does not have a disconnection detection function. As shown in FIG. 2, the third wiring 10 that does not have a disconnection detection function has an end 10 m in the pressure-sensitive region 13 and is in a dead end state. In this case, the third wiring 10 connected to the second conductive path portion 8 does not have a disconnection detection function.

  FIG. 3 shows a circuit diagram of a disconnection detection mode of the load detection sensor 1 (when the first conductive path unit 6 and the second conductive path unit 8 are conducted by the conduction switch unit 9). As shown in FIG. 3, when the first conductive path unit 6 and the second conductive path unit 8 are conducted by the conduction switch unit 9, they can be regarded as resistors, and thus are illustrated as resistors. Each resistor is connected in parallel.

  In order to detect the failure of the load detection sensor 1 described above, as shown in FIG. 3, the first wiring 5 is connected to the GND terminal 301 of the ECU (control unit) 300 and the second wiring 7 is connected to a resistance 308 for detecting disconnection. Is connected to the terminal 304 on one end side. Further, the third wiring 10 is connected to the SIG terminal 302 of the ECU 300. Further, the intermediate wiring 11 is branched from the third wiring 10, and the intermediate wiring 11 is connected to the terminal 303 on the other end side of the disconnection detection resistor 308. According to this, in the conductive path connecting the GND terminal 301 of the ECU (control unit) 300, the first wiring 5, the second wiring 7, the terminal 304, the resistor 308, the terminal 303, the intermediate wiring 11, and the SIG terminal 302 of the ECU 300. When a disconnection occurs, no current flows through the disconnection detection resistor 308, and the disconnection is detected by the ECU 300. In other words, when the first wiring 5 or the second wiring 7 in the wiring region 14 is disconnected, no current flows through the disconnection detection resistor 308, and the disconnection is detected by the ECU 300. In the third wiring 10, the disconnection detecting function is not exhibited in the wiring portion 10 r ahead of the coupling point 10 p between the intermediate wiring 11 and the third wiring 10.

  As described above, according to this embodiment, the first wiring 5 and the second wiring 7 have a disconnection detection function. For this reason, if the first wiring 5 and the second wiring 7 are disconnected, the disconnection is detected by the ECU 300. As described above, since the third wiring 10 does not have a disconnection detection function, even if the third wiring 10 (wiring portion 10r) is disconnected, the disconnection of the third wiring 10 is not directly detected.

  However, according to the present embodiment, in the wiring region 14, the third wiring 10 that does not have the disconnection detection function is sandwiched between the first wiring 5 that has the disconnection detection function and the second wiring 7 that has the disconnection detection function. Running in parallel. It is considered that the disconnection form is caused by mechanical breakage of the first base portion 2 and the second base portion 3. In this case, when the third wiring 10 is disconnected, one or both of the first wiring 5 and the second wiring 7 are disconnected. Therefore, the disconnection of the third wiring 10 is detected by detecting the disconnection of one or both of the first wiring 5 and the second wiring 7. Thus, the disconnection of the third wiring 10 is indirectly detected.

  Further, according to the present embodiment, as shown in FIG. 4, the distance between the adjacent first wiring 5 and the third wiring 10 is L1, and the distance between the adjacent second wiring 7 and the third wiring 10 is set. When the interval is L2, L1 and L2 are set to be not more than the line width t1 of the first wiring 5, not more than the line width t2 of the second wiring 7, and not more than the line width t3 of the third wiring 10, respectively. As described above, the wirings in the wiring region 14 (the first wiring 5, the second wiring 7, and the third wiring 10) are parallel to each other. Here, when an excessive external force that causes disconnection acts on the wiring region 14, the probability that the disconnection of the first wiring 5, the second wiring 7, and the third wiring 10 will occur together as described above is extremely high. Become. That is, when disconnection occurs in the first wiring 5 or the second wiring 7, it is generally considered that no disconnection occurs in the third wiring 10. For this reason, although the 1st wiring 5 and the 2nd wiring 7 have a disconnection detection function, the 3rd wiring 10 does not have a disconnection detection function, and there is virtually no trouble.

  According to the present embodiment, as shown in FIG. 4, the width dimension D3 of the wiring region 14 is made smaller than the width dimension D2 of the pressure-sensitive region 13. The reason is as follows. This is because when an external force such as a torsional force acts on the load detection sensor 1, the wiring region 14 is preferentially deformed over the pressure sensitive region 13 in order to protect the pressure sensitive region 13 having a sensing function. Thus, if the width dimension D3 of the wiring region 14 connected to the pressure sensitive region 13 is restricted, the protection of the pressure sensitive region 13 having a sensing function can be improved, but the first wiring 5, the second wiring 7, The width dimension D1 (see FIG. 4) of the parallel wiring in which the three wirings 10 run side by side is necessarily limited.

  Further, according to the present embodiment, in the wiring region 14, the first wiring 5, the second wiring 7, and the third wiring 10 run in parallel with a total of three. Therefore, the number of wirings in the wiring region 14 can be reduced as compared with the conventional technique shown in FIGS. 10 and 11 (the number of wirings in the wiring region 14X is four). Therefore, even when the width dimension D1 of the parallel wiring in the wiring region 14 is restricted, the line width t1 of the first wiring 5, the line width t2 of the second wiring 7, and the third wiring 10 in the wiring region 14. It is advantageous to ensure a large line width t3. As a result, even when the width D1 of the wiring region 14 is restricted, the first wiring 5, the second wiring 7, and the third wiring 10 can be thickened to improve their mechanical strength. This is advantageous for preventing disconnection.

  Furthermore, according to the present embodiment, when the first wiring 5, the second wiring 7, and the third wiring 10 are formed by a film forming means such as printing, the first wiring 5, the second wiring 7, and the third wiring 10 are formed. Excessive thinning requires high film forming accuracy and high assembly accuracy, which increases the manufacturing cost. However, as described above, if the line width t1 of the first wiring 5, the line width t2 of the second wiring 7, and the line width t3 of the third wiring 10 in the wiring region 14 can be secured large, excessive film formation accuracy, An excessive assembly accuracy requirement can be avoided, which is advantageous in reducing the manufacturing cost.

  FIG. 5 shows a second embodiment. The present embodiment basically has the same configuration and operational effects as the first embodiment. According to the present embodiment, as shown in FIG. 5, a plurality of pressure sensitive regions 13A and 13B are arranged in parallel. A wiring region 14B is interposed between the pressure sensitive regions 13A and 13B. As a result, the wiring region 14A → the pressure sensitive region 13A → the wiring region 14B → the pressure sensitive region 13B are arranged in order.

  In this embodiment, the same operation and effect as in the first embodiment can be obtained. That is, since the first wiring 5 and the second wiring 7 have a disconnection detection function, even if the first wiring 5 and the second wiring 7 are disconnected, the disconnection is detected by the ECU 300. As described above, since the third wiring 10 does not have a disconnection detecting function, even if the third wiring 10 is disconnected, the disconnection of the third wiring 10 is not directly detected. However, according to the present embodiment, the third wiring 10 that does not have the disconnection detection function runs in parallel by being sandwiched between the first wiring 5 having the disconnection detection function and the second wiring 7 having the disconnection detection function. . It is considered that the disconnection form is caused by mechanical breakage of the first base portion 2 and the second base portion 3. In this case, when the third wiring 10 is disconnected, one or both of the first wiring 5 and the second wiring 7 are disconnected. Therefore, the disconnection of the third wiring 10 is detected by detecting the disconnection of one or both of the first wiring 5 and the second wiring 7. Thus, the disconnection of the third wiring 10 is indirectly detected.

  6 and 7 show a third embodiment. The present embodiment basically has the same configuration and operational effects as the first embodiment. According to the present embodiment, the load detection sensor 1 and the capacitance sensor 200 are integrally incorporated, and the load detection sensor 1 is integrally provided adjacent to the capacitance sensor 200. That is, according to this sensor, as shown in FIG. 7, an electrode 202 and a heat generating portion 204 that exhibit a capacitance sensor function are provided between the first base portion 2 and the second base portion 3. Yes. An intermediate portion 206 (resin material or rubber material) is provided between the electrode 202 and the heat generating portion 204. Then, as shown in FIG. 7, the second base portion 3 and the electrode 202 that exhibits the capacitance sensor function are sequentially formed from the side where the object M exists, that is, from the outside toward the inside along the arrow A1 direction. The intermediate layer 206, the heat generating part 204, and the first base part 2 are arranged in this order. In this case, since the electrode 202 is closer to the object M than the heat generating part 204 in distance, the heat generating part 204 is prevented from existing as an obstacle between the electrode 202 and the object M. Therefore, it is possible to prevent the heat generating portion 204 from shielding the electrode 202 as an obstacle. Therefore, it is advantageous for exerting a capacitance sensor function by the electrode 202.

According to the present embodiment, the heat generating unit 204 generates heat by being duty-controlled at a predetermined duty ratio by the pulse control circuit. According to the duty control, when the energization time to the heat generating unit 204 is t1, the energization stop time to the heat generating unit 204 is t2, and t _all is t1 + t2, the duty ratio means t1 / t _all . The ECU 300 executes the detection process by the capacitance sensor 200 during the energization stop time t2 to the heat generation unit 204, but does not execute the detection process by the capacitance sensor 200 during the energization time t1 to the heat generation unit. Thus, according to the present embodiment, the ECU 300 stops the heat generation function when detecting the object by the capacitance sensor function. For this reason, the electrostatic capacity sensor function by the electrode 202 is satisfactorily exhibited while avoiding the influence of energization to the heat generating portion 204.

  By the way, the characteristics (elasticity etc.) of the 1st base part 2 and the 2nd base part 3 may change (harden | cure) by the influence of low temperature. In this case, the detection accuracy of the load detection sensor 1 may be affected. In this regard, according to this embodiment, the first base portion 2 and the second base portion 3 can be warmed by the heat generating portion 204, and the characteristics (elasticity and the like) of the first base portion 2 and the second base portion 3 are improved. It can be secured. In particular, according to the present embodiment, as can be understood from FIG. 7, the first base portion 2, the heat generating portion 204, and the second base portion 3 are arranged so as to overlap each other in the thickness direction. This heat can be quickly transmitted to the first base portion 2 and the second base portion 3, and the first base portion 2 and the second base portion 3 can be effectively warmed.

  Depending on the material or manufacturing method of the heat generating part 204, the heat generating part 204 may have some rigidity. In this case, if the heat generating portion 204 is provided in the region where the load detection sensor 1 is provided, the load transmission varies due to the rigidity of the heat generating portion 204, and the detection accuracy of the load detection sensor 1 is affected. May give. In this regard, according to the present embodiment, as shown in FIG. 7, the heat generating portion 204 is not provided in the region where the load detection sensor 1 is provided. That is, the load detection sensor 1 and the heat generating unit 204 are not overlapped with each other and do not face each other. Therefore, even when the heat generating portion 204 has rigidity, it is possible to avoid affecting the detection accuracy of the load detection sensor 1.

  FIG. 8 shows a fourth embodiment. The present embodiment basically has the same configuration and effect as the third embodiment. A common code | symbol is attached | subjected to a common site | part. In the sensor mounted on the headrest 100, the load detection sensor 1 and the capacitance sensor 200 are integrally incorporated. The headrest 100 is used in a control system that protects a passenger's neck from whiplash in the event of a vehicle collision. As shown in FIG. 8, the headrest 100 includes a headrest main body 102 attached to a seat seat mounted on a vehicle or the like, and a sensor mounting surface 104 provided on the side of the headrest main body 102 facing the human head. Have. A large number of load detection sensors 1 according to the third embodiment described above are mounted on almost the entire area of the sensor mounting surface 104. When the disconnection of the first wiring 5 and the second wiring 7 is detected, the control device outputs a warning signal to the warning means.

  As shown in FIG. 8, the electrode 202 of the capacitance sensor 200 is provided on the sensor mounting surface 104. The capacitance sensor 200 detects the human head independently of the load detection sensor 1. The electrode 202 is made of a conductive material, and has a planar outer edge electrode portion 202a formed along the outer edge 104c of the sensor mounting surface 104 of the headrest body 102, and a planar shape formed inside the outer edge electrode portion 202a. Inner electrode portion 202b. As shown in FIG. 8, a large number of load detection sensors 1 are surrounded by the outer edge electrode portion 202a and the inner electrode portion 202b. Therefore, when a human head is present in the vicinity of the sensor mounting surface 104 of the headrest body 102, both the load detection sensor 1 and the capacitance sensor 200 independently detect the presence of the human head. This increases the reliability of the sensor.

  As described above, according to the load detection sensor 1, the number of wires in the wiring region 14 can be reduced as in the first embodiment. Therefore, it is possible to ensure a large line width per wiring while keeping the width dimension D1 of the wiring region 14 small. Thus, if the line width of the first wiring 5, the line width of the second wiring 7, and the line width of the third wiring 10 can be increased, it is advantageous for preventing disconnection. Furthermore, since the width dimension D1 of the wiring region 14 having a structure in which the first wiring 5, the second wiring 7, and the third wiring 10 run side by side can be suppressed to be small, the installation space for the electrode 202 of the capacitance sensor 200 can be reduced. Can be increased. Furthermore, since the width dimension D1 of the wiring region 14 can be suppressed to be small, the torsion acting on the load detection sensor 1 can be absorbed by the deformation of the wiring region 14 (width dimension D1), so that a pressure-sensitive region having a sensing function. It is possible to suppress the occurrence of excessive torsion in 13 and enhance the protection of the pressure sensitive region 13.

  As described above, the headrest 100 detects the presence or absence of the human head by detecting the load on the human head by the load detection sensor 1. Further, the capacitance sensor 200 detects the change in capacitance due to the approach of the person's head, thereby detecting whether or not the person's head is approaching. This makes it easier to detect the presence or absence of the head of the person using the headrest 100 and can further increase the accuracy of the sensor.

  Human hair is diverse. The hair may affect the sensitivity of the capacitance sensor 200 depending on conditions. In this regard, if the sensor mounting surface 104 is combined with sensing by the load detection sensor 1 and sensing by the capacitance sensor 200 as in the present embodiment, it is advantageous to avoid the above-described influence of hair and the like. It is.

  FIG. 9 shows a fifth embodiment. The present embodiment basically has the same configuration and effect as the first to fourth embodiments. A common code | symbol is attached | subjected to a common site | part. Hereinafter, a description will be given centering on the differences from the first to fourth embodiments. As shown in FIG. 9, a seating seat 400 as a seating device is used for a vehicle or the like, and has a seat cushion 401 that faces a human buttocks and a seat back 402 that faces a human back. It has a main body 403 and a sensor that is provided on the seat cushion 401 of the seating seat main body 403 and detects a human load. The sensor is the load detection sensor 1 according to each embodiment described above. The load detection sensor 1 is used as a seating sensor that detects seating on the seating seat 400. Note that the load detection sensor 1 according to each embodiment may be attached to the seat back 402.

  In addition, the present invention is not limited to the embodiments described above and shown in the drawings, and can be implemented with appropriate modifications within a range not departing from the gist.

  The present invention can be applied to a human body detection sensor, an occupant detection sensor and the like mounted on a vehicle seat, a toilet seat device, and the like.

It is sectional drawing which concerns on Example 1 and shows the internal structure of a load detection sensor. FIG. 3 is a configuration diagram schematically illustrating a plane of an internal structure of a load detection sensor together with wiring according to the first embodiment. It is a block diagram which shows the disconnection detection form of a load detection sensor concerning Example 1. FIG. It is a top view which concerns on Example 1 and shows the internal structure of a load detection sensor with wiring. FIG. 10 is a plan view illustrating an internal structure of a load detection sensor together with wiring according to the second embodiment. FIG. 10 is a plan view showing an internal structure of a sensor incorporating a load detection sensor and a capacitance sensor together with wiring according to the third embodiment. FIG. 6 is a cross-sectional view illustrating an internal structure of a sensor according to a third embodiment and incorporating a load detection sensor and a capacitance sensor. It is a front view which shows the state which concerns on Example 4 and has mounted the load detection sensor in the headrest main body. FIG. 10 is a configuration diagram illustrating a seating seat on which a load detection sensor is mounted according to the fifth embodiment. It is a top view which concerns on a prior art example and shows the internal structure of a load detection sensor with wiring. It is a block diagram which shows the disconnection detection form of a load detection sensor concerning a prior art example.

Explanation of symbols

  1 is a load detection sensor, 2 is a first base portion, 3 is a second base portion, 4 is a spacer member, 40 is a pressure sensing chamber, 42 is an inner wall surface, 4 is a spacer member, 5 is a first wiring, and 6 is a first wiring. 1 conductive path section, 7 second wiring, 8 second conductive path section, 9 conduction switch section, 10 third wiring, 13 pressure sensitive area, 14 wiring area, 200 capacitance sensor, 202 Denotes an electrode, and 204 denotes a heat generating portion.

Claims (8)

A first base portion; a second base portion facing the first base portion; a pressure-sensitive region provided in the first base portion and the second base portion; and the first base portion and the second base. In a load detection sensor provided with a wiring region provided in a portion and connected to the pressure-sensitive region,
The pressure-sensitive region includes a first conductive path portion and a second conductive path portion provided on one of the first base portion and the second base portion, and the first base portion and the second base portion. The first conductive path provided on the other of the first base portion and the second base portion so as to face each other when a distance between the first base portion and the second base portion is relatively small. And a conduction switch part capable of electrical contact with the second conductive path part,
The wiring region includes a first wiring having a disconnection detection function connected to one of the first conductive path portion and the second conductive path portion, a second wiring having a disconnection detection function connected to the one, and A third wiring that is connected to either one of the first conductive path portion and the second conductive path portion and has no disconnection detection function sandwiched between the first line and the second line is run in parallel. The load detection sensor characterized by being comprised.   The load detection sensor according to claim 1, wherein the other connected to the third wiring not having a disconnection detection function is in a dead end state in the pressure-sensitive region.   3. The load detection sensor according to claim 1, wherein the width dimension of the wiring area is smaller than the width dimension of the pressure sensitive area.   4. The gap between the first wiring and the third wiring that are adjacent to each other is defined as L <b> 1, and the spacing between the second wiring and the third wiring that are adjacent to each other according to claim 1. L1 and L2 are each set within 10 times the line width of the first wiring, where L2 is L2.   The load detection sensor according to claim 1, further comprising an electrode that forms a capacitance sensor.   The load detection sensor according to any one of claims 1 to 5, further comprising a heat generating portion. In a seating device comprising a seating device body on which a person is seated, and a sensor provided on the seating device body for detecting the seating of the person,
The said sensor is a load detection sensor as described in any one of Claims 1-6, The seating apparatus characterized by the above-mentioned. In a headrest comprising a headrest main body attached to a seating device on which a person is seated, and a sensor that is provided on a side facing the human head of the headrest main body and detects a human head,
The said sensor is a load detection sensor as described in any one of Claims 1-6, The headrest characterized by the above-mentioned.

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