JP2009107560A - Seating sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seating sensor capable of preventing erroneous detection to mistake as an occupant is seated when a luggage is placed while certainly detecting that an adult and a child are seated. <P>SOLUTION: This seating sensor 1 is furnished with a first sensor cell 11, a second sensor cell 12 connected to the first sensor cell 11 in series and arranged in front of a vehicle of the first sensor cell 11 and a third sensor cell 13 connected to the first sensor cell 11 in series, parallel connected to the second sensor cell 12 in parallel and arranged in the rear of the vehicle of the first sensor cell 11. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a seating sensor used for detecting that an occupant is seated on a vehicle seat, and more particularly to a seating sensor having a sensor cell that is conducted by a load of the occupant or the like.

  As a seating sensor, for example, there is one described in JP-A-10-39045 (Patent Document 1). The seating sensor described in Patent Literature 1 is disposed on a seating surface portion of a vehicle seat, and includes a plurality of sensor cells that are all connected in parallel. In this seating sensor, it is determined that one of the plurality of sensor cells is conducted and the occupant is seated.

  By the way, it is necessary to first detect that the occupant sitting on the vehicle seat is an adult or a child. For example, the range in which the load is applied to the seat surface when a child is seated is smaller than the range in which the load is applied to the seat surface portion when an adult is seated. In particular, a portion to which a large load is applied when an occupant is seated is a human buttocks. When the child is seated, the range in which the load is applied to the seat surface portion by the child's buttocks may be close to the rear side of the seat surface portion or near the center of the seat surface portion. On the other hand, when an adult is seated, the range in which the load is applied to the seat surface by the buttocks of the adult often extends mainly from the center of the seat surface to the entire rear side. However, even when an adult is seated near the front of the seating surface portion, the range in which the load is applied may mainly extend from the center of the seating surface portion to the entire front side.

  According to the seating sensor described in Patent Document 1, it is possible to detect whether the seated occupant is an adult or a child, and whether the seated state is any of the above. However, in this seating sensor, there are a large number of sensor cells, and for example, even when a load is placed on a vehicle seat, any sensor cell may be conducted, so that it is erroneously detected that an occupant is seated. There is a fear.

In order to solve this problem, there is a seating sensor described in Japanese Patent Laid-Open No. 2005-153556 (Patent Document 2). The seating sensor is disposed on the seat surface portion of the vehicle seat, and two sensor cells connected in series arranged in front of the vehicle on the seat surface portion and two sensors connected in series arranged on the rear side of the seat surface portion of the vehicle. A sensor cell. The two sensor cells arranged in front of the vehicle and the two sensor cells arranged in the rear of the vehicle are connected in parallel. According to this seating sensor, it is not determined that an occupant is seated unless at least two sensor cells arranged at the front or rear are simultaneously conducted. Also in Patent Document 2, detection is possible both when the seated passenger is an adult and when the child is a child.
Japanese Patent Laid-Open No. 10-39045 JP 2005-153556 A

  By the way, a load placed on a vehicle seat, such as a handbag, has a very small mass compared to a passenger. Therefore, if the load is placed so that a uniform force is applied to the seat surface portion of the vehicle seat, the possibility that the sensor cell becomes conductive is low. However, for example, when the luggage is placed on the seat surface portion while being held by the backrest portion, a so-called one-sided state is caused, and a large load may be applied to a part of the seat surface portion. For example, a large load may be applied to the vehicle rear portion of the seat surface portion. In such a case, in the seating sensor described in Patent Document 2, the two sensor cells on the rear side of the vehicle are simultaneously conducted, and there is a risk of erroneous detection due to luggage.

  The present invention has been made in view of such circumstances, and it is possible to erroneously detect that an occupant has been seated by placing a load while reliably detecting that an adult or child has been seated. An object of the present invention is to provide a seating sensor that can be prevented.

The seating sensor of the present invention
In a seating sensor provided with a sensor cell that is disposed on a seating surface portion of a vehicle seat and is in contact with each other when two electrodes face each other when receiving a load.
The first sensor cell;
A second sensor cell connected in series to the first sensor cell and disposed in front of the vehicle of the first sensor cell;
A third sensor cell connected in series to the first sensor cell, connected in parallel to the second sensor cell, and disposed behind the vehicle of the first sensor cell;
It is characterized by providing.

  In other words, the seating sensor of the present invention is configured so that the occupant is seated when the first sensor cell and the second sensor cell are in a conductive state, or when the first sensor cell and the third sensor cell are in a conductive state. It is detected that

  Here, when an adult is seated, the buttocks of the adult are a considerably wide range from the vehicle center to the rear side. In this case, all of the first, second, and third sensor cells are in a conductive state. However, when an adult is seated near the front of the vehicle seat, the rear end of the vehicle is not subjected to a load from the adult buttocks. At this time, even if a load is not applied to the third sensor cell, at least the first and second sensor cells can be brought into conduction. Further, since the size of the child's buttocks is smaller than that of an adult, when the child is seated on the rear side of the vehicle seat, for example, the first and third sensor cells are connected, and the child is When seated forward, for example, the first and second sensor cells can become conductive. Thus, it can be reliably detected whether the occupant is an adult or a child, and whether the seating position is near the front of the vehicle or the rear of the vehicle.

  In addition, when a load is placed on the seat surface portion so as to be in a single-contact state, a range in which a large load is applied to the seat surface portion is, for example, a linear range parallel to the backrest portion. Here, according to the seating sensor of this invention, the 1st, 2nd, 3rd sensor cell is shifted | deviated and arrange | positioned in the vehicle front-back direction. Therefore, even if a large load is applied to the linear range parallel to the backrest portion due to the load, the first and second sensor cells are conductive at the same time, or the first and third sensor cells are conductive at the same time. Must not. As described above, even when the package is placed so as to be in a piece-to-piece state, according to the present invention, erroneous detection due to the package can be prevented.

  Moreover, in the seating sensor of the present invention, as a preferred aspect, the second sensor cell and the third sensor cell are arranged so as to be shifted from the left and right of the vehicle with respect to the first sensor cell. That is, the first sensor cell, the second sensor cell, and the third sensor cell are each shifted in the vehicle front-rear direction and also shifted in the vehicle left-right direction.

  Among these, as a first aspect, the second sensor cell is arranged to be shifted to the left or right of the vehicle with respect to the first sensor cell, and the third sensor cell is a vehicle with respect to the first sensor cell. It is shifted to the other of the left and right. As a second aspect, the second sensor cell and the third sensor cell are arranged so as to be shifted to either the left or right side of the vehicle with respect to the first sensor cell.

  In the first aspect described above, the first sensor cell, the second sensor cell, and the third sensor cell are each shifted in the vehicle front-rear direction and also shifted in the vehicle left-right direction. Furthermore, the second sensor cell and the third sensor cell are arranged in the opposite direction in the vehicle front-rear direction with respect to the first sensor cell, and are also arranged in the opposite direction in the vehicle left-right direction. For example, the second sensor cell, the first sensor cell, and the third sensor cell are arranged in this order from the front right side of the vehicle to the rear left side of the vehicle.

  Here, as described above, it is considered that a large load is applied to the linear range parallel to the backrest part as described above, but the linear range perpendicular to the backrest part is considered as described above. A state where a large load is applied is also conceivable. Even in such a case, as described above, the first, second, and third sensor cells are displaced in the left-right direction of the vehicle, thereby preventing erroneous detection due to luggage.

  In the 2nd aspect of this invention mentioned above, the 2nd sensor cell and the 3rd sensor cell are shifted | deviated and arrange | positioned with respect to the 1st sensor cell on the same side among the vehicle right and left.

  Even in this case, even when the load is in a single-contact state and a large load is applied to the linear range perpendicular to the backrest portion, the first, second, and third sensor cells are arranged in the vehicle lateral direction as described above. Misalignment due to baggage can be prevented by shifting the position.

Moreover, in the first aspect of the present invention described above, as a further preferred aspect, the seating sensor of the present invention includes:
Connected in series to the first sensor cell, connected in parallel to the second sensor cell and the third sensor cell, arranged in front of the vehicle of the first sensor cell, and left and right of the vehicle relative to the first sensor cell A fourth sensor cell arranged to be shifted to the other of
Connected in series to the first sensor cell, connected in parallel to the second, third, and fourth sensor cells, disposed behind the vehicle of the first sensor cell, and with respect to the first sensor cell And a fifth sensor cell arranged to be shifted to the left or right of the vehicle.

  Thus, even when the occupant is seated in the seat surface portion while being displaced in the left-right direction of the vehicle, it can be reliably detected. For example, when the occupant is seated on the left side of the vehicle and the front side of the vehicle, the first sensor cell and the second sensor cell are electrically connected, and when the occupant is seated on the right side of the vehicle and near the front of the vehicle, the first sensor cell When the fourth sensor cell is connected and the occupant is seated on the left side of the vehicle and the rear of the vehicle, the first sensor cell and the fifth sensor cell are connected and the occupant is seated on the right side of the vehicle and the rear of the vehicle. The first sensor cell and the third sensor cell are in a conductive state.

<First embodiment>
Next, the present invention will be described in more detail with reference to embodiments. The seating sensor 1 according to the first embodiment will be described with reference to FIGS. FIG. 1 is a plan view of the seating sensor 1. FIG. 2 is an enlarged cross-sectional view of a portion of the sensor cell 11 of the seating sensor 1. FIG. 3 is a plan view of the seating sensor 1 mounted on the vehicle seat 2 (viewed from above the vehicle). FIG. 4 is a circuit configuration diagram of the seating sensor 1.

  As shown in FIG. 1, the seating sensor 1 includes three sensor cells 11, 12, and 13, a connector 16, and conductive portions 17, 18, and 19 that conduct the sensor cells 11 to 13 and the connector 16. The Each of the sensor cells 11 to 13 is a part that functions as a switch that conducts when a load is received by an occupant or a luggage. The connector 16 includes two terminals connected to the sensor cells 11 to 13 through the conduction parts 17 to 19 and is connected to an occupant detection ECU mounted on the vehicle. The first conduction portion 17 is formed so as to extend linearly from the connector 16 to the third sensor cell 13. The second conducting portion 18 is formed in a straight line with the first conducting portion 17 and extends linearly from the third sensor cell 13 to the first sensor cell 11. The third conduction portion 19 is formed to be linear with the first and second conduction portions 17 and 18 and extend linearly from the first sensor cell 11 to the second sensor cell 12. That is, the second sensor cell 12, the first sensor cell 11, and the third sensor cell 13 are arranged in a straight line from the connector 16 side.

  A specific cross-sectional configuration of the seating sensor 1 will be described with reference to FIG. As shown in FIG. 2, the seating sensor 1 includes a first film 21, a second film 22, a first electrode 23, a second electrode 24, and a spacer 25. However, in the seating sensor 1, the site of the sensor cells 11 to 13 and the site of the conduction parts 17 to 19 have the same basic configuration, but the specific configuration is slightly different. Then, it demonstrates, clarifying the difference between the site | part of the sensor cells 11-13 and the site | parts of the conduction parts 17-19.

  The first film 21 has the outer shapes of the sensor cells 11 to 13 and the conduction portions 17 to 19. The first film 21 is made of PEN resin and is formed in a thin wall shape. The parts of the sensor cells 11 to 13 in the first film 21 have a substantially circular shape, and the parts of the conduction parts 17 to 19 are formed in a linear shape having a width smaller than the circular diameter. A connector 16 is coupled to the base end portion of the first film 21. The second film 22 is made of the same material and the same shape as the first film 21. The second film 22 is disposed to face the first film 21. Similar to the first film 21, the base end portion of the second film 22 is coupled to the connector 16.

  The first electrode 23 is formed on one surface of the first film 21 (the lower surface in FIG. 2). That is, the first electrode 23 is arranged above the first film 21 and the second film 22 in FIG. The first electrode 23 includes a silver layer 23a bonded to one surface of the first film 21 and a carbon layer 23b covering the surface of the silver layer 23a. And the 1st electrode 23 in the site | part of the sensor cells 11-13 is formed in the at least center part of the 1st film 21 which consists of circular shape. Moreover, the 1st electrode 23 in the site | part of the conduction | electrical_connection parts 17-19 is wired suitably according to the circuit to form.

  The second electrode 24 is formed on the surface of the second film 22 that faces the first electrode 23 (the upper surface in FIG. 2). That is, the second electrode 24 is disposed below the first film 21 and the second film 22 in FIG. The second electrode 24 includes a silver layer 24a adhered to one surface of the second film 22, and a carbon layer 24b covering the surface of the silver layer 24a. Furthermore, the carbon layer 24 b of the second electrode 24 is disposed separately from the first electrode 23. And the 2nd electrode 24 in the site | part of the sensor cells 11-13 is formed in the at least center part of the 2nd film 22 which consists of circular shape. That is, the 1st electrode 23 and the 2nd electrode 24 in the site | part of the sensor cells 11-13 are facing. Moreover, the 2nd electrode 24 in the site | part of the conduction | electrical_connection parts 17-19 is wired suitably according to the circuit to form.

  The outer shape of the spacer 25 is the same outer shape as the first film 21 and the second film 22. However, as shown by the broken line in FIG. 1, the spacer 25 is formed through the whole in the center in the width direction. Specifically, the penetration width of the sensor cells 11 to 13 in the spacer 25 is wider than the penetration width of the conduction portions 17 to 19. The spacer 25 is made of PET resin and is formed in a thin wall shape.

  The spacer 25 is interposed between the first electrode 23 and the second electrode 24. That is, in FIG. 2, a space sandwiched between the first electrode 23, the second electrode 24, and the spacer 25 is formed. Here, as described above, since the penetration width of the sensor cells 11 to 13 in the spacer 25 is wider than the penetration width of the conduction portions 17 to 19, the space of the sensor cells 11 to 13 is not affected. The width (the width in the left-right direction in FIG. 2) is wider than the width of the space in the conductive portions 17-19. Accordingly, in the sensor cells 11 to 13 where the space is wide, the first film 21, the second film 22, the first electrode 23, and the second electrode 24 are bent and deformed when receiving the compressive load in the vertical direction of FIG. 2. Thus, the first electrode 23 and the second electrode 24 come into contact with each other, and both the electrodes 23 and 24 become conductive. That is, the sensor cells 11 to 13 function as so-called switches in which the first electrode 23 and the second electrode 24 are electrically connected when receiving a compressive load. In addition, the said space in the conduction | electrical_connection parts 17-19 functions as a channel | path for air escape. That is, the space in the conduction parts 17 to 19 is for releasing the internal air when the space in the sensor cells 11 to 13 is compressed.

  Next, a state in which the seating sensor 1 described above is mounted on the vehicle seat 2 will be described with reference to FIGS. 3 (a) to 3 (d). Here, the thin coating part in FIG. 3A to FIG. 3D shows the range of the load that the seat surface part 2 a receives when the occupant sits on the vehicle seat 2. 3 is a portion corresponding to the occupant's buttocks, and the seat surface portion 2a applies a larger load than the thin portion corresponding to the thigh of the occupant in FIG. It is the range to receive.

  As shown in FIG. 3A, the seating sensor 1 is mounted on the seat surface portion 2 a of the vehicle seat 2. Specifically, it is disposed between the cushion of the seat surface portion 2a and the skin. More specifically, among the seating sensors 1, the sensor cells 11 to 13 are arranged at the vehicle rear side of the vehicle front-rear direction center portion of the seat surface portion 2a and at the vehicle left-right direction center portion. The connector 16 is disposed so as to be located behind the vehicle with respect to the sensor cells 11 to 13.

  And the thin coating part of Fig.3 (a) shows the case where an adult sits on the seat surface part 2a with the correct attitude | position, ie, the case where the adult's buttocks are located in the vehicle rear side of the seat surface part 2a. In this case, the seated adult buttock is positioned on the sensor cells 11 to 13 of the seating sensor 1. Therefore, when an adult sits on the vehicle seat 2 in a correct posture, all the sensor cells 11 to 13 are conducted. The adult here is assumed to be a small adult. Therefore, if it is a large adult, a load will be applied to the range beyond illustration.

  Moreover, the thin coating part of FIG.3 (b) shows the case where the adult seated the vehicle front side of the seat surface part 2a. In this case, the seated adult buttock is positioned on the first sensor cell 11 and the second sensor cell 12 of the seating sensor 1. Therefore, in this case, only the first sensor cell 11 and the second sensor cell 12 are conducted.

  Moreover, the thin coating part of FIG.3 (c) shows the case where the child seated on the seat surface part 2a with the correct attitude | position, ie, the case where the child's buttocks are located in the vehicle rear side of the seat surface part 2a. In this case, the seated child's buttocks are positioned on the first sensor cell 11 and the third sensor cell 13 of the seating sensor 1. Therefore, in this case, only the first sensor cell 11 and the third sensor cell 13 are conducted. The child here is assumed to be an average 6-year-old.

  Moreover, the thin coating part of FIG.3 (d) shows the case where the child seated to the vehicle front side of the seat surface part 2a. In this case, the seated child's buttocks are positioned on the first sensor cell 11 and the second sensor cell 12 of the seating sensor 1. Therefore, in this case, only the first sensor cell 11 and the second sensor cell 12 are conducted.

  Next, a circuit configuration diagram of the seating sensor 1 will be described with reference to FIG. As shown in FIG. 4, the 1st sensor cell 11 and the 2nd sensor cell 12, and the 1st sensor cell 11 and the 3rd sensor cell 13 are each connected in series. The second sensor cell 12 and the third sensor cell 13 are connected in parallel.

  Therefore, when the first sensor cell 11 and the second sensor cell 12 are conducted, the entire circuit is conducted. Also, when the first sensor cell 11 and the third sensor cell 13 are conducted, the entire circuit is conducted. Of course, even when the first sensor cell 11, the second sensor cell 12, and the third sensor cell 13 are turned on, the circuit as a whole is turned on.

  Next, the effect | action by the seating sensor 1 demonstrated above is demonstrated. When an adult occupant sits on the vehicle seat 2 in the correct posture, the occupant's buttocks press all the sensor cells 11 to 13 of the seating sensor 1 as shown in FIG. Therefore, in this case, all the sensor cells 11 to 13 are conducted, and both terminals of the connector 16 are conducted. That is, the occupant detection ECU connected to the connector 16 detects that both terminals of the connector 16 are conductive, and determines that the occupant is seated on the vehicle seat 2.

  Further, when the adult is not seated in the correct posture, specifically, even when seated in front of the vehicle as shown in FIG. 3B, at least the first sensor cell 11 and the second sensor cell 11 That is, the sensor cell 12 becomes conductive. The first sensor cell 11 and the second sensor cell 12 are connected in series, and both ends thereof are connected to both terminals of the connector 16. Therefore, also in this case, it is determined that an occupant is seated on the vehicle seat 2 with certainty.

  Further, when the child is seated in a correct posture, the child's buttocks presses the first sensor cell 11 and the third sensor cell 13, and the sensor cells 11 and 13 are conducted. The first sensor cell 11 and the third sensor cell 13 are connected in series, and both ends thereof are connected to both terminals of the connector 16. Therefore, also in this case, it is determined that an occupant is seated on the vehicle seat 2 with certainty.

  Further, when the child is seated in front of the vehicle, it is the same as the above-described case where the adult is seated near the vehicle. Therefore, also in this case, it is determined that an occupant is seated on the vehicle seat 2 with certainty.

  Here, for example, when the occupant is seated on the vehicle seat 2 but is not wearing a seat belt, the occupant detection ECU lights or blinks the warning lamp. The occupant detection information detected by the occupant detection ECU is transmitted to an airbag ECU that controls activation of an occupant protection device such as an airbag. When it is determined that the occupant is seated on the vehicle seat 2, the airbag ECU activates the occupant protection device when the vehicle collides with an external object.

  Also, consider the case where a load is placed on the vehicle seat 2. As described above, the state in which both terminals of the connector 16 of the seating sensor 1 are conducted is the state in which the first sensor cell 11 and the second sensor cell 12 are conducted, or the first sensor cell 11 and the third sensor cell 13. Is in a conductive state.

  Here, the aspect of the load placed on the vehicle seat 2 will be examined. For example, let us consider a case where a luggage such as a handbag is placed on the sensor cells 11 to 13 in the seat surface portion 2 a of the vehicle seat 2. At this time, when the load is placed so that an equal force is applied to the seat surface portion 2a, the sensor cells 11 to 13 do not conduct if the load is lighter than the occupant. Accordingly, both terminals of the connector 16 are not conducted. That is, the occupant detection ECU determines that the occupant is not seated on the vehicle seat 2.

  Further, for example, when the load is placed on the seat surface portion 2a so as to lean against the backrest portion, depending on the shape and size of the load, a large load is applied to a specific narrow spot-like range of the seat surface portion 2a. It may take. In this case, any one of the sensor cells 11 to 13 may be conducted. However, even if any one of the sensor cells 11 to 13 is conducted, both terminals of the connector 16 are not conducted unless the sensor cells 11 to 13 connected in series thereto are conducted. Therefore, also in this case, the occupant detection ECU determines that the occupant is not seated on the vehicle seat 2.

  Further, when the load is placed on the seat surface portion 2a in a state where it is leaned against the backrest portion, a large load may be applied to a linear range parallel or perpendicular to the backrest portion. In this case, a large load is applied to the seat surface portion 2a in a linear range in the vehicle left-right direction or a linear range in the vehicle front-rear direction. Here, the sensor cells 11 to 13 in the seating sensor 1 of the present embodiment are arranged so as to be shifted in the vehicle front-rear direction and are shifted in the vehicle left-right direction. Accordingly, even if a large load is applied to a linear range that is parallel or perpendicular to the backrest portion of the load, any of the sensor cells 11 to 13 may conduct, but the sensor cell 11 to conduct The possibility that the sensor cells 11 to 13 connected in series to 13 are conductive is extremely low. That is, in this case, the occupant detection ECU determines that the occupant is not seated on the vehicle seat 2.

  Here, the sensor cells connected in series are oriented obliquely with respect to the vehicle longitudinal direction. Therefore, it is unlikely that a large load is applied to the load in this direction. That is, it is possible to reliably prevent erroneous detection due to luggage.

  In the above-described embodiment, the sensor cells 11 to 13 of the seating sensor 1 are arranged so as to be shifted in the vehicle front-rear direction and shifted in the vehicle left-right direction. Here, in the case where the load is leaned against the backrest part and the seating surface part 2a is in a one-sided state, it is sufficiently conceivable that a large load is applied to the linear range parallel to the backrest part, but the straight line perpendicular to the backrest part It is lower than the parallel case that a large load is applied in the range of. Therefore, the sensor cells 11 to 13 of the seating sensor 1 may be arranged linearly in the vehicle longitudinal direction so as not to be displaced in the vehicle lateral direction. However, of course, it is better to displace the vehicle in the left-right direction because it is possible to consider the possibility that a large load is applied to the linear range perpendicular to the backrest due to the load.

<Second embodiment>
Next, the seating sensor 100 of 2nd embodiment is demonstrated with reference to FIG. 5 and FIG. FIG. 5 is a plan view of the seating sensor 100 mounted on the vehicle seat 2. FIG. 6 is a circuit configuration diagram of the seating sensor 100. In addition, the same code | symbol is attached | subjected about the same structure as 1st embodiment, and description is abbreviate | omitted.

  As shown in FIG. 5, the seating sensor 100 includes five sensor cells 101, 102, 103, 104, 105, a connector 16, and a conduction part 107. The sectional configuration of the seating sensor 100 is the same as the sectional configuration of the seating sensor 1 of the first embodiment.

  The second sensor cell 102 is arranged at a position that is forward of the vehicle and shifted to the left of the vehicle with respect to the first sensor cell 101. The third sensor cell 103 is disposed at a position forward of the vehicle with respect to the first sensor cell 101 and shifted to the right of the vehicle, and is disposed at the same position in the vehicle front-rear direction as the second sensor cell 102. The fourth sensor cell 104 is arranged at a position behind the first sensor cell 101 and shifted to the left of the vehicle, and is arranged at the same position as the second sensor cell 102 in the left-right direction of the vehicle. The fifth sensor cell 105 is arranged at a position behind the first sensor cell 101 and deviated to the right of the vehicle, is the same position as the third sensor cell 103 in the left-right direction of the vehicle, and the fourth sensor cell 104 and the same position in the vehicle front-rear direction. And when an adult sits down with the right posture, the buttocks of an adult are located in the position which presses all the sensor cells 101-105. In addition, the conduction part 107 conducts between the sensor cells 101 to 105 and between the sensor cells 101 to 105 and the connector 16.

  And as for these sensor cells 101-105, as shown in FIG. 6, the 1st sensor cell 101 and the 2nd, 3rd, 4th, 5th sensor cell 102-105 are each connected in series. The second, third, fourth, and fifth sensor cells 102 to 105 are connected in parallel. That is, when the first sensor cell 101 is conducted and any one of the second to fifth sensor cells 102 to 105 is conducted, both terminals of the connector 16 are conducted.

  In this case, the same effect as the effect of the seating sensor 1 in the first embodiment is obtained. Furthermore, even when the occupant is seated in the seat surface portion 2a while being displaced in the vehicle left-right direction, it can be reliably detected that the occupant is seated. For example, when an occupant sits on the front side of the vehicle and on the left side of the vehicle, the first sensor cell 101 and the second sensor cell 102 can conduct. That is, according to the seating sensor 100 of the second embodiment, the seating can be reliably detected not only when the occupant is seated while being displaced in the vehicle front-rear direction but also when the occupant is seated while being displaced in the vehicle left-right direction. Of course, detection is possible for both adults and children.

<Third embodiment>
Next, the seating sensor 200 of the third embodiment will be described with reference to FIGS. 7 and 8. FIG. 7 is a plan view of a state in which the seating sensor 200 is mounted on the vehicle seat 2. FIG. 8 is a circuit configuration diagram of the seating sensor 200. In addition, the same code | symbol is attached | subjected about the same structure as 1st embodiment, and description is abbreviate | omitted.

  As shown in FIG. 7, the seating sensor 200 includes six sensor cells 201, 202, 203, 204, 205, 206, a connector 16, and a conduction part 207. The sectional configuration of the seating sensor 200 is the same as the sectional configuration of the seating sensor 1 of the first embodiment.

  The second sensor cell 202 is arranged at a position that is forward of the vehicle and shifted to the right of the vehicle with respect to the first sensor cell 201. The third sensor cell 203 is disposed at a position behind the first sensor cell 201 and shifted to the right of the vehicle. The fourth sensor cell 204 is disposed at a position shifted to the right of the vehicle with respect to the first sensor cell 201 and is disposed at the same position in the vehicle left-right direction as the second and third sensor cells 202 and 203. The fifth sensor cell 205 is a position forward of the vehicle and shifted to the left of the fourth sensor cell 204, the same position as the first sensor cell 201 in the left-right direction of the vehicle, and the second sensor cell 205 The sensor cell 202 is disposed at the same position in the vehicle longitudinal direction. The sixth sensor cell 206 is a position behind the vehicle and shifted to the left of the fourth sensor cell 204, the same position as the first sensor cell 201 in the left-right direction of the vehicle, and the third sensor cell 206. The sensor cell 203 is disposed at the same position in the vehicle longitudinal direction. And when an adult sits down with the right posture, the buttocks of an adult are located in the position which presses all the sensor cells 201-206. The conducting portion 207 conducts between the sensor cells 201 to 206 and between the sensor cells 201 to 206 and the connector 16.

  And as for these sensor cells 201-206, as shown in FIG. 8, the 1st sensor cell 201 and the 2nd, 3rd sensor cells 202 and 203 are each connected in series. The second sensor cell 202 and the third sensor cell 203 are connected in parallel. That is, when the first sensor cell 201 is conductive and one of the second and third sensor cells 202 and 203 is conductive, both terminals of the connector 16 are conductive. Further, the fourth sensor cell 204 and the fifth and sixth sensor cells 205 and 206 are connected in series, respectively. The fifth sensor cell 205 and the sixth sensor cell 206 are connected in parallel. That is, when the fourth sensor cell 204 is conducted and any one of the fifth and sixth sensor cells 205 and 206 is conducted, both terminals of the connector 16 are conducted. In this case, there are substantially the same effects as the effects of the seating sensor 1 in the first embodiment.

1 is a plan view of a seating sensor 1. FIG. 2 is an enlarged cross-sectional view of a portion of a sensor cell 11 of a seating sensor 1. FIG. FIG. 3 is a plan view of the seating sensor 1 mounted on a vehicle seat 2 (viewed from above the vehicle). 2 is a circuit configuration diagram of a seating sensor 1. FIG. 2 is a plan view of a state in which a seating sensor 100 is mounted on a vehicle seat 2. FIG. 2 is a circuit configuration diagram of a seating sensor 100. FIG. 2 is a plan view of a state in which a seating sensor 200 is mounted on a vehicle seat 2. FIG. 2 is a circuit configuration diagram of a seating sensor 200. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,100,200: Seat sensor, 2: Vehicle seat, 2a: Seat surface part 11-13, 101-105, 201-206: Sensor cell 16: Connector, 17-19, 107,207: Conduction part 21: 1st film 22: second film 23: first electrode 23a: silver layer 23b: carbon layer 24: second electrode 24a: silver layer 24b: carbon layer 25: spacer

Claims (5)

In a seating sensor provided with a sensor cell that is disposed on a seating surface portion of a vehicle seat and is in contact with each other when two electrodes face each other when receiving a load.
The first sensor cell;
A second sensor cell connected in series to the first sensor cell and disposed in front of the vehicle of the first sensor cell;
A third sensor cell connected in series to the first sensor cell, connected in parallel to the second sensor cell, and disposed behind the vehicle of the first sensor cell;
A seating sensor comprising:   The seating sensor according to claim 1, wherein the second sensor cell and the third sensor cell are arranged so as to be shifted from the left and right of the vehicle with respect to the first sensor cell. The second sensor cell is arranged to be shifted to either the left or right side of the vehicle with respect to the first sensor cell,
The seating sensor according to claim 2, wherein the third sensor cell is arranged to be shifted to the other of the left and right sides of the vehicle with respect to the first sensor cell. Connected in series to the first sensor cell, connected in parallel to the second sensor cell and the third sensor cell, arranged in front of the vehicle of the first sensor cell, and left and right of the vehicle relative to the first sensor cell A fourth sensor cell arranged to be shifted to the other of
Connected in series to the first sensor cell, connected in parallel to the second, third, and fourth sensor cells, disposed behind the vehicle of the first sensor cell, and with respect to the first sensor cell A fifth sensor cell arranged to be shifted to the left or right of the vehicle;
A seating sensor according to claim 3.   The seating sensor according to claim 2, wherein the second sensor cell and the third sensor cell are arranged so as to be shifted to either the left or right of the vehicle with respect to the first sensor cell.