JP2017190988A - Load detection sensor unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a load to be appropriately detected.SOLUTION: A load detection sensor unit 1 comprises a load detection sensor 5 which includes: a first electrode sheet 50 having a first electrode 52; a second electrode sheet 60 having a second electrode 62 disposed to face the first electrode 52; and a spacer 70 disposed between the first electrode sheet 50 and the second electrode sheet 60 and having an opening 71 between the first electrode 52 and the second electrode 62. The load detection sensor unit further comprises a fixing pin 33 as a first regulation member for regulating relative movement in a sheet surface direction of the spacer 70, and the first electrode sheet 50 and the second electrode sheet 60; and a housing 3, the fixing pin 33 and a locking claw 33X as second regulation members for regulating relative movement in a direction orthogonal to the sheet surface direction. The spacer 70 is not bonded to the first electrode sheet 50 and the second electrode sheet 60.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a load detection sensor unit, which is suitable for properly detecting seating and the like.

  As one of safety systems in vehicles, an alarm system for warning that a seat belt is not worn when riding is put into practical use. In this alarm system, a warning is issued when seat belt wearing is not detected while seating of a person is detected.

  As a load detection sensor for detecting a load caused by a seating of a person, for example, Patent Document 1 below is disclosed. In the load detection sensor of Patent Document 1 below, a spacer is disposed between a pair of films, the film and the spacer are bonded together by an adhesive layer, and the electrodes formed on the respective films are mutually connected in the opening of the spacer. Opposing each other with a predetermined interval. In such a load detection sensor, a pair of films are pressed according to the seating of the seat device, so that the electrodes formed on the film come into contact with each other, and a load caused by the seating is detected.

JP 2012-121363 A

  However, in the load detection sensor of the above-mentioned Patent Document 1, there is a tendency that the adhesive layer on which the film and the spacer are bonded is pressed and the adhesive layer in the peripheral portion of the opening of the spacer tends to be thin. In particular, it is assumed that the above tendency becomes higher when placed in an environment where the temperature is high, such as in a car under a hot sun.

  When the adhesive layer in the load detection sensor of Patent Document 1 is thinned, the distance between the electrodes facing each other through the opening of the spacer is reduced. For example, when a load caused by a load lighter than a person is applied. In addition, there is a risk of erroneous detection as a load caused by seating.

  Then, an object of this invention is to provide the load detection sensor unit which can detect a load appropriately.

  In order to solve the above problems, a load detection sensor unit of the present invention includes a first electrode sheet having a first electrode, a second electrode sheet having a second electrode opposed to the first electrode, and the first electrode sheet. And a load detection sensor having a spacer disposed between the second electrode sheet and having an opening between the first electrode and the second electrode, the spacer, the first electrode sheet, and the second electrode sheet, A first regulating member that regulates relative movement in the sheet surface direction in the sheet, and restricts relative movement in a direction orthogonal to the sheet surface direction in the spacer, the first electrode sheet, and the second electrode sheet. And the spacer, the first electrode sheet, and the second electrode sheet are non-adhered.

When a load is applied from the object to be detected to the load detection sensor unit of the present invention, the electrode sheet bends according to the load, and the first electrode and the second electrode separated by the spacer pass through the opening of the spacer. The load is detected by contact.
Here, the spacer, the first electrode sheet, and the second electrode sheet are not bonded, and there is no adhesive layer. For this reason, even when the load detection sensor unit is placed in an environment where the temperature is high, the adhesive layer is not pressed and the distance between the first electrode and the second electrode facing each other through the opening of the spacer changes. Is avoided. Therefore, erroneous detection of a load that is not within the load range to be detected due to the change in the interelectrode distance is avoided.
Further, the relative movement in the direction orthogonal to the sheet surface direction and the direction in the spacer and the first electrode sheet and in the spacer and the second electrode sheet is restricted. For this reason, even if the spacer is not bonded to the first electrode sheet and the second electrode sheet, the positional relationship between the first electrode and the second electrode facing each other through the opening of the spacer is avoided. The Accordingly, erroneous detection of a load that is not within the load range to be detected due to a change in the positional relationship between these electrodes can be avoided.
Thus, the load detection sensor unit can detect the load appropriately.

  The first restricting member and the second restricting member are preferably integrated.

  When the first restricting member and the second restricting member are integrated, a connecting member that connects the separate first restricting member and the second restricting member becomes unnecessary, which may cause deterioration of the connecting member over time. The resulting false detection can be eliminated. In addition to this, the load detection sensor unit can be reduced in size by the amount that does not require the connecting member.

  In addition, it is preferable that the spacer, the first electrode sheet, and the second electrode sheet each have a through hole, and the first restricting member is a pin inserted into the through hole.

  In this case, within the sheet surfaces of the first electrode sheet and the second electrode sheet, the spacer and the first electrode sheet, and the sheet surface direction of the spacer and the second electrode sheet and the relative direction in the direction orthogonal to the direction. Movement can be regulated. Therefore, the movement is regulated at a position closer to the first electrode and the second electrode, compared to the case where the first regulating member and the second regulating member are arranged outside the sheet surface direction side from the first electrode sheet and the second electrode sheet. For example, when the load is applied to the load detection sensor unit, it is possible to reduce the fact that the sheet portion in the vicinity of the electrode floats.

  It is preferable that the pin is a part of the second restriction member.

  In this case, since the pin also serves as a part of the second restricting member, the number of parts can be suppressed, and the load detection sensor unit can be further downsized accordingly.

  The second restricting member includes a mounting table on which the load detection sensor is mounted, the pin provided on the mounting table, and a locking member that locks the second electrode sheet on the tip side of the pin. It is preferable that it is comprised.

  In this case, the load detection sensor can be sandwiched between the mounting base on the base side of the pin and the locking member on the tip side of the pin. For this reason, even when vibration is applied to the load detection sensor unit, the relative movement in the direction perpendicular to the sheet surface direction of the spacer, the first electrode sheet, and the second electrode sheet is caused by the vibration. It is possible to prevent the regulations from being lifted or relaxed.

  The second electrode sheet is preferably made of a metal plate, the metal plate also serves as the second electrode, and the spacer and the metal plate are preferably not bonded.

  In such a case, since the influence of heat on the second electrode sheet is small, the sensitivity of the load detection sensor is stable even when used in a high temperature environment or a low temperature environment. Moreover, since a 2nd electrode sheet is a metal, damage etc. can be reduced and durability can be improved. Furthermore, the number of parts can be reduced by the amount that the metal plate also serves as the second electrode, and the size can be reduced.

  The second electrode sheet includes an insulating sheet having the second electrode, and a metal plate disposed on a surface of the insulating sheet opposite to a spacer side surface, and the insulating sheet; It is preferable that the spacer is not bonded.

  In this case, since the second electrode sheet has a metal plate that is less affected by heat, the sensitivity of the load detection sensor is stable even when used in a high temperature environment or a low temperature environment. Moreover, since the 2nd electrode sheet has a metal plate, damage etc. can be reduced and durability can be improved.

  As described above, according to the present invention, it is possible to provide a load detection sensor unit that can appropriately detect a load.

It is an exploded view which shows the structure of the load detection sensor unit in 1st Embodiment. It is sectional drawing which shows a mode that the load detection sensor unit was attached to S spring of a seat apparatus. It is an exploded view which shows the structure of a load detection sensor. It is sectional drawing in the XX line of the load detection sensor shown in FIG. It is sectional drawing in the YY line of the load detection sensor shown in FIG. It is sectional drawing which shows a part of load detection sensor of the state penetrated by the pin for fixing. It is a figure which shows the ON state of a load detection sensor. It is a figure which shows the state penetrated by the pin for fixation from the viewpoint similar to FIG. It is a figure which shows the structure of another 2nd electrode sheet.

  Hereinafter, a preferred embodiment of a load detection device according to the present invention will be described in detail with reference to the drawings. For ease of understanding, the scale of each figure may be different from the scale described in the following description.

(1) Embodiment FIG. 1 is an exploded view showing a configuration of a load detection sensor unit 1 in the first embodiment, and FIG. 2 is a cross-sectional view showing a state in which the load detection sensor unit 1 is attached to an S spring of a seat device. It is. FIG. 2 is a cross-sectional view of the load detection sensor unit 1 on a surface along the left-right direction of the seat, and the load detection sensor 5 is simplified in order to avoid complication of the drawing.

  As shown in FIGS. 1 and 2, the load detection sensor unit 1 includes a pedestal 2, a housing 3, a housing cover 4, and a load detection sensor 5 as main components.

  The pedestal 2 includes a placement portion 21 on which the housing 3 is placed, and a pair of hook portions 22 connected to the placement portion 21. The upper surface of the mounting portion 21 is a mounting surface 21S on which the housing 3 is mounted. Further, the mounting portion 21 is formed with a plurality of through holes 23 penetrating from the mounting surface 21S to the lower surface of the mounting portion 21 (the surface opposite to the mounting surface 21S). The pedestal 2 is formed by molding a metal plate, for example, and in this case, the plate thickness is set to 0.8 mm, for example.

  The pair of hook portions 22 are respectively provided at positions facing each other across the placement portion 21, and a pair of adjacent S springs among a plurality of S springs 90 stretched side by side in the opening of the frame in the vehicle seat device. Each is fitted into a spring 90. Accordingly, each hook portion 22 is a locking portion that locks the base 2 to the S spring 90. In the present embodiment, the pair of hook portions 22 are formed so as to be fitted in a pair of S springs 90 arranged in the lateral direction of the seat device and adjacent in the lateral direction. In addition, with the pair of hook portions 22 fitted in the pair of adjacent S springs 90 as described above, the placement portion 21 is positioned below the seat cushion SC placed on the plurality of S springs 90, Further, when the plurality of S springs are viewed from above, the placing portion 21 is disposed between the pair of S springs 90. With the pair of hook portions 22 fitted into the pair of S springs 90 as described above, the placement surface 21S is positioned below the lower end of each S spring 90 in the present embodiment.

  The housing 3 includes a connector 31 that is mechanically and electrically connected to an engine control unit that executes various processes based on signals output from the load detection sensor 5, and a switch housing portion 32 that is coupled to the connector 31. And have. The switch housing portion 32 has a bottom wall 37 and a frame wall 38, and a housing space CA for housing the load detection sensor 5 is formed by the bottom wall 37 and the frame wall 38. The bottom wall 37 is a mounting table on which the load detection sensor 5 is mounted. In the present embodiment, the sheet surface of the spacer 70, the first electrode sheet 50, and the second electrode sheet 60 of the load detection sensor 5. It is also one of the components of the 2nd control member which controls the relative motion of the direction orthogonal to a direction. In the present embodiment, the frame wall 38 is subjected to a blanking process in order to suppress deformation during resin molding.

  A pair of fixing pins 33 and a pair of connection pins 34 are provided on the bottom wall 37 of the switch housing portion 32. In the case of this embodiment, the fixing pin 33 and the connection pin 34 are formed integrally with the bottom wall 37. However, the fixing pin 33 and the connection pin 34 may be separate from the bottom wall 37.

  The pair of fixing pins 33 regulates the relative movement in the sheet surface direction between the spacer 70 of the load detection sensor 5 placed on the bottom wall 37, the first electrode sheet 50, and the second electrode sheet 60. It is a regulating member. In the present embodiment, the component of the second regulating member that regulates the relative movement in the direction orthogonal to the sheet surface direction in the spacer 70 of the load detection sensor 5 and the first electrode sheet 50 and the second electrode sheet 60. There is also one. In other words, in the present embodiment, the fixing pin 33 that is a first restricting member that restricts relative movement in the sheet surface direction restricts relative movement in a direction orthogonal to the sheet surface direction. It also serves as a part of the member. Locking claws 33 </ b> X that are locking members for locking the second electrode sheet 60 disposed on the tip end side of the pins are provided on the side surfaces of the fixing pins 33.

  The locking claw 33X is a component of a second regulating member that regulates relative movement of the spacer 70 of the load detection sensor 5, the first electrode sheet 50, and the second electrode sheet 60 in a direction orthogonal to the sheet surface direction. It is one of. The locking claw 33X of the present embodiment is formed integrally with the fixing pin 33 that is the first restricting member. Further, the locking claw 33X of the present embodiment has flexibility, and the through holes 55C, 55D, 65C, 65D, 75C, and 75D formed in the load detection sensor 5 are used as a pair of fixing pins 33. When inserted, it is elastically deformed along the side surface of the fixing pin 33. On the other hand, when the load detection sensor 5 is inserted to the base side of the fixing pin 33, the locking claw 33X returns to the state of protruding from the side surface of the fixing pin 33, and the load detection sensor 5 is moved to the base side. It is designed to hold down on.

  The pair of connection pins 34 are electrically connected to the corresponding connector terminals of the connector 31 and are electrically connected to the load detection sensor 5. In FIG. 3, the connector terminals of the connector 31 are omitted.

  A pair of projecting pieces 35 are provided on the outer surface of the frame wall 38 of the switch housing portion 32. In the present embodiment, the pair of protruding pieces 35 are provided so as to be arranged in the lateral direction of the seat. In addition, a plurality of hook pieces 36 that are fitted into the respective through holes 23 of the base 2 are provided at the lower end of the frame wall 38. The respective hook pieces 36 are fitted into the respective through holes 23 of the pedestal 2, whereby the housing 3 is fixed to the pedestal 2 and placed on the placement surface 21 </ b> S of the housing 3 as described above. An upper surface of the bottom wall 37 of the switch housing portion 32 in the housing 3 is a mounting surface on which the load detection sensor 5 is mounted.

  The housing cover 4 is a lid member that covers the accommodation space CA of the switch accommodation portion 32, and has a top wall 47 and a frame wall 48. A pair of arms 41 is provided at the lower end of the frame wall 48 of the housing cover 4. Each arm 41 is formed with an opening 42 into which a projecting piece 35 provided on the frame wall 38 of the switch housing portion 32 in the housing 3 is fitted. The housing cover 4 is locked to the housing 3 by fitting the pair of projecting pieces 35 of the housing 3 into the respective openings 42 of the pair of arms 41. Accordingly, the pair of arms 41 sandwich the housing 3 from the lateral direction of the seat while the housing cover 4 is locked to the housing 3.

  The top wall 47 of the housing cover 4 is provided with a switch pressing portion 43 that protrudes from an inner surface facing the bottom wall 37 of the switch housing portion 32 in the housing 3. The switch pressing portion 43 has a curved surface shape with a convex tip, and when the housing cover 4 covers the housing 3 and each protruding piece 35 is fitted in each opening 42, the tip is the load detection sensor 5. In contact with the switch. In this state, as shown in FIG. 4, the top wall 47 of the housing cover 4 and the frame wall 38 of the housing 3 are separated from each other, and a gap GA is formed. In general, the seat cushion SC is made of foamed urethane resin. Therefore, examples of the material of the housing cover 4 include resins such as polycarbonate (PC), polyamide (PA), polybutylene terephthalate (PBT), phenol resin, and epoxy resin.

  By the way, in a state where the load detection sensor unit 1 is attached to the pair of S springs 90, the upper surface 47S of the top wall 47 of the housing cover 4 faces the lower surface of the seat cushion SC with a predetermined distance therebetween.

  The upper surface 47S is a pressure receiving surface that is pressed by the seat cushion SC, and is flat in this embodiment. Further, the entire upper surface 47S moves in the front-rear direction and the left-right direction with respect to the mounting surface 21S so that the angle of the upper surface 47S with respect to the mounting surface 21S changes when viewed along the mounting surface 21S direction of the pedestal 2. It is like that. However, since the pair of arms 41 of the housing cover 4 sandwich the housing 3 from the lateral direction of the seat device as described above, the angle at which the housing cover 4 rotates is larger in the front-rear direction than in the left-right direction of the seat. The Since the upper surface 47S is not divided, the entire upper surface 47S moves.

  Next, the load detection sensor 5 housed in the switch housing portion 32 of the housing 3 will be described.

  FIG. 3 is an exploded view showing the configuration of the load detection sensor 5. 4 is a sectional view taken along line XX of the load detection sensor 5 shown in FIG. 3, and FIG. 5 is a sectional view taken along line YY of the load detection sensor 5 shown in FIG.

  As shown in FIGS. 3 to 5, the load detection sensor 5 includes a first electrode sheet 50, a second electrode sheet 60, and a spacer 70 as main components.

  The 1st electrode sheet 50 has the insulating board | substrate 51 which does not have flexibility, for example. Examples of the material of the substrate 51 include phenol resin and epoxy resin. The first electrode 52 and the first contact portion 53 are disposed on one surface F1 of the substrate 51 that faces the second electrode sheet 60.

  The first electrode 52 is one electrode constituting the switch SW, and is, for example, a circular metal printing layer. The first contact portion 53 is formed by connecting a substantially rectangular contact area AR1 that is in contact with the second electrode sheet 60 and a non-contact area AR2 that is not in contact with the second electrode sheet 60 to each other.

  In the substrate 51, the other surface F2 opposite to the one surface F1 is a lower surface of the load detection sensor 5, and a parallel resistor R1 and a series resistor r1 are disposed on the other surface F2. The parallel resistor R1 and the series resistor r1 are chip resistors in this embodiment.

  The substrate 51 is formed with a plurality of through holes penetrating from one surface F1 to the other surface F2 of the substrate 51. The first sheet through hole 55A, the second sheet through hole 55B, and the fixing through hole 55C, respectively. , 55D and pin through holes 55E, 55F.

  55 A of 1st sheet | seat through-holes are sheet | seat through-holes in which opening is located in the area | region where the 1st electrode 52 is arrange | positioned among the one surfaces F1 of the board | substrate 51. FIG. A first conductive member CPA is provided in the first sheet through hole 55A, and the circuit portion and the first electrode 52 arranged on the other surface F2 of the substrate 51 via the first conductive member CPA. Are electrically connected. The first conductive member CPA is provided on the inner peripheral surface of the first sheet through hole 55A, and an air hole SP surrounded by the first conductive member CPA is provided in the first sheet through hole 55A. It is formed.

  The second sheet through hole 55 </ b> B is a sheet through hole in which an opening is positioned in a region where the first contact portion 53 is disposed on one surface F <b> 1 of the substrate 51. In the present embodiment, the opening of the second sheet through hole 55B is positioned in the non-contact area AR2 of the first contact portion 53.

  The second conductive member CPB is filled in the second sheet through hole 55B. The circuit part disposed on the other surface F2 of the substrate 51 and the non-contact area AR2 of the first contact portion 53 are electrically connected via the second conductive member CPB.

  The fixing through holes 55 </ b> C and 55 </ b> D are through holes through which a pair of fixing pins 33 provided on the bottom wall 37 of the switch housing portion in the housing 3 are inserted. The diameters of the fixing through holes 55 </ b> C and 55 </ b> D are approximately the same as the outer diameter of the pair of fixing pins 33.

  The pin through holes 55E and 55F are through holes through which the pair of connection pins 34 provided in the housing 3 are inserted. A terminal TLX1, which is one end portion of the electric circuit in the load detection sensor 5, is provided inside the pin through hole 55E, and the other end portion of the electric circuit in the load detection sensor 5 is provided in the pin through hole 55F. A terminal TLX2 is provided. A terminal TLX1 provided in the pin through hole 55E is electrically connected to the series resistor r1, and is electrically connected to the first contact portion 53 via the series resistor r1. Further, the terminal TLX2 provided in the pin through hole 55F is electrically connected to a contact point between the first electrode 52 and the parallel resistor R1, and is connected to the first contact part 53 via the parallel resistor R1. The terminals TLX1 and TLX2 are provided along the inner peripheral surfaces of the corresponding pin through holes 55E and 55F, and the width of the space surrounded by the terminals TLX1 and TLX2 is approximately the same as the outer diameter of the connection pin 34. It is said. When the pair of pin through holes 55E and 55F is inserted, the terminal TLX1 and one connection pin 34 are electrically connected, and the terminal TLX2 and the other connection pin 34 are electrically connected. These connection pins 34 are electrically connected to the corresponding connector terminals of the connector 31 (FIG. 1) as described above, and are connected to the engine control unit via a predetermined cable.

  The 2nd electrode sheet 60 has the metal plate 61, the 2nd electrode 62, and the 2nd contact part 63 as a main structure.

  The metal plate 61 is a thin metal sheet having flexibility. In the present embodiment, the metal plate 61 has a vertical width shorter than the vertical width of the substrate 51, and a thin rectangular parallelepiped shape having a horizontal width equivalent to the horizontal width of the substrate 51. It is said. The material of the metal plate 61 is not particularly limited as long as it is a metal, and examples thereof include copper and stainless steel.

  The metal plate 61 is formed with fixing through holes 65C and 65D penetrating from one surface of the metal plate 61 to the other surface. The fixing through holes 65 </ b> C and 65 </ b> D are through holes through which a pair of fixing pins 33 provided on the bottom wall of the switch housing portion in the housing 3 are inserted, and are formed in the substrate 51 of the first electrode sheet 50. It has the same shape and size as the holes 55C and 55D. Further, the arrangement positions of the second electrode 62 and the second contact portion 63 with respect to the fixing through holes 65C and 65D, and the first electrode 52 and the first contact portion 53 with respect to the fixing through holes 55C and 55D in the first electrode sheet 50 are provided. When the first electrode sheet 50 and the metal plate 61 are overlapped, the fixing through-hole 55C and the fixing through-hole 65C overlap each other, and the fixing through-hole 55D is fixed. The through hole 65D for use overlaps each other.

  The second electrode 62 is the other electrode constituting the switch SW. In the present embodiment, the second electrode 62 is a portion facing the first electrode 52 via the spacer 70 in the metal plate 61. That is, a part of the metal plate 61 also serves as the second electrode 62. For example, a metal layer made of the same material as or different from that of the metal plate 61 may be disposed as a second electrode 62 at a portion of the metal plate 61 that faces the first electrode 52 via the spacer 70.

  The 2nd contact part 63 is one member which comprises the connection maintenance part AP, and is formed as a leaf | plate spring in this embodiment. In other words, the metal plate 61 is provided with a pair of notches 61A and 61B (FIG. 1) extending from one end of the metal plate 61 toward the other end side with a predetermined interval therebetween, and these notches 61A and 61B ( A part sandwiched between the two parts shown in FIG. Further, the second contact portion 63 is bent toward the first electrode sheet 50 so that the second contact portion 63 is inclined with respect to the sheet surface of the metal plate 61, whereby the second contact portion 63 is It is formed as a leaf spring. In this way, a portion of the metal plate 61 that is different from the portion that is the second electrode 62 is the second contact portion 63. The position where the second contact portion 63 is formed is a position that overlaps the contact area AR1 of the first contact portion 53 when the first electrode sheet 50 and the second electrode sheet 60 are overlapped. The shape of the leaf spring formed as the second contact portion 63 may be, for example, a trapezoid whose base width is larger than the width of the open end, and various shapes other than a rectangle and a trapezoid are applicable. is there. Further, as the second contact portion 63, a metal layer made of the same material as or different from the metal plate 61 may be disposed on the first electrode sheet 50 side in the metal plate 61.

  The spacer 70 is a thin insulating member that is sandwiched between the first electrode sheet 50 and the second electrode sheet 60. In the present embodiment, the spacer 70 has substantially the same shape as that obtained by removing the second contact portion 63 from the metal plate 61. The same size. Examples of the material of the spacer 70 include resins such as PET, PI, and PEN.

  An opening 71 is formed in the spacer 70. The opening 71 is between the first electrode 52 disposed on the substrate 51 and the second electrode 62 of the metal plate 61 facing the first electrode 52, and the first electrode 52 and the second electrode 62 in the vertical direction. It is formed at a position overlapping the two electrodes 62. The size of the opening 71 is slightly smaller than the size of the first electrode 52.

  In addition, a slit-like opening 72 is formed in the spacer 70. The opening 72 is between the first contact portion 53 disposed on the substrate 51 and the second contact portion 63 of the metal plate 61 facing the first contact portion 53, and is the first contact in the vertical direction. It is formed at a position overlapping the portion 53 and the second contact portion 63. The size of the opening 72 is slightly larger than the size of the leaf spring formed as the second contact portion 63 in the metal plate 61.

  Further, the spacer 70 is formed with fixing through holes 75C and 75D penetrating from one surface of the spacer 70 to the other surface. The fixing through holes 75C and 75D are through holes into which the fixing pins 33 provided on the bottom wall of the switch housing portion in the housing 3 are inserted, and the fixing through holes 55C formed in the substrate 51 of the first electrode sheet 50. , 55D. Further, the arrangement portion of the opening 71 and the opening 72 with respect to the fixing through holes 75C and 75D in the spacer 70, and the arrangement portion of the first electrode 52 and the first contact portion 53 with respect to the fixing through holes 55C and 55D in the first electrode sheet 50. And have the same relative position. Therefore, when the first electrode sheet 50, the spacer 70, and the second electrode sheet 60 are overlapped, the fixing through hole 55C, the fixing through hole 65C, and the fixing through hole 75C are overlapped with each other, and the fixing through hole 55D is fixed. The through hole 65D and the fixing through hole 75C overlap each other.

  The first electrode sheet 50, the second electrode sheet 60, and the spacer 70 are overlapped to constitute the load detection sensor 5. The spacer 70 of the load detection sensor 5 is not bonded to the first electrode sheet 50 and the second electrode sheet 60. Also, as shown in FIG. 4, the first electrode 52 and the second electrode 62 face each other in a state of being separated from each other through the opening 71, thereby forming the switch SW. In a state where the first electrode 52 and the second electrode 62 are separated from each other, the distance between the first electrode 52 and the second electrode 62 is, for example, 0.1 mm. The air hole SP formed in the electrode through hole 52 </ b> A communicates with the opening 71. Therefore, when the second electrode 62 is bent and contacts the first electrode 52, unnecessary air can be discharged from the air hole SP to the outside of the load detection sensor 5. As described above, the first sheet through hole 55A is only a hole for electrically connecting the first electrode 52 disposed on the one surface F1 of the substrate 51 and the circuit portion disposed on the other surface F2 side. It also serves as an exhaust hole for discharging the air in the opening 71 to the outside of the load detection sensor 5.

  Further, as described above, in the load detection sensor 5, the second contact portion 63 of the second electrode sheet 60 is formed as a leaf spring, and is plastically deformed with respect to the sheet surface of the metal plate 61 so as to be always inclined. is there. Therefore, as shown in FIG. 5, the second contact portion 63 passes through the opening 72 formed by the notch of the spacer 70 and is connected to the contact area AR <b> 1 of the first contact portion 53 of the first electrode sheet 50. The Thus, the connection maintaining part AP is formed by the first contact part 53 and the second contact part 63 coming into contact with each other. That is, the first contact portion 53 of the first electrode sheet 50 is one member constituting the connection maintaining portion AP that maintains the electrical connection even when no external pressure is applied to the housing cover 4 of the load detection sensor unit SU. The second contact portion 63 of the second electrode sheet 60 is the other member constituting the connection maintaining portion AP.

  In such a load detection sensor 5, as shown in FIG. 3, the pair of fixing pins 33 in the housing 3 are fixed through holes 55 </ b> C and 55 </ b> D in the first electrode sheet 50, and fixed through holes 75 </ b> C and 75 </ b> D in the spacer 70. In addition, the second electrode sheet 60 is inserted through the fixing through holes 65C and 65D in order.

  FIG. 6 is a cross-sectional view showing a part of the load detection sensor 5 inserted into the fixing pin 33. Note that the fixing pins 33 and the locking claws 33X are not hatched so as to be easily distinguished from the substrate 51 of the first electrode sheet 50, the spacer 70, and the metal plate 61 of the second electrode sheet 60. As shown in FIG. 6, when the load detection sensor 5 is inserted into the fixing pin 33 that is the first restriction member, the first electrode sheet 50, the spacer 70, and the second electrode sheet 60 of the load detection sensor 5 are respectively The movement in the sheet surface direction is restricted by the fixing pin 33.

  The fixing pin 33 is provided on the bottom wall 37 of the housing 3 on which the load detection sensor 5 is placed, and the load detection sensor 5 inserted through the fixing pin 33 is provided on the fixing pin 33. It is sandwiched between the claw 33X and the bottom wall 37. For this reason, each of the first electrode sheet 50, the spacer 70, and the second electrode sheet 60 of the load detection sensor 5 is restricted from moving in a direction orthogonal to the sheet surface. That is, the second regulating member that regulates the relative movement in the direction orthogonal to the sheet surface direction of the spacer 70 of the load detection sensor 5 and the first electrode sheet 50 and the second electrode sheet 60 is fixed to the bottom wall 37. It is comprised by the pin 33 and the latching claw 33X.

  Thus, in a state where the movement of the load detection sensor 5 is regulated, the pair of connection pins 34 are inserted into the pin through holes 55E and 55F of the first electrode sheet 50, respectively, as shown in FIGS. The As a result, the terminals TLX1 and TLX2 provided in the pin through holes 55E and 55F come into contact with the corresponding connection pins 34 and are electrically connected to the connector terminals of the connector 31 of the housing 3 via the connection pins 34. . Further, by attaching the housing cover 4, the tip of the switch pressing portion 43 comes into contact with the opposite side of the second electrode 62 of the switch SW to the first electrode 52 side as described above.

  Next, an operation for turning on the switch SW of the load detection sensor 5 will be described.

  When a person sits on the seat, the lower surface of the seat cushion SC moves downward due to the load of the person. In the present embodiment, the lower surface of the seat cushion SC is positioned above the upper ends of the pair of hook portions 22. Therefore, even if the lower surface of the seat cushion SC is inclined with respect to the S spring surface including the respective S springs 90, the upper ends of the pair of hook portions 22 press the lower surfaces of the seat cushion SC, thereby causing the seat cushion SC to The inclination of the lower surface of the plate is moderated to some extent.

  When the lower surface of the seat cushion SC further moves downward, the lower surface of the seat cushion SC comes into contact with the upper surface 47S of the housing cover 4 while being deformed by being pressed by the upper ends of the pair of hook portions 22. At this time, the lower surface of the seat cushion SC may be inclined to some extent while the inclination is relaxed as described above. In this case, the lower surface of the seat cushion SC is also inclined with respect to the mounting surface 21S of the pedestal 2 that is locked by the S spring 90, and the upper surface 47S of the housing cover 4 disposed on the mounting surface 21S. Even so, the lower surface of the seat cushion SC is inclined.

  In the present embodiment, as described above, the housing cover 4 can be rotated so as to tilt around the tip of the switch pressing portion 43 that is a shaft portion in contact with the load detection sensor 5. It moves so that the angle with respect to the surface 21S changes. Therefore, even if the lower surface of the seat cushion SC is inclined with respect to the upper surface 47S of the housing cover 4, the upper surface 47S can be in surface contact with the lower surface of the seat cushion SC so as to follow.

  When the lower surface of the seat cushion SC further moves downward, the gap GA is formed between the housing cover 4 and the housing 3 as described above, so that the housing cover 4 moves downward within the range of the gap GA. Move to.

  FIG. 7 is a diagram illustrating an on state of the load detection sensor 5. As shown in FIG. 7, when the tip of the switch pressing portion 43 presses the second electrode 62 due to the downward movement of the housing cover 4, the second electrode 62 comes into contact with the first electrode 52. As a result, the switch SW of the load detection sensor 5 is turned on. For this reason, the resistance value between the pair of terminals TLX1 (FIG. 5) and TLX2 (FIG. 4) becomes low, and the change in resistance is detected by the engine control unit via a predetermined cable.

  As described above, the load detection sensor unit 1 of this embodiment includes the load detection sensor 5. The load detection sensor 5 includes a first electrode sheet 50 having a first electrode 52 and a second electrode sheet 60 having a second electrode 62 opposed to the first electrode 52. The load detection sensor 5 includes a spacer 70 that is disposed between the first electrode sheet 50 and the second electrode sheet 60 and has an opening 71 between the first electrode 52 and the second electrode 62.

  The load detection sensor 5 is placed on the bottom wall 37 of the housing 3 which is a mounting table, inserted into a fixing pin 33 provided on the bottom wall 37, and a locking claw 33 </ b> X provided on the fixing pin 33. It is sandwiched between the bottom wall 37.

  For this reason, the relative movement in the sheet surface direction between the spacer 70 and the first electrode sheet 50 and the second electrode sheet 60 is restricted by the fixing pin 33. Further, the spacer 70, the first electrode sheet 50, and the second electrode are formed by the fixing pin 33, the bottom wall 37 on the base side of the fixing pin 33, and the locking claw 33 </ b> X on the tip side of the fixing pin 33. The relative movement of the sheet 60 in the direction orthogonal to the sheet surface direction is restricted.

  Here, the spacer 70, the first electrode sheet 50, and the second electrode sheet 60 are not bonded, and there is no adhesive layer. For this reason, even when the load detection sensor unit 1 is placed in an environment where the temperature is high, the adhesive layer does not have a push-up, and the first electrode 52 and the second electrode that are opposed to each other through the opening 71 of the spacer 70. It is avoided that the distance to 62 changes. Therefore, erroneous detection of a load that is not within the load range to be detected due to the change in the interelectrode distance is avoided.

  Further, the relative movement of the spacer 70 and the first electrode sheet 50 and the spacer surface 70 and the second electrode sheet 60 in the sheet surface direction and the direction orthogonal to the direction is restricted. For this reason, even if the spacer 70, the 1st electrode sheet 50, and the 2nd electrode sheet 60 are not adhere | attached, it is avoided that the positional relationship of the 1st electrode 52 and the 2nd electrode 62 changes. Therefore, erroneous detection of a load that is not within the load range to be detected due to the change in the positional relationship between the first electrode 52 and the second electrode 62 is also avoided. Thus, the load detection sensor unit 1 can appropriately detect the load.

  In the load detection sensor unit 1 of the present embodiment, the fixing pin 33 as the first restricting member, and the bottom wall 37, the fixing pin 33, and the locking claw 33X as the second restricting member are integrated. Yes.

  For this reason, the load detection sensor unit 1 eliminates the need for a connecting member that connects the separate first restricting member and the second restricting member, so that it is possible to eliminate erroneous detection caused by aging of the connecting member. it can. In addition to this, the load detection sensor unit 1 can be reduced in size by the amount that the connecting member is unnecessary.

  In the load detection sensor unit 1 of the present embodiment, the fixing pin 33 inserted through the through holes 75C, 75D, 55C, 55D, 65C, 65D of the spacer 70, the first electrode sheet 50, and the second electrode sheet 60, respectively. Is a first regulating member.

  For this reason, in the sheet surface of the 1st electrode sheet 50 and the 2nd electrode sheet 60, the sheet surface direction in the spacer 70 and the 1st electrode sheet 50, and the spacer 70 and the 2nd electrode sheet 60 and its direction are orthogonal. The relative movement of the direction can be restricted. Therefore, the position closer to the first electrode 52 and the second electrode 62 than the case where the first restriction member and the second restriction member are disposed outside the first electrode sheet 50 and the second electrode sheet 60 on the sheet surface direction side. Thus, it is possible to regulate the movement, and for example, it is possible to reduce the fact that the sheet portion near the electrode floats when a load is applied to the load detection sensor unit 1.

  In the load detection sensor unit 1 of the present embodiment, the fixing pin 33 as the first restriction member is a part of the second restriction member and also serves as a part of the second restriction member. For this reason, the number of parts can be suppressed, and the load detection sensor unit 1 can be further downsized accordingly.

  Further, in the load detection sensor unit 1 of the present embodiment, the bottom wall 37 which is a mounting table for the load detection sensor 5, the fixing pin 33 provided on the mounting table, and the second side at the distal end side of the fixing pin 33. A second restricting member is configured by a locking claw 33 </ b> X that is a locking member that locks the electrode sheet 60.

  Therefore, as described above, the load detection sensor 5 can be sandwiched between the bottom wall 37 on the root side of the fixing pin 33 and the locking claw 33X on the distal end side of the fixing pin 33. Therefore, even when vibration is applied to the load detection sensor unit 1, the relative vibration in the direction orthogonal to the sheet surface direction of the spacer 70 and the first electrode sheet 50 and the second electrode sheet 60 due to the vibration. It is possible to prevent the movement restrictions from being lifted or relaxed.

  Further, the spacer 70 and the first electrode sheet 50 can be simply inserted through the through holes 75C, 75D, 55C, 55D, 65C, and 65D of the spacer 70, the first electrode sheet 50, and the second electrode sheet 60. And the relative movement of the sheet surface direction in the 2nd electrode sheet 60 can be controlled. Therefore, for example, it becomes simpler than the case where the tip of the pin is melted and solidified.

  Further, in the load detection sensor unit 1 of the present embodiment, the second electrode sheet 60 is composed of a metal plate 61, the metal plate 61 also serves as the second electrode 62, and the spacer 70 and the metal plate 61 are not bonded. Yes.

  Therefore, since there is little influence by the heat in the 2nd electrode sheet 60, even if it uses in high temperature environment or low temperature environment, the sensitivity of the load detection sensor 5 is stabilized. Moreover, since the 2nd electrode sheet 60 is a metal, damage etc. can be reduced and durability can be improved. Furthermore, the number of parts can be reduced by the amount that the metal plate 61 also serves as the second electrode 62, and the size can be reduced.

  By the way, in the load detection sensor 5 of this embodiment, the circuit site | part formed in the 1st electrode sheet 50 via the 1st contact part 53 of the 1st electrode sheet 50 and the 2nd contact part 63 of the 2nd electrode sheet 60. And the circuit part formed in the second electrode sheet 60 are always in a conductive state. Therefore, each of the pair of terminals TLX1 and TLX2 can be arranged on the first electrode sheet 50.

  Further, in the load detection sensor 5 of the present embodiment, a portion including the second contact portion 63 in the second electrode sheet 60 is a leaf spring that presses the second contact portion 63 against the first contact portion 53. For this reason, the other member for maintaining the 1st contact part 53 and the 2nd contact part 63 in a connection state always can be made unnecessary. Therefore, the increase in the number of parts can be suppressed and the size can be reduced.

  In the load detection sensor 5 of the present embodiment, the second electrode sheet 60 is a metal plate 61. For this reason, since there is little influence by the heat in the 2nd electrode sheet 60, even if it uses in high temperature environment or a low temperature environment, the sensitivity of the load detection sensor 5 is stabilized. Moreover, since the 2nd electrode sheet 60 is a metal, damage etc. can be reduced and durability can be improved. Furthermore, since the second contact portion 63 that is a leaf spring in the second electrode sheet 60 is also a metal, the second contact formed as the leaf spring is compared with a case where a part of the resin sheet is a leaf spring. The malleability and ductility of the part 63 can be increased. Accordingly, it is possible to reduce breakage such as breakage of the second contact portion 63 formed as a leaf spring and improve the durability of the leaf spring.

  Further, in the load detection sensor 5 of the present embodiment, the substrate 51 serving as the sheet of the first electrode sheet 50 penetrates from one surface F1 facing the second electrode sheet 60 to the other surface F2. It has a through hole 55A. Further, the first electrode 52 is electrically connected to a circuit portion disposed on the other surface F2 of the substrate 51 through a first conductive member CPA provided in the first sheet through hole 55A. For this reason, it becomes possible to take out one terminal TLX1 to the other surface F2 of the substrate 51. As in the present embodiment, the terminal TLX1 can be disposed inside the pin through hole 55E different from the first sheet through hole 55A. Therefore, the load detection sensor unit SU is simplified when connected to other electronic components such as the connector 31. Further, since the circuit part can be provided on the other surface F2, it is not necessary to provide the circuit part on the one surface F1, and unevenness due to the circuit part on the one surface F1 can be reduced. Thereby, the sensitivity of the load detection sensor 5 can be stabilized.

  Furthermore, in the load detection sensor 5 of the present embodiment, the opening on the one surface side of the first sheet through hole 55 </ b> A is located in the region where the first electrode 52 is disposed on the one surface F <b> 1 of the substrate 51. The first sheet through hole 55 </ b> A has an air hole SP that communicates with the opening 71 between the first electrode 52 and the second electrode 62 via the electrode through hole 52 </ b> A provided in the first electrode 52. For this reason, the first sheet through-hole 55 </ b> A is a connection hole for electrically connecting the first electrode 52 disposed on the one surface F <b> 1 of the substrate 51 to the circuit portion on the other surface side of the substrate 51. In addition, it also serves as an exhaust hole for discharging the spacer air to the outside. For this reason, durability of the board | substrate 51 can be improved compared with the case where a connection hole and an exhaust hole are provided separately. Further, it is not necessary to provide a separate exhaust hole, and space can be saved.

  Furthermore, in the load detection sensor 5 of the present embodiment, the substrate 51 serving as the sheet of the first electrode sheet 50 is located at a position different from the first sheet through-hole 55A from one surface F1 facing the second electrode sheet 60. It has the 2nd sheet penetration hole 55B which penetrates to the other field F2. Further, the first contact portion 53 is electrically connected to a circuit portion disposed on the other surface F2 of the substrate 51 through a second conductive member CPB provided in the second sheet through hole 55B. For this reason, the pair of terminals TLX1 and TLX2 can be taken out from the other surface F2 of the substrate 51. As in the present embodiment, the terminals TLX1 and TLX2 can be arranged inside the pin through holes 55E and 55F different from the first sheet through hole 55A. Therefore, the load detection sensor unit SU is simplified when connected to other electronic components such as the connector 31. Further, since the circuit part can be provided on the other surface F2, it is not necessary to provide the circuit part on the one surface F1, and unevenness due to the circuit part on the one surface F1 can be reduced. Thereby, the sensitivity of the load detection sensor 5 can be stabilized.

  Furthermore, in the load detection sensor 5 of the present embodiment, the substrate 51 having the first electrode 52, the second electrode sheet 60 having the second electrode 62 disposed on the one surface F1 of the substrate 51 via the spacer 70, and including. A parallel resistor R1 and a series resistor r1 made up of chip resistors are arranged on the other surface F2 opposite to the one surface F1 of the substrate 51 facing the spacer 70.

  Although the thickness of the chip resistor is generally larger than the thickness of the printing resistor, in this embodiment, the side of the substrate 51 opposite to the side where the first electrode 52 facing the second electrode 62 is disposed. Since it arrange | positions on the other surface F2, it can avoid that the sensitivity of the load detection sensor 5 deteriorates with the thickness of chip resistance. In addition, since the chip resistor can generally set the resistance value more accurately than the printed resistor, in this embodiment, the presence or absence of seating can be detected more clearly.

  Furthermore, in the load detection sensor 5 of the present embodiment, the circuit portion, the parallel resistance R1 and the series resistance r1 in the first electrode sheet 50 are provided on the other surface F2 of the substrate 51, and the pair of terminals TLX1 and TLX2 are pin through holes. 55E and 55F are provided. For this reason, components other than the 1st electrode 52 and the 1st contact part 53 can be excluded from one surface F1 of the board | substrate 51. FIG. Therefore, the unevenness | corrugation by other components can be eliminated in one surface F1 of the board | substrate 51, and the sensitivity of the load detection sensor 5 can be improved more.

(2) Modifications The load detection sensor unit of the present invention has been described above by taking the above embodiment as an example, but the present invention is not limited to the above embodiment.

  For example, in the above embodiment, the fixing pin 33 is employed as the first restricting member. However, the first restricting member is not limited to the fixing pin 33. For example, a frame member that surrounds the side surface of the load detection sensor 5 in which the first electrode sheet 50, the spacer 70, and the second electrode sheet 60 are superimposed in this order is employed as the first restriction member, and the frame member is the bottom of the housing 3. It may be provided on the wall 37. In short, the first regulating member may be any member that regulates the relative movement of the spacer 70, the first electrode sheet 50, and the second electrode sheet 60 in the sheet surface direction.

Moreover, in the said embodiment, the 2nd control member was comprised by the bottom wall 37 and the latching claw 33X which are integrally provided in the fixing pin 33 as a 1st control member, and the said pin 33 for fixing. However, the second restricting member can have various configurations. For example, a second cover member is configured by the bottom wall 37 and a pressing member that presses the load detection sensor 5 placed on the bottom wall 37, and the pressing member is a separate body from the fixing pin 33. 4 may be provided on the side opposite to the upper surface 47S.
Moreover, although the latching claw 33X is employ | adopted as a latching member which is one of the components of a 2nd control member, it can replace with another latching member. For example, as shown in FIG. 8, when the distal end portion of the fixing pin 33 is melted and solidified, a fusion portion 103 that fuses the fixation pin 33 and the metal plate 61 is employed as a locking member. May be. Note that the fixing pin 33 and the fusion bonding portion 103 are not hatched so as to be easily distinguished from the substrate 51 of the first electrode sheet 50, the spacer 70, and the metal plate 61 of the second electrode sheet 60.
In short, the second restricting member may be any member that restricts relative movement of the spacer 70, the first electrode sheet 50, and the second electrode sheet 60 in the direction orthogonal to the sheet surface direction. May be separate.

In the above embodiment, the substrate 51 having the first electrode 52, the metal plate 61 serving as the second electrode 62 facing away from the first electrode 52, and the spacer disposed between the substrate 51 and the metal plate 61. The load detection sensor 5 having a structure including 70 is employed. However, the structure of the load detection sensor 5 is not limited to the above embodiment.
For example, although the substrate 51 having the first electrode 52 is employed as the first electrode sheet 50, an insulating sheet having the first electrode 52 may be employed instead of the substrate 51. When this insulating sheet is employed, the insulating sheet and the spacer 70 are not bonded as in the above embodiment.
For example, as shown in FIG. 9, a load detection sensor having a so-called membrane switch structure constituted by a pair of insulating sheets 81 and 83 and a sheet-like spacer 82 sandwiched between the insulating sheets 81 and 83 is employed. Also good. Examples of the material for the insulating sheets 81 and 83 and the spacer 82 include resins such as PET, PBT, and PEN.
The insulating sheet 81 includes a sheet main body 81A and a terminal arrangement portion 81B protruding from the sheet main body 81A. In the sheet main body 81A, the first electrode 52 is provided on one surface facing the spacer 82, and a pair of through holes 81H through which the fixing pins 33 are inserted are provided. The terminal arrangement portion 81B is provided so as not to overlap with the terminal arrangement portion 83B of the insulating sheet 83 in the direction orthogonal to the sheet surface. The terminal arrangement portion 81B is provided with the first electrode 52 in the sheet main body 81A. A plate-like terminal 81T is arranged on the same surface as the surface being provided. The terminal 81T is connected to the first electrode 52 via a wiring and is electrically connected to the connector terminal of the connector 31 via a lead wire or the like.
The insulating sheet 83 includes a sheet main body 83A and a terminal arrangement portion 83B protruding from the sheet main body 83A. In the sheet main body 83A, the second electrode 62 is provided on one side facing the spacer 82, and a pair of through holes 83H through which the fixing pins 33 are inserted are provided. In the terminal arrangement portion 83B, a plate-like terminal 83T is arranged on the same surface as the surface on which the second electrode 62 is provided in the sheet main body 83A. The terminal 83T is connected to the second electrode 62 via a wiring and is electrically connected to the connector terminal of the connector 31 via a lead wire or the like.
The spacer 82 has the same shape and size as the sheet main body 81A. The spacer 82 has an opening 82O between the first electrode 52 and the second electrode 62 facing each other, and the fixing pin 33 has the fixing pin 33. A pair of through holes 82H to be inserted is provided. A slit SR serving as an air vent is formed in the opening 82O.
When the load detection sensor having such a membrane switch structure is employed, if the pair of insulating sheets 81 and 83 and the sheet-like spacer 82 sandwiched between the insulating sheets 81 and 83 are not bonded, the above-described embodiment is achieved. The same effect is produced.
In the load detection sensor shown in FIG. 9, a metal plate 84 having a pair of through holes 84 </ b> H through which the fixing pins 33 are inserted is provided, and the second electrode sheet is composed of two layers, the metal plate 84 and the insulating sheet 83. Is configured. Thus, when the second electrode sheet has a two-layer structure, the load detection sensor is used even in a high temperature environment or a low temperature environment because the second electrode sheet has the metal plate 84 that is less affected by heat. The sensitivity of is stable. Moreover, since the 2nd electrode sheet has the metal plate 84, damage etc. can be reduced and durability can be improved.
The metal plate 84 and the insulating sheet 83 may be bonded or non-bonded. When the metal plate 84 and the insulating sheet 83 are bonded, even if creep occurs in the adhesive layer between the metal plate 84 and the insulating sheet 83, the pressure on the metal plate 84 is released and the metal is moved to the position when not pressed. When the plate 84 returns, the metal plate 84 can return the insulating sheet 83 to the position. In general, since a metal is less likely to creep than a resin, it is difficult for the metal plate 84 to be pressed. Therefore, it becomes easy to suppress the erroneous detection of the load caused by the pushing rod.
On the other hand, when the metal plate 84 and the insulating sheet 83 are not bonded, since there is no adhesive layer between the metal plate 84 and the insulating sheet 83, the creep of the adhesive layer is not considered. In addition, when the pressure on the metal plate 84 is released and the metal plate 84 returns to the non-pressed position, the amount of the metal plate 84 returning the insulating sheet 83 to the position is not considered. Therefore, it becomes easy to adjust the amount of load until the first electrode 52 and the second electrode 62 come into contact with each other.
However, the metal plate 84 may be omitted.

  The components in the load detection sensor unit 1 described above are appropriately combined, omitted, modified, or added with a well-known technique within the scope not departing from the purpose of the present application, in addition to the contents shown in the above-described embodiments and modifications. Can do.

The present invention can be used as long as the presence / absence of a load on a detection target to be detected is detected. That is, in the above embodiment, the load detection sensor unit 1 is disposed below the seat cushion SC of the vehicle, and the presence or absence of a person's seating is detected by the load detection sensor unit 1, but the present invention is not limited to the above embodiment. It can be adopted.
For example, the form which arrange | positions the load detection sensor unit 1 under the seat cushion of the bed for care is mentioned. Even if it is such a form, it can show whether a person exists in a seat cushion using load detection sensor unit 1. The present invention can also be used to detect a load when a load detection sensor unit 1 is arranged as a part of a switch of an electronic device or the like and a human finger presses the switch.

DESCRIPTION OF SYMBOLS 1 ... Load detection sensor unit 3 ... Housing 4 ... Housing cover 5 ... Load detection sensor 21 ... Mounting part 22 ... Hook part 31 ... Connector 32 ... Switch accommodation Part 33: Pin 33X for fixing ... Locking claw 50 ... First electrode sheet 60 ... Second electrode sheet 70 ... Spacer 90 ... S spring AP ... Connection maintaining part SC ... Seat cushion SW ... Switch r1 ... Series resistance R1 ... Parallel resistance

Claims (7)

A first electrode sheet having a first electrode; a second electrode sheet having a second electrode facing the first electrode; and the first electrode sheet and the second electrode sheet. A load detection sensor having an electrode and a spacer having an opening between the second electrode;
A first regulating member that regulates relative movement in the sheet surface direction of the spacer, the first electrode sheet, and the second electrode sheet;
A second restricting member that restricts relative movement in a direction orthogonal to the sheet surface direction of the spacer, the first electrode sheet, and the second electrode sheet;
The load detection sensor unit, wherein the spacer, the first electrode sheet, and the second electrode sheet are not bonded. The load detection sensor unit according to claim 1, wherein the first restriction member and the second restriction member are integrated. The spacer, the first electrode sheet, and the second electrode sheet each have a through hole,
The load detection sensor unit according to claim 1, wherein the first restricting member is a pin inserted into the through hole. The load detection sensor unit according to claim 3, wherein the pin is a part of the second restricting member. The second restricting member includes a mounting table on which the load detection sensor is mounted, the pin provided on the mounting table, and a locking member that locks the second electrode sheet on the tip side of the pin. The load detection sensor unit according to claim 4, wherein: The second electrode sheet is made of a metal plate, and the metal plate also serves as the second electrode,
The load detection sensor unit according to claim 1, wherein the spacer and the metal plate are not bonded. The second electrode sheet has an insulating sheet having the second electrode, and a metal plate disposed on a surface of the insulating sheet opposite to a spacer side surface,
The load detection sensor unit according to any one of claims 1 to 5, wherein the insulating sheet and the spacer are not bonded.

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