JP2017174767A - Load detection sensor unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To arrange a pair of terminals in any one of sheets facing each other.SOLUTION: A load detection sensor unit 1 includes: a spacer 50 having an opening 51; and an insulation sheet 10 having flexibility and being bent to sandwich the spacer 50. The insulation sheet 10 has: a first insulation sheet part 10A placed on one side of the insulation sheet 10 and provided with a first electrode 11 at a position overlapping the opening 51; a second insulation sheet part 10B placed on the other side of the spacer 50 and provided with a second electrode 21 facing the first electrode 11 through the opening 51; and a bent part 10C coupled with first insulation sheet part 10A and second insulation sheet part 10B and being bent. A protective layer 40 is provided on the inside surface of the bent part 10C.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a load detection sensor unit, which is suitable for detecting the seating of a person.

  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 the seat belt is not detected while a person is seated. As a load detection sensor for detecting a load caused by a person sitting, for example, there is one described in Patent Document 1 below.

  The load detection sensor of Patent Document 1 includes a plurality of first electrodes fixed to a film surface of a first film, and a plurality of second electrodes fixed to a film surface facing the first film surface in the second film. It has. Moreover, the load detection sensor of patent document 1 is provided with the spacer arrange | positioned between the 1st film and the 2nd film in the state which each 1st electrode and 2nd electrode oppose at predetermined intervals. .

Japanese Patent Laid-Open No. 9-315199

  However, in the load detection sensor of the above-mentioned Patent Document 1, there are a plurality of switches configured by one electrode and the other electrode, and these switches may be connected in series. In such a case, if the number of switches is an odd number, it is required that one of the pair of terminals in the load detection sensor of Patent Document 1 is disposed on the first film and the other is disposed on the second film.

  Therefore, an object of the present invention is to provide a load detection sensor unit in which a pair of terminals can be arranged on any of sheets facing each other.

  In order to solve the above problems, a load detection sensor unit of the present invention includes a spacer having an opening, and an insulating sheet having flexibility and being bent so as to sandwich the spacer, and the insulating sheet includes the spacer. A first insulating sheet portion provided with a first electrode at a position overlapping with the opening and disposed on one surface side of the spacer, and disposed on the other surface side of the spacer and opposed to the first electrode through the opening. A second insulating sheet portion provided with a second electrode; and a bent portion connected to and bent by the first insulating sheet portion and the second insulating sheet portion. The first insulating sheet portion includes a pair of terminals. The first electrode is electrically connected to one of the pair of terminals via a first wiring provided in the first insulating sheet portion, and the second electrode is connected to the first electrode. 1 Insulation sheet The second wiring is electrically connected to the other of the pair of terminals via the bending portion and a second wiring provided to extend to the second insulating sheet portion. A protective layer is provided on the top.

In such a load detection sensor unit, since the first insulating sheet portion and the second insulating sheet portion are connected via the bent portion, the circuit on the first insulating sheet portion side and the circuit on the second insulating sheet portion side And can be connected through a bent portion. Therefore, a circuit can be formed in a state in which a pair of terminals are arranged on, for example, the first insulating sheet portion of the first insulating sheet portion and the second insulating sheet portion facing each other.
By the way, when the insulating sheet is bent at the bent portion so as to sandwich the spacer, if the bent portion is only the insulating sheet, the second wiring provided in the bent portion tends to be bent at an acute angle and disconnected.
On the other hand, in the present invention, since the protective layer is provided on the second wiring inside the bending portion, the bending portion is bent so that the second wiring draws an arc without forming a corner. Can be suppressed. Further, the protective layer can prevent dust and the like from entering the second wiring provided inside the bent portion, and can also prevent a failure such as a short circuit due to adhesion of the dust and the like.

  The protective layer may be provided on at least a region other than a region adjacent to the first insulating sheet portion and the second insulating sheet portion on the inner surface of the bent portion, and on the second wiring. preferable.

  Compared to the case where the protective layer is provided only on the second wiring provided in the bent portion, the second wiring can be further protected by the protective layer.

  It is preferable that a gap is formed between the protective layer and the spacer other than the portion where the second wiring is provided.

  Since there is a gap between the spacer sandwiched between the first insulating sheet part and the second insulating sheet part and the bent part connected to the first insulating sheet part and the second insulating sheet part, it is in a substantially parallel state. A state in which a connecting portion between a certain insulating sheet portion and a bent portion in a bent state is raised and thickened is reduced, and the state transition is easily smoothed.

  Moreover, it is preferable that the thickness of the protective layer is thinner than the thickness of the spacer.

  In this case, it is possible to further reduce the thickness of the bent portion while preventing the bending portion from being difficult to bend.

  It is preferable to further include a winding core portion around which the bent portion is wound.

  Since the bent portion of the insulating sheet is wound around the winding core portion, the second wiring disposed in the bending portion is prevented from having a radius of curvature equal to or less than the diameter of the winding core portion. Therefore, the second wiring arranged in the bent portion is further suppressed from being bent so as to be crushed at an acute angle.

  It is preferable to further include a pedestal having a placement portion on which the first insulating sheet portion is placed and the winding core portion that is spaced apart from the placement portion.

  In this case, since the bent portion of the insulating sheet is supported by the winding core portion of the pedestal, the first insulating sheet portion and the second insulating sheet portion of the insulating sheet are stably arranged on the mounting portion of the pedestal. be able to. Therefore, it can suppress that the position of the 1st electrode provided in the 1st insulating sheet part and the 2nd electrode provided in the 2nd insulating sheet part shifts, and it comprises the 1st electrode and the 2nd electrode concerned. Can be properly turned on.

  It is preferable that a resistor provided on the surface of the first insulating sheet portion is further provided, and the resistor is electrically connected to the first wiring and the second wiring or the pair of terminals.

  When it does in this way, a disconnection can be detected with the resistance provided on the surface of a 1st insulating sheet part.

  As described above, according to the present invention, there is provided a load detection sensor unit capable of arranging a pair of terminals on any of sheets facing each other.

It is the figure which looked at the load detection sensor unit from the upper side. It is sectional drawing of the load detection sensor unit which passes along the XX line of FIG. It is the figure which looked at the insulating sheet in the state before bending from the one surface side. It is the figure which looked at the spacer from the one surface side. It is a figure which shows a mode that the load detection sensor unit is attached to the seat apparatus. It is a figure which shows a mode that the switch of a load detection sensor turns on. It is a figure which shows a mode that the other protective layer was applied from the same viewpoint as FIG. It is a figure which shows the load detection sensor unit which replaced the protective layer of the load detection sensor unit shown in FIG. 1 with the protective layer shown in FIG. 7 in the cross section which passes through YY of FIG.

  Hereinafter, a preferred embodiment of a load detection sensor unit 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 a view of the load detection sensor unit 1 as viewed from above, and FIG. 2 is a cross-sectional view of the load detection sensor unit passing through the line XX of FIG. As shown in FIGS. 1 and 2, the load detection sensor unit 1 in this embodiment includes a pedestal 2 and a load detection sensor 3 as main components.

  The pedestal 2 is a member that supports the load detection sensor 3 and is made of metal in this embodiment. Examples of the metal include copper and stainless steel. The pedestal 2 includes a placing portion 2A, a winding core portion 2B, a connecting portion 2C, and a pair of hook portions 2D.

  The mounting portion 2A is a part on which a part of the load detection sensor 3 is mounted, and in the present embodiment, has a rectangular plate shape.

  The winding core portion 2B is a portion around which another part of the load detection sensor 3 different from the portion placed on the placement portion 2A is wound, and in the present embodiment, the winding core portion 2B is formed in a rod shape having a circular cross section. The winding core portion 2B is separated from the placement portion 2A and extends along one end on the short side of the placement portion 2A, for example. One end of the winding core portion 2B is an open end, and the other end of the winding core portion 2B is connected to the connecting portion 2C.

  The connecting portion 2C is a portion that connects the placement portion 2A and the winding core portion 2B, and in the present embodiment, has a rectangular plate shape smaller than the placement portion 2A. One side surface in the longitudinal direction of the connecting portion 2C is on the same surface as the side surface in the longitudinal direction of the mounting portion 2A, and the other side surface in the longitudinal direction is opposite to the open end of the winding core portion 2B. Are connected at the other end. In addition, one side surface portion of the mounting portion 2A in the short direction is connected to one side surface of the connecting portion 2C in the short direction.

  The pair of hook portions 2D are locking portions for locking the base 2 to a pair of adjacent S springs among a plurality of S springs arranged side by side in the opening of the frame in the vehicle seat device, and are fitted into the S springs. It is possible. In the present embodiment, the pair of hook portions 2D are connected to the central portion of the side surface in the longitudinal direction of the placement portion 2A, respectively.

  The load detection sensor 3 includes an insulating sheet 10 and a spacer 50 as main components.

  The insulating sheet 10 is a resin sheet having flexibility, and is bent so as to sandwich the spacer 50. Examples of the material for the insulating sheet 10 include polyethylene terephthalate (PET), polyimide (PI), and polyethylene naphthalate (PEN).

  FIG. 3 is a front view of the insulating sheet in a state before being bent from one surface side. As shown in FIG. 3, the insulating sheet 10 is composed of a single sheet, and is connected to the first insulating sheet portion 10A, the second insulating sheet portion 10B, the first insulating sheet portion 10A, and the second insulating sheet portion 10B. And a bent portion 10C that is bent.

  The first insulating sheet portion 10A includes a main block B11 and a tail block B12 extending from a peripheral portion of the main block B11. The main block B11 is circular in this embodiment, and the tail block B12 is rectangular with a width smaller than the radius of the main block B11. The first electrode 11 is provided on the main block B11 on one surface FA of the first insulating sheet portion 10A, and the pair of terminals 12A and 12B are provided on the tail block B12 on the surface FA.

  The first electrode 11 is one electrode constituting the switch SW, and is formed of a conductor layer. In the present embodiment, the first electrode 11 is a substantially circular metal printing layer that is smaller than the outer shape of the main block B11, and is provided at the approximate center of the main block B11.

  The pair of terminals 12A and 12B are made of a conductor layer. These terminals 12A and 12B are substantially rectangular metal layers in the present embodiment, and are the ends of the tail block B12 opposite to the side connected to the main block B11, and one of the first insulating sheet portions 10A. Provided on surface FA. One terminal 12A of the pair of terminals 12A and 12B and the first electrode 11 are electrically connected to each other. That is, the 1st electrode 11 is electrically connected with one terminal 12A of a pair of terminals 12A and 12B via the 1st wiring 31 provided in 10A of 1st insulating sheets.

  The second insulating sheet portion 10B includes a main block B13 and a tail block B14 extending from the peripheral portion of the main block B13 in the direction opposite to the extending direction of the tail block B12. In this embodiment, the main block B13 has the same shape and size as the main block B11. In this embodiment, the tail block B14 has the same width as the tail block B12, and is shorter than the length of the tail block B12. The second electrode 21 is provided on the main block B13 on the one surface FB of the second insulating sheet portion 10B. In addition, one surface FB of the second insulating sheet portion 10B is on the same side as the one surface FA of the first insulating sheet portion 10A.

  The second electrode 21 is the other electrode constituting the switch SW and is made of a conductor layer. In the present embodiment, the second electrode 21 has the same shape and size as the first electrode 11 and is provided at the approximate center of the main block B13. The second electrode 21 is connected to the other of the pair of terminals 12A and 12B via a second wiring 32 provided to extend to the first insulating sheet portion 10A, the bent portion 10C, and the second insulating sheet portion 10B. It is electrically connected to the terminal 12B.

  The second wiring 32 crosses the main block B13 of the second insulating sheet portion 10B and the main block B11 of the first insulating sheet portion 10A via the bent portion 10C. Further, the second wiring 32 extends between the first electrode 11 and the end of the main block B11 in the main block B11 of the first insulating sheet portion 10A, and in the tail block B12 of the first insulating sheet portion 10A. The first wiring 31 extends in parallel. A resistor R is connected between the first wiring 31 and the second wiring 32 portion arranged in parallel to the first wiring 31. The resistor R is a parallel resistor that is in parallel with the switch SW constituted by the first electrode 11 and the second electrode 21, and is a printing resistor in this embodiment.

  The bent portion 10C is a portion that is connected to the first insulating sheet portion 10A and the second insulating sheet portion 10B and bent. In this embodiment, the bent portion 10C extends along the extending direction in which the tail block B12 of the first insulating sheet portion 10A and the tail block B14 of the second insulating sheet portion 10B extend. The width is the same as the width of B12 and B14, and is longer than the length of the tail blocks B12 and B14. A protective layer 40 is provided on one surface FC of the bent portion 10 </ b> C, and a portion of the second wiring 32 extending on the surface FC is covered with the protective layer 40.

  One surface FC of the bent portion 10C is on the same side as one surface FA of the first insulating sheet portion 10A and one surface FB of the second insulating sheet portion 10B. These surfaces FA to FC are insulating sheets. 10 is a part of one surface F. Further, as shown in FIG. 2, when the bent portion 10C is bent so as to be wound around the winding core portion 2B, one surface FC of the bent portion 10C becomes an inner surface of the bent portion 10C in the bent state. .

  The protective layer 40 is an insulating layer, and is thinner than the spacer 50 in this embodiment, as shown in FIG. The protective layer 40 may be a resist or a tape, and may have a two-layer structure of the resist layer and the tape layer.

  As shown in FIG. 2, the spacer 50 is a thin insulating member that is sandwiched between the first insulating sheet portion 10A and the second insulating sheet portion 10B. FIG. 4 is a front view of the spacer from one surface side. As shown in FIG. 4, the spacer 50 has approximately the same shape and size as the second insulating sheet portion 10 </ b> B in the present embodiment. Examples of the material of the spacer 50 include resins such as PET, PI, and PEN.

  An opening 51 is formed in the spacer 50. The opening 51 has a substantially circular shape and has a diameter slightly smaller than the diameters of the first electrode 11 and the second electrode 21. That is, as shown in FIGS. 1 and 2, the opening 51 is formed so as to be located inside the peripheral edges of the first electrode 11 and the second electrode 21 that are opposed to each other through the opening 51.

  Further, the spacer 50 is formed with a slit 52 that connects the space in the opening 51 and the space outside the load detection sensor 3. As shown in FIG. 1, the slit 52 has the first insulating sheet portion 10 </ b> A attached to one surface side of the spacer 50 and the second insulating sheet portion 10 </ b> B attached to the other surface side of the spacer 50. In this state, it is an air vent.

  In such a load detection sensor unit 1, as shown in FIGS. 1 and 2, the insulating sheet 10 is arranged so that the surface FA of the first insulating sheet portion 10 </ b> A and the surface FB of the second insulating sheet portion 10 </ b> B face each other. Folded at the bent portion 10C. At this time, the bending portion 10 </ b> C is bent so as to be wound around the winding core portion 2 </ b> B of the base 2.

  Further, between the first insulating sheet portion 10A and the second insulating sheet portion 10B facing each other, the first electrode 11 and the second electrode 21 are opposed to each other through the opening 51 of the spacer 50. 50 is arranged. The spacer 50 and the first insulating sheet portion 10A are attached with an adhesive or the like, and the spacer 50 and the second insulating sheet portion 10B are attached with an adhesive or the like. In FIG. 2, the adhesive layers between the spacer 50 and the first insulating sheet portion 10A and between the spacer 50 and the second insulating sheet portion 10B are omitted for easy understanding.

  With the first insulating sheet portion 10 </ b> A and the second insulating sheet portion 10 </ b> B attached to the spacer 50, the first insulating sheet portion 10 </ b> A is disposed on the mounting portion 2 </ b> A of the base 2. Note that the first insulating sheet portion 10A and the placement portion 2A may or may not be attached by an adhesive or the like.

  As described above, the first insulating sheet portion 10A is larger than the second insulating sheet portion 10B and the spacer 50. For this reason, in the state where the first insulating sheet portion 10A and the second insulating sheet portion 10B are adhered to the spacer 50, a part of one surface FA of the first insulating sheet portion 10A is the second insulating sheet portion. 10B and the exposed surface EF exposed without being covered with the spacer 50. A pair of terminals 12A and 12B are disposed on the exposed surface EF, and signal cables 15A and 15B are connected to the terminals 12A and 12B, respectively.

  The end portions of the first insulating sheet portion 10A and the second insulating sheet portion 10B including the terminals 12A and 12B and the distal end portions of the signal cables 15A and 15B connected to the terminals 12A and 12B are covered with the sealing resin 16. Is done. The sealing resin 16 suppresses the signal cables 15A and 15B from being disconnected from the terminals 12A and 12B, and prevents the terminals 12A and 12B from being short-circuited by conductive dust or the like. The sealing resin 16 is made of, for example, hot melt or photo-curing resin.

  Next, a mounting example of the load detection sensor unit 1 will be described.

  FIG. 5 is a diagram illustrating a state in which the load detection sensor unit 1 is attached to the seat device. In the example shown in FIG. 5, the pair of hook portions 2 </ b> D of the pedestal 2 are aligned in the lateral direction of the seat device, and are fitted into a pair of S springs 60 adjacent in the lateral direction. In a state in which the hook portion 2D is fitted into the S spring 60, the upper end portion of the hook portion 2D is located below the lower surface of the seat cushion SC placed on the plurality of S springs 60, and is below the lower surface. The mounting portion 2A of the base 2 is located on the side. In this state, the mounting portion 2 </ b> A of the base 2 is disposed between a pair of adjacent S springs 60.

  Next, an operation of turning on the switch SW of the load detection sensor 3 in the load detection sensor unit 1 attached to the seat device will be described.

  FIG. 6 is a diagram illustrating a state in which the switch SW of the load detection sensor 3 is turned on. As shown in FIG. 6, when a person sits on the seat device, the lower surface of the seat cushion SC moves downward due to the load of the person. As described above, the upper ends of the pair of hook portions 2D of the base 2 are located below the lower surface of the seat cushion SC. For this reason, even if the lower surface of the seat cushion SC is inclined with respect to the S spring surfaces including the respective S springs 60, the upper ends of the pair of hook portions 2D press the lower surfaces of the seat cushion SC, thereby The inclination of the lower surface of the SC is moderated to some extent.

  When the lower surface of the seat cushion SC moves further downward, the seat cushion SC comes into contact with the second insulating sheet portion 10B of the load detection sensor 3 placed on the placing portion 2A of the base 2 and the second insulating sheet. The load detection sensor 3 is pressed from the part 10B side. Thereby, in the load detection sensor 3, the second insulating sheet portion 10B is deformed so as to bend toward the first insulating sheet portion 10A, and the second electrode 21 provided on the second insulating sheet portion 10B is provided on the first insulating sheet portion 10A. In contact with the first electrode 11 side. Thus, the switch SW of the load detection sensor 3 is turned on. When the switch SW of the load detection sensor 3 is turned on, the resistance value between the pair of terminals 12A and 12B (FIG. 1) is lowered, and the change in resistance is illustrated via the signal cables 15A and 15B (FIG. 1). Detected by an engine control unit (not shown). As a result, the engine control unit recognizes that a load has been applied to the seat device.

  As described above, in the load detection sensor unit 1 of the present embodiment, the insulating sheet 10 that is bent so as to sandwich the spacer 50 is provided. This insulating sheet 10 has a first insulating sheet portion 10 </ b> A in which the first electrode 11 is provided at a position that is disposed on one surface side of the spacer 50 and overlaps the opening 51. Further, the insulating sheet 10 has a second insulating sheet portion 10 </ b> B provided with a second electrode 21 disposed on the other surface side of the spacer 50 and facing the first electrode 11 through the opening 51. Furthermore, the insulating sheet 10 has a bent portion 10C that is connected to the first insulating sheet portion 10A and the second insulating sheet portion 10B and bent.

  The first insulating sheet portion 10A is provided with a pair of terminals 12A and 12B, and the first electrode 11 is connected to the pair of terminals 12A and 12B via the first wiring 31 provided on the first insulating sheet portion 10A. It is electrically connected to one side. The second electrode 21 is connected to the other of the pair of terminals 12A and 12B via a second wiring 32 provided extending to the first insulating sheet portion 10A, the bent portion 10C, and the second insulating sheet portion 10B. Electrically connected.

  In such a load detection sensor unit 1, since the first insulating sheet portion 10A and the second insulating sheet portion 10B are connected via the bent portion 10C, the circuit on the first insulating sheet portion 10A side and the second insulating sheet portion are connected. The circuit on the sheet portion 10B side can be connected through the bent portion 10C.

  Therefore, in the load detection sensor unit 1, a circuit is formed in a state where the pair of terminals 12A and 12B are arranged on the first insulating sheet portion 10A among the first insulating sheet portion 10A and the second insulating sheet portion 10B facing each other. Can do.

  By the way, when the insulating sheet 10 is bent at the bent portion 10C so as to sandwich the spacer 50, if the bent portion 10C is only the insulating sheet 10, the second wiring 32 provided on the bent portion 10C is bent so as to be crushed at an acute angle. , Tend to break.

  On the other hand, in the load detection sensor unit 1 of this embodiment, the protective layer 40 is provided on the inner surface of the bent portion 10C. That is, since the protective layer 40 is provided on the second wiring 32 inside the bending portion 10C, the bending portion 10C is bent so that the second wiring 32 forms an arc without forming a corner, and the second wiring 32 disconnection can be suppressed. In addition, the protective layer 40 can prevent dust and the like from entering the second wiring 32, and can also prevent a failure such as a short circuit due to adhesion of the dust and the like.

  In the load detection sensor unit 1 of the present embodiment, the protective layer 40 is thinner than the spacer 50. For this reason, it is possible to further reduce the thickness of the bent portion 10C while suppressing the bending portion 10C from being difficult to bend.

  Moreover, in the load detection sensor unit 1 of this embodiment, the winding core part 2B around which the bending part 10C is wound is provided. Since the bending portion 10C of the insulating sheet 10 is wound around the winding core portion 2B, the second wiring 32 disposed in the bending portion 10C is suppressed from having a curvature radius equal to or less than the diameter of the winding core portion 2B. . Therefore, the second wiring 32 disposed in the bent portion 10C is further suppressed from being bent so as to be crushed at an acute angle.

  Further, in the load detection sensor unit 1 of the present embodiment, a placement portion 2A on which the first insulating sheet portion 10A is placed, and a winding core portion 2B on which the bending portion 10C is wound apart from the placement portion 2A. A pedestal 2 is provided.

  In such a load detection sensor unit 1, since the bending part 10C of the insulating sheet 10 is supported by the winding core part 2B of the base 2, the first insulating sheet part 10A and the second insulating sheet part 10B of the insulating sheet 10 are connected. It can be stably arranged on the mounting portion 2A of the base 2. Therefore, it can suppress that the position of the 1st electrode 11 provided in 10 A of 1st insulation sheets and the 2nd electrode 21 provided in the 2nd insulation sheet part 10B shifts, the 1st electrode 11 and the 1st The switch SW composed of the two electrodes 21 can be appropriately turned on.

  The load detection sensor unit 1 has been described above by taking the above embodiment as an example. However, the present invention is not limited to the load detection sensor unit 1 of the above embodiment.

  For example, in the above embodiment, the pedestal 2 is made of metal, but may be made of resin such as PET, PI, PEN, polycarbonate, phenol resin, and epoxy resin. When the pedestal 2 is made of resin, the placement portion 2A, the winding core portion 2B, the connecting portion 2C, and the pair of hook portions 2D of the pedestal 2 can be integrally manufactured by molding. When the pedestal 2 is made of metal as in the above-described embodiment, the mounting portion 2A, the winding core portion 2B, the connecting portion 2C, and the pair of hook portions 2D constituting the pedestal 2 are each made of individual metal members. It is possible to connect by welding. Further, a notch is provided in a part of one metal plate to produce a mounting portion 2A, a winding core portion 2B, a connecting portion 2C, and a pair of hook portions 2D, and the hook portion 2D is processed into a circle. May be.

  Moreover, in the said embodiment, the core part 2B and the connection part 2C in the base 2 were provided as a part of component of the base 2. As shown in FIG. However, one or both of the winding core part 2 </ b> B and the connecting part 2 </ b> C may be provided as a member different from the base 2. The pedestal 2 may be omitted.

  Moreover, in the said embodiment, the cross-sectional shape of the winding core part 2B of the base 2 was made circular. However, the cross-sectional shape of the winding core portion 2B can be various shapes such as a rectangle or an ellipse. Furthermore, although the winding core part 2B was made into the rod shape, if it can be bent so that the bending part 10C of the load detection sensor 3 may be wound, it may not be a rod shape.

  Moreover, in the said embodiment, the mounting surface in 2 A of mounting parts of the base 2 and the upper surface in the winding core part 2B of the said base 2 were made substantially the same. However, the winding core portion 2B of the pedestal 2 may be disposed above or below the placement portion 2A of the pedestal 2.

  Moreover, in the said embodiment, it is wound around the core part 2B in the state where the contact part of the bending part 10C and the core part 2B is smaller than the non-contact part of the said bending part 10C and the core part 2B. The bent portion 10C was bent. However, the bent portion 10C is bent so that the bent portion 10C is wound around the core portion 2B in a state where the contact portion between the bent portion 10C and the core portion 2B is larger than the non-contact portion between the bent portion 10C and the core portion 2B. It may be done. In addition, even if the contact part of 10 C of bending parts and the core part 2B is stuck by the adhesive agent etc., it does not need to be stuck.

  In the above embodiment, the first insulating sheet portion 10 </ b> A is directly placed on the placement portion 2 </ b> A of the base 2. However, another member is disposed between the placing portion 2A and the first insulating sheet portion 10A, and the first insulating sheet portion 10A is indirectly placed on the placing portion 2A of the base 2 via the member. May be. In addition, as another member, the foam pad as a cushion material provided in the part which overlaps at least in the perpendicular direction of switch SW among the mounting part 2A and 10 A of 1st insulations is mentioned, for example. As another example, the mounting portion 2A and the first insulating sheet portion so that the mounting surface of the mounting portion 2A and the sheet surface of the first insulating sheet portion 10A facing the mounting surface are substantially parallel to each other. The adjustment member provided between 10A is mentioned. By the way, the pedestal 2 is provided with a recess on the placement surface side so that the placement surface of the placement portion 2A and the sheet surface of the first insulating sheet portion 10A facing the placement surface are substantially parallel. May be.

  In the above embodiment, the protective layer 40 is thinner than the spacer 50. However, the thickness of the protective layer 40 may be greater than or equal to the thickness of the spacer 50. However, it is preferable that the thickness of the protective layer 40 is smaller than the thickness of the spacer 50 in order to prevent the bending portion 10 </ b> C from being difficult to bend and to further reduce the thickness of the bending portion 10 </ b> C.

Moreover, in the said embodiment, the protective layer 40 was provided in the whole inner surface FC in 10 C of bending parts. However, the protective layer 40 may be provided only on the second wiring 32 provided inside the bent portion 10C.
Moreover, it may replace with the protective layer 40 of the said embodiment, and the protective layer 140 shown in FIG. 7 may be provided. The protective layer 140 is formed on the region AR2 other than the region AR1 of the portion adjacent to the first insulating sheet portion 10A and the second insulating sheet portion 10B on the inner surface FC of the bent portion 10C, and on the second wiring 32. Is provided. When such a protective layer 140 is provided, the second wiring 32 can be further protected by the protective layer 140 as compared with the case where the protective layer is provided only on the second wiring 32 provided in the bent portion 10C. it can.
FIG. 8 is a view showing a load detection sensor unit obtained by replacing the protective layer 40 of the load detection sensor unit 1 shown in FIG. 1 with the protective layer 140 shown in FIG. As shown in FIG. 8, when the protective layer 140 is applied instead of the protective layer 40 of the above embodiment, there is a gap C between the protective layer 140 and the spacer 50 other than the portion where the second wiring 32 is provided. Is formed. There is a gap C between the spacer 50 sandwiched between the first insulating sheet portion 10A and the second insulating sheet portion 10B and the bent portion 10C connected to the first insulating sheet portion 10A and the second insulating sheet portion 10B. Thus, a state in which the connecting portion between the insulating sheet portions 10A and 10B in a substantially parallel state and the bent portion 10C in a bent state is raised and thickened is reduced, and the state transition is easily smoothed.

  In the above embodiment, the resistance R is a printing resistance. However, the resistor R may be a chip resistor. When the resistor R is a chip resistor, for example, one of the tail blocks B12 in the first insulating sheet portion 10A is not disposed between the first insulating sheet portion 10A and the spacer 50 as in the above embodiment. Of these surfaces FA, the spacer 50 may be disposed on the exposed surface EF where the spacer 50 is not opposed.

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

  The present invention has applicability as long as it detects the presence or absence of a load on a detection object whose load is to be detected. That is, in the above-described embodiment, the presence or absence of a load due to the seating of a person is detected, but the present invention is not limited to the above-described embodiment, and other forms can be adopted. For example, the form which arrange | positions the load detection sensor unit 1 or the load detection sensor 3 to the seat cushion (bed mat) of the bed for nursing care is mentioned. Even in such a form, the load detection sensor 3 can detect the load, and based on the detection result of the load detection sensor 3, information indicating that a person is present on the seat cushion (bed mat) is provided. Can be obtained. The present invention can also be used to detect a pressing force as a load by disposing the load detection sensor 3 as a switch of an electronic device or the like.

DESCRIPTION OF SYMBOLS 1 ... Load detection sensor unit 2 ... Base 3 ... Load detection sensor 10 ... Insulation sheet 10A ... 1st insulation sheet part 10B ... 2nd insulation sheet part 10C ... Bending part 11 ... 1st electrode 12A, 12B ... terminal 21 ... 2nd electrode 31 ... 1st wiring 32 ... 2nd wiring 40 ... protective layer 50 ... spacer 60 ... S spring R ... resistance SC ... seat cushion

Claims (7)

A spacer having an opening;
An insulating sheet that has flexibility and is bent so as to sandwich the spacer;
With
The insulating sheet is disposed on one surface side of the spacer and has a first insulating sheet portion provided with a first electrode at a position overlapping the opening, and the insulating sheet is disposed on the other surface side of the spacer and passes through the opening. A second insulating sheet portion provided with a second electrode facing the first electrode, and a bent portion connected to the first insulating sheet portion and the second insulating sheet portion and bent.
The first insulating sheet portion is provided with a pair of terminals,
The first electrode is electrically connected to one of the pair of terminals via a first wiring provided in the first insulating sheet portion,
The second electrode is electrically connected to the other of the pair of terminals via a second wiring provided to extend to the first insulating sheet portion, the bent portion, and the second insulating sheet portion. And
A load detection sensor unit, wherein a protective layer is provided on the second wiring inside the bent portion. The protective layer is provided on at least a region other than a region adjacent to the first insulating sheet portion and the second insulating sheet portion on the inner surface of the bent portion, and on the second wiring. The load detection sensor unit according to claim 1, wherein 3. The load detection sensor unit according to claim 1, wherein a gap is formed between the protective layer and the spacer other than a portion where the second wiring is provided. 4. The thickness of the said protective layer is made thinner than the thickness of the said spacer, The load detection sensor unit of any one of Claims 1-3 characterized by the above-mentioned. The load detection sensor unit according to claim 1, further comprising a winding core portion around which the bending portion is wound. The load according to claim 5, further comprising a pedestal having a placement portion on which the first insulating sheet portion is placed and the winding core portion that is spaced apart from the placement portion. Detection sensor unit. A resistor provided on the surface of the first insulating sheet portion;
The load detection sensor according to any one of claims 1 to 6, wherein the resistor is electrically connected to the first wiring and the second wiring, or the pair of terminals. unit.

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