JP5878070B2 - Seat sensor and seat device - Google Patents

Description

  The present invention relates to a seating sensor and a seat device, and is suitable in the technical field of detecting seating.

  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 in the state where seating of a person is detected. Patent Document 1 below has been proposed as a seating sensor used in such an alarm system.

  In Patent Document 1, a seating sensor is disposed between a seat cover and a cushion pad covered with the seat cover. The seating sensor has a pair of film sheets opposed to each other with a spacer interposed therebetween, and the upper electrode and the lower electrode provided on the opposed surfaces of the film sheet come into contact when receiving a load from the cushion pad. ing.

JP 09-315199 A

  However, since the seating sensor of Patent Literature 1 is disposed on the seating surface side of the cushion pad, the seating sensor may cause a sense of incongruity due to the seating sensor. As one of the countermeasures for preventing such a sense of incongruity, it is conceivable to fix a seating sensor on the lower surface side of the cushion pad.

  However, for example, in a cushion pad placed on a spring stretched over a frame member, a space below a part of the lower surface of the cushion pad is a space, and a seating sensor is fixed to such a region. There may be cases where you have to.

  In such a case, even if a load is applied to the cushion pad, there is a problem that since the space is in the lower part, the stress against the load hardly acts on the lower side of the seating sensor and the seating cannot be detected properly. The

  Accordingly, an object of the present invention is to provide a seating sensor that can appropriately detect seating even if the lower surface of the cushion pad is fixed to a space that is a space below, and a seat device having such a seating sensor. To do.

  As a result of intensive studies to solve the above-mentioned problems, the present inventor cannot properly detect the seating when the seating sensor of Patent Document 1 is arranged in a region where the lower side is a space on the lower surface of the cushion pad. Was revealed. That is, when the cushion pad is bent so as to press the pair of film sheets, the pair of film sheets are bent in a shape substantially equivalent to the bent shape of the cushion pad, so that the film sheets are not easily contacted with each other. This is because the contact pressure is weak. Therefore, the pressure sensitive switch is not turned on, and seating cannot be detected properly.

  Therefore, as a result of further earnest studies, the present inventor has reached the present invention capable of solving the above problems.

  That is, the present invention is a seating sensor that is fixed to a region where the lower side is a space on the lower surface of the cushion pad, and a part of the surface is opposed to the first electrode and the first electrode. A part of the surface of the first electrode sheet is a second electrode, and an opening is formed between the first electrode and the second electrode, and the second electrode sheet positioned on the seating surface side of the cushion pad with respect to the first electrode sheet. A pressure-sensitive switch formed and having a sheet-like spacer interposed between the first electrode sheet and the second electrode sheet, the rigidity of the first electrode sheet being larger than the rigidity of the second electrode sheet It is characterized by that.

  According to such a seating sensor, when the cushion electrode is bent and the second electrode sheet is pressed, the second electrode sheet is bent so as to enter the opening of the spacer in response to the pressing. On the other hand, since the space below the seating sensor is a space, stress hardly acts on the first electrode sheet from below the seating sensor, but the first electrode sheet is pressed from above via the second electrode sheet. . The amount of bending of the first electrode sheet at this time is smaller than that of the second electrode sheet because the rigidity of the first electrode sheet is larger than the rigidity of the second electrode sheet. Therefore, the position of the first electrode of the first electrode sheet is closer to the position of the second electrode of the second electrode sheet than when the rigidity of the first electrode sheet is equal to or less than that of the second electrode sheet. As a result, the contact pressure between the electrodes is increased, and the sensitivity of the pressure sensitive switch is improved. In this way, a seating sensor is provided that can detect seating properly even when the cushion pad is disposed in a region where the lower side is a space on the lower surface of the cushion pad.

  In addition, it is preferable that the first electrode sheet includes a reinforcing member, and the rigidity of the first electrode sheet is greater than the rigidity of the second electrode sheet by the reinforcing member.

  In this case, even if the sheets constituting the first electrode sheet and the second electrode sheet are made of the same material and have the same thickness, the amount of bending of the first electrode sheet is reduced by the reinforcing member. Compared to, it can be significantly reduced. In addition, the sensitivity of the pressure sensitive switch can be adjusted without changing the structure of the pressure sensitive switch.

  Further, the first electrode sheet may have a thickness larger than the thickness of the second electrode sheet, and the rigidity of the first electrode sheet may be greater than the rigidity of the second electrode sheet.

  In this case, the rigidity of the first electrode sheet can be increased without using other members, without increasing the number of parts.

  In addition, the first electrode sheet may be a material harder than the material of the second electrode sheet, and the rigidity of the first electrode sheet may be greater than the rigidity of the second electrode sheet.

  In this case, the first electrode sheet can be thinned without increasing the number of parts.

  The first electrode sheet is preferably made of a metal plate, and a surface portion of the metal plate facing the second electrode through the opening also serves as the first electrode.

  In this case, since the first electrode sheet is generally a metal plate having no flexibility, the contact pressure between the electrodes is further increased, and the sensitivity of the pressure sensitive switch is improved. In addition to this, the number of parts can be reduced and the thickness can be reduced as compared with the case where the electrode is disposed as a separate member on one surface of the first electrode sheet.

  Further, the present invention is a seat device, a part of which is placed on the placement member, and the other part is not placed on the placement member, and the cushion pad in which the space is below, and any one of the above The seating sensor is arranged on at least a part of the other part that is not placed on the placement member in the cushion pad and has a space below.

  In such a seat device, when a load is applied to the cushion pad, the cushion pad is deformed and presses the second electrode sheet disposed on the seating surface side of the cushion pad, and the second electrode sheet changes in response to the pressing. It bends to enter the opening of the spacer. On the other hand, since the space below the seating sensor is a space, the stress caused by the load applied to the cushion pad hardly acts on the lower side of the first electrode sheet, but the first from the upper side through the second electrode sheet. The electrode sheet is pressed. The amount of bending of the first electrode sheet at this time is smaller than that of the second electrode sheet because the rigidity of the first electrode sheet is larger than the rigidity of the second electrode sheet. Therefore, the position of the first electrode of the first electrode sheet is closer to the position of the second electrode of the second electrode sheet than when the rigidity of the first electrode sheet is equal to or less than that of the second electrode sheet. As a result, the contact pressure between the electrodes is increased, and the sensitivity of the pressure sensitive switch is improved. Thus, there is provided a seat device that can appropriately detect the seating even if the lower surface of the cushion pad is disposed in a region where the space is a lower portion.

  In addition, a recess is formed on the lower surface of the cushion pad, and a gap is formed between a region above the second electrode on the upper surface of the second electrode sheet and the bottom of the recess. It is preferable that at least a part of the region is fixed to the lower surface of the cushion pad.

  When a gap is formed between the bottom of the recess formed in the lower surface of the cushion pad and the region above the electrode on the upper surface of the second electrode sheet, compared to the case where the gap is not formed, It is possible to reduce the fact that the pressure sensitive switch is turned on by the load applied to the cushion pad when a light load or the like is placed. In addition, the sensitivity of the pressure sensitive switch can be adjusted depending on the size of the gap. As described above, the erroneous detection can be structurally reduced without depending on the fact that the erroneous detection is electrically determined. On the other hand, since at least a part of the region other than such a region is fixed to the lower surface of the cushion pad, the lower surface of the cushion pad functions as a stopper that prevents the pressure sensitive switch from moving above the cushion pad. Therefore, for example, even when the cushion pad moves up and down due to vibration or the like, it is possible to prevent the pressure sensitive switch and the cushion pad from contacting each other due to the vertical movement and the pressure sensitive switch from being turned on. be able to.

  The concave portion includes a first concave portion formed on a lower surface of the cushion pad and a second concave portion formed in a part of a bottom of the first concave portion, and the gap includes the region and the second Preferably, at least a part of the other region is formed between the bottom of the recess and the bottom of the first recess, and the pressure sensitive switch is accommodated in the space of the first recess.

  In such a case, even if a part of the seating sensor is not sandwiched between the cushion pad and the mounting member of the cushion pad, it is possible to prevent the seating sensor from being damaged due to the sandwiching.

  As described above, according to the present invention, the seating sensor that can properly detect the seating even if the pressure-sensitive switch is arranged in the space where the lower side is a space on the lower surface of the cushion pad, and the seat having such a seating sensor An apparatus is provided.

It is a perspective view showing roughly the seat device in a 1st embodiment. It is a disassembled perspective view which shows the structure of a seating sensor. It is a figure which shows a mode that the seating sensor was seen from the upper side, and the mode of the cross section of a seating sensor. It is a figure which shows the equivalent circuit of a seating sensor. It is a figure which shows the mode that the seat apparatus was seen from the upper side, and the mode of the cross section of a seat apparatus. It is a figure which shows a mode that a pressure sensitive switch turns on from the same viewpoint as (B) of FIG. It is a figure which shows the seat apparatus in 2nd Embodiment from the same viewpoint as (B) of FIG. It is a figure which shows the seat apparatus in 3rd Embodiment from the same viewpoint as (B) of FIG. It is a figure which shows the seat apparatus in 4th Embodiment from the same viewpoint as (B) of FIG. It is a figure which shows the seat apparatus in 5th Embodiment from the same viewpoint as (B) of FIG. It is a figure which shows the seat apparatus in 6th Embodiment from the same viewpoint as (B) of FIG. It is the schematic where it uses for description of the relationship between the opening of a spacer, and a cushion member.

(1) 1st Embodiment 1st Embodiment suitable for the seat apparatus which concerns on this invention is described in detail, using drawing.

  FIG. 1 is a perspective view schematically showing a seat device 1 according to the first embodiment. As shown in FIG. 1, the seat device 1 according to the first embodiment includes a seating sensor 2, a cushion pad 3, and a metal seat pan 4 that is a mounting member for the cushion pad 3 as main components. Prepare.

  FIG. 2 is an exploded perspective view showing the configuration of the seating sensor 2. As shown in FIG. 2, the seating sensor 2 includes a first electrode sheet 10, a second electrode sheet 20, a spacer 30, and a cushion member 40 as main components.

  The first electrode sheet 10 includes a first insulating sheet 11, a plurality of first electrodes 12A and 12B, a pair of terminals 13A and 13B, a plurality of first wires 14A to 14D, and a reinforcing member 50.

  The first insulating sheet 11 has a flexible film shape and is connected to a substantially rectangular main block B1 and one end of the main block B1 in the short direction, and is a substantially rectangular sub-block smaller than the main block B1. B2. Examples of the material of the first insulating sheet 11 include resins such as polyethylene terephthalate (PET), polybutylene terephthalate (PBT), and polyethylene naphthalate (PEN).

  The first electrodes 12 </ b> A to 12 </ b> D each have a substantially circular shape and are arranged on one surface of the first insulating sheet 11 in a state of being aligned in the same straight line. Each of the pair of terminals 13A and 13B has a substantially rectangular shape, and is disposed on the same surface as the surface on which the first electrodes 12A to 12D are disposed in the sub-block B2.

  The first electrode 12A and the first electrode 12B are electrically connected by the first wiring 14A, and the first electrode 12C and the first electrode 12D are electrically connected by the first wiring 14B. The first wiring 14A and the terminal 13A are electrically connected by the first wiring 14C, and the first wiring 14B and the terminal 13B are electrically connected by the first wiring 14D.

  The reinforcing member 50 is a member that reinforces the first electrode sheet 10 and makes the rigidity of the first electrode sheet 10 larger than the rigidity of the second electrode sheet 20, and the first electrode 12 </ b> A is arranged on the first insulating sheet 11. It is affixed to the opposite side of the surface.

  Examples of the material of the reinforcing member 50 include metals, in addition to resins such as polycarbonate (PC), PET, PBT, and PEN. However, from the viewpoint of making the rigidity of the first electrode sheet 10 greater than the rigidity of the second electrode sheet 20, it is preferable to use the reinforcing member 50 made of a material harder than the material of the second insulating sheet 21.

  The thickness of the reinforcing member 50 is not particularly limited, but from the viewpoint of making the rigidity of the first electrode sheet 10 greater than the rigidity of the second electrode sheet 20, the total thickness of the first insulating sheet 11 is the first thickness. It is preferable to use the reinforcing member 50 having a relationship larger than the thickness of the two insulating sheets 21. The shape of the reinforcing member 50 may be the same as or different from that of the first insulating sheet 11. If they are different, the reinforcing member 50 is preferably provided at least below the first electrodes 12A to 12D.

  The second electrode sheet 20 includes a second insulating sheet 21, second electrodes 22A to 22D, and second wirings 24A to 24C.

  The second insulating sheet 21 has a flexible film shape and has the same shape and size as the main block B <b> 1 in the first insulating sheet 11. Examples of the material of the second insulating sheet 21 include resins such as PET, PBT, and PEN.

  The second electrodes 22 </ b> A to 22 </ b> D each have a substantially circular shape and are arranged on one surface of the second insulating sheet 21 in a state of being aligned in the same straight line. In the present embodiment, the size of the second electrodes 22A to 22D is the same as that of the first electrodes 12A to 12D, and the arrangement positions of the second electrodes 22A to 22D are the positions of the first electrodes 12A to 12D with respect to the main block B1. It is relatively the same as the arrangement position.

  The second electrode 22A and the second electrode 22B are electrically connected by the second wiring 24A, and the first electrode 22C and the second electrode 22D are electrically connected by the second wiring 24B. The second wiring 24A and the second wiring 24B are electrically connected by the second wiring 24C.

  The spacer 30 has the same shape and size as the main block B1 in the first insulating sheet 11, and has a plurality of openings 31A to 31D. Examples of the material of the spacer 30 include resins such as PET, PBT, and PEN.

  The openings 31A to 31D have a substantially circular periphery, and the diameters of the openings 31A to 31D are slightly smaller than the diameters of the first electrodes 12A to 12D. In addition, the arrangement positions of the openings 31A to 31D are relatively the same as the arrangement positions of the first electrodes 12A to 12D with respect to the main block B1.

  In each of the openings 31A to 31D, slits 32A to 32D that are spatially connected to the outside of the spacer 30 are formed. That is, one end of each of the slits 32 </ b> A to 32 </ b> D is connected to the corresponding opening 31 </ b> A to 31 </ b> D, and the other end is opened to the side of the spacer 30.

  The cushion member 40 is an elastic member that deforms so as to be crushed when pressure is applied, and is formed of, for example, a sponge-like resin provided with a large number of holes, a nonwoven fabric in which resin fibers are entangled, rubber, or the like. . In the case of the present embodiment, the elasticity of the cushion member 40 is greater than the elasticity of the cushion pad 3, the shape of the cushion member 40 is a substantially rectangular parallelepiped shape, and its wide surface is larger than the wide surface of the second insulating sheet 21. Is also a small area.

  FIG. 3 is a diagram illustrating a state of the seating sensor 2 as viewed from above and a cross-sectional state of the seating sensor 2. Specifically, FIG. 3A is a view showing the seating sensor 2 as viewed from above, and FIG. 3B is a cross-sectional view taken along line VV in FIG. It is a figure which shows a mode.

  As shown in FIG. 3B, the first electrode sheet 10 is affixed to one surface of the spacer 30 and the second electrode sheet 20 is affixed to the other surface of the spacer 30 to form one structure. SSB (hereinafter referred to as sheet structure).

  In this sheet structure SSB, a part of a pair of insulating sheets 11 and 21, a spacer part interposed between these sheet parts, and a pair of electrodes 12A and 22A facing each other through an opening 31A provided in the spacer part, Constitutes a pressure sensitive switch SW1. The part of the insulating sheets 11 and 21 is a part where at least an electrode is disposed.

  In the sheet structure SSB, pressure sensitive switches SW2 to SW4 shown in FIG. 3A are configured in the same manner as the pressure sensitive switch SW1. In this embodiment, the insulating sheets and spacers, which are constituent elements of the pressure sensitive switches SW1 to SW4, are part of one insulating sheet 11 and 21 and the spacer 30, but are separated for each part. The insulating sheet and the spacer may be connected by a predetermined connector.

  In the second insulating sheet 21 of such a sheet structure SSB, a surface opposite to the surface facing the spacer 30 is an upper surface, and the second insulating sheet 21 is interposed in a substantially central region of this surface. A cushion member 40 covering the openings 31A and 31B is attached.

  In addition, as shown to (A) of FIG. 3, in the area | region where the cushion member 40 is affixed among the upper surfaces of the 2nd insulating sheet 21, electrode 12A, 22A, 12B which comprises pressure sensitive switch SW1 and SW2, and 22B, 12C and 22C, and the area | region which hits 12D and 22D is contained. In other words, the pressure sensitive switches SW1 to SW4 do not exist immediately below the peripheral area AR where the cushion member 40 is not attached to the upper surface of the seating sensor 2.

  FIG. 4 is a diagram showing an equivalent circuit of the seating sensor 2. As shown in FIG. 4, the set STA of the pressure sensitive switches SW1 and SW2 and the set STB of the pressure sensitive switches SW3 and SW4 are connected in parallel. Further, these sets STA and STB are connected in series, and are arranged between the pair of terminals 13A and 13B.

  FIG. 5 is a diagram illustrating a state in which the seat device 1 is viewed from above and a cross-sectional state of the seat device 1. Specifically, FIG. 5A is a view showing the seat device 1 as viewed from above, and FIG. 5B is a cross-sectional view taken along the line WW in FIG. It is a figure which shows a mode.

  As shown to (A) of FIG. 5, the cushion pad 3 is provided with the backrest part 3A and the seat part 3B as main components. The backrest 3A and the seat 3B are elastic members that are deformed so as to be crushed when pressure is applied, and are connected by a predetermined connector. In addition, examples of the material of the elastic member include urethane foam.

  As shown in FIGS. 5A and 5B, the bottom of the seat portion 3B has a first groove 61 (hereinafter referred to as a shallow concave portion) 61 along the width direction of the cushion pad 3, for example. It is formed. A second groove 62 (hereinafter referred to as a deep recess) that is narrower than the width of the shallow recess 61 is formed as a second step along the longitudinal direction of the shallow recess 61 at a part of the bottom of the shallow recess 61. Is done.

  As shown in FIG. 5B, the depth DP1 of the shallow recess 61 is larger than the thickness TH1 of the sheet structure SSB, and the sheet structure SSB is accommodated in the space SP1 of the shallow recess 61.

  The peripheral region AR (FIG. 3A) on the upper surface of the second insulating sheet 21 in the sheet structure SSB is attached to the bottom surface of the shallow recess 61 where the deep recess 62 is not formed by the adhesive AD, and is seated. The sensor 2 is fixed to the lower surface of the cushion pad 3.

  The part where the seat structure SSB is arranged is a part where the cushion pad 3 is not placed on the seat 3B and the space is below. In other words, the lower surface of the seating sensor 2 fixed to the lower surface of the cushion pad 3 and the region immediately below the pressure sensitive switches SW1 to SW4 is in contact with the air layer.

  Although the side surface of the shallow recess 61 shown in FIG. 5B and the side surface of the sheet structure SSB are in contact with each other, they may be in a state having a gap. However, it is preferable that the side surface of the seat structure SSB is in a contact state from the viewpoint of preventing the displacement of the seating sensor 2 and from the viewpoint of strengthening the fixing state of the seat portion 3B and the seating sensor 2.

  The depth DP2 of the deep recess 62 is larger than the thickness TH2 of the cushion member 40. In the space SP2 of the deep recess 62, a gap GP is formed between the bottom surface of the deep recess 62 and the top surface of the cushion member 40 facing the bottom surface. The cushion member 40 is accommodated in a certain state. In addition, although the side surface of the deep recessed part 62 shown by FIG. 5 (B) and the side surface of the cushion member 40 have a gap, they may be in a contact state.

  As shown in FIG. 5A, the shallow concave portion 61 and the deep concave portion 62 in this embodiment are regions on the inner side of the peripheral portion of the lower surface of the seat portion 3 </ b> B and are normally seated on the cushion pad 3. It is formed at a position ahead of the person's hip point HP. For this reason, each pressure-sensitive switch SW1-SW4 of the seating sensor 2 accommodated in the space SP1 of the shallow recess 61 is disposed in front of the hip point HP of the person who normally sits on the cushion pad 3.

  “Regular seating” means sitting with the back in contact with the backrest and the buttocks located deep in the seat, and “hip point” means the hips of a person who is seated It means the part that is at the bottom.

  FIG. 6 is a diagram illustrating a state in which the pressure-sensitive switch SW1 is turned on from the same viewpoint as FIG. As shown in FIG. 6, when a person is seated on the cushion pad 3 of the seat device 1 placed on the seat pan 4, pressure is applied from both the seat surface side and the lower surface side in the seat portion 3B (see arrows). .

  In this case, on the seating surface side of the cushion pad 3, the cushion pad portion above the cushion member 40 is deformed so as to be bent and comes into contact with the upper surface of the cushion member 40 to press the cushion member 40. Due to this pressing force, the cushion member 40 is deformed so as to be crushed, and the second insulating sheet 21 is pressed by this deformation. Since the second insulating sheet 21 is flexible, the second insulating sheet 21 enters the opening 31 </ b> A of the spacer 30 interposed between the second insulating sheet 21 and the first insulating sheet 11 according to the pressing of the cushion pad 3. Bend.

  On the other hand, on the lower surface side of the cushion pad 3, since the space between the lower surface of the seating sensor 2 and the seating surface of the seat pan 4 is a space, the stress caused by the load applied to the cushion pad 3 is the first insulation. There is almost no work from the lower side of the sheet 11. However, when the cushion portion on the seating surface side of the cushion pad 3 presses the second insulating sheet 21 via the cushion member 40, the first insulating sheet 11 is also pressed.

  In the case of the present embodiment, a reinforcing member 50 that reinforces the first insulating sheet 11 is attached to the lower surface of the first insulating sheet 11, and the rigidity of the first electrode sheet 10 is increased by the reinforcing member 50 to the second electrode. The relationship is greater than the rigidity of the sheet 20. For this reason, the amount of bending of the first insulating sheet 11 is significantly smaller than that of the second insulating sheet 21.

  In this way, the first electrode 12A and the second electrode 22A facing each other through the opening 31A come into contact with each other with a certain pressure or more by bending the second insulating sheet 21 so that only the second insulating sheet 21 enters the opening 31. Are connected and become conductive, and the pressure sensitive switch SW1 is turned on.

  In the case of the present embodiment, the opening 31A is formed with a slit 32A (FIG. 2) that communicates the opening with the outside. For this reason, when the 1st insulating sheet 11 and the 2nd insulating sheet 21 bend, the air of 31 A of opening is discharged | emitted through the slit 32A, without staying in an opening. That is, it is avoided that the bending of the first insulating sheet 11 and the second insulating sheet 21 is suppressed by the air in the opening 31. Therefore, compared with the case where the slit 32A is not formed, the first electrode 12A and the second electrode 22A are easily in contact with each other, and the sensitivity of the pressure sensitive switch SW1 itself can be improved.

  In the case of the present embodiment, the cushion member 40 having elasticity greater than the elasticity of the cushion pad 3 is provided on the surface of the second insulating sheet 21 opposite to the surface facing the spacer 30. 2 Cover the opening 31 </ b> A through the insulating sheet 21.

  For this reason, regardless of the degree (hardness) of the elastic deformation in the cushion pad 3, the cushion member 40 is deformed equally, and the second insulating sheet 21 can enter the opening 31 </ b> A of the spacer 30. Therefore, the insulating sheet can be appropriately bent regardless of the degree (hardness) of elastic deformation in the cushion pad 3. Further, the sensitivity of the pressure sensitive switch SW1 can be adjusted by the thickness of the cushion member 40.

  The matters described for the pressure sensitive switch SW1 are the same for the other pressure sensitive switches SW2 to SW4.

  By the way, the load applied by the person who normally sits on the cushion pad 3 is concentrated on the hip point on the seating surface of the seat portion 3B, but in the seat pan 4 on which the cushion pad 3 is placed, the load is applied to the hip point HP. Compared to the front, it becomes larger.

  This is because the gravity of the thigh extending forward from the buttocks of the person who normally sits works in the vertical direction, and the gravity of the buttocks works in the forward direction in addition to the vertical direction.

  In the case of the present embodiment, as shown in FIG. 5A, the pressure sensitive switches SW1 to SW4 are accommodated in a shallow recess 61 formed in front of the hip point HP on the lower surface of the seat portion 3B. Therefore, since the pressure sensitive switches SW1 to SW4 receive a larger pressing force than the case where they are arranged in the vertical direction of the hip point HP, the sensitivity of the pressure sensitive switches SW1 to SW4 can be improved.

  Further, since the pressure sensitive switches SW1 to SW4 are arranged on the lower surface side of the seat portion 3B in the cushion pad 3, the pressure sensitive switches SW1 to SW4 are compared with the case where the pressure sensitive switches SW1 to SW4 are arranged on the seat surface side of the seat portion 3B. The uncomfortable feeling of sitting due to the arrangement can be reduced.

  Further, the pressure sensitive switches SW1 and SW2 are arranged on the right side and the pressure sensitive switches SW3 and SW4 are arranged on the left side with respect to the vertical plane VF passing through the center of the cushion pad 3 in the width direction. The heel of a person sitting on the cushion pad 3 is generally located on the left and right with respect to the vertical plane VF, whereas the luggage is not necessarily located on the left and right with respect to the vertical plane VF. Therefore, it is more erroneous than when both the pressure sensitive switches SW1 and SW2 and the pressure sensitive switches SW3 and SW4 are arranged on the left side or the right side, or when the pressure sensitive switches SW1 to SW4 are arranged in a vertical plane VF. Detection can be suppressed.

  It is preferable that the pressure sensitive switch SW1 arranged on the left side of the vertical plane VF and the pressure sensitive switch SW4 arranged on the right side of the vertical plane VF are arranged symmetrically with respect to the vertical plane VF. The same applies to the pressure-sensitive switch SW2 disposed on the left side of the vertical plane VF and the pressure-sensitive switch SW3 disposed on the right side of the vertical plane VF.

  The pressure sensitive switches SW <b> 1 to SW <b> 4 are arranged on the same line in the width direction of the cushion pad 3. The pelvis of a person sitting on the cushion pad 3 is generally in a state of spreading in the width direction of the cushion pad 3. Therefore, the sensitivity of the pressure sensitive switches SW1 to SW4 can be improved as compared with the case where the pressure sensitive switches SW1 to SW4 are arranged on the same line in the front-rear direction.

  As described above, in the seat device 1 according to the present embodiment, as shown in FIG. 5B, the lower surface of the cushion pad 3 is not placed on the seat portion 3 </ b> B and the lower portion is a space. The seating sensor 2 is fixed. As shown in FIG. 3, the seating sensor 2 includes a pressure sensitive switch SW <b> 1 having a first electrode sheet 10, a second electrode sheet 20, and a sheet-like spacer 30.

  Part of the surface of the first electrode sheet 10 constituting the pressure sensitive switch SW1 is the first electrodes 12A to 12D. In addition, the second electrode sheet 20 constituting the pressure sensitive switch SW <b> 1 is configured such that a part of the surface thereof is the second electrodes 22 </ b> A to 22 </ b> D opposed to the first electrodes 12 </ b> A to 12 </ b> D. It is located on the seat surface side of the pad 3B. On the other hand, the spacer 30 has openings 31A to 31D formed between the first electrodes 12A to 12D and the second electrodes 22A to 22D, and is interposed between the first electrode sheet 10 and the second electrode sheet 20.

  In such a seat device 1, as shown in FIG. 6, when a load is applied to the cushion pad 3, the cushion pad 3 is deformed and the second electrode sheet 20 disposed on the seat surface side of the cushion pad 3 is disposed. Press through the cushion member 40. In response to this pressing, the second electrode sheet 20 bends so as to enter the opening 31 </ b> A of the spacer 30. On the other hand, since the space below the pressure sensitive switch SW1 is a space, the stress due to the load applied to the cushion pad 3 hardly acts on the lower side of the first electrode sheet 10, but the cushion pad 3 The first electrode sheet 10 is pressed from above via the electrode sheet 20.

  The amount of bending of the first electrode sheet 10 at this time is significantly smaller than that of the second electrode sheet 20 because the rigidity of the first electrode sheet 10 is greater than the rigidity of the second electrode sheet 20. Become.

  Accordingly, the position of the first electrode 12A of the first electrode sheet 10 and the position of the second electrode 22A of the second electrode sheet 20 are compared with the case where the rigidity of the first insulating sheet 11 is equal to or less than that of the second insulating sheet 21. And will be close. As a result, the contact pressure between the first electrode 12A and the second electrode 22A is increased, and the sensitivity of the pressure sensitive switch SW1 is improved.

  Thus, even if the lower side of the cushion pad 3 is disposed in a region where the space is a lower side, the seating is appropriately detected.

  In the case of the present embodiment, the first electrode sheet 10 includes a reinforcing member 50, and the rigidity of the first electrode sheet 10 is greater than the rigidity of the second electrode sheet 20 by the reinforcing member 50.

  Therefore, even when the first insulating sheet 11 of the first electrode sheet 10 and the second insulating sheet 21 of the second electrode sheet 20 are made of the same material and have the same thickness, the first electrode sheet is formed by the reinforcing member 50. The amount of bending of 10 can be significantly reduced as compared with the second electrode sheet 20. In addition, as long as the thickness, material, etc. of the reinforcing member 50 are changed, the sensitivity of the pressure sensitive switch SW1 can be adjusted without changing the structure of the pressure sensitive switch SW1 itself.

  In the case of the present embodiment, a shallow recess 61 and a deep recess 62 are formed on the lower surface of the seat portion 3B in the cushion pad 3, and a region above the electrode 22A on the upper surface of the second insulating sheet 21 and a bottom of the deep recess 62 A gap GP is formed between the two.

  Therefore, compared to the case where such a gap GP is not formed, it is reduced that the pressure-sensitive switch SW1 is turned on by a load applied to the cushion pad when a load lighter than a person is placed. be able to. Further, the sensitivity of the pressure sensitive switch SW1 can be adjusted by the size of the gap GP. As described above, the erroneous detection can be structurally reduced without depending on the fact that the erroneous detection is electrically determined.

  On the other hand, the peripheral area AR of the area above the electrode 22 </ b> A on the upper surface of the second insulating sheet 21 is fixed to the lower surface of the seat portion 3 </ b> B (the bottom surface of the shallow recess 61) in the cushion pad 3.

  Therefore, the lower surface of the seat portion 3B functions as a stopper that prevents the pressure sensitive switch SW1 from moving above the seat portion 3B. Therefore, for example, even when the cushion pad 3 moves up and down due to vibration or the like, the pressure sensitive switch SW1 and the cushion pad 3 come into contact with each other due to the vertical movement and the pressure sensitive switch SW1 is turned on. It can be avoided in advance.

  In the case of the present embodiment, the entire seating sensor 2 having the pressure sensitive switch SW1 is accommodated in the spaces SP1 and SP2 of the shallow recess 61 and the deep recess 62.

  For this reason, even if the seating sensor 2 is not pinched | interposed between the cushion pad 3 and the seat pan 4 which is the mounting member of the cushion pad 3, it is not. Accordingly, it is possible to prevent the seating sensor 2 from being damaged due to such pinching.

(2) 2nd Embodiment Next, 2nd Embodiment suitable for the seat apparatus which concerns on this invention is described in detail, using drawing. However, among the constituent elements of the seat device in the second embodiment, constituent elements that are the same as or equivalent to those in the first embodiment are assigned the same reference numerals, and redundant descriptions are omitted as appropriate.

  FIG. 7 is a diagram illustrating the seat device according to the second embodiment from the same viewpoint as FIG. As shown in FIG. 7, in the seat device 1 of the present embodiment, the reinforcing member 50 is omitted, and the thickness of the first insulating sheet 11 in the first electrode sheet 10 is the second insulating sheet in the second electrode sheet 20. It differs from the seat apparatus 1 of 1st Embodiment by the point made larger than the thickness of 21. FIG.

  In the case of the present embodiment, the first insulating sheet 11 has a thickness larger than the thickness of the second insulating sheet 21, and the rigidity of the first electrode sheet 10 is larger than the rigidity of the second electrode sheet 20.

  Note that the materials of the first insulating sheet 11 and the second insulating sheet 21 may be the same or different. However, the rigidity of the first electrode sheet 10 is greater than the rigidity of the second electrode sheet 20.

  As described above, the first insulating sheet 11 has a thickness larger than the thickness of the second insulating sheet 21, and the rigidity of the first electrode sheet 10 can be greater than the rigidity of the second electrode sheet 20. In this case, compared to the first embodiment in which the thicknesses of the first insulating sheet 11 and the second insulating sheet 21 are equal, the number of components is not increased without using other members, and the first electrode sheet 10 Stiffness can be increased.

(3) Third Embodiment Next, a third embodiment suitable for the seat device according to the present invention will be described in detail with reference to the drawings. However, among the components of the seat device in the third embodiment, components that are the same as or equivalent to those in the first embodiment are assigned the same reference numerals, and redundant descriptions are omitted as appropriate.

  FIG. 8 is a diagram illustrating the seat device according to the third embodiment from the same viewpoint as FIG. As shown in FIG. 8, in the seat device 1 of the present embodiment, the reinforcing member 50 is omitted, and the first insulating sheet 11 in the first electrode sheet 10 is replaced by the second insulating sheet 21 in the second electrode sheet 20. This is also different from the seat device 1 of the first embodiment in that it is made of a hard material.

  In the case of the present embodiment, the first insulating sheet 11 is a material harder than the material of the second insulating sheet 21, and the rigidity of the first electrode sheet 10 is greater than the rigidity of the second electrode sheet 20. For example, the first insulating sheet 11 is PEN, and the second insulating sheet 21 is PET.

  In addition, although the thickness of the 1st insulating sheet 11 and the 2nd insulating sheet 21 is made the same in FIG. 8, it may differ. However, the rigidity of the first electrode sheet 10 is greater than the rigidity of the second electrode sheet 20.

  As described above, the first insulating sheet 11 is harder than the material of the second insulating sheet 21, and the rigidity of the first electrode sheet 10 can be greater than the rigidity of the second electrode sheet 20. In this case, the number of parts is not increased and the thickness of the first electrode sheet 10 is reduced compared to the first embodiment in which the materials of the first insulating sheet 11 and the second insulating sheet 21 have the same hardness. can do.

(4) 4th Embodiment Next, 4th Embodiment suitable for the seat apparatus which concerns on this invention is described in detail, using drawing. However, among the components of the seat device in the fourth embodiment, components that are the same as or equivalent to those in the first embodiment are assigned the same reference numerals, and redundant descriptions are omitted as appropriate.

  FIG. 9 is a diagram illustrating the seat device according to the fourth embodiment from the same viewpoint as FIG. As shown in FIG. 9, the seat device 1 of this embodiment is different from that of the first embodiment in that the reinforcing member 50 is omitted and that the first electrode 12A is a metal plate and the second electrode 22A is a thin film. It is different from the seat device 1.

  In the case of the present embodiment, the rigidity of a part of the first electrode sheet 10 (the first insulating sheet portion where the first electrode 12A is disposed) is due to the thickness of the first electrode 12A being greater than the thickness of the second electrode 22A. Is larger than the rigidity of a part of the second electrode sheet 20 (second insulating sheet portion where the second electrode 22A is disposed).

  Even the seat device 1 of the present embodiment described above has the same operational effects as the first embodiment.

  When the surface of the first electrode 12A that is a metal plate is larger than the surface of the second electrode 22A that is a thin film, the rigidity of the first insulating sheet portion where the first electrode 12A is disposed is the second The rigidity of the second insulating sheet portion where the electrode 22A is disposed is further increased. Therefore, it is more preferable that the surface of the first electrode 12A, which is a metal plate, is larger than the surface of the second electrode 22A, which is a thin film, from the viewpoint of suppressing a reduction in sensitivity of the pressure sensitive switch SW1.

(5) Fifth Embodiment Next, a fifth embodiment suitable for the seat device according to the present invention will be described in detail with reference to the drawings. However, among the constituent elements of the seat device in the fifth embodiment, constituent elements that are the same as or equivalent to those in the first embodiment are assigned the same reference numerals, and redundant descriptions are omitted as appropriate.

  FIG. 10 is a diagram illustrating the seat device according to the fifth embodiment from the same viewpoint as FIG. As shown in FIG. 10, the seat device 1 of the present embodiment is the first embodiment in that the reinforcing member 50 is omitted and the first insulating sheet 11 of the first electrode sheet 10 is replaced with a metal plate 71. This is different from the seat device 1 in the form.

  In this metal plate 71, the surface portion of the metal plate 71 facing the second electrode 22 </ b> A through the opening 31 </ b> A also serves as the first electrode 12 </ b> A, and the hardness is higher than that of the second insulating sheet 21.

  As described above, in the present embodiment, the metal plate 71 having a hardness higher than that of the second insulating sheet 21 is employed as the first electrode sheet 10.

  Although the thickness of the metal plate 71 is the same as the thickness of the second insulating sheet 21 in FIG. 10, it may be different from the thickness of the second insulating sheet 21. However, the rigidity of the metal plate 71 is greater than the rigidity of the second electrode sheet 20.

  In the seat device 1 of the present embodiment described above, the first electrode sheet 10 is made larger than the rigidity of the second electrode sheet 20 by employing the metal plate 71 that is not generally flexible. For this reason, the contact pressure between the first electrode 12A and the second electrode 22A is higher than that in the first embodiment, and the sensitivity of the pressure sensitive switch SW1 is improved. In addition to this, since the metal plate 71 also serving as the first electrode 12A is the first electrode sheet 10, in the case of the first embodiment in which the first electrode sheet 10 is configured by the first insulating sheet 11 and the first electrode 12A. In comparison, the number of parts can be reduced and the thickness can be reduced.

  In addition, when the 2nd electrode 22A of the 2nd insulating sheet 21 in this embodiment is made into a thin film, as above-mentioned in 4th Embodiment, a part of 1st electrode sheet 10 (metal plate site | part which serves as the 1st electrode 12A) ) Is further greater than the rigidity of a part of the second electrode sheet 20 (the second insulating sheet portion where the second electrode 22A is disposed). Therefore, the contact pressure between the first electrode 12A and the second electrode 22A is further increased, and the sensitivity of the pressure sensitive switch SW1 is improved.

  Further, when the outer shape of the opening 31A on the first electrode 12A side in this embodiment is made smaller than the outer shape of the opening 31A on the second electrode 22A side, the rigidity of a part of the first electrode sheet 10 is the second electrode sheet. The rigidity of a part of 20 is further increased. Therefore, the contact pressure between the first electrode 12A and the second electrode 22A is further increased, and the sensitivity of the pressure sensitive switch SW1 is improved.

(6) Sixth Embodiment Next, a sixth embodiment suitable for the seat device according to the present invention will be described in detail with reference to the drawings. However, among the components of the seat device in the sixth embodiment, components that are the same as or equivalent to those in the first embodiment are given the same reference numerals, and redundant descriptions are omitted as appropriate.

  FIG. 11 is a diagram illustrating the seat device according to the sixth embodiment from the same viewpoint as that in FIG. As shown in FIG. 11, the seat device 1 of the present embodiment is different from the seat device 1 of the first embodiment in that the reinforcing member 50 is omitted.

  Further, in the seat device 1 of the present embodiment, the first insulating sheet 11 of the first electrode sheet 10 is replaced with the metal plate 71, and the second insulating sheet 21 of the second electrode sheet 20 is replaced with the metal plate 81. This is different from the seat device 1 of the first embodiment.

  In the metal plate 71, the surface portion of the metal plate 71 facing the second electrode 22A through the opening 31A also serves as the first electrode 12A. In the metal plate 81, the first electrode 12A is formed through the opening 31A. The surface portion of the opposing metal plate 81 also serves as the second electrode 22A. Note that the hardness of the metal plate 71 is greater than the hardness of the metal plate 81.

  In the seat device 1 of the present embodiment described above, the metal plate 71 that also serves as the first electrode 12A is the first electrode sheet 10, and the metal plate 81 that also serves as the second electrode 22A is the second electrode sheet 20. Therefore, in the case of the first embodiment in which the first insulating sheet 11 and the first electrode 12A constitute the first electrode sheet 10, and the second insulating sheet 21 and the second electrode 22A constitute the second electrode sheet 20. Compared to the above, the number of parts can be reduced and the thickness can be reduced.

  In addition, the number of parts is more than that of the fifth embodiment in which the metal plate 71 also serving as the first electrode 12A is the first electrode sheet 10 and the second electrode sheet 20 is configured by the second insulating sheet 21 and the second electrode 22A. And can be made thinner.

(7) Other Embodiments The first embodiment to the sixth embodiment have been described above as an example, but the present invention is not limited to these embodiments.

  For example, although the cushion member 40 is provided in the above embodiment, it may be omitted. When the cushion member 40 is omitted, the deep recess 62 is omitted, or the depth of the deep recess having a space corresponding to the gap GP can be made smaller than the depth DP2 of the deep recess 62 of the above embodiment.

  Moreover, in the said embodiment, although the groove | channel formed in the lower surface of the seat part 3B was made into the groove | channel (the shallow recessed part 61 and the deep recessed part 62) extended along the left-right direction of the said seat part 3B, before and behind the said seat part 3B It may be a groove extending along the direction.

  When pressure is applied from the seat surface side to the seat portion 3B in which such a groove is formed, the pressure is displaced along the groove extending in the front-rear direction on the lower surface of the seat portion 3B. On the other hand, when such a groove | channel is not formed, the pressure distributed in the front-back direction from the seating site | part of the cushion pad is disperse | distributed, and it exists in the tendency for a pressure not to be transmitted to the lower side of a cushion pad. These facts have been confirmed by the inventors' experiments. Therefore, when a groove extending along the front-rear direction of the seat portion 3B is formed on the lower surface of the seat portion 3B, the pressure-sensitive switch SW1 disposed in the space of the groove has a seating surface immediately above the pressure-sensitive switch SW1. Even if the seating site is displaced in the front-rear direction from the site, the same pressing force as that when the seating site is on the seating surface site is given by the deflection of the groove bottom. That is, the groove extending in the front-rear direction of the cushion pad acts on the pressure-sensitive switch not only for sensor placement but also for pressure aggregation. Therefore, even if the seating site changes in the front-rear direction, the seating can be detected with high sensitivity.

  In addition, the pressure distributed in the left-right direction of the seat portion 3B spreads to the vicinity of the left and right ends on the lower side of the seat portion 3B regardless of whether or not a groove is formed. For this reason, the groove | channel extended along the left-right direction of the seat part 3B does not act on the pressure sensitive switch SW1 for press aggregation. This is also confirmed by the experiment of the present inventors.

  Moreover, in the said embodiment, although one recessed part (shallow recessed part 61) was formed in the lower surface of the seat part 3B, the 2 or more independent groove | channel which becomes a non-connecting state may be formed.

  Moreover, in the said embodiment, although the seat pan 4 was applied as a mounting member of the cushion pad 3, it replaces with the said seat pan 4, and the spring pasted around the frame frame may be applied. Even such a mounting member has the same effect as the above-described embodiment.

  Moreover, in the said embodiment, although the seating sensor 2 was fixed to the lower surface of the seat part 3B with adhesive agent AD, you may fix by another method. For example, a plurality of pins or the like penetrating the pressure sensitive switches SW1 to SW4 and piercing the seat portion 3B can be applied. Note that the seating sensor 2 may be fixed to the lower surface of the seat portion 3B with an adhesive AD between the lower surface of the seat portion 3B and the upper surface of the seating sensor 2 via a member such as a spacer.

  Moreover, in the said embodiment, although the number of the pressure sensitive switches in the seating sensor 2 was four, three or less may be sufficient and five or more may be sufficient. When the number of pressure sensitive switches is two or more, it is not essential to arrange them in a straight line as in the above embodiment.

  In the above embodiment, four pressure-sensitive switches SW1 to SW4 are arranged in one independent groove that is in a disconnected state. However, one or two or more pressure-sensitive switches are provided in each groove. It may be arranged. A different number of pressure sensitive switches may be arranged for each groove.

  Moreover, in the said embodiment, although the magnitude | size of opening 31A-31D was made the same, you may be set as the opening which has a 2 or more types of magnitude | size. In this case, the insulating sheet of the pressure sensitive switch having a large opening is more flexible than the insulating sheet of the pressure sensitive switch having a small opening, and the sensitivity of the pressure sensitive switch having the large opening is a pressure sensitive having a small opening. Improved compared to the switch. Therefore, for example, when there is a pressure sensitive switch arranged in the space on the front side and the space on the rear side of the groove with respect to the center in the front-rear direction of the groove, the size of the opening in the pressure sensitive switch is made different. Thus, variations in sensitivity in these pressure sensitive switches can be suppressed.

  Moreover, in the said embodiment, although the cushion member 40 which covers the opening 31A-31D in the spacer 30 collectively through the 2nd insulating sheet 21 was applied, the cushion member which covers each separately for each opening 31A-31D is applied. Also good. For example, as shown in FIG. 12, a cushion member 70 covering a part of each of the openings 31A to 31D may be applied. Or although not shown in figure, the cushion member which covers a part of opening 31A and covers the whole other opening 31B-31D may be applied. In short, any cushion member may be used as long as it covers at least part of the opening via the insulating sheet. In addition, as described above, when an opening having two or more types of sizes is applied, the ratio of the cushion member covering the opening (the closing amount of the cushion member with respect to the opening) is different for each different type of opening. The sensitivity of each of the pressure sensitive switches SW1 to SW4 can be adjusted. Therefore, even if there is a difference in the pressing force applied to the pressure sensitive switches SW1 to SW4, the uniformity (balance) at which these pressure sensitive switches SW1 to SW4 are turned on can be improved.

  Moreover, in the said embodiment, the shape of the 1st electrode sheet 10, the 2nd electrode sheet 20, the spacer 30, the cushion member 40, and the reinforcement member 50 is not limited to the said embodiment, A various shape is applicable. it can. Further, the shapes of the first electrodes 12A to 12D, the second electrodes 22A to 22D, the openings 31A to 31D, the cushion pad 3, the groove (the shallow recess 61 or the deep recess 62), and the seat pan 4 are also limited to the above embodiment. Various shapes can be applied.

  In addition, the components of the seat device are combined, omitted, modified, or added with a well-known technique as appropriate without departing from the purpose of the present application, other than the contents shown in the first embodiment, the second embodiment, or other embodiments. And so on.

  The present invention is applicable to a seat of a vehicle such as a vehicle, and is particularly applicable to a seat to which a seat belt is to be worn.

DESCRIPTION OF SYMBOLS 1 ... Seat apparatus 2 ... Seating sensor 3 ... Cushion pad 3A ... Backrest part 3B ... Seat part 4 ... Seat pan 10 ... 1st electrode sheet 11 ... 1st Insulating sheets 12A to 12D ... first electrodes 13A, 13B ... terminals 14A to 14D ... wiring 20 ... second electrode sheets 21 ... second insulating sheets 22A to 22D ... second electrodes 24A to 24C ... second wiring 30 ... spacer 31A to 31D ... opening 32A to 32D ... slit 40, 70 ... cushion member 50 ... reinforcing member 61 ... shallow recess 62. ..Deep recess 71, 81 ... Metal plate SW1-SW4 ... Pressure sensitive switch

Claims (8)

A cushion pad in which a part is placed on the placement member and the other part is not placed on the placement member and the space is below;
A seating sensor disposed on at least a part of the other part of the cushion pad,
The seating sensor is
A first electrode sheet in which a part of the surface is a first electrode;
A part of the surface facing the first electrode is a second electrode, and the second electrode sheet is located on the seating surface side of the cushion pad from the first electrode sheet;
An opening is formed between the first electrode and the second electrode, and a sheet-like spacer interposed between the first electrode sheet and the second electrode sheet,
The rigidity of the first electrode sheet is larger than the rigidity of the second electrode sheet,
In the second electrode seat, a region of the surface facing the lower surface of the cushion pad other than the region corresponding to the upper side of the second electrode is fixed to the lower surface of the cushion pad. The seat device according to claim 1, wherein a gap is formed between a region of the second electrode seat above the second electrode and a lower surface of the cushion pad. A recess is formed on the lower surface of the cushion pad,
The seat device according to claim 2, wherein a gap is formed between a region of the second electrode sheet above the second electrode and a bottom of the recess. The recess comprises a first recess formed on the lower surface of the cushion pad and a second recess formed on a part of the bottom of the first recess,
The gap is formed between the region and the bottom of the second recess,
In the second electrode sheet, at least a part of the region other than the region that is above the second electrode is fixed to the bottom of the first recess,
The seat device according to claim 3, wherein the pressure sensitive switch is accommodated in a space of the first recess. The first electrode sheet includes a reinforcing member, and the rigidity of the first electrode sheet is greater than the rigidity of the second electrode sheet by the reinforcing member. The seat apparatus of Claim 1. The thickness of the first electrode sheet is larger than the thickness of the second electrode sheet, and the rigidity of the first electrode sheet is greater than the rigidity of the second electrode sheet. The seat apparatus of any one of 1-3. The first electrode sheet is a material harder than the material of the second electrode sheet, and the rigidity of the first electrode sheet is greater than the rigidity of the second electrode sheet. The seat apparatus of any one of 1-3. The said 1st electrode sheet | seat consists of metal plates, The surface site | part of the said metal plate facing the said 2nd electrode through the said opening serves as the said 1st electrode, The any one of Claims 1-7 characterized by the above-mentioned. The seat apparatus as described in.

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