JP2005233845A - Film sensor and wiring structure of sensor cell - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact-size film sensor having high accuracy of occupant detection. <P>SOLUTION: The film sensor 1 comprises a film member 3 and lead wires, which are wired to it and electrically connect a connector 94 to sensor cells 2a to 2d, wherein the film member 3 is interposed between a skin 90 of a seat 9 and a cushion pad 91 and comprises the sensor cells 2a to 2d which detect the load conditions of the seat 9, branch line sections 30L, 30R, 31L, 31R, on which the sensor cells 2a to 2d are placed, a trunk line section 32 having a sensor-side end 320 on which the branch line sections 30L, 30R, 31L, 31R converge and a connector-side end fixed to the connector 94, arranged below the cushion pad 91. The sensor-side end 320 is placed on a virtual substantially linear band, connecting the external shape of a pair of sensor cells 2a and 2c which are placed closest to the sensor-side end 320. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a film sensor for detecting a load state of a vehicle seat and a wiring structure of a sensor cell.

  The film sensor is disposed on a vehicle seat (see, for example, Patent Document 1). FIG. 12 shows a layout of a conventional film sensor. (A) is a top view, (b) is II-II sectional drawing of (a). In (a), the epidermis is omitted. FIG. 13 shows an enlarged view in a circle B in FIG.

  As shown in these drawings, the seat 100 includes an outer skin 101 and a cushion pad 102. On the upper surface of the cushion pad 102, suspension grooves 103a and 103b extending in the vehicle front-rear direction and suspension grooves 103c extending in the vehicle width direction are arranged in an H shape. Further, a communication hole 104 is formed on the side of the seat back 105 (indicated by a one-dot chain line in FIG. 12) of the cushion pad 102.

  The film sensor 106 includes sensor cells 107a, 107b, 107c, and 107d, a film member 111, and a conductor (not shown). The film member 111 includes branch lines 108 </ b> L and 108 </ b> R and a main line 109. The trunk portion 109 is inserted through the communication hole 104. The sensor cells 107 a, 107 b, 107 c, 107 d and the connector 110 are electrically connected by a conducting wire arranged on the film member 111.

Each of the sensor cells 107a, 107b, 107c, and 107d has a membrane switch shape. When an occupant sits on the seat 100, all or one of the sensor cells 107a, 107b, 107c, 107d is energized. The energization signal is transmitted to the electronic control unit (not shown) and the seat belt buckle switch (not shown) via the conductor and the connector 110. If the seat belt (not shown) is not worn and the signal from the seat belt buckle switch is not detected despite the energization signal being input, a warning is given to prompt the user to wear it.
JP 2002-22577 A

  By the way, the suspending grooves 103a, 103b, and 103c are arranged to pull the skin 101 from below. A portion corresponding to the suspension groove 103 in the skin 101 is narrowed downward. For this reason, the trench part 114 excellent in design is formed on the surface of the skin 101.

  In recent years, in order to form two rows of trench portions in the skin, a seat has been developed in which a suspension groove extending in two rows in the vehicle width direction is provided in the cushion pad. FIG. 14 shows an arrangement diagram when a conventional film sensor is arranged on this sheet. In addition, about the site | part corresponding to FIG. 12, it shows with the same code | symbol. As shown in the figure, the branch line portions 108L and 108R intersect with the vehicle width direction suspension groove 103d. For this reason, it is difficult to form a trench in the skin at the intersection.

  In view of this point, the inventor has devised a sheet in which the communication hole 104 is disposed on the groove bottom of the suspension groove 103d. FIG. 15 is a layout diagram in the case where a conventional film sensor is disposed on a sheet devised by the present inventor. In addition, about the site | part corresponding to FIG. 12, it shows with the same code | symbol. In this case, as shown in the figure, the vicinity of the sensor cell 107a arrangement portion in the branch line portion 108L and the vicinity of the sensor cell 107c arrangement portion in the branch line portion 108R fall into the communication hole 104. Resulting in. Therefore, the occupant detection accuracy may be reduced. Moreover, it is necessary to let both the branch line parts 108L and 108R pass through the communication hole 104. Therefore, the opening area of the communication hole 104 is increased.

  The wiring structure of the film sensor and sensor cell of the present invention has been completed in view of the above problems. Accordingly, an object of the present invention is to provide a wiring structure of a film sensor and a sensor cell that can be arranged in a narrow space such as between the two rows of suspension grooves and can secure a desired occupant detection accuracy. To do.

  (1) In order to solve the above problems, a film sensor of the present invention is interposed between the epidermis surface of a seat and the upper surface of a cushion pad, and a plurality of sensor cells that electrically detect the load state of the seat, A long trunk line having a plurality of branch lines where the sensor cells are disposed, a sensor side end where the plurality of branch lines converge, and a connector side end fixed to a connector disposed below the cushion pad A film member comprising: a film member having a portion; and a conductive wire that is wired to the film member and electrically connects the connector and the sensor cell, wherein the sensor side end includes a plurality of the sensor side ends. Among the sensor cells, the sensor cells are arranged on a virtual substantially straight band that connects a pair of outer shapes of the sensor cells arranged closest to the sensor side end.

  According to the film sensor of the present invention, a plurality of branch lines each having a sensor cell are bundled by a main line. And this trunk line part is bent and extended over the cushion pad upper and lower sides. For this reason, there is little possibility that the sensor cell will be affected by the bending of the trunk line. Therefore, there is little possibility that the occupant detection accuracy is lowered.

  Further, the main line portion extends from a virtual substantially straight band connecting a pair of sensor cells arranged closest to the sensor side end. For this reason, the branch line part of the film sensor of this invention has short length in the trunk line part longitudinal direction. Therefore, it can be relatively easily arranged in a narrow space between the pair of suspension grooves 103c and 103d in FIG. That is, the film sensor of the present invention is excellent in space saving while securing a detection area equivalent to the detection areas by the conventional sensor cells 107a, 107b, 107c, and 107d. Moreover, when the film sensor of the present invention is used due to excellent space saving, the degree of freedom in arranging the hanging grooves is increased. Therefore, the degree of freedom in sheet design is increased.

  The “load state” in the present invention refers to at least one of the presence / absence of the load on the seat and the degree of the load. In the present invention, “on a virtual substantially straight belt” refers to a belt formed by being surrounded by two straight lines that connect a pair of sensor cell outer shapes (outer edges of sensor cell arrangement portions in the branch line portion). In addition, a case where the virtual substantially straight band and the sensor side end partially overlap is also included in the state of “arranged on the virtual substantially straight band” in the present invention.

  (2) Preferably, the cushion pad is provided with a suspension groove for narrowing the epidermis, and a communication hole that communicates the groove bottom of the suspension groove and the lower surface of the cushion pad. It is better to have a configuration inserted through the communication hole.

  In this configuration, only the trunk portion passes through the communication hole. Therefore, as shown in FIG. 15, the branch line portions 108L and 108R also require a smaller opening area of the communication hole than when passing through the communication hole 104. That is, it is not necessary to make a large hole in the cushion pad.

  (3) Preferably, an adhesive layer for adhering the film member to the cushion pad and a separator for protecting the adhesive layer before application are laminated on the side of the cushion pad of the film member. It is better to adopt a configuration in which the included angle between the main line portion and the branch line portion that is arranged in a row and is directly connected to the sensor side end among the plurality of branch line portions is set to 90 ° or more.

  The film sensor of this structure is affixed on a cushion pad by an adhesive layer. The adhesive layer is covered with a separator. The separator is peeled off from the adhesive layer before application. The separator is gradually peeled off from the connector side of the film sensor along the longitudinal direction of the trunk portion.

  When the separator peeling operation reaches the branch line portion beyond the main line portion, the separator is peeled off from the adhesive layer while branching in a plurality of directions. At this time, the peeling force is distributed and transmitted from the main line portion corresponding portion to each branch line portion corresponding portion in the separator. However, the direction in which the peeling force is applied is only one direction (the direction from the connector side end of the trunk portion toward the sensor side end). Therefore, when the included angle between the branch line part and the main line part is less than 90 °, the peeling force causes a force opposite to the peeling direction to act on the part corresponding to the branch line part of the separator. For this reason, unless the direction in which the peeling force is applied is changed according to the extending direction of the branch line portion, the portion corresponding to the branch line portion of the separator may be damaged by the peeling force.

  In this regard, the included angle between the branch line portion directly connected to the sensor side end of the present configuration and the trunk portion is set to 90 ° or more. Therefore, there is little possibility that the portion corresponding to the branch line portion of the separator is damaged by the peeling force. For this reason, a separator can be peeled off comparatively easily.

  (4) Preferably, in the configuration of the above (3), it is preferable that all the branch lines extend in a substantially radial shape with the sensor side end as the center. According to this configuration, the portion corresponding to the branch line portion of the separator is not easily damaged. Moreover, it becomes easy to peel off the separator.

  (5) Moreover, in order to solve the said subject, the film sensor of this invention is interposed between the epidermis surface of a sheet | seat, and the cushion pad upper surface, The several sensor cell which detects the load state of this sheet | seat electrically A long shape having a plurality of branch line portions in which the plurality of sensor cells are arranged, a sensor side end where the plurality of branch line portions converge, and a connector side end fixed to a connector disposed below the cushion pad A film sensor comprising: a film member having a main line portion; and a conductive wire that is wired to the film member and electrically connects the connector and the sensor cell, wherein the plurality of sensor cells are membranes. It has a switch shape, and when at least two of the sensor cells are turned on at the same time, it conducts and detects the load state of the seat electrically. The features.

  If a single sensor cell is turned on and conducts, for example, when the sensor cell is pressed by a corner portion of an angular load, the film sensor may malfunction. In this regard, the film sensor of the present invention does not conduct unless at least two sensor cells are simultaneously turned on. Therefore, the film sensor of the present invention has high occupant detection accuracy.

  (6) Preferably, in the configuration of (5), the sensor side end is a virtual substantially straight line connecting a pair of sensor cell outer shapes arranged closest to the sensor side end among the plurality of sensor cells. It is better to have a configuration arranged on the belt.

  According to this configuration, as described in (1) above, the main line part bundles a plurality of branch line parts each having a sensor cell. And this trunk line part is bent and extended over the cushion pad upper and lower sides. For this reason, there is little possibility that the sensor cell will be affected by the bending of the trunk line. Therefore, there is little possibility that the occupant detection accuracy is lowered.

  Further, the main line portion extends from a virtual substantially straight band that connects a pair of sensor cell outer shapes arranged closest to the sensor side end. For this reason, the branch line part of the film sensor of this invention has short length in the trunk line part longitudinal direction. Therefore, it can be arranged relatively easily in a narrow space. That is, the film sensor of the present invention is excellent in space saving while securing a detection area equivalent to the detection area by the conventional sensor cell. Moreover, when the film sensor of the present invention is used due to excellent space saving, the degree of freedom in arranging the hanging grooves is increased. Therefore, the degree of freedom in sheet design is increased.

  (7) Preferably, in the configuration of the above (5), the cushion pad includes a suspension groove for narrowing the skin, and a communication hole that communicates the groove bottom of the suspension groove and the lower surface of the cushion pad. It is preferable that the main line portion is arranged and inserted into the communication hole. As described in (2) above, according to this configuration, only the trunk portion passes through the communication hole. Therefore, the opening area of the communication hole can be small. That is, it is not necessary to make a large hole in the cushion pad.

  (8) Preferably, in the configuration of (5), on the side of the cushion pad of the film member, an adhesive layer for attaching the film member to the cushion pad, and the adhesive layer before being attached And a separator between the main line portion and the branch line portion directly connected to the sensor side end among the plurality of branch line portions and the main line portion is set to 90 ° or more. Is better.

  As described in (3) above, the film sensor of this configuration is attached to the cushion pad by the adhesive layer. The adhesive layer is covered with a separator. The separator is peeled off from the adhesive layer before application. The separator is gradually peeled off from the connector side of the film sensor along the longitudinal direction of the trunk portion.

  When the separator peeling operation reaches the branch line portion beyond the main line portion, the separator is peeled off from the adhesive layer while branching in a plurality of directions. At this time, the peeling force is distributed and transmitted from the main line portion corresponding portion to each branch line portion corresponding portion in the separator. However, the direction in which the peeling force is applied is only one direction (the direction from the connector side end of the trunk portion toward the sensor side end). Therefore, when the included angle between the branch line part and the main line part is less than 90 °, the peeling force causes a force opposite to the peeling direction to act on the part corresponding to the branch line part of the separator. For this reason, unless the direction in which the peeling force is applied is changed according to the extending direction of the branch line portion, the portion corresponding to the branch line portion of the separator may be damaged by the peeling force.

  In this regard, the included angle between the branch line portion directly connected to the sensor side end of the present configuration and the trunk portion is set to 90 ° or more. Therefore, there is little possibility that the portion corresponding to the branch line portion of the separator is damaged by the peeling force. For this reason, a separator can be peeled off comparatively easily.

  (9) Preferably, in the configuration of the above (8), it is preferable that all the branch line portions extend in a substantially radial shape centering on the sensor side end. According to this configuration, as described in (4) above, the portion corresponding to the branch line portion of the separator is not easily damaged. Moreover, it becomes easy to peel off the separator.

  (10) Preferably, in the configuration of the above (5), the plurality of sensor cells constitutes a plurality of cell rows extending in the vehicle width direction and arranged in the vehicle front-rear direction in the seat, When a plurality of the sensor cells constituting any one of the cell rows are turned on at the same time, it is preferable that the sensor cells are electrically connected and the load state of the seat is electrically detected.

  That is, in this configuration, a plurality of sensor cells constituting the cell row are electrically connected in series. The cell row extends in the vehicle width direction. The cell rows are arranged in the vehicle front-rear direction. For this reason, the occupant state of the seat can be reliably detected regardless of the physique of the occupant. In particular, when a child leans on the seat back and sits on the seat, the sensor cells constituting the cell row arranged behind the vehicle in the seat are likely to be turned on.

  (11) Preferably, in the configuration of the above (10), the plurality of sensor cells constituting the plurality of cell rows includes a positive electrode sensor cell close to a positive electrode and a negative electrode sensor cell close to a negative electrode, and the positive electrode side The sensor cell and the negative electrode side sensor cell are arranged symmetrically with respect to the trunk portion of the film member, and the conductive wire is connected to the positive electrode side sensor cells and the positive electrode side terminal of the connector on one surface side of the film member, It is preferable that the negative electrode side sensor cells and the negative electrode side terminal of the connector are connected to each other, and the positive electrode side sensor cell and the negative electrode side sensor cell are connected to each other on the other surface side of the film member. According to this configuration, the cell row arrangement (10) can be achieved relatively easily.

  (12) In order to solve the above-described problem, the film sensor of the present invention is interposed between the epidermis surface of the seat and the upper surface of the cushion pad, and has a plurality of sensor cells that electrically detect the load state of the seat. A long shape having a plurality of branch line portions in which the plurality of sensor cells are arranged, a sensor side end where the plurality of branch line portions converge, and a connector side end fixed to a connector disposed below the cushion pad A film member comprising: a film member having a main wire portion; and a conductive wire that is wired to the film member and electrically connects the connector and the sensor cell. A suspension groove for narrowing down the epidermis, a communication hole that communicates the groove bottom of the suspension groove and the lower surface of the cushion pad are arranged, and the main line portion is inserted through the communication hole. To.

  That is, the film sensor of the present invention is characterized only in that the main line portion is inserted through the communication hole of the hanging groove. According to the film sensor of the present invention, it is not necessary to make the communication hole 104 on the seat back 105 side of the cushion pad 102 as shown in FIG. Therefore, the degree of freedom of arrangement of the sensor cell is increased. Moreover, if the trunk line portion is passed through the communication hole of the suspension groove, the length of the trunk line portion can be easily shortened.

  (13) In order to solve the above-described problem, the wiring structure of the sensor cell of the present invention is a wiring structure of a plurality of membrane-switch-shaped sensor cells, and at least two of the plurality of sensor cells are simultaneously turned on. In this case, the positive electrode and the negative electrode are short-circuited.

  As described in (5) above, if a single sensor cell is turned on, it is possible that the film sensor malfunctions when the sensor cell is pressed by, for example, a corner of an angular load. . In this regard, the wiring structure of the present invention does not conduct unless at least two sensor cells are simultaneously turned on. Therefore, the wiring structure of the present invention has high operational reliability.

  (14) Preferably, in the configuration of (13) above, the plurality of sensor cells constitutes a plurality of cell rows, and the plurality of sensor cells constituting any one cell row of the plurality of cell rows include: When turned on at the same time, the positive electrode and the negative electrode are preferably short-circuited.

  That is, in this configuration, a plurality of sensor cells constituting the cell row are electrically connected in series. According to this configuration, the positive electrode and the negative electrode are not short-circuited unless a plurality of sensor cells connected in series are simultaneously turned on. Therefore, the wiring structure of this configuration has higher operation reliability.

  ADVANTAGE OF THE INVENTION According to this invention, the wiring structure of the film sensor and sensor cell which can be arrange | positioned also in a narrow space and can ensure desired passenger | crew detection accuracy can be provided.

  Hereinafter, embodiments of the film sensor of the present invention will be described. The description of the second embodiment also serves as an explanation of the wiring structure of the sensor cell of the present invention.

<First embodiment>
First, the structure of the film sensor of this embodiment is demonstrated. FIG. 1 is a perspective arrangement view of the film sensor of the present embodiment. The sheet is shown in a transparent manner. FIG. 2 shows a layout of the film sensor. (A) is a top view, (b) is II sectional drawing of (a). In (a), the epidermis is omitted. Moreover, a seat back is shown with a dashed-dotted line. FIG. 3 shows an enlarged view in a circle A in FIG.

  As shown in these drawings, the seat 9 includes an outer skin 90 and a cushion pad 91. The skin 90 covers the range from the upper surface of the cushion pad 91 to the lower surface edge through the side surface. On the upper surface of the cushion pad 91, suspension grooves 92a and 92b extending in the vehicle front-rear direction are arranged in the vehicle width direction. Between the two rows of suspension grooves 92a and 92b, suspension grooves 92c and 92d extending in the vehicle width direction are arranged in the vehicle front-rear direction. The suspension groove 92c is arranged at the approximate center of the seat 9 in the vehicle front-rear direction. The hanging grooves 92d are arranged near the hip point of the seat 9. A communication hole 93 is formed in the substantially center of the suspension groove 92d in the vehicle width direction. The communication hole 93 penetrates from the groove bottom of the suspension groove 92d to the lower surface of the sheet 9.

  A groove-side wire 920c is disposed in the hanging groove 92c. On the other hand, a skin-side wire 901c is disposed on the skin 90 so as to face the groove-side wire 920c in the vertical direction. The skin side wire 901c is locked to the groove side wire 920c by a hog ring 95c. For this reason, the skin side wire 901c is drawn in the direction of the groove side wire 920c. Therefore, a trench portion 900 c is formed at a position facing the suspension groove 92 c in the skin 90. With the same configuration as described above, trench portions 900a, 900b, and 900d are formed at positions facing the suspension grooves 92a, 92b, and 92d in the skin 90, respectively.

  The film sensor 1 includes sensor cells 2a, 2b, 2c, and 2d, a film member 3, and a conducting wire (not shown). The sensor cells 2a, 2b, 2c, and 2d are interposed between the lower surface of the skin 90 of the seat 9 and the upper surface of the cushion pad 91. The sensor cells 2a, 2b, 2c, and 2d are distributed at predetermined positions. The sensor cells 2a, 2b, 2c, and 2d will be described later.

  The film member 3 is a thin resin film. The film member 3 includes branch lines 30L, 31L, 30R, 31R, and a trunk line 32. A sensor cell 2a is formed at the branch end of the branch line portion 30L. The branch line portion 31L is branched and extended from the middle of the branch line portion 30L. A sensor cell 2b is formed at the branch end of the branch line portion 31L. A sensor cell 2c is formed at the branch end of the branch line portion 30R. The branch line portion 31R is branched and extended from the middle of the branch line portion 30R. A sensor cell 2d is formed at the branch end of the branch line portion 31R.

  The main line portion 32 has a long shape. The sensor side end 320 of the main line portion 32 is connected to the root ends of the branch line portions 30L and 30R. On the other hand, the connector side end 321 of the main line portion 32 is connected to a connector 94 fixed to a cushion frame (not shown) below the seat 9. An intermediate portion of the trunk portion 32 is inserted into the communication hole 93. That is, the main line portion 32 connects the branch line portions 30L and 30R on the upper surface of the cushion pad 91 and the connector 94 below the seat 9 through the communication hole 93.

  An adhesive layer (not shown) is disposed on the surface of the film member 3 on the cushion pad 91 side. The film member 3 is stuck to the cushion pad 91 by the sticking layer. Moreover, before sticking, the sticking layer is covered with a separator (not shown). These adhesive layer and separator will be described later.

  Next, the configuration of the sensor cell of the film sensor of this embodiment will be described in detail. FIG. 4 shows a vertical sectional view of the sensor cell. (A) shows an insulated state, (b) shows an energized state, respectively. As shown in the figure, the sensor cell 2c is formed between the upper layer 300R and the lower layer 301R of the branch line portion 30R. The conducting wire 40 is formed by laminating a silver layer 302R on the lower surface of the upper layer 300R, and the silver layer 302R is covered with a carbon layer 303R. Opposing in the vertical direction, the conductive wire 41 is formed by laminating a silver layer 304R on the upper surface of the lower layer 301R, and the silver layer 304R is covered with a carbon layer 305R. When the occupant sits on the seat, the upper layer 300R bends as shown by the white arrow in FIG. 5B, and the cushion pad 91 also bends as the occupant sits, and the lower layer 301R also bends by the reaction force, and the upper carbon layer 303R. And the lower carbon layer 305R are in contact with each other. The configuration of the sensor cells 2a, 2b, and 2d is the same. Therefore, the explanation is omitted.

  Next, the wiring structure of the film sensor of this embodiment will be described. FIG. 5A shows a top view of the film sensor of the present embodiment, FIG. 5B shows a bottom view of the film sensor, and FIG. 5C shows a wiring diagram of the film sensor. On the positive electrode side, the sensor cells 2 a, 2 b, 2 c, 2 d and the connector (not shown) are connected by a conductive wire 40. Similarly, on the negative electrode side, each sensor cell 2a, 2b, 2c, 2d and the connector are connected by a conducting wire 41. The sensor cells 2a, 2b, 2c, and 2d are connected in parallel. For this reason, when at least one of the sensor cells 2a, 2b, 2c, and 2d is closed (see FIG. 4), the connector, the conductor 40, the sensor cell, the conductor 41, and the connector are energized again in this order. The energization signal is transmitted to an electronic control unit (not shown) and a seat belt buckle switch (not shown). If the seat belt (not shown) is not worn and the signal from the seat belt buckle switch is not detected despite the energization signal being input, a warning is given to prompt the user to wear it.

  Next, a method for attaching the film sensor of the present embodiment will be described. FIG. 6 is a schematic perspective view showing a state in which the separator is peeled from the film member in the film sensor of the present embodiment. As described above, the adhesive layer is disposed on the lower surface of the film member 3. Before sticking, the sticking layer is covered with a paper separator 5. As shown by the white arrow in the figure, the separator 5 starts from the connector side end 321 side in the middle of the main line part 32, and extends along the longitudinal direction of the main line part 32 to the sensor side end 320, and the branch line part 30L, It peels from the film member 3 to 31L, 30R, and 31R. When the separator 5 is peeled off, the adhesive layer is exposed. With this adhesive layer, the film sensor 1 is attached to the cushion pad.

  Next, the effect of the film sensor of this embodiment is demonstrated. According to the film sensor 1 of the present embodiment, only the trunk portion 32 is bent and extended over the cushion pad 91. Further, the sensor side end 320 of the trunk line portion 32 (the branch line portions 30L and 30R connecting portions in the trunk line portion 32, shown by solid line hatching in FIG. 6) is a pair of sensor cells 2a and 2c outer shapes (as shown in FIG. 6) It is partially overlapped with the central part of the virtual straight line L1 (indicated by the alternate long and short dash line in FIG. 6) connecting the sensor cells 2a and 2c in the parts 30L and 30R. For this reason, there is little possibility that the sensor cells 2a and 2c will be affected by the bending of the trunk portion 32. Therefore, there is little possibility that the occupant detection accuracy is lowered.

  Moreover, since the trunk line part 32 is arranged at the above position, the length L2 (see FIG. 6) of the branch line parts 30L, 31L, 30R, 31R in the longitudinal direction of the trunk line part 32 is short. Therefore, it can be relatively easily arranged in a narrow space between the pair of suspension grooves 103c and 103d in FIG. That is, the film sensor 1 of the present embodiment is excellent in space saving while securing a detection area equivalent to the detection area by the conventional sensor cell.

  Moreover, when the film sensor 1 of the present embodiment is used due to excellent space saving, the degree of freedom of arrangement of the hanging grooves 92c and 92d is increased. Accordingly, the degree of freedom in designing the seat 9 is increased.

  Further, according to the film sensor 1 of the present embodiment, only the trunk portion 32 passes through the communication hole 93. Therefore, as shown in FIG. 15, the branch lines 108L and 108R also require a smaller opening area of the communication hole 93 than when passing through the communication hole.

  Further, according to the film sensor 1 of the present embodiment, the included angle α between the branch line portion 30L and the main line portion 32 is set to 90 ° or more. Similarly, the included angle β between the branch line portion 30R and the main line portion 32 is also set to 90 ° or more (see FIG. 6). In addition, the branch line portions 30L, 31L, 30R, and 31R are radially arranged with the sensor side end 320 of the main line portion 32 as a focusing point. Therefore, the branch line portions 30L, 31L, 30R, and 31R corresponding portions in the separator 5 are less likely to be cut by the peeling force. For this reason, the separator 5 can be peeled at a stretch.

  In other words, it is not necessary to dare to use an expensive resin separator such as a polyester resin film to prevent damage to the separator 5 (of course, it can be used). For this reason, the manufacturing cost of the separator 5 and by extension, the film sensor 1 can be reduced.

<Second embodiment>
The difference between this embodiment and the first embodiment is only the wiring structure. Therefore, the difference will be described here. FIG. 7A shows a top view of the film sensor of the present embodiment, FIG. 7B shows a bottom view of the film sensor, and FIG. 7C shows a wiring diagram of the film sensor. In addition, about the site | part corresponding to FIG. 5, it shows with the same code | symbol. As shown in the figure, on the positive electrode side, the sensor cells 2a and 2b and the positive electrode side terminal of the connector (not shown) are connected by a conducting wire 40. Similarly, on the negative electrode side, the sensor cells 2c and 2d and the negative electrode side terminal of the connector are connected by a conducting wire 41. The sensor cell 2a and the sensor cell 2c are connected in series. The sensor cell 2b and the sensor cell 2d are connected in series. These two sensor cell pairs are connected in parallel. When at least one of the first sensor cell pair (sensor cell 2a and sensor cell 2c) or the second sensor cell pair (sensor cell 2b and sensor cell 2d) is closed, the connector, the conductor 40, the sensor cell pair, the conductor 41, and the connector again in this order Energize.

  The sensor cell 2a and the sensor cell 2c are arranged in series in the vehicle width direction. Similarly, the sensor cell 2b and the sensor cell 2d are arranged in series in the vehicle width direction. These two columns correspond to the cell columns of the present invention. The sensor cells 2a and 2b are included in the positive electrode side sensor cell of the present invention. In addition, the sensor cells 2c and 2d are included in the negative electrode side sensor cell of the present invention.

  The film sensor 1 of this embodiment has the same effect as the film sensor of the first embodiment. Moreover, according to the film sensor 1 of this embodiment, the load on the sheet is not detected unless two sensor cells (for example, the sensor cell 2a and the sensor cell 2c) constituting at least one pair of sensors are energized together. For this reason, there are few false detections.

<Third embodiment>
The difference between the present embodiment and the first embodiment is only the arrangement of the branch line portions. Therefore, only the differences will be described here. In FIG. 8, the top view of the film sensor of this embodiment is shown. In addition, about the site | part corresponding to FIG. 5, it shows with the same code | symbol. In addition, the conductive wire is omitted.

  As shown in the figure, the branch line portion 31L connects the sensor cell 2a and the sensor cell 2b. Similarly, the branch line portion 31R connects the sensor cell 2c and the sensor cell 2d. The film sensor 1 of this embodiment has the same effect as the film sensor of the first embodiment.

<Fourth embodiment>
The difference between the present embodiment and the first embodiment is only the arrangement of the branch line portions. Therefore, only the differences will be described here. FIG. 9 shows a top view of the film sensor of the present embodiment. In addition, about the site | part corresponding to FIG. 5, it shows with the same code | symbol. In addition, the conductive wire is omitted.

  As shown in the figure, the branch line portion 31L connects the sensor cell 2a and the sensor cell 2b. Similarly, the branch line portion 31R connects the sensor cell 2c and the sensor cell 2d. Further, the branch line portion 30L, the sensor side end 320, and the branch line portion 30R are aligned in a straight line. That is, the included angle α between the branch line portion 30L and the main line portion 32 and the included angle β between the branch line portion 30R and the main line portion 32 are both set to 90 °. The film sensor 1 of this embodiment has the same effect as the film sensor of the first embodiment.

<Fifth embodiment>
The difference between the present embodiment and the first embodiment is only the arrangement of the branch line portions. Therefore, only the differences will be described here. In FIG. 10, the top view of the film sensor of this embodiment is shown. In addition, about the site | part corresponding to FIG. 5, it shows with the same code | symbol. In addition, the conductive wire is omitted.

  As shown in the figure, the branch line portion 31L connects the sensor cell 2a and the sensor cell 2b. Similarly, the branch line portion 31R connects the sensor cell 2c and the sensor cell 2d. Further, the branch line portion 30L connects the sensor side end 320 and the sensor cell 2a in an arc shape. Similarly, the branch line portion 30R connects the sensor side end 320 and the sensor cell 2c in an arc shape.

  When the branch line portions 30L and 30R have an arc shape as in the present embodiment, the included angle α between the branch line portion 30L and the main line portion 32 is a straight line connecting the sensor side end 320 and the connector side end 321 and the sensor The angle between the side end 320 and the straight line connecting the point that enters the sensor cell 2b, 2d most in the branch line portion 30L.

  Similarly, the included angle β between the branch line portion 30R and the main line portion 32 enters the sensor cell 2b, 2d side most at the sensor side end 320 and the branch line portion 30R at the straight line connecting the sensor side end 320 and the connector side end 321. This is the angle between the straight line connecting the two points. The film sensor 1 of this embodiment has the same effect as the film sensor of the first embodiment.

<Sixth embodiment>
The difference between the present embodiment and the first embodiment is that the film sensor itself is disposed by being rotated 90 ° counterclockwise as viewed from above the sheet. Therefore, only the differences will be described here. In FIG. 11, the layout (top view) of the film sensor of this embodiment is shown. In addition, about the site | part corresponding to FIG. 2, it shows with the same code | symbol.

  As shown in the figure, the communication hole 93 is formed in a suspension groove 92b extending in the vehicle front-rear direction. And sensor cell 2a, 2b, 2c, 2d and the connector are connected by the trunk | line part 32 penetrated by this suspension groove 92b. The film sensor 1 of this embodiment has the same effect as the film sensor of the first embodiment. Further, according to the film sensor 1 of the present embodiment, the sensor cells 2a, 2b, 2c, and 2d can be easily arranged even when the distance between the pair of hanging grooves 92a and 92b extending in the vehicle longitudinal direction is narrow. it can.

<Others>
The embodiment of the film sensor of the present invention has been described above. However, the embodiment is not particularly limited to the above embodiment. Various modifications and improvements that can be made by those skilled in the art are also possible.

  For example, in the above-described embodiment, the membrane switch-like ON / OFF type sensor cells 2a, 2b, 2c, and 2d are arranged. However, for example, a load detection type sensor cell using pressure-sensitive ink or the like may be arranged. Moreover, in the said embodiment, although the total four sensor cells 2a, 2b, 2c, 2d were arrange | positioned, the arrangement number of sensor cells is not specifically limited, either. Moreover, the arrangement location and the number of arrangement of the hanging grooves 92a, 92b, 92c, 92d are not particularly limited. That is, you may employ | adopt the film sensor of this invention for the sheet | seat 100 of the conventional type as shown in above-mentioned FIG. Further, the material of the separator 5 is not particularly limited. For example, if a polyester resin separator is disposed, the separator can be peeled off more quickly. Moreover, the electrode of a conducting wire pattern is not specified in particular. That is, either of the conducting wires 40 and 41 may be a positive electrode or a negative electrode.

It is a perspective arrangement view of a film sensor of a first embodiment. It is an arrangement view of the film sensor. FIG. 3 is an enlarged view in a circle A in FIG. 2. It is an up-down direction sectional view of the sensor cell of the film sensor. It is a figure which shows the conducting wire arrangement | positioning and wiring structure of the film sensor. It is a model perspective view of the state which has peeled the separator from the film member in the film sensor. It is a figure which shows the conducting wire arrangement | positioning and wiring structure of the film sensor of 2nd embodiment. It is a top view of the film sensor of a third embodiment. It is a top view of the film sensor of a fourth embodiment. It is a top view of the film sensor of a fifth embodiment. It is a layout view of the film sensor of the sixth embodiment. It is an arrangement view of a conventional film sensor. It is an enlarged view in the circle B of FIG. FIG. 10 is a layout view when a conventional film sensor is disposed on a sheet in which a pair of suspension grooves extending in the vehicle width direction are arranged at a narrow interval. FIG. 5 is a layout diagram when a conventional film sensor is disposed on a sheet devised by the present inventor.

Explanation of symbols

  1: Film sensor, 2a to 2d: Sensor cell, 3: Film member, 300R: Upper layer, 301R: Lower layer, 302R: Silver layer, 303R: Carbon layer, 304R: Silver layer, 305R: Carbon layer, 30L: Branch line portion, 30R : Branch line part, 31L: branch line part, 31R: branch line part, 32: trunk line part, 320: sensor side end, 321: connector side end, 40: conductor, 41: conductor, 5: separator, 9: sheet, 90: skin 900a to 900d: trench part, 901c: skin side wire, 91: cushion pad, 92a to 92d: hanging groove, 920c: groove side wire, 93: communication hole, 94: connector, 95c: hog ring.

Claims (14)

A plurality of sensor cells that are interposed between the epidermis surface of the seat and the upper surface of the cushion pad and electrically detect the load state of the seat;
A plurality of branch lines provided with a plurality of sensor cells, a sensor side end where the plurality of branch lines converge, and a connector side end fixed to a connector arranged below the cushion pad. A film member having a trunk portion;
A film sensor comprising: a conductor that is wired to the film member and electrically connects the connector and the sensor cell;
The film sensor, wherein the sensor side end is arranged on a virtual substantially straight band that connects a pair of sensor cell outer shapes arranged closest to the sensor side end among the plurality of sensor cells. . In the cushion pad, a suspension groove for narrowing down the skin, and a communication hole for communicating the bottom of the suspension groove and the lower surface of the cushion pad are arranged,
The film sensor according to claim 1, wherein the trunk portion is inserted through the communication hole. Further, on the side surface of the cushion pad of the film member, an adhesive layer for adhering the film member to the cushion pad and a separator for protecting the adhesive layer before application are laminated and disposed.
2. The film sensor according to claim 1, wherein an angle between a branch line portion directly connected to the sensor side end of the plurality of branch line portions and the trunk line portion is set to 90 ° or more.   The film sensor according to claim 3, wherein all the branch lines extend in a substantially radial shape with the sensor side end as a center. A plurality of sensor cells that are interposed between the epidermis surface of the seat and the upper surface of the cushion pad and electrically detect the load state of the seat;
A plurality of branch lines provided with a plurality of sensor cells, a sensor side end where the plurality of branch lines converge, and a connector side end fixed to a connector arranged below the cushion pad. A film member having a trunk portion;
A film sensor comprising: a conductor that is wired to the film member and electrically connects the connector and the sensor cell;
The plurality of sensor cells have a membrane switch shape,
A film sensor characterized in that when at least two of the plurality of sensor cells are turned on simultaneously, the film cell conducts and electrically detects the load state of the sheet.   The film according to claim 5, wherein the sensor side end is arranged on a virtual substantially straight band connecting a pair of sensor cell outer shapes arranged closest to the sensor side end among the plurality of sensor cells. Sensor. In the cushion pad, a suspension groove for narrowing down the skin, and a communication hole for communicating the bottom of the suspension groove and the lower surface of the cushion pad are arranged,
The film sensor according to claim 5, wherein the trunk portion is inserted through the communication hole. Further, on the side surface of the cushion pad of the film member, an adhesive layer for adhering the film member to the cushion pad and a separator for protecting the adhesive layer before application are laminated and disposed.
The film sensor according to claim 5, wherein an angle between a branch line portion directly connected to the sensor side end of the plurality of branch line portions and the trunk line portion is set to 90 ° or more.   The film sensor according to claim 8, wherein all the branch lines extend in a substantially radial shape with the sensor side end as a center. The plurality of sensor cells, in the seat, constitute a plurality of cell rows extending in the vehicle width direction and arranged in the vehicle front-rear direction,
The film sensor according to claim 5, wherein, when a plurality of the sensor cells constituting any one of the plurality of cell rows are simultaneously turned on, the film sensor conducts and electrically detects a load state of the sheet. The plurality of sensor cells constituting the plurality of cell rows are composed of a positive electrode side sensor cell close to the positive electrode and a negative electrode side sensor cell close to the negative electrode,
The positive electrode side sensor cell and the negative electrode side sensor cell are arranged symmetrically with respect to the trunk portion of the film member,
The conducting wire connects the positive electrode side sensor cells and the positive electrode side terminal of the connector on one surface side of the film member, and connects the negative electrode side sensor cells and the negative electrode side terminal of the connector to the positive electrode side on the other surface side of the film member. The film sensor of Claim 10 arrange | positioned so that a side sensor cell and this negative electrode side sensor cell may be tied. A plurality of sensor cells that are interposed between the epidermis surface of the seat and the upper surface of the cushion pad and electrically detect the load state of the seat;
A plurality of branch lines provided with a plurality of sensor cells, a sensor side end where the plurality of branch lines converge, and a connector side end fixed to a connector arranged below the cushion pad. A film member having a trunk portion;
A film sensor comprising: a conductor that is wired to the film member and electrically connects the connector and the sensor cell;
In the cushion pad, a suspension groove for narrowing down the skin, and a communication hole for communicating the bottom of the suspension groove and the lower surface of the cushion pad are arranged,
The main line part is inserted in the communication hole, The film sensor characterized by things. A wiring structure of a plurality of sensor cells in the form of membrane switches,
A wiring structure of a sensor cell in which a positive electrode and a negative electrode are short-circuited when at least two of the sensor cells are simultaneously turned on. The plurality of sensor cells constitutes a plurality of cell rows,
14. The sensor cell wiring structure according to claim 13, wherein when the plurality of sensor cells constituting any one of the plurality of cell rows are simultaneously turned on, the positive electrode and the negative electrode are short-circuited.

Images