JP2009259688A - Pressure detecting switch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pressure detecting switch simplified in a manufacturing process thereof by eliminating variations of the short circuit current per product. <P>SOLUTION: A winding direction of a spiral of a spacer member 53 and a winding direction of a spiral of an outside lead wire 54 are set to be opposite to each other. Independently of arrangement of the spacer member 53 relative to the outside lead wire 54 in the axial direction, parts P1-P3 of the outside lead wire 54 can be arranged in the most flexible part of the spacer member 53 in the spiral pitch PS. variations of the short circuit current per product can be eliminated without considering arrangement of the outside lead wire 54 and the spacer member 53 in the axial direction, and adjustment of detecting sensitivity on a control device side becomes unnecessary, and the spacer member 53 and an inside electrode 52 can be simply assembled in the outside electrode 51. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a pressure detection switch that is formed in a cable shape and detects contact of an object to be detected.

  2. Description of the Related Art Conventionally, some vehicles such as automobiles include an automatic opening / closing device that automatically opens and closes an opening / closing body such as a slide door or a sunroof provided in the vehicle. The automatic opening / closing device includes an electric motor driven by an operation switch provided in a vehicle interior or the like, and opens / closes the opening / closing body by rotationally driving the electric motor by the operation switch.

  The automatic opening / closing device is provided with a pinching prevention function in order to prevent an obstacle (detected object) from being pinched by an opening / closing body that automatically opens and closes. The automatic switchgear is provided with a pressure detection switch that detects the contact of an obstacle. When the pressure is detected by the pressure detection switch, that is, when the contact of the obstacle is detected, the rotation drive of the electric motor is stopped or reversed. Like to do. Thereby, it is possible to prevent an obstacle from being caught by the opening / closing body.

  The pressure detection switch is formed in a cable shape and is attached to the end of the opening / closing body or the end of the opening. As a technique provided with such a pressure detection switch, for example, one described in Patent Document 1 is known.

  The pressure detection switch described in Patent Document 1 includes an outer electrode formed in a tubular shape by a conductor and having a spiral outer conductor inside, an inner electrode formed in a conductor by a conductor and having an inner conductor inside, and an insulator And a spacer member formed in a spiral shape and disposed between the electrodes. The outer conducting wire and the spacer member are set so that the spiral winding direction is the same and has the same helical pitch, and the outer conducting wire is arranged at the central portion between the spiral pitches of the spacer member. That is, the outer conductive wire and the spacer member are arranged with a phase difference of 180 ° from each other in the axial direction of each electrode.

When the outer electrode is elastically deformed by an obstacle coming into contact with the outer electrode, a portion between the spiral pitches of the spacer member in the outer electrode is brought into contact with the inner electrode, thereby the outer electrode provided inside each electrode. The conducting wire and the inner conducting wire are short-circuited via the outer electrode and the inner electrode. The controller detects the short-circuit current at this time, thereby detecting the contact of the obstacle.
Japanese Patent Laying-Open No. 2007-335266 (FIG. 5)

  However, according to the pressure detection switch described in Patent Document 1 described above, a product (product A) in which an outer conductor is disposed in the center portion between the helical pitches of the spacer member due to an assembly error in the manufacturing process, and the like In some cases, a product (product B) arranged so as to overlap the conductor and the spacer member in the radial direction may be generated. In this case, the product A and the product B vary in the magnitude of the short-circuit current for the following reasons.

  The outer electrode is most easily bent at the central portion between the helical pitches of the spacer members. Therefore, in product A, the distance between the contact portion (contact point) of the outer electrode with respect to the inner electrode and the outer conductive wire is shortened, and in product B, the distance between the contact point and the outer conductive wire is increased. Since the outer electrode has a certain amount of internal resistance, if there is a difference in the distance from the contact point to the outer conductor as in the products A and B, a difference also occurs in the magnitude of the short circuit current.

  Therefore, in order to absorb the variation in the short-circuit current for each product, it is necessary to adjust the detection sensitivity of the short-circuit current on the control device side, which requires a work process for that and causes an increase in manufacturing cost. . On the other hand, in order to stably manufacture either product A or product B, it is also conceivable to eliminate assembly errors and the like. In this case, it is necessary to manufacture the spacer member with respect to the outer conductive wire so as to be uniform with high accuracy for each product, which may cause a problem that the manufacturing process becomes complicated.

  An object of the present invention is to provide a pressure detection switch capable of simplifying the manufacturing process by eliminating variations in short-circuit current between products.

  The pressure detection switch of the present invention is a pressure detection switch that is formed in a cable shape and detects contact of an object to be detected, and has flexibility with an outer electrode formed in a tubular shape by a flexible conductor. An inner electrode formed in a linear shape by a conductor and disposed inside the outer electrode, and formed by an insulator, and disposed in a spiral shape on the surface of the inner electrode, thereby forming the outer electrode and the inner electrode. A spacer member that forms a gap therebetween, and an outer conductive wire that is spirally provided inside the outer electrode and is electrically connected to the outer electrode so as to be in a winding direction opposite to the spiral winding direction of the spacer member And an inner conductor provided inside the inner electrode and electrically connected to the inner electrode.

  The pressure detection switch according to the present invention is characterized in that a spiral pitch of the outer conductor is different from a spiral pitch of the spacer member.

  The pressure detection switch according to the present invention is characterized in that a spiral pitch of the outer conductor is made shorter than a spiral pitch of the spacer member.

  The pressure detection switch according to the present invention is characterized in that a plurality of outer conductors are provided inside the outer electrode.

  According to the present invention, since the spiral winding direction of the spacer member and the spiral winding direction of the outer electrode are respectively opposite to each other, the positional relationship in the axial direction of the spacer member with respect to the outer conductor is concerned. First, it becomes possible to arrange a part of the outer conductor in the central portion between the helical pitches of the spacer member. Therefore, it is possible to eliminate variations in short-circuit current for each product without considering the positional relationship of the spacer member in the axial direction with respect to the outer conductor. Since variations in short-circuit current among products can be eliminated, the spacer member and the inner electrode can be simply incorporated inside the outer electrode, and the manufacturing process can be simplified.

  According to the present invention, the spiral pitch of the outer conductor can be made different from the spiral pitch of the spacer member, and even in this case, a part of the outer conductor can be arranged at the central portion between the spiral pitches of the spacer member. it can. By making the spiral pitch of the outer conductors shorter than the spiral pitch of the spacer members, it is possible to increase the number of outer conductors arranged in the center part between the spiral pitches of the spacer members, improving the detection sensitivity of the pressure detection switch Can be made.

  According to the present invention, it is possible to provide a plurality of outer conductors inside the outer electrode, and in this case as well, it is possible to increase the number of outer conductors arranged in the central portion between the helical pitches of the spacer member, The detection sensitivity of the detection switch can be improved.

  Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings. 1 is a side view showing a one-box type vehicle, FIG. 2 is a plan view showing an automatic opening / closing device equipped with a pressure detection switch according to the present invention, and FIG. 3 is a control system of the automatic opening / closing device of FIG. FIG.

  As shown in FIG. 1, the vehicle 10 is a one-box type passenger vehicle, and an opening 12 a is provided in a side portion 12 of a vehicle body 11 that forms the vehicle 10. The opening 12a is opened and closed by a sliding door 13 as an opening / closing body that slides in the front-rear direction of the vehicle body 11 as indicated by a two-dot chain arrow in the figure.

  As shown in FIG. 2, the slide door 13 is provided with a roller assembly 14, and the roller assembly 14 is guided by a guide rail 15 fixed to the side portion 12 of the vehicle body 11. It slides between a fully open position indicated by a solid line in the figure and a fully closed position indicated by a two-dot chain line. A curved portion 15a that curves toward the vehicle interior side (upper side in the figure) is provided on the vehicle body front side of the guide rail 15, and the roller door 14 is guided by the curved portion 15a. It is closed in a state where it is drawn inside the vehicle body 11 so as to be in the same plane as the side portion 12 of the vehicle body 11.

  Here, although not shown, the roller assembly 14 is also provided in the upper and lower portions of the front end portion of the slide door 13 in addition to the portion shown in the drawing, and correspondingly to the upper and lower portions of the opening 12a of the vehicle body 11, respectively. Guide rails are provided. Thus, the sliding door 13 is supported by the vehicle body 11 at a total of three locations, and thus the sliding door 13 can stably slide.

  As shown in FIG. 2, an automatic opening / closing device 20 that automatically opens and closes the sliding door 13 is mounted on the vehicle body 11. The automatic opening / closing device 20 includes a drive unit 21 that is fixed to the vehicle body 11 adjacent to a substantially central portion of the guide rail 15 in the vehicle longitudinal direction. Cables 22a and 22b are drawn from the drive unit 21 toward the front and rear sides of the vehicle body. A cable 22a drawn from the drive unit 21 to the front side of the vehicle body is connected to the roller assembly 14 from the front side of the vehicle body via a reversing pulley 23a provided on the front end side of the guide rail 15, and is drawn to the rear side of the vehicle body. 22 b is connected to the roller assembly 14 from the rear side of the vehicle body via a reversing pulley 23 b provided on the rear end side of the guide rail 15.

  The drive unit 21 drives the cables 22a and 22b. When the cables 22a and 22b are driven by the drive unit 21, the slide door 13 is pulled by the cables 22a and 22b on the vehicle body front side or rear side. It opens and closes automatically. That is, the automatic opening / closing device 20 is a so-called cable type.

  As shown in FIG. 3, the drive unit 21 has an electric motor 24 as a drive source and a speed reducer 25 fixed to the electric motor 24, and the rotation of the electric motor 24 is predetermined by the speed reducer 25. It is decelerated to the number of rotations and is output from the output shaft 26. Here, as the electric motor 24, a motor that can rotate in both forward and reverse directions, such as a brushed DC motor or a brushless DC motor, is used.

  A drum 27 formed in a cylindrical shape is fixed to the output shaft 26, and the cables 22 a and 22 b are wound around the outer peripheral surface of the drum 27 a plurality of times. As a result, when the electric motor 24 rotates in the forward direction, the drum 27 rotates in the clockwise direction in the drawing, the cable 22a on the closing side is wound around the drum 27, and the slide door 13 is pulled by the cable 22a to perform the closing operation. On the contrary, when the electric motor 24 rotates in the reverse direction, the drum 27 rotates counterclockwise in the drawing, the open cable 22b is wound around the drum 27, and the slide door 13 is pulled by the cable 22b and opened. Operate.

  An electromagnetic clutch (not shown) is provided inside the speed reducer 25. The electromagnetic clutch cuts off the power transmission path between the electric motor 24 and the output shaft 26 when the slide door 13 is manually opened / closed to reduce the opening / closing operation force of the slide door 13. . Between the drum 27 and the slide door 13, a tensioner mechanism (not shown) for applying a predetermined tension to each cable 22a, 22b is provided. The tensioner mechanism is caused by long-term use of the automatic opening / closing device 20. The extension of each cable 22a, 22b is absorbed.

  A multipolar magnetized magnet 28 having a large number of magnetic poles magnetized in the circumferential direction is fixed to the output shaft 26, and two holes are provided in the vicinity of the multipolar magnetized magnet 28 with a predetermined phase difference therebetween. ICs 29a and 29b are arranged. When the output shaft 26 rotates, a pulse signal having a period proportional to the rotation speed of the output shaft 26 is output from each Hall IC 29a, 29b.

  The automatic opening / closing device 20 includes a control device 30 that controls the rotational drive of the electric motor 24. The control device 30 has a function as a so-called microcomputer having a microprocessor (CPU), a memory such as a ROM and a RAM (not shown), and is electrically connected to the electric motor 24 via wiring. .

  Each Hall IC 29a, 29b is connected to the control device 30, and the control device 30 moves the rotational speed of the output shaft 26, that is, the movement of the slide door 13, based on the period of the pulse signal input from each Hall IC 29a, 29b. The speed can be detected. Further, the control device 30 detects the rotation direction of the output shaft 26, that is, the moving direction of the slide door 13 based on the appearance timing of these pulse signals, and further, the slide door 13 is in a reference position (for example, a fully closed position). The opening / closing position of the slide door 13 can be detected by counting the pulse signal starting from the time when the slide door 13 is located.

  The slide door 13 is provided with a door handle 31, and the door handle 31 has a function as an opening / closing switch for opening and closing the slide door 13. When the operator operates the door handle 31, an opening / closing command signal is input from the door handle 31 to the control device 30, and the control device 30 stores the input opening / closing command signal, the opening / closing position, opening / closing speed, etc. of the slide door 13. The calculation is performed according to the control program stored therein, and the rotational drive control of the electric motor 24 is executed based on the calculation result. For example, when the door handle 31 is closed and a command signal for closing the slide door 13 is input to the control device 30, the electric motor 24 is rotated forward by the control device 30 and the slide door 13 is closed. In contrast, when the door handle 31 is opened and a command signal for opening the slide door 13 is input to the control device 30, the electric motor 24 is reversed by the control device 30 and the slide door 13 is opened. To do.

  A sensor unit 40 is attached to the front side of the vehicle body of the slide door 13, that is, the end portion that becomes the traveling direction side when the slide door 13 is closed. The sensor unit 40 detects contact between the slide door 13 and the obstacle DA (see FIG. 1) as an object to be detected, and pinching of the obstacle DA by the slide door 13 due to the contact.

  4 (a) and 4 (b) are explanatory views for explaining the mounting state of the sensor unit, FIGS. 5 (a) and 5 (b) are sectional views for explaining the detailed structure of the pressure detection switch, and FIG. 6 is a pressure detection. A circuit diagram of each switch is shown.

  As shown in FIG. 4A, the sensor unit 40 includes a sensor holder 41 formed of rubber that is a flexible insulator. The sensor holder 41 is fixed so that a bracket 42 provided on the slide door 13 is sandwiched between the sensor holders 41, and a tip portion of the sensor holder 41 protrudes further forward of the vehicle body than an end portion of the slide door 13.

  A mounting hole 41 a penetrating in the vertical direction of the vehicle body is formed in a portion of the sensor holder 41 that protrudes toward the front side of the vehicle body from the end portion of the slide door 13. A pressure detection switch 50 formed in a long cable shape is mounted in the mounting hole 41a. However, as a method of attaching the sensor unit 40 to the slide door 13, as shown in FIG. 4B, the sensor holder 41 may be directly fixed to the distal end side of the slide door 13.

  As shown in FIG. 5, the pressure detection switch 50 includes an outer electrode 51 and an inner electrode 52. The outer electrode 51 is formed in a tubular shape (tube shape) by a flexible conductor such as conductive rubber (ethylene-propylene-diene rubber (EPDM)), and the inside is hollow. The inner electrode 52 is formed in a solid line shape by a flexible conductor such as conductive rubber like the outer electrode 51, and is coaxial with the outer electrode 51 on the inner side (hollow part) of the outer electrode 51. It is arranged to be.

  Between the outer electrode 51 and the inner electrode 52, for example, one spacer member 53 formed of an insulator such as rubber is provided. The spacer member 53 is spirally disposed on the surface of the inner electrode 52, thereby forming a gap O between the outer electrode 51 and the inner electrode 52. As shown in FIG. 5 (b), the spacer member 53 is formed so that the inner electrode 52 is wound around in the direction of arrow R and the tip side thereof advances toward the back side in the figure. The winding direction of the spacer member 53 is as follows. It is a right-hand thread.

  Thus, by providing the spacer member 53 in a spiral shape between the outer electrode 51 and the inner electrode 52, the radial dimension of the gap O is substantially uniform at each position in the longitudinal direction and the circumferential direction of the pressure detection switch 50. It tries to become. Therefore, in a normal state where the external force F is not applied to the outer electrode 51, the outer electrode 51 and the inner electrode 52 are electrically insulated from each other by the spacer member 53.

  Inside the outer electrode 51, one outer conductive wire 54 is provided in a spiral shape so as to be in a direction opposite to the spiral winding direction of the spacer member 53, and the outer conductive wire 54 is electrically connected to the outer electrode 51. It is connected to the. As shown in FIG. 5 (b), the outer conductive wire 54 is formed so that the inner electrode 52 is wound around in the direction of the arrow L and the tip side thereof proceeds to the back side in the figure. The winding direction of the outer conductive wire 54 is as follows. It has a left-hand thread shape.

  As shown in FIG. 5A, the helical pitch PS of the spacer member 53 and the helical pitch PE1 of the outer conductor 54 are set to the same size (PS = PE1). The conducting wires 54 are provided in an arrangement relationship having a phase difference of about 180 ° in the axial direction of the electrodes 51 and 52, respectively.

  Since both the spacer member 53 and the outer conductor 54 are set to the same spiral pitch (PS = PE1), they intersect each other when the phase advances by 180 °, and the central portion between the spiral pitch PS of the spacer member 53 That is, a part of the outer conductive wire 54 (black dot portions P1 to P3 in the figure) is arranged in the most flexible portion of the outer electrode 51.

  An inner conductor 55 is provided along the axis of the inner electrode 52, and the inner conductor 55 is electrically connected to the inner electrode 52. However, the inner conductor 55 may be provided in a spiral shape so as to have a predetermined helical pitch inside the inner electrode 52. In this case, even if an external force is applied in the axial direction of the inner electrode 52, the inner conductor 55 It becomes possible to prevent disconnection of the conducting wire 55 with certainty.

  As shown in FIG. 6, a resistor 60 is provided on one end side (upper side in the figure) of the outer conductor 54 and the inner conductor 55 forming the pressure detection switch 50, and the resistor 60 is interposed between the conductors 54 and 55. Electrically connected. Further, the other end side (the lower side in the figure) of the outer conductive wire 54 is electrically connected to the control device 30, and the other end side of the inner conductive wire 55 is electrically connected (grounded) to the vehicle body 11.

  In a normal state in which the conductors 54 and 55 are not short-circuited, the control device 30 detects a normal current (small current) passing through the resistor 60, and if there is no contact with the obstacle DA (see FIG. 1). It comes to judge. On the other hand, when each of the conducting wires 54 and 55 is short-circuited, the control device 30 detects a short-circuit current (large current), thereby determining that there is a contact with the obstacle DA.

  As described above, the control device 30 determines the contact of the obstacle DA by detecting the normal current and the short-circuit current. When the normal current is detected, the control device 30 rotates the electric motor 24 as usual. When the sliding door 13 is driven to open and close and a short-circuit current is detected, the electric motor 24 is stopped or reversely driven to prevent the obstacle DA from being caught by the sliding door 13.

  Next, the operation of the pressure detection switch 50 according to the first embodiment configured as described above will be described in detail with reference to the drawings.

  As shown in FIG. 5, the portions P <b> 1 to P <b> 3 of the outer conductive wire 54 are arranged in the most flexible portion of the outer electrode 51 between the spiral pitch PS of the spacer member 53. Therefore, when an external force F is applied to the outer electrode 51, for example, when the obstacle DA comes into contact with the pressure detection switch 50, the outer electrode 51 is elastically deformed. The inner wall contacts the outer wall of the inner electrode 52. Then, the outer conductor 54 is short-circuited to the inner conductor 55 via the outer electrode 51 and the inner electrode 52. At this time, since the distance between the contact portion (contact point) of the outer electrode 51 with respect to the inner electrode 52 and the outer conductor 54 is sufficiently short, the control device 30 can detect a sufficiently short circuit current.

  Here, in the manufacturing process of the pressure detection switch 50, the operation of the pressure detection switch 50 when there is a deviation in the arrangement relationship of the spacer member 53 with respect to the outer electrode 51 will be described. FIG. 7 is an explanatory diagram for explaining a short-circuit state when an assembly error or the like occurs during manufacturing.

  As shown in FIG. 7, even if the phase difference between the outer conductor 54 and the spacer member 53 is approximately 70 ° in the manufacturing process of the pressure detection switch 50, the outer conductor 54 and the spacer Since the member 53 is provided in a spiral shape so as to have opposite winding directions (arrow R and arrow L), the most flexible portion of the outer electrode 51 between the spiral pitch PS of the spacer member 53 is Parts P1 to P3 of the outer conductor 54 are arranged. Therefore, similarly to the pressure detection switch 50 shown in FIG. 5, the control device 30 can detect a sufficiently large short-circuit current, and there is no difference in the magnitude of the short-circuit current.

  As described above in detail, according to the pressure detection switch 50 according to the first embodiment, the spiral winding direction of the spacer member 53 and the spiral winding direction of the outer conductor 54 are respectively opposite to each other. I have to.

  Accordingly, regardless of the positional relationship in the axial direction of the spacer member 53 with respect to the outer conductive wire 54, the portions P1 to P3 of the outer conductive wire 54 are placed in the central portion between the helical pitch PS of the spacer member 53, that is, the most flexible portion. It becomes possible to arrange. Since it is possible to eliminate variations in short-circuit current for each product without considering the positional relationship of the spacer member 53 in the axial direction with respect to the outer conductor 54, adjustment of detection sensitivity on the control device 30 side is unnecessary, and The spacer member 53 and the inner electrode 52 can be simply incorporated inside the outer electrode 51. Therefore, the manufacturing process can be simplified and the manufacturing cost can be greatly reduced.

  Next, a second embodiment of the present invention will be described in detail with reference to the drawings. FIGS. 8A and 8B are cross-sectional views illustrating the detailed structure of the pressure detection switch according to the second embodiment. Note that parts having the same functions as those of the first embodiment described above are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 8, the pressure detection switch 70 according to the second embodiment is different from the pressure detection switch 50 according to the first embodiment in the spiral pitch PE2 of the outer conductor 54 and the spiral pitch of the spacer member 53. The spiral pitch PE2 is shorter than the spiral pitch PS. The spiral pitch PE2 of the outer conductor 54 is set to half the spiral pitch PS of the spacer member 53 (PE2 = PS / 2).

  In the most flexible portion of the outer electrode 51 between the spiral pitch PS of the spacer member 53, more portions P1 to P4 (black dot portions in the drawing) of the outer conductor 54 than in the first embodiment are arranged. Therefore, also in the pressure detection switch 70 according to the second embodiment, the same function and effect as the first embodiment can be achieved. In addition to this, in the second embodiment, the portions P1 to P4 of the outer conductive wire 54 disposed in the most flexible portion of the outer electrode 51 between the spiral pitch PS of the spacer member 53 can be increased. The detection sensitivity of the detection switch can be improved.

  Next, a third embodiment of the present invention will be described in detail with reference to the drawings. FIGS. 9A and 9B are cross-sectional views illustrating the detailed structure of the pressure detection switch according to the third embodiment. Note that parts having the same functions as those of the first embodiment described above are denoted by the same reference numerals, and detailed description thereof is omitted.

  As illustrated in FIG. 9, the pressure detection switch 80 according to the third embodiment includes a plurality of outer conductors 54 a to 54 c (inside the outer electrode 51) as compared with the pressure detection switch 50 according to the first embodiment. The difference is that a total of 3) is provided. The outer conductors 54 a to 54 c are provided at equal intervals in the axial direction of the electrodes 51 and 52, and the interval T between the outer conductors 54 a to 54 c is 1 / spiral pitch PS of the spacer member 53. Is set to 3 (T = PS / 3).

  In the most flexible portion of the outer electrode 51 between the helical pitch PS of the spacer member 53, the portions P1 to P7 (black dot portions in the drawing) of the outer conductors 54a to 54c that are more than in the first embodiment are arranged. Yes. Therefore, also in the pressure detection switch 80 which concerns on 3rd Embodiment, there can exist an effect similar to 1st Embodiment. In addition to this, in the third embodiment, it is possible to increase the portions P1 to P7 of the outer conductors 54a to 54c arranged in the most flexible portion of the outer electrode 51 between the spiral pitch PS of the spacer member 53. As in the second embodiment, the detection sensitivity of the pressure detection switch can be improved.

  The present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the invention. For example, in the second embodiment, the spiral pitch PE2 of the outer conductor 54 is shorter than the spiral pitch PS of the spacer member 53 (PE2 = PS / 2). However, the present invention is not limited to this. The spiral pitch PE2 of the outer conductor 54 can be made longer than the spiral pitch PS of the spacer member 53 (for example, PE2 = 2PS). Even in this case, a part of the outer conductor 54 can be disposed in the central portion between the spiral pitch PS of the spacer member 53, that is, the portion that is most easily bent.

  In the above embodiments, the pressure detection switch 50 is attached to the end portion of the slide door 13 provided on the side portion 12 of the vehicle body 11. However, the present invention is not limited to this, and the opening portion is provided. The pressure detection switch 50 can also be attached to the end portion 12a (the pillar PL shown in FIG. 1).

  Further, in each of the above embodiments, the pressure detection switch 50 is applied to the function of preventing the sliding door 13 that is opened and closed by the automatic opening and closing device 20, but the present invention is not limited to this, and the automatic opening and closing is performed. The present invention can also be applied to a pinching prevention function for hinged doors, back doors, window glass, sunroofs, trunk lids and the like that are opened and closed by the device.

It is a side view showing a one-box type vehicle. It is a top view which shows the automatic switchgear provided with the pressure detection switch which concerns on this invention. It is explanatory drawing explaining the control system of the automatic opening / closing apparatus of FIG. (A), (b) is explanatory drawing explaining the attachment state of a sensor unit. (A), (b) is sectional drawing explaining the detailed structure of a pressure detection switch. It is a circuit diagram of a pressure detection switch. It is explanatory drawing explaining the short circuit state when an assembly | attachment error etc. arise at the time of manufacture. (A), (b) is sectional drawing explaining the detailed structure of the pressure detection switch which concerns on 2nd Embodiment. (A), (b) is sectional drawing explaining the detailed structure of the pressure detection switch which concerns on 3rd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Vehicle 11 Car body 12 Side part 12a Opening part 13 Sliding door 14 Roller assembly 15 Guide rail 15a Bending part 20 Automatic opening / closing device 21 Drive unit 22a, 22b Cable 23a, 23b Reverse pulley 24 Electric motor 25 Reduction gear 26 Output shaft 27 Drum 28 Multipolar magnetized magnet 29a, 29b Hall IC
DESCRIPTION OF SYMBOLS 30 Control apparatus 31 Door handle 40 Sensor unit 41 Sensor holder 41a Mounting hole 42 Bracket 50 Pressure detection switch 51 Outer electrode 52 Inner electrode 53 Spacer member PS Spiral pitch (spacer member)
54 Outer Conductor 54a-54c Outer Conductor (Third Embodiment)
P1 to P7 part (a part of the outer conductor)
PE1, PE2 spiral pitch (outside conductor)
55 Inner conductor 60 Resistance 70 Pressure detection switch (second embodiment)
80 Pressure detection switch (Third embodiment)
DA obstacle (detected object)
O Clearance PL Pillar

Claims (4)

A pressure detection switch that is formed in a cable shape and detects contact of an object to be detected,
An outer electrode formed in a tubular shape by a flexible conductor;
An inner electrode formed in a linear shape by a flexible conductor and disposed inside the outer electrode;
A spacer member that is formed of an insulator and is formed in a spiral shape on the surface of the inner electrode to form a gap between the outer electrode and the inner electrode;
An outer conductive wire spirally provided inside the outer electrode so as to be in a winding direction opposite to the spiral winding direction of the spacer member, and electrically connected to the outer electrode;
A pressure detection switch comprising: an inner conductor provided inside the inner electrode and electrically connected to the inner electrode.   The pressure detection switch according to claim 1, wherein a spiral pitch of the outer conductor is different from a spiral pitch of the spacer member.   The pressure detection switch according to claim 2, wherein a spiral pitch of the outer conductor is made shorter than a spiral pitch of the spacer member.   The pressure detection switch according to any one of claims 1 to 3, wherein a plurality of outer conductive wires are provided inside the outer electrode.

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