JP2008258118A - Pressure detection switch and open/close device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a touch sensor of which the degrees freedom of bending are enhanced and a directional difference in the detection sensitivity is eliminated, and which is easy to assemble. <P>SOLUTION: An inner electrode 53 made in a linear shape from a flexible conductor is placed inside an outer electrode 52, made into a tubular shape from a flexible conductor. Helically formed spacer members 54 made from insulators are arranged between the outer electrode 52 and the inner electrode 53, and the spacer members 54 form a gap between the outer electrode 52 and the inner electrode 53. An inner conductor wire is placed along an axial center inside the inner electrode 53. The pitch by which an outer conductor wire 56 turns 360° about with respect to the axial center of the inner electrode 53 is set to be not larger than half the pitch, by which the spacer members 54 turn 360° between the inner electrode 53 and the outer electrode 52. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a pressure detection switch that is formed in a cable shape and detects contact with an object, and a vehicle opening / closing device using the switch.

  The automatic opening / closing device that automatically opens and closes doors, tailgates, window glass, sunroofs, etc., provided in vehicles such as automobiles, prevents obstacles from being caught by the automatic opening / closing member. Therefore, a pinch prevention function is provided. As a pressure detection switch for detecting pinching, a touch sensor called a cord switch is known. This touch sensor is formed in a cable shape and is attached to an end of an opening / closing body or an end of an opening.

  For example, in Patent Document 1, a pair of electrodes formed in a strip shape on the inner surface of a rubber tube, which is an insulator, are fixed facing each other with a predetermined gap therebetween, and conductors are arranged inside these electrodes, respectively. The rubber tube is crushed by contact with the obstacle that is the object to be detected, the electrodes come into contact with each other, and the conductor is short-circuited through each electrode so that the contact of the obstacle is detected. A touch sensor is described.

Further, Patent Document 2 is configured by fixing four conductive wires arranged at equal intervals in the circumferential direction on the inner peripheral surface of the rubber tube and spirally arranged in the longitudinal direction, respectively, by contact with an obstacle. A touch sensor is described in which a rubber tube is crushed and one of the conductive wires comes into contact with each other and is short-circuited to detect contact with an obstacle.
Japanese Patent No. 3334477 Japanese Patent Laid-Open No. 11-182136

  However, if the touch sensor shown in Patent Document 1 is bent sharply, the rubber tube may be crushed and the electrodes may come into contact with each other. Therefore, the touch sensor is attached to the door or opening according to the shape of its end. It is difficult to do. In addition, since this touch sensor detects only an external force in a direction that can narrow the gap between the pair of electrodes, there is a problem in that an obstacle that contacts the touch sensor from the lateral direction cannot be detected.

  On the other hand, in the touch sensor described in Patent Document 2, each conductor is arranged in the circumferential direction at equal intervals and in a spiral shape, so that the degree of freedom of bending is increased and from which direction It is also possible to detect contact with other obstacles.

  However, this touch sensor has a problem in that the detection sensitivity of the sensor differs depending on the position where the obstacle touches, that is, the direction in which the external force is applied, because the distance between the electrodes facing each other is different.

  An object of the present invention is to provide a touch sensor that has a high degree of freedom in bending, has no difference in detection sensitivity depending on directions, and is easy to assemble.

  The pressure detection switch of the present invention is a cable-shaped pressure detection switch that detects contact with an object, and is formed into a linear shape by an outer electrode formed in a tubular shape by a flexible conductor and a flexible conductor. An inner electrode housed in the outer electrode and an insulator, and a spacer member that is helically disposed between the inner electrode and the outer electrode to maintain a gap between the two electrodes And an inner conductor arranged along the axis of the inner electrode inside the inner electrode, and an outer conductor arranged spirally with respect to the axis of the outer electrode inside the outer electrode. The pitch at which the outer conductive wire circulates 360 degrees with respect to the axis of the outer electrode is set to ½ or less of the pitch that circulates 360 degrees between the inner electrode and the outer electrode of the spacer member. Features .

  The pressure detection switch according to the present invention is characterized in that one spacer member and one outer conductor are used.

  In the pressure detection switch of the present invention, the inner electrode is inserted into the outer electrode in a state where the spacer member is wound.

  The opening / closing body for a vehicle according to the present invention includes a motor for driving the opening / closing body provided in the vehicle, a control unit for driving and controlling the motor, and a pressure detection switch. A vehicular opening / closing device that reversely drives or stops the motor when a signal from a pressure detection switch is detected, wherein the pinching detection switch includes an outer electrode formed in a tubular shape by a flexible conductor, and a flexible An inner electrode that is formed in a linear shape by a conductor having an inner surface and accommodated in the outer electrode, and an insulator, and is disposed between the inner electrode and the outer electrode in a spiral shape between the two electrodes. A spacer member for holding a gap, an inner conductor disposed along the axis of the inner electrode in the inner electrode, and a spiral disposed in the outer electrode with respect to the axis of the outer electrode. Outside A pitch at which the outer conductive wire circulates 360 degrees with respect to the axial center of the outer electrode is set to ½ or less of a pitch at which the spacer member circulates 360 degrees between the inner electrode and the outer electrode. It is characterized by being.

  The opening / closing body for a vehicle according to the present invention is characterized in that the spacer member and the outer conductor are used one by one.

  In the opening / closing body for a vehicle according to the present invention, the inner electrode is inserted into the outer electrode in a state where the spacer member is wound.

  According to the present invention, the spacer member is spirally arranged between the outer electrode and the inner electrode, and the gap between the electrodes is uniformly maintained. The degree of freedom increases.

  In addition, since the gap between the outer electrode and the inner electrode becomes uniform, there is no difference in detection sensitivity depending on the direction.

  Further, since the pitch of the outer conductor is set to be 1/2 or less of the pitch of the spacer member, that is, in the range of the phase angle of 180 degrees centered on an arbitrary position of the spacer member, Since it is arranged over the circumference (phase angle 360 degrees), even if the outer electrode and the inner electrode are not positioned, the difference in detection sensitivity depending on the direction does not occur, and the assembling work is facilitated.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a side view showing a one-box type vehicle, and FIG. 2 is a plan view showing an automatic opening / closing device for a vehicle provided with a touch sensor as a pressure detection switch according to an embodiment of the present invention.

  A vehicle 11 shown in FIG. 1 is a one-box type passenger car, and a slide door 14 serving as an opening / closing body is provided on a side portion of the vehicle body 12, and the vehicle body is moved by moving the slide door 14 in the vehicle front-rear direction. Opening and closing of the opening 13 provided on the side of 12 is performed. As shown in FIG. 2, the slide door 14 is provided with a roller assembly 15, and the roller assembly 15 is guided by a guide rail 16 fixed to the side of the vehicle body 12. In FIG. 2, it can be opened and closed between a fully open position indicated by a solid line and a fully closed position indicated by a one-dot chain line. In addition, a curved portion 16a that curves toward the vehicle interior side is provided on the vehicle front side of the guide rail 16, and the slide door 14 is the same as the side surface of the vehicle body 12 by the roller assembly 15 being guided by the curved portion 16a. It is closed in a state where it is drawn into the inside of the vehicle body 12 so as to fit within the surface. Although not shown, the roller assembly 15 is also provided in the upper and lower portions (upper portion and lower portion) of the front end portion of the slide door 14 in addition to the portion (center portion) shown in the drawing, and the opening portion of the vehicle body 12 corresponding thereto Guide rails (not shown) corresponding to the upper portion and the lower portion are also provided at the upper and lower portions of 13, and the slide door 14 is supported by the vehicle body 12 at a total of three locations.

  As shown in FIG. 2, the vehicle 11 is provided with an automatic opening / closing device 21 (hereinafter referred to as an opening / closing device 21) in order to automatically open and close the slide door 14. The opening / closing device 21 has a drive unit 22 that is fixed to the inside of the vehicle body 12 adjacent to a substantially central portion of the guide rail 16 in the vehicle front-rear direction, and from the drive unit 22 toward the vehicle front side and the rear side. The cables 23a and 23b are drawn out, and the cable 23a drawn from the drive unit 22 to the front side of the vehicle is connected to the roller assembly from the front side (closed side) of the vehicle via a reversing pulley 24a provided at the front end of the guide rail 16. 15 is connected to the roller assembly 15 from the vehicle rear side (open side) via a reversing pulley 24b provided at the rear end of the guide rail 16. The drive unit 22 drives the cables 23a and 23b. When the cables 23a and 23b are driven by the drive unit 22, the slide door 14 is pulled by the cables 23a and 23b on the vehicle front side or rear side. It is designed to open and close automatically. That is, the switchgear 21 is a so-called cable type.

  FIG. 3 is an explanatory diagram showing a control system of the automatic opening / closing apparatus shown in FIG.

  The drive unit 22 includes an electric motor 25 as a drive source and a speed reducer 26 fixed to the electric motor 25. The speed of the electric motor 25 is reduced to a predetermined number of rotations by the speed reducer 26 and output. It is output from the shaft 27. As the electric motor 25, for example, 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 28 formed in a cylindrical shape is fixed to the output shaft 27, and the cables 23 a and 23 b are wound around the outer peripheral surface of the drum 28 a plurality of times. As a result, when the electric motor 25 rotates in the forward direction, the drum 28 rotates clockwise in FIG. 3 so that the cable 23a on the closing side is wound around the drum 28, and the slide door 14 is pulled by the cable 23a and automatically closes. To do. On the other hand, when the electric motor 25 rotates in the reverse direction, the drum 28 rotates counterclockwise in FIG. 3 and the open cable 23b is wound around the drum 28, and the slide door 14 is pulled by the cable 23b and automatically opens. To do.

  The speed reducer 26 includes an electromagnetic clutch (not shown). When the slide door 14 is manually opened and closed, the power transmission path between the electric motor 25 and the output shaft 27 is interrupted and cut off by the electromagnetic clutch. 14 manual opening and closing operation force is reduced. Although not shown, a tensioner is provided between the drum 28 and the slide door 14, and the cable tension is kept constant by the tensioner.

  A multi-pole magnetized magnet 31 having a large number of magnetic poles magnetized in the circumferential direction is fixed to the output shaft 27, and two Hall ICs 32a, When the output shaft 27 rotates, a pulse signal having a period proportional to the rotational speed of the output shaft 27 is output from the Hall ICs 32a and 32b.

  In order to control the operation of the electric motor 25, a control device 33 is connected to the electric motor 25. The control device 33 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 connected to the electric motor 25 by wiring.

  Hall ICs 32a and 32b are connected to the control device 33, and the control device 33 detects the rotation speed of the output shaft 27, that is, the moving speed of the slide door 14, based on the period of the pulse signal input from the Hall ICs 32a and 32b. Be able to. Further, the control device 33 detects the rotation direction of the electric motor 25, that is, the moving direction of the slide door 14 based on the appearance timing of these pulse signals, and further, when the slide door 14 is at the reference position (for example, the fully closed position). The opening / closing position of the slide door 14 can be detected by integrating or counting the pulse signals starting from.

  In order to command the opening / closing operation of the sliding door 14, the sliding door 14 is provided with a door handle 34 having a function as an opening / closing switch. When the door handle 34 is operated by an operator such as an occupant, an opening / closing command signal is input from the door handle 34 to the control device 33, and the control device 33 receives the input opening / closing command signal, the opening / closing position of the slide door 14, and opening / closing. The speed and the like are calculated according to the control program stored in the memory, and the operation control of the electric motor 25 is executed based on the calculation result. For example, when the door handle 34 is operated to the close side and a command signal for closing the slide door 14 is input to the control device 33, the electric motor 25 is driven forward by the control device 33 and the slide door 14 is automatically Operates in the closing direction. Conversely, when the door handle 34 is operated to the open side and a command signal for opening the slide door 14 is input to the control device 33, the electric motor 25 is driven reversely by the control device 33, and the slide door 14 is automatically Operates in the opening direction.

  In order to detect the contact between the sliding door 14 and the obstacle (detected object) and the obstacle being caught by the sliding door 14 due to the contact, the traveling direction when the sliding door 14 is closed on the vehicle front side, that is, the sliding door 14 is closed. A touch sensor unit 41 is attached to the end that is the side.

  4 (a) and 4 (b) are perspective views showing details of the touch sensor unit, FIG. 5 is a diagram schematically showing the arrangement of spacer members and outer conductors in the touch sensor of FIG. 4, and FIG. FIG. 7 is a sectional view of the touch sensor, and FIG. 7 is a circuit diagram of the touch sensor.

  As shown in FIG. 4A, the touch sensor unit 41 has a sensor holder 42 formed of rubber that is a flexible insulator, and the sensor holder 42 is provided on the slide door 14. The bracket 43 is fixed so as to be sandwiched between the sensor holders 42, and the front end of the bracket 43 protrudes further toward the vehicle front side than the end of the slide door 14. A mounting hole 42a penetrating in the vertical direction of the vehicle is formed in a portion of the sensor holder 42 that protrudes toward the vehicle front side from the end of the slide door 14, and a touch sensor formed in a cable shape in the mounting hole 42a. 51 is installed.

  Note that the sensor holder 42 may be fixed to the tip of the slide door 14 as shown in FIG.

  As shown in FIGS. 5 and 6, the touch sensor 51 has an outer electrode 52 and an inner electrode 53. The outer electrode 52 is, for example, conductive rubber (ethylene-propylene-diene rubber (EPDM)) or the like. It is formed in a tubular shape (tube shape) by a flexible conductor. The inner electrode 53 is formed in a linear shape by a flexible conductor such as conductive rubber like the outer electrode 52, and is arranged coaxially inside the outer electrode 52.

  Between the outer electrode 52 and the inner electrode 53, one spacer member 54 formed in a spiral shape by an insulator such as rubber is disposed. The spacer members 54 are arranged at the same pitch P1 over the entire length. Thereby, a uniform gap is formed between the outer electrode 52 and the inner electrode 53, and both the electrodes 52 and 53 are electrically insulated.

  Inside the inner electrode 53, one inner conductor 55 is disposed along the axis. That is, as shown in FIG. 7, the inner conductor 55 penetrates the inner electrode 53 in the longitudinal direction while being electrically connected to the inner electrode 53, and one end thereof is connected to the control device 33.

  On the other hand, inside the outer electrode 52, one outer conducting wire 56 is disposed in a spiral shape. The outer conductors 56 are arranged at the same pitch P2 over the entire length while turning in the same direction as the spacer member 54. The pitch P2 is set to ½ or less of the pitch P1 of the spacer member 54. Since the outer conductor 56 is electrically connected to the outer electrode 52, when the outer electrode 52 contacts the inner electrode 53, the outer conductor 56 and the inner conductor 55 are electrically connected. The spacer member 54 and the inner electrode 53 are molded and fixed by simultaneous molding. The inner electrode 53 around which the spacer member 54 is wound is inserted into the outer electrode 52, and the inner electrode 53 and the outer electrode 52 are fixed at both ends.

  As shown in FIG. 7, the outer conductor 56 penetrates the outer electrode 52 in the longitudinal direction, and one end thereof is grounded. The other end of the outer conductor 56 is connected to the other end of the inner conductor 55 via a detection resistor 57. That is, since the detection resistor 57 is connected in series between the inner conductor 55 and the outer conductor 56, a current flows from the control device 33 to the detection resistor 57 at all times, and a voltage drop occurs in the detection resistor 57. However, when the outer electrode 52 contacts the inner electrode 53, no current flows through the detection resistor 57, and no voltage drop occurs. That is, the contact between the outer electrode 52 and the inner electrode 53 is detected by monitoring the voltage drop of the touch sensor 51.

  FIGS. 8A to 8C are diagrams illustrating a state in which the touch sensor detects contact with an obstacle.

  For example, when the sliding door 14 is automatically closing and an obstacle comes into contact with the sensor holder 42 attached to the end thereof, the outer electrode 52 of the touch sensor 51 is deformed together with the sensor holder 42 by the contact. Thus, the outer electrode 52 contacts the inner electrode 53. When the outer electrode 52 contacts the inner electrode 53, the outer conductor 56 and the inner conductor 55 are short-circuited via these electrodes 52, 53, and a short-circuit current that does not pass through the detection resistor 57 flows through each of the conductors 55, 56. This short circuit current becomes a detection signal, and the control device 33 detects the contact of the obstacle. When the detection signal is input, the control device 33 reversely moves or stops the sliding door 14 in the opening direction, and thereby avoids the obstacle being caught by the sliding door 14.

  Here, in this touch sensor 51, since the gap between the outer electrode 52 and the inner electrode 53 is provided by one spiral spacer member 54, this gap is made uniform, and FIG. As shown in (c), even if an obstacle comes into contact with the touch sensor 51 from any direction in the circumferential direction, the detection sensitivity does not greatly differ. The pinch detection accuracy can be increased. For example, as shown in FIG. 8A, when an obstacle comes into contact with the upper side of the touch sensor 51 in the drawing, the outer electrode 52 is pushed by the obstacle, and the spacer member 54 and the inner electrode 53 are pushed together with the outer electrode 52. Thus, the inner electrode 53 contacts the outer electrode 52 on the lower side in the figure. As shown in FIGS. 5B and 5C, when an obstacle comes into contact with the touch sensor 51 from below or from the side, the outer electrode 52 pressed by the obstacle comes into contact with the inner electrode 53 as it is. However, the gap between the outer electrode 52 and the inner electrode 53 at this time, that is, the stroke of the outer electrode 52 is equivalent to that shown in FIG.

  In this touch sensor 51, a spiral spacer member 54 is disposed between the outer electrode 52 and the inner electrode 53, and a gap is held between the outer electrode 52 and the inner electrode 53 by the spacer member 54. The gap between the outer electrode 52 and the inner electrode 53 is uniform, and the contact of the obstacle from all directions can be detected with uniform detection sensitivity.

  In addition, by using the touch sensor 51 for detecting the pinching of the obstacle by the slide door 14 that automatically opens and closes, the pinching can be detected with high accuracy, and thus the safety of the opening / closing device 21 including the touch sensor 51 can be detected. Can increase the sex.

  Further, since the spacer member 54 is disposed in a spiral shape between the outer electrode 52 and the inner electrode 53, the gap between both the electrodes 52 and 53 is maintained even if it is bent suddenly, and the outer electrode 52 becomes the inner electrode. 53 becomes difficult to contact. For this reason, the freedom degree of bending is high and it can attach along complicated shapes, such as the edge part of the slide door 14. FIG.

  9 is a view showing a comparative example of FIG. 5, and FIG. 10 is a view for explaining the arrangement of the outer conductor.

  In the touch sensor 51 in the above-described embodiment, one spacer member 54 and one outer conductor 56 are used, respectively, in order to keep the outer electrode 52 in an appropriate softness and obtain a necessary detection sensitivity. . By the way, as the arrangement of the spacer member 54 and the outer conductive wire 56, the one shown in FIG. That is, the spacer member 54 and the outer conductive wire 56 are arranged at the same pitch while maintaining a phase difference of 180 degrees around the inner electrode. If it does in this way, since the outer side conducting wire 56 is arrange | positioned symmetrically regarding the spacer member 54, the same detection sensitivity is acquired with respect to all the directions (refer Fig.10 (a)). However, when the positional deviation between the outer electrode 52 and the spacer member 54 occurs, the arrangement balance of the outer conductor 56 with respect to the spacer member 54 is lost, and a difference depending on the direction of detection sensitivity occurs (see FIG. 10B). On the other hand, when the pitch P2 of the outer conductors 56 is set to ½ or less of the pitch P1 of the space member 54 as in this embodiment, the outer conductors 56 and the spacer members 54 are disposed regardless of the arrangement. The conducting wire 56 is always arranged over the entire circumference of the outer electrode 52 (see FIG. 10C). That is, it is not necessary to align the electrodes 52 and 53 during assembly, and the operation is facilitated.

  If the pitch P2 of the outer conductor 56 is reduced, the outer electrode 52 becomes hard and sufficient detection sensitivity cannot be obtained. Therefore, the lower limit of the pitch P2 must be determined in consideration of this point.

  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 above embodiment, one spacer member 54 and one outer conductor 56 are used, but a plurality of the members may be used.

  In addition, the touch sensor 51 is attached to the end of the slide door 14 as an opening / closing body, but the touch sensor 51 may be attached to the end of the opening 13 without being limited thereto.

  Moreover, although the winding direction of the spacer member and the outer conductor is the same direction, the present invention is not limited to this, and the spacer member and the outer conductor may be wound in different directions.

  In addition, the inner conductor 55 is disposed along the axis of the inner electrode 53. However, the present invention is not limited to this, and for example, the inner conductor 55 is spirally disposed along the axis of the inner electrode 53. May be.

It is a side view showing a one-box type vehicle. It is a top view which shows the automatic opening / closing apparatus for vehicles provided with the touch sensor as a pressure detection switch which is one embodiment of this invention. It is explanatory drawing which shows the control system of the automatic opening / closing apparatus shown in FIG. (A), (b) is a perspective view which shows the detail of a touch sensor unit. It is a figure which shows typically arrangement | positioning of the spacer member and outer side conducting wire in the touch sensor of FIG. It is sectional drawing of the same touch sensor. It is a circuit diagram of the touch sensor. It is sectional drawing which shows the state which the touch sensor detected the contact of the obstruction. It is a figure which shows the comparative example of FIG. It is a figure explaining arrangement | positioning of an outer side conducting wire.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Vehicle 12 Car body 13 Opening part 14 Sliding door (opening-closing body)
DESCRIPTION OF SYMBOLS 15 Roller assembly 16 Guide rail 16a Bending part 21 Automatic switching device 22 Drive unit 23a, 23b Cable 24a, 24b Reverse pulley 25 Electric motor 26 Reduction gear 27 Output shaft 28 Drum 31 Multipole magnetized magnet 32a, 32b Hall IC
33 Control Device 34 Door Handle 41 Touch Sensor Unit 42 Sensor Holder 42a Mounting Hole 43 Bracket 51 Touch Sensor (Pressure Detection Switch)
52 Outer electrode 53 Inner electrode 54 Spacer member 55 Inner conductor 56 Outer conductor 57 Detection resistance P1 Spiral pitch of spacer member P2 Spiral pitch of outer conductor

Claims (6)

A cable-shaped pressure detection switch that detects contact with an object,
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 accommodated in the outer electrode;
A spacer member formed of an insulator and arranged in a spiral between the inner electrode and the outer electrode to hold a gap between the electrodes;
An inner conductor disposed along the axis of the inner electrode inside the inner electrode;
An outer conductor arranged in a spiral with respect to the axis of the outer electrode inside the outer electrode;
The pitch at which the outer conducting wire circulates 360 degrees with respect to the axis of the inner electrode is set to ½ or less of the pitch that circulates 360 degrees between the inner electrode and the outer electrode of the spacer member. Characteristic pressure detection switch.   2. The pressure detection switch according to claim 1, wherein the spacer member and the outer conductor are used one by one.   3. The pressure detection switch according to claim 1, wherein the inner electrode is inserted into the outer electrode in a state where the spacer member is wound. A drive source for driving an opening / closing body provided in the vehicle;
A control unit for driving and controlling the drive source;
A pressure detection switch electrically connected to the control unit for detecting foreign matter between the vehicle body and the opening and closing body;
When the control unit detects a signal from the pressure detection switch, the vehicular opening / closing device is configured to drive or stop the driving source in reverse rotation,
The pinching detection switch is
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 accommodated in the outer electrode;
A spacer member formed of an insulator and arranged in a spiral between the inner electrode and the outer electrode to hold a gap between the electrodes;
An inner conductor disposed along the axis of the inner electrode inside the inner electrode;
An outer conductor arranged in a spiral with respect to the axis of the outer electrode inside the outer electrode;
The pitch at which the outer conductive wire circulates 360 degrees with respect to the axis of the outer electrode is set to ½ or less of the pitch at which the spacer member circulates 360 degrees between the inner electrode and the outer electrode. An opening / closing device for a vehicle.   5. The vehicle opening / closing device according to claim 4, wherein the spacer member and the outer conductor are used one by one.   6. The vehicular switchgear according to claim 4 or 5, wherein the inner electrode is inserted into the outer electrode in a state where the spacer member is wound.

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