JP2019024014A - Foreign matter detection sensor - Google Patents

Abstract

To provide a foreign matter detection sensor capable of suppressing deterioration of a waterproof performance.SOLUTION: A foreign matter detection sensor 13 has a hollow insulator 22 which is long-sized and is hollow, and a long-sized sensor part 21 having a plurality of electrode wires 23 and 24 arranged inside of the hollow insulator 22 so as to be separated from each other. The foreign matter detection sensor 13 has a metal wire 53 for supplying electric power to the electrode wires 23 and 24 extracted from a longitudinal end side of the hollow insulator 22 to the outside, an outer cover 54 covering the metal wire 53, and a lead wire having a sheath 55 covering the metal wire 53 by covering the outer cover 54. The foreign matter detection sensor 13 has a sealing member 34 molded with a resin, which includes the end of the hollow insulator 22, the end of the electrode wires 23 and 24, the end of the metal wire 53 and the sheath 55. The hollow insulator 22, the outer cover 54 and the sheath 55 are formed of a material which is dissolved at a temperature at which the resin of the sealing member 34 is in a fluid state.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a foreign object detection sensor.

  2. Description of the Related Art Conventionally, an electric door opening / closing device that opens and closes openings (such as entrances and exits) formed in a vehicle body by electrically moving a door panel by a driving force of a motor or the like may be mounted on the vehicle. The electric door opening and closing device includes a foreign object for detecting a foreign object existing between the peripheral part of the opening and the door panel in order to detect the foreign object sandwiched between the peripheral part of the opening and the door panel. Some have a detection sensor (see, for example, Patent Documents 1 to 3).

  The foreign matter detection sensor has a long cylindrical shape having a long cylindrical portion and a sensor portion including an electrode wire inside the cylindrical portion. The foreign matter detection sensor is connected so that the end of the electrode wire and a lead wire (power supply line) connected to an external power source are connected at the end thereof. And the waterproofness of the said connection location is ensured by molding the edge part of an electrode wire and the edge part of a lead wire with resin (dissolved resin). At this time, for example, the cylindrical portion of the sensor portion and the sheath covering the conductor wire of the lead wire are both molded with resin.

Japanese Patent Laid-Open No. 11-191337 JP 2010-15696 A JP 2007-55590 A

  By the way, in the foreign matter detection sensor as described above, for example, when the cylindrical portion and the dissolved resin are different materials, the resin cured with respect to the cylindrical portion is in close contact with the outer periphery of the cylindrical portion. (Watertightness) is ensured. However, since the cylindrical part and the dissolved resin are different materials, the physical properties (elasticity, heat resistance, etc.) and the degree of deterioration over time are different, and the adhesion between the cylindrical part and the dissolved resin is reduced. There is a risk that the waterproof performance will deteriorate.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a foreign object detection sensor capable of suppressing a decrease in waterproof performance.

  A foreign object detection sensor that solves the above problems includes a long hollow cylindrical portion and a long sensor portion having a plurality of electrode wires that are spaced apart from each other inside the cylindrical portion, and the cylindrical shape. Resin including the lead wire for supplying power to the electrode wire drawn out from the longitudinal end of the portion, the end of the cylindrical portion, the end of the electrode wire, and the end of the lead wire The lead wire has a conductor wire and an insulating portion that covers the conductor wire, and the seal portion is molded with resin including the end portion of the conductor wire and the insulating portion. The cylindrical portion and the insulating portion are made of a material that melts at a temperature in which the resin flows, and the length of the portion molded by the seal portion in the longitudinal direction of the insulating portion is the cylindrical shape. The seal part in the longitudinal direction of the part The insulating portion has an outer skin that covers the outer side of the conductor wire and a sheath that covers the outer side of the outer skin, and the portion molded by the seal portion of the insulating portion The outer skin has a portion molded by the seal portion, and the outer sheath has a portion molded by the seal portion.

  In the foreign matter detection sensor, the sensor portion and the lead wire are arranged in parallel, and the seal portion has a length in a longitudinal direction of a portion where the lead wire is molded, of a portion where the sensor portion is molded. It is longer than the length in the longitudinal direction.

  In the foreign matter detection sensor, the cylindrical portion and the insulating portion are made of the same material as the resin.

  According to the foreign matter detection sensor of the present invention, it is possible to suppress a decrease in waterproof performance.

It is the schematic of the vehicle carrying the foreign material detection sensor in embodiment. It is a block diagram which shows the electric constitution of the electric back door apparatus in the same as the above. It is a perspective view of the sensor part in the same as the above. It is a fragmentary sectional view of the foreign substance detection sensor in the same as the above. (A) is a fragmentary sectional view of the foreign substance detection sensor in another example, (b) is a 5B-5B sectional view of (a).

Hereinafter, an embodiment of the foreign matter detection sensor will be described.
As shown in FIG. 1, the vehicle 1 is equipped with an electric back door device 2. A rear opening 4 is formed at the rear of the vehicle body 3 constituting the vehicle 1. The rear opening 4 is opened and closed by a door panel 5 having a shape corresponding to the rear opening 4. The upper end of the door panel 5 is rotatably connected to the upper end of the rear side surface of the vehicle body 3, and the lower end of the door panel 5 moves in the vertical direction around the connection portion with the vehicle body 3. Can be rotated. The door panel 5 is moved between the fully closed position and the fully open position. The fully closed position is a position where the door panel 5 completely closes the rear opening 4, and the fully open position is a position where the door panel 5 completely opens the rear opening 4.

  As shown in FIGS. 1 and 2, the door panel 5 is connected to a drive mechanism (not shown) provided with an actuator 6 and disposed on the vehicle body 3 side. In the electric back door device 2, when the actuator 6 is driven, the door panel 5 is rotated in the vertical direction to open and close the rear opening 4.

  As shown in FIG. 2, the actuator 6 includes a motor 7 and a speed reduction mechanism (not shown) that decelerates and outputs the rotation of the motor 7. Further, a position detection device 8 for detecting the rotation of the motor 7 is disposed in the actuator 6. The position detection device 8 includes, for example, a magnet provided to rotate integrally with a rotation shaft (not shown) of the motor 7 or a reduction gear (not shown) that constitutes the speed reduction mechanism, and a hole disposed opposite to the magnet. IC (not shown). And Hall IC outputs the pulse signal according to the change of the magnetic field by rotation of a magnet as a position detection signal.

  Further, the electric back door device 2 includes an operation switch 9 for instructing opening / closing of the door panel 5. As shown in FIGS. 1 and 2, the operation switch 9 rotates the door panel 5 so as to open the rear opening 4 when operated by a passenger or the like of the vehicle 1 to open the rear opening 4. An open signal is output to the effect. On the other hand, when the operation switch 9 is operated so as to close the rear opening 4 by a passenger or the like, the operation switch 9 outputs a closing signal for rotating the door panel 5 so as to close the rear opening 4. The operation switch 9 is provided in a predetermined part (dashboard or the like) in the vehicle interior, a door lever (not shown) of the door panel 5, a carried item (not shown) carried along with the ignition key, and the like.

  The electric back door device 2 also includes a foreign object detection device 11 for detecting a foreign object existing between the peripheral edge of the door panel 5 and the peripheral edge of the rear opening 4 that faces the peripheral edge of the door panel 5. Yes. The foreign object detection device 11 includes a foreign object detection sensor 13 attached to the peripheral edge of the door panel 5 via a bracket 12, and an energization detection part 14 electrically connected to the foreign object detection sensor 13.

  As shown in FIG. 1, the bracket 12 is fixed to a peripheral edge of the door panel 5 that faces the peripheral edge of the rear opening 4, and more specifically, the inner surface of the door panel 5 (that is, the side surface of the door panel 5 on the passenger compartment side). ) In both the left and right ends. Each bracket 12 has a substantially strip shape extending up and down the door panel 5 along both left and right ends of the door panel 5.

As shown in FIG. 1, the foreign object detection sensor 13 has a long string shape. The foreign object detection sensor 13 includes a sensor unit 21 having a long string shape.
As shown in FIG. 3, the long hollow insulator 22 (cylindrical member) constituting the sensor unit 21 is formed of an elastically deformable insulator. The hollow insulator 22 includes a cylindrical inner insulator 22a and an outer insulator 22b that covers the outer periphery of the inner insulator 22a.

  As shown in FIG. 3, the inner insulator 22a has a long string shape and an outer peripheral surface thereof has a cylindrical shape. A hollow hole 22c extending along the longitudinal direction of the inner insulator 22a is formed inside the inner insulator 22a. This hollow hole 22c has a cross section in a direction perpendicular to the longitudinal direction of the inner insulator 22a, with the spacing recesses 22d recessed toward the outer circumference at four locations in the circumferential direction in the cross section perpendicular to the longitudinal direction of the inner insulator 22a. The shape is substantially X-shaped. The hollow hole 22c extends along the longitudinal direction of the inner insulator 22a (same as the longitudinal direction of the hollow insulator 22) so that the four spaced-apart recesses 22d are each spiral. By having the hollow hole 22c in the inner insulator 22a, the hollow insulator 22 has a hollow shape (tubular shape).

  As shown in FIG. 3, inside the inner insulator 22a, two electrode wires 23 and 24 held by the inner insulator 22a are arranged so as to be spaced apart from each other. Each of the electrode wires 23 and 24 includes a flexible central electrode 25 formed by twisting conductive thin wires, and a cylindrical conductive coating layer 26 that has conductivity and elasticity and covers the outer periphery of the central electrode 25. And have. The two electrode lines 23 and 24 are between the four spacing recesses 22d arranged in the circumferential direction inside the inner insulator 22a, and the spacing recess 22d is between the electrode line 23 and the electrode line 24. It is arranged at a position where two are interposed. Further, the two electrode wires 23 and 24 are arranged at equal angular intervals (180 ° intervals in the present embodiment) in the circumferential direction on the inner side of the inner insulator 22a, and are spaced from each other (interval in the circumferential direction). While keeping constant, it extends spirally in the longitudinal direction of the inner insulator 22a along the spacing recess 22d extending spirally. The electrode wires 23 and 24 are held by the inner insulator 22a by being partially embedded in the inner insulator 22a inside the inner insulator 22a. The two electrode wires 23 and 24 are in a direction perpendicular to the longitudinal direction of the inner insulator 22a through the hollow hole 22c at any position in the longitudinal direction of the inner insulator 22a (that is, the diameter of the inner insulator 22a). Direction).

  As shown in FIG. 3, the outer insulator 22b is made of, for example, urethane elastomer, is integrally formed on the outer peripheral surface of the inner insulator 22a, and covers the entire outer peripheral surface of the inner insulator 22a. A band-shaped sticking surface 22 e extending along the longitudinal direction of the hollow insulator 22 is formed on the outer peripheral surface of the outer insulator 22 b, that is, the outer peripheral surface of the hollow insulator 22. The sticking surface 22e is formed from one end to the other end of the hollow insulator 22 in the longitudinal direction. Further, the sticking surface 22 e is linear in a cross section orthogonal to the longitudinal direction of the hollow insulator 22. Further, the outer peripheral surface of the outer insulator 22b has a substantially U-shaped portion that opens to the sticking surface 22e side in a cross section orthogonal to the longitudinal direction of the hollow insulator 22. Such a hollow insulator 22 has a substantially D-shaped cross section perpendicular to the longitudinal direction.

  Here, as shown in FIG. 2, one end in the longitudinal direction of the hollow insulator 22 (the left end in FIG. 2) is defined as a first end 22 f, and the other one end (the right end in FIG. 2). The end portion is defined as the second end portion 22g. The center electrodes 25 of the two electrode wires 23 and 24 are respectively drawn out from the first end 22 f of the hollow insulator 22, and a resistor 28 is electrically connected between the two center electrodes 25. Yes. That is, the two electrode wires 23 and 24 are electrically connected via the resistor 28 on the first end 22 f side of the hollow insulator 22.

  As shown in FIG. 1, a terminal processing unit 31 is provided at the second end 22 g of the hollow insulator 22. As shown in FIGS. 5A and 5B, the terminal processing unit 31 includes a support member 32 disposed adjacent to the second end 22g of the hollow insulator 22, the electrode wires 23, Two power supply members 33 for supplying power to 24 and a sealing member 34 embedded with a support member 32 and the like sealed inside.

  The support member 32 is formed from an insulating resin material. The support member 32 includes a terminal support portion 41 and a spacer 42 formed integrally with the terminal support portion 41.

  The terminal support portion 41 has a rectangular plate shape. The thickness of the terminal support portion 41 (the length in the direction perpendicular to the plane of FIG. 5) is formed thinner than the thickness of the hollow insulator 22. The spacer 42 is integrally formed at an end portion of the terminal support portion 41 adjacent to the second end portion 22g. The spacer 42 protrudes from the center of the end portion of the terminal support portion 41 facing the second end portion 22g of the hollow insulator 22 and has a substantially columnar shape. The spacer 42 has a columnar shape that is thinner than the thickness of the terminal support portion 41, and the diameter of the spacer 42 is substantially equal to the width of the gap between the electrode wires 23 and 24 facing each other inside the hollow insulator 22. . The support member 32 is assembled to the hollow insulator 22 in a state in which the portion on the distal end side of the spacer 42 is inserted into the hollow hole 22c from the second end 22g side of the hollow insulator 22. In the present embodiment, the spacer 42 is inserted into the hollow hole 22c until the end surface of the terminal support 41 that faces the second end 22g of the hollow insulator 22 contacts the second end 22g. The spacer 42 inserted into the hollow hole 22c (inside the hollow insulator 22) from the second end 22g side is interposed between the two electrode wires 23 and 24 at the second end 22g, and the electrode wire 23, The contact of 24 is prevented.

  As shown in FIG. 4, the two power supply members 33 include a terminal 51 and a lead wire 52. A pair of terminals 51 and lead wires 52 are provided (one is shown in FIG. 4). That is, one power supply member 33 includes one terminal 51 and one lead wire 52, and is electrically connected to the electrode wire 23 to supply power to the electrode wire 23. Similarly, the other power supply member 33 includes the other terminal 51 and the other lead wire 52, and is electrically connected to the electrode wire 24 to supply power to the electrode wire 24.

  Each terminal 51 is formed from a conductive metal plate and has a rectangular plate shape that is slightly smaller than the terminal support portion 41. One terminal 51 and one lead wire 52 are electrically connected by solder H1. Similarly, the other terminal 51 and the other lead wire 52 are electrically connected by the solder H1. The one terminal 51 and the one lead wire 52 are insulated from the other terminal 51 and the other lead wire 52 by interposing the terminal support portion 41 therebetween.

  As shown in FIG. 3, the center electrodes 25 of the electrode wires 23 and 24 are drawn from the second end 22g of the hollow insulator 22, respectively. At this time, the terminal support portion 41 is arranged between the two extracted center electrodes 25. The center electrodes 25 are electrically connected to the terminals 51 by, for example, solder H2. The end face of the second end 22g and at least a part of the center electrode 25 are sealed with a UV seal portion S made of, for example, an ultraviolet curable resin.

  The lead wire 52 includes a conductive metal wire 53, a substantially cylindrical outer skin 54 that covers the outside of the metal wire 53 and has an insulating property, and a substantially cylindrical sheath that covers the outer skin 54 and has an insulating property. 55. The outer skin 54 and the sheath 55 are made of the same material as the outer insulator 22 b of the hollow insulator 22. In the present embodiment, as the material, for example, urethane elastomer which is resin can be adopted.

  As shown in FIG. 4, at the tip of the lead wire 52, the sheath 55 and the outer skin 54 are removed, and the metal wire 53 is exposed. And the front-end | tip part of each lead wire 52 is electrically connected with the terminal 51 by the solder H1.

For this reason, the metal wire 53 of each lead wire 52 is electrically connected to the electrode wires 23 and 24 via the terminal 51.
The sealing member 34 is formed of the same material as the outer skin 54, the sheath 55, and the outer insulator 22b (urethane elastomer in this embodiment). As shown in FIG. 5, the sealing member 34 includes a portion of the support member 32 that is disposed outside the hollow insulator 22, a terminal 51, a portion on the distal end side of the lead wire 52, and a second end portion of the hollow insulator 22. 22 g is embedded and sealed inside. The sealing member 34 is formed so as to be adjacent to the second end 22 g of the hollow insulator 22 in the longitudinal direction of the sensor unit 21. The sealing member 34 is integrally formed on the second end 22 g side of the hollow insulator 22 while burying the second end 22 g of the hollow insulator 22. The sealing member 34 embeds and seals the terminal support portion 41 and the two terminals 51 inside. As shown in FIG. 5, the end of the sealing member 34 on the second end 22g side of the hollow insulator 22 is in close contact with the second end 22g in a liquid-tight and air-tight manner. Further, the sealing member 34 seals the terminal support portion 41, the two terminals 51, and the tip side portion of the lead wire 52 in a liquid-tight and air-tight manner.

  Then, the two lead wires 52 extending from the sealing member 34 extend in parallel with the sensor portion 21 toward the first end portion 22 f (right side in FIG. 5), and then are drawn into the door panel 5. Yes. As shown in FIG. 2, one of the two lead wires 52 drawn into the door panel 5 is electrically connected to the energization detection unit 14 inside the door panel 5. Further, of the two lead wires 52, the other lead wire 52 is connected to the ground GND inside the door panel 5 (that is, grounded to the vehicle body 3).

  As shown in FIGS. 1 and 2, the energization detection unit 14 is disposed inside the door panel 5. The energization detection unit 14 supplies current to the electrode wire 23. In a normal state in which an external force such as a pressing force is not applied to the sensor unit 21, the current supplied from the energization detection unit 14 to the electrode wire 23 flows to the electrode wire 24 through the resistor 28. On the other hand, when an external force that crushes the sensor unit 21 is applied, the hollow insulator 22 in the portion where the external force is applied is elastically deformed, and the electrode wires 23 and 24 are bent along with the elastic deformation of the hollow insulator 22. Then, the electrode wire 23 and the electrode wire 24 come into contact with each other and are short-circuited. Then, the current supplied from the energization detection unit 14 to the electrode wire 23 flows to the electrode wire 24 without passing through the resistor 28. Therefore, for example, when a current is supplied to the electrode wire 23 at a constant voltage, the current value changes. Therefore, the energization detection unit 14 detects the change in the current value at this time, thereby detecting the sensor unit. The foreign matter that has come into contact with 21 is detected. And when the electricity supply detection part 14 detects the change of this electric current value, ie, detects the foreign material which contacted the foreign material detection sensor 13, it will output a foreign material detection signal to the door ECU61 mentioned later. In addition, when the external force with respect to the sensor part 21 is removed, the hollow insulator 22 will be restored, and the electrode wires 23 and 24 will also be restored and become non-conductive.

  The electric back door device 2 includes a door ECU 61 that controls the opening / closing operation of the door panel 5 by the actuator 6 inside the door panel 5. The door ECU 61 includes a ROM (Read only Memory), a RAM (Random access Memory), and the like, has a function as a microcomputer, and is supplied with power from a battery (not shown) of the vehicle 1. The door ECU 61 supplies a current to the energization detection unit 14 that is electrically connected to the door ECU 61. The door ECU 61 controls the actuator 6 based on various signals input from the operation switch 9, the position detection device 8, the energization detection unit 14, and the like.

Next, the operation of the electric back door device 2 configured as described above will be comprehensively described.
When an open signal is input from the operation switch 9, the door ECU 61 drives the actuator 6 to open the door panel 5. The door ECU 61 recognizes the rotational position of the door panel 5 based on the position detection signal input from the position detection device 8. In the present embodiment, the door ECU 61 counts the number of pulses of the position detection signal, and recognizes the rotational position of the door panel 5 based on the count value. When the door panel 5 is disposed at the fully closed position, the door ECU 61 stops the actuator 6.

  On the other hand, when a close signal is input from the operation switch 9, the door ECU 61 drives the actuator 6 to close the door panel 5. When the door panel 5 is disposed at the fully closed position, the door ECU 61 stops the actuator 6. In addition, when the foreign matter comes into contact with the sensor portion 21 of the foreign matter detection sensor 13 and an external force is applied to the sensor portion 21 during the closing operation of the door panel 5, the hollow insulator 22 is elastically deformed in the foreign matter detection sensor 13. As a result, the electrode wire 23 and the electrode wire 24 come into contact with each other and are short-circuited. As a result, since the current value of the current supplied to the electrode wire 23 changes, the energization detection unit 14 outputs a foreign object detection signal to the door ECU 61. When the foreign object detection signal is input, the door ECU 61 reverses the actuator 6 to open the door panel 5 by a predetermined amount and then stops the actuator 6.

Next, the operation of this embodiment will be described.
In the foreign matter detection sensor 13 of the present embodiment, the second end 22g of the hollow insulator 22 is composed of the same material (urethane elastomer) as the sealing member 34, the outer skin 54, the sheath 55, and the outer insulator 22b. . For this reason, when the sealing member 34 that is in a fluid state is poured into the mold with the second end 22g of the hollow insulator 22 placed in the mold, at least the surfaces of the outer skin 54, the sheath 55, and the outer insulator 22b are dissolved. To do. As a result, the outer insulator 22b, the outer skin 54, and the sheath 55 are welded to the sealing member 34 to ensure water tightness, and a decrease in waterproof performance is suppressed.

Next, the effect of this embodiment will be described.
(1) Since the outer insulator 22b, the outer skin 54, and the sheath 55 are melted at the temperature in the resin flow state of the sealing member 34, the outer insulator 22b, the outer skin 54, and the sheath 55 are welded to the sealing member 34. In addition, water tightness is ensured and deterioration of waterproof performance can be suppressed.

(2) Since the outer insulator 22b, the outer skin 54, and the sheath 55 are made of the same material, it is easy to manage the temperature of the resin of the sealing member 34 for molding them.
(3) Since the outer insulator 22b, the outer skin 54 and the sheath 55, and the resin of the sealing member 34 are made of the same material, the outer insulator 22b, the outer skin 54 and the sheath 55 are extremely dissolved. Can be suppressed.

In addition, you may change the said embodiment as follows.
In the above-described embodiment, the insulating portion of the lead wire 52 is configured by the outer skin 54 and the sheath 55, but is not limited thereto.

  For example, as shown in FIG. 5, the insulating portion may be configured only by the outer skin 54. In this case, the sealing member 34 (resin) needs to be made of a material that dissolves the outer insulator 22b and the outer skin 54 at a temperature in a fluid state.

In the above-described embodiment, urethane elastomer is used as an example of the material of the outer skin 54, the sheath 55, the outer insulator 22b, and the sealing member 34 of the lead wire 52, but is not limited thereto.
In the above-described embodiment, the outer skin 54 and the sheath 55 of the lead wire 52 are made of the same material as the outer insulator 22b as a cylindrical part. However, for example, the outer sheath 54 of the lead wire 52 and the outer insulator 22b are the same. The sheath 55 may be made of a material of the system, and the material of the sheath 55 may be different from that of the outer skin 54 and the outer insulator 22b. However, the sealing member 34 (resin) needs to be made of a material that dissolves the outer insulator 22b and the sheath 55 at a temperature in a fluid state.

Further, the sheath 55 of the lead wire 52 and the outer insulator 22b may be made of the same material, and the material of the outer skin 54 may be different from that of the sheath 55 and the outer insulator 22b.
-In above-mentioned embodiment, although the insulator 22 as a cylindrical part was comprised by the inner side insulator 22a and the outer side insulator 22b, you may employ | adopt the structure which integrated these. Further, the inner insulator 22a and the outer insulator 22b may not be the same material. It suffices that at least the outer peripheral portion of the insulator 22 is a material that melts at the temperature in the flow state of the sealing member 34 (resin).

  In the above embodiment, the outer insulator 22b and the sealing member 34 are formed of the same material, but not limited to this, the inner insulator 22a and the sealing member 34 are formed of the same material, The form which ensures the watertightness of the inner side insulator 22a and the sealing member 34 may be sufficient.

-You may combine the said embodiment and said each modification suitably.
Next, a technical idea that can be grasped from the above embodiment and another example will be added below.
The cylindrical portion includes an inner cylindrical portion that accommodates a plurality of electrode wires therein, and an outer cylindrical portion that covers an outer periphery of the inner cylindrical portion, and the insulating portion is the outer cylindrical portion. And at least the same material.

  In this way, even when the cylindrical portion is composed of a plurality of members, by making the outer cylindrical portion the same as the insulating portion, the sealing portion melts at the temperature in the resin flow state, so that water tightness is ensured. A decrease in waterproof performance can be suppressed.

-The insulating part is characterized in that at least the outer peripheral part is made of the same material as the cylindrical part.
In this way, since at least the outer peripheral portion of the insulating portion is made of the same material as that of the cylindrical portion, the sealing portion dissolves at the temperature in the resin flow state, so that water tightness is ensured and deterioration of waterproof performance is suppressed. Can do.

  The foreign object detection sensor includes a long hollow cylindrical portion and a long sensor portion having a plurality of electrode wires arranged apart from each other inside the cylindrical portion, and a longitudinal direction of the cylindrical portion. A lead wire for supplying electric power to the electrode wire drawn out from the end portion, the end portion of the cylindrical portion, the end portion of the electrode wire, and the end portion of the lead wire are molded with resin. The cylindrical portion is a foreign matter detection sensor made of a material that melts at a temperature in which the resin flows, and the end surface of the cylindrical portion and the end of the electrode wire are It is sealed by a second seal portion made of a resin different from the resin of the seal portion, and the seal portion includes an end portion of the cylindrical portion, the second seal portion, an end portion of the electrode wire, And the resin including the end of the lead wire is molded with resin, The portion has an inner cylindrical portion that accommodates a plurality of electrode wires therein, and an outer cylindrical portion that covers the outer periphery of the inner cylindrical portion, and the outer cylindrical portion has a resin flow of the seal portion flowing therethrough. The inner cylindrical portion is made of a material different from the outer cylindrical portion, and the end surface of the outer cylindrical portion and the end surface of the inner cylindrical portion are The second seal portion is sealed.

According to this configuration, since the cylindrical portion is melted at the temperature in the resin flow state, the cylindrical portion and the seal portion (resin) are welded, water tightness is ensured, and deterioration in waterproof performance can be suppressed.
In the foreign matter detection sensor, the cylindrical portion is made of the same material as the resin of the seal portion.

According to this configuration, since the cylindrical portion and the resin of the seal portion are made of the same material, it is possible to suppress the extreme dissolution of the cylindrical portion.
In the foreign matter detection sensor, the lead wire has a conductor wire and an insulating portion that covers the conductor wire, and the seal portion is molded with a resin including an end portion of the conductor wire and the insulating portion, The cylindrical portion and the insulating portion are made of a material that melts the resin of the seal portion at a temperature in a fluid state.

  According to this configuration, since the tubular portion and the insulating portion are melted at the temperature in the resin flow state, the tubular portion and the insulating portion are welded to the seal portion (resin), water tightness is ensured, and the waterproof performance is lowered. Can be suppressed.

In the foreign matter detection sensor, the cylindrical portion and the insulating portion are made of the same material.
According to this configuration, since the cylindrical portion and the insulating portion are made of the same material, it is easy to manage the temperature of the resin in the seal portion for molding them.

In the foreign matter detection sensor, the cylindrical portion and the insulating portion are made of the same material as the resin of the seal portion.
According to this configuration, since the cylindrical portion, the insulating portion, and the resin of the seal portion are made of the same material, it is possible to suppress the extreme melting of the cylindrical portion and the insulating portion.

DESCRIPTION OF SYMBOLS 13 ... Foreign matter detection sensor, 21 ... Sensor part, 22b ... Outer insulator (cylindrical part), 23, 24 ... Electrode wire, 34 ... Sealing member (sealing part), 52 ... Lead wire, 53 ... Metal wire (conductor) Wire), 54 ... outer skin (insulating part), 55 ... sheath (insulating part).

Claims (3)

An elongated sensor part having a long hollow cylindrical part and a plurality of electrode wires arranged apart from each other inside the cylindrical part;
A lead wire for supplying electric power to the electrode wire drawn out from the longitudinal end portion of the tubular portion;
An end portion of the cylindrical portion, an end portion of the electrode wire, and a seal portion molded with resin including an end portion of the lead wire,
The lead wire has a conductor wire and an insulating portion covering the conductor wire,
The seal portion is molded with resin including the end portion of the conductor wire and the insulating portion,
The cylindrical portion and the insulating portion are made of a material that melts at a temperature in which the resin flows.
The length of the portion molded by the seal portion in the longitudinal direction of the insulating portion is longer than the length of the portion molded by the seal portion in the longitudinal direction of the tubular portion,
The insulating portion has an outer skin that covers the outer side of the conductor wire, and a sheath that covers the outer side of the outer skin,
The part of the insulating part molded by the seal part includes a part in which the outer side of the outer skin is molded by the seal part, and a part in which the outer side of the sheath is molded by the seal part. . The sensor unit and the lead wire are in parallel,
2. The foreign matter detection sensor according to claim 1, wherein the seal portion has a length in a longitudinal direction of a portion in which the lead wire is molded longer than a length in a longitudinal direction of a portion in which the sensor portion is molded. The foreign matter detection sensor according to claim 1, wherein the cylindrical portion and the insulating portion are made of a material of the same system as the resin.