JP2018112475A - Electrode unit and detection probe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve miniaturization and increase in assembling efficiency.SOLUTION: An electrode unit comprises: a rod-like detection electrode 22 that detects an amount to be detected of a detection object, and is connected to an external device via a core wire 26a of a shield cable 26; a cylindrical first shield 23 that covers the detection electrode while the first shield is insulated with respect to the detection electrode 22; and an electric conductive supporting section 21 that supports respective base end parts 22r and 23r of the detection electrode 22 and of the first shield 23. The supporting section 21 comprises: a columnar section 21a that has a through-hole Ha formed at a center part, and has a braided shield 26c of a shield cable 26 connected to an outer circumferential surface C; and a flange 21b in which a center hole Hb communicating with the through-hole Ha is formed. The detection electrode 22 is supported by the supporting section 21 with the base end part 22r inserted into the center hole Hb and through-hole Ha while the detection electrode is insulated with respect to the supporting section 21, and the first shield 23 is supported by the supporting section 21 while the base end part 23r is connected to the flange 21b.SELECTED DRAWING: Figure 11

Description

  The present invention relates to an electrode unit that detects a detection amount of a detection target in a metal non-contact manner, and a detection probe including the electrode unit.

  As this type of voltage detection probe, the applicant of the present application discloses various types of voltage detection probes (hereinafter also simply referred to as “detection probes”) in Patent Documents 1 to 3 below. For example, Patent Document 1 discloses a detection probe including a clamp portion that incorporates a magnetic core that surrounds an electric wire in a closed state to form an annular closed magnetic path. Further, in Patent Document 2, a sensor substrate housing portion that houses a voltage measurement sensor substrate and a sensor substrate housing portion that is pivotally supported by a sensor substrate housing portion via a rotation shaft so that an electric wire is connected to the sensor substrate housing portion. The detection probe of the structure provided with the pressing part clamped by is disclosed. Moreover, in patent document 3, it has the voltage detection part by which the detection electrode for voltage detection and a magnet are arrange | positioned inside, and it positions on the electric wire, positioning the front-end | tip part of the measurement probe provided with the voltage detection part with the magnetic force of a magnet. A detection probe configured to be pressed is disclosed. Each of these detection probes is a detection probe (metal non-contact type voltage detection) that can detect the voltage of the conductive part by simply capacitively coupling the detection electrodes without directly contacting the conductive part of the electric wire. Probe).

  On the other hand, in each detection probe described above, a configuration in which a magnetic core is disposed in the vicinity of the voltage detection electrode, a mechanism for clamping or clamping is disposed, or a magnet is disposed, The tip end portion for clamping and clamping the electric wire is large. Therefore, in each of the detection probes described above, for example, when a plurality of electric wires are arranged close to each other, it may be difficult to clamp or clamp one of the electric wires.

  As a configuration capable of improving such a problem, the inventor has already developed the detection probe 201 shown in FIG. The detection probe 201 includes a rod-shaped detection electrode 202 and a cylindrical shield 203 that is disposed outside the detection electrode 202 and is slidable in the axial direction with respect to the detection electrode 202. Further, a notch 203a is formed at the tip of the shield 203, and the tip of the detection electrode 202 is moved by sliding the shield 203 toward the end of the detection electrode 202 with the electric wire inserted into the notch 203a. The electric wire is held between the shield 203 and the detection electrode 202 in contact with the electric wire. At this time, the detection electrode 202 and the core of the electric wire are capacitively coupled via the insulating layer of the electric wire, and the detection electrode 202 detects the voltage of the electric wire. In this detection probe 201, as shown in the figure, since the tip side portion is configured to be small, even when a plurality of electric wires are arranged close to each other, one of the electric wires can be easily formed. It is possible to be held between.

Japanese Unexamined Patent Publication No. 2012-137496 (5th page, FIG. 1) JP 2014-52329 A (page 5-8, FIG. 1-3) JP 2014-163670 A (page 5-8, Fig. 1-3)

  However, the detection probe 201 already developed by the inventors also has the following problems to be improved. Specifically, in the detection probe 201 described above, as shown in FIG. 15, a substrate 205 is disposed in a case 204, and the detection electrode 202 is connected to the substrate 205 via a lead wire soldered to the substrate 205. ing. The shield 203 is connected to the substrate 205 via a conductive wire soldered to the substrate 205 and a conductive member to which the conductive wire is connected. Further, the core wire 300a and the braided shield 300b of the shield cable 300 for outputting a detection signal about the voltage detected by the detection electrode 202 to the external device are connected to the substrate 205 by soldering. That is, in this detection probe 201, the detection electrode 202 and the shield cable 300 are connected via the substrate 205. For this reason, it is difficult to reduce the size of the detection probe 201 because the space for disposing the substrate 205 is necessary. Further, in this detection probe 201, since it is necessary to connect the detection electrode 202, the shield 203, the core wire 300a, and the braided shield 300b to the substrate 205 by soldering via a conductive wire or a conductive member, it is difficult to improve the assembly efficiency. It has become. In this case, instead of the substrate 205, a connector (for example, a BNC receptacle) connected to the detection electrode 202 and the shield 203 is provided on the detection probe 201, and a connector (for example, a BNC plug) is connected to the shield cable 300, and both connectors are connected. The structure which performs is considered. However, since this type of connector is relatively large, it is difficult to reduce the size sufficiently even in this configuration.

  The present invention has been made to solve such a problem, and a main object of the present invention is to provide an electrode unit and a detection probe that can realize downsizing and improvement in assembly efficiency.

  In order to achieve the above object, the electrode unit according to claim 1 is configured to detect the detected amount of the detection target without contact with the metal in a state where the tip portion is close to the detection target and to connect the external device via the core wire of the shielded cable. An electrode unit including a rod-shaped detection electrode connected to the cylindrical first shield covering the detection electrode in a state of being insulated from the detection electrode, and the detection electrode and the first shield A support portion having conductivity that supports each base end portion, and the support portion includes a columnar portion in which a through hole is formed in a central portion and a shield conductor of the shield cable is connected to an outer peripheral surface; A flange provided at a distal end portion of a columnar portion and formed with a central hole communicating with the through hole, and the detection electrode is insulated from the support portion and the base end portion is the center And the inserted into the through-hole is supported by the support unit, the first shield, the base end portion is supported by the support portion in a state of being connected to the flange.

  The electrode unit according to claim 2 is the electrode unit according to claim 1, wherein the outer peripheral surface of the columnar portion is subjected to anti-slip processing.

  The electrode unit according to claim 3 is the electrode unit according to claim 1 or 2, wherein the shield cable is connected to the core wire and the detection electrode of the shield cable, and the shield conductor and the columnar portion of the shield cable. A connecting portion for connecting, and the connecting portion includes a conductive socket and a connecting tube, and the socket includes a tip end of the core wire inserted from each end side of the socket and the detection The connection end of the electrode is connected to the base end of the electrode, and the connection tube is crimped in a state where the shield conductor is disposed on the outer peripheral surface of the columnar portion and is inserted into the connection tube. Connect the shield conductor.

  According to a fourth aspect of the present invention, in the electrode unit according to the third aspect, the socket has a claw portion that protrudes inward and prevents the detection electrode from coming off.

  A detection probe according to claim 5 is disposed outside the first shield so as to be slidable with respect to the first shield of the electrode unit according to any of claims 1 to 4 and the electrode unit. A second shield that is connected to the first shield and has a notch for inserting the detection target formed at a tip thereof, and the base of the first shield in a state where the detection target is inserted into the notch. When the second shield slides in the first direction toward the end side, the tip end portion of the detection electrode is configured to be close to the detection target.

  A detection probe according to a sixth aspect is the detection probe according to the fifth aspect, wherein a cylindrical third shield that covers the base end side of the first shield and the base end side of the second shield, 3 and a biasing portion that biases the second shield in the first direction, and the third shield is connected to the flange in a state where the flange is fitted to the base end portion. Has been.

  The electrode unit according to claim 1, further comprising a detection electrode, a first shield, and a support portion that supports each base end portion of the detection electrode and the first shield, and a columnar portion and a center hole in which a through hole is formed. The support portion is configured to include the formed flange, and the detection electrode is supported by the support portion by being inserted into the center hole and the through hole in a state where the base end portion is insulated from the support portion, and the base end portion is The 1st shield is supported by the support part in the state connected to the flange. By configuring the electrode unit in this way, for example, by inserting the core wire of the shielded cable into the through hole, the detection electrode and the core wire can be connected without using a connection board or the like. The first shield and the shield conductor connected to the columnar portion (support portion) by covering (fixing) and fixing the columnar portion with the shield conductor through the columnar portion without using a connecting substrate or the like Can be connected. For this reason, according to this electrode unit, compared with the structure which provides the board | substrate for connecting these, and the structure which connects these using a connector, an electrode unit can fully be reduced in size. Moreover, according to this electrode unit, the complicated operation | work which solders a detection electrode, a 1st shield, the core wire of a shield cable, and the shield conductor of a shield cable to a board | substrate via a conducting wire or an electroconductive member can be skipped. Therefore, the assembly efficiency can be sufficiently improved.

  Further, according to the electrode unit of the second aspect, since the outer peripheral surface of the columnar portion of the support portion is subjected to anti-slip processing, for example, the shield conductor of the shield cable arranged so as to cover the outer peripheral surface is provided on the outer peripheral surface. When connecting and fixing, slipping of the shield conductor can be restricted, so that the working efficiency can be sufficiently increased and the shield conductor can be reliably fixed to the outer peripheral surface.

  According to a third aspect of the present invention, the connection unit is configured to include a conductive socket and a connection tube. Therefore, according to this electrode unit, the detection electrode and the core wire can be easily connected by simply inserting the base end portion of the detection electrode into the other end portion of the socket in which the core wire of the shield cable is inserted into one end portion. can do. In addition, the first tube and the shield conductor connected to the columnar part are attached by attaching a connection tube around the columnar part and the shield conductor, which are covered with the shield conductor of the shield cable, and crushing and crimping the connection tube. Can be easily connected. For this reason, according to this electrode unit, the work efficiency of the operation | work which connects these can fully be improved.

  According to the electrode unit of the fourth aspect, since the claw portion protruding inward is formed in the socket, the detection electrode can be securely removed from the socket only by inserting the base end portion of the detection electrode into the socket. Can be prevented.

  According to the detection probe of the fifth aspect of the present invention, the second shield is disposed outside the first shield so as to be slidable with respect to the first shield, and has a notch for inserting a detection target at the tip. By sliding the second shield in the first direction toward the base end side of the first shield with the detection target inserted in the notch, the detection electrode and the edge of the notch Thus, it is possible to detect the detected amount by holding the detection target and bringing the tip of the detection electrode close to the detection target. For this reason, according to this detection probe, for example, even when a plurality of electric wires are arranged close to each other, the tip of the detection probe (the detection electrode, the first shield, the second shield, etc.) ) Can be inserted and only one electric wire as each detection target can be easily sandwiched, and even in such a case, the detected amount for the detection target can be reliably detected. Further, according to this detection probe, since the detection electrode can be shielded by the first shield and the second shield by covering the first shield with the second shield, the influence of the disturbance on the detection electrode is further reduced. It can be kept low.

  According to the detection probe of the sixth aspect, since the third shield covering the base end side of the first shield and the base end side of the second shield is provided, the first shield, the second shield, and the second shield Since the detection electrode can be shielded by three of the three shields, the influence of disturbance on the detection electrode can be further suppressed. Further, according to this detection probe, since the urging portion for urging the second shield in the first direction toward the proximal end portion side of the first shield is provided, the detection electrode and the edge portion of the notch are provided. Since the state where the detection target is sandwiched can be maintained by the urging force of the urging unit, workability can be sufficiently improved.

2 is a perspective view showing a configuration of a detection probe 1. FIG. 1 is a front view of a detection probe 1. FIG. 2 is an exploded perspective view of a detection probe 1. FIG. FIG. 3 is a perspective view showing configurations of an electrode unit 2 and a shield unit 3. 3 is a perspective view of an electrode unit 2. FIG. 3 is a front view of an electrode unit 2. FIG. It is a perspective view which shows the structure of the electrode side part 2a. It is sectional drawing which shows the structure of the electrode side part 2a. It is a disassembled perspective view of the electrode side part 2a. It is a disassembled perspective view of the cable side part 2b. 2 is a cross-sectional view of an electrode unit 2. FIG. 3 is a cross-sectional view of a socket 27. FIG. FIG. 3 is a first explanatory diagram explaining how to use the detection probe 1. It is the 2nd explanatory view explaining how to use detection probe. It is a front view which shows the structure of the conventional detection probe 201 (a part of case 204 is removed).

  Hereinafter, embodiments of an electrode unit and a detection probe will be described with reference to the accompanying drawings.

  First, the configuration of the detection probe 1 shown in FIG. 1 as an example of the detection probe will be described. The detection probe 1 is configured to be able to detect the amount to be detected of a detection target in a metal non-contact manner (in a state where the detection target 1 does not contact a metal portion of the detection target). Specifically, as shown in FIGS. 1 to 3, the detection probe 1 includes an electrode unit 2, a shield unit 3, and a grip part 4.

  As shown in FIGS. 4 to 6, the electrode unit 2 is composed of an electrode side part 2a and a cable side part 2b, and the electrode side part 2a and the cable side part 2b are connected by a connection method described in an assembly method described later. Has been. In the following description, “connection” simply means “electrical connection”.

  As shown in FIGS. 7 to 9, the electrode side part 2 a includes a support portion 21, a detection electrode 22, a first shield 23, an insulating tube 24, and an insulating bush 25.

  As shown in FIGS. 7 and 8, the support portion 21 includes a columnar portion 21 a and a flange 21 b that are integrally formed of a conductive material such as metal, and supports the detection electrode 22 and the first shield 23. To do. In this case, the columnar portion 21a is formed in a cylindrical shape as shown in FIG. 7, and a through hole Ha into which the base end portion 22r of the detection electrode 22 and the insulating bush 25 can be inserted as shown in FIG. It is formed at the center. Further, as shown in FIG. 7, the outer peripheral surface C of the columnar portion 21a is subjected to anti-slip processing such as knurling, and a braided shield (shield conductor) 26c of the shield cable 26 is provided on the outer peripheral surface C. It connects by the connection method demonstrated in the assembly method mentioned later (refer FIG. 11). Further, as shown in FIG. 8, the flange 21b is formed in a disc shape (columnar shape) and is provided at the tip end portion 21t of the columnar portion 21a. Further, as shown in the figure, the flange 21b is formed with a central hole Hb through which the base end portion 22r of the detection electrode 22 and the insulating bush 25 can be inserted in communication with the through hole Ha of the columnar portion 21a. .

  As shown in FIGS. 8 and 9, the detection electrode 22 is formed in a rod shape, and detects the detected amount of the detection target in a non-contact manner with the tip 22t in proximity to the detection target. Further, the detection electrode 22 has a base end portion 22r connected to a core wire 26a of a shielded cable 26 described later, and is connected to an external device via the core wire 26a. The detection electrode 22 is insulated from the support portion 21 and supported by the support portion 21 in a state where the base end portion 22r is inserted into the center hole Hb and the through hole Ha.

  As shown in FIGS. 8 and 9, the first shield 23 is formed in a cylindrical shape (an example of a cylindrical shape) from a conductive material such as metal and is insulated from the detection electrode 22. 22 is covered. In this case, the first shield 23 is connected to a reference potential via a braided shield 26 c of a shield cable 26 described later connected to the support portion 21, and functions as a shield that reduces the influence of disturbance on the detection electrode 22. Further, as shown in FIG. 8, the first shield 23 is supported by the support portion 21 in a state where the base end portion 23 r is connected to the flange 21 b of the support portion 21.

  As an example, the insulating tube 24 is a heat-shrinkable tube that shrinks by heating, and as shown in FIGS. 8 and 9, is formed in a cylindrical shape from a non-conductive material. As shown in FIG. 8, the insulating tube 24 is disposed between the detection electrode 22 and the first shield 23 to insulate the detection electrode 22 and the first shield 23.

  As shown in FIGS. 8 and 9, the insulating bush 25 is formed in a cylindrical shape from a non-conductive material such as resin. As shown in FIG. 8, the insulating bush 25 is inserted between each inner peripheral surface of the through hole Ha of the columnar part 21 a and the center hole Hb of the flange 21 b and the base end part 22 r of the detection electrode 22. Thus, the movement of the detection electrode 22 is restricted while the detection electrode 22 and the support portion 21 are insulated.

  As shown in FIG. 10, the cable-side part 2 b includes a shield cable 26, a socket 27, insulating tubes 28 and 29, and a connection tube 30. In this case, the socket 27 and the connection tube 30 constitute a connection part.

  As shown in FIG. 11, the shielded cable 26 includes a core wire 26a, an insulating layer 26b, a braided shield (shield conductor) 26c, and a coating 26d, and these are laminated concentrically. .

  As shown in FIG. 10, the socket 27 is formed in a cylindrical shape with a conductive material such as metal. As shown in FIG. 11, the socket 27 is detected by the distal end portion 26at of the core wire 26a in the shield cable 26 inserted from the proximal end portion 27r of the socket 27 and the detection in the electrode unit 2 inserted from the distal end portion 27t of the socket 27. The base end 22r of the electrode 22 is connected. Further, as shown in FIG. 12, a claw portion 27a protruding inward is formed at the tip portion 27t of the socket 27, and the detection electrode 22 inserted into the socket 27 is engaged with the claw portion 27a. As a result, it is possible to prevent the detection electrode 22 from coming off from the socket 27.

  As an example, the insulating tube 28 is a heat-shrinkable tube that shrinks by heating, and as shown in FIG. 10, the insulating tube 28 is formed in a cylindrical shape from a non-conductive material such as a resin. As shown in FIG. 11, the insulating tube 28 covers the socket 27 connecting the base end portion 22r of the detection electrode 22 and the tip end portion 26at of the core wire 26a and the tip end portion 26bt of the insulating layer 26b of the shield cable 26. The socket 27 and the support portion 21 are insulated from each other.

  As an example, the insulating tube 29 is a heat-shrinkable tube that shrinks by heating, and as shown in FIG. 10, the insulating tube 29 is formed in a cylindrical shape from a non-conductive material such as a resin. As shown in FIG. 11, the insulating tube 29 is disposed so as to cover the distal end portion 26 t of the shield cable 26 and has a function of improving the adhesion between the connection tube 30 and the shield cable 26.

  As shown in FIG. 10, the connection tube 30 is formed in a cylindrical shape from a conductive material such as metal. As shown in FIG. 11, the connection tube 30 is a columnar portion inserted into the connection tube 30 in a state where the braided shield 26c drawn from the shield cable 26 is disposed on the outer peripheral surface C (covers the outer peripheral surface C). 21a and the braided shield 26c have a function of connecting by crimping the connecting tube 30 by crushing.

  As shown in FIGS. 3 and 4, the shield unit 3 includes a second shield 31, a shield cap 32, a collar 33, a pin 34, a shield cover 35, a spring 36, and a third shield 37.

  As shown in FIG. 4, the second shield 31 is formed in a cylindrical shape with a conductive material such as metal, and the tip 31 t is closed by a shield cap 32. In addition, a notch 31 a for inserting a detection target is formed at the tip 31 t of the second shield 31. The second shield 31 is disposed outside the first shield 23 so as to be slidable (in the length direction of the first shield 23) with respect to the first shield 23, and the detection electrode together with the first shield 23. 22 has a function of shielding. In this case, as shown in FIG. 14, the first object heading toward the base end portion 23 r of the first shield 23 with the detection target (for example, the core wire 101 of the electric wire 100 shown in the figure) inserted in the notch 31 a. When the second shield 31 slides in the direction (the direction of the arrow A shown in the figure), the detection target is moved in the first direction by the edge of the notch 31a, and the tip 22t of the detection electrode 22 is detected. The detection target is sandwiched between the tip 22t and the edge of the notch 31a in proximity to the target.

  As shown in FIG. 4, the collar 33 is formed in a cylindrical shape with a conductive material such as metal and is attached to the proximal end portion 31 r of the second shield 31. The pin 34 is attached to the collar 33 as shown in FIG.

  The shield cover 35 is formed of a non-conductive material such as resin and has a function of preventing electric shock by covering the periphery of the second shield 31.

  The spring 36 is an example of an urging portion, and is housed in the third shield 37 as shown in FIGS. 3 and 4, and the second shield in the first direction (the direction of arrow A shown in FIG. 14). 31 (the collar 33 attached to the second shield 31) is energized.

  As shown in FIG. 4, the third shield 37 is formed in a cylindrical shape with a conductive material such as metal. A cap 37 a having a hole (not shown) through which the second shield 31 is inserted is attached to the distal end portion 37 t of the third shield 37. The third shield 37 includes a base end portion side of the electrode side part 2a (a base end portion 22r side of the detection electrode 22 and a base end portion 23r side of the first shield 23), and a base end portion 31r of the second shield 31. The detection electrode 22 is shielded together with the first shield 23 and the second shield 31. A slit 37 b for projecting the pin 34 is formed on the base end 37 r side of the third shield 37. Further, the third shield 37 has an inner diameter slightly larger than the outer diameter of the distal end portion of the flange 21 b in the support portion 21 of the electrode unit 2, and the distal end portion of the flange 21 b is the proximal end portion 37 r of the third shield 37. It is comprised so that it may connect with the flange 21b in the state inserted in (inserted).

  As shown in FIG. 3, the grip part 4 includes cases 41 and 42, a front cap 43, a rear cap 44, a sleeve 45, and a slider 46, and is configured to accommodate the electrode unit 2 and the shield unit 3. The slider 46 is attached to the pin 34 and is slidable along openings formed in the cases 41 and 42.

  Next, a method for assembling the electrode unit 2 and the detection probe 1 will be described.

  First, the electrode unit 2 is assembled. Specifically, as shown in FIG. 8, the base end portion 23r of the first shield 23 is inserted into the center hole Hb of the flange 21b of the support portion 21 and fixed by soldering. Next, the base end portion 22r of the detection electrode 22 is inserted into the insulating bush 25. Subsequently, the detection electrode 22 and the insulating bush 25 are inserted into the insulating tube 24, and then the insulating tube 24 is heated and thermally contracted to adhere.

  Subsequently, the detection electrode 22, the insulating bush 25, and the insulating tube 24 are inserted from the distal end portion 23 t side of the first shield 23. At this time, as shown in FIG. 8, the insulating bush 25 fills the gaps between the inner peripheral surfaces of the center hole Hb of the flange 21b and the through hole Ha of the columnar part 21a and the base end part 22r of the detection electrode 22. Thus, the detection electrode 22 is insulated from the support portion 21 and the movement of the detection electrode 22 is restricted.

  Next, the coating 26d at the tip of the shield cable 26 is peeled off to expose the braided shield 26c, and the tip 26bt of the insulating layer 26b is removed to expose the core wire 26a (see FIG. 11).

  Subsequently, as shown in FIG. 11, the distal end portion 26at of the core wire 26a is inserted into the proximal end portion 27r of the socket 27, and then the proximal end portion 27r of the socket 27 and the distal end portion 26at of the core wire 26a are soldered or crimped. Connect by (caulking). Subsequently, the insulating layer 26b and the socket 27 are inserted into the insulating tube 28 so as to cover the distal end portion 26bt of the insulating layer 26b and the base end portion 27r side of the socket 27 in the shielded cable 26, and then the insulating tube 28 is heated to heat. Shrink and adhere.

  Subsequently, as shown in FIG. 11, the braided shield 26 c is pulled out from the shielded cable 26, and then the distal end portion 26 dt of the coating 26 d in the shielded cable 26 and the boundary portion between the distal end portion 26 dt and the braided shield 26 c are insulated tubes 29. The shielded cable 26 is inserted into the insulating tube 29 so as to be covered, and then the insulating tube 29 is heated and thermally contracted to adhere.

  Next, as shown in FIG. 11, the distal end portion 27 t of the socket 27 is inserted into the through hole Ha of the columnar portion 21 a in the support portion 21 while the proximal end portion 22 r of the detection electrode 22 is inserted into the distal end portion 27 t of the socket 27. . At this time, the claw portion 27 a formed at the tip portion 27 t of the socket 27 engages with the detection electrode 22 inserted into the socket 27. For this reason, the detection electrode 22 is prevented from coming off from the socket 27 with certainty. In the electrode unit 2, as described above, the detection electrode 22 and the core wire 26 a of the shield cable 26 can be reliably connected by a simple operation using the socket 27.

  Subsequently, as shown in FIG. 11, the outer peripheral surface C of the columnar portion 21a is covered with the tip portion 26ct of the braided shield 26c drawn from the shield cable 26 (the braided shield 26c is wound around the columnar portion 21a). Next, the connection tube 30 is mounted around the columnar portion 21 a and the braided shield 26 c and the distal end portion 26 t of the shield cable 26 covered with the insulating tube 29. Subsequently, the connecting tube 30 is crushed and crimped (caulked). Thereby, the columnar part 21a and the braided shield 26c are reliably connected. In the electrode unit 2, as described above, the first shield 23 connected to the columnar portion 21 a (support portion 21) and the braided shield 26 c of the shield cable 26 are securely connected by a simple operation using the connection tube 30. It is possible to connect. Thus, the assembly of the electrode unit 2 is completed.

  In this case, in the electrode unit 2, as described above, the detection electrode 22 and the core wire 26a of the shield cable 26 are connected without using a substrate, and the first shield 23 and the braided shield 26c of the shield cable 26 are connected to the substrate. Therefore, the electrode unit 2 can be downsized as much as the substrate can be omitted compared to the conventional configuration in which a substrate for connecting them is provided. Moreover, in this electrode unit 2, the complicated operation | work which solders the detection electrode 22, the 1st shield 23, the core wire 26a of the shield cable 26, and the braided shield 26c of the shield cable 26 to a board | substrate via a conducting wire or an electroconductive member is abbreviate | omitted. Therefore, it is possible to improve the assembly efficiency.

  Next, the shield unit 3 is assembled to the electrode unit 2. Specifically, as shown in FIG. 4, a shield cap 32 is attached to the tip 31t of the second shield 31 to close the tip 31t. Subsequently, the collar 33 is attached to the proximal end portion 31 r of the second shield 31. Next, the pin 34 is attached to the collar 33. Subsequently, the shield cover 35 is attached to the second shield 31 so as to cover the second shield 31. Next, the tip side (detection electrode 22, first shield 23 and insulating tube 24) of the electrode side part 2 a of the electrode unit 2 is inserted into the collar 33 and the second shield 31. Subsequently, the spring 36 is disposed on the base end portion 31 r side of the second shield 31.

  Next, as shown in FIG. 4, a cap 37 a is attached to the tip portion 37 t of the third shield 37. Subsequently, the third shield 37 is moved to the support portion 21 side of the electrode unit 2 while the second shield 31 is inserted through a hole (not shown) in the cap 37 a, and the distal end portion of the flange 21 b is moved to the proximal end of the third shield 37. Fit (insert) into the portion 37r. Thereby, the flange 21b and the 3rd shield 37 are connected. In this case, the first shield 23 is connected to the flange 21b, and the second shield 31 is connected to the first shield 23. The flange 21b is connected to the braided shield 26c of the shield cable 26 via the columnar portion 21a. For this reason, the first shield 23, the second shield 31, and the third shield 37 are all connected to the braided shield 26c and maintained at the same potential. Thus, the assembly of the shield unit 3 to the electrode unit 2 is completed.

  Next, the grip part 4 is assembled. Specifically, as shown in FIG. 3, the cases 41 and 42 are fitted so that the central portions of the electrode unit 2 and the shield unit 3 are sandwiched (enclosed) by the cases 41 and 42. At this time, the slider 46 is fitted into the notches (openings) in the upper portions of the cases 41 and 42. Subsequently, the front cap 43 is fitted into the front ends of the cases 41 and 42, and the rear cap 44 and the sleeve 45 are fitted into the rear ends of the cases 41 and 42.

  Next, a connector (for example, a BNC connector) (not shown) is connected to the other end of the shielded cable 26 (an end connected to a measuring device that performs measurement using the detection probe 1). Thus, the assembly of the detection probe 1 is completed.

  Next, a method for using the detection probe 1 will be described.

  For example, when measuring the voltage supplied to the electric wire 100 (see FIG. 13), the measuring probe (FIG. 13) is connected to the detecting probe 1 via a connector connected to the shield cable 26 in the electrode unit 2 of the detecting probe 1. (Not shown).

  Subsequently, the grip portion 4 is gripped, and then the slider 46 is slid in a second direction (direction of arrow B shown in FIG. 13) opposite to the first direction described above. At this time, the pin 34 to which the slider 46 is attached, the collar 33 to which the pin 34 is attached, the second shield 31 attached to the collar 33, and the shield cover 35 covering the second shield 31 are the first. As shown in the figure, the notch 31a of the second shield 31 is opened.

  Then, as shown in FIG. 14, the electric wire 100 is inserted into the notch 31a, and then the slide of the slider 46 is released. At this time, the second shield 31 is slid in the first direction (the direction of the arrow A shown in the figure) by the urging force of the spring 36. In addition, by sliding the second shield 31 in the first direction, the electric wire 100 is moved in the first direction by the edge portion of the notch 31 a, and the distal end portion 22 t of the detection electrode 22 becomes the insulating coating 102 of the electric wire 100. , The electric wire 100 is sandwiched between the tip 22t and the edge of the notch 31a, and the tip 22t comes close to the core wire 101 (detection target) of the electric wire 100.

  In this state, the detection electrode 22 and the core wire 101 are capacitively coupled via the insulating coating 102, and the detection electrode 22 detects the voltage of the electric wire 100. In the measuring device, an electric signal from the detection electrode 22 is input, and the voltage of the electric wire 100 is measured based on the electric signal.

  Subsequently, when the measurement is completed, the slider 46 is slid in the second direction to open the notch 31a of the second shield 31, and then the electric wire 100 is taken out from the notch 31a. Thus, the measurement of the voltage of the electric wire 100 is completed.

  Thus, the electrode unit 2 and the detection probe 1 include the detection electrode 22, the first shield 23, and the support portion 21 that supports the base end portions 22r and 23r of the detection electrode 22 and the first shield 23. The support portion 21 is configured to include the columnar portion 21a in which the through hole Ha is formed and the flange 21b in which the center hole Hb is formed, and the center hole is in a state where the base end portion 22r is insulated from the support portion 21. The detection electrode 22 is inserted into the Hb and the through hole Ha and supported by the support portion 21, and the first shield 23 is supported by the support portion 21 in a state where the base end portion 23 r is connected to the flange 21 b. By configuring the electrode unit 2 in this way, for example, by inserting the core wire 26a of the shield cable 26 into the through hole Ha, the detection electrode 22 and the core wire 26a can be connected without using a connection substrate or the like. The braided shield 26c of the shielded cable 26 covers the columnar portion 21a and is fixed (wrapped) to connect the first shield 23 connected to the columnar portion 21a (support portion 21) and the braided shield 26c. It is possible to connect via the columnar portion 21a without using a special substrate or the like. For this reason, according to this electrode unit 2 and the detection probe 1, compared with the structure which provides the board | substrate for connecting these, and the structure which connects these using a connector, the electrode unit 2 and the detection probe 1 are enough. Can be reduced in size. In addition, according to the electrode unit 2 and the detection probe 1, the detection electrode 22, the first shield 23, the core wire 26a of the shield cable 26, and the braided shield 26c of the shield cable 26 are soldered to the substrate via a conductive wire or a conductive member. Since the complicated work to be attached can be omitted, the assembly efficiency can be sufficiently improved.

  Further, according to the electrode unit 2 and the detection probe 1, for example, the shield cable 26 disposed so as to cover the outer peripheral surface C is provided by applying an anti-slip process to the outer peripheral surface C of the columnar portion 21 a of the support portion 21. When the braided shield 26c is connected and fixed to the outer peripheral surface C, the sliding of the braided shield 26c can be restricted, so that the working efficiency can be sufficiently increased and the braided shield 26c can be securely attached to the outer peripheral surface C. Can be fixed.

  Further, the electrode unit 2 and the detection probe 1 are provided with a conductive socket 27 and a connection tube 30. For this reason, according to the electrode unit 2 and the detection probe 1, the detection electrode is provided at the other end portion (tip portion 27t) of the socket 27 in which the core wire 26a of the shielded cable 26 is inserted into one end portion (base end portion 27r). The detection electrode 22 and the core wire 26a can be easily connected by simply inserting the base end portion 22r of 22. Further, the connection tube 30 is mounted around the columnar portion 21a covering the outer peripheral surface C with the braided shield 26c of the shield cable 26 and the braided shield 26c, and the connection tube 30 is crushed and pressure-bonded to connect to the columnar portion 21a. The formed first shield 23 and braided shield 26c can be easily connected. For this reason, according to this electrode unit 2 and the detection probe 1, the work efficiency of the operation | work which connects these can fully be improved.

  Further, according to the electrode unit 2 and the detection probe 1, since the claw portion 27 a that protrudes inward is formed in the socket 27, the insertion of the base end portion 22 r of the detection electrode 22 into the socket 27 allows the It is possible to reliably prevent the detection electrode 22 from coming off.

  In addition, according to the detection probe 1, a second notch 31a is formed on the distal end portion 31t so as to be slidable with respect to the first shield 23 and inserted into the detection target. Since the shield 31 is provided, the detection electrode 22 is slid by sliding the second shield 31 in the first direction toward the proximal end portion 23r of the first shield 23 with the detection target inserted in the notch 31a. And the edge of the notch 31a, the detection target can be sandwiched, and the tip 22t of the detection electrode 22 can be brought close to the detection target to detect the detected amount. Therefore, according to the detection probe 1, for example, even when a plurality of electric wires are arranged close to each other, the tip of the detection probe 1 (detection electrode 22, first shield 23 and 2nd shield 31 etc.) can be inserted and only one electric wire as each detection target can be easily clamped. Even in such a case, the detection amount for the detection target can be reliably detected. Can do. Further, according to this detection probe 1, since the first shield 23 is covered with the second shield 31, the detection electrode 22 can be shielded by the first shield 23 and the second shield 31. The influence of disturbance on 22 can be further reduced.

  In addition, according to the detection probe 1, since the third shield 37 covering the base end portion 23 r side of the first shield 23 and the base end portion 31 r side of the second shield 31 is provided, the first shield 23 and the second shield 23 are provided. Since the detection electrode 22 can be shielded by the shield 31 and the third shield 37, the influence of disturbance on the detection electrode 22 can be further reduced. In addition, according to the detection probe 1, the detection electrode 22 and the notch 31a are provided by including the spring 36 that biases the second shield 31 in the first direction toward the proximal end portion 23r of the first shield 23. Since the state in which the detection target is sandwiched between the edge portions can be maintained by the biasing force of the spring 36, workability can be sufficiently improved.

  In addition, the electrode unit 2 and the detection probe 1 are not limited to said structure. For example, although the example in which the electrode unit 2 is incorporated in the detection probe 1 has been described above, a configuration in which the electrode unit 2 is used without being incorporated in the detection probe 1 may be employed. As an example, when a conductor pattern is formed on a substrate and an insulating layer is formed so as to cover the conductor pattern, the tip 22t of the detection electrode 22 is brought close to the conductor pattern via the insulating layer to be measured. The electrode unit 2 can be used in a measuring device that detects a voltage as a quantity.

  Moreover, although it described above about the example applied to the electrode unit 2 provided with the electrode side part 2a and the cable side part 2b (shield cable 26 and connection part), it comprised only by the electrode side part 2a (the shield cable 26 connected) It can also be applied to electrode units). In this case, it is possible to connect the detection electrode 22 or the first shield 23 and the measuring device using a conductor or shield other than the shielded cable 26.

  Moreover, although the example using the connection tube 30 formed with the material which has electroconductivity was mentioned above, the connection tube formed with the material (nonelectroconductive material) which does not have electroconductivity can also be used.

DESCRIPTION OF SYMBOLS 1 Detection probe 2 Electrode unit 21 Support part 21a Columnar part 21b Flange 21t, 22t, 26at, 27t Tip part 22 Detection electrode 22r, 23r, 27r Base end part 23 1st shield 26 Shield cable 26a Core wire 26c Braided shield 27 Socket 27a Claw Part 30 Connection tube 31 Second shield 31a Notch 36 Spring 37 Third shield 100 Electric wire 101 Core wire C Outer peripheral surface Ha Through hole Hb Center hole

Claims (6)

An electrode unit having a rod-shaped detection electrode that detects a detected amount of the detection target without contact with a metal in a state in which the tip is close to the detection target and is connected to an external device via a core wire of a shielded cable. And
A cylindrical first shield that covers the detection electrode in a state of being insulated from the detection electrode, and a conductive support that supports the base ends of the detection electrode and the first shield,
The support portion includes a columnar portion in which a through hole is formed at a central portion and a shield conductor of the shielded cable is connected to an outer peripheral surface, and a central hole that is provided at a tip portion of the columnar portion and communicates with the through hole. And a flange formed with,
In the state where the detection electrode is insulated from the support portion, the base end portion is inserted into the center hole and the through hole and supported by the support portion,
The first shield is an electrode unit supported by the support portion in a state where the base end portion is connected to the flange.   The electrode unit according to claim 1, wherein the outer peripheral surface of the columnar portion is subjected to anti-slip processing. The shield cable, and the connection portion for connecting the core conductor and the detection electrode of the shield cable and connecting the shield conductor and the columnar portion of the shield cable,
The connection portion includes a conductive socket and a connection tube,
The socket connects a distal end portion of the core wire inserted from each end side of the socket and the proximal end portion of the detection electrode,
The said connection tube connects the said columnar part and the said shield conductor by crimping | bonding the said shield conductor in the said outer peripheral surface of the said columnar part, and inserting in the said connection tube. The electrode unit described.   The electrode unit according to claim 3, wherein the socket is formed with a claw portion that protrudes inward to prevent the detection electrode from coming off.   The electrode unit according to any one of claims 1 to 4, and an outer side of the first shield that is slidable with respect to the first shield of the electrode unit and connected to the first shield, and A second shield having a notch for inserting a detection target formed at a distal end thereof, and a first direction toward the base end side of the first shield in a state where the detection target is inserted into the notch A detection probe configured such that the tip of the detection electrode can be brought close to the detection target when the second shield slides. A cylindrical third shield that covers the base end side of the first shield and the base end side of the second shield, and the second shield that is accommodated in the third shield and is in the first direction. An urging section for urging,
The detection probe according to claim 5, wherein the third shield is connected to the flange in a state where the flange is fitted into a base end portion.

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