JP3179044U - Coaxial cable, magnetic sensor using coaxial cable, and socket for magnetic sensor - Google Patents

Abstract

Provided is a coaxial cable in which a conductor is not broken even under a condition in which repeated extension and bending are repeated, and even a long detection object can be easily and reliably magnetically connected. Provided is a magnetic sensor capable of performing detection.
An outer conductor is formed around a first insulator formed so as to cover an outer periphery of an inner conductor so as to be wound in a coil shape, and the outer periphery of the outer conductor is further provided as a second insulator. A coaxial cable with high bending resistance is provided. In addition, a magnetic sensor that can detect magnetism simply and reliably is provided by forming the coaxial cable in a substantially annular shape to form a detection coil.
[Selection] Figure 4

Description

  The present invention relates to a coaxial cable, a magnetic sensor using the coaxial cable, and a socket used for the magnetic sensor.

Coaxial cables are widely used in signal transmission cables for industrial robots, etc., and electric wire cables in information equipment such as computers. Patent Document 1 discloses a technique related to a conventional coaxial cable.
FIG. 3 is a diagram showing a conventional coaxial cable disclosed in Patent Document 1. As shown in FIG. The coaxial cable 11 includes an inner conductor 12, a first insulator 14 formed so as to cover the outer periphery of the inner conductor 12, and an outer conductor 13 formed in a mesh shape on the outer periphery of the first insulator 14. The second insulator 15 is formed so as to cover the outer periphery of the outer conductor 13, and the sheath 16 (insulator) covers the outer peripheral surface of the second insulator 15.

  As another background art, a magnetic sensor that detects a magnetic field or the like is used for inspection of a substance. Patent Document 2 discloses a technique related to a conventional fluxgate magnetic sensor, which detects a change in a magnetic field inside an annular magnetic body as a voltage value generated in a detection coil.

Japanese Patent Laid-Open No. 2001-23456 JP 2005-164562 A

In particular, when the coaxial cable disclosed in Patent Document 1 is used for signal transmission of an industrial robot or the like, the coaxial cable is repeatedly expanded and bent during use as the industrial robot moves. In particular, there is a problem that the mesh-shaped outer conductor formed on the outer periphery of the first insulator is disconnected.
In addition, the magnetic sensor disclosed in Patent Document 2 has a configuration in which an excitation coil and a detection coil are formed on an annular magnetic body, and as an example, the detection target is a member extending from the floor to the ceiling. Has a problem that it is difficult to position the detection target at the center of the magnetic body.

  Accordingly, an object of the present invention is to provide a coaxial cable in which the conductor does not break even under the condition that the extension and bending of the coaxial cable are repeated repeatedly, and a long detection object. Even so, it is an object of the present invention to provide a magnetic sensor that can easily and reliably detect magnetism.

The device according to claim 1 of the present application is an inner conductor, a first insulator formed so as to cover the outer periphery of the inner conductor, and a coil wound around the outer periphery of the first insulator. A coaxial cable comprising an outer conductor and a second insulator formed so as to cover the outer periphery of the outer conductor.
The invention according to claim 2 of the present application is the coaxial cable according to claim 1, further comprising a third insulator covering an outer periphery of the second insulator.

A device according to claim 3 of the present application is a magnetic sensor using the coaxial cable according to claim 1 or 2, wherein the inner conductor and the outer conductor are electrically connected to each other at the end of the coaxial cable. A magnetic sensor is characterized in that a substantially annular detection coil is formed by attaching a portion in the vicinity of the coaxial cable.
Further, the invention according to claim 4 of the present application is characterized by including a socket attached to the coaxial cable, and forming the substantially annular detection coil by inserting an end of the coaxial cable into the socket. The magnetic sensor according to claim 3.

  A device according to claim 5 of the present application is a magnetic sensor socket to be attached to the coaxial cable according to claim 1 or 2, wherein an end of the coaxial cable is inserted into the substantially circular circle for the magnetic sensor. The magnetic sensor socket is characterized in that an annular detection coil can be formed.

According to the invention of claim 1 of the present application, in the coaxial cable, by using an outer conductor wound in a coil shape as the outer conductor, the conductor may be disconnected even under a condition where repeated extension and bending are repeated. A coaxial cable that does not need to be provided can be provided.
Further, the device according to claim 2 of the present application is provided with a third insulator covering the outer periphery of the second insulator, so that sufficient wear resistance can be obtained even if the movement is repeated by using a coaxial cable. Can have.

According to the invention of claim 3 of the present application, at the end of the coaxial cable configured as described above, the inner conductor and the outer conductor are electrically connected, and the end is attached in the vicinity of the coaxial cable. By forming the magnetic sensor and forming a magnetic sensor, it is possible to easily and reliably detect magnetism even for a long detection object.
According to the invention according to claims 4 and 5 of the present application, when forming a substantially annular detection coil using a coaxial cable, the end of the coaxial cable is used by using a socket into which the end of the coaxial cable can be inserted. Can be easily attached to the vicinity of the coaxial cable.

FIG. 1 is a diagram schematically showing the structure of the coaxial cable of the present invention. FIG. 2 is a reference view in which a coil-shaped outer conductor is extended in the coaxial cable of the present invention. FIG. 3 is a diagram schematically showing the structure of a conventional coaxial cable. FIG. 4 is a diagram schematically showing the structure of the magnetic sensor of the present invention configured using the coaxial cable of the present invention. FIG. 5 is a reference diagram showing a state before the end of the coaxial cable is attached in the vicinity of the coaxial cable in the magnetic sensor of the present invention. FIG. 6 is a schematic diagram showing the shape of the end of a coaxial cable used in the magnetic sensor of the present invention. FIG. 7 is an enlarged view of the vicinity of the connecting portion when the end of the coaxial cable is attached to the vicinity of the coaxial cable using a socket in the magnetic sensor of the present invention. FIG. 8 is a schematic diagram showing a method for detecting a detected voltage value in the magnetic sensor of the present invention.

An embodiment of a coaxial cable of the present invention will be described with reference to the drawings. FIG. 1 is a view schematically showing the structure of the coaxial cable of the present invention, and FIG. 2 is a reference view in which a coiled outer conductor in the coaxial cable of the present invention is extended for the purpose of explanation.
A coaxial cable 1 of the present invention is wound in a coil shape around an inner conductor 2, a first insulator 4 formed so as to cover the outer periphery of the inner conductor 2, and an outer periphery of the first insulator 4. The outer conductor 3, the second insulator 5 formed so as to cover the outer periphery of the outer conductor 3, and the sheath 6 formed so as to cover the outer periphery of the second insulator 5.
The periphery of the outer conductor 3 is covered with an insulator (not shown) which will be described later, and is formed as shown in FIG. 2 when pulled and extended. FIG. 2 is a reference diagram showing a shape in which an external conductor is extended for explanation of the coil shape, and is not used in a state where it is extended in actual use.

The inner conductor 2 is formed of a material having good conductivity, and in this embodiment, a bare soft conductor having an outer shape of 0.2 mm plus or minus 0.008 mm is used.
The first insulator 4 is provided to insulate the inner conductor 2 and the outer conductor 3, and has a two-layer structure in this embodiment. The inner layer is a cross-linked polyethylene having a thickness of 0.496-0504 mm and an outer shape of 1.20 mm plus or minus 0.05 mm.
The outer conductor 3 is formed of a material having good conductivity. In this embodiment, UEW in which urethane varnish is baked on the conductor is used, and the pitch between the conductor centers is 0.079 to 0.085 mm. The outer diameter is 3.11 to 3.29 mm, and the number of turns per 10 cm is 550 plus or minus 10 times.
The second insulator 5 is provided to insulate the outer conductor 3 from an external member. In this embodiment, the second insulator 5 is transparent polypropylene, has a thickness of 0.092 to 0.108 mm, and an outer diameter. The thing of 3.21-3.39mm is used.
The sheath 6 is provided for protecting the coaxial cable, and vinyl chloride is used in this embodiment. Thereby, heat resistance can be used up to 130 ° C. and cold resistance up to −40 ° C. The thickness is 0.445 to 0.455 mm, and the outer diameter is 4.30 mm.

  Compared with the coaxial cable shown in FIG. 3 in which the conventional outer conductor is formed in a mesh shape, the conventional coaxial cable was used for signal transmission of an industrial robot or the like. When used under conditions where repeated elongation and bending are repeated, disconnection of the outer conductor was observed, whereas in the coaxial cable of this example, disconnection was not recognized and high bending resistance was achieved. Indicated.

  An embodiment of a magnetic sensor using a coaxial cable of the present invention will be described with reference to the drawings. FIG. 4 is a diagram schematically showing the structure of the magnetic sensor of the present invention configured using the coaxial cable of the present invention, and FIG. 5 is a diagram of the coaxial cable of the present invention shown in FIG. It is the reference figure which showed the state before attaching an edge part to the vicinity of a coaxial cable. FIG. 6 is a schematic diagram showing the shape of the end of the coaxial cable used in the magnetic sensor of the present invention. Further, FIG. 7 is an enlarged view of the vicinity of the connecting portion when the end of the coaxial cable is attached to the vicinity of the coaxial cable using the socket in the magnetic sensor of the present invention, and FIG. It is a schematic diagram which shows the method of detecting the measured voltage value.

  The magnetic sensor 21 using the coaxial cable of the present embodiment is used in the shape shown in FIG. 4, and the coaxial cable 22 is a coaxial cable in which the outer conductor used in the previous embodiment is wound in a coil shape. From the state shown in FIG. 5, a substantially annular detection coil is formed by inserting the tip of the coaxial cable 22 into a socket 23 mounted in the middle of the coaxial cable 22. Reference numeral 24 denotes an external conductor, which serves to lead the induced current generated in the detection coil to the outside.

  As shown in FIG. 6, the end portion of the coaxial cable 22 inserted into the socket 23 is configured such that the inner conductor and the outer conductor are conducted. When conducting, it can be conducted by a conventionally known method such as soldering (not shown). Further, when this embodiment is used underwater or the like, the waterproof connector 25 shown in FIG. 6 can be inserted into the socket 23 after being attached to the end of the coaxial cable 22.

  FIG. 7 is an enlarged view of the vicinity of the connecting portion. The socket 23 according to the present embodiment has a shape in which two cylindrical members are bonded. The coaxial cable 22 and the external conductor 24 are inserted into one cylindrical member, and the other cylindrical member is coaxial. The end of the cable 22 is formed to be inserted.

  In the present embodiment, the external conducting wire 24 has a coaxial cable shape in which the coaxial cable 22 is pulled out as it is.

  The magnetic sensor using the coaxial cable of the present embodiment is used by installing the substantially annular detection coil shown in FIG. 4 on the detection target or surrounding the detection target. At this time, the detection coil is formed in a substantially annular shape by inserting the end portion of the coaxial cable 22 into the socket 23, and the detection target is long or extends from the floor to the ceiling. Even if it exists, it is possible to easily install the detection coil so as to surround the detection target, and it is possible to detect magnetism simply and reliably.

  In the magnetic sensor using the coaxial cable of this embodiment, as shown in FIG. 8, the induced current generated in the detection coil is converted into the voltage between the inner conductor and the outer conductor at the end of the outer conductor 24. By detecting.

Hereinafter, the experiment based on this invention is demonstrated concretely. The present invention is based on the findings obtained from the results of the following experiments.
(Experiment 1)
The following experiment was conducted to confirm the voltage generation by the magnetic change of the magnetic sensor using the coaxial cable of the present invention.
(Specimen 1)
As the coaxial cable, a coaxial cable in which an outer conductor was wound in a coil shape was used, and a substantially annular detection coil was formed with the coaxial cable.
(Comparative Example 1)
A coaxial cable in which a conventional outer conductor was formed in a mesh shape was used as the coaxial cable, and a substantially annular detection coil was formed with the coaxial cable.
(Comparative Example 2)
As the coaxial cable, a coaxial cable in which an outer conductor was wound in a coil shape was used, and a coaxial cable was produced without forming a substantially annular shape.
(result)
When each was installed on a name printer, a voltage of 0.111 V was detected for the test body 1, but no voltage was detected in Comparative Example 1 and Comparative Example 2. It is considered that a change in magnetism can be detected by forming a detection coil formed in a substantially annular shape using a coaxial cable in which the outer conductor is wound in a coil shape according to the present invention.

  In this embodiment, the socket 23 to which two cylindrical members are bonded is used as a member for attaching the end portion of the coaxial cable 22 to the vicinity of the coaxial cable 22. It can also be fixed by other fixing means such as fixing with tape or fixing with Velcro.

  In the present embodiment, the outer conductor 3 was coated with a urethane varnish which is an insulator on the surface, but the adjacent wires of the coiled outer conductor were insulated by other methods, An uncoated outer conductor can also be used.

  Furthermore, in the present embodiment, the coaxial cable 22 is drawn out as it is as the external conductor 24. However, in the present invention, the detection coil unit is assumed to be a coil of the external conductor of the present invention. As for the external conductors, the internal conductors and the external conductors of the coaxial cable 22 are respectively connected to the conductor parts of the external conductors in the socket 23 as other forms of conductors such as a biaxial cable. You can also.

1 Coaxial Cable 2 Inner Conductor 3 Outer Conductor 4 First Insulator 5 Second Insulator 6 Sheath 11 Coaxial Cable 12 Inner Conductor 13 Outer Conductor 14 First Insulator 15 Second Insulator 16 Sheath 21 Magnetic Sensor 22 Coaxial cable (detection coil)
23 Socket 24 External conductor 25 Connector for waterproofing 26 Voltmeter

Claims (5)

An inner conductor,
A first insulator formed to cover the outer periphery of the inner conductor;
An outer conductor wound in a coil around the outer periphery of the first insulator;
A second insulator formed to cover the outer periphery of the outer conductor;
Coaxial cable characterized by comprising The coaxial cable according to claim 1, further comprising a third insulator covering an outer periphery of the second insulator. A magnetic sensor using the coaxial cable according to claim 1 or 2,
At the end of the coaxial cable, the inner conductor and the outer conductor are conducted,
A magnetic sensor characterized in that a substantially annular detection coil is formed by attaching the end in the vicinity of the coaxial cable. A socket mounted on the coaxial cable;
The magnetic sensor according to claim 3, wherein the substantially annular detection coil is formed by inserting an end of the coaxial cable into the socket. A socket for a magnetic sensor attached to the coaxial cable according to claim 1 or 2,
A magnetic sensor socket characterized in that a substantially annular detection coil for a magnetic sensor can be formed by inserting an end of the coaxial cable.

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