JP2011034766A - Terminal structure for coaxial cable - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a terminal structure for a coaxial cable, which can shorten the length in the axial line direction as well as easily carrying out terminal processing of the coaxial cable without using such as a special exclusive tool. <P>SOLUTION: A terminal structure of the coaxial cable 1 has the outer circumference surface of an inner conductor 2 coated by an inner insulating layer 3, an outer circumference surface of the inner insulating layer coated by an outer conductor 4 and an outer circumference surface of the outer conductor coated by an outer insulating layer 5. The coaxial cable has a first cutting section 8 formed extending in the direction of circumference of the coaxial cable and disrupts the outer insulating layer and the outer conductor in the direction of the axial line O for the coaxial cable by cutting off at least the outer insulating layer and the outer conductor. Then, a filler member 9 having insulating property is arranged in the first cut section and a connecting terminal 10 composed of conductors that are respectively electrically conducted to the inner conductor and the outer conductor are included on an end surface of the coaxial cable. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a terminal structure of a coaxial cable.

In recent years, cases of using coaxial cables as wiring materials are increasing in information communication devices, digital cameras, personal computers, medical devices, and the like that process large volumes of data at high speed.
As a schematic configuration of a coaxial cable used for transmission of a general communication signal, an inner conductor for transmitting a communication signal is disposed at the center of the cable, and an inner insulating layer made of a dielectric is coated on the outer peripheral surface of the inner conductor. The outer peripheral surface of the inner insulating layer is covered with an outer conductor for preventing the occurrence of electromagnetic noise disturbance, and the outer peripheral surface of the outer conductor is covered with an outer insulating layer made of a dielectric. In such a coaxial cable, when it is electrically connected to an electric circuit board or the like, it is necessary to end-process the coaxial cable so that it can be connected to a joint portion of a connection partner.

  Conventionally, the end treatment method of a coaxial cable is as follows. Using a tool or the like, the inner insulating layer covering the end of the inner conductor, the outer conductor, and the outer insulating layer are removed for the length of the electrical connection, and the inner conductor is exposed. In addition, there is a method of removing the outer insulating layer and exposing the end portion of the outer conductor. Coaxial cable terminated in this way can be connected by fixing the end of the exposed inner conductor to the joint of the connection partner with a conductor such as solder or by adhering it to the contact terminal with a conductive adhesive. Electrically connected to the other party. Furthermore, in the coaxial cable, in order to prevent the occurrence of electromagnetic noise disturbance by setting the outer conductor to the ground potential, the exposed end of the outer conductor is fixed to the ground conductor connected to the earth with solder or the like. Glue with adhesive.

  Also, as a terminal processing method for coaxial cables, conventionally, for example, as shown in Patent Document 1 below, a plurality of coaxial cables are arranged in a line to form a flat cable, and the outer conductors of the plurality of coaxial cables are grounded together. The method of making it known is known. In this method, the ends of a plurality of coaxial cables are arranged in parallel. In addition, at the end of each coaxial cable, the length of the inner conductor is electrically exposed, and the end of the inner insulating layer is exposed for a length that prevents the exposed inner conductor and the outer conductor from conducting. Further, the end portion of the outer conductor is exposed with a sufficient length. Then, the exposed end portions of the external conductors are electrically connected to each other through a ground bar made of a conductor and grounded through the ground bar, or each external conductor is twisted to form a single stranded wire. It is grounded through this stranded wire.

  Moreover, as a terminal processing method of a coaxial cable, the method as shown, for example in the following patent document 2 is proposed. In this method, first, the end portion of the outer conductor is removed to expose the end portion of the outer conductor. Next, the outer insulating layer is cut at a predetermined position to separate a part of the end of the outer insulating layer. Next, the separator of the outer insulating layer is moved slightly along the outer peripheral surface of the outer conductor toward the end of the coaxial cable, and the separator is separated from the main body of the outer insulating layer. Thereafter, the separated body and the outer conductor are joined with solder or the like. Next, the above-described separator is moved to the terminal opposite side (external insulating layer body side). As a result, the end portion of the outer conductor also moves together with the separator, and a part of the outer conductor is formed in a bowl shape toward the radially outer side between the separator and the outer insulating layer body. Next, the outer conductor formed in a bowl shape is cut over the entire circumference. Thereafter, the separator is moved to the end side, and the end portion of the outer conductor is extracted from the inner insulating layer together with the separator. Thereby, the edge part of an internal insulating layer is exposed. Thereafter, the exposed inner insulating layer is cut at a predetermined position, the end of the inner insulating layer is extracted from the inner conductor, and the inner conductor is exposed by the length for electrical connection.

JP 2006-196418 A JP 2005-312093 A

However, in the above prior art, the terminal structure of the coaxial cable after the terminal processing is configured such that the exposed inner conductor protrudes from the tip of the exposed tubular outer conductor, and is fixed to the joint of the connection partner. The connected portion (exposed end portion of the inner conductor) and the grounded portion (exposed end portion of the outer conductor) connected to the ground are connected in series in the axial direction of the coaxial cable. ing. Therefore, the axial direction length of the terminal structure of a coaxial cable becomes long, and there exists a problem that size reduction and thickness reduction of a communication apparatus, an electrical apparatus, etc. are prevented.
Also, in an ultra-thin coaxial cable, the inner conductor is very thin and flexible, so it is difficult to handle the inner conductor when fixing the exposed inner conductor to the joint of the connection partner. Thin and easy to break. Therefore, it is difficult to perform terminal processing on an extremely fine coaxial cable, and there is a problem that a high skill or a dedicated machine is required.
Furthermore, when terminating an extremely fine coaxial cable, there is a problem that a special dedicated tool for removing the outer insulating layer, the outer conductor, and the terminal portion of the inner insulating layer is necessary.

  The present invention takes the above-described conventional problems into consideration, can reduce the axial length, and can easily perform end processing of a coaxial cable without using a special dedicated tool or the like. A terminal structure of a coaxial cable is provided.

  In the terminal structure of the coaxial cable of the present invention, the outer peripheral surface of the inner conductor is covered with an inner insulating layer, the outer peripheral surface of the inner insulating layer is covered with an outer conductor, and the outer peripheral surface of the outer conductor is covered with an outer insulating layer. In the terminal structure of the coaxial cable, the coaxial cable extends in the circumferential direction of the coaxial cable and cuts at least the outer insulating layer and the outer conductor to connect the outer insulating layer and the outer conductor to the outer end. A first cut portion is formed that is divided in the axial direction of the coaxial cable, and an insulating filling member is disposed in the first cut portion, and the inner conductor and the outer portion are disposed on a terminal surface of the coaxial cable. A connection terminal made of a conductor that is electrically conducted to each conductor is provided.

According to the present invention, the outer peripheral surface of the coaxial cable is cut with a blade or the like to form the first cut portion, the filling member is disposed in the first cut portion, and connected to the end surface of the coaxial cable with solder or the like. The terminal structure of the coaxial cable is formed by forming the terminal. For this reason, it is not necessary to remove the end portions of the inner insulating layer, the outer conductor, and the outer insulating layer, and the end portions of the inner conductor remain covered with the inner insulating layer, the outer conductor, and the outer insulating layer. Accordingly, the axial length of the terminal structure of the coaxial cable can be shortened.
Further, the end treatment of the coaxial cable can be easily performed with a blade or a soldering device without using a special dedicated tool or the like.

Further, when connecting the coaxial cable to the connection partner, a connection terminal provided on the end face of the coaxial cable is brought into contact with the joint of the connection partner. At this time, since the connection terminal is electrically connected to the inner conductor and the outer conductor, the connection terminal has a larger surface area than the inner conductor.
In addition, since the outer conductor is divided by the first cut portion and the insulating filling member is disposed in the first cut portion, the outer conductors on both sides in the axial direction sandwich the first cut portion. It will be in an electrically insulated state. Therefore, even if the end portion of the outer conductor is electrically connected to the joint portion of the connection partner via the connection terminal, the outer conductor on the center side in the axial direction (opposite end side) than the first cut portion. The intermediate portion can be made less susceptible to electrical influence from the connection terminal.

In the terminal structure of the coaxial cable, it is more preferable that at least one of the inner insulating layer and the outer insulating layer is made of a fluororesin, and the filling member is a cyanoacrylate adhesive.
In addition, the cyanoacrylate-type adhesive agent said here means the adhesive agent which has 2-cyanoacrylic acid ester monomer as a main component.
According to the present invention, at least an inner insulating layer and an outer insulating layer of an AWG (American Wire Gauge) 40 standard or less, that is, an ultrafine coaxial cable having an outer diameter of an inner conductor of 0.08 mm or less. By using a fluororesin on one side, the conditions of insulation, mechanical strength, and chemical stability required for each insulation layer of the coaxial cable can be satisfied. In addition, when the cyanoacrylate adhesive used as a filling member adheres each insulating layer and each conductor on both sides in the axial direction across the first cut portion, a certain adhesive strength required as a coaxial cable Can be satisfied.
Therefore, an ultrafine coaxial cable can be formed by using a fluororesin for at least one insulating layer and a cyanoacrylate adhesive as a filling member.

Further, in the terminal structure of the coaxial cable, the coaxial cable has a second cut portion formed by cutting at least the outer insulating layer on a side opposite to the terminal side from the first cut portion, and the second cut More preferably, the portion is provided with a connecting portion made of a conductor that is electrically connected to the outer conductor.
According to the present invention, the external conductor can be electrically connected to the ground line, the bias, and the like by connecting the ground line and the connection line to the bias to the connection portion.

  According to the terminal structure of the coaxial cable of the present invention, the axial length can be shortened, and the terminal processing of the coaxial cable can be easily performed without using a special dedicated tool or the like.

It is sectional drawing of the axial direction of the terminal part of the coaxial cable before the terminal for describing embodiment of this invention is processed. It is a perspective view of the terminal structure of the coaxial cable of 1st Embodiment of this invention. It is sectional drawing of the axial direction of the terminal structure of the same coaxial cable. It is explanatory drawing which shows the shaping | molding method of the terminal structure of the same coaxial cable. It is explanatory drawing which shows the shaping | molding method of the terminal structure of the same coaxial cable. It is sectional drawing of the axial direction of the terminal structure of the coaxial cable of the modification of 1st Embodiment of this invention. It is sectional drawing of the axial direction of the terminal structure of the coaxial cable of another modification of 1st Embodiment of this invention. It is sectional drawing of the axial direction of the terminal structure of the coaxial cable of 2nd Embodiment of this invention.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a terminal structure of a coaxial cable according to the present invention will be described based on the drawings.
First, the configuration of the coaxial cable 1 before the terminal in the present embodiment is processed will be described with reference to FIG. Below, the case where the coaxial cable 1 is the AWG40 standard or less, that is, the case where the outer diameter of the inner conductor is 0.08 mm or less is described.
FIG. 1 is a cross-sectional view in the axial direction of the end portion of the coaxial cable 1 before the terminal is processed.

As shown in FIG. 1, in the coaxial cable 1, the outer peripheral surface of the inner conductor 2 is covered with an inner insulating layer 3, the outer peripheral surface of the inner insulating layer 3 is covered with an outer conductor 4, and the outer peripheral surface of the outer conductor 4 is external. The cable has a configuration covered with an insulating layer 5.
The inner conductor 2 is a core wire made of a conductor for transmitting an electrical signal. The inner insulating layer 3 is a tubular body that covers the entire outer periphery of the inner conductor 2. The outer conductor 4 is a barrier layer for preventing the occurrence of electromagnetic noise disturbance, and is a conductor made of a braided wire knitted with a metal wire, for example. The outer insulating layer 5 is a sheath tube (protective coating) that covers the outer peripheral surface of the outer conductor 4 over the entire circumference.
The inner insulating layer 3 and the outer insulating layer 5 are made of a dielectric material such as a fluororesin having flexibility and stretchability. The inner conductor 2 and the outer conductor 4 are made of a metal such as copper, for example.

  Next, the terminal structure of the coaxial cable 1 having the above configuration will be described.

(First embodiment)
First, 1st Embodiment of the terminal structure of the coaxial cable 1 is described based on FIGS. 2 is a perspective view of the end portion of the coaxial cable 1, and FIG. 3 is a cross-sectional view of the end portion of the coaxial cable 1 cut in the direction of the axis O of the coaxial cable 1.
Note that the direction D1 side in FIG. 3 is the terminal side in the direction of the axis O of the coaxial cable 1, and is simply referred to as “terminal side” hereinafter. Further, the direction D2 side in FIG. 2, that is, the side opposite to the above-described end side is the center side in the direction of the axis O of the coaxial cable 1, and is simply referred to as “center side” hereinafter. In the following description of the embodiment, the direction of the axis O is referred to as “axial direction”, the radial direction of the coaxial cable 1, that is, the direction orthogonal to the axis O is referred to as “radial direction”, and the circumferential direction of the coaxial cable 1. That is, the direction around the axis O is referred to as “circumferential direction”.

First, the configuration of the terminal structure of the coaxial cable 1 will be described.
As shown in FIGS. 2 and 3, a first cut portion 8 that extends in the circumferential direction and cuts the inner insulating layer 3, the outer conductor 4, and the outer insulating layer 5 at the end portion of the coaxial cable 1, as shown in FIGS. 2 and 3. Is formed.
The first cut portion 8 is a cut in which the radial length (depth) reaches from the outer peripheral surface of the outer insulating layer 5 to the inner peripheral surface of the inner insulating layer 3 (the outer peripheral surface of the inner conductor 2). The cable 1 extends around the entire circumference of the cable 1 and forms an annular shape centering on the axis O. In other words, the first cut portion 8 is a cut that divides the outer insulating layer 5, the outer conductor 4, and the inner insulating layer 3 in the axial direction.

The end portions of the inner insulating layer 3, the outer conductor 4, and the outer insulating layer 5 are each divided into two by the first cut portion 8 described above.
More specifically, the internal insulating layer 3 includes a terminal-side internal insulating layer 31 disposed on the terminal side of the first cut portion 8, and a center-side internal insulating layer 32 disposed on the center side of the first cut portion 8. , Is provided.
Similarly, the outer conductor 4 includes a terminal-side outer conductor 41 disposed on the terminal side from the first cutting portion 8 and a center-side outer conductor 42 disposed on the center side from the first cutting portion 8. The external insulating layer 5 includes a terminal-side external insulating layer 51 disposed on the terminal side from the first cut portion 8 and a center-side external insulating layer 52 disposed on the center side from the first cut portion 8. Yes.

Further, in the coaxial cable 1 of the present embodiment, the first cut portion 8 is provided with an insulating cyanoacrylate adhesive (filling member) 9, and the end-side surface (end surface) of the coaxial cable 1. Is provided with a connection terminal 10 made of a conductor that is electrically connected to the terminal-side outer conductor 41 of the inner conductor 2 and the outer conductor 4, respectively.
The cyanoacrylate adhesive 9 referred to here means an adhesive mainly composed of a 2-cyanoacrylate monomer.
Further, the term “terminal side surface” of the coaxial cable 1 as used herein means the end side surfaces of the inner conductor 2, the terminal side inner insulating layer 31, the terminal side outer conductor 41, and the terminal side outer insulating layer 51. To do.

The cyanoacrylate adhesive 9 is an adhesive that can bond not only a metal such as copper but also a fluororesin with a certain strength required for the coaxial cable 1.
The cyanoacrylate adhesive 9 includes a terminal-side inner insulating layer 31 and a center-side inner insulating layer 32, a terminal-side outer conductor 41 and a center-side outer conductor 42, and a terminal-side outer insulating layer 51 and a center-side outer insulating layer 52. Each is connected.
The cyanoacrylate adhesive 9 holds the terminal-side outer conductor 41 and the center-side outer conductor 42, and the center-side outer conductor 42 and the inner conductor 2 so as to be surely insulated.

The connection terminal 10 is formed in a bottomed cylindrical shape having a conductor by soldering, plating, or attaching a metal member. The connection terminal 10 covers the terminal-side surfaces of the inner conductor 2, the terminal-side inner insulating layer 31, the terminal-side outer conductor 41 and the terminal-side outer insulating layer 51, and the outer peripheral surface of the terminal-side outer insulating layer 51. Are joined together.
The terminal-side outer conductor 41 is electrically connected to the inner conductor 2 through the connection terminal 10, but the center-side outer conductor 42 and the terminal-side outer conductor 41 are insulated by the cyanoacrylate adhesive 9. The inner conductor 2 and the central outer conductor 42 are in an insulated state.

In the coaxial cable 1 of the present embodiment, a part of each of the central outer conductor 42 and the central outer insulating layer 52 in the circumferential direction is located at a certain distance from the first cut portion 8 to the central side. The second cutting part 13 is formed, and the second cutting part 13 is provided with a ground connection part (connection part) 14 made of a conductor that is electrically connected to the central outer conductor 42.
The center-side outer conductor 42 and the center-side outer insulating layer 52 are formed with a through hole 42a and a through hole 52a that are communicated with each other by cutting a part in the circumferential direction. The through hole 42a and the through hole 52a The second cutting portion 13 described above is configured.
The ground connection portion 14 is formed in a substantially ring shape and is fitted to the second cutting portion 13 so as to project radially inward from the inner peripheral surface of the connection portion main body 14a. And a projecting body 14 b that is electrically connected to the central outer conductor 42.

Next, a method for forming the terminal structure of the coaxial cable 1 described above, that is, a terminal processing method for the coaxial cable 1 will be described.
First, in the coaxial cable 1 before the terminal as shown in FIG. 1 is processed, as shown in FIG. 4, the first cutting portion 8 is disposed on the distal end side at a constant interval in the axial direction on the outer peripheral surface. The 2nd cutting part 13 is formed in a center side with a blade etc., respectively.
Thus, the inner insulating layer 3 is connected to the terminal-side inner insulating layer 31 and the center-side inner insulating layer 32, the outer conductor 4 is connected to the terminal-side outer conductor 41 and the center-side outer conductor 42, and the outer insulating layer 5 is connected to the terminal-side outer insulating layer. 51 and a central outer insulating layer 52. And the through-hole 42a and the through-hole 52a are formed in the center side outer conductor 42 and the center side outer insulating layer 52, respectively.
At this time, the terminal-side inner insulating layer 31, the terminal-side outer conductor 41, and the terminal-side outer insulating layer 51 are
Axis lines between the inner conductor 2 and the terminal-side inner insulating layer 31, between the terminal-side inner insulating layer 31 and the terminal-side outer conductor 41, and between the terminal-side outer conductor 41 and the terminal-side outer insulating layer 51, respectively. It is fixed only by friction acting in the O direction. For this reason, the terminal-side inner insulating layer 31, the terminal-side outer conductor 41, and the terminal-side outer insulating layer 51 are easily displaced in the axis O direction with respect to the inner conductor 2.

Next, as shown in FIG. 5, a cyanoacrylate adhesive 9 is disposed on the first cut portion 8. Thus, the terminal-side inner insulating layer 31 and the center-side inner insulating layer 32, the terminal-side outer conductor 41 and the center-side outer conductor 42, and the terminal-side outer insulating layer 51 and the center-side outer insulating layer 52 are connected to each other.
In addition, the melted solder is poured into the second cutting portion 13 to form the protruding body 14b connected to the central outer conductor 42. Then, the outer peripheral surface of the projecting body 14b is covered, and the connecting portion main body 14a is disposed by being fitted around the outer peripheral insulating layer 52, thereby joining the projecting body 14b and the connecting portion main body 14a. In this manner, the ground connection portion 14 having the connection portion main body 14a and the protruding body 14b is formed.

Next, as shown in FIG. 3, the connection terminal 10 is formed on the terminal-side surface of the coaxial cable 1 with solder or the like.
The coaxial cable 1 having processed the terminal as described above transmits and receives signals by connecting the connection partner, the connection terminal 10 and the ground connection part (connection part) 14 respectively.

Thus, according to the terminal structure of the coaxial cable 1 of the first embodiment of the present invention, the first cut portion 8 is formed by cutting the outer peripheral surface of the coaxial cable 1 with a blade or the like, The terminal structure of the coaxial cable 1 is formed by disposing the acrylate adhesive 9 and forming the connection terminal 10 on the end face of the coaxial cable 1 with solder or the like. Therefore, it is not necessary to remove the end portions of the inner insulating layer 3, the outer conductor 4, and the outer insulating layer 5, and the end portions of the inner conductor 2 remain covered with the inner insulating layer 3, the outer conductor 4, and the outer insulating layer 5. It becomes the state of. Therefore, the axial direction length of the terminal structure of the coaxial cable 1 can be shortened.
Further, the end treatment of the coaxial cable 1 can be easily performed with a blade or a soldering device without using a special dedicated tool or the like.

Further, when the coaxial cable 1 is connected to a connection partner, the connection terminal 10 provided on the terminal-side surface of the coaxial cable 1 is brought into contact with the joint of the connection partner. At this time, the connection terminal 10 is electrically connected to the inner conductor 2 and the terminal-side outer conductor 41, respectively, and the outer diameter is substantially equal to the outer diameter of the outer insulating layer 5.
In addition, since the outer conductor 4 is divided by the first cutting portion 8 and the insulating cyanoacrylate adhesive 9 is disposed in the first cutting portion 8, the terminal-side outer conductor 41 and the center-side outer portion are disposed. The conductors 42 are electrically insulated from each other. Therefore, even if the terminal portion of the terminal-side outer conductor 41 is electrically connected to the connection partner joint portion via the connection terminal 10, the center-side outer conductor 42 is electrically affected by the connection terminal 10. Can be difficult.

In addition, even if the outer diameter of the coaxial cable 1 is extremely thin, by using a fluororesin for the inner insulating layer 3 and the outer insulating layer 5 respectively, the insulation required for each insulating layer of the coaxial cable 1, The conditions of mechanical strength and chemical stability can be met. Further, the cyanoacrylate adhesive 9 includes the terminal-side inner insulating layer 31 and the center-side inner insulating layer 32, the terminal-side outer conductor 41 and the center-side outer conductor 42, and the terminal-side outer insulating layer 51 and the center-side outer insulating layer 52. When these are bonded, a certain adhesive strength required for the coaxial cable 1 can be satisfied.
Therefore, by using a fluororesin for each of the insulating layers 3 and 5 and using a cyanoacrylate adhesive 9 as a filling member, an extremely fine coaxial cable 1 can be formed.

Further, by connecting a ground wire or a connection line to the bias to the ground connection portion 14, the external conductor 4 and the ground wire, the bias, or the like can be electrically connected.
In addition, immediately after the first cut portion 8 is formed, the end-side inner insulating layer 31, the end-side outer conductor 41, and the end are disposed on the first cut portion 8 by disposing the cyanoacrylate adhesive 9. It is possible to prevent the side outer insulating layer 51 from shifting in the direction of the axis O, and to stabilize the dimensions of the end side of the coaxial cable 1.

In the present embodiment, as a modification thereof, as in the coaxial cable 20 shown in FIG. 6, the outer end of the outer conductor 4 and the outer insulating layer 5 are cut at the end portion and extended in the circumferential direction. One cut portion 21 may be formed, and a cyanoacrylate adhesive 22 may be disposed on the first cut portion 21. This is because the insulation between the terminal-side outer conductor 41 and the center-side outer conductor 42 can be ensured without cutting the inner insulating layer 3.
Further, like the coaxial cable 20, the terminal-side outer conductor 41 and the center-side outer conductor 42 are bonded with the cyanoacrylate adhesive 22 and then the terminal-side outer insulating layer 51 is removed from the coaxial cable 1. A connecting terminal 23 formed in a bottomed cylindrical shape is joined so as to cover the end surfaces of the inner conductor 2, the terminal-side inner insulating layer 31 and the terminal-side outer conductor 41, and the outer peripheral surface of the terminal-side outer conductor 41. May be.

Further, in the present embodiment, as another modification, as shown in FIG. 7, the through hole 42b and the through hole 52b formed in the center side outer conductor 42 and the center side outer insulating layer 52 are replaced with the center side outer conductor. 42 and the central outer insulating layer 52 may extend over the entire circumference.
In this case, the 2nd cutting part 26 is comprised by the through-hole 42b and the through-hole 52b. The center-side outer conductor 42 includes a first center-side outer conductor 42c disposed on the distal side of the second cutting portion 26, and a second center-side outer conductor 42d disposed on the center side of the second cutting portion 26. To be cut. Similarly, the center-side outer insulating layer 52 includes a first center-side outer insulating layer 52c disposed on the distal side from the second cut portion 26 and a second center-side outer disposed on the center side from the second cut portion 26. The insulating layer 52d is cut.
The ground connection portion 27 protrudes from the above-described connection portion main body 14a and the inner peripheral surface of the connection portion main body 14a and is disposed at the second cutting portion 26. The first center side outer conductor 42c and the second center side outer conductor And a projecting body 27b that is electrically connected to 42d.

(Second Embodiment)
Next, a second embodiment according to the present invention will be described. The same parts as those of the above-described embodiment are denoted by the same reference numerals, the description thereof will be omitted, and only different points will be described.
As shown in FIG. 8, the terminal structure of the coaxial cable 1 of the present embodiment has a shape in which two columnar shapes are connected in the direction of the axis O instead of the connection terminal 10 of the terminal structure of the first embodiment. The terminal 31 is provided with a connection terminal 31 whose outer diameter is set larger than the outer diameter of the central cylinder. The connection terminal 31 has a center-side surface of the center-side cylinder bonded to the end surfaces of the inner conductor 2, the inner insulating layer 3, the end-side outer conductor 41, and the end-side outer insulating layer 51.
Moreover, it is substantially tubular, the terminal side outer insulating layer 51 and the first center side outer insulating layer 52c are accommodated in the lumen, the connection terminal 31 is exposed on the end side end surface, and the center side is accommodated. An insulating support member 32 having an end face connected to the ground connection portion 27 is further included.

According to the terminal structure of the coaxial cable 1 of the second embodiment of the present invention configured as described above, the connection terminal 31 and the ground connection portion 27 are integrated by the support member 32, thereby connecting the connection partner. Can be easily.
Moreover, the terminal structure of the coaxial cable 1 can be protected by accommodating the terminal-side outer insulating layer 51 and the first center-side outer insulating layer 52 c in the lumen of the support member 32.

As mentioned above, although 1st Embodiment and 2nd Embodiment of this invention were explained in full detail with reference to drawings, the concrete structure is not restricted to this embodiment, The structure of the range which does not deviate from the summary of this invention Changes are also included.
For example, although the case where the coaxial cable 1 is an ultrafine coaxial cable has been described, the coaxial cable 1 may be a thicker coaxial cable than the ultrafine coaxial cable.

Moreover, although the cyanoacrylate adhesive was used as the filling member, a member such as an insulating resin may be used. In this case, by forming the connection terminal 10 on the terminal-side surface of the coaxial cable 1 and then forming the first cutting portion 8, the terminal-side inner insulating layer 31 and the terminal-side outer conductor 41 are formed with respect to the inner conductor 2. In addition, it is possible to prevent the terminal-side outer insulating layer 51 from shifting in the axis O direction.
In addition, since the communication signal can be transmitted in a place where there is little electromagnetic noise disturbance just by connecting the inner conductor 2, the second cutting portion and the ground connection portion are not provided in the first and second embodiments. Also good.

Next, an example in which the terminal structure of the coaxial cable 1 of the first embodiment is formed will be described.
First, the case where the terminal structure of the coaxial cable 1 from AWG 40 to AWG 46 (the outer diameter of the inner conductor 2 is about 0.08 mm to about 0.04 mm) is formed will be described.
The materials of the inner insulating layer 3 and the outer insulating layer 5 in this case are PFA (ethylene tetrafluoride-perfluoroalkyl vinyl ether copolymer resin), PTFE (tetrafluoroethylene resin), ETFE (tetrafluoroethylene-ethylene). A fluororesin such as a copolymer resin), a polyethylene resin such as PET, polyester, or the like was used.
Then, as the cyanoacrylate adhesive 9, front # 107 (trade name; manufactured by Four Front Co., Ltd.), which is an adhesive mainly composed of cyanoacrylate, was used together with a dedicated primer. In addition, as the cyanoacrylate-based adhesive 9, TB7781 or TB7784 (trade name; manufactured by Three Bond Co., Ltd.) can be used.
As a result of forming the terminal structure of the coaxial cable 1 using these materials, the conductors necessary as adhesives satisfy the conditions of insulation, mechanical strength and chemical stability required for each insulation layer. It was also found that a certain adhesive strength with each insulating layer was satisfied.

Next, the case where the terminal structure of the coaxial cable 1 thinner than the AWG 46 (the outer diameter of the inner conductor 2 is thinner than 0.04 mm) is formed will be described.
As the material for the inner insulating layer 3 and the outer insulating layer 5, a fluororesin such as PFA, PTFE, ETFE or the like was used. The front # 107 was used as a cyanoacrylate adhesive 9 together with a dedicated primer. As a result of forming the terminal structure of the coaxial cable 1 using these materials, it was found that each conductor and each insulating layer satisfy the required performance as described above.

Next, the case where the terminal structure of the coaxial cable 1 thicker than the AWG 40 (the outer diameter of the inner conductor 2 is larger than 0.08 mm) is formed will be described.
The materials of the inner insulating layer 3 and the outer insulating layer 5 are rubber (natural rubber, ethylene propylene rubber, silicone rubber), PVC (polyvinyl chloride), polyethylene (PET, etc.), PP (polypropylene), and the above fluororesin. Etc. were selected and used according to usage conditions such as application and purpose.
Then, as a result of forming the terminal structure of the coaxial cable 1 using the front # 107, TB7781 or TB7784 as the cyanoacrylate adhesive 9, each conductor and each insulating layer satisfy the required performance as described above. I understood that.

DESCRIPTION OF SYMBOLS 1 Coaxial cable 2 Inner conductor 3 Inner insulating layer 4 Outer conductor 5 Outer insulating layer 8, 21 First cut part 9, 22 Cyanoacrylate adhesive (filling member)
10, 23, 31 Connection terminal 13, 26 Second cutting part 14, 27 Ground connection part (connection part)
O axis

Claims (3)

In the terminal structure of the coaxial cable, the outer peripheral surface of the inner conductor is covered with an inner insulating layer, the outer peripheral surface of the inner insulating layer is covered with an outer conductor, and the outer peripheral surface of the outer conductor is covered with an outer insulating layer.
The coaxial cable extends in the circumferential direction of the coaxial cable and cuts at least the outer insulating layer and the outer conductor to divide the outer insulating layer and the outer conductor in the axial direction of the coaxial cable. A first cut is formed,
The first cutting portion is provided with a filling member having insulating properties,
A terminal structure of a coaxial cable, characterized in that a connection terminal made of a conductor that is electrically connected to the inner conductor and the outer conductor is provided on the end face of the coaxial cable. The terminal structure of the coaxial cable according to claim 1,
At least one of the inner insulating layer and the outer insulating layer is formed of a fluororesin,
A terminal structure of a coaxial cable, wherein the filling member is a cyanoacrylate adhesive. In the terminal structure of the coaxial cable according to claim 1 or 2,
In the coaxial cable, a second cut part is formed by cutting at least a part of the outer insulating layer in the circumferential direction on the side opposite to the terminal side from the first cut part,
A terminal structure of a coaxial cable, wherein the second cut portion is provided with a connecting portion made of a conductor that is electrically connected to the outer conductor.

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