JP2544247Y2 - Coaxial cable connection structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a connection structure between a conductor of a coaxial cable and a terminal such as a substrate.

[Related Art] A coaxial cable in which an insulator, an outer conductor, and an insulation jacket are sequentially coated on the outside of a center conductor is widely used as a connection path of a high-frequency line because of its low attenuation and excellent crosstalk characteristics. Have been. In general, a coaxial connector is used to connect the coaxial cable to a device having a high-frequency circuit. For example, in recent medical devices that are required to have high performance and downsizing, a large number of ultrafine coaxial cables are used. Must be connected closely. In this case, instead of using the coaxial connector, a board is used in which a terminal and a ground terminal form a pair arranged in the longitudinal direction of the coaxial cable, and a large number of these terminal pairs are arranged on the surface.

At the time of connection, the terminal portion of the coaxial cable is subjected to a terminal treatment in advance by the process shown in FIG. 2, and the center conductor and the outer conductor are soldered and fixed to the terminal of the board and the ground terminal at the terminal portions thereof. It has become so.

First, the first step is as shown in FIG.
An annular cut is made from the outside at a predetermined position of the terminal portion of the above, and the insulating jacket 11 is removed to a predetermined length to expose an outer conductor 12 formed of a braided or spirally wound metal wire. next,
In the second step, as shown in (b), the outer conductor 12 is twisted and divided into the outer conductor side and the center conductor side. The third step is
As shown in (c), the twisted outer conductor 12 is
Harden with Subsequently, as shown in (d), a cut is made at a predetermined position of the insulator 14 as a fourth step, and the cut is removed.
The central conductor 15 is exposed. In the final fifth step, as shown in (e), the end of the outer conductor 12 fixed by the solder 13 is cut in accordance with the terminal position of the substrate to be connected, and the length is cut.
Further, when the center conductor 15 is a stranded wire, this is also solidified with the solder 13 similarly to the outer conductor 12.

As shown in FIG. 3, a large number of coaxial cables 10 subjected to the terminal treatment are connected to a center conductor 15 and an outer conductor.
Each end of 12 is connected to the terminal 21 and the ground terminal 22 of the board 20 by solder 13, respectively.

[Problem to be solved by the invention] In the conventional terminal processing method, not only is the workability inferior due to the large number of steps as described above, but also when the outer diameter of the coaxial cable is reduced and high-density wiring is advanced. However, there is a problem that the risk of short-circuit between the center conductor 15 and the outer conductor 12 increases. If the center conductor 15 and the outer conductor 12 are not properly connected to each other, particularly when the center conductor 15 has a small outer diameter, when the tension is applied to the cable, stress is concentrated on the center conductor 15 and the wire is disconnected. Therefore, it is difficult to adjust the cutting length of the outer conductor 12 and the fixing position.

Therefore, in the present invention, in view of such a problem of the conventional technology, terminal processing is easy, and even when many small-diameter coaxial cables are densely wired and connected to a substrate or the like, a short circuit occurs between conductors. It is an object of the present invention to provide a connection structure for a coaxial cable that is free from stress and is less likely to concentrate stress on the center conductor.

Means for Solving the Problems In order to achieve the above object, in the connection structure for a coaxial cable according to the present invention, a thin coaxial cable in which an insulator, an outer conductor, and an insulating jacket are sequentially coated on the outside of a center conductor. Is a connection structure of a coaxial cable for connecting a large number of terminals to the correspondingly arranged terminals and the ground terminal at a high density, wherein the terminal portion of the coaxial cable connected to the terminal and the ground terminal is The insulator, the outer conductor, and the insulation jacket are cut by making annular cuts so that the center conductor, the insulator, and the outer conductor are sequentially exposed, and the cut insulator and the outer conductor are removed. Having an exposed center conductor portion and an exposed insulator portion formed in the same manner as described above, and being formed so as to be shifted toward the cable terminal end so as to cover and arrange the cut end portion of the cut outer end portion of the outer conductor. And the exposed outer conductor portion and the exposed center conductor portion in a state where the cut insulating jacket is disposed between the exposed outer conductor portion and the exposed center conductor portion. Are connected to the ground terminal and the terminal, respectively.

[Operation] The outer conductor of the coaxial cable is formed by winding a metal foil such as a copper foil or an aluminum foil on an insulator, or by braiding or spirally winding a thin metal wire. When these outer conductors are cut and removed at the time of terminal treatment, the ends are apt to be separated, so in the conventional method, after cutting and removing the insulating jacket,
Requires soldering.

On the other hand, in the present invention, a plurality of annular cuts are made at the cable end so that the center conductor, the insulator, and the outer conductor are sequentially exposed inward from the end side thereof, and the cut insulator piece is formed. Of the outer conductor piece and the insulation jacket piece, the insulation jacket piece located on the portion to be the exposed portion of the outer conductor was shifted to a position where the opposite terminal side portion covers the terminal side portion of the outer conductor exposed portion. A coaxial cable is used which is left in a state and is formed in a termination structure from which other cut pieces are removed. In this case, the end portion of the exposed portion of the outer conductor is held by the insulating jacket piece from the outside, and does not fall apart. For this reason, the conventional operation of bundling the external conductors and solidifying them with solder is not required. Furthermore, since the terminal portion of the outer conductor exposed portion is covered from outside by the insulating jacket piece, by adjusting the position where the insulating jacket piece is left,
It is not necessary to cut the outer conductor in accordance with the position of the terminal to be connected. Therefore, the coaxial cable formed in the terminal structure can be directly solder-fixed at each of the exposed portions, so that the efficiency of the connection operation is greatly improved.

Further, according to the above connection structure, the cut insulating jacket piece remains between the exposed outer conductor and the center conductor, so that there is a great effect in preventing a short circuit between the two, and tension is applied to the cable. In such a case, the outer conductor exposed portion integral with the cable receives the outer conductor and is not directly loaded on the center conductor, so that the center conductor is hardly broken.

Next, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a side view showing a connection structure of a coaxial cable according to the present invention. The illustrated coaxial cable 1 has a center conductor 2, an insulator 3, a spirally wound layer of a thin metal wire as an outer conductor 4, and an insulating jacket. 5.

First, in the terminal portion of the coaxial cable 1, annular cuts having different depths are respectively made from the outside at three places in the axial direction, and the center conductor 2 and the insulator 3 are arranged inward from the end side of the cable 1 in the axial direction. Then, the insulator 3, the outer conductor 4, and the insulating jacket 5 are cut so as to be exposed in the order of the outer conductor 4. next,
Of the cut insulator piece, outer conductor piece, and insulation jacket piece, the insulation jacket piece 5a positioned on the exposed portion 4a of the outer conductor 4 is connected to the exposed outer conductor portion. Leave in a state shifted to a position covering the terminal side portion of 4a, and remove all other cut pieces.

The connection structure according to the present invention comprises a central conductor exposed portion 2a and an external conductor exposed portion 4a of the coaxial cable 1 having the above-mentioned terminal shape.
Are connected and fixed to the terminal 21 and the ground terminal 22 of the substrate 20 by solder 13, respectively. The terminal 21 and the ground terminal 22 form a pair arranged in the longitudinal direction of the coaxial cable 1. A large number of the terminal pairs are arranged on the surface of the substrate 20.

In the connection structure fixed in this manner, the end portion of the outer conductor exposed portion 4a is wrapped by the insulating jacket piece 5a, and the thin metal wires do not fall apart. There is no need to bundle and harden with solder,
In addition, the end of the outer conductor exposed portion 4a is connected to the ground terminal 22 of the substrate 20.
Since there is no need to cut in accordance with the position, the efficiency of the connection operation is greatly improved. In addition, the exposed outer conductor
Since the insulating jacket piece 5a exists between the outer conductor 4a and the exposed portion 2a of the center conductor 2, there is a great effect in preventing short circuit between the two. Since there is no direct load on the center conductor 2 received, disconnection of the center conductor 2 hardly occurs.

In order to form the terminal structure, for example, first, a cut is made at the position B in FIG. 1 to cut and remove the insulating jacket 5 and the outer conductor 4, and then the insulator 3 is cut at the position A to form the center conductor. 2 is exposed, and finally a cut is made at the C position, and the insulating jacket piece 5a is shifted in the cable terminal direction to a position where the opposite terminal side portion covers the terminal side portion of the outer conductor exposed portion 4a. Further, as another method, the insulating jacket 5, the outer conductor 4, and the insulator 3 are cut and removed at the position A,
Next, the insulation jacket 5 and the outer conductor 4 may be cut and removed at the position B to expose the insulator 3, and finally a cut may be made at the position C to similarly shift the insulation jacket piece 5a halfway.
The formation method can be arbitrarily selected.

In the embodiment, the cable end side of the insulating jacket piece 5a is located on the insulator 3. However, depending on the cutting length of the insulating jacket piece 5a, it is located on the exposed portion 2a of the center conductor 2. It is also possible to make appropriate changes according to the distance between terminals of a substrate or the like to be connected.

[Effects of the Invention] As described above, in the connection structure of a coaxial cable according to the present invention, the coaxial cable is such that the center conductor, the insulator, and the outer conductor are sequentially exposed inward from the terminal end toward the cable end. A plurality of annular cuts are made, and among the cut pieces formed by the annular cuts, the insulating jacket piece located on the outer conductor exposed portion, the position where the non-terminal side portion covers the terminal side portion of the outer conductor exposed portion In this case, use a terminal structure in which the outer conductor is left shifted and the other cut pieces are removed.Therefore, when connecting a large number of small-diameter coaxial cables to a substrate, etc. There is no need to bundle and harden with solder, and it is not necessary to cut the end portion of the external conductor in accordance with the position of the terminal to be connected, so that the workability is greatly improved.

Further, according to the connection structure, the cut insulating jacket piece remains between the exposed outer conductor and the center conductor, so that there is a great effect in preventing a short circuit between the two. , The tension is not directly applied to the center conductor, which is very effective in preventing the disconnection.

In the above embodiment, the example in which the outer conductor is formed by spirally winding a thin metal wire is described.However, the present invention is not limited to this, and application to a braid of a thin metal wire, a longitudinal attachment of a metal foil, a spiral winding, or the like is also possible. Of course, it is also possible to connect a coaxial cable that has been terminated to the above shape to something other than the substrate.

[Brief description of the drawings]

FIG. 1 is a side view showing a coaxial cable connection structure according to the present invention, FIG. 2 is a side view showing a conventional coaxial cable terminal processing method, and FIG. 3 is a side view showing a conventional coaxial cable connection structure. . 2,15: center conductor, 3,14: insulator, 4, 12: outer conductor, 5, 11: insulating jacket, 5a: insulating jacket piece.

Continuation of the front page (56) References JP-A-56-83211 (JP, A) JP-A-54-131772 (JP, A) Jpn.

Claims (1)

(57) [Scope of request for utility model registration] 1. A large number of small-diameter coaxial cables in which an insulator, an outer conductor, and an insulation jacket are sequentially coated on the outside of a center conductor.
A connection structure of a coaxial cable connected to a correspondingly disposed terminal and a ground terminal at a high density, wherein a terminal portion of the coaxial cable connected to the terminal and the ground terminal includes the center conductor and the insulation. The insulator, the outer conductor, and the insulating jacket are each cut by making an annular cut so that the body and the outer conductor are sequentially exposed, and the exposed portion formed by removing the cut insulator and the outer conductor. A central conductor portion and an exposed insulator portion, and an exposed outer conductor portion formed so as to be shifted in a cable termination direction so as to cover and dispose the cut insulation jacket on the cut end portion of the outer conductor. The exposed outer conductor and the exposed center conductor are connected to the ground terminal and the terminal in a state where the cut insulating jacket is disposed between the exposed outer conductor and the exposed center conductor. Connection structure of the coaxial cable, characterized in that it is connected.