JPH01298667A - Method of forming branch connection of cable - Google Patents

Abstract

PURPOSE:To form the branch connection of a cable easily and certainly by providing two exposed parts in the cable, protruding a signal conductor or an earthing conductor, and rotating and bending the cable so that the earthing conductor is laid on the upper side. CONSTITUTION:An insulating coat 2 of a cable 1 is removed in two places A, B in the longitudinal direction to make a core 3 exposed. The core 3 is formed of a plurality of signal conductors 3a and earthing conductors 3b provided on the both sides thereof. The signal conductor 3a and the earthing conductor 3b are protruded toward the lower side while maintaining the continuous state. Then, the expose parts A, B, and the insulating coat part 12 are rotated against the insulating coat part 11, bent up to the upper side and overlapped to each other so that the signal conductor 3a is protruded on the side surface of the coat part 11 and the earthing conductor 3b is laid on the upper side. Under this condition, the protruded part is connected to the table part of the corresponding terminal of the connector body, whereby branching of the cable can be conducted easily and certainly.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a method for forming a branch connection of a cable such as a flat cable. This invention relates to a method for forming an electrical branch connection when connecting to the tail portion of a terminal of a connector body.

[Prior art] In the case of high-speed signal transmission between the main body of a large computer and peripheral devices, it is necessary to improve the connection reliability of the signal line connector, increase the mounting density of the board, reduce the number of relay boards, and In order to reduce reflection and crosstalk noise due to impedance mismatch, efforts are underway to reduce the number of connectors by connecting signal branching connectors to the middle of high-speed signal cables.

When branching the middle part of a high-speed signal transmission cable,
For example, as shown in FIG. 7, the cable may be cut into two cable sections 101 and 102 to form unconnected cable sections 101 and 102, or originally two separated cable sections 101 and 102 may be used. , the respective signal lines 105 and 106 and the ground line 1 exposed by removing the insulation coatings 103 and 104 of the two cable parts 101 and 102.
07.108 is welded to the tail part 110 of the signal terminal and the tail part 111 of the ground terminal of the connector main body part 109 for branch connection to form a branch connection (for example, 61-114671).

[Problems to be Solved by the Invention] In the case of this type of prior art, it is time-consuming because it is essentially necessary to cut the cable at the branch connection. Moreover, in forming each branch connection, it is necessary to connect two wires to the respective terminals, so there are many connection points, and there is a risk that a connection failure will occur or it is difficult to avoid the need for time and effort.

This external point increases further by m as the number of connectors and/or the number of wires per cable increases.

The present invention has been made in view of the above points, and an object thereof is to provide a branch connection forming method that can easily and reliably form a cable branch connection.

[Means for Solving the Problems] According to the present invention, the above-mentioned problem is achieved by removing the insulation coating of the cable including the signal line and the grounding line at two locations in the middle of the cable in the longitudinal direction. exposing the wire at the two locations; and, while maintaining each of the signal wire and the ground wire in a continuous state, protruding the signal wire at one of the exposed locations and protruding the ground wire at the other exposed location. a step of bending the cable at the protruding point of the exposed signal line and overlapping the cable portion having the insulating sheathing part; This is achieved by a cable branch connection method that automatically connects the cables.

[Operations and Effects of the Invention] In the branch connection forming method of the present invention, in particular, the insulation coating of the cable including the signal line and the ground line is removed at the longitudinally intermediate portion 211A, and the signal line and the ground line are connected to each other. a step of exposing the signal line at two locations, and while maintaining each of the signal line and the ground line in a continuous state, protruding the signal line at one of the exposed locations and protruding the ground line at the other exposed location; There is a step of bending the cable at the protruding point of the exposed signal line and overlapping the cable portion with the insulating sheath, so there is no need to cut the cable at the branch connection. It doesn't take much effort.

Moreover, in forming each branch connection, it is only necessary to connect each exposed/protruding wire at the bent end to the corresponding terminal one-to-one, so the number of connection points can be minimized and there is no risk of connection failure. This reduces the amount of time it takes to connect. Therefore, even if the number of connectors and/or the number of wires per cable increases, branch connections of cables can be
It can be formed easily and reliably.

[Embodiment] Next, as a preferred embodiment and a modification of the present invention, a method for branching and connecting flat cables will be explained based on FIGS. 1 to 6. Note that instead of a flat cable, the cable may be, for example, a thin rod coaxial cable consisting of one signal line and one ground line.

First, as shown in Figure 2, the PT of flat cable 1 is
The insulating coating 2 made of FE (polytetrafluoroethylene) or the like is removed at two longitudinal intermediate portions A and B indicated by imaginary lines using, for example, a CO2 laser to expose the core wire 3. The insulation coating may be any other material, for example ETFE (ether tetrafluoroethylene),
Other fluororesins such as FEP (fluorinated polyethylene propylene), foamed fluororesins, or polyolefins such as polyethylene may be used. Further, the insulation coating may be removed by other thermal means, mechanical means, or chemical means.

Although only one core wire 3 is visible in FIG. 2, as can be seen from the perspective view of FIG. 1, a plurality of signal wires 4.
It consists of a plurality of ground wires 6.7.8.9.10@, one numbered on both sides of each signal wire. Signal lines 4, 5
, the grounding wires 6, 7.8, 9° 10, and the exposed locations at portions A and B of the core wire 3 representing these as a whole are as follows:
Respectively, codes 4a, 5a, 6a, 7a, 8a, 9a, 10
a.

3a, and numbers 4b, 5b, 6b, 7k), 8b.

9b, 10b, and 3b (note that in FIGS. 1 to 6, only some of these lines are shown, so some of them do not have corresponding symbols in the drawings). The lengths C1D of the exposed portions 3a and 3b of the core wire 3 may be approximately the same, or one may be longer than the other (COD or C<D).

Next, the signal wires 4, 5, etc. of the plurality of core wires 3 are connected so as to protrude at the exposed parts 4a, 5a, and the ground wires 6, 7, 8
．． 9.10 mag exposed area 6b.

7 b, 8 b, 9 b, 10 bvr; At the same time, push it down or push it down so that it protrudes from the side, and deform it as shown in FIG. 3.

At this time, the lengths C and D between the covering portions 11 and 12 and 13 become shorter as one or the other exposed portion corresponding to each line protrudes. Instead of ejecting a plurality of core wires at the same time, it may be performed several times in batches.

(This ejection method itself is also described in, for example, U.S. Pat. No. 4,722,692, Mei IQ.

) Next, in order to bend the cable 1 at the core 1a3a of the exposed part A, the entire sheathing part 12.13 and exposed core part 3b of the cable 1 are folded into the protruding ground wire parts 6b, . . . 10b.
Rotate in the E direction with respect to the covering part 11 so that
The entire sheathing 12.13 and exposed portion 3b of the cable 1 is superimposed on the sheathing 11 of the cable. In addition, in FIG. 4, the reference numeral 14a.

These are exposed portions at portions A and B (not shown in FIG. 1). After this folding, the signal wires 4.5.14 are bent and formed at their protruding exposed portions 4a, 5a, and 14a into a shape suitable for connecting to the signal terminals of the connector as described later (here, for the sake of simplification of the explanation). Therefore, the number of N lines is 3.
We will explain the example of a tree, but the number of wires may be 4 or more or 2 trees). By this bending and forming, the protruding end portions 16 and the like of the signal line 14a etc. are positioned such that their lower sides 17 are located on substantially the same plane as the upper surface 18.19 of the covering portion 12.13. At this time, if desired, the grounding wires 6.7, 8.9.10.15 may also be formed into a predetermined shape.

This forming may be performed by simply clamping using an appropriate jig or by bending.

In addition, during or before or immediately after this forming, the distance between the covering parts 11, 12, 13 is adjusted so that the exposed part A
The interference of the ground wire 15a, etc. at the exposed portion B may be minimized, and the length of the signal ID 14b, etc. at the exposed portion B may be minimized.

Next, as shown in FIG.
, 8b; 9b, 10b: Opening 2 at the part corresponding to 15b.
Common grounding metal plate 2 provided with 0.21.22.23
4 is placed #C on the folded body 25 shown in FIG. 4, and as shown by the imaginary line in FIG. connected to. In such a case, the finger portions 27 extending from both sides or one side of the ground plate 24 and the forming ends 16 of the exposed portions 4a, 5a, 14 of the signals [14, 5, 14, etc.] are aligned in a line with the connector body portion 28. The tail portions 30a, 31a of the corresponding terminals 30, 31, 32, 33, etc. arranged
32a, 33a, etc., are electrically connected and fixed by soldering or welding 26, etc.

In addition, in FIG. 1, for ease of viewing the drawing, the signal lines 4a,
The protruding ends of the terminals 30, 31, 32, etc. of the connector main body 28 are used by bending and elongating the finger portions 27 of the ground plate 24, and using the protruding ends of the terminals 30, 31, 32, etc. of the connector main body 28 without forming them. , 31a, 32a
An example is shown in which the formed core wire ends are placed on the tails of the terminals of the connector main body 28 as shown in FIG. It is more preferable to connect and fix.

In the cable assembly 35 formed as described above, when connecting the connector main body part 28 to the intermediate part of the cable 1,
Since it is not necessary to cut the core wire 3 of the cable 1, the number of core wires that need to be connected to the tail portion of the terminal of the connector body 28 is halved compared to the conventional example shown in FIG. 7, reducing the number of man-hours required for connection. reliability can be increased. Moreover, the exposed portions of the signal line and the ground line are located at the respective portions 4b, 5b, 14b.
6a, 7a, 8a, 9a, 10a, 15a, but also parts 4a, 58. Reflection of the transmission signal at the branch connection due to variations in impedance at and near the branch connection can be reduced. Furthermore, since the number of connections is minimized, this cable assembly can be made compact and allows for high density packaging.

The couple assembly or branch connection portion 35 formed as described above is then embedded and fixed in resin together with the connector main body to form a connector 36 as shown in FIG. 6. Since this connector is integrally molded entirely from resin, it can be made smaller. FIG. 6 shows a cable having three connectors 36a, 36b, 36c formed in this way integrally. In the case of Figure 6, there are three connectors 368.36t), 36CG, t
, and complementary connectors or headers 37a, respectively.

It is directly connected to a plurality of substrates or motherboards 38a, 38b, and 38c that constitute a part of the computer main body or its peripheral devices, etc. via 37b and 37c.

In addition, the cable assembly 35 or the connector 36 formed as described above can also use existing parts as most of its parts.

[Brief explanation of the drawing]

FIG. 1 is a perspective explanatory view of a branch connection formed by a method according to a preferred embodiment of the present invention, and FIGS.
2, 4 and 5 are explanatory diagrams of the portion corresponding to the left side view of FIG. 1, and FIG. 3 is an explanatory diagram of the formation process of the branch connection in FIG. A cross-sectional explanatory diagram of a portion corresponding to the m-line (however, the examples in FIGS. 2 to 5 differ from the example in FIG. 1 in that the exposed end of the signal line is formed),
FIG. 6 is an explanatory diagram of an example in which a connector including a branch connection formed according to the present invention is connected to three mother boards, and FIG. 7 is an explanatory diagram of a conventional method of forming a branch connection. 1...Cable, 4,5.14...Signal line, 6.
7.8.9.10.15...Grounding wire, 4a, 4b, 5
a, 5b. 14a, 14b...Signal line exposed portions, 6a, 6b, 7a, 7b. 3a, sb, 9a, 9b. 10a, 10b, 15a, 15b...Grounding wire exposed portion 11.12.13...Insulating coating portion, 30.31.32.33...Terminal portion of connector body.

Claims (1)

[Claims] removing the insulating sheath of the cable including the signal line and the ground line at two locations in the middle of the cable in the longitudinal direction to expose the signal line and the ground line at the two locations; and keeping each of the signal line and the ground line in a continuous state. the signal line is made to protrude from one of the exposed places while the grounding wire is made to protrude from the other exposed place, and the cable is bent at the protruding part of the exposed signal line to remove the insulation coating. 1. A method for forming a branch connection of a cable, the method comprising the steps of: overlapping the cable portions having the exposed signal wire and the exposed ground wire; and electrically connecting the protruding portions of the exposed signal wire and the exposed ground wire to the tail portions of the corresponding terminals of the connector body.