JPS62252082A - Composition and manufacture of end of shielded cable - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a shielded cable (ribbon coaxial cable) used for computer wiring, etc., and more specifically to a cable end for connecting this cable to a connector. The present invention relates to the structure and manufacturing method thereof.

(Prior Art) Cables used for computer wiring etc. are often shielded cables because they are extremely sensitive to external noise. As such a shielded cable, for example, as shown in Fig. 4, a signal wire At
(Core wire) 1 covered with inner insulation coating 2 Covered wire 3
The drain wires 4 are arranged next to each other, and the coated wires 3
A shield wire is constructed by wrapping a drain wire 4 with a shield 5 made of aluminum foil, and a plurality of shield wires constructed in this way are arranged in parallel and covered integrally with an outer insulating coating 6. . The drain wire 4 is connected to the ground terminal,
This also connects the shield 5 to the ground, preventing noise from entering the signal wire 1 from the outside.

However, in the case of the above-mentioned shielded cable, since the shield is made of aluminum foil, the direct current resistance is relatively high and flexibility is difficult, so shielded cables that use copper wire instead of aluminum foil are recommended. thought out,
Specifically, as shown in FIG. 5, a coated wire 3 made by covering a signal wire (core wire) 1 with an inner insulation coating 2 is used.
A horizontally wound shield wire 7 made of multiple thin copper wires is placed around the
is spirally wound to form a shield, and a plurality of shield wires formed by winding the horizontally wound shield wire 7 in this way are arranged in parallel to the water damage, and the horizontally wound shield 117 is contacted next to each wire. A drain wire 4 is placed in this state, and in this state, it is integrally covered with an outer insulation coating 6 to form a shielded cable 10. When such a shielded cable 10 is used, since the shield is a copper wire, the direct current resistance is small, the intrusion of noise from the outside can be more reliably prevented, and the cable is easy to handle because it is flexible.

When using a shielded cable 10 shielded by a horizontally wound shielded wire 7 as shown in FIG. 5, a connector is connected to the end of this cable, and the cable 10 is connected to a mating device etc. Now that the connection is made, the method of connecting the end of the cable 10 to the connector will be described.

6A to 6B are diagrams sequentially showing the operation when exposing the signal wire 1 and drain wire 3 from the end of the shielded cable 10 and joining them to predetermined terminals of the connector.

First, as shown in FIG. 6A, the shielded cable 10
Only the outer insulation coating 6 is cut in a direction perpendicular to the wire axis at a distance d+ from one end 10a side toward the center.

That is, the outer insulation coating 6 is
Cut only. Next, the outer insulation coating 6 on the end side (one end 10a side) of the cut portion is removed, and as shown in FIG. 6B, the horizontally wound shielded wire 7 is unraveled, and it is divided into upper and lower parts to form coated wires. 3 and drain wire 4 are made to protrude forward. Then, cut the shield wire 7 divided into upper and lower parts, and use the remaining part as the 6th
It is folded back as shown in Fig. C, and then the inner insulation coating 2 of the covered wire 3 is removed to expose the signal wire 1 as shown in Fig. 6D. Next, each signal wire 1 is connected to each predetermined terminal of the connector 8, and the drain wire 4 is connected to the ground terminal of the connector 8.

(Problems to be Solved by the Invention) As described above, the end of the shielded cable 10 is joined to the connector 8, but in this case, the following problems may occur. First, as shown in FIG. 6B, when the horizontally wound shield ll1I7 is unraveled, the covered wire 3 and the drain wire 174 may come loose or each wire 3.4 may be bent. The pitch may shift. If the pitch of each wire 3.4 deviates, it will not match the pitch of each terminal of connector 8, and a problem arises in that it becomes difficult to join each terminal of connector 8 to each terminal as shown in FIG. 6E. Second, the pitch of the covered wires 3 is small, and the covered wires 3 are often close to each other, so that the horizontally wound shield wire 7 cannot be completely combed, and the horizontally wound shield wire 3 is placed between the covered wires 3. 7
There is a possibility that some of them may be left behind. In this way, if the shield wire 7 is left, there is a problem that the remaining shield wire 7 comes into contact with the signal wire 1 connected to each terminal of the connector 8, and the signal wire 1 is connected to the ground. There is. Thirdly, the horizontally wound shield wire 7 that has been loosened and cut as shown in FIG. There is a problem that there is a possibility that it may be connected to

(Means for solving the problems) The present invention was made in view of the above problems, and
The object of the present invention is to provide a shielded cable end structure and a manufacturing method thereof that do not cause the above-mentioned problems, and for this purpose, the following means are provided.

First, for the end structure, a certain length of the coated wire is exposed at the end of the shielded cable, and the outer insulation coating is cut from the exposed part toward the center in the longitudinal direction while covering the coated wire. The horizontally wound shield wire, which was disposed on the end side of the cut portion, is sandwiched between the removed outer insulating sheath and the remaining outer insulating sheath.

Furthermore, the manufacturing method of this end structure includes a step of removing a certain length of the outer insulation coating at the end of the shielded cable to expose the shield wire, and surrounding the outer periphery of each coated wire in the exposed shield wire. A process of unraveling the horizontally wound shield wire and cutting off the unraveled shield wire, and removing the outer insulation coating from the end of the shield wire with the outer insulation coating covering the shield wire at the center part in the longitudinal direction.
cutting at a right angle to the axial direction at a location to divide the first cut covering into a first cut covering located at the end side, a second cutting covering adjacent to the first cut covering, and the remaining insulation covering; and a step of moving the second cut coating to near the end of the exposed covered wire while covering the exposed covered wire, and the second cut coating moved as described above,
The exposed covered wire is moved to the center in the longitudinal direction in a covered state, and the exposed horizontally wound shield wire is placed between the remaining insulation coating and the exposed horizontally wound shield wire on the end side of the remaining insulation coating. The end structure is manufactured by performing these steps in this order.

(Function) According to the end structure of the shielded cable as described above, the unraveled horizontally wound shield wire is sandwiched between the cut outer insulation sheath and the remaining outer insulation sheath, so that the shield wire can be used for signal transmission. Contact with wires is prevented.

In addition, when manufacturing this end structure, the first and second cut coatings are moved to the vicinity of the exposed end of the covered wire, and then the second cut coating is returned to the center side. By the second cut sheath, the horizontally wound shield wire left behind the exposed covered wire can be pushed out toward the center and sandwiched between the second cut sheath and the remaining insulation sheath, and the exposed wire can be sandwiched between the second cut sheath and the remaining insulation sheath. No horizontally wound shield wire remains between the covered wires. Also, since the first cutting sheath is located at and covers the exposed end of the sheathed wire, this maintains a constant pitch of the sheathed wire.

(Example) Hereinafter, preferred examples of the present invention will be described based on the drawings.

FIGS. 1A to 1H are diagrams sequentially showing a method for manufacturing a shielded cable end structure according to the present invention. First, one end 10a of the shielded cable 10 shown in FIG.
Only the outer insulating coating 6 is cut in a direction perpendicular to the wire axis at a position a predetermined distance Ll from (J3 in FIG. 1A, indicated by a chain line). Next, the outer insulation coating 61 on the end side (one end 10a side) of this cut portion is removed, and the first
As shown in Figure B, the horizontally wound shield wire 7 is loosened and sorted into upper and lower sections so that only the covered wire 3 and the drain wire 4 protrude forward. Then, as shown in FIG. 1C, the shield wires 7 separated into upper and lower sections are separated. At this time, there is no problem even if the length of the part that is left after being cut off is long to some extent, and by removing the part to a certain extent in this way and cutting it off, it becomes easier to automate this work.

Next, only the outer insulation coating 6 is removed at a distance L2 from its end.
The cut outer insulation coating, that is, the first cut coating 62, is cut to the left in the figure while covering the coated wire 3. It is moved and positioned at the end of the coated wire 3 as shown in FIG. 1D. Thereafter, only the remaining outer insulation coating 6 is cut in a direction perpendicular to the wire axis at a distance II L 3 from the end thereof (position indicated by aa in FIG. 1D), and this cut outer insulation coating is That is, the second cutting coating 63 is moved to the left in the figure while covering the coated wire 3, and is positioned in a position where it is in contact with the first cutting coating 62, as shown in FIG. 1E. Next, this time the second
The cut sheath 63 is reversely moved to the right and returned to a position close to the remaining outer insulation sheath 6, as shown in FIG. 1F.

In this way, the horizontally wound shield 17 that was exposed to the outside is pushed by the second cut vi 63 and the first
As shown in Figure F, it is sandwiched between the second cut coating 63 and the remaining outer insulation coating 6. At this time, the horizontally wound shield I is inserted between the coated wires 3! 7 is also the second
Since it is pushed out to the left by the cutting cover 63, the first F
In the illustrated state, no horizontally wound shield wire 7 is left between the exposed covered wires.

Thereafter, the horizontally wound shield wire 7 is cut off leaving a predetermined length and folded back to the center as shown in FIG. 1G. In addition, the exposed length L4 of the shield wire 7 during separation and erosion at this time is:
If the length of the second cut sheath 63 is made smaller than the length L3, even if the folded shield wire 7 returns to its original state, the shield IQ7 will pass over the second cut sheath G3 and move toward the coated wire 3. Therefore, contact between the shield wire 7 and the signal wire 1 can be reliably prevented. Note that in the steps shown in FIGS. 1D to 1G, the first cut coating 62
Covered wire 3 with exposed J3 and drain wire 4
Since the wires 3 and 4 are held by covering their tips, it is possible to prevent the pitches of the wires 3 and 4 from shifting.

For this purpose, as shown in FIG. 1H, the distal end side coating 2 of the coated wire 3 is removed and the coated wire 3 is bonded to each terminal of the connector.

FIGS. 2 and 3 are diagrams showing a state in which the end portion of the shielded cable 10 manufactured as described above is joined to the connector 20. FIG. The connector 20 includes a plurality of contacts 22 that are held together side by side by a holder 25 that is insert-molded with resin or the like, and the contacts 2.
a main housing 21 formed at one end of 2 and housing and holding a septacle part 23;
It consists of upper and lower cover housings 26a and 26b that are attached to the main housing 21 and cover the rear part of the main housing 21. In addition, in FIG. 1, the upper and lower cover housings 26a and 26b are removed. A holder 25 is attached to the rear part of the main housing 21, and a joining piece 24a formed at the other end of the contact 22 projects from the holder 25 in the contact direction. Some of these joint pieces 24a are used for grounding, and extend diagonally downward and are integrally connected to a ground piece 24b extending in the width direction. In order to connect the shielded cable 10 to the connector 20 configured in this way, the upper and lower cover housings 26a and 26b are removed, and each signal wire 1 of the shielded cable 10 is connected to the connecting piece 24'a.
The drain wires 4 are all connected to the ground piece 24b. In this way, the upper and lower cover housings 26a are covered to cover this joint.
26b to the main housing 21. At this time, the shielded cable 10 has upper and lower housings 26a,
26b, the shielded cable 10
Even if a tensile force is applied to the wire, the clamping portion stops receiving the tensile force so that the tensile force does not act on the joint between the signal wire 1 and the drain wire 4.

A case where the connector 20 is attached to the end of the shielded cable 10 as described above and the case where this connector 20 is connected to the mating terminal 30 will be described. The mating terminal 30 includes a plurality of plug terminals 32 provided on a base 31 in correspondence with the pitch of the septacle portions 23 of the contacts 22 held in the main housing 21 . Therefore, when the connector 20 is pressed against the mating terminal 30, the plug terminal 32 is pushed into the receptacle portion 23 as shown in FIG.
The two are connected to each other.

(Effects of the Invention) As explained above, according to the present invention, the exposed horizontally wound shield wire is sandwiched between the cut outer insulation coating (second cut coating) and the remaining outer insulation coating. Therefore, contact between the shield wire and the signal wire can be prevented.

In this case, if the length of the shield wire exposed to the outside and folded back is made shorter than the axial length of the second cut sheath, even if the folded shield wire returns to its original state, the second cut sheath remains intact. There is no possibility of touching the signal wire beyond the
Contact between the shield wire and the signal wire can be reliably prevented. Furthermore, when manufacturing the above-mentioned end structure, the second cut coating is moved to a part and then returned to the center side. The shield wires left between the wires can be pushed out together to the center, so no shield wires remain. Furthermore, since the first cutting sheath is located at and covers the exposed end of the sheathed wire, it is possible to prevent the sheathed wire from unraveling or bending and shifting its pitch. .

[Brief explanation of drawings]

1A to 1H are perspective views sequentially showing a method for manufacturing the end structure of a shielded cable according to the present invention, and FIGS. 2 and 3 are perspective views showing a state in which the shielded cable according to the present invention is connected to a connector. Figures and sectional views; Figure 4 is a cross-sectional perspective view showing a conventional shielded cable; Figure 5 is a cross-sectional perspective view showing a shielded cable used for manufacturing the end structure of the present invention; Figures 6A to 6E are FIG. 2 is a perspective view sequentially illustrating a conventional method of manufacturing an end portion of a shielded cable. 1... Signal wire 2... Inner insulation coating 3.
...Coated wire 4...Drain wire 6...
・Outer insulation coating 7...Horizontally wound shield wire 10・
... Shield cable 20 ... Connector 22 ...
Contact 30...Mating terminal 62...1st
Cutting cover 63...Second cutting wi cover 1A prisoner 1D figure 1E figure 1F figure 1G figure old figure 2 figure 3

Claims (1)

[Claims] 1) A shielded wire in which the core wire is covered with an inner insulating coating, and the outer periphery of the covering part of the coated wire is surrounded by horizontally wound shielded wires, and a plurality of the shielded wires are arranged parallel to each other at predetermined intervals. An end structure of a shielded cable consisting of an outer insulating sheath that is held together in a horizontally lined state, wherein the sheathed wire is exposed at the end of the shielded cable, and the sheathed wire is exposed at the end of the shielded cable, and the sheathed wire is exposed at the end of the shielded cable, and the sheathed wire is exposed at the end of the shielded cable, and the sheathed wire is exposed at the end of the shielded cable, and the sheathed wire is exposed at the end of the shielded cable, and the sheathed wire is exposed at the end of the shielded cable, and the sheathed wire is exposed at the end of the shielded cable. The outer insulation coating is cut to a predetermined length in the axial direction while covering the plurality of coated wires, and the outer insulation coating is placed between the cut outer insulation coating and the remaining outer insulation coating on the end side from the cut portion. A shielded cable characterized in that the above-mentioned horizontally wound shielding cable, which had previously been used, is sandwiched. 2) A shielded wire in which the core wire is covered with an inner insulating coating, and the outer periphery of the sheathed part of the coated wire is surrounded by horizontally wound shielded wires, and a plurality of the shielded wires are arranged horizontally in parallel with each other at predetermined intervals. A method of manufacturing a shielded cable end structure comprising an outer insulating sheathing and an outer insulating sheath that is integrally held together with the shielded cable, the outer insulating sheathing being removed by a certain length at the end of the shielded cable to expose the shielded wire. a step of unraveling the horizontally wound shield wire surrounding the outer periphery of each coated wire in the exposed shield wire and cutting off the unraveled shield wire; Cut the end part at right angles to the axial direction at two places on the longitudinal center side, and cut the first cut covering located closest to the end, the second cut covering adjacent to the first cut covering, and the remaining part. a step of moving the first and second cut sheaths, while covering the exposed covered wire, to near an end of the exposed covered wire; The second cut sheath that has been moved is moved to the center side while covering the exposed covered wire, and is placed between the second cut sheath and the remaining insulation sheath on the end side of the remaining insulation sheath. A method for manufacturing an end structure of a shielded cable, characterized in that the step of holding the exposed horizontally wound shield wire is carried out in the above order.