JPH0565994B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a shielded cable (ribbon coaxial cable) used for computer wiring, etc., and more specifically to a shielded cable (ribbon coaxial cable) used for wiring a computer, etc. It's about structure.

(Prior Art) Cables used for computer wiring, etc. are often shielded cables because they are extremely sensitive to external noise. For example, as shown in FIG. 4, such a shielded cable is constructed by arranging a drain wire 4 next to a coated wire 3 formed by covering a signal wire (core wire) 1 with an inner insulation coating 2, 3 and drain wire 4 are wrapped in a shield 5 made of aluminum foil to form a shield wire, and a plurality of shield wires thus constructed are arranged in parallel and integrally covered with an outer insulating coating 6. There is something made. The drain wire 4 is connected to a ground terminal, thereby also connecting the shield 5 to the ground, thereby 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 horizontally wound shield wire 7 made of a plurality of thin copper wires is placed around a coated wire 3 made by covering a signal wire (core wire) 1 with an inner insulation coating 2.
A shield is constructed by winding the horizontally wound shield wire 7 in a spiral, and a plurality of shield wires formed by winding the horizontally wound shield wire 7 in this way are arranged horizontally in parallel, and a horizontally wound shield wire 7 is placed next to each wire. A drain wire 4 is disposed in contact with the cable, 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, and the intrusion of noise from the outside can be more reliably prevented, and since the cable is flexible, it is easy to handle.

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. The method for connecting the end of the cable 10 to the connector will be explained.

6A to 6B are diagrams sequentially showing the operation of exposing the signal wire (core 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, only the outer insulation coating 6 is cut at a distance _d1 from one end 10a of the shielded cable 10 toward the center in a direction perpendicular to the wire axis. That is, only the outer insulation coating 6 is cut along the one-dot chain line in the figure. Next, the outer insulation coating 6 on the end side (one end 10a side) of the cut portion is removed, and the horizontally wound shield wire 7 is loosened as shown in FIG. And only the drain wire 4 is made to protrude forward. Then, the shield wire 7 that has been sorted vertically is cut, the remaining portion is folded back as shown in Fig. 6C, and then the inner insulation coating 2 of the coated wire 3 is removed as shown in Fig. 6D. expose. 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,
First, as shown in FIG. 6B, when the horizontally wound shield wire 7 is unraveled, the coated wire 3 and the drain wire 4 may come apart or each wire 3, 4 may be bent, causing the pitch of each wire 3, 4 to be distorted. may shift. If the pitch of each wire 3, 4 is misaligned, it will not match the pitch of each terminal of connector 8, and
A problem arises in that it becomes difficult to connect the connector 8 to each terminal as shown in Figure E. Second,
The pitch of the covered wires 3 is small, and each covered wire 3
They are often close to each other, and for this reason, the horizontally wound shield wire 7 may not be completely unraveled, and a portion of the horizontally wound shield wire 7 may remain between the covered wires 3. 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 unraveled and cut as shown in FIG. There is a problem that it may be connected to ground.

(Means for Solving the Problems) The present invention was made in view of the above-mentioned problems, and an object thereof is to provide an end structure of a shielded cable that does not cause the above-mentioned problems. For this purpose, the following measures are in place.

First, as 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 off from the exposed part toward the central part in the longitudinal direction while still covering the coated wire.
The horizontally wound shield wire, which was disposed on the end side of the cut portion, is sandwiched between the cut outer insulation coating and the remaining outer insulation coating.

Furthermore, the manufacturing method of the top end structure includes the steps 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 exposed shield wire around the outer periphery of each coated wire. The step of unraveling the horizontally wound shield wire and cutting off the unraveled shield wire, and removing the outer insulation coating at two points on the longitudinal center side from the end thereof at right angles in the axial direction while the outer insulation coating covers the shield wire. cutting into a first cut coating located at the end side, a second cut coating adjacent to the first cut coating, and the remaining insulation coating, and dividing the first and second cut coating into , a step of moving the exposed covered wire in a covered state to near an end of the exposed covered wire;
The second cut sheath that has been moved as described above is moved toward the center in the longitudinal direction while covering the exposed covered wire, and is placed between the second cut sheath and the remaining insulation sheath so that the end portion is closer to the end than the remaining insulation sheath. It is characterized by comprising a step of clamping the exposed horizontally wound shield wire arranged on the side, and manufacturing the end structure 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 coated wire, and then the second cut coating is returned to the center side. By the second cut coating, the horizontally wound shield wire left between the exposed covered wires can be pushed out toward the center and sandwiched between the second cut coating and the remaining insulation coating, No horizontally wound shield wire remains between exposed coated wires. Also, since the first cutting sheath is located at and covers the exposed ends 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, only the outer insulation coating 6 is cut in a direction perpendicular to the wire axis at a position a predetermined distance L1 from one end 10a of the shielded cable ₁₀ shown in FIG. 5 (the position indicated by the chain line in FIG. 1A). Next, the outer insulation coating 61 on the end side (one end 10a side) of this cut portion is removed,
As shown in FIG. 1B, 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 a certain extent, and by leaving a certain length of the part to be cut off in this way, it becomes easier to automate this work.

Next, only the outer insulation coating 6 is cut in a direction perpendicular to the wire axis at a distance L ₂ from the end thereof (the position indicated by the chain line in FIG. 1C), and this cut outer insulation coating, that is, the first cut coating 62
is moved to the left in the figure while covering the covered wire 3, and positioned at the end of the covered 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 L ₃ from its end (the position indicated by the chain line in FIG. 1D), and the cut outer insulation coating 6 is The second cutting coating 63 is moved to the left in the figure while covering the covered wire 3, and is positioned in contact with the first cutting coating 62, as shown in FIG. 1E. Next, the second cut sheath 63 is now 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 wire 7 that was exposed to the outside is pushed by the second cut sheath 63, and the second cut sheath 63 and the remaining outer insulation sheath 6 are separated from each other as shown in FIG. held between. At this time, the horizontally wound shield wire 7 inserted between the covered wires 3 is also pushed to the left by the second cut covering 63, so in the state shown in FIG. 1F, the horizontally wound shield wire 7 inserted between the exposed covered wires 3 No wound shield wire 7 is left behind.

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. Note that the exposed length L ₄ of the shield wire 7 after separation at this time is the length L ₃ of the second cut coating 63.
If the shield wire 7 is made smaller, even if the folded shield wire 7 returns to its original state, this shield wire 7
does not reach the coated wire 3 beyond the second cut coating 63, and contact between the shield wire 7 and the signal wire 1 can be reliably prevented. In addition, 1st D
In the steps shown in FIGS. 1G to 1G, the first cut coating 62 covers and holds the exposed tips of the covered wire 3 and drain wire 4, so that the pitch of each wire 3, 4 is shifted. This can be prevented. After that, as shown in FIG. 1H, the distal end side coating 2 of the coated wire 3 is removed,
This can be joined to each terminal of the connector.

FIGS. 2 and 3 show how the end of the shielded cable 10 manufactured as described above is connected to the connector 20.
It is a figure showing the state where it was made to join. connector 20
is a holder 2 in which resin etc. is insert-molded.
5, a main housing 21 that houses and holds a plurality of contacts 22 that are horizontally aligned and integrally held together, and a receptacle portion 23 formed at one end of the contacts 22;
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. 2, 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 joint piece 24a formed at the other end of the contact 22 projects rearward from the holder 25. 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, 26
b is removed and each signal wire 1 of the shielded cable 10 is joined to the joining piece 24a,
Connect each drain wire 4 to the ground piece 24
Join to b. After joining in this way, cover the upper and lower cover housings 2 to cover this joint.
6a and 26b are attached to the main housing 21. At this time, the shielded cable 10 is held between the rear parts of the upper and lower housings 26a and 26b, and even if a tensile force is applied to the shielded cable 10, this tensile force is absorbed by the holding part and the joint between the signal wire 1 and the drain wire 4 is This tensile force is not applied to the

After the connector 20 is attached to the end of the shielded cable 10 as described above, a case will be described in which the connector 20 is connected to the mating terminal 30. The mating terminal 30 includes a plurality of plug terminals 32 provided on a base 31 in correspondence with the pitches of the receptacle 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 second
As shown in the figure, the plug terminal 32 is fitted into the receptacle portion 23 so that the two are connected.

(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 the signal wire coming into contact with the shield wire, and 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 the edge and then returned to the center, so that when the second cut coating is returned, the second cut coating is moved back to the center. As a result, the shield wires left between the covered wires can be pushed out to the center, and no shield wires remain. In addition, since the first cutting sheath is located at and covers the exposed end of the sheathed wire, the sheathed wire may come apart,
This can prevent the pitch from shifting due to bending.

[Brief explanation of the drawing]

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. 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 shielded cable of the present invention, and Figures 6A to 6A are cross-sectional views. 6E
The figures are perspective views sequentially showing a conventional method of manufacturing the end portion of a shielded cable. DESCRIPTION OF SYMBOLS 1... Signal wire (core wire), 2... Inner insulation coating, 3... Covered wire, 6... Outer insulation coating, 7... Horizontally wound shield wire, 10... Shield cable.

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 sheathed part of the coated wire is surrounded by horizontally wound shielded wires; An end structure of a shielded cable consisting of an outer insulating sheath that is integrally held in a lined up 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, 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 arranged between the cut outer insulation coating and the remaining outer insulation coating on the end side from the cut part. An end structure of a shielded cable, characterized in that the horizontally wound shielded wire is clamped.