JPH0552633B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention provides a method for fixing shielded wires, which is very effective when, for example, collectively connecting shielded wires of wires consisting of a group of coaxial cables having thin wire shields, and The present invention relates to a fixing member used for that purpose.

[Conventional technology and problems]

In recent years, OA equipment, ME equipment, and the like have become more and more sophisticated and smaller, and the electric wires that are wired to them are also becoming thinner and more densely packaged.

Electrical wires wired to such precision equipment generally have a coaxial structure with an external shield in order to avoid malfunctions and crosstalk caused by external noise. In high-density mounting as described above, as shown in FIG.
The usual method is to connect the shields of the respective coaxial shielded electric wires 1, 1 to a ground wire and ground them all together.

However, if the installation space is limited due to restrictions on the structure of the equipment, the above method of connecting the ground wire all at once may not be applicable;
If the shield wire was extremely thin, there was a risk of the wire breaking when an external force was applied to the inner core.

Therefore, if there is a possibility that the shield wire may break, as shown in Figure 2,
The shield wire 3,
The method used has been to attach one of the three wires and solder them together.

In addition, in Fig. 2, 1 is an electric wire with a shield wire,
2 is an exposed core, 4 is a terminal, 5 is a fixing base (connector housing), and S is a protective coating.

However, as shown in FIG. 2, it takes a huge amount of time to wrap the shield wires 3, 3 around the ground bar 6, and the ground bar 6 has a certain amount of mechanical resistance against external forces. Since it is necessary to maintain high strength, the diameter must also be thick, and a large heat capacity is required when soldering the shield wire at the end, and this heat There was a considerable risk that the insulation of the inner core would melt and cause short circuits or poor withstand voltage.

Furthermore, when the shield wires 3, 3 are tied to the ground bar 6 as described above, care is taken to make the lengths of the internal parts 2, 2 uniform in advance so that the finished appearance is orderly. While carrying out the karage work, due to unbalanced tension during the work, the core lengths that were supposed to be aligned inevitably become uneven, and some cores are subjected to too much tension and break, or There were also drawbacks such as some loosening and intersecting adjacent cores, worsening crosstalk characteristics.

On the other hand, there is a method in which a shielded wire is tied to the ground bar and then a crimp terminal is crimped and fixed to the tip of the shielded wire instead of soldering, and then inserted into the housing of the multi-pole connector.
It is difficult to match the pitch between adjacent poles of the housing with the pitch between the shielded wires connected to the ground bar, which not only worsens the appearance but also causes undesirable results such as worsening of crosstalk, which we have already seen. There was a tendency to create.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned circumstances, and it is possible to ground the shielded wires all at once by a simple means, and also to align the cores and distribute the tension evenly, so that they can be fixed in an orderly manner from the outside. The present invention aims to provide a method for fixing a shielded electric wire and a fixing member directly used therefor.

[Summary of the invention]

The method for fixing a shielded electric wire of the present invention uses a fixing base having a large number of storage recesses, and a fixing support having a large number of notches corresponding to each of the storage recesses of the fixing base, The terminal of the grounding piece is housed and fixed in a part of the storage recess selected for the fixed base, and the extended end of the grounding wire of the grounding piece is inserted into a part of the notch of the fixed support to fix the fixed support. At the same time, the terminals of each core of a plurality of shielded electric wires are stored and fixed in the storage recess left for the fixed base, and each exposed core is loosened. Wrap a conductive tape around the fixed support and fix it in place, and attach the extended end of the ground wire and the exposed shielded wire to the conductive tape. It is characterized by being integrated by soldering.

Further, the fixing member directly used in this fixing method includes a fixing base having a large number of storage recesses for storing and fixing the terminal of the grounding piece and the terminal of each core of the plurality of shielded electric wires; The fixed support has a number of notches corresponding to the storage recesses of the fixed base and for inserting the ground wire of the grounding piece and the bare core of the shielded electric wire, and the fixed support that is wrapped around the fixed support and has a ground The present invention is characterized by comprising a conductive tape for collectively soldering the extended end of the wire and the exposed and separated shield wire of the shielded electric wire.

According to the method and fixing member for fixing shielded wires, it is possible to ground the shielded wires of a plurality of shielded wires at once very easily and accurately, and also to ground each core in an orderly manner with proper pitch and tension. The alignment can be fixed.

〔Example〕

FIG. 1 is an explanatory diagram showing how a plurality of shielded coaxial electric wires 1, 1 are fixed by the fixing method according to the present invention.

A large number of coaxial type electric wires 1, 1 are collected and the sheath S of the electric wire protected by a collective sheath S is stripped off in steps, and the shielded wires 3, 3 and the core are further removed at each end of the coaxial type electric wires 1, 1. 2,2
are exposed, terminals are attached and terminated at the ends of the cores 2, 2 as described later, and the shield wires 3, 3 are terminated at positions retracted from the ends of the cores 2, 2. It is processed.

In order to fix the coaxial electric wires 1 and 1 with shielded wires that have been terminated, a fixing base 5 for storing terminals and an exposed core 2 are placed at a predetermined distance (A in the figure) from this fixing base 5. , 2 are used to hold them in alignment.

As shown in FIG. 5, the fixing base 5 is a connector housing having a large number of storage recesses 5a arranged in a row, and some of the storage recesses are selected to connect the terminals on the grounding piece 9. (4 in Figure 4)
I try to store and secure it.

One fixed support 8 has a plate-like shape as shown in FIG. 3, and has notches 8a on both longitudinal sides in which exposed cores (2 in FIG. 1) of the coaxial electric wire are appropriately engaged. A notch 8b is formed in the grounding piece 9, with which the grounding wire 9a is suitably engaged.

As shown in FIG. 4, this grounding piece 9 has a terminal 4 crimped and connected to one end of the grounding wire 9a, and by storing and fixing the terminal 4 in a selected storage recess of the fixing base 5. , a ground wire 9a is extended to the outside of the fixed base 5. The extended portion of the ground wire 9a is covered with an insulator 9b to a length corresponding to the distance A between the fixed base 5 and the fixed support 8. Doing so will aid in accurate placement of the fixed support 8 later.

FIG. 5 shows the fixed base 5 with the grounding piece 9 already assembled as described above.
A terminal attached to the core of the coaxial electric wire is stored and fixed in the remaining storage recess 5a.

FIG. 6 shows the state of termination of the coaxial electric wires 1, 1. Strip the outer insulator 1a and remove the inner core 2.
The core 2 and the surrounding shield wire 3 are exposed and separated, and the core 2 is exposed at a dimension B slightly longer than the length A of the insulator 9b of the grounding piece, and the terminal 4 is crimped and connected at the end. The shield wires 3 are pulled together and separated at a position retreated by the exposed length B of the core 2.

The electrical fibers 1, 1 which have been terminated as described above are housed and fixed by inserting each terminal 4 into the remaining heat absorption recess 5a of the fixing base 5, as shown in FIG. A bare core 2 is extended from a fixed base 5.

FIG. 8 shows the arrangement of the fixed support 8 with respect to the exposed core 2 of the electric wire and the ground wire 9a of the grounding piece that extends outside by storing and fixing the terminal on the fixed base 5 as described above. As already explained in FIG. 3, the fixed support 8 is provided with notches 8a and 8b corresponding to the storage recesses 5a of the fixed base 5, so that the fixed support 8 is arranged so that each core 2 is arranged in two rows. In the separated state, the ground wire 9a is inserted into the notch 8a so as to pass in a straight line, and the exposed core 2 is inserted into the notch 8b so as to pass through the notch 8b in a straight line.

The fixed support 8 into which the ground wire 9a and the plurality of cores 2, 2 have been inserted as described above is placed on the end surface of the insulator (9b in FIG. 4) provided on the ground wire 9a with a predetermined length A. Then, it will be placed opposite to the fixed base 5 at a predetermined distance, that is, at a position separated by the length A of the insulator. Since each core 2 has an exposed length B that is slightly longer than the length A of the insulator, when the parting edge of the shield wire 3 is adjacent to the surface portion of the fixed support 8, a slight slack is provided.

Connect the ground wire 9a and each core 2, 2 as described above.
As shown in FIG. 9, a copper tape with an adhesive layer 10, which serves as a conductive tape, is wrapped around and fixed to the fixed support 8, which serves as a conductive tape, on the side surface including the notches 8a and 8b. The end portion is folded back to the outside of the copper tape 10 to make electrical contact. This causes the fixed support 8 to connect to the ground wire 9a.
It is held in place without falling off.
Furthermore, although the shield wires 3, 3 are bent above the fixed support 8 in this figure, they are also placed so as to be in contact with the outside of the copper tape 10.

Finally, by soldering the ground wire 9a and each shield wire 3, 3 to the copper tape 10, the shield wires 3, 3 are collectively electrically connected to the copper tape 10, and the ground wire 9a Enables collective grounding through

FIG. 10 shows a state in which the soldering has been completed as described above, and the external appearance has been trimmed by cutting off the excess portions of the ground wire 9a and each of the shield wires 3, 3. By soldering as described above,
The fixed support 8 is supported by the ground piece 9 and positioned and fixed, and each core 2 is fixed to the fixed support 8 and the fixed base 5 with a predetermined slack between them. Aligned and routed.

[Action/effect of the invention]

As detailed above, according to the method for fixing shielded wires and the fixing member according to the present invention, each of the exposed and separated shielded wires of a plurality of shielded wires is wrapped with a conductive tape around a fixed support. Since the heat capacity during soldering can be reduced, soldering can be completed in a short time, and there is little heat effect on the internal core.
Problems such as poor withstand voltage and short circuits can be resolved.

The terminal provided at the tip of the exposed core of the shielded electric wire is stored and fixed in the storage recess of the fixing base, and the grounding piece extending from the terminal stored and fixed in the storage recess of the fixed base is grounded. Extending exposed cores with a predetermined slack are inserted into the notches of the fixed support placed at regular intervals through the wires, and the exposed and separated shield wires are inserted into conductive cores wrapped around the fixed support. The exposed core (rising part) is fixed by soldering to the tape, so even if the shield wire is bent, the exposed core remains approximately straight with a certain amount of slack between the fixing base and the fixed support. It can be extended close to
Since no extreme bending or tension is applied to the bare core, the stress applied to the core itself is minimal, preventing wire breakage.In addition, the multiple exposed cores are arranged at equal intervals without excessive loosening, and the shield wire The deterioration of crosstalk characteristics required for this purpose is reliably suppressed.

Since the exposed cores are arranged in an orderly manner between the fixed support and the fixed base, the appearance also improves in appearance.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing the external appearance of the fixed part of the shielded wire according to the present invention, Fig. 2 is an explanatory diagram showing the external appearance of the fixed part of the conventional shielded wire, and Fig. 3 is an explanatory diagram showing the external appearance of the fixed part of the shielded wire according to the present invention. FIG. 4 is an explanatory diagram showing an example of the configuration of a grounding piece, FIG. 5 is a perspective explanatory diagram showing an example of a fixing base according to the present invention, and FIG. 7 to 1 are front views showing the termination processing status of the shielded electric wire in the invention.
FIG. 0 is an explanatory diagram showing step-by-step an example of the fixing method according to the present invention. In the symbols, 1 is an electric wire with a shielded wire, 2 is an exposed core, 3 is an exposed and separated shielded wire, 4 is a terminal, 5 is a fixing stand, 5a is a storage recess, 8
8a is a fixed support, 8a is a notch, 9 is a grounding piece, 9a is a grounding wire, and 10 is a conductive tape (copper tape).

Claims (1)

[Scope of Claims] 1. A fixed base having a large number of storage recesses and a fixed support having a large number of notches corresponding to each of the storage recesses of the fixed base. Store and fix the terminal of the grounding piece in a selected part of the storage recess, insert the extended end of the grounding wire of the grounding piece into a part of the notch of the fixed support, and attach the fixed support to the fixed base. At the same time, the terminals of each core of a plurality of shielded electric wires are housed and fixed in the storage recesses left in the fixing base, and each exposed core is placed in a fixed support with some slack. Insert it into the remaining notch, wrap a conductive tape around the fixed support and fix it, and solder the extended end of the ground wire and the exposed and separated shield wire of the shielded wire to this conductive tape. A method for fixing a shielded electric wire. 2. A fixing base with a large number of storage recesses for storing and fixing the terminals of the grounding piece and the terminals of each core of multiple shielded wires, and a fixing base that corresponds to the storage recess of the fixing base and A fixed support with many notches for inserting the exposed core of the ground wire and the shielded wire, and a fixed support that is wrapped around the fixed support to separate the extended end of the ground wire and the exposed core of the shielded wire. A member for fixing electric wires with shielded wires, comprising a conductive tape for collectively soldering the shielded wires.