JP2003045240A - Shield flat cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shield flat cable in which the core wire of the drain wire is not loosened at pressure contacting or before that. SOLUTION: The flat cable is constructed of a drain wire 23 and one or more of insulating core wires 22 that are arranged in parallel on the same plane, a conductive shield 24 that are formed on these, and an insulating body 25 that covers the shield 24. The drain wire 23 comprises a conductor 28 and a conductive conduction resin part 29 that covers the conductor 28. Further, it is preferable that the diameter of the drain wire 23 is formed to coincide with the diameter of the insulating core wire 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shielded flat electric wire, and more particularly to a shielded flat electric wire having an improved drain wire.

[0002]

2. Description of the Related Art FIG. 2 is a cross-sectional view for explaining the structure of a conventional shield flat electric wire. Conventionally, a shield flat electric wire 1 as shown in FIG. 2 is generally known. The shield flat electric wire 1 has conductors 2 and 2.
Insulating cores 4 and 4 in which the insulators 3 and 3 are covered, a drain wire 5 made of only a conductor, and a shield 6 integrally covering these.
And a sheath 7 coated on the shield 6. The insulating wire cores 4, 4 and the drain wire 5 are arranged in parallel on the same plane with a predetermined space therebetween, and the shield 6 has a front surface and a back surface in which the insulating wire cores 4, 4 and the drain wire 5 are orthogonal to the above plane. It is formed by being sandwiched by the shielding metal tapes 8 from the direction.

FIG. 3 is a top view showing a state in which the conventional shield flat electric wire configured as described above is subjected to an end treatment before being pressure-welded to a pressure-welding connector. In FIG. 3, the press-connecting connector 9 connected to the end of the shielded flat electric wire 1 is in a press-contacted state in which the housing 10 made of synthetic resin, the insulating wire cores 4 and 4 and the drain wire 5 (see FIG. 2) are pressed. The pressure contact terminals 11, 11, and 11 are connected to each other. Further, the housing 10 is formed with a plurality of pressing portions 12 that prevent the insulating cores 4 and 4 and the drain wire 5 (see FIG. 2) from coming off. On the other hand, the end of the shield flat electric wire 1 is the bridge portion 13 between the drain wire 5 (see FIG. 2) and the adjacent insulating wire core 4.
After a slit is formed in the insulating wire cores 4 and the sheath 7 and the shield 6 on the insulating wire cores 4 and 4 are peeled off by a cutting machine or the like, they are pressed and connected to a pressure contact connector 9.

[0004]

In the above-mentioned prior art, however, the following problems are present in the portion surrounded by the dotted line in FIG. 3 after the end treatment of the shield flat electric wire 1. . That is, after the skin is stripped,
There is a problem in that the adhesive force of the shield 6 remaining on the drain wire 5 is weakened and peeled off, and the core wire of the drain wire 5 disperses before the pressure contact of the pressure contact connector 9.

In addition, in order to deal with the above problems, the drain wire 5
Was constructed with a known pressure contact conductor, but satisfactory results could not be obtained with respect to vibration and bending characteristics in an environment such as an automobile engine room. Therefore, under the present circumstances, there is a possibility that the drain wire 5 may vary unless a single-core wire is used.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a shield flat electric wire in which the core of the drain wire does not vary during or before the pressure contact.

[0007]

A shield flat electric wire according to the present invention, which has been made to solve the above-mentioned problems, comprises a drain wire and one or a plurality of insulating cores arranged in parallel on the same plane. A shielded flat electric wire comprising a conductive shield formed on the drain wire and one or a plurality of insulating cores, and an insulator coated on the shield, wherein the drain wire is It is characterized by having a conductor and a conductive conductive resin portion coated on the conductor.

A shield flat electric wire according to a second aspect of the present invention is the shield flat electric wire according to the first aspect, wherein the diameter of the drain wire is formed in accordance with the diameter of the insulating core. There is.

A shield flat electric wire according to a third aspect of the present invention is the shield flat electric wire according to the first or second aspect, wherein the conductive resin portion is a thermoplastic resin or an elastomer resin mixed with a conductive filler. It is characterized by doing.

According to the invention described in claim 1,
The drain wire is configured to have a conductor and a conductive resin portion. Since the conductive resin portion has conductivity, it does not impair the intended function of the drain wire. As a result, even if the shielded flat electric wire is subjected to the terminal treatment, the conductive resin portion covers the conductor, so that the conductor of the drain wire is reliably prevented from varying. It should be noted that the conductor of the drain wire includes a single-core wire (because the present invention can prevent the variation and can also stabilize the work during press contact).

According to the present invention described in claim 2,
The connection partner, for example, the pressure contact terminal of the pressure contact connector can be shared. It is also possible to facilitate the work during pressure contact.

According to the present invention described in claim 3,
By mixing the thermoplastic resin or the elastomer resin with the conductive filler, the function originally intended for the drain wire is maintained.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of the shield flat electric wire of the present invention.

In FIG. 1, a shielded flat electric wire 21 of the present invention comprises an insulating core 22, 22, 22 and a drain wire 2.
3, the shield 24, and the sheath 25. The insulating cores 22, 22, 22 and the drain wire 23 are arranged in parallel on the same plane with a predetermined interval.
The insulated wire core 22 includes a conductor 26 and an insulator 27 covering the conductor 26 (insulated wire core 2).
2 is the same as the conventional one, and the description thereof is omitted. The number of the insulated wire cores 22 is not limited to the number in the figure, but one, two,
It may be four or more). Further, the drain wire 23 is configured to have a conductor 28 made of a stranded wire and a conductive resin portion 29 coated on the conductor 28.

As the conductor 28 of the drain wire 23, a flexible conductor is used. The conductor of the flexible structure is, as shown in JASO D 611,
Compared with the wire diameter of a general stranded wire, it refers to a wire having excellent bending characteristics, which is formed by twisting a number of finer wires. Although the present invention is not limited to the use of such a conductor 28, a conductor having a flexible structure can improve vibration and bending characteristics as compared with the conventional one, and the environment in the engine room can be improved. It is a preferable mode because it can be sufficiently dealt with.

The conductive resin portion 29 of the drain wire 23 has conductivity. That is, the conductive resin portion 29 is formed by mixing the thermoplastic resin or the elastomer resin with the conductive filler. Here, the thermoplastic resin is P
P, PE, PVC, etc. shall be mentioned as an example. In addition, examples of the elastomer resin include EPDM, silicone, and NBR. Further, the conductive filler is carbon, Cu, N
i, Ag, etc. are given as examples.

Although not limited to this, in the present embodiment, the drain wire 23 is manufactured by the same manufacturing method as that of the insulating wire core 22 having a known structure. Also, drain line 2
The diameter of 3 is formed according to the diameter of the insulating core 22.

The shield 24 is formed by using, for example, a pair of upper and lower shield metal tapes 30, 31.
Only the drain wire 23 is electrically connected in a state where the plurality of insulating wire cores 22 and the drain wire 23 are integrally covered. Further, the shield 24 is formed with a plurality of line shield portions 32 and a shield bridge portion 33 continuous with the line shield portions 32. That is, in the drawing, the line shield portions 32 are formed so as to be in close contact with the outer surfaces of the insulator 27 of each insulated wire core 22 and the conductor 28 of the drain wire 23. In addition, the leftmost insulated wire core 22 and the second insulated wire core 22 from the left, the second insulated wire core 22 from the left, the third insulated wire core 22 from the left, and the third insulated wire core 22 from the left in the figure. Between the insulated wire core 22 and the drain wire 23, a shield bridge portion 33 is formed which is bonded to each other and connects between the adjacent wires.

The shield metal tapes 30 and 31 forming the shield 24 are metal foils provided with an adhesive layer, and specifically, a shield copper-coated aluminum polyester tape or the like is used. In addition to the pure metal foil such as copper foil, those having a reinforcing layer such as resin can be used as the metal foil.

The sheath 25 is the same as the conventional one, and is made of an insulating synthetic resin. The sheath 25 is formed so that its cross section is circular so that it has a uniform thickness. Incidentally, the sheath 2
5 shall correspond to the insulator described in the claims.

As described above, the shield flat electric wire 2 of the present invention
In No. 1, since the drain wire 23 is configured to have the conductor 28 and the conductive resin portion 29, it is possible to reliably prevent the conductor 28 from varying even if the shield flat electric wire 21 is subjected to end treatment. Further, since the drain wire 23 is configured to have the conductor 28 and the conductive resin portion 29, the function originally intended for the drain wire 23 can be maintained. Further, since the diameter of the drain wire 23 is formed in accordance with the diameter of the insulating wire core 22, it is possible to share a connection partner, for example, a pressure contact terminal of a pressure contact connector, and to facilitate work during pressure contact. it can.

In addition, the above-mentioned terminal treatment is performed by a plurality of insulated wire cores 2.
2 and the sheath 25 and the shield 24 on the drain wire 23
Shall be stripped by a cutting machine or the like (slightly different from the conventional one. Needless to say, since the sheath 25 and the shield 24 on the drain wire 23 are not left, the workability for stripping is improved). .

In addition, it goes without saying that the present invention can be modified in various ways without departing from the spirit of the present invention.

[0024]

As described above, according to the present invention as set forth in claim 1, the conductive resin portion of the drain wire covers the conductor of the drain wire. There is an effect that it can be surely prevented.

According to the present invention described in claim 2,
For example, the pressure contact terminal of the pressure contact connector can be commonly used. Further, there is an effect that the work at the time of pressure contact can be facilitated.

According to the present invention described in claim 3,
By mixing the thermoplastic resin or the elastomeric resin with the conductive filler, it is possible to maintain the function originally intended for the drain wire and to reliably prevent the conductor of the drain wire from being distorted.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of a shielded flat electric wire according to the present invention.

FIG. 2 is a cross-sectional view for explaining the configuration of a shielded flat electric wire of a conventional example.

FIG. 3 is a top view showing a state in which a terminal treatment is performed before the shield flat electric wire of FIG. 2 is pressed against a press contact connector.

[Explanation of symbols]

21 Shield flat electric wire 22 Insulated wire core 23 Drain wire 24 shield 25 sheath (insulator) 26 conductors 27 Insulator 28 conductors 29 Conductive resin part 30, 31 Shield metal tape 32-wire shield 33 Shield bridge

Claims (3)

[Claims] 1. A drain wire and one or more insulating wire cores arranged in parallel on the same plane, a conductive shield formed on the drain wire and one or more insulating wire cores, A shield flat electric wire comprising an insulator coated on a shield, wherein the drain wire comprises a conductor and a conductive resin portion coated on the conductor. Shielded flat electric wire. 2. The shield flat electric wire according to claim 1, wherein the diameter of the drain wire is formed so as to match the diameter of the insulating core. 3. The shield flat electric wire according to claim 1, wherein the conductive resin portion is formed by mixing a thermoplastic resin or an elastomer resin with a conductive filler. .