JPH0715051Y2 - Flat cable shield structure - Google Patents

Description

[Detailed Description of the Invention] [Outline] The present invention relates to a shield structure of a flat cable, and more particularly, to a flat cable in which a plurality of core wires are covered with a shielding member having an inner surface as a metal surface and an outer surface as a non-metal surface. In order to provide an excellent flat cable, a plurality of core wires are covered with a shield member having a metal surface on one surface and a non-metal surface on the other surface, and an adhesive material is applied to the joint portion. In the flat cable fixed with
A flat cable shield structure characterized in that the metal surfaces of the shield member are adhered to each other to cover a plurality of core wires, and the joints thereof are fixed by an adhesive material.

[Industrial application field]

The present invention relates to a flat cable shielding method, and more particularly to a flat cable in which a plurality of core wires are covered with a shielding member having an inner surface of a metal surface and an outer surface of a non-metal surface.

2. Description of the Related Art In recent years, flat cables have been well known as those used for interconnection of computers and the like. As is well known with this flat cable, the core wires are joined in a ribbon shape, and the inner conductor 2a and the insulator 2 are respectively inserted from the core wire side.
b, an outer conductor 2c, a jacket 2d, and a plurality of them (generally referred to as a coaxial multicore cable 2) assembled into a film-shaped shielding member 1 (for example, a non-metal It is composed of a material such as aluminum vapor-deposited on). On the other hand, what is most important in such a flat cable is noise that enters the cable from the outside of the cable, and various measures have been taken so far as measures against this noise.

[Conventional technology]

The conventional flat cable shield structure is shown in Figs.
It will be described with reference to the drawings.

FIG. 3 is a diagram showing a first conventional shield structure, and FIG. 4 is a diagram showing a second conventional shield structure.

As a first conventional technique, as shown in FIG. 3, the coaxial multi-core cable 2 is covered with a film-shaped shield member 1 having a metal vapor deposition surface on the inside and a non-metal vapor deposition surface on the outside. In addition, one end portion of the film-shaped shield member 1 is configured to project outward, and the projecting portion is tilted substantially parallel to the outer side of the film-shaped shield member 1 to form the joint portion 1a. The adhesive 3 made of insulating resin was used for fixing.

As a second conventional technique, as shown in FIG. 4, the coaxial multi-core cable 2 is covered with the shield member 1 so as to be aligned from the vertical direction in FIG. The joint portion 1a was fixed by the insulating resin adhesive material 3.

[Problems to be solved by the device]

However, in the prior art shown in FIG. 3, the metal vapor deposition surface and the non-metal vapor deposition surface overlap each other, and the joint portion is also an adhesive of an insulating resin between the non-metal vapor deposition surface and the metal vapor deposition surface. Since it is fixed in the state of interposing the cable (this point is the same in FIG. 4), the nozzle intrudes from the outside of the cable from this joint, which has a drawback that it adversely affects signal communication. .

Therefore, an object of the present invention is to provide a flat cable having an excellent shield effect.

[Means for Solving the Problems]

Such an object is a flat cable in which a plurality of core wires are covered with a shield member 1 having one surface being a metal surface and the other surface being a non-metal surface, and the joint 1a thereof is fixed with an adhesive 3. , The metal surfaces of the shield member 1 are adhered to each other to cover the plurality of core wires, and a joint portion thereof
This is achieved by a flat cable shield structure in which 1a is bent and fixed by the adhesive 3.

[Operation] The present invention utilizes the fact that an excellent shielding effect can be obtained when metals such as aluminum are brought into close contact with each other. Noise from the outside of the cable does not enter from the vicinity of the joint 1a of the shield member 1.

〔Example〕

 An embodiment of the present invention will be described below with reference to FIG.

The shield structure of the present invention is a film-like structure having a metal vapor deposition surface (aluminum or other vapor deposition surface) on the inside and a non-metal vapor deposition surface (insulating member) on the outside, as in FIG. 3 described above. The coaxial multi-core cable 2 is covered with a shield member 1 so as to wrap it from the outside. Then, the metal vapor deposition surface of the shield member 1, that is, the surfaces on the coaxial multicore cable 2 side are brought into close contact with each other, and the joint portion 1a thereof is tilted so as to be parallel to the transverse direction of the cross section of FIG. Then, the joint portion 1a is fixed with an adhesive 3 made of an insulating resin.

However, although the technique of FIG. 1 can sufficiently obtain the effect of the shield, in FIG. 1, when the cable is peeled off for some reason, the metal deposition surface appears on the surface, so that this portion is not exposed. There is the drawback that noise interference occurs when other metals come into contact.

Therefore, as shown in FIG. 2, the metal vapor-deposited surface of the shield member 1, that is, the surfaces on the coaxial multicore cable 2 side are brought into close contact with each other and are aligned parallel to the transverse direction of the cable in FIG. Before the joint portion 1a is pushed down so that the joint portion 1a is folded down, the joint portion 1a is folded back and pressure-bonded, and then fixed with the adhesive 3 of the insulating resin. With the configuration as shown in FIG. 2, the possibility of the peeling state occurring is smaller than that in FIG. 1, and it is possible to provide the one having excellent insulation properties.

〔The invention's effect〕

As described above, according to the present invention, since the metal surfaces are completely in close contact with each other, noise is prevented from entering the inside of the cable from the outside of the cable. Also, by folding back the shield member and fixing it with an adhesive, the metal surface does not appear on the outer circumference of the cable, so even if the cable is peeled off, it will not be connected to other metal, so it has excellent insulation properties. .

[Brief description of drawings]

FIG. 1 is a view showing an embodiment of the present invention, FIG. 2 is a view showing another embodiment of the present invention, FIG. 3 is a view showing a first conventional technique, and FIG. The figure shows a second conventional technique. In the figure, 1 is a shield member, 1a is a joint, 1b is a folded portion, 2 is a coaxial multicore cable, 2a is an inner conductor, 2b is an insulator, 2c is an outer conductor, 2d is a jacket, and 3 is an adhesive. Shown respectively.

Claims (1)

[Scope of utility model registration request] 1. A flat wire having a plurality of wire cores covered by a shield member 1 having a metal surface on one surface and a non-metal surface on the other surface, and a bonding portion 1a fixed by an adhesive 3. In the cable, the shield structure for a flat cable is characterized in that the metal surfaces of the shielding member 1 are adhered to each other to cover the plurality of core wires, the joint portion 1a thereof is bent and fixed by the adhesive 3. .