JPS6250925B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power flat cable used for underlaying a carpet.

Among the electrical performances required for power flat cables, insulation performance is extremely important from the point of view of protecting people from electric shock, as they have a large load capacity, unlike flat cables used for electronic equipment. . Furthermore, the ability to smoothly dissipate heat generated by energization is also required.

By the way, FIG. 1 shows a conventionally used flat power cable. The flat cable main body 3 includes a plurality of strip-shaped conductors 1 (for example, three
2) They are buried in parallel in the insulating material 2 at intervals,
It is formed into a flat shape. The insulating material 2 consists of two upper and lower insulating layers 2A and 2B with respect to the conductor 1,
As the material of the outer insulating layer 2A and the inner insulating layer 2B, a material with excellent insulating performance such as polyester, vinyl chloride, polyethylene, etc. is used, and
Materials with high volume resistivity are used. 4' is an adhesive layer formed between the insulating material 2 and the conductor 1 over the entire upper and lower surfaces of each conductor 1, and the end surface of this adhesive layer 4' is as shown in FIG. It is exposed on the end face side of the flat cable main body 3. If the flat cable main body 3 is submerged in water, since the adhesive layer 4' has a low volume resistivity, the water will enter from the exposed end face of the adhesive layer 4' and the insulation performance will be significantly reduced. Further, although theoretically it would be sufficient if the adhesive layer 4' is made of an adhesive having excellent volume resistivity, it is difficult to realize this in reality.

Figure 2 shows another conventional example, in which the flat cable body 3 that does not use an adhesive layer has excellent insulation performance, but because the surface of the conductor 1 is smooth, it is insulated from the conductor 1. There is a drawback that the adhesion with the material 2 is insufficient, and as shown in FIG. 2, a gap 5 is created between the conductor 1 and the insulating material 2. This gap 5 is particularly likely to occur when the flat cable main body 3 is bent, and becomes a factor that inhibits heat radiation.

The present invention has been provided in view of the above-mentioned points, and provides a flat cable whose purpose is to improve the electrical performance of the flat cable itself, particularly the insulation performance in damp or submerged environments. It is.

Embodiments of the present invention will be described in detail below with reference to the drawings. The overall structure is formed substantially similar to that shown in FIG. The insulating material 2 formed in the form of a film and consisting of two layers attached to the upper and lower surfaces of the conductor 1 is made of polyester, vinyl chloride, polyethylene, Teflon (trade name), etc., depending on the purpose and use. select. The adhesive layer 4 is formed only on the peripheral surface of the conductor 1 for each conductor 1, and the adhesive layer 4 is provided individually for each conductor 1, and the end surface of the adhesive layer 4 is not exposed to the outside. Further, as the adhesive for the adhesive layer 4, a polyester adhesive, a vinyl chloride adhesive, an epoxy adhesive, etc. are used, but the adhesive is not limited thereto. The conductor 1 is made of, for example, a copper conductor.

However, by not providing an adhesive layer over the entire surface as shown in FIG. 1, but by separately providing an adhesive layer 4 only around the conductor 1 as shown in FIG. 3, the flat cable main body 3 can be prevented from being flooded with water. However, since the adhesive layer 4 does not come into direct contact with water, the insulation performance is significantly improved.
In addition, since there is an adhesive layer 4 around the conductor 1, the second
It is also possible to prevent voids as shown in the figure.

The flat cable main body 3 is manufactured by applying the adhesive layer 4 to the inner surface of the insulating layer 2B inside the insulating material 2 and then bonding it by thermocompression. Only a thermopressure layer may be provided between the insulating layers 2B and 2B in the portion where the adhesive layer 4 is not provided. Alternatively, after applying an adhesive to form the adhesive layer 4 to the circumferential surface of the conductor 1, the insulating material 2 may be thermocompression bonded from the upper and lower surfaces. Therefore, the distance between the end of the adhesive layer 4 and the side end of the insulating material 2 can be secured.

As described above, the present invention forms a flat cable body in which a strip-shaped conductor is embedded in an insulating material, and an adhesive layer is formed between the conductor and the insulating material only on the circumferential surface of the conductor. Since the adhesive layer is not exposed on the side end surface of the flat cable body as in conventional cables, even if the flat cable body is submerged in water, the adhesive layer will not be penetrated by water, so the insulation performance will deteriorate. It has the effect of protecting the human body from electric shock and increasing stability, and since it uses an adhesive layer, it has the effect of preventing the formation of harmful gaps between the conductor and the insulating material due to the heat dissipation caused by electricity. play.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a conventional example, FIG. 2 is a perspective view of another conventional example, and FIG. 3 is a perspective view of an embodiment of the present invention. 1 is a conductor, 2 is an insulating material, 3 is a flat cable body, and 4 is an adhesive layer.

Claims (1)

[Claims] 1. A flat cable consisting of a flat cable body in which a band-shaped conductor is embedded in an insulating material, and an adhesive layer is formed only on the circumferential surface of the conductor between the conductor and the insulating material.