JPH1125763A - Double-coating flat cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cable which is optimum for use as a small-diameter flat cable having a thin insulating material and is not only easy to manufacture but easy for thermal fusion. SOLUTION: This cable, first, is made such that a conductor is coated with insulating materials. In this case, a thin film-like insulating material 3a is applied around a conductor 2 so that an end part (an edge part) of a fusing piece can be prevented from biting into an insulating material 4a and that thermal fusion can be facilitated, and the insulating material 4a is applied thereon. Secondly, the thin film-like insulating material 3a in the first case is replaced by a thin film-like heat resistant insulating material 3b, and the insulating material 4a is replaced by an easily thermally fusible insulating material 4b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double-coated flat cable 1 which is most suitable for a thin flat cable having a thin insulator and is easy to manufacture and easily heat-sealed.

[0002]

FIG. 3 shows a conventional method of manufacturing a flat cable 6 'by a heat sealing roll 5'. As is clear from the figure, a plurality of electric wires each having a conductor coated with a thermoplastic resin are arranged in parallel in the longitudinal direction, and are sandwiched from above and below by a heat-sealing roll 5 'provided with a convex portion. This is a method for manufacturing a flat cable 6 'in which adjacent insulators are fused and integrated by the heat and pressure 5'.
As is clear from FIGS. 4 and 5, a flat type flat cable 7 'having a fusion portion A and a separation portion B in the longitudinal direction.
Is manufactured, a top 8 'for heat fusion is attached to the heat fusion roll 5'. Top groove 10 'for thermal fusion
Is thinner than the groove 9 'of the heat fusing roll, so that a step is formed. At the end of the fusing portion A, the end (edge) of the top bites into the insulator, and the thickness of the coating of the insulator is thin. And sparks are likely to occur. In addition, the thinner the wire, the thinner the coating thickness of the insulator, the more the heat and pressure of the heat fusing roll, the more the spark is likely to occur, and the lower the fusing roll, the lower the fusing strength. However, there is a disadvantage that the manufacturing range is limited.

[0003]

SUMMARY OF THE INVENTION The connector 1 for a double coated flat cable according to the present invention solves such a drawback, and is most suitable for a thin flat cable having a thin insulator and easy to manufacture. In addition, the purpose of the present invention is to provide a double-coated flat cable 1 that can be easily heat-sealed. (2) a thin-film insulator 3a is provided around the conductor 2 so as to prevent the portion 2) from biting into the insulator, and thermal fusion is facilitated, and the insulator 4a is coated thereon. This is a flat cable 1.
The second is a double-coated flat, characterized in that the first thin-film insulator 3a is made into a thin-film heat-resistant insulator 3b and the insulator 4a is made into an insulator 4b which is easily heat-fused. Cable 1.

[0004]

The structure in which the frame is double-coated with the insulator, that is, the thin-film insulator 3a or the thin-film heat-resistant insulator 3b prevents the edge (edge) of the top from digging into the insulator, thereby facilitating heat generation. It becomes possible to fuse.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a double-coated flat cable 1 according to the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 shows a first embodiment of the double-coated flat cable of the present invention.
It is sectional drawing of an Example. As is apparent from the figure, the first aspect of the present invention is that in a flat cable in which a conductor is covered with an insulator, the end (edge) of the top is prevented from biting into the insulator, and heat fusion is easily performed. A double-coated flat cable 1 characterized in that a thin-film insulator 3a is provided around a conductor 2 and an insulator 4a is coated thereon.
It is. FIG. 2 is a sectional view of a second embodiment of the double-coated flat cable of the present invention. As is apparent from the figure, the second aspect of the present invention is the first thin-film insulator 3a.
Is a thin-coated heat-resistant insulator 3b, and the insulator 4a is an insulator 4b that is easily heat-fused. Thin-film heat-resistant insulator 3b
As a typical example, polyester elastomer
Or a fluorine resin may be used. Here, the reason why the insulator is formed into a thin film is that when a contact terminal of a U-shaped connector breaks through the insulator of the flat cable and is pressed into the conductor 2 at the center, a too strong and thick insulator is used. Since non-conduction may occur, the formation of a thin film causes the insulator to break and come into contact, thereby enabling conduction. A normal PVC resin or the like was used as the insulator 4a. Further, the method of forming the insulator is not limited to ordinary extrusion, but may be coating or the like. With the above structure, the structure in which the end portion (edge portion) of the top is cut by the double-coated structure with the insulator, that is, the thin-film insulator 3a or the thin-film heat-resistant insulator 3b, can be easily formed. Heat fusion becomes possible. Next, as a result of comparing the double-coated flat cable 1 of the present invention with a contact resistance, a high-temperature creep, and a thermal shock, which are reliability tests, the performance is almost the same as that of a flat cable having a normal thickness. Results were obtained.

In the embodiments of the present invention, the method of forming the insulator has been described by taking typical extrusion, coating and the like as a typical example. However, the method is not limited to this, and a method of tape winding or the like may be used. As described above, it goes without saying that various modifications are included in the design within the scope of the present invention.

[0007]

As is apparent from the above description, the double-coated flat cable 1 of the present invention can be manufactured not only in the case where the outer diameter of the electric wire is small but also in the case of a small-diameter flat cable. Since the excellent effect that it can be produced can be achieved, its industrial value is great.

[Brief description of the drawings]

FIG. 1 is a sectional view of a first embodiment of a double-coated flat cable of the present invention.

FIG. 2 is a sectional view of a second embodiment of the double-coated flat cable of the present invention.

FIG. 3 shows a conventional heat-sealing roll 5 for a flat cable 6 '.
'Manufacturing method.

FIG. 4 is a perspective view of a conventional flat type flat cable 7 '.

FIG. 5 shows grooves of a heat-sealing roll 5 'and a top 8' of a conventional Sudare type flat cable 7 '.

DESCRIPTION OF THE SYMBOLS 1 Double-coated flat cable of the present invention 2 Conductor 3a Thin-film insulator 3b Thin-film heat-resistant insulator 4a Insulator 4b Insulator easily heat-sealed 5 'Conventional heat-sealing roll 6 'Conventional flat cable 7' Conventional flat type flat cable 8 'Conventional heat-sealing top 9' Groove of heat-sealing roll 10 'Groove of heat-sealing top

Claims (2)

[Claims] In a flat cable in which a conductor is covered with an insulator, a thin-film insulator is provided around the conductor,
A double-coated flat cable 1 characterized by being covered with an insulator 4a. 2. The double-coated flat cable according to claim 1, wherein the thin-film insulator 3a is a thin-film heat-resistant insulator 3b, and the insulator 4a is an insulator 4b that is easily heat-fused. One.