JP2501881Y2 - Multi-core cable - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a cable used as internal wiring of electronic equipment such as a computer, more specifically, a plurality of cores including two insulated core wires and a drain wire. The present invention relates to an improvement of a multi-core cable having a flat core at the terminal portion in order to facilitate the terminal processing while gathering.

[Prior Art] As a conventional twisted pair shield type multi-core cable, a pair of insulated wires are twisted and a shield and a jacket are provided on the cores, and a jacket is provided on the outermost circumference as necessary. A multi-core cable having a structure composed of is used.

By the way, the rationalization of the terminal treatment of the twisted pair shield type multi-core cable has progressed to the point where the jacket and the shield are integrated and stripped together by a strip machine.

[Problems to be Solved by the Invention] However, it is impossible to simultaneously strip two pairs of twisted wire insulators due to the structure in which the wire cores are twisted.

That is, when two wire cores are stripped at the same time, it is necessary to manually untwist and align the twisted pair, which is very time-consuming. Improvement was desired.

[Means for Solving the Problems] The object of the present invention is to solve the above-mentioned drawbacks of the conventional technology,
It is an object of the present invention to provide an improved multi-core cable that greatly improves the end workability of the conventional twisted pair shielded multi-core cable.

That is, the gist thereof is that two conductors are formed by coating two conductors with an insulator, respectively, and at least one side of the above-mentioned insulators on a substantially horizontal straight line with the two conductors of each of the conductors. A plurality of cores consisting of a vertically arranged drain wire, a press-winding shield tape layer wound around its outer circumference, and a thermoplastic resin jacket extruded in a substantially rectangular shape on its outer circumference are bundled together. The multi-core cable is characterized in that the cores are arranged in parallel at both ends thereof, and only the surfaces of the cores are heat-sealed together.

In the above, as the two conductors and the drain wire, an annealed copper wire, a tin-plated annealed copper wire, a silver-plated annealed copper wire, or the like is used.

In particular, when a fluorine resin is used as the insulator, silver plating is suitable in order to prevent the conductor from discoloring due to the high temperature during extrusion of the fluorine resin.

As the insulator, vinyl chloride, polyethylene, or a thermoplastic resin such as a fluorine resin is used.

Fluorine resin is particularly preferable because it has excellent electrical characteristics.

As the fluorine resin, extrusion-coatable tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA), tetrafluoroethylene-hexafluoropropylene copolymer (FEP) or ethylene-tetrafluoroethylene copolymer (TFE) Is appropriate.

As a method of applying the insulator, it is provided on the outer circumference of the conductor by a general extrusion method, but any of a foam type and a structure in which a solid layer is applied to the foam surface can be applied. In consideration of electrical characteristics, the foam type is preferable.

Here, in the case of a structure in which a solid layer is formed on the surface of the foam, the solid fluororesin insulator layer needs to be provided sufficiently thinner than the foamed fluororesin insulator layer.

That is, the solid fluororesin insulator layer is good for the purpose of smoothing the surface of the foamed fluororesin insulator layer and stabilizing the electrical characteristics, but thickening the solid fluororesin layer results in a higher dielectric constant. It is not preferable because it goes up.

This thickness is preferably 0.10 mm or less, particularly preferably 0.06 mm or less, though it depends on the manufacturing technique.

The foamed fluororesin layer is preferably a highly foamed one having a degree of foaming of 50% or more, preferably 60% or more. PFA, FEP, or
ETFE is provided by extrusion.

The drain wire may be provided on at least one side of the insulating core, and may be provided on both sides of the two insulating cores as necessary.

In this case, the drain wire is arranged substantially in line with the conductors of the two insulated cores, which allows mechanization of the terminal treatment.

As the presser-wrap shield tape, a copper tape, a copper-plated tape, or a laminated tape of a metal tape such as an aluminum tape and a plastic tape such as a polyester tape for reinforcement is used. To use.

When using aluminum tape as the metal tape, approximately 10
The one with a thickness of about μ is used.

The polyester tape is used to reinforce the aluminum tape, and 6 μ, preferably 4 μ or less is good.

That is, the thicker the polyester tape is, the higher the strength is, and the easier handling at the time of manufacturing, but if it is too thick, the shield tape cannot be peeled off at the same time as the jacket during the terminal treatment.

In order to surely remove the shield tape at the same time as the jacket during the terminal treatment, it is preferable to provide a vinyl resin coating layer on the surface of the reinforcing polyester tape.

The coating layer provided on the surface of the polyester tape is fused and integrated with the jacket by the heat at the time of covering the jacket, and the shield tape can be peeled off at the same time as the jacket.

Further, as a method of facilitating the peeling work, it is conceivable to weaken the strength of the reinforcing tape. Specifically, a polyester tape for reinforcing continuously independent holes within a range where taping work is possible. It can be considered to be installed in

As the jacket, a thermoplastic resin such as vinyl chloride or fluorine resin is provided by extrusion coating.

As a method of heat-sealing the cores arranged in parallel at both ends of the cable, it is preferable that only the upper and lower surfaces of the cores are heat-sealed and the contact portions between the adjacent cores are not welded.

That is, when the core is fused, only the upper and lower surfaces are heat-fused, and the jacket is heated above the melting point in order to heat-fuse, but at this time, the volume of the jacket changes significantly and the dimensional accuracy between the conductors is reduced. In order to prevent this, only the upper and lower surfaces are heat-sealed.

[Embodiment] Next, an embodiment of the multi-core cable of the present invention will be further described with reference to the accompanying drawings.

FIG. 3 shows the overall appearance of the cable. The cores are arranged in parallel at both ends to form a flat portion 9, and in the central portion, a plurality of cores are bundled by a binding cord 8 to form a tabber. The line portion 7 is configured.

FIG. 2 shows a cross section of both ends of the cable, in which cores are arranged in parallel, and only the surfaces of the cores are heat-bonded 6 to each other.

As shown in FIG. 1, the core is composed of two conductors 1, an insulator 2 provided on the outer periphery thereof, a drain wire 3 vertically provided on one side thereof, and a press-winding shield tape layer 4 wound on the outer periphery thereof. And a jacket 5 extruded on the outermost periphery.

Here, as the conductor 1, a silver-plated annealed copper wire having a wire diameter of 0.26 mm is used.

As the insulator 2, FEP, which is a fluororesin, is extrusion-coated on the outer periphery of the conductor 1 to have a thickness of about 0.2 mm and an outer diameter of about 0.65 mm.

As the drain wire 3, a silver-plated annealed copper wire having a wire diameter of 0.26 mm is used, which is vertically attached to the two conductors 1 so as to be positioned in a substantially horizontal straight line, and the outer periphery thereof is a laminate of aluminum and polyester. The tape 4 is wound with the aluminum surface inside.

Further, a vinyl chloride (PVC) jacket 5 is extrusion-coated on it with a width of about 2.54 mm, a thickness of about 1.25 mm and a substantially rectangular cross-section.

In order to further improve the strip property, the shield tape 4 is made of a polyester surface coated with a thin vinyl chloride resin so as to be integrated with the heat of the extrusion process of the vinyl chloride jacket.

Twenty-five cores thus formed were juxtaposed, and 60 mm at both ends of a required length of 3 m was heat-fused only on the surface of the jacket to form a surface-fused portion 6 to form a multi-core cable.

The non-fused part is a vinyl chloride string tied at about 500 mm intervals.

The characteristics of the multicore cable of the present embodiment thus constructed are as follows: Characteristic impedance Z ₀ = 85 (Ω) ±
Satisfying 10% and delay time T _d = 4.8 ± 0.2 (nsec / m), it became clear that there was no problem in actual use.

For terminal workability, first insert the jacket and shield tape at once into the strip machine blade from above the jacket of the terminal fusion section, and strip 25 pieces together.

Next, a strip machine is used in the same way for the insulator, and a total of 50 strips are stripped together.

This can be done because the two conductors and the drain wire are located on a substantially horizontal straight line.

Next, when allocating the two conductors and the drain wire, the pitch between the conductors is about 0.65 mm, and the position of the drain wire is accurately completed.

Finally, since the pitch accuracy between conductors is high for connection to the connector, it is possible to use methods such as soldering or spot welding with an automatic machine, and a great deal of rationalization of terminal processing could be realized.

[Effects of the Invention] As described above, according to the present invention, it is possible to provide a multi-core cable for internal wiring of electronic equipment, which is excellent in terminal processing workability, and its practical value is extremely large. There is.

[Brief description of drawings]

FIG. 1 is a cross-sectional explanatory view showing an embodiment of a cable core used in the multi-core cable of the present invention, FIG. 2 is a cross-sectional explanatory view of its terminal portion, and FIG. 3 is one of the multi-core cable of the present invention. It is a whole explanatory view showing an example. 1: Conductor, 2: FEP insulator, 3: Drain wire, 4: Shield tape, 5: PVC jacket, 6: Surface fusion part, 7: Tab wire part,
8: Tie cord, 9: Flat part.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takezo Taniji 5-1-1, Hidaka-cho, Hitachi, Hitachi, Ibaraki Hidaka Plant (56) Reference JP-A-1-267908 ( JP, A) Actually open 61-3617 (JP, U) Actually open 61-204311 (JP, U)

Claims (1)

(57) [Scope of utility model registration request] 1. Insulating wire cores in which two conductors are coated with an insulator, respectively, and two conductors of the insulating wire cores are vertically attached to at least one side of the insulator on a substantially horizontal straight line. A plurality of cores composed of a drain wire, a press-winding shield tape layer wound around the outer periphery thereof, and a thermoplastic resin jacket extruded and coated in a substantially rectangular shape around the outer periphery are bundled together, and both ends thereof are bundled. In the multi-core cable, the cores are arranged in parallel, and only the surfaces of the cores are heat-sealed to each other.