JPH0794042A - Extra-fine twisted pair wire and manufacturing method thereof - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an ultrafine twisted pair wire in which twist length and twist pitch are secured without easily loosening, and a method for producing the same. [Structure] Extra fine wires 2 and 2 having a thermoplastic adhesive layer 5 formed on the outer surface are twisted together, and then heated to melt the adhesive layer 5 and then cooled and re-cured to obtain an extra fine wire. Adhesively fix the lines 2 and 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an extra fine twisted pair wire used for a lead wire for a magnetic head and a method for manufacturing the same.

[0002]

2. Description of the Related Art In a magnetic disk device which is one of data storage devices in computers and the like, two ultrafine wires having a wire diameter of about 46 μm are used as element wires as lead wires connected to the magnetic head. It was usual to use ultra-fine parallel conductors that are bonded in parallel, but in recent years, two ultra-fine conductors have been used for the purpose of improving durability and flexibility, and taking measures against crosstalk and noise. Ultra-fine twisted pair wires in which wires are twisted together have been used.

[0003]

By the way, in the case of twisting a wire having a large wire diameter, the twisted shape is naturally maintained by the plastic deformation of the wire, and the original twist length and twist pitch remain unchanged. However, in the case of twisting extra fine wires like the above magnetic head lead wires, the extra fine wires are difficult to be plastically deformed so that they cannot be wound and they are easily unraveled by their own elasticity and twisted. The length and twist pitch may change. In addition, if the wire is twisted strongly so as to cause a curl, a problem occurs that the ultrafine wire is broken or stretched.

The present invention has been made in view of the above circumstances, and an extra fine twisted pair wire which does not easily unravel,
It is an object to provide a manufacturing method thereof.

[0005]

In order to achieve the above-mentioned object, the extra fine twisted pair wire according to claim 1 is a super fine twisted pair wire formed by twisting a plurality of extra fine wires. An adhesive layer is formed on each of the outer surfaces, and the ultrafine wires are adhesively fixed to each other by adhering the adhesive layers to each other.

Further, in the method for producing an extra fine twisted wire according to a second aspect, a plurality of extra fine wires having an adhesive layer having thermoplasticity formed on the outer surface are twisted together and then the extra fine wires are heated. Then, the adhesive layer is melted, and then the ultrafine wires are cooled to re-harden the adhesive layer, whereby the ultrafine wires are bonded and fixed to each other.

[0007]

In the extra fine twisted pair wire according to the first aspect, the extra fine wires are adhered and fixed to each other by the adhesive layer formed on the outer surface of each extra fine wire, so that the extra fine wires are not loosened.

In the method for producing an extra fine twisted wire according to a second aspect, an adhesive layer having thermoplasticity is formed in advance on the surface of each extra fine wire to be twisted, and the extra fine wires are twisted with each other and then heated. To melt the adhesive layer,
Then, the ultrafine wires are adhesively fixed to each other by cooling and curing the adhesive layer again.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows a cross section of an extra fine twisted pair wire 1 of this embodiment. This ultrafine twisted pair wire 1 is formed by twisting two ultrafine wires 2 and 2 as strands, and adhering and fixing them to each other to integrate them.

The fine wires 2 and 2 used as the wires are conductors 3.
Is covered with an insulating layer 4, and the surface thereof is further covered with an adhesive layer 5
The adhesive layers 5 are bonded to each other so that the ultrafine wires 2 and 2 are integrated in a twisted state.

As the conductor 3, for example, a copper wire having a wire diameter of about 46 μm whose surface is plated with gold is used, the insulating layer 4 is formed by extrusion coating of urethane resin, and the adhesive layer 5 is made of thermoplastic such as butyral varnish. The resin may be formed by a dipping method. The thickness of the adhesive layer 5 is, for example, 1 to 2 μm.
It is good to set the degree.

FIG. 2 shows a twisting machine 10 for manufacturing the above-mentioned extra fine twisted pair wire 1. This stranded wire machine 10 twists a rotary type wire supplying unit 11 that supplies the ultrafine wires 2 and 2 while applying a predetermined tension, and the ultrafine wires 2 and 2 supplied from the wire supplying unit 11. The distribution line plate 12 is provided with a guide hole (not shown) for guiding to the mating side, and a collecting die 13 for collecting the ultrafine wires 2 and 2 together.

The wire supply unit 11 has a bobbin 14, 14 provided with a twist-back mechanism, on the side surface of which a wire supply board 15 is provided.
And a drive unit 17 for rotating the wire supply board 15 around a rotation shaft 16.

A rotating shaft 16 for rotating the wire supply board 15 is extended and fixed to the distribution board 12, and the wire supply board 15 and the distribution board 12 are integrally rotated by the drive of a drive unit 17. It is supposed to do.

Further, a heating device 18 for heating the extra fine twisted pair wire 1 is provided between the twisting machine 10 and a take-up machine (not shown) for taking up the extra fine twisted pair wire 1 formed from the extra fine wires 2 and 2. It is arranged. The heating device 18 is, for example, 200 ° C.
It is advisable to adopt a horseshoe-shaped hot air blower that blows a certain amount of air.

In the above apparatus, the extra fine wires 2 and 2 on which the adhesive layer 5 made of a thermoplastic resin is previously formed are
The wires are drawn from the bobbins 14, 14 on the wire supply board 15, respectively guided by the distribution board 12 and gathered together in a collecting die 13, and they are integrally rotated by the wire supply board 15 and the distribution board 12. Are twisted together, and they are successively taken in the direction of arrow A and passed through the heating device 18.

As a result, the adhesive layer 5 coating the surfaces of the ultrafine wires 2 and 2 is melted, but after passing through the heating device 18, the adhesive layer 5 is naturally cooled in the atmosphere to lower its temperature and melted. The agent layer 5 is hardened again. Therefore, the extra fine wire 2,
The adhesive layers 5 are adhered and fixed to each other by adhering the adhesive layers 5 to each other, and the ultrafine twisted pair wire 1 shown in FIG. 1 is obtained.

In the above-mentioned extra fine twisted pair wire 1, since the adhesive layers 5 and 5 are adhered to each other and both extra fine wires 2 and 2 are integrated, there is no room for loosening like the conventional one. In addition, the twist length and twist pitch do not change, and the durability and flexibility are excellent.

Further, according to the above-mentioned manufacturing method, the ultrafine wires 2 and 2 on which the adhesive layer 5 is formed in advance are used as the wires, and after twisted by the twisting machine 10, the heating device 18 is used. Since the adhesive layer 5 is once melted and cured again by passing it, the ultrafine wires 2 and 2 can be securely and easily adhered and fixed. Of course, since the step of strongly twisting to cause the plastic deformation of the ultrafine wire 2 is not included, there is no problem that the ultrafine wire 2 breaks or stretches, and is conventionally adopted as a twisting machine. The thing can be used as it is.

In the above embodiment, the case where two extra fine wires 2 and 2 are twisted in a pair to produce the extra fine twisted pair wire 1 has been described. However, the present invention has three or more extra fine wires. The same can be applied to an ultrafine twisted pair wire formed from

In the above embodiment, the thermoplastic resin which has been heated and melted is naturally cooled in the atmosphere to be cured, but it may be forcibly cooled by an appropriate cooling device.

Further, the thermoplastic resin is not limited to the butyral varnish exemplified above, and it is needless to say that any appropriate resin can be adopted, and the thickness, forming method, heating temperature and heating can be selected according to the characteristics. The time, cooling time and cooling temperature may be set optimally.

[0023]

As described above, according to the extra fine twisted pair wire of the first aspect, since the outer surfaces of the extra fine wires are adhered and fixed to each other by the adhesive layer, they do not easily come loose. The twist length and twist pitch are secured, and the durability and flexibility are excellent.

Further, according to the method for manufacturing an extra fine twisted pair wire, the extra fine wires having the thermoplastic adhesive layer formed on the surface thereof are used as the element wires, and the wires are twisted and then heated. Since the adhesive layer is melted and cured again, each ultrafine wire can be reliably and easily adhered to each other, and the ultrafine wire does not include the step of twisting strongly to cause plastic deformation of the ultrafine wire, so the ultrafine wire is broken. It is suitable for use in manufacturing the above-mentioned extra-fine twisted pair wire without causing any stretching or stretching.

[Brief description of drawings]

FIG. 1 is a perspective view showing an ultrafine twisted pair wire according to an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a twisting machine for manufacturing the same ultra-fine twisted pair wire.

[Explanation of symbols]

1 ... Extra fine twisted pair wire, 2 ... Extra fine wire, 3 ... Conductor, 4 ... Insulating layer,
5 ... Adhesive layer, 10 ... Stranding machine, 18 ... Heating device

Claims (2)

[Claims] 1. An extra-fine twisted pair wire (1) obtained by twisting a plurality of extra-fine wires (2), wherein an adhesive layer (5) is formed on the outer surface of each extra-fine wire (2). An extra fine twisted pair wire, wherein the extra fine wires (2) are adhesively fixed to each other by adhering the adhesive layer (5) to each other. 2. A plurality of ultrafine wires (2) having an adhesive layer (5) having thermoplasticity formed on the outer surface are twisted together, and the ultrafine wires (2) are heated to produce the adhesive. Characterized in that the layers (5) are melted, and then the ultrafine wires (2) are cooled to re-harden the adhesive layer (5) so that the ultrafine wires (2) are adhesively fixed to each other. A method for manufacturing an extra fine twisted pair wire.