JP4491971B2 - Interface cable and manufacturing method thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an interface cable and a manufacturing method thereof, and more particularly to an interface cable in which electrical characteristics such as characteristic impedance are defined and a manufacturing method thereof.
[0002]
[Prior art]
Interface cables, which are communication cables between devices, are used between computers such as computers, personal computers, and workstations and associated devices (for example, between input / output devices-arithmetic devices-storage devices) or between the computer main unit and various terminal devices ( For example, it is used for signal transmission of a CRT, a printer, etc.
[0003]
In the interface cable, there are cases where electrical characteristics such as capacitance and characteristic impedance are problematic in terms of the performance of signals to be transmitted. In this case, for example, as shown in FIG. A multi-core wire is used in which a plurality of twisted wire cores 24 (four in FIG. 2) are twisted.
[0004]
When a plurality of pairs of twisted wire cores 24 are twisted together, a press-wound tape 25 such as a paper tape, a plastic tape, or a plastic tape with a metal foil bonded to the outer periphery of the twist is taped. Thereafter, the outer circumference of the press-wound tape 25 is covered with the braided shield 26 and the sheath 27 to obtain the interface cable 20. Further, an interposition 28 such as a cotton thread is disposed in the gap between the twisted outer periphery of the plurality of twisted cores 24 and the presser winding tape 25 so as to keep the cross section of the cable 20 circular.
[0005]
In recent years, with the increase in exports of equipment or systems, the interface cable 20 has been certified based on a standard value of electrical characteristics such as characteristic impedance, for example, the UL (Under writers Laboratories) standard in the United States. The ones obtained have become mainstream.
[0006]
[Problems to be solved by the invention]
By the way, when taping with the presser winding tape 25 without disposing the interposition 28 in the gap described above, the longitudinal direction of the twisted wire core 24 is perpendicular to the drawing in FIG. 2 between the tape 25 and the twisted wire core 24. Gaps (unevenness) in both the circumferential direction and the circumferential direction, and the air layer (or space) existing in the gap causes a decrease in characteristic impedance, etc., and causes variations in electrical characteristics and unevenness. Thus, it becomes difficult to stabilize the electrical characteristics.
[0007]
Even if the interposition 28 is disposed in the gap described above, if the work is performed in a high humidity environment, the moisture contained in the cotton yarn causes variations in electrical characteristics and causes unevenness. This makes it difficult to stabilize the electrical characteristics.
[0008]
An object of the present invention created in view of the above circumstances is to provide an interface cable having stable electrical characteristics.
[0009]
Another object of the present invention is to provide a method for easily and easily manufacturing an interface cable having stable electrical characteristics.
[0010]
[Means for Solving the Problems]
Interface cable according to the present invention for achieving the above-twisting a plurality of twisted pairs mind, the interface cable formed by taping at the stranding the holding tape outer circumference, a cushion layer an outer mating the twist A cushion layer is provided between the twisted outer periphery and the presser wound tape by taping with a presser wound tape, and the cushion layer is deformed according to the unevenness of the twisted outer periphery, whereby the unevenness of the twisted outer periphery is cushioned. And the outer periphery of the presser wound tape is covered with a sheath.
[0011]
According to the above configuration, by tapering the twisted outer periphery with the presser wound tape having the cushion layer, the unevenness of the twisted outer periphery is filled with the cushion layer, and there is a gap between the twisted outer periphery and the presser wound tape. Disappear.
[0012]
The presser wound tape is preferably made of a polyolefin-based tape.
[0013]
Moreover, the press-wound tape may have a metal layer on the surface that is twisted and does not contact the outer periphery.
[0014]
On the other hand, the interface cable manufacturing method according to the present invention twists the cushion layer of the press-wound tape when twisting a plurality of pairs of twisted wire cores and taping the twisted outer periphery with a press-wound tape having a cushion layer. It is deformed following the irregularities on the outer periphery of the mating, and the irregularities on the outer periphery of the twisting are filled with a cushion layer.
[0015]
According to the above method, when taping the twisted outer periphery with the presser wound tape having the cushion layer, the cushion layer of the presser wound tape is deformed following the unevenness of the twisted outer periphery. Is filled with a cushion layer, which eliminates the gap between the twisted outer periphery and the presser tape.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a preferred embodiment of the invention will be described with reference to the accompanying drawings.
[0017]
A cross-sectional view of the interface cable of the present invention is shown in FIG. Here, the same members as those in FIG.
[0018]
As shown in FIG. 1, the interface cable 10 of the present invention has a plurality of twisted wire cores 24 (four in FIG. 1) twisted by twisting a wire core 23 in which a conductor 21 is covered with an insulator 22. In addition, the outer periphery of the twisted tape is taped with a presser wound tape 11 having a cushion layer 12, and the outer periphery of the presser wound tape 11 is covered with a sheath 27. Here, a braided shield 26 may be appropriately provided between the presser winding tape 11 and the sheath 27.
[0019]
The press-wound tape 11 is not particularly limited as long as it is a tape having a cushion layer 12 that can be deformed following the irregularities 15 of the twisted outer periphery, but is preferably a polyolefin tape, such as foamed polyethylene, foamed polypropylene, and the like. Is mentioned.
[0020]
The layer thickness of the cushion layer 12 is appropriately selected according to the maximum outer diameter of the twisted outer periphery and the size of the unevenness 15 and is not particularly limited, but is preferably about 1 to 10 mm, for example.
[0021]
The presser winding tape 11 has an adhesive layer 13 on the surface of the cushion layer 12 that contacts the twisted outer periphery. Moreover, the tape 11 may have the metal layer 14 on the surface (the surface on the braided shield 26 side in FIG. 1) that is not twisted and does not contact the outer periphery. Here, the metal layer 14 is formed by a method of attaching a metal foil to the cushion layer 12 or depositing or applying metal powder on the cushion layer 12.
[0022]
Next, a method for manufacturing an interface cable according to the present invention will be described with reference to FIG.
[0023]
After twisting the wire core 23 in which the conductor 21 is covered with the insulator 22 to form a twisted wire core 24, a plurality of the twisted wire cores 24 are twisted and the twisted wire cores 24 are twisted together. Taping the presser winding tape 11 having the cushion layer 12 on the outer periphery. At this time, the taping method of the presser winding tape 11 may be either winding wound in a spiral shape in the longitudinal direction or vertical attachment.
[0024]
Here, by tapering the presser winding tape 11 around the twisted outer periphery, the cushion layer 12 of the presser wound tape 11 becomes unevenness 15 on the twisted outer periphery, that is, unevenness 15 in the circumferential direction and the longitudinal direction in the twisted core 24. Follow the deformation. As a result, the irregularities 15 on the outer periphery of the twist are almost completely filled with the cushion layer 12.
[0025]
Thereafter, the braided shield 26 and the sheath 27 are sequentially coated on the outer periphery of the presser winding tape 11 to obtain the interface cable 10.
[0026]
According to the interface cable 10 and the manufacturing method thereof according to the present invention, the presser winding tape 11 is taped around the twisted outer periphery of the twisted wire core 24 so that the unevenness 15 on the twisted outer periphery is almost completely filled with the cushion layer 12. In addition, since an air layer (or space) does not exist between the twisted outer periphery and the presser winding tape 11, the characteristic impedance of the cable 10 is not lowered, and stable electric characteristics can be obtained. it can.
[0027]
Further, as in the case of the conventional cable 20 shown in FIG. 2, even if the interposition 28 is not disposed between the twisted outer periphery of the twisted wire core 24 and the presser winding tape 25, the unevenness 15 on the twisted outer periphery can be formed as a cushion layer. 12 is almost completely filled, so that the cross section of the cable 10 can be held in a circular shape. As a result, the intervention required to hold the cable in a circular shape is no longer necessary, so that the cable 10 can be manufactured easily and easily, and the manufacturing cost of the cable 10 can be reduced compared to the conventional case. it can.
[0028]
As mentioned above, it cannot be overemphasized that embodiment of this invention is not limited to embodiment mentioned above, and various things are assumed in addition.
[0029]
【The invention's effect】
In short, according to the present invention, the following excellent effects are exhibited.
(1) By tapering the twisted outer periphery with a press-wound tape having a cushion layer, the unevenness of the twisted outer periphery is filled with the cushion layer, and there is no gap between the twisted outer periphery and the press-wound tape.
(2) Due to (1), since there is no gap, an interface cable with stable electrical characteristics can be obtained.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an interface cable according to the present invention.
FIG. 2 is a cross-sectional view of a conventional interface cable.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Interface cable 11 Presser winding tape 12 Cushion layer 14 Metal layer 15 Concavity and convexity 24 Paired strand core 27 Sheath

Claims (4)

In the interface cable formed by twisting a plurality of twisted wire cores and taping the twisted outer periphery with a presser wound tape, the twisted outer periphery is taped with a presser wound tape having a cushion layer, and the twisted outer periphery and the above A cushion layer is provided between the press-wound tape, and the cushion layer is twisted and deformed following the unevenness of the outer periphery to fill the unevenness of the twisted outer periphery with the cushion layer, and the outer periphery of the press-wound tape is covered with a sheath An interface cable characterized by   The interface cable according to claim 1, wherein the presser wound tape is made of a polyolefin-based tape.   The interface cable according to claim 1, wherein the press-wound tape has a metal layer on a surface that is twisted and does not contact the outer periphery. In the method of manufacturing an interface cable in which a plurality of twisted wire cores are twisted and the outer periphery of the twisted wire is taped with a presser wound tape, the twisted outer periphery is taped with a presser wound tape having a cushion layer and the twisted A cushion layer is provided between the outer periphery and the presser winding tape, and the cushion layer is twisted and deformed following the unevenness of the outer periphery, whereby the unevenness of the twisted outer periphery is filled with the cushion layer. Production method.

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