JP2016110960A - Shielded cable and multi-pair cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shielded cable having a structure by which disappearance of a symbol for identification can be prevented, and a multi-pair cable having a plurality of the shielded cables.SOLUTION: In one embodiment of the present invention, there is provided a shielded cable 10 having: a pair of signal lines 11; an insulator 12 coating the pair of signal lines 11; a shielded tape 13 as a print layer on the surface of which a symbol 16 for identification is printed and which coats the insulator 12; and a spirally wound transparent outer layer tape 15 coating the shielded tape 13.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a shielded cable and a multi-pair cable.

  2. Description of the Related Art Conventionally, a cable in which two insulated wires whose conductors are covered with an insulator are arranged in parallel or more together and the outer periphery thereof is covered with a shield or a sheath is known (for example, see Patent Documents 1 and 2). Such a cable is usually printed on the surface of the outermost layer with characters, marks, and the like for identification between the cables.

JP 2000-040423 A

  However, in cables such as those disclosed in Patent Documents 1 and 2, the identification symbol is printed on the surface of the outermost layer, so there is a risk of disappearing due to external impacts or cleaning with chemicals. .

  Accordingly, an object of the present invention is to provide a shielded cable having a structure capable of preventing disappearance of an identification symbol and a multi-pair cable having a plurality of shielded cables.

  In one embodiment of the present invention, in order to achieve the above-described object, a pair of signal lines, an insulator covering the pair of signal lines, and a printing layer that covers the insulator and has an identification symbol printed on the surface And a transparent outer layer tape that is wound around the print layer in a spiral manner and covers the print layer.

  According to the present invention, it is possible to provide a shielded cable having a structure capable of preventing the disappearance of the identification symbol and a multi-pair cable having a plurality of the shielded cables.

FIG. 1 is a schematic cross-sectional view of a shielded cable according to a first embodiment of the present invention. 2A to 2D are perspective views illustrating an example of a manufacturing process of the shielded cable according to the first embodiment. FIG. 3 is a schematic cross-sectional view of a shielded cable according to the second embodiment of the present invention. 4A to 4D are perspective views illustrating an example of a manufacturing process of the shielded cable according to the second embodiment. FIG. 5 is a schematic cross-sectional view of an example of a multi-pair cable according to the third embodiment of the present invention. FIG. 6 is a schematic cross-sectional view of another example of the multi-pair cable according to the third embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, in each figure, about the component which has the substantially same function, the same code | symbol is attached | subjected and the duplicate description is abbreviate | omitted.

[First Embodiment]
(Configuration of shielded cable)
FIG. 1 is a schematic cross-sectional view of a shielded cable 10 according to a first embodiment of the present invention.

  The shielded cable 10 includes a pair of signal lines 11, an insulator 12 that covers the pair of signal lines 11, and a shield tape 13 that covers the insulator 12 and has a surface on which an identification symbol 16 is printed. And a transparent outer layer tape 15 wound around the shield tape 13 in a spiral manner and covering the shield tape 13.

  The pair of signal lines 11 are conductor lines made of copper or the like, and can transmit a differential signal. As shown in FIG. 1, the pair of signal lines 11 may be collectively covered with a single insulator 12, but each signal line 11 may be covered with an independent insulator 12.

  The insulator 12 is made of an insulating material such as polyethylene, polytetrafluoroethylene (PTFE), tetrafluoroethylene / hexafluoropropylene copolymer (FEP), or the like. Further, as the insulator 12, a foamed insulating material such as foamed polyethylene can be used.

  The insulator 12 is a single insulator that collectively covers the pair of signal lines 11 and has a shape that does not have a depression in a region located immediately below the identification symbol 16 on the surface of the shield tape 13, for example, in the radial direction. It is preferable that the cross-sectional shape has an elliptical shape or a rectangular shape. In this case, even if an external force is applied to the shield tape 13, unevenness does not easily occur, so that printing can be performed accurately. When the radial cross-sectional shape is an ellipse, it is preferable to print the identification symbol 16 in the area of the shield tape 13 on the area having a small curvature in order to facilitate printing.

  As in the example shown in FIG. 1, when the cross-sectional shape in the radial direction of the insulator 12 is an ellipse, the region intersecting with the minor axis S substantially parallel to the direction of the major axis L of the ellipse is an ellipse. Since the shape has a small curvature, it is preferable to print the identification symbol 16 on the region intersecting the short axis S. When the cross-sectional shape in the radial direction of the insulator 12 is an ellipse, the two signal lines 11 are arranged along the direction of the long axis L of the ellipse as shown in FIG.

  The shield tape 13 is made of a belt-like member having a conductive metal layer, and is wound around the insulator 12 by vertical side winding (cigarette winding). Vertical accessory winding is a winding method in which the tape is wound in the width direction in the state in which the length direction of the tape is aligned with the length direction of the winding target, and wound around the winding target. The shield tape 13 has a structure in which, for example, a flexible insulating resin layer such as polyester and a conductive metal layer made of copper, aluminum, or the like are laminated. In this case, when connecting the shielded cable 10 to a substrate such as a connector, the shield tape 13 is placed on the insulator 12 so that the resin layer is on the inside and the metal layer is on the outside so that the metal layer is easily connected to the ground of the substrate. Wrap around When the shield cable 10 includes a drain wire inside the shield tape 13, the shield tape 13 is wound so that the metal layer faces inward.

  As shown in FIG. 1, the shield tape 13 wound in the vertical direction may have an overlapping portion 14 in which both ends in the width direction overlap each other. In the case of vertical side winding, the overlapping portion 14 is formed to extend in the length direction of the shielded cable 10.

  When a plurality of shielded cables 10 are bundled and used in a multi-pair cable or the like, normally, in order to minimize the influence of leakage of electromagnetic energy from the overlapping portion 14, each shielded cable 10 is arranged so that the overlapping portion 14 faces outward. Is placed. On the other hand, the identification symbol 16 is also preferably located outside each of the bundled shielded cables 10 in order to improve visibility. For this reason, the identification symbol 16 is preferably on the overlapping portion 14 of the shield tape 13.

  When the identification symbol 16 is printed on the overlapping portion 14 of the shield tape 13, the width of the overlapping portion 14 is larger than the width of the identification symbol 16 so that the identification symbol 16 does not ride on the step on the edge of the overlapping portion 14. Is also preferably large.

  In the case where the cross-sectional shape in the radial direction of the insulator 12 is an ellipse, in order to print the identification symbol 16 on the overlapping portion 14, a region having a small curvature of the ellipse, that is, an ellipse short axis S is used. It is preferable to provide the overlapping part 14 on the area | region which crosses.

  The identification symbol 16 is a symbol such as a character or mark used for identifying each cable when a plurality of shield tapes 13 are used, and is formed by application of ink.

  The shield tape 13 may be wound around the insulator 12 by spiral winding. In this case, for example, a metal foil such as a copper foil or an aluminum foil is used as the shield tape 13.

  The outer layer tape 15 is made of a transparent transparent belt-like member, and has a structure in which, for example, an insulating resin layer having flexibility such as PET and an adhesive layer containing an adhesive are laminated. In this case, the outer layer tape 15 is wound around the shield tape 13 so that the adhesive layer is on the inner side and the resin layer is on the outer side.

  The outer layer tape 15 is spirally wound along the length direction of the shielded cable 10 so that the end portions in the width direction overlap each other. By winding the outer layer tape 15, it is possible to prevent the shield tape 13 from peeling off from the insulator 12.

  Further, since the outer layer tape 15 is transparent, the identification symbol 16 printed on the shield cable 10 can be visually recognized from above the outer layer tape 15. It should be noted that the outer layer tape 15 only needs to be transparent enough to visually recognize the identification symbol 16 printed on the shielded cable 10 and may not be completely transparent.

(Shield cable manufacturing method)
2A to 2D are perspective views illustrating an example of a manufacturing process of the shielded cable 10 according to the first embodiment.

  First, as shown in FIG. 2A, an insulator 12 that covers the pair of signal lines 11 is formed by extrusion molding or the like.

  Next, as shown in FIG. 2B, the shield tape 13 is wound around the insulator 12.

  Next, as shown in FIG. 2C, an identification symbol 16 is printed on the surface of the shield tape 13. Printing is performed by a cable printer, but the printing format is not limited. In FIG. 2C, the number printed on the surface of the shield tape 13 as the identification symbol 16 represents an example of the identification symbol 16.

  Next, as shown in FIG. 2D, the outer layer tape 15 is wound around the shield tape 13 by spiral winding.

(Effects of the first embodiment)
According to the shielded cable 10 according to the first embodiment, since the identification symbol 16 is protected by the transparent outer layer tape 15, the visibility of the identification symbol 16 is ensured, while external impact or Disappearance of the identification symbol 16 due to cleaning with chemicals can be prevented.

[Second Embodiment]
The shielded cable according to the second embodiment is different from the shielded cable according to the first embodiment in the portion where the identification symbol is printed.

(Configuration of shielded cable)
FIG. 3 is a schematic cross-sectional view of a shielded cable 20 according to the second embodiment of the present invention.

  The shield cable 20 is wound in a spiral manner around the pair of signal lines 11, the insulator 12 covering the pair of signal lines 11, the shield tape 13 covering the insulator 12, and the shield tape 13. An inner layer tape 21 serving as a printing layer having an identification symbol 16 printed on the surface thereof, and a transparent outer layer tape 15 wound around the inner layer tape 21 in a spiral manner and covering the inner layer tape 21. Have.

  The inner layer tape 21 is made of a flexible belt-like member, and has a structure in which, for example, a flexible insulating resin layer such as polyester and an adhesive layer containing an adhesive are laminated.

  Similar to the shielded cable 10 according to the first embodiment, when a plurality of shielded cables 20 are bundled and used in a multi-pair cable or the like, usually, the overlapping portion 14 of the shield tape 13 wound vertically is directed outward. Each shielded cable 20 is arranged in the above. On the other hand, the identification symbol 16 is also preferably on the outside of each of the bundled shielded cables 20 in order to improve visibility. For this reason, the identification symbol 16 is preferably on the overlapping portion 14 of the shield tape 13.

  For this reason, in the shielded cable 20, when the shield tape 13 is vertically attached, it is preferable to print the identification symbol 16 in a region immediately above the overlapping portion 14 of the inner layer tape 21.

  The shield tape 13 may be wound around the insulator 12 by spiral winding.

  Since the outer layer tape 15 covering the inner layer tape 21 is transparent, the identification symbol 16 printed on the inner layer tape 21 can be visually recognized from above the outer layer tape 15.

(Shield cable manufacturing method)
4A to 4D are perspective views illustrating an example of a manufacturing process of the shielded cable 20 according to the second embodiment.

  First, as shown in FIG. 4A, the insulator 12 that covers the pair of signal lines 11 is formed by extrusion molding or the like.

  Next, as shown in FIG. 4B, the shield tape 13 is wound around the insulator 12.

  Next, as shown in FIG. 4C, the inner layer tape 21 is wound around the shield tape 13 by spiral winding.

  Next, as shown in FIG. 4D, the identification symbol 16 is printed on the surface of the inner layer tape 21.

  Next, as shown in FIG. 4E, the outer layer tape 15 is wound around the inner layer tape 21 by spiral winding. In the example shown in FIG. 4E, the outer layer tape 15 is wound in the same spiral direction as the inner layer tape 21, but the outer layer tape 15 and the inner layer tape are crossed so that the outer layer tape 15 and the inner layer tape 21 intersect. The winding direction of 21 may be reversed.

(Effect of the second embodiment)
According to the shielded cable 20 according to the second embodiment, the identification symbol 16 is protected by the transparent outer layer tape 15 as in the shielded cable 10 according to the first embodiment. While ensuring the visibility of the symbol 16, it is possible to prevent the identification symbol 16 from being lost due to external impacts or cleaning with chemicals.

  Further, in the shielded cable 20, the identification symbol 16 is printed on the spirally wound inner layer tape 21, so that the identification symbol 16 is printed on the shield tape 13 wound vertically. Thus, the problem that the layer on which the identification symbol 16 is printed before the outer layer tape 15 is wound is less likely to occur.

[Third Embodiment]
The third embodiment is a form of a multi-pair cable having a plurality of shielded cables according to the first embodiment or the second embodiment.

(Configuration of multi-pair cable)
FIG. 5 is a schematic cross-sectional view of a multi-pair cable 50 that is an example of the multi-pair cable according to the third embodiment of the present invention.

  The multi-pair cable 50 includes a plurality of shielded cables 10 according to the first embodiment, a shield tape 52 wound around the plurality of bundled shielded cables 10 and a shield tape 52. A braided wire 53 and a jacket 54 covering the braided wire 53.

  The number of shielded cables 10 is eight in the example shown in FIG. 5, but is not particularly limited, and is preferably two, eight, or 24, for example.

  In the example shown in FIG. 5, two shielded cables 10 are arranged at the center of the cross section of the many-pair cable 50, and six shielded cables 10 are arranged at substantially equal intervals around the intervening 51.

  When the multi-pair cable 50 includes the two shielded cables 10, for example, the shield tape 52 is wound directly around the two shielded cables 10 in the center of FIG. 5. Further, when the multi-pair cable 50 has 24 shielded cables 10, for example, the 16 shielded cables 10 are almost equal to each other around the eight shielded cables 10 shown in FIG. Arranged at intervals.

  Each of the plurality of shielded cables 10 is arranged so that the identification symbol 16 faces outward (opposite the center). For this reason, when the terminal treatment is performed on each shielded cable 10 exposed from the shield tape 52, the braided wire 53, and the jacket 54, the identification symbol 16 is easily visually recognized, and each shielded cable 10 is easily identified. Can do.

  When the radial cross-sectional shape of the insulator 12 of the shielded cable 10 is an ellipse, as shown in FIG. 5, the center of the insulator 12 ellipse and the center of the many-pair cable 50 are included in each shielded cable 10. The angle formed by the straight line connecting the two and the minor axis of the ellipse is nearly parallel. In this case, if the identification symbol 16 is printed on an elliptical region having a small curvature, that is, an area intersecting the elliptical minor axis, the identification symbol 16 of each shielded cable 10 faces outward.

  In addition, when the shield tape 13 is wound around the insulator 12 with the vertical wrapping, as shown in FIG. 5, the identification symbol 16 is on the overlap portion 14, and the plurality of shield cables 10 are overlapped. It is preferred that the portion 14 faces outward. In this case, the influence of leakage of electromagnetic energy from the overlapping portion 14 in the multi-pair cable 50 can be minimized.

  As materials for the shield tape 52, the braided wire 53, and the jacket 54, materials used in general cables can be used. The interposition 51 is made of, for example, paper, thread, or foam. The foam is, for example, foamed polyolefin such as foamed polypropylene or foamed ethylene.

  FIG. 6 is a schematic cross-sectional view of a multi-pair cable 60 which is another example of the multi-pair cable according to the third embodiment of the present invention.

  In the multi-pair cable 60, an interposition 61 is disposed at the center of the cross section, and eight shielded cables 10 are disposed at substantially equal intervals around the interposition 61. Other configurations are the same as those of the multi-pair cable 50 described above.

  Similar to the multi-pair cable 50, the plurality of shielded cables 10 are all arranged such that the identification symbol 16 faces outward (opposite the center). For this reason, when the terminal treatment is performed on each shielded cable 10 exposed from the shield tape 52, the braided wire 53, and the jacket 54, the identification symbol 16 is easily visually recognized, and each shielded cable 10 is easily identified. Can do.

  When the radial cross-sectional shape of the insulator 12 of the shielded cable 10 is an ellipse, as shown in FIG. 6, the center of the insulator 12 ellipse and the center of the many-pair cable 60 in each shielded cable 10. The angle formed by the straight line connecting the two and the minor axis of the ellipse is nearly parallel. In this case, if the identification symbol 16 is printed on an elliptical region having a small curvature, that is, an area intersecting the elliptical minor axis, the identification symbol 16 of each shielded cable 10 faces outward.

  In addition, when the shield tape 13 is wound around the insulator 12 by the vertical wrapping, as shown in FIG. 6, the identification symbol 16 is on the overlapping portion 14, and the plurality of shield cables 10 are overlapped. It is preferred that the portion 14 faces outward. In this case, the influence of leakage of electromagnetic energy from the overlapping portion 14 in the multi-pair cable 60 can be minimized.

  Note that the shielded cable 20 according to the second embodiment can be used in place of the shielded cable 10 for both the multiple-pair cable 50 and the multiple-pair cable 60. Even in this case, the plurality of shielded cables 20 are all arranged such that the identification symbol 16 faces outward (opposite the center). In addition, when the shield tape 13 is wound around the insulator 12 with the vertical accessory winding, the identification symbol 16 is on the overlapping portion 14 and the overlapping portions 14 of the plurality of shielded cables 20 face outward. It is preferable.

(Effect of the third embodiment)
According to the multi-pair cables 50 and 60 according to the third embodiment, since the identification symbol 16 of the shielded cable 10 or the shielded cable 20 is protected by the transparent outer layer tape 15, the identification symbol 16 is visually recognized. The disappearance of the identification symbol 16 can be prevented while securing the property.

  When a plurality of shielded cables 10 or shielded cables 20 are bundled so that each identification symbol 16 faces outward, the identification symbol 16 can be easily visually recognized, and each shielded cable 10 or shielded cable is identified. 20 can be easily identified.

(Summary of embodiment)
Next, the technical idea grasped from the above-described embodiment will be described with reference to the reference numerals in the embodiment. However, the reference numerals and the like in the following description are not intended to limit the constituent elements in the claims to the members and the like specifically shown in the embodiments.

  [1] A pair of signal lines (11), an insulator (12) covering the pair of signal lines (11), and an identification symbol (16) printed on the surface covering the insulator (12) A shielded cable (10, 20) having a printing layer and a transparent outer layer tape (15) wound around the printing layer in a spiral manner and covering the printing layer.

  [2] The shield cable (10) according to [1], wherein the printing layer is a shield tape (13) covering the insulator (12).

  [3] An inner layer tape (13) having a shield tape (13) covering the insulator (12), wherein the print layer is wound around the shield tape (13) by spiral winding, and covers the shield tape (13). 21) The shielded cable (20) according to [1].

  [4] The shielded cable (10, 20) according to the above [2] or [3], in which the shield tape (13) is wound around the insulator (12) by vertical additional winding.

  [5] The shielded cable (10, 20) according to the above [4], wherein the identification symbol (16) is located on the overlapping portion (14) of the vertical side winding of the shield tape (13).

  [6] The shielded cable (10, 20) according to any one of [1] to [5], wherein the insulator (12) does not have a depression in a region directly below the identification symbol (16).

  [7] The shielded cable (10, 20) according to [6], wherein the insulator (12) has an elliptical cross-sectional shape.

  [8] A plurality of the shielded cables (10, 20) according to any one of [1] to [7] are provided, and the plurality of shielded cables (10, 20) are provided with identification symbols (16). A multi-pair cable (50, 60), arranged so that is facing outward.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the invention.

  The embodiments described above do not limit the invention according to the claims. In addition, it should be noted that not all the combinations of features described in the embodiments are essential to the means for solving the problems of the invention.

DESCRIPTION OF SYMBOLS 10, 20 ... Shield cable 11 ... Signal line 12 ... Insulator 13 ... Shield tape 14 ... Overlapping part 15 ... Outer layer tape 16 ... Identification symbol 21 ... Inner layer tape 50, 60 ... Multi-pair cable

Claims (8)

A pair of signal lines;
An insulator covering the pair of signal lines;
A printing layer that covers the insulator and has a symbol printed on the surface;
A transparent outer layer tape wound around the print layer in a spiral manner and covering the print layer;
Having a shielded cable. The printing layer is a shield tape covering the insulator;
The shielded cable according to claim 1. A shield tape covering the insulator;
The printing layer is an inner layer tape that is wound around the shield tape in a spiral manner and covers the shield tape.
The shielded cable according to claim 1. The shield tape is wound around the insulator with vertical side winding,
The shielded cable according to claim 2 or 3. The identification symbol is located on the overlapping portion of the vertical winding of the shield tape,
The shielded cable according to claim 4. The insulator does not have a depression in a region directly below the identification symbol;
The shielded cable according to any one of claims 1 to 5. A radial cross-sectional shape of the insulator is an ellipse,
The shielded cable according to claim 6. A plurality of shielded cables according to any one of claims 1 to 7,
The plurality of shielded cables are arranged such that each of the identification symbols faces outward.
Multi-pair cable.

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