JP2021157868A - Multi-core cable - Google Patents

Abstract

To provide a multi-core cable that simplifies manufacturing work.SOLUTION: A multi-core cable has, in a cross-sectional view orthogonal to the longitudinal direction, an annular first shield layer, a second shield layer that covers the outer periphery of the first shield layer, and an even number of first signal lines arranged between the first shield layer and the second shield layer.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to a multi-core cable.

A multi-core cable including a plurality of cables for differential signal electric wires having an elliptical cross section in which two signal lines are collectively covered with an insulator layer and the insulator layer is covered with a metal layer is known. (For example, Patent Document 1).

JP-A-2019-175678

With conventional multi-core cables, it is easy to take time and effort to manufacture cables for differential signal wires. In addition, it is easy to take time and effort to stabilize the posture and position of the cable for the differential signal wire inside the jacket. If the posture and position of the differential signal wire cable are unstable inside the jacket, the diameter of the multi-core cable may increase.

It is an object of the present disclosure to provide a multi-core cable that can simplify the work involved in manufacturing.

The multi-core cable of the present disclosure includes an annular first shield layer, a second shield layer that covers the outer periphery of the first shield layer, the first shield layer, and the second shield in a cross-sectional view orthogonal to the longitudinal direction. It has an even number of first signal lines arranged between the layers.

According to the present disclosure, the work required for manufacturing can be simplified.

FIG. 1 is a cross-sectional view showing a multi-core cable according to an embodiment.

The embodiment for carrying out will be described below.

[Explanation of Embodiments of the present disclosure]

[1] The multi-core cable according to one aspect of the present disclosure includes an annular first shield layer, a second shield layer covering the outer periphery of the first shield layer, and the first shield layer in a cross-sectional view orthogonal to the longitudinal direction. It has an even number of first signal lines arranged between the shield layer and the second shield layer.

Since an even number of first signal lines is arranged between the first shield layer and the second shield layer, it is easy to densely arrange the even first signal lines when manufacturing a multi-core cable. .. Therefore, the work required for manufacturing the multi-core cable can be simplified.

[2] In [1], the even number of first signal lines may be arranged in the circumferential direction of the first shield layer in the cross-sectional view. In this case, the dense arrangement of the even number of first signal lines is particularly easy.

[3] In [1] or [2], the first signal line has a first conductor and a first insulating layer made of an insulating material provided in contact with the outer periphery of the first conductor. May be good. In this case, it is not necessary to use a coaxial electric wire as the first signal line, and the diameter of the multi-core cable can be easily reduced.

[4] In [3], the outer periphery of the first insulating layer may include a portion exposed in the space between the first shield layer and the second shield layer. In this case, the outer circumference of the first insulating layer is not provided with a shield layer or the like that contacts the entire circumference, and the diameter of the multi-core cable can be easily reduced.

[5] In [1] to [4], the first shield layer and the second shield layer may include a metal tape, a braided shield or a horizontal winding shield, or any combination thereof. In this case, it is easy to obtain a stable shielding effect.

[6] In [1] to [5], there may be a first drain wire that contacts the first shield layer and a second drain wire that contacts the second shield layer. In this case, it is easy to obtain a stable shielding effect.

[7] In [1] to [6], in the cross-sectional view, the third shield layer covering the outer periphery of the second shield layer is arranged between the second shield layer and the third shield layer. It may have an even number of second signal lines. Since an even number of second signal lines is arranged between the second shield layer and the third shield layer, it is easy to densely arrange the even number of second signal lines when manufacturing a multi-core cable. .. Therefore, even when an even number of second signal lines are included, the work required for manufacturing the multi-core cable can be simplified.

[8] In [7], the even number of second signal lines may be arranged in the circumferential direction of the first shield layer in the cross-sectional view. In this case, the dense arrangement of the even number of second signal lines is particularly easy.

[9] In [7] or [8], the second signal line has a second conductor and a second insulating layer made of an insulating material provided in contact with the outer periphery of the second conductor. May be good. In this case, it is not necessary to use a coaxial electric wire as the second signal line, and the diameter of the multi-core cable can be easily reduced.

[10] In [9], the outer periphery of the second insulating layer may include a portion exposed in the space between the second shield layer and the third shield layer. In this case, the outer circumference of the second insulating layer is not provided with a shield layer or the like that contacts the entire circumference, and the diameter of the multi-core cable can be easily reduced.

[11] In [7] to [10], the third shield layer may include a metal tape, a braided shield or a horizontal winding shield, or any combination thereof. In this case, it is easy to obtain a stable shielding effect.

[12] In [7] to [11], a third drain wire that contacts the third shield layer may be provided. In this case, it is easy to obtain a stable shielding effect.

[13] In [7] to [12], the number of the first signal lines may be eight, and the number of the second signal lines may be 14. In this case, the multi-core cable can be used, for example, as a full configuration cable defined in the camera link standard.

[14] In [1] to [13], there may be an electric wire in contact with the inner circumference of the first shield layer in the cross-sectional view. In this case, it is easy to stabilize the arrangement of the first signal line and the like.

[15] In [1] to [13], the insulating layer may be provided in contact with the inner circumference of the first shield layer in the cross-sectional view. In this case, it is easy to stabilize the arrangement of the first signal line and the like.

[16] The multi-core cable according to another aspect of the present disclosure includes an annular first metal tape, a second metal tape covering the outer periphery of the first metal tape, and the above, in a cross-sectional view orthogonal to the longitudinal direction. A third metal tape covering the outer periphery of the second metal tape, a braided shield provided on the outer periphery of the third metal tape, and eight pieces arranged between the first metal tape and the second metal tape. The first signal line, 14 second signal lines arranged between the second metal tape and the third metal tape, an electric wire in contact with the inner circumference of the first metal tape, and the first metal tape. The eight first signals have a first drain wire in contact with the metal tape, a second drain wire in contact with the second metal tape, and a third drain wire in contact with the third metal tape. The lines are arranged in the circumferential direction of the first metal tape, and the 14 second signal lines are arranged in the circumferential direction of the first metal tape.

When manufacturing a multi-core cable, it is easy to densely arrange an even number of first signal lines and an even number of second signal lines. Therefore, the work required for manufacturing the multi-core cable can be simplified.

[Details of Embodiments of the present disclosure]
Hereinafter, embodiments of the present disclosure will be described in detail, but the present embodiments are not limited thereto. In the present specification and the drawings, components having substantially the same functional configuration may be designated by the same reference numerals to omit duplicate explanations.

Hereinafter, the description will be made based on a cross-sectional view orthogonal to the longitudinal direction of the multi-core cable. FIG. 1 is a cross-sectional view showing a multi-core cable according to an embodiment. FIG. 1 shows a cross section orthogonal to the longitudinal direction of the multi-core cable.

The multi-core cable 1 according to the present embodiment has one power supply line 50, eight first signal lines 10, and 14 second signal lines 20.

The power supply line 50 has a conductor 51 and an insulating layer 52 made of an insulating material provided in contact with the outer periphery of the conductor 51. The power supply line 50 has, for example, a circular cross-sectional shape. The outer circumference of the conductor 51 is covered with an insulating layer 52. The conductor 51 may be made of, for example, copper or a copper alloy. A tin-plated annealed copper wire, an annealed copper wire, or a hard copper wire may be used for the conductor 51. The insulating layer 52 may be made of, for example, polyethylene, polypropylene, foamed polyolefin, or fluororesin. The power supply line 50 is an example of an electric wire.

The multi-core cable 1 has a first metal tape 31 that covers the power supply line 50. The first metal tape 31 is provided on the outer circumference of the power supply line 50. The first metal tape 31 has an outer circumference 31A and an inner circumference 31B, and the inner circumference 31B comes into contact with the insulating layer 52. For example, the entire inner circumference 31B comes into contact with the insulating layer 52. The first metal tape 31 has an annular cross-sectional shape, preferably an annular cross-sectional shape. The first metal tape 31 is an example of the first shield layer. As the first shield layer, a braided shield or a horizontal winding shield may be used instead of the metal tape. The first shield layer may include a metal tape, a braided shield or a side-wound shield, or may include any combination thereof. When the first shield layer contains a metal tape, a braided shield or a horizontal winding shield, or any combination thereof, a stable shielding effect can be easily obtained. As the material of the first shield layer, for example, copper, a copper alloy, aluminum or an aluminum alloy may be used.

The diameter of the composite composed of the first metal tape 31 and the power supply line 50 inside the first metal tape 31 may be, for example, 1.0 mm or more and 2.0 mm or less.

Each of the eight first signal lines 10 has a first conductor 11 and a first insulating layer 12 made of an insulating material provided in contact with the outer periphery of the first conductor 11. The first signal line 10 has, for example, a circular cross-sectional shape. The outer circumference of the first conductor 11 is covered with the first insulating layer 12. The first conductor 11 may be made of, for example, copper or a copper alloy. A tin-plated annealed copper wire, an annealed copper wire, or a hard copper wire may be used for the first conductor 11. The first insulating layer 12 may be made of, for example, polyethylene, polypropylene, foamed polyolefin, or fluororesin. The diameter of the first signal line 10 may be, for example, 0.5 mm or more and 1.5 mm or less. The diameter of the first signal line 10 may be equal among the eight first signal lines 10, and the diameter of some of the first signal lines 10 is different from the diameter of the other first signal lines 10. May be good.

The eight first signal lines 10 are arranged side by side in the circumferential direction of the power supply line 50. The eight first signal lines 10 are arranged on the outer circumference 31A of the first metal tape 31. The first signal line 10 has an outer circumference of 10A. In each first signal line 10, a part of the outer circumference 10A comes into contact with a part of the outer circumference 31A of the first metal tape 31 over the entire longitudinal direction of the power supply line 50. It is preferable that the outer circumferences 10A are in contact with each other between the first signal lines 10 adjacent to each other in the circumferential direction of the power supply line 50. For example, the eight first signal lines 10 have four pairs of two adjacent lines, and a differential signal is transmitted to the two first signal lines 10 included in each pair.

The multi-core cable 1 has a second metal tape 32 that bundles and covers eight first signal lines 10 arranged on the outer circumference 31A of the first metal tape 31. The second metal tape 32 has an outer circumference 32A and an inner circumference 32B. In each first signal line 10, a part of the outer circumference 10A contacts a part of the inner circumference 32B of the second metal tape 32 over the entire longitudinal direction of the power supply line 50. The second metal tape 32 has an annular cross-sectional shape. In cross-sectional view, the outer circumference 32A and the inner circumference 32B have a shape between, for example, an octagon and a circle. In a cross-sectional view, the second metal tape 32 covers the outer circumference 31A of the first metal tape 31 via the first signal line 10, and eight first signal lines 10 form the first metal tape 31 and the second metal tape 32. It is placed between and. The second metal tape 32 is an example of the second shield layer. As the second shield layer, a braided shield or a horizontal winding shield may be used instead of the metal tape. The second shield layer may include a metal tape, a braided shield or a side-wound shield, or may include any combination thereof. When the second shield layer contains a metal tape, a braided shield or a horizontal winding shield, or any combination thereof, a stable shielding effect can be easily obtained. As the material of the second shield layer, for example, copper, a copper alloy, aluminum or an aluminum alloy may be used.

The diameter of the composite composed of the second metal tape 32 and the first signal line 10 or the like inside the second metal tape 32 may be, for example, 3.0 mm or more and 4.0 mm or less.

Each of the 14 second signal lines 20 has a second conductor 21 and a second insulating layer 22 made of an insulating material provided in contact with the outer periphery of the second conductor 21. The second signal line 20 has, for example, a circular cross-sectional shape. The outer circumference of the second conductor 21 is covered with the second insulating layer 22. The second conductor 21 may be made of, for example, copper or a copper alloy. A tin-plated annealed copper wire, an annealed copper wire, or a hard copper wire may be used for the second conductor 21. The second insulating layer 22 may be made of, for example, polyethylene, polypropylene, foamed polyolefin, or fluororesin. The diameter of the second signal line 20 may be, for example, 0.5 mm or more and 1.5 mm or less. The diameter of the second signal line 20 may be equal among the 14 second signal lines 20, and the diameter of some of the second signal lines 20 is different from the diameter of the other second signal lines 20. May be good. The diameter of the second signal line 20 may be equal to the diameter of the first signal line 10 or may be different from the diameter of the first signal line 10.

The 14 second signal lines 20 are arranged side by side in the circumferential direction of the power supply line 50. The 14 second signal lines 20 are arranged on the outer circumference 32A of the second metal tape 32. The second signal line 20 has an outer circumference 20A. In each second signal line 20, a part of the outer circumference 20A contacts a part of the outer circumference 32A of the second metal tape 32 over the entire longitudinal direction of the power supply line 50. It is preferable that the outer circumferences 20A are in contact with each other between the second signal lines 20 adjacent to each other in the circumferential direction of the power supply line 50. For example, the 14 second signal lines 20 have 7 pairs of two adjacent lines, and a differential signal is transmitted to the two second signal lines 20 included in each pair.

The multi-core cable 1 has a third metal tape 33 that bundles and covers 14 second signal lines 20 arranged on the outer circumference 32A of the second metal tape 32. The third metal tape 33 has an outer circumference 33A and an inner circumference 33B. In each second signal line 20, a part of the outer circumference 20A contacts a part of the inner circumference 33B of the third metal tape 33 over the entire longitudinal direction of the power supply line 50. The third metal tape 33 has an annular cross-sectional shape. In cross-sectional view, the outer circumference 33A and the inner circumference 33B have a shape between, for example, a tetradecagon and a circle.

The multi-core cable 1 has a braided shield 34 that covers the third metal tape 33. The braided shield 34 is provided on the outer circumference 33A of the third metal tape 33. For example, the entire outer circumference 33A of the third metal tape 33 comes into contact with the braided shield 34. In a cross-sectional view, the third metal tape 33 and the braided shield 34 cover the outer circumference 32A of the second metal tape 32 via the second signal line 20, and the 14 second signal lines 20 are the second metal tape 32 and the second metal tape 32. 3 It is arranged between the metal tape 33 and the braided shield 34. The third metal tape 33 and the braided shield 34 are included in the third shield layer 35. The third shield layer 35 may be composed of the third metal tape 33 or the braided shield 34. A horizontal winding shield may be used as the third shield layer. The third shield layer may include a metal tape, a braided shield or a side-wound shield, or may include any combination thereof. When the third shield layer contains a metal tape, a braided shield or a horizontal winding shield, or any combination thereof, a stable shielding effect can be easily obtained. As the material of the third shield layer, for example, copper, a copper alloy, aluminum or an aluminum alloy may be used.

The diameter of the composite composed of the braided shield 34, the third metal tape 33, the second signal line 20 inside them, and the like may be, for example, 5.0 mm or more and 6.0 mm or less.

The multi-core cable 1 includes a first drain wire 41 that contacts the first metal tape 31, a second drain wire 42 that contacts the second metal tape 32, and a third drain wire 43 that contacts the third metal tape 33. Has. For example, the first drain wire 41 contacts the outer circumference 31A of the first metal tape 31, the second drain wire 42 contacts the outer circumference 32A of the second metal tape 32, and the third drain wire 43 contacts the outer circumference 32A of the third metal tape 33. It contacts the inner circumference 33B. The second drain wire 42 may come into contact with the inner circumference 32B of the second metal tape 32.

The first signal line 10 is different from the coaxial electric wire, and the first signal line 10 is not provided with a shield layer that contacts the outer periphery of the first insulating layer 12 over the entire circumference. For example, the first insulating layer 12 is provided. It comes into contact with the first metal tape 31 and the second metal tape 32. For example, the outer circumference of the first insulating layer 12 includes a portion exposed in the space between the first metal tape 31 and the second metal tape 32. The outer periphery of the first insulating layer 12 is the first, except for a portion that comes into contact with, for example, the first metal tape 31, the second metal tape 32, the first drain line 41, the second drain line 42, or the adjacent first signal line 10. It is exposed in the space between the 1 metal tape 31 and the 2nd metal tape 32.

The second signal line 20 is different from the coaxial electric wire, and the second signal line 20 is not provided with a shield layer that contacts the outer circumference of the second insulating layer 22 over the entire circumference. For example, the second insulating layer 22 is provided. It comes into contact with the second metal tape 32 and the third metal tape 33. For example, the outer circumference of the second insulating layer 22 includes a portion exposed in the space between the second metal tape 32 and the third metal tape 33. The outer periphery of the second insulating layer 22 is the first, except for a portion that comes into contact with, for example, the second metal tape 32, the third metal tape 33, the second drain line 42, the third drain line 43, or the adjacent second signal line 20. It is exposed in the space between the 2 metal tape 32 and the 3rd metal tape 33.

The multi-core cable 1 has an outer cover 60 that covers the braided shield 34. The diameter of the multi-core cable 1 may be, for example, 7.0 mm or more and 8.0 mm or less.

In the multi-core cable 1, eight first signal lines 10 are arranged between the first metal tape 31 and the second metal tape 32. Therefore, when manufacturing the multi-core cable 1, it is easy to densely arrange the eight first signal lines 10. Further, since the first signal lines 10 are arranged side by side in the circumferential direction of the power supply line 50, that is, in the circumferential direction of the first metal tape 31 in the cross-sectional view, the eight first signal lines 10 are densely arranged. Especially easy.

Similarly, 14 second signal lines 20 are arranged between the second metal tape 32 and the third metal tape 33. Therefore, when manufacturing the multi-core cable 1, it is easy to densely arrange the 14 second signal lines 20. Further, since the second signal lines 20 are arranged side by side in the circumferential direction of the power supply line 50, that is, in the circumferential direction of the second metal tape 32 in the cross-sectional view, the 14 second signal lines 20 are densely arranged. Especially easy.

The first signal line 10 may include a first conductor 11 and a first insulating layer 12, and a coaxial electric wire may not be used for the first signal line 10. Similarly, the second signal line 20 may include the second conductor 21 and the second insulating layer 22, and the second signal line 20 does not have to use a coaxial electric wire. Therefore, the diameter of the multi-core cable 1 can be easily reduced. For example, the outer periphery of the first insulating layer 12 may include a portion exposed in the space between the first metal tape 31 and the second metal tape 32, and the outer periphery of the second insulating layer 22 may include the second metal tape 32. A portion exposed in the space between the metal tape 33 and the third metal tape 33 may be included.

The multi-core cable 1 includes a first drain wire 41 that contacts the first metal tape 31, a second drain wire 42 that contacts the second metal tape 32, and a third drain wire 43 that contacts the third metal tape 33. Has. Therefore, it is easy to obtain a stable shielding effect.

The multi-core cable 1 has eight first signal lines 10 and 14 second signal lines 20. That is, the multi-core cable 1 includes 22 signal lines. Therefore, the multi-core cable 1 can be used, for example, as a full-configuration cable defined in the camera link standard.

Since the multi-core cable 1 includes a power supply line 50, power can be supplied through the multi-core cable 1. Further, since the power supply line 50 is an electric wire including the conductor 51, it is easy to stabilize the arrangement of the first signal line 10 and the like. A plurality of power supply lines may be combined and arranged inside the first metal tape 31. Further, an insulating layer in contact with the inner circumference 31B of the first metal tape 31 may be arranged inside the first metal tape 31 instead of the electric wire including the conductor. This insulating layer may be solid or hollow. Even when the insulating layer is arranged, the arrangement of the first signal line 10 and the like can be stabilized.

The term "circle" in the present disclosure does not mean a circle in a strict sense, but may be a shape that can be regarded as a circle according to social conventions, and is not a perfect mathematical circle. You may. For example, fine irregularities may be present on the outer circumference of the metal tape and the outer circumference of the signal line.

Although the embodiments have been described in detail above, the embodiments are not limited to the specific embodiments, and various modifications and changes can be made within the scope of the claims. For example, it can be applied not only to a multi-core cable according to a specific standard but also to various multi-core cables.

1: Multi-core cable 10: First signal line 10A: Outer circumference 11: First conductor 12: First insulating layer 20: Second signal line 20A: Outer circumference 21: Second conductor 22: Second insulating layer 31: First metal Tape 31A: Outer circumference 31B: Inner circumference 32: Second metal tape 32A: Outer circumference 32B: Inner circumference 33: Third metal tape 33A: Outer circumference 33B: Inner circumference 34: Braided shield 35: Third shield layer 41: First drain wire 42: 2nd drain wire 43: 3rd drain wire 50: Power supply wire 51: Conductor 52: Insulation layer 60: Cover

Claims (16)

In a cross-sectional view orthogonal to the longitudinal direction
An annular first shield layer and
A second shield layer that covers the outer circumference of the first shield layer and
An even number of first signal lines arranged between the first shield layer and the second shield layer, and
Multi-core cable with. The multi-core cable according to claim 1, wherein the even-numbered first signal lines are arranged in the circumferential direction of the first shield layer in the cross-sectional view. The first signal line is
With the first conductor
A first insulating layer made of an insulating material provided in contact with the outer periphery of the first conductor, and
The multi-core cable according to claim 1 or 2. The multi-core cable according to claim 3, wherein the outer periphery of the first insulating layer includes a portion exposed in a space between the first shield layer and the second shield layer. The multi-core cable according to any one of claims 1 to 4, wherein the first shield layer and the second shield layer include a metal tape, a braided shield or a horizontal winding shield, or any combination thereof. The first drain wire in contact with the first shield layer and
The second drain wire in contact with the second shield layer and
The multi-core cable according to any one of claims 1 to 5. In the cross-sectional view,
A third shield layer that covers the outer circumference of the second shield layer and
An even number of second signal lines arranged between the second shield layer and the third shield layer, and
The multi-core cable according to any one of claims 1 to 6. The multi-core cable according to claim 7, wherein the even-numbered second signal lines are arranged in the circumferential direction of the first shield layer in the cross-sectional view. The second signal line is
With the second conductor
A second insulating layer made of an insulating material provided in contact with the outer periphery of the second conductor, and
7. The multi-core cable according to claim 7 or 8. The multi-core cable according to claim 9, wherein the outer periphery of the second insulating layer includes a portion exposed in a space between the second shield layer and the third shield layer. The multi-core cable according to any one of claims 7 to 10, wherein the third shield layer includes a metal tape, a braided shield or a horizontal winding shield, or any combination thereof. The multi-core cable according to any one of claims 7 to 11, which has a third drain wire in contact with the third shield layer. The number of the first signal lines is eight.
The multi-core cable according to any one of claims 7 to 12, wherein the number of the second signal lines is 14. The multi-core cable according to any one of claims 1 to 13, which has an electric wire in contact with the inner circumference of the first shield layer in the cross-sectional view. The multi-core cable according to any one of claims 1 to 13, which has an insulating layer in contact with the inner circumference of the first shield layer in the cross-sectional view. In a cross-sectional view orthogonal to the longitudinal direction
An annular first metal tape and
A second metal tape that covers the outer circumference of the first metal tape, and
A third metal tape that covers the outer circumference of the second metal tape, and
A braided shield provided on the outer circumference of the third metal tape and
Eight first signal lines arranged between the first metal tape and the second metal tape, and
The 14 second signal lines arranged between the second metal tape and the third metal tape, and
An electric wire that contacts the inner circumference of the first metal tape and
The first drain wire in contact with the first metal tape and
The second drain wire in contact with the second metal tape and
The third drain wire in contact with the third metal tape and
Have,
The eight first signal lines are arranged in the circumferential direction of the first metal tape.
The 14 second signal lines are multi-core cables arranged in the circumferential direction of the first metal tape.

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