Shielded cables, shielded cables with printed circuit boards, and multi-core cables

Abstract

To provide a shield cable downsized while obtaining the quality of an excellent high frequency signal; a shield cable having a substrate; and a multicore cable.SOLUTION: A shield cable includes: a first insulated wire including a first central conductor and a first insulating layer provided in the periphery of the first central conductor; a second insulated wire including a second central conductor and a second insulating layer provided in the periphery of the second central conductor and arranged in parallel to the first insulated wire; a third insulating layer provided in the periphery of the first insulated wire and the second insulated wire; a shield layer provided in the periphery of the third insulating layer; a drain line contacting the shield layer; and a fourth insulating layer provided in the periphery of the shield layer and the drain line.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a shielded cable, a substrate-attached shielded cable, and a multi-core cable. [Background technology]

[0002] A shielded cable has been proposed that includes a conductive shielding tape wrapped around a pair of insulated electric wires arranged in parallel, and an insulating tape wrapped around the outside of the shielding tape (Patent Documents 1 to 4). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2018-060685 A [Patent Document 2] JP 2018-067435 A [Patent Document 3] International Publication No. 2019 / 082437 [Patent Document 4] International Publication No. 2019 / 131500 Summary of the Invention [Problem to be solved by the invention]

[0004] Although the shielded cable described in Patent Document 1 achieves the intended purpose, there has been a demand in recent years for further miniaturization of shielded cables.

[0005] An object of the present disclosure is to provide a shielded cable, a shielded cable with a substrate, and a multi-core cable that can be miniaturized while maintaining good high-frequency signal quality. [Means for solving the problem]

[0006] The shielded cable of the present disclosure includes a first insulated wire including a first central conductor and a first insulating layer arranged around the first central conductor, a second central conductor and a second insulating layer arranged around the second central conductor, a second insulated wire arranged parallel to the first insulated wire, a third insulating layer arranged around the first insulated wire and the second insulated wire, a shielding layer arranged around the third insulating layer, a drain wire in contact with the shielding layer, and a fourth insulating layer arranged around the shielding layer and the drain wire. Effect of the Invention

[0007] According to the present disclosure, it is possible to achieve miniaturization while maintaining good high frequency signal quality. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a cross-sectional view showing a shielded cable according to a first embodiment. [Diagram 2] FIG. 2 is a schematic diagram showing a first example of a usage pattern of the shielded cable according to the first embodiment. [Diagram 3] FIG. 3 is a cross-sectional view (part 1) showing a first example of a usage pattern of the shielded cable according to the first embodiment. [Figure 4] FIG. 4 is a cross-sectional view (part 2) showing a first example of a usage pattern of the shielded cable according to the first embodiment. [Diagram 5] FIG. 5 is a schematic diagram showing a second example of the usage of the shielded cable according to the first embodiment. [Figure 6] FIG. 6 is a cross-sectional view showing a second example of the usage pattern of the shielded cable according to the first embodiment. [Figure 7] FIG. 7 is a schematic diagram showing a third example of the usage form of the shielded cable according to the first embodiment. [Figure 8] FIG. 8 is a cross-sectional view showing a third example of the usage pattern of the shielded cable according to the first embodiment. [Figure 9] FIG. 9 is a cross-sectional view showing a shielded cable according to the second embodiment. [Figure 10] FIG. 10 is a cross-sectional view showing a shielded cable according to a third embodiment. [Figure 11] FIG. 11 is a cross-sectional view showing a multi-core cable according to the fourth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] [Description of the embodiments of the present disclosure] First, the embodiments of the present disclosure will be listed and described.

[0010] [1] A shielded cable according to one embodiment of the present disclosure includes a first insulated wire including a first central conductor and a first insulating layer arranged around the first central conductor, a second central conductor and a second insulating layer arranged around the second central conductor, a second insulated wire arranged parallel to the first insulated wire, a third insulating layer arranged around the first insulated wire and the second insulated wire, a shielding layer arranged around the third insulating layer, a drain wire in contact with the shielding layer, and a fourth insulating layer arranged around the shielding layer and the drain wire.

[0011] A third insulating layer is provided between the first and second insulated wires and the shielding layer. Therefore, even if the distance between the first and second central conductors is reduced, the impedance can be appropriately adjusted. Therefore, the distance between the first and second central conductors can be reduced to reduce the size while maintaining good high-frequency signal quality.

[0012] [2] In [1], the distance between the first central conductor and the second central conductor may be less than twice the distance between the first central conductor and the shielding layer, and less than twice the distance between the second central conductor and the shielding layer. In this case, it is easy to miniaturize the shielded cable.

[0013] [3] In the configuration of [1] or [2], the drain wire has a flat plate shape. In this case, it is easy to reduce the thickness of the shielded cable.

[0014] [4] In any one of [1] to [3], the first insulating layer may have a first solid layer provided around the first central conductor, and the second insulating layer may have a second solid layer provided around the second central conductor. In this case, it is easy to ensure desired mechanical strength in the first insulated wire and the second insulated wire.

[0015] [5] In the item [4], the first insulating layer may have a first foamed layer provided around the first solid layer, and the second insulating layer may have a second foamed layer provided around the second solid layer. In this case, it is easy to obtain a desired impedance for the first insulated wire and the second insulated wire.

[0016] [6] In [5], the first insulating layer may have a third solid layer provided around the first foamed layer, and the second insulating layer may have a fourth solid layer provided around the second foamed layer. In this case, it is easier to obtain desired impedances for the first insulated wire and the second insulated wire.

[0017] [7] In [6], the third insulating layer may be thicker than the first solid layer, the second solid layer, the third solid layer, and the fourth solid layer. In this case, it is easy to adjust the impedance while reducing the distance between the first central conductor and the second central conductor.

[0018] [8] In any of [1] to [7], the shielding layer may have a plating layer formed on an outer circumferential surface of the third insulating layer, which makes it easier to improve the transmission quality of high-frequency signals.

[0019] [9] In any of [1] to [7], the shield layer may have a metal foil with which the drain wire is in contact, which makes it easier to manufacture the shielded cable.

[0020]

[10] In the item [9], the drain wire may be provided between the metal foil and the fourth insulating layer, which makes it easier to wrap a shielding layer around the third insulating layer.

[0021]

[11] In the configuration of [9], the drain wire may be provided between the third insulating layer and the metal foil. In this case, the drain wire can be easily provided on the third insulating layer.

[0022] [1 2 A shielded cable according to another embodiment of the present disclosure includes a first insulated wire including a first central conductor and a first insulating layer provided around the first central conductor, a second central conductor and a second insulating layer provided around the second central conductor, and further includes a second insulated wire arranged parallel to the first insulated wire, a third insulating layer provided around the first insulated wire and the second insulated wire, a shielding layer provided around the third insulating layer, a drain wire in contact with the shielding layer, and a fourth insulating layer provided around the shielding layer and the drain wire, wherein a distance between the first central conductor and the second central conductor is equal to or larger than a distance between the first central conductor and the second central conductor. the drain wire has a flat shape, the first insulating layer has a first solid layer provided around the first center conductor, a first foamed layer provided around the first solid layer, and a third solid layer provided around the first foamed layer, the second insulating layer has a second solid layer provided around the second center conductor, a second foamed layer provided around the second solid layer, and a fourth solid layer provided around the second foamed layer, and the shielding layer has a plating layer formed on the outer peripheral surface of the third insulating layer.

[0023] A third insulating layer is provided between the first and second insulated wires and the shielding layer. The distance between the first and second central conductors is 1.6 times or less the distance between the first and second central conductors and the shielding layer, and is 1.6 times or less the distance between the second central conductor and the shielding layer. This allows the distance between the first and second central conductors to be reduced, thereby making the device more compact, while still providing good high-frequency signal quality.

[0024] [1 3 A substrate-attached shielded cable according to another embodiment of the present disclosure comprises: 2and a substrate connected to the shielded cable, the substrate comprising an insulating substrate, a first conductor layer electrically connected to the first central conductor, a second conductor layer electrically connected to the second central conductor, and a third conductor layer electrically connected to the drain wire, the first conductor layer, the second conductor layer, and the third conductor layer being provided on a surface of the insulating substrate, the first conductor layer, the second conductor layer, and the third conductor layer extending parallel to each other, and the third conductor layer being disposed between the first conductor layer and the second conductor layer. In this case, it is possible to miniaturize the substrate-attached shielded cable while obtaining good high-frequency signal quality.

[0025] [1 4 A substrate-attached shielded cable according to another embodiment of the present disclosure comprises: 2 and a substrate connected to the shielded cable, the substrate comprising an insulating substrate, a first conductor layer electrically connected to the first central conductor, a second conductor layer electrically connected to the second central conductor, and a third conductor layer electrically connected to the drain wire, the first conductor layer, the second conductor layer, and the third conductor layer being provided on a surface of the insulating substrate, the insulating substrate being in contact with a portion of the fourth insulating layer on the side opposite to the first central conductor and the second central conductor with respect to the drain wire, the first conductor layer and the second conductor layer extending parallel to each other, and the third conductor layer extending in a direction perpendicular to the direction in which the first conductor layer extends. In this case, it is possible to miniaturize the substrate-attached shielded cable while obtaining good quality of high frequency signals.

[0026] [1 5 A multi-core cable according to another embodiment of the present disclosure includes a plurality of [1] to [1 2 and an outer sheath enclosing the plurality of shielded cables.

[0027] In the shielded cable included in the multi-core cable, good high-frequency signal quality can be obtained while being miniaturized. Therefore, the multi-core cable can also be miniaturized. Furthermore, the multi-core cable can transmit a large capacity signal.

[0028] [Details of the embodiment of the present disclosure] Hereinafter, the embodiments of the present disclosure will be described in detail, but the present disclosure is not limited thereto. In this specification and drawings, components having substantially the same functional configurations may be denoted by the same reference numerals to avoid redundant description.

[0029] (First embodiment) A first embodiment will be described. The first embodiment relates to a shielded cable. Fig. 1 is a cross-sectional view showing a shielded cable according to the first embodiment. Fig. 1 shows a cross section perpendicular to the longitudinal direction (first direction) of the shielded cable.

[0030] The shielded cable 1 according to the first embodiment is, for example, a twin-ax cable. As shown in Fig. 1, the shielded cable 1 mainly includes an insulated wire 10, an insulated wire 20, an insulating layer 30, a shield layer 40, a drain wire 50, and an insulating layer 60. The insulated wire 10 and the insulated wire 20 are arranged parallel to each other. For example, the insulated wire 10 and the insulated wire 20 are arranged in a direction (second direction) perpendicular to the longitudinal direction. The insulated wire 10 and the insulated wire 20 are in contact with each other.

[0031] The insulated wire 10 has a central conductor 11 and an insulating layer 12 provided around the central conductor 11. The insulating layer 12 covers the periphery of the central conductor 11. The insulating layer 12 includes a solid layer 13 (inner solid layer), a foamed layer 14, and a solid layer 15 (outer solid layer). The central conductor 11 is an example of a first central conductor. The insulating layer 12 is an example of a first insulating layer.

[0032] The material of the central conductor 11 is a metal such as copper or aluminum. The central conductor 11 may be plated with tin, silver, or the like. The central conductor 11 may be a solid wire or a twisted wire. The dimensions of the central conductor 11 are, for example, AWG34 to AWG22 according to the AWG (American Wire Gauge) standard. For AWG34, the diameter is 0.160 mm, and for AWG22, the diameter is 0.643 mm.

[0033] The solid layer 13 is provided around the central conductor 11. The solid layer 13 contacts the outer peripheral surface of the central conductor 11. The solid layer 13 covers the outer peripheral surface of the central conductor 11. The material of the solid layer 13 is, for example, polyethylene (PE), polypropylene (PP), or an olefin-based thermoplastic elastomer (TPO). The thickness of the solid layer 13 is, for example, 0.01 mm or more and 1.00 mm or less. The solid layer 13 is an example of a first solid layer.

[0034] The foam layer 14 is provided around the solid layer 13. The foam layer 14 contacts the outer peripheral surface of the solid layer 13. The foam layer 14 covers the outer peripheral surface of the solid layer 13. The material of the foam layer 14 is, for example, PE, PP, or TPO. The thickness of the foam layer 14 is, for example, 0.01 mm or more and 1.00 mm or less. The foam layer 14 is an example of a first foam layer.

[0035] The solid layer 15 is provided around the foam layer 14. The solid layer 15 is in contact with the outer peripheral surface of the foam layer 14. The solid layer 15 covers the outer peripheral surface of the foam layer 14. The material of the solid layer 15 is, for example, PE, PP, or TPO. The thickness of the solid layer 15 is, for example, 0.01 mm or more and 1.00 mm or less. The solid layer 15 is an example of a third solid layer.

[0036] The foamed layer 14 is thicker than the solid layers 13 and 15. The thickness of the solid layers 13 and 15 may be the same as that of the solid layers 13 and 15, or the solid layer 15 may be thicker than the solid layer 13. For example, the thickness of the foamed layer 14 is 0.20 mm, the thickness of the solid layer 13 is 0.08 mm, and the thickness of the solid layer 15 is 0.08 mm.

[0037] The solid layer 13, the foamed layer 14 and the solid layer 15 are formed, for example, by extruding the solid layer 13, the foamed layer 14 and the solid layer 15 together under pressure.

[0038] The insulated wire 20 has a central conductor 21 and an insulating layer 22 provided around the central conductor 21. The insulating layer 22 covers the periphery of the central conductor 21. The insulating layer 22 has a configuration similar to that of the insulating layer 12. The insulating layer 22 includes a solid layer 23 (inner solid layer), a foamed layer 24, and a solid layer 25 (outer solid layer). The central conductor 21 is an example of a second central conductor. The insulating layer 22 is an example of a second insulating layer.

[0039] The material of the central conductor 21 is a metal such as copper or aluminum. The central conductor 21 may be plated with tin, silver, or the like. The central conductor 21 may be a solid wire or a twisted wire. The size of the central conductor 21 is, for example, AWG34 to AWG22 according to the AWG standard.

[0040] The solid layer 23 is provided around the central conductor 21. The solid layer 23 is in contact with the outer peripheral surface of the central conductor 21. The solid layer 23 covers the outer peripheral surface of the central conductor 21. The material of the solid layer 23 is, for example, PE, PP, or TPO. The thickness of the solid layer 23 is, for example, 0.01 mm or more and 1.00 mm or less. The solid layer 23 is an example of a second solid layer.

[0041] The foam layer 24 is provided around the solid layer 23. The foam layer 24 contacts the outer peripheral surface of the solid layer 23. The foam layer 24 covers the outer peripheral surface of the solid layer 23. The material of the foam layer 24 is, for example, PE, PP, or TPO. The thickness of the foam layer 24 is, for example, 0.01 mm or more and 1.00 mm or less. The foam layer 24 is an example of a second foam layer.

[0042] The solid layer 25 is provided around the foam layer 24. The solid layer 25 contacts the outer peripheral surface of the foam layer 24. The solid layer 25 covers the outer peripheral surface of the foam layer 24. The material of the solid layer 25 is, for example, PE, PP, or TPO. The thickness of the solid layer 25 is, for example, 0.01 mm or more and 1.00 mm or less. The solid layer 25 is an example of a fourth solid layer.

[0043] The foamed layer 24 is thicker than the solid layer 23 and the solid layer 25. The thickness of the solid layer 23 and the solid layer 25 may be the same, or the solid layer 25 may be thicker than the solid layer 23. For example, the thickness of the foamed layer 24 may be 0.20 mm, the thickness of the solid layer 23 may be 0.08 mm, and the thickness of the solid layer 25 may be 0.08 mm.

[0044] The solid layer 23, the foamed layer 24 and the solid layer 25 are formed, for example, by pressurizing and extruding the three layers, ie, the solid layer 23, the foamed layer 24 and the solid layer 25, together.

[0045] The insulating layer 30 is provided around the insulated electric wire 10 and the insulated electric wire 20. The insulating layer 30 contacts the two insulated electric wires 10 and 20 and has a flat upper flat portion, a flat lower flat portion, and a flat portion that is formed between the two insulated electric wires. 10 and insulated wire 20 and has a first circular portion and a second circular portion. The insulating layer 30 contacts a portion of the outer circumferential surface of the insulated electric wire 10 opposite to the insulated electric wire 20 side and a portion of the outer circumferential surface of the insulated electric wire 20 opposite to the insulated electric wire 10 side. The material of the insulating layer 30 is, for example, PE, PP, or TPO. The thickness of the insulating layer 30 is, for example, 0.01 mm or more and 1.00 mm or less. The insulating layer 30 is thicker than the solid layer 13, the solid layer 15, the solid layer 23, and the solid layer 25. The thickness of the insulating layer 30 may be, for example, 0.10 mm. The insulating layer 30 is formed, for example, by tube extrusion. The insulating layer 30 is an example of a third insulating layer.

[0046] The shielding layer 40 includes a resin tape 41 and a metal foil 42. For example, the metal foil 42 is adhered or vapor-deposited on one surface of the resin tape 41. The material of the resin tape 41 is, for example, a resin such as polyethylene terephthalate (PET) or polyvinyl chloride (PVC). The metal foil 42 is, for example, a copper foil or an aluminum foil. The thickness of the shielding layer 40 is, for example, 7 The thickness of the metal foil 42 is, for example, 4The thickness of the shielding layer 40 is not less than 60 μm and not more than 60 μm. The shielding layer 40 is wrapped around the insulating layer 30 in a longitudinal direction such that the resin tape 41 is in contact with the insulating layer 30. Therefore, the resin tape 41 is between the insulating layer 30 and the metal foil 42, and the metal foil 42 is on the outer side of the resin tape 41.

[0047] The drain wire 50 is made of a metal such as copper or aluminum. The drain wire 50 has a flat plate shape. For example, the drain wire 50 has a rectangular cross-sectional shape when viewed from a direction perpendicular to the longitudinal direction, i.e., in a cross-sectional view. The drain wire 50 is provided above the upper flat portion of the insulating layer 30. For example, the thickness of the drain wire 50 is 10 μm or more and 100 μm or less, and the width is 0.1 mm or more and 5.0 mm or less. The drain wire 50 is provided outside the metal foil 42 so as to contact the metal foil 42 of the shield layer 40. The drain wire 50 is, for example, vertically attached. The drain wire 50 is electrically connected to the metal foil 42. The direction in which the insulated wire 10 and the insulated wire 20 are arranged (second direction) is approximately parallel to the width direction of the drain wire 50. When viewed from a direction (third direction) perpendicular to the longitudinal direction (first direction) and perpendicular to the direction in which the insulated wires 10 and 20 are arranged (second direction), i.e., in a plan view, the drain wire 50 overlaps with the contact portion between the insulated wires 10 and 20. Preferably, the center of the drain wire 50 in the width direction overlaps with the contact portion between the insulated wires 10 and 20 in a plan view.

[0048] The insulating layer 60 is provided around the shield layer 40 and the drain wire 50. The material of the insulating layer 60 is, for example, a resin such as PET or PVC. The thickness of the insulating layer 60 is, for example, 4 μm or more and 50 μm or less. The insulating layer 60 is formed, for example, by winding an insulating tape around the shield layer 40 and the drain wire 50 in a spiral shape (horizontal winding). By providing the insulating layer 60 around the shield layer 40 and the drain wire 50, the mechanical strength of the shield layer 40 can be increased and contamination from the outside can be prevented. The insulating layer 60 is not limited to an insulating tape, and may be formed by pressure extrusion or tube extrusion. The insulating layer 60 is an example of a fourth insulating layer.

[0049] In the shielded cable 1 according to the first embodiment, an insulating layer 30 is provided between the insulated wire 10 and the shield layer 40 and between the insulated wire 20 and the shield layer 40. Therefore, even if the distance between the central conductor 11 of the insulated wire 10 and the central conductor 21 of the insulated wire 20 is reduced, the impedance can be appropriately adjusted. As a result, the distance between the central conductor 11 of the insulated wire 10 and the central conductor 21 of the insulated wire 20 can be reduced to reduce the size while maintaining good high-frequency signal quality.

[0050] For example, the distance L12 between the central conductor 11 and the central conductor 21 is smaller than twice the distance L10 between the central conductor 11 and the shield layer 40, and smaller than twice the distance L20 between the central conductor 21 and the shield layer 40. This is because the shielded cable 1 can be easily miniaturized. The distance L12 is preferably 1.8 times or less than the distance L10 and 1.8 times or less than the distance L20, and more preferably 1.6 times or less than the distance L10 and 1.6 times or less than the distance L20. The distance L12 may be about 1.5 times the distance L10 and about 1.5 times the distance L20.

[0051] In this embodiment, the drain wire 50 has a flat plate shape, which makes it easy to reduce the thickness of the shielded cable 1. The drain wire 50 is, for example, a rectangular conductor.

[0052] In this embodiment, the insulated wire 10 includes a solid layer 13, a foam layer 14, and a solid layer 15, and the insulated wire 20 includes a solid layer 23, a foam layer 24, and a solid layer 25. of This makes it easier to stabilize the transmission quality of high-frequency signals.

[0053] The insulated wire 10 may not include the solid layer 15, and the insulated wire 20 may not include the solid layer 25. The insulated wire 10 may not include the foam layer 14 and the solid layer 15, and the insulated wire 20 may not include the foam layer 24 and the solid layer 25. In particular, when it is desired to improve skew or common mode conversion, the insulated wire 10 may not include the foam layer 14, and the insulated wire 20 may not include the foam layer 24. In this case, the insulated wire 10 is formed of the solid layer 13 or the solid layer 15, and the insulated wire 20 is formed of the solid layer 23 or the solid layer 25. In particular, when it is desired to improve insertion loss, it is preferable to provide the foam layer 14 and the foam layer 24. The structure of the insulating layer 12 is not limited to a three-layer structure of the solid layer 13, the foam layer 14, and the solid layer 15, and may be a two-layer structure of the solid layer 13 and the foam layer 14, or may be a two-layer structure of the foam layer 14 and the solid layer 15. Similarly, the structure of the insulating layer 22 is not limited to a three-layer structure of a solid layer 23, a foamed layer 24, and a solid layer 25, but may be a two-layer structure of a solid layer 23 and a foamed layer 24, or a two-layer structure of a foamed layer 24 and a solid layer 25.

[0054] In this embodiment, the drain wire 50 is provided between the metal foil 42 and the insulating layer 60. This makes it easy to wrap the shield layer 40 around the insulating layer 30.

[0055] The width of the drain wire 50 is, for example, equal to or less than the width of the upper flat portion of the insulating layer 30, i.e., the distance between the center of the insulated wire 10 and the center of the insulated wire 20. The width of the drain wire 50 may be equal to or less than the distance L12 between the central conductor 11 and the central conductor 21. When the width of the drain wire 50 is equal to or less than the distance L12, the drain wire 50 can be easily disposed on the upper flat portion of the insulating layer 30 throughout the longitudinal direction.

[0056] Here, the arrangement of the inner end and the outer end of the shield layer 40 that is attached vertically will be described. The inner end of the shield layer 40 is provided on the lower side of the surface 51 of the first circular portion or the second circular portion of the insulating layer 30 (the side where the drain wire 50 is not arranged). The outer end of the shield layer 40 is provided on the lower flat portion of the insulating layer 30, or on the lower side of the surface 51 of the first circular portion or the second circular portion. In other words, when viewed from a direction perpendicular to the longitudinal direction, at least the inner end and the outer end of the shield layer 40 are preferably arranged away from the drain wire 50 in the circumferential direction of the insulating layer 30 so as not to directly overlap with the drain wire 50.

[0057] <Usage of shielded cable 1> Next, a description will be given of a usage form of the shielded cable 1 according to the first embodiment. body It is used in connection with a substrate on which the layers are formed.

[0058] [First example of usage] First, a first example of the usage will be described. The first example of the usage relates to a substrate-mounted shielded cable. Fig. 2 is a schematic diagram showing a first example of the usage of the shielded cable according to the first embodiment. Figs. 3 and 4 are cross-sectional views showing a first example of the usage of the shielded cable according to the first embodiment. Fig. 3 is a cross-sectional view taken along the drain wire, and Fig. 4 is a cross-sectional view taken along the central conductor.

[0059] As shown in FIGS. 2 to 4, the shielded cable 1 is connected to, for example, a substrate 90. The substrate 90 has an insulating base material 95, a signal conductor layer 91, a signal conductor layer 92, and a ground conductor layer 93. The conductor layers 91 to 93 are provided on the surface of the insulating base material 95 and extend parallel to each other. The conductor layer 93 is disposed between the conductor layers 91 and 92. The conductor layer 91 is an example of a first conductor layer, the conductor layer 92 is an example of a second conductor layer, and the conductor layer 93 is an example of a third conductor layer.

[0060] In the first example, the drain wire 50 is disposed on the opposite side to the substrate 90 side with respect to the plane 51 including the central conductor 11 and the central conductor 21. Flat The portion is located closer to the insulating base material 95 than the surface 51. The insulating layer 60 is provided on the insulating base material 95 so as to be in contact with the insulating base material 95. The central conductor 11 is connected to the conductor layer 91 by a bonding material such as solder (not shown), the central conductor 21 is connected to the conductor layer 92 by a bonding material such as solder (not shown), and the drain wire 50 is connected to the conductor layer 93 by a bonding material such as solder (not shown). The bonding materials such as solder are covered with resin 96.

[0061] [Second example of usage] Next, a second example of the usage will be described. The second example of the usage relates to a substrate-mounted shielded cable. Fig. 5 is a schematic diagram showing a second example of the usage of the shielded cable according to the first embodiment. Fig. 6 is a cross-sectional view showing a second example of the usage of the shielded cable according to the first embodiment. Fig. 6 is a cross-sectional view taken along the drain wire.

[0062] In the second example, as shown in Fig. 5 and Fig. 6, the drain wire 50 is disposed on the substrate 90 side with respect to the surface 51 including the central conductor 11 and the central conductor 21. That is, in the second example, Flat The portion is located closer to the insulating base material 95 than the surface 51. The insulating layer 60 is provided on the insulating base material 95 so as to be in contact with the insulating base material 95. The central conductor 11 is connected to the conductor layer 91 by a bonding material such as solder (not shown), the central conductor 21 is connected to the conductor layer 92 by a bonding material such as solder (not shown), and the drain wire 50 is connected to the conductor layer 93 by a bonding material such as solder (not shown). The bonding materials such as solder are covered with resin 96.

[0063] [Third example of usage] Next, a third example of the usage will be described. The third example of the usage relates to a substrate-mounted shielded cable. Fig. 7 is a schematic diagram showing a third example of the usage of the shielded cable according to the first embodiment. Fig. 8 is a cross-sectional view showing a third example of the usage of the shielded cable according to the first embodiment. Fig. 8 is a cross-sectional view taken along the drain wire.

[0064] 7 and 8, in the third example, the conductor layer 93 extends in a direction perpendicular to the direction in which the conductor layers 91 and 92 extend. As in the second example, the drain wire 50 is disposed on the substrate 90 side with respect to the plane 51 including the central conductor 11 and the central conductor 21. That is, in the third example, the upper flat surface of the insulating layer 30 is Flat The portion is located closer to the insulating base material 95 than the surface 51. The insulating layer 60 is provided on the insulating base material 95 so as to be in contact with the insulating base material 95. The insulating base material 95 is in contact with a portion of the insulating layer 60 on the opposite side to the central conductor 11 and the central conductor 21 side with respect to the drain wire 50. The central conductor 11 is connected to the conductor layer 91 by a bonding material such as solder (not shown), and the central conductor 21 is connected to the conductor layer 92 by a bonding material such as solder (not shown). The bonding material such as solder is covered with a resin 96. A part of the insulating layer 60 is stripped off to expose a part of the drain wire 50 from the insulating layer 60, and the drain wire 50 is connected to the conductor layer 93 by a bonding material such as an anisotropic conductive film (not shown).

[0065] Second embodiment A second embodiment will be described. The second embodiment differs from the first embodiment mainly in the positional relationship between the shielding layer 40 and the drain wire 50. Fig. 9 is a cross-sectional view showing a shielded cable according to the second embodiment. Fig. 9 shows a cross section perpendicular to the longitudinal direction of the shielded cable.

[0066] 9, in the shielded cable 2 according to the second embodiment, the drain wire 50 is provided outside the insulating layer 30 so as to be in contact with the insulating layer 30. The drain wire 50 is, for example, attached vertically. The shielding layer 40 is disposed between the insulating layer 30 and the drain wire 50 so that the metal foil 42 is in contact with the insulating layer 30 and the Drain wire 404. The insulating layer 60 is wound around the shield layer 40 in a longitudinal direction. Thus, the metal foil 42 is between the insulating layer 30 and the resin tape 41, and the resin tape 41 is on the outside of the metal foil 42. The drain wire 50 is electrically connected to the metal foil 42. The insulating layer 60 is provided around the shield layer 40. The insulating layer 60 is formed, for example, by winding an insulating tape in a spiral shape (horizontal winding) around the shield layer 40.

[0067] The other configuration is similar to that of the first embodiment.

[0068] The second embodiment also has the effect of achieving a small size while obtaining good high frequency signal quality, similar to the first embodiment. In this embodiment, the drain wire 50 is provided between the insulating layer 30 and the metal foil 42. This makes it easy to provide the drain wire 50 on the insulating layer 30.

[0069] Third embodiment The third embodiment will be described. The third embodiment mainly focuses on the shield layer 40 and insulating layer 60 The third embodiment differs from the first embodiment etc. in terms of the configuration. Fig. 10 is a cross-sectional view showing a shielded cable according to the third embodiment. Fig. 10 shows a cross section perpendicular to the longitudinal direction of the shielded cable.

[0070] As shown in FIG. 10 , the shielded cable 3 according to the third embodiment has a plating layer 43 formed on the outer peripheral surface of the insulating layer 30 as a shielding layer instead of the shielding layer 40. The material of the plating layer 43 is, for example, copper. The thickness of the plating layer 43 is, for example, not less than 0.1 μm and not more than 20 μm. The drain wire 50 is provided outside the plating layer 43 so as to be in contact with the plating layer 43. The drain wire 50 is, for example, attached vertically. The drain wire 50 is electrically connected to the plating layer 43.

[0071] Moreover, the shielded cable 3 has an insulating layer 70 instead of the insulating layer 60. The insulating layer 70 has a first layer 71 and a second layer 72. The material of the first layer 71 and the second layer 72 is, for example, a resin such as PET or PVC. The thickness of the first layer 71 and the second layer 72 is, for example, 4 μm or more and 50 μm or less. The first layer 71 is laminated on one side of the surface 51 and covers a portion of the plating layer 43 on one side of the surface 51 and the drain wire 50. The second layer 72 is laminated on the other side of the surface 51 and covers a portion of the plating layer 43 on the other side of the surface 51. The first layer 71 and the second layer 72 are bonded to each other while continuing to the plating layer 43. The insulating layer 70 has two ears 73 in which the first layer 71 and the second layer 72 are bonded to each other.

[0072] The other configuration is similar to that of the first embodiment.

[0073] The third embodiment also provides the same effects as the first embodiment. In the third embodiment, the plating layer 43 functions as a shielding layer. This makes it easier to stabilize the distance L10 between the plating layer 43 and the central conductor 11 and the distance L20 between the plating layer 43 and the central conductor 21. This makes it easier to improve the transmission quality of high-frequency signals.

[0074] (Fourth embodiment) A fourth embodiment will be described. The fourth embodiment relates to a multi-core cable including the shielded cable 1 according to the first embodiment. Fig. 11 is a cross-sectional view showing the multi-core cable according to the fourth embodiment. Fig. 11 shows a cross section perpendicular to the longitudinal direction of the multi-core cable.

[0075] As shown in FIG. 11, the multi-core cable 4 according to the fourth embodiment includes a plurality of, for example, eight shielded cables 1, a spacer 81, a laminated tape 82, a shielding layer 83, and an outer jacket 84.

[0076] Of the eight shielded cables 1, two shielded cables 1 are twisted together with their drain wires 50 facing outward, and the other six shielded cables 1 are twisted around them with their drain wires 50 facing outward. For example, the twist pitch of the two shielded cables 1 is equal to the twist pitch of the six shielded cables 1. The interposer 81 is provided, for example, between the two twisted shielded cables 1 and the six twisted shielded cables 1. It may also be provided around the six twisted shielded cables 1.

[0077] The laminated tape 82 is provided around the multiple shielded cables 1 and the interposer 81. The laminated tape 82 has, for example, a PET tape and an aluminum foil. The aluminum foil is disposed on the outside of the PET tape. The shielding layer 83 is provided around the laminated tape 82 and is in contact with the aluminum foil of the laminated tape 82. The laminated tape 82 is formed by being wound in a spiral shape (horizontal winding) around the multiple shielded cables 1 and the interposer 81. The shielding layer 83 is, for example, a braid. The outer sheath 84 is provided around the shielding layer 83. The outer sheath 84 encloses the multiple shielded cables 1. Copper foil may be provided between the shielding layer 83 and the outer sheath 84.

[0078] The shielded cable 1 included in the multi-core cable 4 can be made compact while still maintaining good high-frequency signal quality. Therefore, the multi-core cable 4 can also be made compact. Furthermore, the multi-core cable 4 can transmit a large capacity signal. In addition, since the drain wires 50 are arranged to face outward, when connecting the multi-core cable 4 to a board, it is easy to connect the conductor layer of the board and the drain wires 50.

[0079] The multi-core cable 4 may include the shielded cable 2 or 3 instead of the shielded cable 1 .

[0080] Although the embodiments have been described in detail above, the present invention is not limited to the specific embodiments, and various modifications and changes are possible within the scope of the claims. [Explanation of symbols]

[0081] 1, 2, 3: Shielded cable 4: Multi-core cable 10, 20: Insulated wire 11: Center conductor (first center conductor) 12: Insulating layer (first insulating layer) 13: Solid layer (first solid layer) 14: Foam layer (first foam layer) 15: Solid layer (third solid layer) 21: Center conductor (second center conductor) 22: Insulating layer (second insulating layer) 23: Solid layer (second solid layer) 24: Foam layer (second foam layer) 25: Solid layer (fourth solid layer) 30: Insulating layer (third insulating layer) 60: Insulating layer (fourth insulating layer) 70: Insulating layer 40, 83: Shield layer 41: Resin tape 42: Metal foil 43: Plating layer 50: Drain wire 51: Face 71: 1st layer 72:Second layer 73:Ear part 81: Intervention 82: Laminated tape 84:Outer cover 90: Circuit board 91: Conductive layer (first conductive layer) 92: Conductive layer (second conductive layer) 93: Conductor layer (third conductor layer) 95: Insulating substrate 96: Resin

Claims

1. A first insulated wire including a first central conductor and a first insulating layer provided around the first central conductor; a second insulated wire including a second central conductor and a second insulating layer provided around the second central conductor, the second insulated wire being arranged in parallel to the first insulated wire; a third insulating layer provided around the first insulated wire and the second insulated wire; a shield layer provided around the third insulating layer; a drain wire in contact with the shield layer; a fourth insulating layer provided around the shield layer and the drain wire; having the first insulating layer has a first foam layer provided around the first central conductor, the second insulating layer has a second foam layer provided around the second central conductor, The distance between the first central conductor and the second central conductor is the distance between the first central conductor and the shield layer is greater than or equal to 1.6 times the distance, A shielded cable having a distance greater than the distance between the second central conductor and the shielding layer but not greater than 1.6 times the distance.

2. The shielded cable according to claim 1 , wherein the drain wire has a flat plate shape.

3. the first insulating layer has a first solid layer provided around the first central conductor, 3. The shielded cable according to claim 1, wherein the second insulating layer comprises a second solid layer provided around the second central conductor.

4. The first foam layer is provided around the first solid layer, The shielded cable according to claim 3 , wherein the second foam layer is provided around the second solid layer.

5. the first insulating layer has a third solid layer provided around the first foam layer, 5. The shielded cable according to claim 4, wherein the second insulating layer has a fourth solid layer provided around the second foam layer.

6. 6. The shielded cable according to claim 5, wherein the third insulating layer is thicker than the first solid layer, the second solid layer, the third solid layer and the fourth solid layer.

7. The shielded cable according to claim 1 , wherein the shield layer has a plating layer formed on an outer peripheral surface of the third insulating layer.

8. The shielded cable according to claim 1 , wherein the shield layer has a metal foil with which the drain wire is in contact.

9. The shielded cable according to claim 8 , wherein the drain wire is provided between the metal foil and the fourth insulating layer.

10. The shielded cable according to claim 8 , wherein the drain wire is provided between the third insulating layer and the metal foil.

11. 11. The shielded cable according to claim 1, wherein a width of the drain wire is equal to or smaller than a distance between the first central conductor and the second central conductor.

12. The shield layer is attached longitudinally around the third insulating layer, 12. A shielded cable as described in any one of claims 1 to 11, wherein when viewed from a direction perpendicular to the longitudinal direction, an inner end and an outer end of the shielding layer are positioned away from the drain wire in the circumferential direction of the third insulating layer.

13. A first insulated wire including a first central conductor and a first insulating layer provided around the first central conductor; a second insulated wire including a second central conductor and a second insulating layer provided around the second central conductor, the second insulated wire being arranged in parallel to the first insulated wire; a third insulating layer provided around the first insulated wire and the second insulated wire; a shield layer provided around the third insulating layer; a drain wire in contact with the shield layer; a fourth insulating layer provided around the shield layer and the drain wire; having The distance between the first central conductor and the second central conductor is 1.6 times or less of the distance between the first central conductor and the shield layer, The distance between the second central conductor and the shield layer is 1.6 times or less, The drain wire has a flat plate shape, The first insulating layer is a first solid layer provided around the first central conductor; a first foamed layer provided around the first solid layer; a third solid layer provided around the first foamed layer; having The second insulating layer is a second solid layer provided around the second central conductor; a second foamed layer provided around the second solid layer; a fourth solid layer provided around the second foamed layer; having The shielding layer is a shielded cable having a plating layer formed on the outer peripheral surface of the third insulating layer.

14. A shielded cable as described in claim 13, wherein the third insulating layer is thicker than the first solid layer, the second solid layer, the third solid layer and the fourth solid layer.

15. A shielded cable as described in claim 13 or claim 14, wherein the width of the drain wire is less than or equal to the distance between the first center conductor and the second center conductor.

16. A shielded cable according to any one of claims 1 to 15; A substrate connected to the shielded cable; having The substrate is An insulating substrate; a first conductor layer electrically connected to the first central conductor; a second conductor layer electrically connected to the second central conductor; a third conductor layer electrically connected to the drain line; Equipped with the first conductor layer, the second conductor layer, and the third conductor layer are provided on a surface of the insulating base material, the first conductor layer, the second conductor layer, and the third conductor layer extend parallel to each other; The third conductor layer is disposed between the first conductor layer and the second conductor layer.

17. A shielded cable according to any one of claims 1 to 15; A substrate connected to the shielded cable; having The substrate is An insulating substrate; a first conductor layer electrically connected to the first central conductor; a second conductor layer electrically connected to the second central conductor; a third conductor layer electrically connected to the drain line; Equipped with the first conductor layer, the second conductor layer, and the third conductor layer are provided on a surface of the insulating base material, the insulating base material is in contact with a portion of the fourth insulating layer on an opposite side to the first central conductor and the second central conductor with respect to the drain wire, The first conductor layer and the second conductor layer extend parallel to each other, The third conductor layer is a substrate-attached shielded cable that extends in a direction perpendicular to the direction in which the first conductor layer extends.

18. A plurality of shielded cables according to any one of claims 1 to 15; an outer sheath enclosing the plurality of shielded cables; A multi-core cable having

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