Cables

Abstract

The utility model discloses a cable which comprises a pair of core wires, an insulating layer covering the pair of core wires, a shielding layer covering the insulating layer and an outer insulating layer covering the shielding layer, and the shielding layer is a copper-aluminum composite layer. The cable uses the copper-aluminum composite layer as the shielding layer, which not only increases the shielding effect of the cable, but also improves the bending resistance of the cable.

Description

[Technical Field]

[0001] This utility model relates to a cable, and more particularly to a high-speed signal cable for transmitting high-frequency signals. [Background Technology]

[0002] With the development and popularization of electronic technology products, signal cables, as a tool for transmitting signals, are widely used in home appliances, instruments, automation equipment, data centers, servers, switches, cloud computing, and 5G. However, during signal transmission, cables are highly susceptible to interference from external electromagnetic signals. Therefore, shielding structures are often required to eliminate or reduce interference from external electromagnetic fields and prevent signal leakage.

[0003] Therefore, it is necessary to provide a new type of shielded cable with strong anti-interference performance and stable signal transmission. [Utility Model Content]

[0004] The main purpose of this invention is to provide a cable with good shielding effect and stable signal transmission.

[0005] To achieve the above objectives, the present invention can adopt the following technical solution: a cable, comprising a pair of core wires, an insulation layer covering the pair of core wires, a shielding layer covering the insulation layer, and an outer insulation layer covering the shielding layer, wherein the shielding layer is a copper-aluminum composite layer.

[0006] Compared with the prior art, the present invention has the following beneficial effects: the copper-aluminum composite layer, as a shielding layer, not only increases the shielding effect of the cable and ensures the reliability of signal transmission, but also improves the cable's resistance to bending. [Attached Image Description]

[0007] Figure 1 This is a cross-sectional view of the first embodiment of the cable of this utility model.

[0008] Figure 2 This is a cross-sectional view of the first embodiment of the shielding layer of the cable of this utility model.

[0009] Figure 3 This is a cross-sectional view of a second embodiment of the shielding layer of the cable of this utility model.

[0010] Figure 4 This is a cross-sectional view of the second embodiment of the cable of this utility model.

[0011] [Explanation of Key Component Symbols]

[0012] 100' cable, 100' core wires, 10' core wires

[0013] Inner conductor 11 Inner insulation layer 12

[0014] Insulation layer 30, 30'; Shielding layer 50, 50'

[0015] Outer insulation layer 70, ground wire 90

[0016] Air gap 31, intermediate layer 51

[0017] Copper layer 53, 53'; Aluminum layer 55

[0018] Composite adhesive layer 57 Hot melt adhesive layer 59

Detailed Implementation Methods

[0019] Please see Figure 1 The image shows a first embodiment of the cable 100 of this utility model. The cable 100 includes a pair of core wires 10, an insulation layer 30 covering the pair of core wires 10, a shielding layer 50 covering the insulation layer 30, an outer insulation layer 70 covering the shielding layer 50, and a ground wire 90 located between the shielding layer 50 and the outer insulation layer 70.

[0020] The pair of core wires 10 are in contact with each other and extend in the longitudinal direction. Each of the pair of core wires 10 includes an inner conductor 11 and an inner insulation layer 12 extruded and formed outside the inner conductor 11, the inner conductor 11 being used to transmit high-speed signals. The inner insulation layer 12 of each core wire 10 covers its respective inner conductor 11 by extrusion forming. The inner conductor 11 is any one of a silver-plated copper inner conductor, an alloy copper inner conductor, and a graphene copper inner conductor. The inner insulation layer 12 is made of PE (polyethylene) or foamed PE.

[0021] The insulating layer 30 is extruded and molded over the pair of core wires 10. This structure allows the cable 100 to exhibit minimal impedance change when the bending radius is small; for example, when the bending radius is equal to the thickness of the cable 100, the impedance change rate is less than 2 ohms. Air gaps 31 are formed on the upper and lower sides between the insulating layer 30 and the pair of core wires 10. The insulating layer 30 is made of PE or foamed PE.

[0022] There are two ground wires 90. The ground wires 90 are located on the left and right sides of the shielding layer 50, and are roughly arranged on the extension line passing through the center of the two inner conductors 11. The ground wires 90 are made of tin-plated copper or silver-plated copper.

[0023] Please see Figure 2As shown, the shielding layer 50 is a copper-aluminum composite layer. The shielding layer 50 includes an intermediate layer 51, a copper layer 53 disposed on one side of the intermediate layer 51, and an aluminum layer 55 disposed on the other side of the intermediate layer 51. The copper layer 53 faces inward. The intermediate layer 51 is made of PET material. The copper layer 53 and the aluminum layer 55 are manufactured using different processes. The copper layer 53 is manufactured using a calendering process and is bonded to one side of the intermediate layer 51 using a TPU (thermoplastic polyester) composite adhesive layer 57. The aluminum layer 55 is electroplated on the other side of the intermediate layer 51. Thus, the layers of the shielding layer 50 are arranged sequentially as follows: aluminum layer 55, PET intermediate layer 51, TPU composite adhesive layer 57, and copper layer 53. The thickness of the copper layer 53 is greater than the thickness of the aluminum layer 55. Specifically, in this invention, the copper layer 53 is 6 μm thick. The aluminum layer 55 is 1 μm thick. The intermediate layer 51 is 12 μm thick. The shielding layer 50 is wrapped around the insulation layer 30 in a longitudinal wrapping manner or in a spiral winding manner. On the one hand, copper has good conductivity and excellent electrical properties. The copper layer 53 is made by rolling process, which has good density and good shielding performance, thus greatly improving the attenuation performance of the cable 100. If the copper layer 53 is set by electroplating, due to process limitations, the thickness of the plating layer is limited, not exceeding 3μm at most, and the density of the electroplated layer is not good, which will affect the shielding effect. On the other hand, copper is not as ductile as aluminum and is easily damaged during bending. Aluminum has good ductility, which makes it easy to bend the cable 100. Furthermore, electroplating can make the aluminum layer 55 thinner. The combination of the two can further ensure the shielding effect of the cable 100.

[0024] The outer insulation layer 70 is a PI (polyimide) material wrapping tape. PI material meets the VW-1 flame retardant rating requirements. The inner insulation layer 12, insulation layer 30, shielding layer 50, and outer insulation layer 70 of the cable 100 of this utility model are all made of PFAS-free materials, meeting the PFAS-free environmental protection requirements.

[0025] Please refer to Figure 3 To conform to another embodiment of the cable 100 used in this utility model, the shielding layer 50' in this embodiment, compared with the shielding layer 50 in the first embodiment, further includes an EVA (ethylene vinyl acetate copolymer) hot melt adhesive layer 59 disposed on the copper layer 53'. The shielding layer 50' is fixed to the outside of the insulation layer 30 by the EVA hot melt adhesive layer 59. The thickness of the TPU composite adhesive layer 57 is 6µm.

[0026] Please see Figure 4The image shows a second embodiment of the cable 100' of this utility model. Compared with the cable 100 of the first embodiment, this embodiment does not have an air gap 31. The insulation layer 30' is filled between a pair of core wires 10' during extrusion.

[0027] The cable 100 of this invention uses a copper-aluminum composite layer as the shielding layer 50, which not only increases the shielding effect of the cable 100 but also improves its bending resistance. This provides more options for improving the high-frequency characteristics of the cable 100, making it suitable for the current rapid development of high-speed cables.

[0028] However, it is understood that although many features and advantages of the present invention have been mentioned in the foregoing description, including some structural and functional details, this disclosure is merely illustrative and many details are subject to change, particularly in the shape, size and arrangement of components within the scope of the principle as indicated by the broad general meaning of the terms set forth in the appended claims.

Claims

1. A cable comprising a pair of core wires, an insulating layer covering the pair of core wires, a shielding layer covering the insulating layer, and an outer insulating layer covering the shielding layer, characterized by: The shielding layer is a copper-aluminum composite layer, which includes an intermediate layer, a copper layer disposed on one side of the intermediate layer, and an aluminum layer disposed on the other side of the intermediate layer. The copper layer is disposed inward. The shielding layer further includes an EVA hot melt adhesive layer disposed on the copper layer. The shielding layer is fixed to the outside of the insulating layer by the EVA hot melt adhesive layer.

2. The cable of claim 1, wherein: The copper and aluminum layers are manufactured using different processes.

3. The cable of claim 2, wherein: The intermediate layer is made of PET material, the copper layer is made by calendering and is bonded to one side of the intermediate layer with TPU composite adhesive, and the aluminum layer is electroplated on the other side of the intermediate layer.

4. The cable of claim 3, wherein: The thickness of the copper layer is greater than the thickness of the aluminum layer.

5. The cable of claim 3, wherein: The thickness of the copper layer is 6µm, the thickness of the aluminum layer is 1µm, the thickness of the intermediate layer is 12µm, and the thickness of the TPU composite adhesive is 6µm.

6. The cable of claim 1, wherein: Each of the pair of core wires includes an inner conductor and an inner insulation layer extruded and formed outside the inner conductor. The insulation layer is extruded and formed to cover the pair of core wires. The inner conductor is any one of silver-plated copper inner conductor, alloy copper inner conductor, and graphene copper inner conductor. The material of the inner insulation layer is PE or foamed PE.

7. The cable of claim 1, wherein: It further includes at least one ground wire disposed between the shielding layer and the outer insulating layer, the ground wire being made of tin-plated copper or silver-plated copper.

8. The cable of claim 1, wherein: The outer insulation layer is a PI material wrapping tape.

Images