Cable

Abstract

The invention discloses a cable which comprises a core wire, a shielding tape wrapping the core wire and an outer insulating layer wrapping the shielding tape, the shielding tape longitudinally wraps the core wire and comprises a shielding layer and an adhesive layer located on the outer surface of the shielding layer, and the adhesive layer is only arranged on the overlapped portion when the shielding tape wraps the core wire. The electrical property of the cable is good.

Description

[Technical field]

[0001] The present invention relates to a cable, and in particular 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 are widely used as a tool for transmitting signals in home appliances, instruments, automation equipment, data centers, servers, switches, data centers, cloud computing, 5G and other fields. However, during the signal transmission process, cables are extremely susceptible to interference from external electromagnetic signals, so it is often necessary to set the shielding layer outside the core wire of the cable to eliminate or reduce the interference of external electromagnetic fields. In traditional designs, a layer of glue is set on the surface of the shielding layer to bond the shielding layer to the cable. However, the presence of glue increases the loss factor of the cable and increases the attenuation, thereby affecting the electrical performance of the cable.

[0003] See also Figure 1 , which is a conventional shielding tape 200 used in traditional high-speed signal lines. The shielding tape 200 includes a metal layer 201, an insulating layer 202, and an intermediate glue layer 203 connecting the metal layer 201 and the insulating layer 202 together. Hot melt glue 204 is provided on the entire surface of the insulating layer 202. When the shielding tape 200 is wrapped around the cable, the overall attenuation value of the cable is large due to the high loss factor of the hot melt glue 204.

[0004] Therefore, it is necessary to provide a cable with good electrical performance. [Summary of the invention]

[0005] The main purpose of the present invention is to provide a cable with good electrical performance and a stable structure.

[0006] To achieve the above-mentioned purpose, the present invention can adopt the following technical scheme: a cable, which includes a core wire, a shielding tape covering the core wire and an outer insulating layer covering the shielding tape, the shielding tape longitudinally covering the outside of the core wire, the shielding tape including a shielding layer and a rubber layer located on the outer surface of the shielding layer, and the rubber layer is only arranged on the overlapping part when the shielding tape covers the core wire.

[0007] Compared with the prior art, the present invention has the following beneficial effects: the adhesive layer of the shielding tape of the cable of the present invention is only arranged on the overlapping part when the shielding tape covers the core wire, and the adhesive layer is not arranged on the other part of the shielding tape, so that the electrical performance of the cable is better and the shielding tape has a stable structure on the cable.

Brief Description of the Drawings

[0008] Figure 1 It is a conventional shielding tape used in traditional high-speed signal lines.

[0009] Figure 2It is a cross-sectional view of a cable according to the present invention.

[0010] Figure 3 is a side view of the shielding tape of the present invention.

[0011] Figure 4 It is a performance curve diagram of cables using the shielding tape of the present invention and using a conventional shielding tape.

[0012]

Main component symbol description

[0013] Cable 100 Core 10

[0014] Inner conductor 11 Inner insulating layer 12

[0015] Shielding tape 30 Shielding layer 31

[0016] Adhesive layer 32 Metal layer 311

[0017] Insulation layer 312 Intermediate rubber layer 313 [Specific implementation method]

[0018] See also Figure 2 1 is a cable 100 according to the present invention. The cable 100 comprises a core wire 10, a shielding tape 30 covering the core wire 10, and an outer insulating layer (not shown) covering the shielding tape 30.

[0019] The core wires 10 include a pair, and the pair of core wires 10 are arranged in contact with each other. Each core wire 10 includes an inner conductor 11 and an inner insulating layer 12 covering the inner conductor 11. The inner conductor 11 is used to transmit high-speed signals. The shielding tape 30 is longitudinally covered outside the pair of core wires 10, and the shielding tape 30 includes a shielding layer 31 and a glue layer 32 located on the surface of the shielding layer 31. The shielding layer 31 includes a metal layer 311, an insulating layer 312, and an intermediate glue layer 313 that combines the metal layer 311 and the insulating layer 312. The material of the metal layer 311 can be a conductive metal such as metal aluminum, metal copper or metal silver. The material of the insulating layer 312 includes any one of PET (Chinese full name: tetrafluoroethylene-hexachloropropylene copolymer), PP (Chinese full name: polypropylene) or FTFE (Chinese full name: polytetrafluoroethylene). The intermediate glue layer 313 is a composite glue. In other embodiments, the shielding layer 31 may also only include the metal layer 311 and the insulating layer 312 , without the intermediate rubber layer 313 , and the metal layer 311 is directly rolled on the insulating layer 312 .

[0020] See also Figure 3 The adhesive layer 32 is only provided at the overlapping portion when the shielding tape 30 covers the core wire 10. The two ends of the shielding tape 30 are bonded by the adhesive layer 32 so that the shielding tape 30 is stably fixed to form a stable connection.

[0021] The adhesive layer 32 may be provided on only one surface of the shielding layer 31, or may be provided on both surfaces of the shielding layer 31. Specifically, in the present invention, the adhesive layer 32 is provided on both surfaces of the shielding tape 30. When the shielding tape 30 is wrapped around a pair of the core wires 10, the adhesive layers 32 on the two surfaces overlap each other. The thickness of the adhesive layer 32 is between 0.001 mm and 0.006 mm. Specifically, in the present invention, the thickness of the adhesive layer 32 is 0.003 mm. The area of ​​the shielding layer 31 covered with the adhesive layer 32 accounts for 25% to 30% of the entire surface area of ​​the shielding layer 31.

[0022] See also Figure 4 , which is a SDD21 (Chinese: differential insertion loss) curve of the cable 100 using the shielding tape 30 of the present invention and the SDD21 curve of the cable using the traditional shielding tape. The test samples are the same except for the shielding tape. Specifically, the shielding tape is used. Figure 2 The structure is a cable 100 of American Wire Gauge No. 30 (30AWG). The horizontal axis is the frequency, in GHz, and the vertical axis is the loss, in dB. Curve 1 is a SDD21 curve graph using the shielding tape 30 of the present invention, and curve 2 is a SDD21 curve graph using the shielding tape 30 of the present invention. Figure 1 From the SDD21 curve of the traditional shielding tape, it can be seen that as the frequency increases, the differential insertion loss of the cable 100 using the shielding tape 30 of the present invention is significantly smaller than the differential insertion loss of the cable using the traditional shielding tape.

[0023] The hot melt glue of the cable of the present invention does not cover the entire shielding layer 31, but is only applied to partial areas, so that after the cable 100 is covered with the shielding tape 30, only the overlapping part has glue, and other places have no glue, which will not cause the insulation loss factor to increase, thereby making the overall attenuation value of the cable 100 smaller and the loss lower. At the same time, the cable 100 using the shielding tape 30 of the present invention has a simple and stable structure, and the cost of the cable 100 will not increase, which has obvious advantages and is more competitive in the market.

Claims

1. A cable, comprising a core wire, a shielding tape covering the core wire, and an outer insulating layer covering the shielding tape, wherein the shielding tape is longitudinally covered outside the core wire, and the shielding tape comprises a shielding layer and a rubber layer located on the outer surface of the shielding layer, characterized in that: The adhesive layer is only arranged on the overlapping portion when the shielding tape covers the core wire.

2. The cable according to claim 1, characterized in that: The adhesive layer is only arranged on one surface of the shielding layer.

3. The cable according to claim 1, characterized in that: Adhesive layers are arranged on both surfaces of the shielding layer.

4. The cable according to claim 2, characterized in that: The thickness of the adhesive layer is between 0.001 mm and 0.006 mm.

5. The cable according to claim 4, characterized in that: The thickness of the adhesive layer is 0.003 mm.

6. The cable according to claim 2, characterized in that: The surface area of ​​the adhesive layer accounts for 25% to 30% of the surface area of ​​the outer surface of the shielding layer.

7. The cable according to claim 2, characterized in that: The core wires include a pair, the pair of core wires are in contact with each other and are arranged in parallel, and each of the core wires includes an inner conductor and an inner insulating layer covering the inner conductor.

8. The cable according to claim 2, characterized in that: The shielding layer includes a metal layer, an insulating layer and an intermediate glue layer which combines the metal layer and the insulating layer together.

9. The cable according to claim 8, characterized in that: The material of the metal layer includes any one of metal aluminum, metal copper and metal silver.

10. The cable according to claim 8, characterized in that: The insulating layer material includes any one of PET, PP and FTFE.

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