Differential signal cable capable of inhibiting oxidation of copper foil surface

Abstract

The utility model discloses a differential signal cable capable of inhibiting copper foil surface oxidation, which comprises two inner conductors arranged side by side at an interval, the two inner conductors are jointly wrapped in a PFA inner insulating layer, and the PFA inner insulating layer is provided with a connecting rib on an interval section between the two inner conductors. The outer part of the PFA inner insulating layer is sequentially coated with a PVDF outer insulating layer, a copper foil layer, a copper-zinc alloy electroplated layer and a foaming PFA sheath layer, the outer surface of the copper foil layer is electroplated to form the copper-zinc alloy electroplated layer, the thickness of the copper-zinc alloy electroplated layer is not greater than 1 [mu] m and is not greater than half of the thickness of the copper foil layer, and the thickness of the PVDF outer insulating layer is 0.2-2mm. According to the differential signal cable, the structure of the shielding layer is optimized, so that the surface oxidation of the copper foil is inhibited, the copper foil layer is not in contact friction with the outer sheath, the copper foil layer is prevented from cracking, the bending resistance is improved, and the durability is good.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, in particular to a differential signal cable capable of suppressing surface oxidation of copper foil. Background Art

[0002] The signal conductors of differential signal shielded cables are usually arranged in pairs to transmit differential signals. General differential signal cables usually use foamed resin insulation layers, such as foamed polyethylene, foamed fluororesin insulation layers, etc. The heat conduction caused by the heating of the conductors can easily cause the insulation layer to deform and deteriorate, and the insulation performance deteriorates. In addition, the copper foil shielding layer of the cable is prone to oxidation and surface discoloration, and the copper foil layer is more likely to crack when bent, resulting in unstable transmission characteristics and poor durability. Summary of the invention

[0003] The utility model aims to solve the technical problem of providing a differential signal cable capable of inhibiting surface oxidation of copper foil, optimizing the shielding layer structure, which is beneficial to inhibiting surface oxidation of copper foil, preventing contact and friction between the copper foil layer and the outer sheath, preventing cracking of the copper foil layer, improving bending resistance and improving durability.

[0004] The utility model solves the above technical problems through the following technical solutions.

[0005] A differential signal cable for inhibiting copper foil surface oxidation comprises two inner conductors arranged side by side and coated together in a PFA inner insulating layer, wherein the PFA inner insulating layer is provided with connecting ribs on the interval between the two inner conductors, and the outside of the PFA inner insulating layer is sequentially coated with a PVDF outer insulating layer, a copper foil layer, a copper-zinc alloy electroplating layer and a foamed PFA sheath layer, the outer surface of the copper foil layer is electroplated to form the copper-zinc alloy electroplating layer, the thickness of the copper-zinc alloy electroplating layer is not greater than 1 μm and not greater than one-half of the thickness of the copper foil layer, and the thickness of the PVDF outer insulating layer is 0.2 mm to 2 mm.

[0006] Preferably, the inner conductor is composed of a plurality of tinned copper monofilaments with a wire diameter of 0.01 mm to 0.02 mm.

[0007] Preferably, the inner conductor lay length is 5 to 12 times the outer diameter of the inner conductor.

[0008] Preferably, the thickness of the PFA inner insulation layer is not less than 0.1 mm.

[0009] Preferably, the copper foil layer is formed by electroplating on the outer surface of the PVDF outer insulation layer.

[0010] Preferably, the width of the connecting rib is not less than one fifth of the diameter of the inner conductor, and the thickness of the connecting rib is not less than twice the thickness of the PFA inner insulating layer.

[0011] Preferably, the copper-zinc alloy electroplating layer has a thickness of 30 nm to 200 nm.

[0012] Preferably, the copper foil layer has a thickness of 3 μm to 20 μm.

[0013] Preferably, the foamed PFA sheath layer has a thickness of 0.3 mm to 0.45 mm.

[0014] The beneficial effects of the utility model are as follows:

[0015] 1. By optimizing the shielding layer structure, a copper-zinc alloy electroplating layer is formed on the outer surface of the original copper foil layer, and the thickness is optimized to be no more than 1μm and no more than half of the thickness of the copper foil layer. It has sufficient corrosion resistance, is beneficial to protect the copper foil layer, inhibits oxidation of the copper foil layer, eliminates discoloration and other degradation caused by oxidation, and the copper foil layer does not contact and rub with the outer sheath, improves the bending resistance, helps prevent cracking of the copper foil layer, ensures stable and reliable shielding performance, and has better durability.

[0016] 2. By wrapping two inner conductors arranged side by side in a non-foamed PFA insulation layer, connecting ribs are formed between the conductors, which effectively maintains the spacing between the conductors and is not easy to deform. The non-foamed PFA insulation layer has better mechanical strength than the foamed PFA insulation layer, and is not prone to deformation, cracking and other premature deterioration during bending and conductor heating, ensuring stable electrical properties of the cable and better durability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 It is a schematic cross-sectional structure diagram of an embodiment of the utility model.

[0019] In the figure: 1-inner conductor, 2-PFA inner insulation layer, 3-connecting ribs, 4-PVDF outer insulation layer, 5-copper foil layer, 6-copper-zinc alloy electroplating layer, 7-foamed FEP sheath layer. DETAILED DESCRIPTION

[0020] In order to more clearly illustrate the utility model, the utility model is further described below in conjunction with preferred embodiments and drawings. Similar components in the drawings are represented by the same reference numerals. Those skilled in the art should understand that the content described below is illustrative rather than restrictive, and should not be used to limit the scope of protection of the utility model.

[0021] See also Figure 1 The differential signal cable for inhibiting copper foil surface oxidation of the embodiment of the utility model comprises two inner conductors 1 arranged side by side and coated together in a PFA inner insulation layer 2. Furthermore, the thickness of the PFA inner insulation layer 2 is not less than 0.1 mm. Specifically, the inner conductor 1 is composed of a plurality of tinned copper monofilaments with a wire diameter of 0.01 mm to 0.02 mm, and the twist length of the inner conductor 1 is 5 to 12 times the outer diameter of the inner conductor 1. The PFA inner insulation layer 2 is formed with a connecting rib 3 on the interval between the two inner conductors 1. Furthermore, the width of the connecting rib 3 is not less than one-fifth of the diameter of the inner conductor 1, and the thickness of the connecting rib 3 is not less than twice the thickness of the PFA inner insulation layer 2.

[0022] The PFA inner insulation layer 2 is coated with a PVDF outer insulation layer 4, a copper foil layer 5, a copper-zinc alloy electroplating layer 6 and a foamed PFA sheath layer 7 in sequence. The PVDF outer insulation layer 4 has a thickness of 0.2 mm to 2 mm. Furthermore, the outer surface of the PVDF outer insulation layer 4 is electroplated to form the copper foil layer 5, and the outer surface of the copper foil layer 5 is electroplated to form the copper-zinc alloy electroplating layer 6. The thickness of the copper-zinc alloy electroplating layer 6 is not greater than 1 μm and does not exceed one-half of the thickness of the copper foil layer 5. Preferably, the copper foil layer 5 has a thickness of 3 μm to 20 μm, and the copper-zinc alloy electroplating layer 6 has a thickness of 30 nm to 200 nm. The foamed PFA sheath layer 7 has a thickness of 0.3 mm to 0.45 mm.

[0023] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not limitations on the implementation methods of the present invention. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is impossible to list all the implementation methods here. All obvious changes or modifications derived from the technical solution of the present invention are still within the scope of protection of the present invention.

Claims

1. A differential signal cable that inhibits copper foil surface oxidation, characterized by: The invention comprises two inner conductors (1) arranged side by side and spaced apart and coated together in a PFA inner insulating layer (2); the PFA inner insulating layer (2) is provided with a connecting rib (3) on the interval section between the two inner conductors (1); the outer portion of the PFA inner insulating layer (2) is coated with a PVDF outer insulating layer (4), a copper foil layer (5), a copper-zinc alloy electroplated layer (6) and a foamed PFA sheath layer (7) in sequence; the outer surface of the copper foil layer (5) is electroplated to form the copper-zinc alloy electroplated layer (6); the thickness of the copper-zinc alloy electroplated layer (6) is not greater than 1 μm and does not exceed one half of the thickness of the copper foil layer (5); the thickness of the PVDF outer insulating layer (4) is 0.2 mm to 2 mm.

2. The copper foil surface oxidation inhibiting differential signal cable according to claim 1, characterized in that: The inner conductor (1) is composed of a plurality of tinned copper monofilaments with a wire diameter of 0.01 mm to 0.02 mm twisted together.

3. The copper foil surface oxidation inhibiting differential signal cable according to claim 2, characterized in that: The lay length of the inner conductor (1) is 5 to 12 times the outer diameter of the inner conductor (1).

4. The copper foil surface oxidation inhibiting differential signal cable according to claim 1, characterized in that: The thickness of the PFA inner insulating layer (2) is not less than 0.1 mm.

5. The differential signal cable for inhibiting copper foil surface oxidation according to claim 1, characterized in that: The copper foil layer (5) is formed by electroplating the outer surface of the PVDF outer insulating layer (4).

6. The copper foil surface oxidation inhibiting differential signal cable according to claim 1, characterized in that: The width of the connecting rib (3) is not less than one fifth of the diameter of the inner conductor (1), and the thickness of the connecting rib (3) is not less than twice the thickness of the PFA inner insulating layer (2).

7. The copper foil surface oxidation inhibiting differential signal cable according to claim 1, characterized in that: The copper-zinc alloy electroplating layer (6) has a thickness of 30 nm to 200 nm.

8. The copper foil surface oxidation inhibiting differential signal cable according to claim 1, characterized in that: The copper foil layer (5) has a thickness of 3 μm to 20 μm.

9. The copper foil surface oxidation inhibiting differential signal cable according to claim 1, characterized in that: The thickness of the foamed PFA sheath layer (7) is 0.3 mm to 0.45 mm.

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