Signal line unit, preparation method thereof and VGA cable

Abstract

The present invention relates to a signal line unit comprising a signal line conductor and an insulator layer covering the outer periphery of the signal line conductor, the insulator layer comprising a first insulating layer and a second insulating layer, the first insulating layer being provided between the signal line conductor and the second insulating layer, the second insulating layer being provided between the signal line conductor and the second insulating layer; the diameter of the signal line conductor is a, the thickness of the first insulating layer is b, the thickness of the second insulating layer is c, and the following conditions are satisfied: (b + c) is more than or equal to 8a and less than or equal to 14a, and b: c = 0.6-1: 1. The invention also relates to a method for preparing the signal line unit. The invention also relates to a VGA (Video Graphics Array) cable which is provided with one or more signal line units.

Description

technical field [0001] The present invention relates to the technical field of communication cables, in particular to a signal line unit, a preparation method of the signal line unit, and a VGA cable using the signal line unit. Background technique [0002] The VGA (Video Graphics Array) interface is used to input / output analog signals, and the VGA cable is used to connect between two VGA interfaces. on the monitor. The vertical section of the existing VGA cable is as follows: figure 1 As shown, the outside of the VGA cable is provided with an outer jacket layer 8, the outer jacket layer 8 is provided with a braided layer 7, and the braided layer 7 is covered with a shielding aluminum foil 6. The shielding aluminum foil 6 can effectively shield interference signals, and the interior of the shielding aluminum foil 6 is set There are multiple signal line units 3 (corresponding to the attached figure 1 A1-A3 in), multiple control line units 4 (corresponding to the attached ...

AI Technical Summary

Problems solved by technology

[0004] 1. The polyethylene material is easy to fluid deformation due to external pressure due to its good fluidity and high softness for a period of time after high-temperature extrusion molding, which leads to a decrease in the insulation concentricity of the signal line unit, which in turn affects the VGA cable. Electrical performance;

[0005] 2. The temperature resistance of polyethylene material is poor, so in order to improve the temperature resistance of the insulator layer until the temperature resistance level of the VGA cable is not lower than 105°C (that is, to meet the vehicle requirements), it is necessary to mix and add polyethylene materials Adding additives to improve the temperature resistance of polyethylene materials, but adding additives to polyethylene materials will easily lead to insufficient connection adhesion between the insulator layer and the signal line conductor, resulting in the signal line unit being subjected to torsion during the cable forming process. There are serious defects in the separation of the insulator layer and the signal line conductor, which affect the cutting process and electrical performance of the VGA cable, and easily cause safety hazards;

[0006] 3. The insulator layer prepared by polyethylene material is subjected to irradiation cross-linking process (that is, high-energy or ionizing radiation is used to induce ionization and excitation of polyethylene material, and the obtained molecular free radicals undergo free radical reactions to produce secondary reactions to cause chemical changes. Forming a cross-linked network between molecules) will improve the temperature resistance of polyethylene materials, but the stress between the insulator layer and the signal line conductor will be caused by the irradiation cross-linking process including the process of passing the guide wheel, secondary traction, and winding. Increase, which in turn will easily lead to a gap between the insulator layer and the signal line conductor;

[0007] 4. The insulation effect of the insulator layer made of polyethylene material is positively correlated with the thickness of the insulator layer, so the thickness of the insulator layer needs to be increased to meet the requirements for the insulation performance of the signal line unit, but if the thickness of the insulator layer is increased, it is easy to cause the polyethylene material to Severe fluid deformation occurs during the high-temperature extrusion molding process, which causes the overall signal line unit to deform, which in turn makes the impedance of the VGA cable fail to meet the requirements

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