CN207611621U - A kind of LVDS cable - Google Patents

Abstract

The utility model discloses a kind of LVDS cables.Including core, obturator, drain wire, and the core, obturator, drain wire are wrapped in interior shielded layer together, the outer surface of the shielded layer is enclosed with buffer layer and restrictive coating successively.Using the collective effect of drain wire and shielded layer, make core from external interference, significantly more efficient reduction wired signal transmission attenuation rate, while buffer layer, the significantly more efficient service life and effect that ensure that shielded layer are externally provided with equipped with shielded layer；It is wrapped that polyimides progress is used again, and cable is enable to be used in the environment of higher temperature.

Description

A kind of LVDS cable

Technical field

The utility model is related to technical field of electric wires and cables, more particularly to a kind of LVDS cable.

Background technology

Currently, aircraft with high-end field differential signal with the greatest problem that transmission cable faces is exactly to believe in world wide The problem of stability of number transmission, the anti-interference problem of cable is always field further investigation.This kind of cable on domestic market Anti-interference problem still largely exist, so being badly in need of a kind of anti-interference strong, stable signal transmission cable.

It is specially the outer of high intensity silver-plated copper alloy stranded wire conductor that Chinese patent CN202034090U, which discloses a kind of cable, Layer is perfluoroethylene-propylene insulating layer, perfluoroethylene-propylene insulating layer and the filling being twisted using expanded PTFE micropore band Core twists together, and perfluoroethylene-propylene insulating layer outer layer is expanded PTFE micropore band wrapping layer, expanded PTFE micropore band around It is silver-gilt copper wire woven shield between covering and perfluoroethylene-propylene sheath.The interference free performance of the cable is poor, can not shield Larger interference.

Invention content

The utility model aim is to provide a kind of LVDS cable, has stronger anti-interference, stable signal transmission.

The utility model solve its technical problem the technical solution adopted is that, propose a kind of LVDS cable,

Including core, obturator, drain wire, and the core, obturator, drain wire are wrapped in interior shielding together Layer, the outer surface of the shielded layer is enclosed with buffer layer and restrictive coating successively.

Further, the core is externally provided with insulation wrapping layer.

Further, the material of the insulation wrapping layer is polyimide composite film.

Further, the outer diameter ratio of the conductor insulation wrapping layer is 1:2~1:3.

Further, the conductor and drain wire are stranded copper alloy.

Further, the filler is polyphenyl type PI fibers.

Further, the shielded layer is reticular structure made of silver-gilt copper wire braiding.

Further, the buffer layer is polytetrafluoroethylene film.

Further, the restrictive coating forms for polyimide composite film is wrapped.

The utility model uses the collective effect of drain wire and shielded layer, makes core from external interference, significantly more efficient Wired signal transmission attenuation rate is reduced, while buffer layer is externally provided with equipped with shielded layer, it is significantly more efficient to ensure that making for shielded layer With service life and effect；It is wrapped that polyimides progress is used again, and cable is enable to be used in the environment of higher temperature.

Description of the drawings

Fig. 1 is a kind of LVDS cable structural schematic diagram of the utility model.

In figure：1- cores, 2- obturators, 3- drain wires, 4- shielded layers, 5- buffer layers, 6- restrictive coatings, 7- insulation are wrapped Layer.

Specific implementation mode

It, below will control in order to illustrate more clearly of the utility model embodiment and/or technical solution in the prior art Illustrate specific embodiment of the present utility model.It should be evident that the accompanying drawings in the following description is only the utility model Some embodiments for those of ordinary skill in the art without creative efforts, can also basis These attached drawings obtain other attached drawings, and obtain other embodiments.In addition, between being related to the belonging to and only indicate each component of orientation Relative position relation, rather than absolute positional relation.

It please refers to Fig.1.The LVDS cable of the utility model, including core 1, obturator 2, drain wire 3, and by core 1, Obturator 2, drain wire 3 are wrapped in interior shielded layer 4 together, and the outer surface of shielded layer 4 is enclosed with buffer layer 5 and restrictive coating successively 6。

Drain wire 3 act as avoiding thunder and lightning directly to hit cable, in general, such as hits the direct attack thunder and lightning of drain wire 3 Stream peak value is not higher than 15KA, hardly happens counterattack to cable, with the lightning current of the flowing on drain wire 3, is produced on cable It has given birth to from the direct aerial drainage of lightning strike spot to the opposite induced current in the lightning current direction of cable, electric current total on cable is made significantly to subtract It is small, to reduce the overvoltage on cable core between protective metal shell；Even if the soil between drain wire 3 and cable is breakdown And to cable discharge, drain wire 3 can reduce broken by lightning degree, and reduce the lightning current for flowing into cable；It can mitigate simultaneously Be struck by lightning the energy that fuel factor and mechanical effect generate on cable.

Especially in precision or the higher field of precise requirements, drain wire 3 is not only able to prevent core 1 from receiving To interference, while the effect of null offset is prevented to a certain extent, ensure that the accurate transmission of the data such as instrument, instrument.

Core 1 is externally provided with insulation wrapping layer 7, can not only play the role of insulation, while also taking into account the work of protection core 1 With preventing from being rubbed with shielded layer 4 using core 1 for a long time is damaged.The material of the insulation wrapping layer 7 is that polyimides is compound Film.The reason of using polyimides as insulation around packaging material is polyimides refers to containing imide ring-CO-NH- on main chain A kind of polymer of CO-, wherein mostly important with the polymer containing phthalimide structure.Polyimides is as a kind of extraordinary work Journey material has been widely used in fields such as Aeronautics and Astronautics, microelectronics, nanometer, liquid crystal, seperation film, laser.

Polyimides is best one of the high-molecular organic material of comprehensive performance, and high temperature resistant makes for a long time up to 400 DEG C or more With temperature range -200~300 DEG C, no sharp melting point, high insulating property, 103 hertz of lower dielectric constants 4.0, dielectric loss is only 0.004~0.007.Dielectric loss is smaller, and better, insulation performance is also better for the quality of insulating materials.If dielectric loss is excessive, Dielectric temperature will rise so high, this will accelerate dielectric thermal decomposition and aging, eventually lead to losing completely for insulation performance.

The outer diameter ratio of the insulation wrapping layer 7 of core 1 is 1:2~1:3.The ratio is mainly used for meeting the resistance of product nominal characteristic Anti- 100 Ω.In the range, the insulation of core 1 wrapping layer 7 can keep out good insulating properties, while can also keep higher Mechanicalness makes cable possess stronger application space in practical applications.

Core 1 and drain wire 3 are stranded copper alloy.It is closed with the high-strength copper of 19 diameter 0.102mm in the present embodiment Core 1 and drain wire 3 made of golden conductor strand not only possess very strong conductivity, while the tensile strength of core 1 is common The 2 times or more of silver-coated copper wire is higher level in signal transmission and cable machinery performance.

Obturator 2 is polyphenyl type PI fibers.Because the cable core 1 of cable is twisted by more and is formed, in cabling process Gap is necessarily will produce, if these gaps are closely knit without material filling, the cable core 1 of cable quietly, does not reduce cable and exists In service life during use, in cable squeeze jacket, cable jacket material will necessarily be embedded among cable core 1, lead to cable cost Rising.The characteristic of polyphenyl type PI fibers is high temperature resistant and low-k, can reduce product complex dielectric constant, improves transmission Rate.

Shielded layer 4 is reticular structure made of silver-gilt copper wire braiding.Cable core 1 is twisted by stranded conductor, it Air gap is easily formed between insulating layer, conductive surface is rough, electric field can be caused to concentrate.In conductive surface plus one layer of semiconductive material The shielded layer 4 of material, it is well contacted with insulating layer with shielded conductor equipotential, to avoid in conductor and insulating layer Between shelf depreciation occurs.

Buffer layer 5 is polytetrafluoroethylene film.The effect of buffer layer 5 is that shielded layer 4 is preferably made to be bonded with restrictive coating 6, Because shielded layer 4 is reticular structure made of tinsel braiding, abrasion can be generated to restrictive coating 6 in the long-term use, Service life and the safety of cable greatly reduces.Polytetrafluoroethylene (PTFE) not only has high temperature resistant, corrosion-resistant, weatherability spy Point makes cable reach the service life of long period；Also there is good mechanical tenacity and electrical insulating property, in use, It can preferably ensure practicability and the safety of cable.

Restrictive coating 6, which is that polyimide composite film is wrapped, to be formed.Due to the higher temperature tolerance of polyimides, in 300 DEG C not It decomposes variation, no sharp melting point, electric performance stablity uses to ensure that product has in 300 DEG C of even 400 DEG C of occasions Reliability.

It, cannot the above content is specific preferred embodiment further detailed description of the utility model is combined Assert that the specific implementation of the utility model is confined to these explanations.For the ordinary skill of the utility model technical field For personnel, without departing from the concept of the premise utility, a number of simple deductions or replacements can also be made, should all regard To belong to the scope of protection of the utility model.

Claims (9)

1. a kind of LVDS cable, it is characterised in that：Including core（1）, obturator（2）, drain wire（3）, and by the core （1）, obturator（2）, drain wire（3）It is wrapped in interior shielded layer together（4）, the shielded layer（4）Outer surface wrap up successively There is buffer layer（5）And restrictive coating（6）.

2. a kind of LVDS cable as described in claim 1, it is characterised in that：The core（1）It is externally provided with insulation wrapping layer （7）.

3. a kind of LVDS cable as claimed in claim 2, it is characterised in that：The insulation wrapping layer（7）Material be polyamides Imines composite membrane.

4. a kind of LVDS cable as claimed in claim 2, it is characterised in that：The core（1）Insulate wrapping layer（7）Outer diameter Ratio is 1:2~1:3.

5. a kind of LVDS cable as described in claim 1, it is characterised in that：The core（1）And drain wire（3）It is twisted Copper alloy.

6. a kind of LVDS cable as described in claim 1, it is characterised in that：The obturator（2）For polyphenyl type PI fibers.

7. a kind of LVDS cable as described in claim 1, it is characterised in that：The shielded layer（4）For silver-gilt copper wire braiding At reticular structure.

8. a kind of LVDS cable as described in claim 1, it is characterised in that：The buffer layer（5）For polytetrafluoroethylene film.

9. a kind of LVDS cable as described in claim 1, it is characterised in that：The restrictive coating（6）For polyimide composite film It is wrapped to form.