WO2020168671A1

WO2020168671A1 - Data cable and manufacturing method thereof

Info

Publication number: WO2020168671A1
Application number: PCT/CN2019/095216
Authority: WO
Inventors: 李先俊
Original assignee: 济宁市海富电子科技有限公司
Priority date: 2019-02-18
Filing date: 2019-07-09
Publication date: 2020-08-27
Also published as: CN109979673A

Abstract

A data cable and a manufacturing method thereof. The data cable comprises: multiple data transmission lines (1) arranged parallel to one another, the data transmission line comprising a core body (11) made of an electrically-conductive material and an outer sheath layer (12) arranged at the periphery of the core body (11); a protection layer (4) arranged at the periphery of the multiple data transmission lines (1) to enclose the same; and shielding members (3) connected in an overlapping manner and wound around the periphery of the protection layer (4), wherein the shielding member (3) comprises an inner first metal foil layer (31), a middle insulating layer (32) and an outer second metal foil layer (33), and the first metal foil layer (31) of one shielding member (3) partially overlaps with the second metal foil layer (33) of the shielding member (3) adjacent thereto. The above structure can effectively shield external electromagnetic interference, thereby exhibiting favorable electromagnetic shielding performance.

Description

Data cable and manufacturing method thereof

Technical field

The present invention relates to the technical field of cables, and in particular to a data cable and a manufacturing method thereof for improving electromagnetic shielding performance against external electromagnetic interference.

Background technique

With the rapid development of multimedia technology, people have put forward higher and higher requirements for the quality of multimedia transmission, especially the demand for high-definition multimedia. Multimedia that simply transmits video or audio signals can no longer meet the needs of the current society. HDMI cable is the high-definition multimedia interface cable, which is the abbreviation of High Definition Multimedia Interface. It is a digital video/audio interface technology that can transmit uncompressed high-definition video and multi-channel audio data with high quality; at the same time, there is no need to transmit Digital/analog or analog/digital conversion can be carried out before, to ensure the highest quality video and audio signal transmission. The HDMI cable usually includes the data cable shown in Figure 1 as the data cable.

Fig. 1 is a cross-sectional view showing a data cable in the prior art, and Fig. 2 is a schematic diagram showing the winding and overlapping of the inner shield layer in the prior art. As shown in Figures 1 and 2, the data cable in the prior art includes two parallel data transmission lines 1, a grounding wire composed of a metal conductor, and a shielding layer covering the outside of the data transmission line 1 and the grounding wire 2. 3 and a protective layer 4 located outside the shielding layer 3. Wherein, the data transmission line 1 includes a core 11 composed of metal wires and a skin layer 12 covering the outer periphery of the core. After the ground line 2 is arranged near the data transmission line 1 along the length direction of the data transmission line 1, the two data transmission lines 1 and the ground line 2 are wrapped with a shielding layer 3 outside. Then, a protective layer 4 is formed on the outer side of the shielding layer 3 to prevent the shielding layer 3 from opening during bending and twisting.

The shielding layer 3 includes a first metal foil layer 31 on the inner side and an insulating layer 32 on the outer side. The first metal foil layer 31 functions to shield electromagnetic interference from the outside. The shielding layer 3 is spirally wound on the outside of the two data transmission lines 1 and the grounding line 2 in a sequential overlapping manner. As shown in Figure 2, during the process of winding the shielding layer 3, the first metal foil layer 31 is wound on the inside of the cable, and the insulating layer 32 is wound on the outside. One edge of the first metal foil layer 31 is insulated from the previously wound The edge portions of the layer 32 overlap each other, and the other side edge portion of the first metal foil layer 31 is in contact with the ground wire 2. As a result, external electromagnetic interference will be introduced into the cable through the insulating layer 32 between the first metal foil layers 31 after winding, and cause interference to the data signal transmitted in the data transmission line 1. Especially when the data line 1 transmits high-frequency video signals, the influence of external electromagnetic interference will be more obvious.

In addition, in actual use, the tension of the ground wire 2 will cause the two data transmission lines 1 to separate them inconsistently over the entire length of the cable, thereby causing the impedance of the data transmission line to fluctuate up and down. This reduces the consistency required to maintain the minimum and maximum impedance, thereby negatively affecting signal integrity. In addition, the location of the ground wire can cause manufacturing problems, and the ground wire cannot be terminated by automated methods or single-wire termination. In this way, when the data transmission line and the ground line are not in the same plane, they cannot be terminated at the same time. Therefore, most ground wires on data cables are manually terminated or using secondary processes.

Summary of the invention

In order to solve the above problems, the present invention provides a data cable that does not have a ground wire while improving the shielding performance against external electromagnetic interference.

The data cable according to the present invention includes: a plurality of data transmission lines arranged in parallel with each other, a core composed of a conductive material and an outer skin layer provided on the periphery of the core; a protective layer surrounding the plurality of data transmission lines Is provided on the outer circumference of the data transmission line; a shielding layer is provided on the outer circumference of the protective layer in a winding and overlapping manner; the shielding layer includes a first metal foil layer located on the inner side, an insulating layer located in the middle, and a second layer located on the outer side Two metal foil layers, the adjacent first metal foil layer and the second metal foil layer are partially overlapped with each other.

In addition, a data cable manufacturing method related to the present invention includes the following steps: placing a plurality of data transmission lines in parallel; forming a protective layer on the outer periphery of the plurality of data transmission lines placed in parallel; forming a shield on the outer periphery of the protective layer Layer, the shielding layer includes a first metal foil layer located on the inner side, an insulating layer located in the middle, and a second metal foil layer located on the outer side, and the adjacent first metal foil layer and the second metal foil The layers partially overlap each other.

According to the data cable with the above structure, the following beneficial effects can be achieved:

(1) Eliminating the grounding wire in the data cable can prevent the frequent separation of the data transmission line within the cable length caused by the grounding wire, which makes the data transmission line more tightly constrained, resulting in a more consistent impedance value.

(2) Forming a protective layer on the outer periphery of the data transmission line can provide a tighter and greater binding force for the data transmission line, thereby reducing the possibility of a sharp increase in signal attenuation.

(3) Since the first metal foil layer and the second metal foil layer between the adjacent shielding layers are partially overlapped with each other, the area of the complete shielding layer is increased, and the anti-interference performance against external electromagnetic interference is improved.

Description of the drawings

By describing its embodiments in conjunction with the following drawings, the above-mentioned features and technical advantages of the present invention will become clearer and easier to understand.

Figure 1 is a cross-sectional view showing a data cable in the prior art;

FIG. 2 is a schematic diagram showing the winding and overlapping structure of the inner shielding layer in the prior art;

Figure 3 is a cross-sectional view showing the data cable involved in the present invention;

FIG. 4 is a schematic diagram showing the winding and overlapping structure of the inner shielding layer of the data cable according to the present invention.

detailed description

Hereinafter, embodiments of the data cable and the manufacturing method thereof according to the present invention will be described with reference to the accompanying drawings. Those of ordinary skill in the art may realize that the described embodiments can be modified in various different ways or combinations thereof without departing from the spirit and scope of the present invention. Therefore, the drawings and descriptions are illustrative in nature and are not used to limit the scope of protection of the claims. In addition, in this specification, the drawings are not drawn to scale, and the same reference numerals denote the same parts.

Fig. 3 is a cross-sectional view showing a data cable according to the first embodiment of the present invention. As shown in FIG. 2, the data cable involved in the first embodiment of the present invention includes two data transmission lines located at the innermost side, a protective layer 4 covering the outside of the two data transmission lines 1, and a protective layer 4 wound around the protective layer. Shield layer 3 outside layer 4. Among them, each data transmission line 1 includes a core 11 made of metal wires and an outer skin 12 covering the outer periphery of the core 11. The core 11 may be a single-wire conductor composed of one metal wire, or a twisted-wire structure composed of a plurality of metal wires twisted with each other. The use of a twisted structure can reduce the displacement of the core 11, stabilize the structure and transmission parameters, and have a higher ductility. Preferably, copper may be used as the core material, and the outer side of the core 11 is coated with a BTA (benzotriazole) layer. As a copper corrosion inhibitor, BTA can form a thin film on the surface of the core 11 to avoid corrosion.

After arranging the two data transmission lines 1 to be parallel to each other, a protective layer 4 is formed on the outer side of the two data transmission lines 1. The protective layer 4 may be formed of a resin material for protecting the data transmission line 1 and insulating it from the outside. Preferably, the protective layer 4 may be a polyester film tape, and an adhesive is partially coated on the polyester film tape.

The protective layer 4 can be formed by spirally winding a strip of polyester film tape on the outside of the two data transmission lines 1 using a spiral winding method, or can be formed integrally on the outer periphery of the data transmission line 1 using a resin coating process. According to the above structure, since a separate ground wire is not included and the protective layer 4 is formed on the outer periphery of the data transmission line 1, it is possible to provide tighter and greater restraint force, thereby reducing the possibility of a sharp increase in signal attenuation.

In addition, a shielding layer 3 is provided on the outer periphery of the protective layer 4. As shown in FIG. 4, the shielding layer 3 includes a first metal foil layer 31 located on the inner side, an insulating layer 32 located in the middle, and a second metal foil layer 33 located on the outer side. Preferably, the first metal foil layer 31 and the second metal foil layer 33 located on the outside can be made of metal materials such as aluminum and copper, and the insulating layer 32 can be made of FEP (perfluoroethylene propylene copolymer) material or polyester film tape. And so on.

The shielding layer 3 is formed by spirally winding a strip of shielding tape on the outer periphery of the protective layer 4 in a sequential overlapping manner. During the winding process, one side edge of the first metal foil layer 31 of the shielding layer 3 It overlaps with one side edge of the second metal foil layer 33, so that the adjacent first metal foil layer 31 and the second metal foil layer 33 are in electrical contact with each other. In this way, compared with the prior art data cable shown in FIG. 2, the area of the complete shielding layer is increased, and the shielding effect against external electromagnetic interference is improved.

In addition, when the data cable involved in the present invention is used for, for example, an HDMI cable, an outer shield layer made of metal material is provided on the outside of the data cable (usually the outside of a plurality of data cables arranged in a distributed manner). 5. The outer shielding layer 5 may be, for example, tinned annealed multiple strands of annealed copper wires woven into a mesh structure. At this time, the second metal foil layer 33 provided on the outside of the shielding layer 3 is in electrical contact with the outer shielding layer 5. Therefore, the first metal foil layer 31, the second metal foil layer 33 and the outer shielding layer 3 that are in electrical contact with each other Layer 5 forms a complete shielding structure, so that it is difficult for external electromagnetic interference to enter the inside of the data cable and interfere with the transmission performance of the high-frequency signal in the data transmission line.

The present invention also provides a manufacturing method for manufacturing the above-mentioned data cable. Hereinafter, the manufacturing method will be described in detail.

First, place the two data transmission lines 1 in parallel. At this time, the two data transmission lines 1 are preferably in close contact, but they may be kept at a predetermined distance from each other.

Then, a protective layer 4 is formed on the outer side of the two data transmission lines 1 placed in parallel. The protective layer 4 can be formed by spirally winding a strip of polyester film tape on the outside of the two data transmission lines 1 using a spiral winding method, or can be formed integrally on the outer periphery of the data transmission line 1 using a resin coating process.

Next, on the outer periphery of the protective layer 4, a shield layer 3 including a first metal foil layer located on the inner side, an insulating layer located in the middle, and a second metal foil layer located on the outer side is formed. The shielding layer 3 is formed by spirally winding a strip of shielding tape around the outer circumference of the protective layer 4 in a partially overlapping manner. In the shielding layer 3, the adjacent first metal foil layer 31 and the second metal foil layer 33 partially overlap each other to be in electrical contact.

The data cable made by the above manufacturing method does not contain a separate ground wire, and the protective layer 4 is formed on the outer circumference of the data transmission line 1, which can provide tighter and greater binding force, thereby reducing the sharp increase in signal attenuation possibility. In addition, compared with the data cable of the prior art, the area of the complete shielding layer is increased, and the shielding effect against external electromagnetic interference is improved.

In the above embodiments, a data cable including two data transmission lines is taken as an example for description, but there is no doubt that the data cable of the present invention may include one or more data transmission lines inside. In addition, the materials of the constituent elements of the data cable according to the present invention may not be limited to the materials exemplified in the above-mentioned embodiments, and other known materials may be used.

The foregoing descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc., made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

A data cable, characterized in that it comprises:

A plurality of data transmission lines arranged in parallel to each other have a core made of conductive material and a skin layer provided on the outer periphery of the core;

A protective layer, which surrounds the plurality of data transmission lines and is arranged on the outer periphery of the data transmission line;

The shielding layer is arranged on the outer periphery of the protective layer in a winding and overlapping manner. The shielding layer includes a first metal foil layer located on the inner side, an insulating layer located in the middle, and a second metal foil layer located on the outer side. A metal foil layer and a second metal foil layer partially overlap each other.
The data cable according to claim 1, wherein:

It includes two data transmission lines arranged in parallel with each other.
The data cable according to claim 1 or 2, wherein:

The protective layer is formed by winding a polyester film tape containing an adhesive around the outer circumference of the plurality of data transmission lines.
The data cable according to claim 1 or 2, wherein:

The protective layer is formed by using a resin coating process to integrally form the outer periphery of the plurality of data transmission lines.
The data cable according to claim 1 or 2, wherein:

On the outer side of the shielding layer, an outer shielding layer made of conductive material may also be provided, and the outer shielding layer is in electrical contact with the second metal foil layer on the outer side of the shielding layer.
A method for manufacturing a data cable is characterized by comprising the following steps:

Place multiple data transmission lines in parallel;

Forming a protective layer on the outer periphery of the plurality of data transmission lines placed in parallel;

A shielding layer is formed on the outer periphery of the protective layer. The shielding layer includes a first metal foil layer located inside, an insulating layer located in the middle, and a second metal foil layer located outside, and the adjacent first metal The foil layer and the second metal foil layer partially overlap each other.
The method of manufacturing a data cable according to claim 6, wherein:

The protective layer is formed by winding a polyester film tape containing an adhesive around the outer circumference of the plurality of data transmission lines.
The method of manufacturing a data cable according to claim 6, wherein:

The protective layer is formed by using a resin coating process to integrally form the outer periphery of the plurality of data transmission lines.