CN211427918U

CN211427918U - HDMI cable

Info

Publication number: CN211427918U
Application number: CN202020169899.0U
Authority: CN
Inventors: 李先俊
Original assignee: Jining Haifu Electronic Technology Co Ltd
Current assignee: Jining Haifu Electronic Technology Co Ltd
Priority date: 2019-02-18
Filing date: 2020-02-14
Publication date: 2020-09-04
Anticipated expiration: 2030-02-14
Also published as: WO2020168672A1; CN110033898A

Abstract

The utility model provides a HDMI cable, it includes: an innermost core layer including at least one or more uniaxial cables and an insulating layer disposed around the one or more uniaxial cables; an outer cable layer disposed on an outer periphery of the core layer, the outer cable layer including one or more twinaxial cables and one or more uniaxial cables, wherein an outer surface of the twinaxial cable is made of a conductive metal material; the outer shielding layer is arranged on the periphery of the outer cable layer, is made of a conductive metal material and is in close contact with partial outer surfaces of the double-shaft cables of the outer cable layer; and the cable sheath is wrapped on the periphery of the outer shielding layer and made of insulating materials. According to the HDMI cable with the structure, the cross section area of the cable can be reduced, and the performance of resisting external electromagnetic interference when high-frequency video data are transmitted can be enhanced.

Description

HDMI cable

This application claims priority to chinese patent application No. 201910123570.2 filed on 2019, 2, 18, the entire contents of which are incorporated herein by reference.

Technical Field

The utility model relates to a cable technical field, specifically speaking relates to an anti outside electromagnetic interference performance's when can strengthen transmission high frequency data signal HDMI cable.

Background

With the rapid development of multimedia technology, people have raised higher and higher requirements on multimedia transmission quality, and especially the demand for high-definition multimedia is increased, and multimedia for simply transmitting video or audio signals cannot meet the demand of the present society. An HDMI line, i.e., a High Definition Multimedia Interface line, is an abbreviation of High Definition Multimedia Interface, is a digital video/audio Interface technology, and can transmit uncompressed High Definition video and multi-channel audio data with High quality; meanwhile, the digital-to-analog or analog-to-digital conversion is not needed before signal transmission, and the transmission of the video-audio signal with the highest quality can be ensured. In standard HDMI cables, flexibility and durability are desirable because the cable undergoes multiple repeated bends over its lifetime.

Fig. 1 is a cross-sectional view showing an HDMI cable according to the related art, and fig. 2 is a cross-sectional view showing a twinaxial cable used in the HDMI cable according to the related art. As shown in fig. 1, a conventional HDMI cable generally includes a plurality of dual-axis data lines 100 and a plurality of single-axis signal lines 200, and the dual-axis data lines 100 and the single-axis signal lines 200 are twisted with each other. As shown in fig. 2, the biaxial data line 100 used here includes two data transmission lines 1 parallel to each other, a ground line 2 made of a metal conductor, a shield layer 3 covering the data transmission lines 1 and the ground line 2, and a protective layer 4 located outside the shield layer 3. The data transmission line 1 includes a core 11 made of a metal wire and an outer sheath 12 covering the core. The ground line 2 is disposed in the vicinity of the data transmission line 1 along the longitudinal direction of the data transmission line 1, and then the two data transmission lines 1 and the ground line 2 are wound and covered with the shielding layer 3. Then, a protective layer 4 is further formed on the outer side of the shielding layer 3 to prevent the shielding layer 3 from being opened during bending and twisting.

Further, as shown in fig. 3, the shield layer 3 of the biaxial data line 100 includes a first metal foil layer 31 on the inner side and an insulating layer 32 on the outer side, and the first metal foil layer 31 plays a role of shielding electromagnetic interference from the outside. The shielding layer 3 is spirally wound on the outer sides of the two data transmission lines 1 and the grounding line 2 in a sequentially overlapped manner. As shown in fig. 2, in the process of winding the shield layer 3, the first metal foil layer 31 is wound so as to be positioned inside the cable and the insulating layer 32 is positioned outside, one side edge portion of the first metal foil layer 31 and an edge portion of the insulating layer 32 wound before are in lap contact with each other, and the other side edge portion of the first metal foil layer 31 is in contact with the ground line 2. Thus, external electromagnetic interference may be introduced into the cable through the insulation layer 32 between the wound first metal foil layers 31, and may cause interference to the data signals transmitted in the data transmission line 1. Especially when the data line 1 transmits a high-frequency video signal, the influence of external electromagnetic interference is more significant.

The HDMI cable having the above-described structure has no problem in transmitting a data signal of a normal frequency, but when a high-frequency data signal of the 5G era is transmitted, external electromagnetic interference enters the HDMI cable, and interferes with the high-frequency data signal transmitted therein.

SUMMERY OF THE UTILITY MODEL

In order to solve the above problems, the utility model provides an use the biax data line of novel structure, and improved the position of arranging of biax data line to anti outside electromagnetic interference performance's when reinforcing transmission high frequency data signal HDMI cable.

The utility model relates to a pair of HDMI cable, include: an innermost core layer including at least one or more uniaxial cables and an insulating layer disposed around the one or more uniaxial cables; an outer cable layer disposed on an outer periphery of the core layer, the outer cable layer including one or more twinaxial cables, wherein an outer surface of the twinaxial cable is made of a conductive metal material; the outer shielding layer is arranged on the periphery of the outer cable layer, is made of a conductive metal material and is in close contact with partial outer surfaces of the double-shaft cables of the outer cable layer; and the cable sheath is made of insulating materials and wraps the periphery of the outer shielding layer.

Furthermore, preferably, the outer cable layer further comprises more than one uniaxial cable.

Further, preferably, the biaxial cables and the uniaxial cables of the outer cable layer are arranged in a single layer around the core layer.

Still further, preferably, the core layer further comprises one or more filler cords, the filler cords being disposed within the barrier layer.

Further, preferably, the one or more uniaxial cables are disposed at a position between the adjacent biaxial cables in the outer cable layer.

Further, preferably, the twin axial cable includes: two data transmission lines arranged in parallel with each other, each of the two data transmission lines having a core made of a conductive material and an outer skin layer provided on the outer periphery of the core; a protective layer surrounding the two data transmission lines and disposed on the outer periphery of the data transmission lines; the shielding layer is arranged on the periphery of the protective layer in a winding and overlapping mode, the shielding layer is provided with a first metal foil layer positioned on the inner side, an insulating layer positioned in the middle and a second metal foil layer positioned on the outer side, and the adjacent first metal foil layer and the second metal foil layer are partially overlapped with each other.

Further, it is preferable that the protective layer is formed by integrally forming outer circumferences of the two data transmission lines by a resin coating process.

Furthermore, preferably, the outer shielding layer is made of a mesh-like soft copper wire material.

Still further, it is preferable that the outer cable layer includes four of the biaxial cables and two of the uniaxial cables, the four of the biaxial cables and the two of the uniaxial cables being arranged in a single layer around the core layer, the uniaxial cables being respectively disposed between the adjacent biaxial cables.

According to as above the utility model discloses, owing to utilize outer shielding layer to couple together the inside and outside shielding layer of biax cable, increased whole shielding layer's area from this, improved anti outside electromagnetic interference's shielding performance. In addition, the inner shielding layer and the outer shielding layer of each double-shaft cable are connected through the outer shielding layer to form an integral large-area shielding layer, and the shielding performance of resisting external electromagnetic interference is further improved.

Furthermore, the utility model relates to a biax cable that uses in the HDMI cable does not possess solitary earth connection, utilizes the shielding layer of self to realize the ground connection function, consequently, has reduced the cross-sectional area of HDMI cable, can realize the miniaturization of cable.

Drawings

The above features and technical advantages of the present invention will become more apparent and readily appreciated from the following description of the embodiments thereof, taken in conjunction with the accompanying drawings.

Fig. 1 is a cross-sectional view showing a related art HDMI cable;

fig. 2 is a cross-sectional view showing a twinaxial cable in the HDMI cable of the related art;

fig. 3 is a schematic view showing a shield layer winding and overlapping manner of a twinaxial cable used in a HDMI cable of the related art;

fig. 4 is a cross-sectional view showing an internal structure of an HDMI cable of the present invention;

fig. 5 is a partially enlarged view showing a portion B of the HDMI cable shown in fig. 4;

fig. 6 is a cross-sectional view showing a biaxial cable used in the HDMI cable of the present invention;

fig. 7 is a schematic diagram showing a winding and overlapping manner of the shield layer of the twinax cable used in the HDMI cable of the present invention.

Detailed Description

Next, an embodiment of an HDMI cable relating to the present invention will be described with reference to the drawings. Those of ordinary skill in the art will recognize 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. Accordingly, the drawings and description are illustrative in nature and not intended to limit the scope of the claims. Furthermore, in the present description, the drawings are not to scale and like reference numerals refer to like parts.

Fig. 4 is a cross-sectional view showing an internal structure of the HDMI cable of the present invention. As shown in fig. 4, the HDMI cable according to the present invention includes a core layer located at the innermost side and an outer cable layer located at the periphery of the core layer. The core layer includes one or more uniaxial cables 10 and an insulating layer 7 covering the one or more uniaxial cables, and the uniaxial cables 10 are uniformly arranged around the central axis of the core layer. Furthermore, the core layer may further include more than one filling strand 8, and it is preferable that the filling strands 8 are respectively disposed at positions between the adjacent uniaxial cables 10. The filling rope 8 is used for enhancing the strength of the HDMI cable, and the material of the filling rope can be PP (polypropylene), PE (polyethylene), and the like.

In the HDMI cable of the present embodiment, the core layer includes three uniaxial cables 10 and three filler strings 8, the three uniaxial cables are uniformly distributed around the central axis of the core layer, and one filler string 8 is provided at each position between adjacent uniaxial cables 10. Further, an insulating layer is formed to cover the three uniaxial cables 10 and the three filler strings 8, and the insulating layer is preferably formed of an insulating material, and may be formed of a metallic shielding material for shielding. However, without being limited thereto, the core layer may include 3-5 uniaxial cables and a plurality of filling strings.

An outer cable layer is provided on the outer circumference of the core layer, and the outer cable layer includes one or more twin-axial cables 300. The outer cable layer may also include more than one single-axis cable 10. The twin axial cable 300 and the single axial cable 10 may transmit data signals of different properties, respectively, for example, the twin axial cable 300 is used to transmit video data of high frequency requiring high transmission quality, and the single axial cable 10 may transmit control signals requiring ordinary transmission quality. These twin-axial cable 300 and single-axial cable 10 are disposed around the core layer, preferably arranged in a single-layer structure.

In this embodiment, the outer cable layer is provided with four biaxial cables and two uniaxial cables which are arranged in order in a single layer structure on the outer periphery of the core layer, and the four uniaxial cables are respectively provided between the adjacent biaxial cables.

An outer shielding layer 5 is wrapped on the periphery of the outer side cable layer, and a cable sheath 6 is wrapped on the periphery of the outer shielding layer 5. The outer shielding layer 5 can be made of a tinned annealed reticular soft copper wire material, and can also be made of a metal foil with electromagnetic shielding performance. As shown in fig. 5, the inner surface of the outer shield layer 5 closely contacts a part of the outer side surface of each twinaxial cable 300 in the outer cable layer. The cable sheath 6 may be made of, for example, PVC (polyvinyl chloride), and the shore a hardness thereof is preferably not more than 65.

Next, the structure of an embodiment of a twin-wire cable used in an HDMI cable according to the present invention will be described with reference to fig. 6 and 7. Fig. 6 is a cross-sectional view showing a biaxial cable used in the HDMI cable of the present invention; fig. 7 is a schematic diagram showing a winding and overlapping manner of the shield layer of the twinax cable used in the HDMI cable of the present invention.

As shown in fig. 6 and 7, the twin-axial cable 300 includes two data transmission lines 1 located at the innermost side, a protective layer 4 covering the two data transmission lines 1, and a shield layer 3 wound around the protective layer 4. Each data transmission line 1 includes a core 11 made of a metal wire and a sheath 12 covering the outer periphery of the core 11. The core 11 may be a single wire conductor made of one metal wire or a stranded wire structure made of a plurality of metal wires stranded with each other. The displacement of the core body 11 can be reduced by adopting a stranded structure, so that the structure and transmission parameters are stable, and the core body has higher extensibility. Preferably, the core material may use copper, and a BTA (benzotriazole) layer is coated on the outside of the core 11. BTA as a copper corrosion inhibitor can form a film on the surface of the core 11 to avoid corrosion.

After the two data transmission lines 1 are arranged in parallel with each other, a protective layer 4, which may be formed of, for example, a resin material for protecting and insulating the data transmission lines 1 from the outside, is formed on the outer sides of the two data transmission lines 1. Preferably, the protective layer 4 may be a mylar tape on which an adhesive is partially coated.

The protective layer 4 may be formed by spirally winding a strip-shaped mylar tape around the outer sides of the two data transmission lines 1 by a spiral winding method, or may be integrally formed on the outer peripheries of the data transmission lines 1 by a resin coating process. According to the above structure, since a separate ground line is not included and the protective layer 4 is formed on the outer circumference of the data transmission line 1, it is possible to provide tighter and greater restraining force, thereby reducing the possibility of a sharp increase in signal attenuation.

Further, the shield layer 3 is provided on the outer periphery of the protective layer 4. As shown in fig. 4, the shield layer 3 includes a first metal foil layer 31 on the inner side, an insulating layer 32 in the middle, and a second metal foil layer 33 on the outer side. Preferably, the first and second metal foil layers 31 and 33 may be formed of a metal material such as aluminum, copper, etc., and the insulation layer 32 may be formed of an FEP (perfluoroethylene propylene copolymer) material, a mylar tape, etc.

The shielding layer 3 is formed by spirally winding a strip-shaped shielding tape around the outer periphery of the protective layer 4 in a sequentially overlapping manner, and in the winding process, one side edge portion of the first metal foil layer 31 of the shielding layer 3 is overlapped with one side edge portion 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. Thus, compared with the data cable in the prior art shown in fig. 2, the area of the complete shielding layer is increased, and the shielding effect on external electromagnetic interference is improved.

As described above, the outer shield layer 5 made of a metal material of the HDMI cable is in close contact with the outer surface of each twinaxial cable located at the outer cable layer, so that, as shown in fig. 7, the outer shield layer 5 and the second metal foil layer 33 as the outer surface of each twinaxial cable 300 are electrically connected. Thereby, the inner first metal foil layer 31 and the outer second metal foil layer 33 of each twinaxial cable are electrically connected by the outer shield layer 5. Furthermore, the outer shield layer 5 electrically connects the first metal foil layer 31 and the second metal foil layer of the plurality of biaxial cables. In this way, the area of the overall shield layer of the twinaxial cable is greatly increased compared to the prior art. In particular, when the HDMI cable transmits high-frequency video data, electromagnetic interference from the outside can be well shielded.

In addition, since the HDMI cable of the present invention uses the two-axis cable as described above, the two-axis cable does not have a separate ground wire, but realizes a ground function by the shield layer 3, and therefore, the cross-sectional area of the cable can be reduced compared to the HDMI cable in the related art, and the HDMI cable can be miniaturized.

In the above embodiments described with reference to the drawings, it is illustrated that the core layer includes one or more uniaxial cables and one or more filling cords, but the core layer may not include filling cords; further, the outer cable layer is illustrated as including one or more twinaxial cables and one or more uniaxial cables, but the outer cable may not include the uniaxial cables.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An HDMI cable, comprising:

an innermost core layer including at least one or more uniaxial cables and an insulating layer disposed around the one or more uniaxial cables;

an outer cable layer disposed on an outer periphery of the core layer, the outer cable layer including one or more twinaxial cables, wherein an outer surface of the twinaxial cable is made of a conductive metal material;

the outer shielding layer is arranged on the periphery of the outer cable layer, is made of a conductive metal material and is in close contact with partial outer surfaces of the double-shaft cables of the outer cable layer; and

and the cable sheath is made of insulating materials and wraps the periphery of the outer shielding layer.

2. The HDMI cable of claim 1,

the outer cable layer also includes more than one single-axis cable.

3. The HDMI cable of claim 2,

the twinaxial cables and the uniaxial cables of the outer cable layer are arranged in a single layer around the core layer.

4. The HDMI cable according to any of claims 1 to 3,

the core layer also includes one or more filler cords disposed within the barrier layer.

5. The HDMI cable according to any of claims 2 to 3,

the one or more uniaxial cables are arranged at a position between the adjacent biaxial cables in the outer cable layer.

6. The HDMI cable according to any of claims 1 to 3,

the twin-axial cable includes: two data transmission lines arranged in parallel with each other, each of the two data transmission lines having a core made of a conductive material and an outer skin layer provided on the outer periphery of the core; a protective layer surrounding the two data transmission lines and disposed on the outer periphery of the data transmission lines; the shielding layer is arranged on the periphery of the protective layer in a winding and overlapping mode, the shielding layer is provided with a first metal foil layer positioned on the inner side, an insulating layer positioned in the middle and a second metal foil layer positioned on the outer side, and the adjacent first metal foil layer and the second metal foil layer are partially overlapped with each other.

7. The HDMI cable of claim 6,

the protective layer is formed by integrally forming the outer peripheries of the two data transmission lines by using a resin coating process.

8. The HDMI cable according to any of claims 1 to 3,

the outer shielding layer is made of a reticular soft copper wire material.

9. The HDMI cable of claim 1,

the outer cable layer includes four biaxial cables and two uniaxial cables, the four biaxial cables and the two uniaxial cables are arranged in a single layer around the core layer, and the uniaxial cables are respectively arranged between the adjacent biaxial cables.