WO2018040958A1

WO2018040958A1 - Data transmission cable

Info

Publication number: WO2018040958A1
Application number: PCT/CN2017/098142
Authority: WO
Inventors: 陈亿昌
Original assignee: 凡甲电子(苏州)有限公司
Priority date: 2016-08-31
Filing date: 2017-08-18
Publication date: 2018-03-08

Abstract

A data transmission cable (100), comprising a first conductive line (11) and a second conductive line (12) arranged adjacent to each other, the first conductive line (11) and the second conductive line (12) respectively having a conductor (13) located at a central position and coating layers (14, 15) coating the periphery of the conductor (13), an outer diameter of the conductor (13) being within the American wire gauge range of 28 to 32, wherein when the outer diameter of the conductor (13) is 28 AWG, the centre distance between the first conductive line (11) and the second conductive line (12) is 0.51 mm to 0.75 mm; when the outer diameter of the conductor (13) is 29 AWG, the centre distance between the first conductive line (11) and the second conductive line (12) is 0.38 mm to 0.75 mm; when the outer diameter of the conductor (13) is 30 to 31 AWG, the centre distance between the first conductive line (11) and the second conductive line (12) is 0.38 mm to 0.62 mm; and when the outer diameter of the conductor (13) is 32 AWG, the centre distance between the first conductive line (11) and the second conductive line (12) is 0.32 mm to 0.5 mm. By setting the outer diameter of the conductor (13) and the centre distance between the first conductive line (11) and the second conductive line (12), the differential impedance between the conductive lines is effectively reduced, the coupling effect is enhanced, and the long-distance transmission of a high-frequency signal is ensured.

Description

Data transmission cable

This application claims the Chinese patent application with the application date of August 31, 2016, the application number is 201610793947.1, the invention name is "data transmission cable", and the application date is August 07, 2017, the application number is 201710667017.6, the name of the invention The priority of the Chinese Patent Application for "Data Transmission Cables" is incorporated herein by reference in its entirety.

Technical field

The present invention relates to a data transmission cable, and more particularly to a data transmission cable that meets requirements and has high frequency performance.

Background technique

In the 3C industry, a transmission cable can serve as a medium for electrical connection between two electronic devices and can stably perform desired signal transmission operations, and thus, transmission cables are generally applied to various electronic devices. Among them, transmission cables connected to interfaces such as USB, HDMI, DVI, and Displayport have high transmission rate, long distance, high quality, and are popular among the public, and the number of uses is also increasing. The transmission cable has a plurality of metal wires inside, and the metal wires are externally covered with an insulating layer to isolate a short circuit between the metal signal wires. However, with the development of computer technology, the data transmission speed of computer hard disk and motherboard and other electronic products is getting faster and faster, and the transmission frequency is getting higher and higher. In the field of high frequency and ultra high frequency data transmission, the differential of differential signal lines is controlled. Impedance is very important for the integrity of high-speed digital signals. It is generally required to be controlled between 80Ω and 100Ω. Traditional wire settings are no longer sufficient.

In view of this, it is necessary to improve the existing data transmission cable to solve the above problems.

Summary of the invention

It is an object of the present invention to provide a data transmission cable that meets the requirements and has high frequency performance.

In order to achieve the above object, the present invention provides a data transmission cable including a first wire and a second wire disposed adjacently, the first wire and the second wire respectively having conductors and packages at a central position a cladding covering the periphery of the conductor; the outer diameter of the conductor is in the range of 28 to 32 American wire gauge (AWG), wherein when the outer diameter of the conductor is 28 AWG, the center spacing of the first wire and the second wire is set to 0.51 mm to 0.75 mm; when the outer diameter of the conductor is 29 AWG, the center distance of the first wire and the second wire is set to 0.38 mm to 0.75 mm, and when the outer diameter of the conductor is 30 to 31 AWG, the first wire and The center pitch of the second wire is set to 0.38 mm to 0.62 mm; when the outer diameter of the conductor is 32 AWG, the center pitch of the first wire and the second wire is set to 0.32 mm to 0.5 mm.

As a further improvement of the present invention, the first wire and the second wire constitute a differential signal pair, and the cladding layers of the first wire and the second wire respectively comprise a first cladding layer covering the periphery of the conductor and are coated on a second cladding layer on the periphery of the first cladding layer, the first cladding layer having a lower dielectric constant than the second cladding layer.

As a further improvement of the present invention, when the outer diameter of the conductor is 28 to 29 AWG, the center pitch of the first wire and the second wire is set to 0.585 to 0.685 mm, and when the outer diameter of the conductor is 30 to 31 AWG, The center-to-center spacing of the first wire and the second wire is set to 0.45 mm to 0.55 mm; when the outer diameter of the conductor is 32 AWG, the center-to-center spacing of the first wire and the second wire is set to 0.4 mm to 0.5 mm.

As a further improvement of the present invention, when the outer diameter of the conductor is 28 to 29 AWG, the center distance of the first wire and the second wire is set to 0.635 mm, and when the outer diameter of the conductor is 30 to 31 AWG, the first The center-to-center spacing of the wire and the second wire is set to 0.5 mm; when the outer diameter of the conductor is 32 AWG, the center-to-center spacing of the first wire and the second wire is set to 0.45 mm.

As a further improvement of the present invention, the differential impedance between the first wire and the second wire is 100 Ω.

As a further improvement of the present invention, when the outer diameter of the conductor is 31 AWG, the center spacing of the first wire and the second wire is set to 0.42 mm; when the outer diameter of the conductor is 32 AWG, the first wire and the second wire The center pitch of the wires is set to be 0.37 mm to 0.38 mm.

As a further improvement of the present invention, the differential impedance between the first wire and the second wire is 85 Ω.

As a further improvement of the present invention, the first cladding layer is formed using an insulating material having a dielectric constant of 2.1 to 2.4.

As a further improvement of the present invention, the second cladding layer has a dielectric constant of 3.2 to 3.5.

As a further improvement of the present invention, the data transmission cable further includes an outer cladding layer covering the outer side of the first wire and the second wire at the same time, and the dielectric constant of the outer cladding layer is the dielectric coefficient of the second cladding layer 0.8-1.2 times.

As a further improvement of the present invention, the data transmission cable further includes a cover film covering the upper side and the lower side of the first wire and the second wire at the same time, and the dielectric constant of the cover film is a dielectric layer of the second cladding layer The coefficient is 0.8-1.2 times.

As a further improvement of the present invention, the data transmission cable further includes a third wire disposed side by side with the first wire and the second wire, the third wire being disposed adjacent to the first wire or the second wire, and also having the same a conductor at a central location and a cladding covering the periphery of the conductor, the first wire, the second wire, and the third wire having the same conductor gauge, and the third wire and the adjacent first wire or second The center-to-center spacing of the wires is the same as the center-to-center spacing of the first and second wires.

As a further improvement of the present invention, the first conductive and second wires constitute a differential signal pair, and the third wire is a ground wire.

According to the present invention, by setting the outer diameter of the conductor and the center distance of the corresponding first wire and the second wire, the differential relationship between the first wire and the second wire can be effectively reduced when the first wire and the second wire are set as differential signal pairs. Effectively controlled between 80Ω and 100Ω, the coupling effect is enhanced to ensure long-distance transmission of high-frequency signals.

DRAWINGS

1 is a perspective view of a preferred embodiment of a data transmission cable of the present invention;

2 is a schematic cross-sectional view of the data transmission cable of FIG. 1.

detailed description

In order to make the objects, technical solutions, and advantages of the present invention more comprehensible, the present invention will be described in detail below with reference to the specific embodiments and drawings.

Please refer to FIG. 1 and FIG. 2 for a preferred embodiment of the data transmission cable 100 of the present invention. The data transmission cable 100 includes at least one wire group 1. The wire group 1 includes a first wire 11 and a second wire 12 which are arranged side by side and adjacent to each other.

In the present embodiment, the data transmission cable 100 further includes a third wire 2 disposed side by side with the first wire 11 and the second wire 12. The third wire 2 is disposed adjacent to the first wire 11 or the second wire 12. The first wire 11 and the second wire 12 are differential signal pairs and can be used to transmit high frequency signals. The third wire 2 is a ground wire and can be used to suppress signal interference of the differential signal to the side. In the present embodiment, the data transmission cable 100 includes a plurality of sets of the differential signal pairs spaced apart by the grounding wire 2, and the differential signal pairs are all arranged side by side. The grounding conductor 2 can isolate adjacent pairs of differential signal pairs to prevent mutual interference.

Referring to FIGS. 1 and 2, the first wire 11, the second wire 12, and the third wire 2 respectively have a conductor 13 at a central position and a cladding layer coated on the outside of the conductor 3.

In this embodiment, the covering layers of the first wire 11 and the second wire 12 respectively include a first cladding layer 14 covering the periphery of the conductor 13 and covering the periphery of the first cladding layer 14 . The second cladding layer 15. In the present invention, the dielectric constant of the first cladding layer 14 is lower than the dielectric constant of the second cladding layer 15.

The first cladding layer 14 is disposed to have a relatively low dielectric constant, and is mainly used to provide a better signal transmission environment of the conductor 13, reduce signal propagation delay, reduce crosstalk between signals, and ensure high-speed and effective transmission of signals. The signal attenuation is reduced; in the embodiment, the first cladding layer 14 is disposed to be formed of an insulating material having a dielectric constant of 2.1 to 2.4.

In addition, the second cladding layer 15 is disposed to have a relatively high dielectric constant, mainly to suppress external electromagnetic interference, thereby effectively isolating the conductor 13 from the outside, and ensuring high-frequency and ultra-high-frequency signal transmission. In the present invention, a material having a dielectric constant of 3.2 to 3.5 is used, and an absorbing material that absorbs electromagnetic waves is preferably used to form an absorbing layer, whereby the absorbing layer 15 can be used to absorb electromagnetic waves radiated from the outside, thereby effectively suppressing The external electromagnetic interference effectively isolates the conductor 13 from the outside to ensure high-frequency and ultra-high-frequency signal transmission. In addition, the absorbing layer 15 also has the characteristics of light weight, temperature resistance, moisture resistance, corrosion resistance, etc., thereby effectively protecting The conductor 13 on the inner side extends the service life of the data transmission cable 100 of the present invention; further, the absorbing layer 15 can also be made of a high-density plastic material having absorbing properties to effectively utilize the tensile strength of the material. The mechanical strength of the data transmission cable 100 is enhanced.

In addition, in the present embodiment, since the third wire 2 is provided as a grounding wire, the cladding layer is only provided as one layer, and the cladding layer is made of an insulating material to the conductor 13 of the grounding wire 2 and The adjacent first conductor 11 or the conductor 13 of the second conductor 12 constitutes an insulating isolation.

Further, the data transmission cable 100 further includes an outer layer 3 for relatively positioning and protecting the first wire 11, the second wire 12 and the ground wire 2 of the wire group 1. The outer layer 3 may be an outer cover layer which is simultaneously coated on the outer side of the wire group 1 and the ground wire 2, or a cover film which simultaneously covers the upper side and the lower side of the wire group 1 and the ground wire 2 for positioning. The outer layer 3 is made of a material having good weather resistance and fatigue resistance, such as a thermoplastic elastomer TPE (Thermoplastic Elastomer) material, to the inner first, second and

third wires

11, 12, 2 Better protection is formed to improve the service life of the data transmission cable 100 of the present invention.

The dielectric constant of the outer layer 3 is set to be close to the dielectric constant of the second cladding layer 15 to avoid affecting the overall dielectric constant of the data transmission cable 100 of the present invention and to ensure high frequency signal transmission. In the present invention, the outer layer 3 is made of a material having a dielectric constant of 0.8 to 1.2 times the dielectric constant of the second cladding layer 15.

Further, in the present invention, the outer diameter of the conductor 13 is set in the range of 28 to 32 American wire gauge (AWG); wherein, when the outer diameter of the conductor 13 is 28 AWG, at least the first wire 11 and the first The center spacing of the two wires 12 is set to be 0.51 mm to 0.75 mm; when the outer diameter of the conductor 13 is 29 AWG, at least the center spacing of the first wire 11 and the second wire 12 is set to be 0.38 mm to 0.75 mm, at the outer diameter of the conductor When 30 to 31 AWG is used, at least the center spacing of the first wire 11 and the second wire 12 is set to be 0.38 mm to 0.62 mm; when the outer diameter of the conductor 13 is 32 AWG, the first wire 11 and the second wire 12 are The center spacing is set from 0.32 mm to 0.5 mm.

By the outer diameter of the conductor 13 and the center-to-center spacing of the corresponding first wire 11 and the second wire 12, the differential impedance between the first wire 11 and the second wire 12 can be effectively reduced, effectively controlled at 80 Ω to 100 Ω. The coupling effect is enhanced to ensure long-distance transmission of high-frequency signals.

Preferably, in the present embodiment, the wire gauge specifications of the conductors 13 of the first wire 11, the second wire 12 and the third wire 2 and the center distance between the adjacent two are all set to be the same.

Further, further, when the conductors 13 of the first wire 11 and the second wire 12 are set to 28 to 29 AWG, the center pitch of the first wire 11 and the second wire 12 is set to 0.585 to 0.685 mm, preferably 0.635 mm; when the conductors 13 of the first wire 11 and the second wire 12 are set to 30 to 31 AWG, the center pitch of the first wire 11 and the second wire 12 is set to 0.45 to 0.55 mm, preferably 0.5 mm. When the outer diameter of the conductor 13 is 32 AWG, the center distance of the first wire 11 and the second wire 12 is set to 0.4 mm to 0.5 mm, preferably 0.45 mm; and at the same time, by adjusting the coating layer, for example, in the present invention The first cladding layer 14 and the second cladding layer 15 are disposed such that the differential impedance between the first wire 11 and the second wire 12 is controlled to be 100 Ω.

Further, when the outer diameter of the conductor is 31 AWG, the center pitch of the first wire 11 and the second wire 12 is set to be set to be larger than 0.38 mm and smaller than 0.45 mm, preferably 0.42 mm, and passed through the cladding layer. The adjustment arrangement, such as the arrangement of the first cladding layer 14 and the second cladding layer 15 described above in the present invention, allows the differential impedance between the first wire 11 and the second wire 12 to be controlled at 85 Ω.

When the outer diameter of the conductor 13 is 32 AWG, the center distance between the first wire 11 and the second wire 12 is set to 0.37 mm to 0.38 mm, and is adjusted by a coating layer, for example, the first package described above in the present invention. The arrangement of the cladding layer 14 and the second cladding layer 15 allows the differential impedance between the first wire 11 and the second wire 12 to be controlled at 85 Ω.

In combination with the above specific arrangements, the wires can be specifically configured according to requirements, and the outer diameter of the conductor 13 in the present invention is relatively small, and the first cladding layer 14 and the second cladding layer 15 can be provided with a larger design. Space or reduce the size of the data transmission cable 100.

The above embodiments are only used to illustrate the technical solutions of the present invention, and the present invention is not limited thereto. Although the present invention is described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or substituted. Without departing from the spirit and scope of the technical solutions of the present invention.

Claims

A data transmission cable comprising adjacent first and second wires, the first wire and the second wire respectively having a conductor at a central position and a cladding covering the periphery of the conductor; The feature is that the outer diameter of the conductor is in the range of 28 to 32 American wire gauge (AWG), wherein when the outer diameter of the conductor is 28 AWG, the center distance of the first wire and the second wire is set to be 0.51 mm to 0.75 mm; When the outer diameter of the conductor is 29 AWG, the center distance of the first wire and the second wire is set to 0.38 mm to 0.75 mm, and when the outer diameter of the conductor is 30 to 31 AWG, the center distance of the first wire and the second wire It is set to 0.38 mm to 0.62 mm; when the outer diameter of the conductor is 32 AWG, the center distance of the first wire and the second wire is set to be 0.32 mm to 0.5 mm.
The data transmission cable according to claim 1, wherein the first wire and the second wire constitute a differential signal pair, and the cladding layers of the first wire and the second wire respectively cover the periphery of the conductor. a first cladding layer and a second cladding layer covering the periphery of the first cladding layer, the first cladding layer having a lower dielectric constant than the second cladding layer.
The data transmission cable according to claim 1 or 2, wherein when the outer diameter of the conductor is 28 to 29 AWG, the center-to-center spacing of the first wire and the second wire is set to 0.585 to 0.685 mm. When the outer diameter of the conductor is 30 to 31 AWG, the center distance of the first wire and the second wire is set to 0.45 mm to 0.55 mm; when the outer diameter of the conductor is 32 AWG, the center distance of the first wire and the second wire is set It is 0.4mm to 0.5mm.
The data transmission cable according to claim 3, wherein when the outer diameter of the conductor is 28 to 29 AWG, the center distance of the first wire and the second wire is set to 0.635 mm, and the outer diameter of the conductor is used. At 30 to 31 AWG, the center-to-center spacing of the first and second wires is set to 0.5 mm; when the outer diameter of the conductor is 32 AWG, the center-to-center spacing of the first and second wires is set to 0.45 mm.
A data transmission cable according to claim 4, wherein the differential impedance between said first wire and said second wire is 100 Ω.
The data transmission cable according to claim 1 or 2, wherein when the outer diameter of the conductor is 31 AWG, the center distance of the first wire and the second wire is set to 0.42 mm; At 32 AWG, the center spacing of the first wire and the second wire is set to be 0.37 mm to 0.38 mm.
A data transmission cable according to claim 6, wherein the differential impedance between said first wire and said second wire is 85 Ω.
The data transmission cable according to claim 2, wherein said first cladding layer is formed of an insulating material having a dielectric constant of 2.1 to 2.4.
The data transmission cable according to claim 8, wherein said second cladding layer has a dielectric constant of 3.2 to 3.5.
The data transmission cable according to claim 9, wherein the data transmission cable further comprises an outer cladding layer covering the outer side of the first wire and the second wire at the same time, and a dielectric constant of the outer cladding layer It is 0.8-1.2 times the dielectric constant of the second cladding layer.
The data transmission cable according to claim 9, wherein said data transmission cable further comprises a cover film covering both upper and lower sides of said first and second wires, said dielectric of said cover film The coefficient is 0.8-1.2 times the dielectric constant of the second cladding layer.
The data transmission cable according to claim 1, wherein the data transmission cable further comprises a third wire disposed alongside the first wire and the second wire, the third wire being adjacent to the first wire or The second wire is disposed, and also has a conductor at a central position and a cladding layer covering the periphery of the conductor, the conductor wires of the first wire, the second wire, and the third wire are of the same specification, and the third wire is The center spacing of the adjacent first or second conductors is the same as the center spacing of the first and second conductors.
The data transmission cable according to claim 12, wherein said first conductive and second wires constitute a differential signal pair, and said third wire is a ground wire.