TWI661438B - Data transmission cable - Google Patents

Abstract

The present invention provides a data transmission cable, which includes a first wire and a second wire disposed adjacently. wire. The first wire and the second wire respectively have a conductor at a center position and a covering layer covering the periphery of the conductor. The outer diameter of the conductor of the first wire is the same as the outer diameter of the conductor of the second wire, and the ratio between the center distance between the first wire and the second wire and the outer diameter of the conductor is 1.7 to 2.35.

Description

Data transmission cable

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

In the 3C industry, transmission cables can be used as a medium for electrical connection between two electronic devices and can stably perform the expected signal transmission operations. As a result, transmission cables are widely used in various electronic devices. Among them, the transmission cables connected to USB, HDMI, DVI, Displayport and other interfaces have high transmission rates, long distances, and high quality. They are popular with the public and the number of use is increasing. These transmission cables have multiple metal wires inside, and the metal wires are covered with an insulation layer to isolate short circuits between the metal signal wires. However, with the development of computer technology, the data transmission speed of electronic products such as computer hard disks and motherboards 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, control differential signal lines. Differential impedance is very important for the integrity of high-speed digital signals, and traditional wire settings can no longer meet the requirements.

In view of this, it is indeed necessary to further improve the traditional data transmission cables to solve the above problems.

The purpose of the present invention is to provide a data transmission cable which is convenient to meet 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 adjacent to each other, the first wire and the second wire having a conductor at a center position and covering the periphery of the conductor, respectively. The outer diameter of the conductor of the first wire and the outer diameter of the second wire are the same, and the ratio between the center distance between the first wire and the second wire and the outer diameter of the conductor is 1.7 to 2.35.

As a further improvement of the present invention, the first wire and the second wire constitute a differential signal pair, and the cladding layer is configured to: a distance between a center of the first wire and the second wire and an outer diameter of the conductor. When the ratio between them is 1.7 to 2.35, the differential impedance between the first lead and the second lead is 78Ω to 107Ω.

As a further improvement of the present invention, when the ratio between the center distance between the first wire and the second wire and the outer diameter of the conductor is 1.7 to 2.0, the difference between the first wire and the second wire The impedance is 78Ω to 92Ω.

As a further improvement of the present invention, when the ratio between the center distance between the first wire and the second wire and the outer diameter of the conductor is 2.05 to 2.35, the difference between the first wire and the second wire The impedance is 93Ω to 107Ω.

As a further improvement of the present invention, the aforementioned covering layers of the first and second leads respectively include a first covering layer covering the periphery of the conductor and a second covering layer covering the periphery of the first covering layer. The dielectric constant of the first cladding layer is lower than that of the second cladding layer.

As a further improvement of the present invention, the first cladding layer is made of an insulating material, and the second cladding layer is a wave absorbing layer.

As a further improvement of the present invention, when the outer diameter of the conductor is 31 AWG, the center distance between the first wire and the second wire is set to be greater than 0.38 mm and less than 0.45 mm. The differential impedance between one lead and the second lead is 85Ω.

As a further improvement of the present invention, when the outer diameter of the conductor is 32 AWG, the center distance between the first lead and the second lead is set to 0.4 mm to 0.5 mm, and the difference between the first lead and the second lead is The impedance is 100Ω.

As a further improvement of the present invention, when the outer diameter of the conductor is 32 AWG, the center distance between the first lead and the second lead is set to 0.37 mm to 0.38 mm, and the difference between the first lead and the second lead is The impedance is 85Ω.

As a further improvement of the present invention, the first wire and the second wire form a differential signal pair, and the data transmission cable further includes a third wire disposed side by side with the first wire and the second wire, and the third wire is grounded. A conductive wire, the third conductive wire being disposed adjacent to the first conductive wire or the second conductive wire, and also having a conductor at a center position and a covering layer covering the periphery of the conductive wire, the first conductive wire, the second conductive wire, and the third conductive wire The conductor wire gauge specifications of the wires are the same, and the center distance between the third wire and the adjacent first or second wire is the same as the center distance between the first wire and the second wire.

According to the present invention, the matching of the outer diameter of the conductor and the corresponding center distance between the first wire and the second wire allows the first wire and the second wire to be set as differential signal pairs by simply adjusting the coating layer. The differential impedance between the two is effectively reduced, and within the required control range, the coupling effect is enhanced to ensure long-distance transmission of high-frequency signals.

100‧‧‧data transmission cable

1‧‧‧ lead set

11‧‧‧ the first wire

12‧‧‧Second Lead

13‧‧‧Conductor

14‧‧‧first coating

15‧‧‧second coating

2‧‧‧Third lead, ground lead

3‧‧‧ outer cover

The first diagram is a schematic perspective view of a preferred embodiment of a data transmission cable according to the present invention.

The second figure is a schematic cross-sectional view of the data transmission cable shown in the first figure.

Please refer to the first figure and the second figure together 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 arranged side by side and adjacent to each other.

In this embodiment, the data transmission cable 100 further includes a third wire 2 arranged 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. Wherein, the first conducting wire 11 and the second conducting wire 12 are differential signal pairs, which can be used for transmitting high-frequency signals. The third wire 2 is a ground wire, which can be used to suppress the interference of the differential signal on the side signal. In this embodiment, the data transmission cable 100 includes a plurality of differential signal pairs that are arranged at intervals by ground wires, and the differential signal pairs are all arranged side by side. The ground wire 2 can isolate adjacent two pairs of differential signal pairs to prevent mutual interference.

Please refer to the first and second figures. The first lead 11, the second lead 12, and the third lead 2 respectively have a conductor 13 at a center position and a covering layer covering the outside of the conductor 13. The outer diameter of the conductor 13 of the first wire 11 and the outer diameter of the conductor 13 of the second wire 12 are the same, and the ratio between the center distance between the first wire 11 and the second wire 12 and the outer diameter of the conductor 13 It is 1.7 to 2.35. With this setting, the differential impedance between the two can be effectively reduced by simply adjusting the cladding layer. Effectively controlling the generally required range of 75Ω to 110Ω, the coupling effect is enhanced to ensure the long distance of high-frequency signals. transmission.

Wherein, in the present invention, the coating layer is set as follows: when the ratio between the center distance between the first lead 11 and the second lead 12 and the outer diameter of the conductor 13 is 1.7 to 2.35, the first The differential impedance between one lead 11 and the second lead 12 is 78Ω to 107Ω. Specifically, when the ratio between the center distance between the first lead 11 and the second lead 12 and the outer diameter of the conductor 13 is 1.7 to 2.0, the distance between the first lead 11 and the second lead 12 The differential impedance is 78Ω to 92Ω. To the first wire 11 When the ratio between the center distance between the second lead 12 and the outer diameter of the conductor 13 is 2.05 to 2.35, the differential impedance between the first lead 11 and the second lead 12 is 93Ω to 107Ω.

Furthermore, when the ratio between the center distance between the first lead 11 and the second lead 12 and the outer diameter of the conductor 13 is 1.8 to 1.9, the distance between the first lead 11 and the second lead 12 The differential impedance is 80Ω to 90Ω. When the ratio between the center distance between the first lead 11 and the second lead 12 and the outer diameter of the conductor 13 is 2.15 to 2.25, the differential impedance between the first lead 11 and the second lead 12 is 95Ω to 105Ω.

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

The first cladding layer 14 is made of an insulating material with a relatively low dielectric constant. The first cladding layer 14 is mainly used to provide a better signal transmission environment for the conductor 13, reduce the propagation delay of signals, and reduce crosstalk between signals. To ensure high-speed and effective transmission of signals and reduce signal attenuation. The second cladding layer 15 is set to have a relatively high dielectric constant, mainly for suppressing external electromagnetic interference, so as to effectively isolate the conductor 13 from the outside, and ensure high-frequency and ultra-high-frequency signal transmission; it is preferably set to absorb Floor.

In addition, in this embodiment, because the third wire 2 is provided as a ground wire, the cladding layer thereof is provided as only one layer, and the cladding layer is made of an insulating material, so that the conductor 13 and the phase of the ground wire 2 The conductors 13 of the adjacent first lead 11 or second lead 12 constitute insulation.

Further, the data transmission cable 100 further includes an outer cover 3 that relatively positions and protects the first wire 11, the second wire 12, and the ground wire 2 of the wire group 1. The outer covering layer 3 may be an outer covering layer covering both the outer side of the wire group 1 and the ground wire 2 or covering the wire group 1 at the same time. And grounding wires 2 for positioning on the upper and lower sides. The outer cover layer 3 is made of a material with good weather resistance and fatigue resistance, for example, a thermoplastic elastomer TPE (Thermoplastic Elastomer) material, so that the inner first, second, and third wires 11, 12, 2 It forms better protection and improves the service life of the data transmission cable 100 of the present invention. In addition, the dielectric coefficient of the outer cover layer 3 is set close to the dielectric coefficient of the second cladding layer 15 to avoid affecting the overall dielectric coefficient of the data transmission cable 100 of the present invention and ensure high-frequency signal transmission.

Further, it is exemplified in detail that the outer diameter of the conductor 13 is 31 or 32 American Wire Gauge (AWG); wherein when the outer diameter of the conductor 13 is 31 AWG, the center of the first lead 11 and the second lead 12 When the pitch is set to 0.38 to 0.45 mm, preferably 0.42 mm, the first cladding layer 14 and the second cladding layer 15 in the present invention can be adjusted by the cladding layer. The differential impedance between the lead 11 and the second lead 12 is controlled at 85Ω.

When the outer diameter of the conductor 13 is 32 AWG, the center distance between the first lead 11 and the second lead 12 is set to 0.4 mm to 0.5 mm, preferably 0.45 mm, and is adjusted by the coating, such as this In the invention, the arrangement of the first cladding layer 14 and the second cladding layer 15 can control the differential impedance between the first lead 11 and the second lead 12 to 100Ω.

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

In combination with the above specific settings, the conductors can be configured in a targeted manner according to requirements, and the outer diameter of the conductor 13 in the present invention is relatively small, which can provide a larger design for the first coating layer 14 and the second coating layer 15 Space or reduce the size of the data transmission cable 100.

In particular, it should be pointed out that for those skilled in the art, equivalent changes to the present invention made under the teaching of the present invention should still be included in the scope claimed by the patent application scope of the present invention.

Claims (5)

A data transmission cable includes a first wire and a second wire disposed adjacent to each other, the first wire and the second wire respectively having a conductor at a center position and a covering layer covering the periphery of the conductor; the first The outer diameter of the conductor of the wire is the same as the outer diameter of the conductor of the second wire; wherein the ratio between the center distance between the first and second wires and the outer diameter of the conductor is 1.7 to 2.35; the first wire Forms a differential signal pair with the second wire. When the outer diameter of the conductor is 32 AWG, the center distance between the first wire and the second wire is set to 0.4 mm to 0.5 mm, and the distance between the first wire and the second wire is set. The differential impedance is 100Ω. The data transmission cable according to item 1 of the scope of the patent application, wherein the covering layers of the first and second conductive wires respectively include a first covering layer covering the periphery of the conductor and a covering layer surrounding the first coating layer. The second cladding layer has a dielectric constant lower than that of the second cladding layer. The data transmission cable according to item 2 of the scope of patent application, wherein the first covering layer is made of an insulating material, and the second covering layer is a wave absorbing layer. The data transmission cable according to item 1 of the scope of patent application, wherein when the outer diameter of the conductor is 32 AWG, the center distance between the first wire and the second wire is set to 0.37 mm to 0.38 mm, and the first wire The differential impedance with the second wire is 85Ω. The data transmission cable according to item 1 of the scope of patent application, wherein the data transmission cable further includes a third wire arranged side by side with the first wire and the second wire, the third wire is a ground wire, and the third wire The wire is arranged adjacent to the first wire or the second wire, and also has a conductor at the center position and a covering layer covering the periphery of the conductor. The wire gauge specifications of the first wire, the second wire, and the third wire The center distance between the third wire and the adjacent first or second wires is the same as the center distance between the first wire and the second wire.