TW201907613A - Flat data transmission cable - Google Patents

Abstract

The present invention relates to a flat data transmission cable. The flat data transmission cable includes a number of wires. The wires includes a plurality pairs of differential signal wires and a grounding wire arranged in a row with the differential signal wires. Each differential signla wires compose of a first wire and a second wire. The first and second wires each has a conductor located in the center thereof, a first coating layer enclosing the conductor and a second coating layer enclosing the first coating layer. The permittivity of the first coating layer is lower than that of the second coating layer. The wires are arranged in at least two rows and enclosed by a common first shield. Therefore, the flat data transmission cable would have a higher space utilization.

Description

Flat data transmission cable

The present invention relates to a flat data transmission cable, and more particularly to a flat data transmission cable with high space utilization.

In the 3C industry, the transmission cable can serve as a medium for electrical connection between two electronic devices and can stably perform the expected signal transmission operation, so that the transmission cable is 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, more and more wires are transmitted through the cable. If the wires are still placed in the same row, the width of the transmission cable is increased, which is not conducive to the practical application of the transmission cable.

In view of this, it is indeed necessary to further improve the conventional flat data transmission cable to solve the above problems.

It is an object of the present invention to provide a flat data transmission cable with high space utilization.

To achieve the above object, the present invention provides a flat data transmission cable comprising a plurality of wires, the plurality of wires having a differential signal pair composed of a first wire and a second wire and arranged side by side with the first wire and the second wire a grounding conductor, the first wire and the second wire respectively having a conductor at a central position, a first cladding layer covering the periphery of the conductor, and a second cladding covering the periphery of the first cladding layer a cladding layer, wherein a dielectric constant of the first cladding layer is lower than a dielectric constant of the second cladding layer; the plurality of wires are arranged in parallel in at least two rows, and are integrally wrapped on the outer side of at least two rows of wires The first outer layer.

As a further improvement of the present invention, at least two rows of the wires have the same number of first wires, second wires, and ground wires, and are respectively disposed correspondingly.

As a further improvement of the present invention, the first cladding layer is formed of an insulating material having a dielectric constant of 2.1 to 2.4, and the second cladding layer is formed of an insulating material having a dielectric constant of 3.2 to 3.5.

As a further improvement of the present invention, the flat data transmission cable further includes a second outer layer covering the upper and lower sides of the at least one row of wires.

As a further improvement of the present invention, the flat data transmission cable further includes a second outer layer that simultaneously covers the upper and lower sides of each row of wires.

As a further improvement of the present invention, the first outer layer covers the second outer layer on the upper side of the uppermost row of wires and the second outer layer on the lower side of the lowermost row of wires to fix the at least two rows of wires.

As a further improvement of the present invention, the second outer layer is formed of an insulating material having a dielectric constant of 2.56 to 4.2.

As a further improvement of the present invention, the grounding conductor has a conductor at a central location and a cladding layer overlying the periphery of the conductor.

As a further improvement of the present invention, the conductor wires of the first wire, the second wire and the ground wire have the same specifications, and the center line of the ground wire and the adjacent first wire or the second wire and the first wire and the second wire The center spacing of the wires is the same.

As a further improvement of the present invention, the flat data transmission cable has a thickness of 1.6 mm.

Compared with the prior art, the flat data transmission cable of the present invention is provided with at least two rows of wires, thereby improving the space utilization of the flat data transmission cable and saving material.

Please refer to the first to second figures together for the first embodiment of the flat data transmission cable of the present invention. The flat data transmission cable 100 includes a plurality of wires 1 and a first outer layer 2 for positioning and protecting a plurality of the wires 1.

The plurality of wires 1 are arranged in parallel in at least two rows. Each row of wires 1 has a first wire 11, a second wire 12, and a ground wire 13 disposed side by side with the first wire 11 and the second wire 12. The first wire 11 is disposed adjacent to the second wire 12, and the ground wire 13 is disposed adjacent to the first wire 11 or the second wire 12.

The first wire 11 and the second wire 12 form a differential signal pair, which can be used to transmit a high frequency signal, and the ground wire 13 can be used to suppress signal interference of the differential signal to the side. In the present embodiment, each row of wires 1 has a differential array of spaced-apart pairs of ground conductors 13 disposed therebetween. The grounding conductor 13 can isolate adjacent pairs of differential signal pairs to prevent mutual interference.

At least two rows of the wires 1 have the same number of first wires 11, second wires 12 and ground wires 13, and are respectively disposed correspondingly. In this embodiment, the flat data transmission cable 100 has only two rows of the wires 1.

The first wire 11 and the second wire 12 respectively have a conductor 14 at a central position, a first cladding layer 15 covering the periphery of the conductor 14, and a periphery of the first cladding layer 15 The second cladding layer 16 has a lower dielectric constant than the dielectric constant of the second cladding layer 16.

The first cladding layer 15 is formed of an insulating material having a dielectric constant of 2.1 to 2.4 to provide a better signal transmission environment for the conductor 14, reducing signal propagation delay, reducing crosstalk between signals, and ensuring high speed and effective signal. Transmission, reducing signal attenuation.

The second cladding layer 16 has a relatively high dielectric constant, and is made of a material having a dielectric constant of 3.2 to 3.5 in the present invention, and is preferably made of an absorbing material that absorbs electromagnetic waves. The absorbing layer can be used to absorb electromagnetic waves radiated from the outside, effectively suppress external electromagnetic interference, effectively isolate the conductor 14 from the outside, and ensure high-frequency and ultra-high-frequency signal transmission; in addition, the absorbing layer has light quality, The performance of temperature resistance, moisture resistance, corrosion resistance, etc., can effectively protect the conductor 14 located on the inner side, prolonging the service life of the data transmission cable of the present invention; further, the absorbing layer can also be made of high-density plastic material having absorbing properties. It is made to effectively utilize the tensile strength of the material to enhance the mechanical strength of the flat data transmission cable 100.

In this embodiment, the cladding layer 17 of the grounding conductor 13 is only provided as one layer, and the cladding layer 17 is made of an insulating material to the conductor 14 of the grounding conductor 13 and the adjacent first conductor 11 or second conductor 12. The conductor 14 constitutes an insulating isolation.

At least two outer rows of wires 1 are coated with a first outer layer 2 on the outer side. The first outer layer 2 covers the upper side of the uppermost row of wires 1 and the lower side of the lowermost row of wires 1 to relatively position and protect at least two rows of wires 1. The first outer layer 2 is also disposed between each row of wires 1 to space the wires 1 in each row.

In other embodiments, the flat data transmission cable 100 may further include a second outer layer 3 covering at least one row of the upper and lower sides of the wire 1 on the basis of the first embodiment.

As shown in the third figure, in the second embodiment of the present invention, the flat data transmission cable 100 has two rows of wires 1 and includes only one second outer layer 3 covering the upper and lower sides of the upper row of wires 1. In the embodiment, the second outer layer 3 only fixes the upper row of wires 1, and the first outer layer 2 simultaneously fixes the upper and lower rows of wires 1.

As shown in FIG. 4, in the third embodiment of the present invention, the flat data transmission cable 100 further includes a second outer layer 3 covering the upper and lower sides of each row of wires 1 at the same time. The second outer layer 3 is used for protecting and positioning each row of wires 1, and the first outer layer 2 covers the second outer layer 3 on the upper side of the uppermost row of wires 1 and the lower side of the lowermost row of wires 1 The second outer layer 3 is used to fix the at least two rows of wires 1.

The first outer layer 2 and the second outer layer 3 may both be an outer cover layer or a cover film, and the first outer cover layer 2 and the second outer cover layer 3 have better weather resistance and fatigue resistance. The material is made of, for example, a thermoplastic elastomer TPE (Thermoplastic Elastomer) material to provide better protection to the inner conductor 1 and to improve the service life of the flat data transmission cable 100 of the present invention.

The dielectric constant of the first outer layer 2 and the second outer layer 3 is 0.8-1.2 times the dielectric constant of the second cladding layer 16, and the specific dielectric constant may be 2.56-4.2, thereby ensuring the first outer layer. The difference between the dielectric constant of the layer 2 and the second outer layer 3 and the dielectric coefficient of the second cladding layer 16 adjacent thereto is small, and thus does not affect the overall dielectric constant of the flat data transmission cable 100 of the present invention. To ensure high frequency signal transmission.

The flat data transmission cable 100 of the present embodiment having two rows of wires 1 has a thickness of 1.6 mm.

In addition, in the present invention, the outer diameter of the conductor 14 is set in the range of 28 to 31 American wire gauge (AWG); wherein, when the outer diameter of the conductor 14 is 28 AWG, at least the first wire 11 and the second wire The center spacing of the wires 12 is set to 0.51 mm to 0.75 mm; when the outer diameter of the conductor 14 is 29 AWG, at least the center spacing of the first wire 11 and the second wire 12 is set to 0.38 mm to 0.75 mm, and the outer diameter of the conductor 14 When 30 to 31 AWG is employed, at least the center pitch of the first wire 11 and the second wire 12 is set to be 0.38 mm to 0.62 mm.

By setting the outer diameter of the conductor 14 and the center distance 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, and the effective control is 80 Ω to 100 Ω. The coupling effect is enhanced to ensure long-distance transmission of high-frequency signals.

Preferably, in the present invention, the wire gauge specifications of the conductors 14 of the first wire 11, the second wire 12 and the ground wire 13 and the center distance between adjacent ones are all set to be the same.

In addition, in combination with the cladding layer of the first wire 11 and the second wire 12 in the embodiment, in order to ensure high frequency signal transmission in the first wire 11 and the second wire 12 in the present invention, both The differential impedance between the two is controlled between 85 Ω and 100 Ω, and the first wire 11 and the second wire 12 are further disposed as follows: when the conductors 14 of the first wire 11 and the second wire 12 are set to 28 to 29 AWG, The center spacing 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 conductor 14 of the first wire 11 and the second wire 12 is set to 30 to 31 AWG, the first wire is made The center-to-center spacing of the 11 and second wires 12 is set to 0.45 to 0.55 mm, preferably 0.5 mm; thereby, long-distance transmission of high-frequency signals can be further ensured.

The flat data transmission cable 100 of the present invention is provided with at least two rows of wires 1, so that the space utilization of the flat data transmission cable 100 can be improved, and materials can be saved; and the second outer layer 3 is provided for each row of wires 1 After positioning, all the wires 1 are positioned by the first outer layer 2, so that the wires 1 are well positioned and arranged neatly.

100‧‧‧flat data transmission cable

1‧‧‧ wire

2‧‧‧Insert substrate

3‧‧‧ docking

11‧‧‧ rear end face

12‧‧‧ side

13‧‧‧ bearing surface

14‧‧‧First fixed slot

15‧‧‧First wire receiving slot

16‧‧‧Second wire receiving slot

17‧‧‧ Third wire receiving slot

The first figure is a perspective view of a flat data transmission cable of a first embodiment of the present invention. The second figure is a schematic cross-sectional view of the flat data transmission cable shown in the first figure. The third figure is a schematic cross-sectional view of a flat data transmission cable of a second embodiment of the present invention. Figure 4 is a cross-sectional view showing a flat data transmission cable of a third embodiment of the present invention.

Claims (10)

A flat data transmission cable comprising a plurality of wires, the plurality of wires having a differential signal pair composed of a first wire and a second wire and a ground wire disposed side by side with the first wire and the second wire, the first wire And the second wire respectively has a conductor at a central position, a first cladding layer covering the periphery of the conductor, and a second cladding layer covering the periphery of the first cladding layer, the first package The dielectric constant of the cladding layer is lower than the dielectric constant of the second cladding layer; wherein the plurality of wires are arranged in parallel in at least two rows, and a first outer layer is co-coated on the outer side of at least two rows of wires. In the flat data transmission cable of claim 1, the at least two rows of the wires have the same number of first wires, second wires and ground wires, and are respectively disposed correspondingly. The flat data transmission cable of claim 1, wherein the first cladding layer is formed of an insulating material having a dielectric constant of 2.1 to 2.4, and the second cladding layer has a dielectric constant of 3.2 to 3.5. The insulating material is formed. The flat data transmission cable of claim 3, wherein the flat data transmission cable further comprises a second outer layer covering the upper and lower sides of the at least one row of wires. The flat data transmission cable of claim 3, wherein the flat data transmission cable further comprises a second outer layer that covers both upper and lower sides of each row of wires. The flat data transmission cable of claim 5, wherein the first outer layer covers a second outer layer on the upper side of the uppermost row of wires and a second outer layer on the lower side of the lowermost row of wires to At least two rows of wires are fixed. A flat data transmission cable according to claim 4 or 5 or 6, wherein the second outer layer is formed of an insulating material having a dielectric constant of 2.56 to 4.2. The flat data transmission cable of claim 1, wherein the grounding conductor has a conductor at a central location and a cladding covering the periphery of the conductor. The flat data transmission cable of claim 1, wherein the first wire, the second wire and the ground wire have the same conductor wire gauge, and the ground wire is adjacent to the center of the adjacent first wire or the second wire. The pitch and the center spacing of the first wire and the second wire are the same. The flat data transmission cable of claim 1, wherein the flat data transmission cable has a thickness of 1.6 mm.