CN209729555U - flat data transmission cable - Google Patents

Abstract

The utility model provides a flat data transmission cable, which includes a plurality of wires arranged side by side, and the wires at least include a pair of differential signal wires and a ground wire. Each lead respectively has a conductor at the center, a first cladding layer covering the periphery of the conductor, and a second cladding layer covering the periphery of the first cladding layer. The dielectric constant of the first cladding layer is lower than that of the second cladding layer. The data transmission cable further includes a plastic layer covering a plurality of the wires, and a metal layer formed by spirally winding a metal strip on the outside of the plastic layer. The metal layer at least has an aluminum foil layer and an adhesive layer disposed on the side of the aluminum foil layer facing the plastic layer, and the metal layer is bonded and fixed on the outside of the plastic layer after being thermally melted by the adhesive layer.

Description

flat data transmission cable

technical field

The utility model relates to a data transmission cable, in particular to a flat data transmission cable with better high-frequency transmission performance.

Background technique

In the 3C industry, the transmission cable can be used as a medium for electrical connection between two electronic devices and can stably perform expected signal transmission operations. Therefore, the transmission cable is widely used in various electronic devices. Among them, transmission cables connected to interfaces such as USB, HDMI, DVI, and Displayport have high transmission rates, long distances, and high quality, and are popular with the public, and the number of uses is also increasing. These transmission cables have a plurality of metal wires inside, including differential signal wires and ground wires. The plurality of metal wires are usually fixed only by the outer Mylar layer and the metal layer, and air usually exists between the metal layer and the wires after fixing, thereby affecting the high-frequency transmission performance of the wires. In addition, with the development of computer technology, the data transmission speed of computer hard disks and motherboards and other electronic products is getting faster and faster, and the transmission frequency is getting higher and higher. Impedance is very important to the integrity of high-speed digital signals, and the traditional wire arrangement can no longer meet the requirements.

Therefore, it is necessary to improve the existing technology to overcome the above technical problems.

Utility model content

The purpose of the utility model is to provide a flat data transmission cable with better high-frequency transmission performance.

In order to achieve the purpose of the above utility model, the utility model provides a flat data transmission cable, which includes a plurality of wires arranged side by side, the wires at least include a pair of differential signal wires and ground wires, and each wire has a The conductor at the position, the first cladding layer covering the periphery of the conductor, the second cladding layer covering the periphery of the first cladding layer, the dielectric coefficient of the first cladding layer is lower than that of the second cladding layer Dielectric coefficient; the data transmission cable also includes a plastic layer covering several of the wires, a metal layer formed by spirally winding a metal strip on the outside of the plastic layer, and the metal layer has at least an aluminum foil layer and an adhesive layer arranged on the side of the aluminum foil layer facing the plastic layer, the metal layer is bonded and fixed on the outer side of the plastic layer after thermal melting of the adhesive layer.

As a further improvement of the present utility model, the first cladding layer is an insulating cladding layer, and the second cladding layer is a wave-absorbing layer.

As a further improvement of the present invention, the metal layer also has an insulating layer arranged on the surface of the aluminum foil layer away from the plastic layer.

As a further improvement of the present invention, the sum of the thicknesses of the aluminum foil layer and the insulating layer in the metal layer is 0.010 mm to 0.055 mm.

As a further improvement of the utility model, the width of the metal strip is 0.5 to 3 times the line width.

As a further improvement of the present invention, when the metal strip is spirally wound on the outside of the plastic layer, an overlapping area is formed, and the winding overlap rate of the metal strip is 15% to 50% of the width of the metal strip.

As a further improvement of the present invention, the width of the overlapping area is at least 0.8mm.

As a further improvement of the present invention, the winding angle of the metal material strip in the width direction of the flat data transmission cable is 40° to 55°.

As a further improvement of the present invention, the distance from the outer edge of the conductor of the flat data transmission cable to the outer edge of the plastic layer is 0.1 mm to 0.45 mm.

As a further improvement of the present invention, the outer diameters of the conductors of the differential signal lines are the same, and the ratio between the center distance of the aforementioned differential signal lines and the outer diameter of the conductors of the differential signal lines is 1.5 to 2.8.

The beneficial effect of the present utility model is: the utility model The utility model sets the dielectric coefficient of the first cladding layer on the inside of the outside of the wire to be lower than the dielectric coefficient of the second cladding layer on the outside, so that it can be passed The first cladding layer with a smaller dielectric coefficient provides a better signal transmission environment for the first conductor, while the second cladding layer with a higher dielectric coefficient can effectively suppress external electromagnetic interference and effectively communicate between the first conductor and the outside world. isolation to ensure the transmission of high-frequency and ultra-high-frequency signals; moreover, the metal layer is arranged on the outside of the plastic layer by spiral winding through the metal strip, which can realize the tight winding and bonding between the metal layer and the plastic layer; in addition , set the adhesive layer on the side of the metal layer facing the plastic layer, not only can the metal layer be directly fixed on the outside of the plastic layer by bonding, without the intervention of the mylar layer, so that the entire cable can be made thinner, It is softer; and the air can be discharged while bonding, and because of the bonding and fixation, the discharged air cannot enter, achieving a compact effect, and then achieving a tight coating, good high-frequency transmission performance, soft and light effect.

Description of drawings

FIG. 1 is a partial perspective view of a preferred embodiment of the flat data transmission cable of the present invention.

Fig. 2 is a front view of the flat data transmission cable shown in Fig. 1 .

Fig. 3 is a top view of the flat data transmission cable shown in Fig. 1 .

Detailed ways

The utility model will be described in detail below in conjunction with various embodiments shown in the accompanying drawings. However, these embodiments do not limit the present utility model, and the structural, method, or functional changes made by those skilled in the art according to these embodiments are all included in the protection scope of the present utility model.

Please also refer to FIG. 1 to FIG. 3 , which are the first preferred embodiment of the flat data transmission cable 100 of the present invention. The flat data transmission cable 100 includes several wires 1 arranged side by side. The wires 1 include at least a pair of differential signal wires 2 and a ground wire 3 . The arrangement of the wires 1 is a circular arrangement of the ground wires 3 and the differential signal wires 2 , and the number of the wires 1 arranged side by side is between 3 and 50. At least the outer diameters of the conductors 11 of each pair of differential signal lines 2 are the same. In the present invention, the outer diameters of the conductors 11 of all wires 1 are the same, and the spacing is also the same.

Each wire 1 has a conductor 11 at the center, a first cladding layer 12 covering the periphery of the conductor 11 , and a second cladding layer 13 covering the periphery of the first cladding layer 12 .

In the present invention, the dielectric constant of the first cladding layer 12 is set to be lower than that of the second cladding layer 13 .

Specifically, in the present utility model, the first cladding layer 12 is set to be made of an insulating material with a relatively low dielectric coefficient, which is mainly used to provide a better signal transmission environment for each conductor 11 and reduce signal interference. Propagation delay ensures high-speed and effective signal transmission and reduces signal attenuation. The second cladding layer 13 is set to have a relatively high dielectric coefficient, mainly to suppress external electromagnetic wave interference, thereby effectively isolating each conductor 11 from the outside world and ensuring internal high-frequency and ultra-high-frequency signal transmission; The second cladding layer 13 is preferably set as a wave-absorbing layer.

Further, the flat data transmission cable 100 in the present invention also includes a plastic layer 4 covering a plurality of the wires 1, and a metal layer 5 formed by spirally winding a metal strip on the outside of the plastic layer 4. . In the present invention, the metal layer 5 has at least an aluminum foil layer 51 and an adhesive layer 52 disposed on the side of the aluminum foil layer 51 facing the plastic layer 4, so that the metal layer 5 can be heated through the adhesive layer 52. Bonding and fixing on the outer surface of the plastic layer 4 after melting.

In the present utility model, on the one hand, the metal layer 5 is arranged on the outside of the plastic layer 4 in a spiral winding manner through the metal material strip, so that the tight winding and bonding between the metal layer 5 and the plastic layer 4 can be realized; on the other hand, on the metal layer 5 The side facing the plastic layer 4 is provided with an adhesive layer 52, which not only can directly fix the metal layer 5 on the outside of the plastic layer 4 by bonding, but also does not require the intervention of the mylar layer, so that the entire cable can be made thinner , softer; and the air can be discharged while bonding, and because of the bonding and fixation, the discharged air cannot enter, so as to avoid the influence of air on the transmission of high-frequency signals, and at the same time achieve a compact effect, and then achieve a tight coating. Good high-frequency transmission performance and soft and thin effect.

Combined with the arrangement of the first cladding layer 12, the second cladding layer 13, the plastic layer 4 and the metal layer 5, it can ensure that the ratio between the center-to-center distance of each pair of differential signal lines 2 and the outer diameter of the conductor 11 is When the value is 1.5 to 2.8, the differential impedance of each pair of differential signal lines 2 can be effectively reduced, effectively controlled within the generally required range of 75Ω to 110Ω, and the coupling effect is enhanced to ensure long-distance transmission of high-frequency signals.

Specifically, the above-mentioned settings of the present utility model can ensure that when the ratio between the center distance of each pair of differential signal lines 2 and the outer diameter of its conductor 11 is 1.5 to 2.8, the distance between each pair of differential signal lines 2 is ensured. The differential impedance is 79Ω to 106Ω.

In the present invention, the plastic layer 4 wraps around the wire 1 , and its overall thickness after wrapping is between 0.3 mm and 1 mm, preferably between 0.3 mm and 0.55 mm. The thickness of the plastic layer 4 can be set as thin as possible, at least to ensure that the relative positions of all the wires 1 are fixed. And the plastic layer 4 above can be set to be made of a plastic material with a dielectric coefficient close to that of air, so that the impedance of the plastic layer 4 can be made smaller, thereby further providing a better signal transmission environment for the differential signal line 2 and reducing signal propagation. Delay and interference, ensure high-speed and effective signal transmission, and reduce signal attenuation.

Furthermore, in the present invention, the distance between the outer edge of the conductor 11 in the flat data transmission cable 100 and the outer edge of the plastic layer 4 is preferably between 0.1 mm and 0.45 mm, preferably 0.15 mm to 0.35 mm. between mm. The above-mentioned distance is also the distance between the conductor 11 and the metal layer 5. Because the metal layer 5 is used to shield external signal interference and ensure the transmission of high-frequency and ultra-high-frequency signals, the above-mentioned distance is also for affecting the high-frequency transmission of the wire 1. As one of the elements of data transmission, the smaller the distance, the smaller the impedance and the better the high-frequency performance. At the same time, the thickness of the entire flat data transmission cable 100 is also smaller, making it softer and thinner. However, if the thickness is too small, the metal layer 5 will affect the signal transmission of the conductor 11, and the above range of the present invention can better meet various requirements.

In addition, as shown in FIG. 2 , the arrangement of the aluminum foil layer 51 in the metal layer 5 can effectively shield external electromagnetic interference, that is, effectively isolate the differential signal line 2 from the outside world, and ensure high-frequency and ultra-high-frequency signal transmission. In addition, the metal layer 5 also has a fireproof function.

In combination with the above, in the present invention, the cladding layer on the outside of the conductor 11 is set, which can make the conductor 11 of the differential signal line 2 have a better signal transmission environment when transmitting information, reduce the propagation delay of the signal, and ensure the high-speed and effective transmission of the signal , reduce signal attenuation, while avoiding external interference. The metal layer 5 is arranged on the outside of the plastic layer 4 by means of spiral winding through the metal material strip, so that the tight winding and bonding between the metal layer 5 and the plastic layer 4 can be realized; An adhesive layer 52 is provided on one side, not only the metal layer 5 can be directly fixed on the outside of the plastic layer 4 by bonding, without the intervention and fixation of the mylar layer, so that the entire cable can be made thinner and more flexible; At the same time of bonding, the air can also be discharged, and because of the bonding and fixation, the discharged air cannot enter, avoiding the influence of air on the transmission of high-frequency signals, and at the same time achieve a compact effect, and then achieve tight coating, good high-frequency transmission performance and Soft and light effect.

Specifically, when the ratio between the center-to-center distance of each pair of differential signal lines 2 and the outer diameter of its conductor 11 is 1.55 to 2.31, the differential impedance between each pair of differential signal lines 2 can be 79Ω to 91Ω.

In order to further ensure the softness and thinness of the flat data transmission cable 100, the outer diameter of the conductor 11 in the present invention adopts 31AWG or 32AWG or 33AWG. At this time, the center-to-center distance of each pair of the differential signal lines 2 is set to 0.28mm to 0.52mm. mm, it can ensure that the differential impedance between each pair of the differential signal lines 2 is 79Ω to 91Ω. For every 0.01mm difference in the center-to-center distance, the differential impedance differs by 1.5Ω.

Wherein, when the outer diameter of the conductor 11 is 31AWG, the center-to-center spacing of each pair of the differential signal lines 2 is set to 0.44 to 0.52mm, which can ensure that the differential impedance between each pair of the differential signal lines 2 is 79Ω to 91Ω; Specifically, when the center-to-center distance is 0.48mm, the differential impedance between each pair of the differential signal lines 2 can be controlled at 85Ω.

When the outer diameter of the conductor 11 is 32AWG, setting the center-to-center spacing of each pair of differential signal lines 2 to 0.36 to 0.44mm can ensure that the differential impedance between each pair of differential signal lines 2 is 79Ω to 91Ω. Specifically, when the center-to-center distance is 0.40 mm, the differential impedance between each pair of the differential signal lines 2 can be controlled at 85Ω.

When the outer diameter of the conductor 11 is 33AWG, setting the center-to-center spacing of each pair of differential signal lines 2 to 0.28 to 0.36mm can ensure that the differential impedance between each pair of differential signal lines 2 is 79Ω to 91Ω. Specifically, when the center-to-center distance is 0.32 mm, the differential impedance between the differential signal lines 2 can be controlled at 85Ω.

In addition, when the ratio between the center-to-center distance of each pair of differential signal lines 2 and the outer diameter of its conductor 11 is 2.18 to 2.84, the differential impedance between each pair of differential signal lines 2 is 94Ω to 106Ω.

In order to further ensure the softness and thinness of the flat data transmission cable 100, the outer diameter of the conductor 11 in the present invention is 33AWG or 34AWG; at this time, the center-to-center distance of each pair of differential signal lines 2 is set to 0.35mm to 0.51mm, It can be ensured that the differential impedance of each pair of the differential signal lines 2 is 94Ω to 106Ω. For every 0.01mm difference in the center-to-center distance, the differential impedance differs by 1.5Ω.

Among them, in the present utility model, when the outer diameter of the conductor 11 is 33AWG, the center-to-center spacing of each pair of the differential signal lines 2 is set to 0.43 to 0.51mm, which can ensure that the differential impedance of each pair of the differential signal lines 2 is 94Ω to 106Ω; specifically, when the center-to-center distance is 0.47mm, the differential impedance between each pair of the differential signal lines 2 can be controlled at 100Ω.

When the outer diameter of the conductor 11 is 34AWG, setting the center-to-center spacing of each pair of differential signal lines 2 to 0.35 to 0.43mm can ensure that the differential impedance of each pair of differential signal lines 2 is 94Ω to 106Ω; specifically, in When the center-to-center distance is 0.39mm, the differential impedance between each pair of differential signal lines 2 can be controlled at 100Ω.

In addition, the metal layer 5 in the present invention also has an insulating layer 53 arranged on the surface of the aluminum foil layer 51 facing away from the plastic layer 4. The setting of the insulating layer 53 can replace the mylar layer in the prior art and provide external insulation. , while protecting the aluminum foil layer 51 .

Further, in the metal layer 5, the sum of the thicknesses of the aluminum foil layer 51 and the insulating layer 53 is between 0.010mm and 0.055mm, preferably between 0.015mm and 0.025mm, so as to minimize the overall thickness on the basis of external shielding. The thickness of the cable.

In addition, for the selection of the above-mentioned spirally wound metal strip, the utility model adopts a width that is 0.5 to 3 times the width of the flat data transmission cable 100, preferably 0.5 to 2 times. Under this width range, Winding is more convenient and it is convenient to grasp the tightness of winding, and at the same time, it can also ensure the softness of the entire data transmission cable after winding.

Further, when the metal strip is spirally wound to form the metal layer 5, the metal layer 5 is formed with an overlapping area 54; preferably, the winding overlap rate of the metal strip is 15% to 50% of the width of the metal strip. %, that is, the overlapping area 54 accounts for 15% to 50% of the width of the metal strip; the width of the overlapping area 54 is at least 0.8 mm, preferably at least 1 mm, so that it can be easily controlled to ensure the effectiveness of winding and avoid winding. Adjacent metal strips burst apart and separate from each other, thereby causing shield leakage. In addition, the winding angle of the metal strip relative to the width direction of the flat data transmission cable 100 is 40° to 55°, preferably 45° to 53°.

It should be understood that although this description is described according to implementation modes, not each implementation mode only includes an independent technical solution. The technical solutions in the embodiments can also be properly combined to form other embodiments that can be understood by those skilled in the art.

The series of detailed descriptions listed above are only specific descriptions of the feasible implementation modes of the present utility model, and they are not used to limit the protection scope of the present utility model. Embodiments or modifications should be included within the protection scope of the present utility model.

Claims (10)

1. a kind of flat data transmission cable, including several conducting wires arranged side by side, the conducting wire includes at least a pair of of difference letter Number line and ground line, it is characterised in that: each conducting wire be respectively provided with the conductor positioned at center position, coating conductor periphery the One clad, the second clad for coating the first clad periphery, the dielectric coefficient of first clad is lower than the second cladding The dielectric coefficient of layer；The data transmission cable further include the plastic layer for coating several conducting wires, using metal material belt in spiral shell Rotation is wound on the outside of the plastic layer and the metal layer of formation, the metal layer at least have aluminium foil layer and be set to aluminium foil Towards the adhesive layer of plastic layer side, the metal layer is adhesively fixed on the outside of the plastic layer layer after heating by the adhesive layer.

2. flat data transmission cable as described in claim 1, it is characterised in that: first clad is insulating wrapped Layer, second clad are to inhale wave layer.

3. flat data transmission cable as described in claim 1, it is characterised in that: the metal layer, which also has, is set to aluminium foil Layer deviates from the insulating layer of one side surface of plastic layer.

4. flat data transmission cable as claimed in claim 3, it is characterised in that: aluminium foil layer and insulating layer in the metal layer The sum of thickness be 0.010mm to 0.055mm.

5. flat data transmission cable as described in claim 1, it is characterised in that: the width of the metal material belt is line width 0.5 to 3 times.

6. flat data transmission cable as claimed in claim 5, it is characterised in that: the metal material belt in be spirally wound on modeling Overlay region is formed with when on the outside of glue-line, the winding Duplication of metal material belt is the 15% to 50% of the metal material belt width.

7. flat data transmission cable as claimed in claim 6, it is characterised in that: the width of the overlay region is at least 0.8mm。

8. flat data transmission cable as claimed in claim 7, it is characterised in that: the metal material belt compares the flat number Winding angle according to transmission cable width direction is 40 ° to 55 °.

9. flat data transmission cable as described in claim 1, it is characterised in that: the conductor of the flat data transmission cable The distance of outer rim to plastic layer outer rim is 0.1mm to 0.45mm.

10. flat data transmission cable as described in claim 1, it is characterised in that: the conductor diameter of aforementioned differential signal line Identical, the ratio between the center spacing of aforementioned differential signal line and the conductor diameter of differential signal line is 1.5 to 2.8.