CN215770671U - Cable with a flexible connection - Google Patents

Abstract

A cable (100) is provided, comprising: a pair of insulated core wires (110), the pair of insulated core wires (110) being arranged to extend longitudinally in parallel with each other, each of the insulated core wires (110) including a central conductor (111) and a core wire insulation layer (112) circumferentially wrapped around the central conductor (111); a first metal shielding layer (120), wherein the first metal shielding layer (120) is wrapped outside the pair of insulated core wires; a second metallic shielding layer (130), the second metallic shielding layer (130) wrapping outside the first metallic shielding layer; and the outer insulating layer (140), the said outer insulating layer (140) wraps up on the perimeteric surface of the said second metal shielding layer (130).

Description

Cable with a flexible connection

Technical Field

Embodiments of the present disclosure relate generally to cables and, more particularly, to a cable, such as a twinaxial cable, that is capable of data transmission at high data transmission rates.

Background

The structure of a conventional high-speed data transmission cable mainly comprises a pair of insulating core wires, a ground wire positioned between the insulating core wires, a metal shielding layer wrapping the insulating core wires and the ground wire, and an insulating layer wrapping the outside of the metal shielding layer. However, the high-frequency test bandwidth which can be realized by the conventional structure is low, and the structure is unstable due to the fact that only one insulating layer is used for fixing the core wire, so that the high-frequency performance is unstable; in addition, in the bending use process, the insulated core wire is easy to shift, the performance stability is poor, the ground wire is easy to dislocate, only one metal shielding layer is easy to break in the bending process, the high-frequency performance is poor, and the electromagnetic shielding effect of one metal shielding layer is poor.

SUMMERY OF THE UTILITY MODEL

The present disclosure is directed to overcoming at least one of the above-mentioned and other problems and disadvantages of the prior art.

According to an aspect of the present disclosure, there is provided a cable comprising: a pair of insulated core wires arranged to extend longitudinally in parallel with each other, each of the insulated core wires including a center conductor and a core insulating layer circumferentially wrapped around the center conductor; a first metal shielding layer wrapping the outside of the pair of insulated cores; the second metal shielding layer wraps the outside of the first metal shielding layer; and the outer insulating layer wraps the outer peripheral surface of the second metal shielding layer.

In some embodiments, the cable further comprises a ground wire disposed between the first metallic shield layer and the second metallic shield layer to be pressed against the outer circumferential surface of the first metallic shield layer by the second metallic shield layer.

In some embodiments, the cable comprises two said ground wires respectively located on diametrically opposite outer sides of said pair of insulated core wires.

In some embodiments, the cable includes a single said ground wire on a side of the core insulation layer of one of the pair of insulated cores facing away from the other insulated core in the radial direction.

In some embodiments, the center of the center conductor of the pair of insulated core wires and the center of the ground wire are located in the same radial plane.

In some embodiments, the cable comprises a single said ground wire located between the centres of said central conductors in a direction parallel to a line joining the centres of the central conductors of said pair of insulated core wires.

In some embodiments, at least one of the second metallic shield layer and the first metallic shield layer serves as a ground line adapted to be electrically connected to an external ground.

In some embodiments, the second metallic shield layer is directly wrapped around the outer circumferential surface of the first metallic shield layer, and the cable is not provided with a separate ground wire.

In some embodiments, the cable further includes an inner insulating layer wrapped outside the core insulating layers of the pair of insulated core wires to fix the pair of insulated core wires such that the core insulating layers of the pair of insulated core wires abut against each other at outer peripheries of sides facing each other,

in some embodiments, the cable is a cable adapted for data transmission at rates of 20Gbps to 40 Gbps.

Drawings

The foregoing and other aspects, features, and advantages of various embodiments of the present disclosure will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings in which:

fig. 1 is a radial cross-sectional schematic view schematically illustrating the structure of a cable according to an exemplary embodiment of the present disclosure;

fig. 2 is a radial cross-sectional schematic view schematically illustrating the structure of a cable according to another exemplary embodiment of the present disclosure;

fig. 3 is a radial cross-sectional schematic view schematically illustrating the structure of a cable according to yet another exemplary embodiment of the present disclosure;

fig. 4 is a radial cross-sectional schematic view schematically illustrating the structure of a cable according to still another exemplary embodiment of the present disclosure; and

fig. 5A to 5D are radial cross-sectional views schematically illustrating structures of cables according to various exemplary embodiments of the present disclosure, respectively.

Detailed Description

Embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. In the present specification, the same or similar components are denoted by the same or similar reference numerals. The following description of the embodiments of the present disclosure with reference to the accompanying drawings is intended to illustrate the general concept of the present disclosure, and should not be construed as limiting the present disclosure.

Furthermore, in the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the disclosure. It may be evident, however, that one or more embodiments may be practiced without these specific details. In other instances, well-known structures and devices are shown in schematic form in order to simplify the drawing.

As shown in fig. 1, a cable 100, such as a twin-axial or differential cable, for enabling stable data transmission at high transmission rates, such as speeds above 10Gbps, e.g., in the range of 20Gbps to 40Gbps, is provided according to an exemplary embodiment of the present disclosure.

As shown, a cable 100 according to an embodiment of the present disclosure includes a pair of insulated cores 110 for signal or data transmission. The pair of insulated core wires 110 are arranged to extend parallel to and longitudinally of each other, each of the insulated core wires 110 includes a central conductor 111 and a core wire insulating layer 112 circumferentially wrapped around the central conductor 111, and the core wire insulating layer 112 may be in the form of an insulating tape, for example, wound around the central conductor 111 in the longitudinal direction. The center conductor may be made of a high conductivity material such as a copper conductor, silver plated wire, or the like, and the core insulation layer may be made of an insulating polymer material such as polyolefin.

As shown, the cable 100 according to the embodiment of the present disclosure further includes a metal shielding layer for shielding signals or data transmitted in the insulated core from external electromagnetic interference, and an outer insulating layer 140. In the embodiment of the present disclosure, the cable includes two layers of shielding, i.e., a first metal shielding layer 120 and a second metal shielding layer 130, which are sequentially arranged from inside to outside, the first metal shielding layer 120 is circumferentially wrapped around the outside of the pair of insulated cores 110 to provide an electromagnetic shielding effect, and the second metal shielding layer 130 is circumferentially wrapped around the outside of the first metal shielding layer 120 to provide an improved electromagnetic shielding effect. The outer insulating layer 140 is circumferentially wrapped on the outer circumferential surface of the second metallic shield layer 130. From this, be provided with the cable of two-layer shielding layer have better and more stable bandwidth performance, have better high frequency and resist bending performance and better electromagnetic shield effect.

In addition, in the case that the first metal shielding layer and the second metal shielding layer have seams, the seams of the first metal shielding layer and the seams of the second metal shielding layer are located at different angular positions relative to the same core wire, so that the seams of the first metal shielding layer and the second metal shielding layer are staggered or not overlapped in the radial direction, and therefore, even if the respective seams of the first metal shielding layer and the second metal shielding layer have the condition that the distance between the respective seams of the first metal shielding layer and the second metal shielding layer is increased or staggered, the combination of the first metal shielding layer and the second metal shielding layer can still provide complete electromagnetic shielding effect during bending use.

For example, the first metallic shield layer 120 may be in the form of a shield tape wound around the outside of the insulated core wire 110 in the longitudinal direction. The second metallic shield layer 130 may also be in the form of a shield tape wound outside the first metallic shield layer 120 in the longitudinal direction. Exemplarily, the second metallic shielding layer may include a conductive layer partially bonded to the outer circumferential surface of the first metallic shielding layer via an adhesive, or a filler may be present between the conductive layer and the first metallic shielding layer, which may further improve the stability of the cable. As an example, the conductive layer of the metallic shielding layer is made of aluminum or copper, which may be an aluminum/polypropylene tape, for example. However, it should be noted that in some other embodiments of the present disclosure, the conductive layer of the metal shielding layer may be made of other conductive materials.

The outer insulating layer 140 is wrapped on the outer circumferential surface of the second metal shielding layer 130. The outer insulating layer may also be in the form of an insulating tape, wound outside the metallic shield layer in the longitudinal direction. The outer insulating layer may be bonded on the outer peripheral surface of the metal shield layer by a hot-melt method or by an adhesive. The outer insulating layer may be made of an insulating material such as polyester, polypropylene, polyethylene terephthalate (abbreviated as "PET"). In some examples, the outer insulation layer may be formed by stacking a plurality of sub-insulation layers to enhance the toughness of the cable when used in a bent state.

In some embodiments, as shown in fig. 1-3, the cable 100 further comprises a ground wire 150, for example, disposed between the first metallic shield layer 120 and the second metallic shield layer 130, to be pressed by the second metallic shield layer 130 against the outer circumferential surface of the first metallic shield layer 120. As an example, the ground wire 150 may be in electrical contact with at least one of the first and second metallic shield layers 120 and 130 or a conductive layer thereof.

Fig. 1 and 2 illustrate a case where the ground wire 150 is located on the radially outer side or the side of the pair of insulated core wires 110. In the embodiment illustrated in fig. 1, the cable may include two ground wires 150 respectively located on diametrically opposite outer sides of the pair of insulated core wires 110. In the embodiment illustrated in fig. 2, the cable may include a single ground wire 150 located outside one of the pair of insulated core wires 110 in a radial direction away from the other insulated core wire. Illustratively, the center of the center conductor 111 of the pair of insulated core wires 110 and the center of the ground wire 150 may be located in the same radial plane, with the center of the ground wire 150 being located radially outward of the centers of the center conductors 111 of the pair of insulated core wires 110.

In the embodiment illustrated in fig. 3, the cable comprises a single ground wire 150 which is located between the centers of the two central conductors 111 of a pair of insulated core wires 110 in a first direction parallel to the line connecting the centers of the central conductors 111 of the pair of insulated core wires 110, e.g. centered with respect to the centers of the two central conductors 111 of the pair of insulated core wires 110 in the first direction. The single ground wire 150 in fig. 3 is located on the same side of both insulated core wires 110. It will be appreciated that in other embodiments, in addition to the ground wire 150 in fig. 3, another ground wire may be provided on the opposite side of the two insulated cores, i.e. the cable may comprise two ground wires on opposite sides of the two insulated cores, respectively, in a second direction perpendicular to the first direction.

In some embodiments of the present disclosure, at least one of the second metal shield layer 130 and the first metal shield layer 120 may serve as a ground line adapted to be electrically connected to an external ground. For example, as shown in fig. 4, the cable is not provided with a separate ground wire, and the second metal shielding layer 130 or the first metal shielding layer 120 may double as a ground wire, whereby a cable having a more regular outer profile may be provided. As an example, the second metallic shield layer may be directly wrapped on the outer circumferential surface of the first metallic shield layer, or there may be an adhesive or a filler between the second metallic shield layer and the first metallic shield layer.

In some embodiments of the present disclosure, the cable may further include an inner insulating layer 160 wrapped outside the core insulating layers 112 of the pair of insulated cores 110, such as partially wrapped on outer circumferential surfaces of the core insulating layers 112, to fix the pair of insulated cores 110 such that outer circumferences of sides of the core insulating layers 112 of the pair of insulated cores 110 facing or approaching each other abut against each other. As shown, the first metallic shield layer 120 is wrapped outside the inner insulating layer 160, such as longitudinally on the outer circumferential surface of the inner insulating layer 160. Compared with the conventional cable, the additional inner insulating layer is arranged between the metal shielding layer and the insulating core wire to fix the insulating core wire, so that the insulating core wire can not be displaced in use, such as in bending use, and the performance stability of the cable is improved.

For example, the inner insulating layer 160 may be in the form of an insulating tape wound outside the core insulating layers 112 of the pair of insulated cores 110 in the longitudinal direction. Illustratively, the inner insulating layer may be bonded to a part of the outer peripheral surface of the core insulating layer of the pair of insulated cores, for example, by hot-melting. In other examples, the inner insulating layer may be bonded on part of the outer peripheral surface of the core insulating layer of the pair of insulated cores, for example, by an adhesive. The inner insulating layer is made of an insulating polymer material. For example, the inner insulating layer may be made of an insulating material such as Polytetrafluoroethylene (PTFE), polyethylene terephthalate (abbreviated as "PET").

In some examples, a filler may be provided in the space between the core insulation layer 112 and the inner insulation layer 160 of the pair of insulated cores 110, so that the flexibility of the cable in bending use may be provided, and the displacement of the insulated cores in use may be further avoided.

The presence of the inner insulating layer can prevent the metal shield layer from entering into the gap between the insulated core wires. For example, the first metal shield layer may be bonded on the outer peripheral surface of the internal insulation layer by a hot-melt method or by an adhesive. Exemplarily, the first metallic shielding layer may comprise a conductive layer which is bonded to the inner insulating layer via an adhesive, or there may be a filler between the conductive layer and the inner insulating layer, which may further improve the robustness of the cable. It will be understood that the inner insulating layer is optional, not necessary. For example, in some embodiments, as shown in fig. 5A-5D, without providing such an inner insulating layer, the first metallic shield layer 120 may be wrapped outside the core insulating layer.

Although in the illustrated embodiment the various layers/wires of the cable are shown as being spaced apart or having gaps therebetween, this is merely for clarity of illustration of the various layers/wires, in fact the various layers/wires of the cable are at least partially in close proximity or bonded, or with a suitable filler or adhesive therebetween.

Although embodiments of the present disclosure have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the disclosure, the scope of which is defined in the claims and their equivalents. It should also be noted that the terms "comprising," "including," and "having," as used herein, do not exclude other elements or steps, unless otherwise indicated. Additionally, any element numbers of the claims should not be construed as limiting the scope of the disclosure.

Claims (9)

1. A cable (100), characterized in that it comprises:

a pair of insulated core wires (110), the pair of insulated core wires (110) being arranged to extend longitudinally in parallel with each other, each of the insulated core wires (110) including a central conductor (111) and a core wire insulation layer (112) circumferentially wrapped around the central conductor (111);

a first metal shielding layer (120), wherein the first metal shielding layer (120) is wrapped outside the pair of insulated core wires;

a second metallic shielding layer (130), the second metallic shielding layer (130) wrapping outside the first metallic shielding layer;

an outer insulating layer (140), wherein the outer insulating layer (140) wraps the outer peripheral surface of the second metal shielding layer (130); and

and a ground wire (150) disposed between the first metal shield layer (120) and the second metal shield layer (130) to be pressed against an outer circumferential surface of the first metal shield layer by the second metal shield layer.

2. A cable according to claim 1, characterized in that it comprises two said earth wires (150) respectively located on diametrically opposite outer sides of said pair of insulated cores (110).

3. A cable according to claim 1, characterized in that it comprises a single said earth wire (150) on the side of the core insulation (112) of one of said pair of insulated cores (110) facing away from the other insulated core in the radial direction.

4. A cable according to claim 2 or 3, wherein the centre of the centre conductor (111) of the pair of insulated core wires (110) lies in the same radial plane as the centre of the earth wire.

5. A cable according to claim 1, characterized in that it comprises a single said earth wire (150) located between the centres of said central conductors (111) of said pair of insulated cores (110) in a direction parallel to the line connecting the centres of said central conductors (111).

6. The cable of claim 1, wherein at least one of the second metallic shield layer and the first metallic shield layer serves as a ground wire adapted to be electrically connected to an external ground.

7. A cable according to claim 6, wherein the second metallic shield layer is directly wrapped around the outer circumferential surface of the first metallic shield layer and wherein the cable is not provided with a separate ground wire.

8. The cable according to any one of claims 1-3 and 5-7, further comprising:

an inner insulating layer (160), the inner insulating layer (160) wrapping outside the core insulating layers (112) of the pair of insulated cores (110) to fix the pair of insulated cores (110) such that the outer circumferences of the core insulating layers (112) of the pair of insulated cores (110) on sides facing each other abut against each other,

the first metal shielding layer is wrapped on the peripheral surface of the inner insulating layer.

9. A cable according to any one of claims 1-3 and 5-7, characterized in that it is a cable adapted for data transmission at a rate of 20Gbps to 40 Gbps.

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