Deflection-resistant high-speed data transmission cable

Abstract

The invention relates to the technical field of high-speed data transmission cables, in particular to a deflection-resistant high-speed data transmission cable which comprises a plurality of signal transmission units and a shielding and fixing composite layer used for wrapping and fixing the signal transmission units, and the shielding and fixing composite layer comprises a base material layer and a metal shielding layer. The metal shielding layer has a nanometer wave-shaped surface appearance; according to the invention, the generation and expansion of cracks can be obviously inhibited while the electrical performance is maintained, the shear stress generated in the dynamic bending process is effectively resisted, and the structural integrity is still reliable after long-term bending use.

Description

Technical Field

[0001] This invention relates to the field of high-speed data transmission cable technology, and in particular to a flexural high-speed data transmission cable. Background Technology

[0002] With the rapid development of information technology, the requirements for data transmission rate and reliability are becoming increasingly stringent. High-speed data transmission cables, as key channels for signal interconnection within and between electronic devices, directly determine the overall performance of the system. However, in emerging application scenarios such as foldable mobile terminals, wearable devices, and industrial robot joint harnesses, cables not only need excellent electrical performance but must also withstand long-term, high-frequency, and small-radius dynamic bending. Traditional methods for improving cable flexibility, such as thinning the structural dimensions or using softer materials, often compromise the cable's mechanical strength and dimensional stability, negatively impacting its carefully designed electromagnetic field confinement structure. This leads to signal integrity degradation, increased crosstalk, and impedance mismatch, necessitating a high-speed data transmission cable capable of withstanding bending without sacrificing electrical performance. Summary of the Invention

[0003] The purpose of this invention is to provide a flexural high-speed data transmission cable that addresses the shortcomings of existing technologies. This cable can significantly suppress the initiation and propagation of cracks while maintaining electrical performance, effectively resist shear stress generated during dynamic bending, and ensure that the structural integrity remains reliable after long-term flexural use.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is: a flexural high-speed data transmission cable, comprising a plurality of signal transmission units and a shielding and fixing composite layer for wrapping and fixing each signal transmission unit, wherein the shielding and fixing composite layer comprises a substrate layer and a metal shielding layer, and the metal shielding layer has a nano-wave-shaped surface morphology.

[0005] A further improvement to the above scheme is that the nano-wave-shaped surface morphology of the metal shielding layer is composed of a periodic corrugated structure with a period of 50-200nm and an amplitude of 10-50nm.

[0006] A further improvement to the above scheme is that the shielding and fixing composite layer is a rigid shielding shell, the rigid shielding shell is provided with an installation cavity, and the installation cavity is provided with a number of shielding walls arranged side by side at intervals. The installation cavity is divided into multiple closed shielding cavities by the shielding walls, and each signal transmission unit is respectively arranged in each closed shielding cavity.

[0007] A further improvement to the above scheme is that the rigid shielding shell includes an upper shielding shell and a lower shielding shell. The bottom of the upper shielding shell is recessed upwards with an upper mounting groove, and the upper mounting groove has several upper partition walls arranged side by side at intervals. The upper mounting groove is divided by the upper partition walls to form multiple upper shielding grooves. The top of the lower shielding shell is recessed downwards with a lower mounting groove, and the lower mounting groove has several lower partition walls arranged side by side at intervals. The lower mounting groove is divided by the lower partition walls to form multiple lower shielding grooves. When the upper shielding shell and the lower shielding shell are connected to form a rigid shielding shell, the upper mounting groove of the upper shielding shell and the lower mounting groove of the lower shielding shell surround each other to form a mounting cavity. Each upper partition wall of the upper shielding shell is connected to each lower partition wall of the lower shielding shell to form a shielding wall. Each upper shielding groove of the upper shielding shell and each lower shielding groove of the lower shielding shell surround each closed shielding cavity.

[0008] A further improvement to the above scheme is that the upper shielding shell includes an upper shell body, and the upper shell body is provided with an upper continuous conductive shielding layer on the surface of each upper partition wall and each upper shielding groove; the lower shielding shell includes a lower shell body, and the lower shell body is provided with a lower continuous conductive shielding layer on the surface of each lower partition wall and each lower shielding groove; when the upper shielding shell and the lower shielding shell are connected to form a rigid shielding shell, the upper continuous conductive shielding layer and the lower continuous conductive shielding layer are electrically connected.

[0009] A further improvement to the above scheme is that the gaps between each of the enclosed shielding cavities and the corresponding signal transmission units are respectively filled with a fixed medium.

[0010] A further improvement to the above solution is that the fixing medium is highly elastic silicone.

[0011] A further improvement to the above scheme is that each of the upper partition walls and each of the lower partition walls has a micron-sized wavy surface morphology.

[0012] A further improvement to the above scheme is that the micron-wave-shaped surface morphology of each of the upper partition walls and each of the lower partition walls is composed of a periodic corrugated structure with a period of 500-1000μm and an amplitude of 50-200μm.

[0013] A further improvement to the above scheme is that the amplitudes of the micron-wave-shaped surface morphologies of each of the upper partition walls exhibit a gradient change, with the amplitude of the micron-wave-shaped surface morphology of the upper partition wall located at the edge region of the cable width direction being greater than the amplitude of the micron-wave-shaped surface morphology of the upper partition wall located at the center region of the cable width direction; similarly, the amplitudes of the micron-wave-shaped surface morphologies of each of the lower partition walls exhibit a gradient change, with the amplitude of the micron-wave-shaped surface morphology of the lower partition wall located at the edge region of the cable width direction being greater than the amplitude of the micron-wave-shaped surface morphology of the lower partition wall located at the center region of the cable width direction.

[0014] The beneficial effects of the present invention are as follows: The present invention provides a flexural high-speed data transmission cable, which includes a plurality of signal transmission units and a shielding and fixing composite layer for wrapping and fixing each signal transmission unit. The shielding and fixing composite layer includes a substrate layer and a metal shielding layer, wherein the metal shielding layer has a nano-wave-shaped surface morphology. The nano-wave-shaped surface morphology of the metal shielding layer of this invention can act as a microscopic, distributed elastic deformation unit when the cable is subjected to bending stress. This structure allows the metal shielding layer to undergo small, reversible adjustments in amplitude when the substrate layer deforms, thereby adapting to the stretching or compression of the substrate. This effectively avoids stress concentration and premature fatigue cracking caused by the rigid following of the substrate layer deformation in traditional flat and dense metal films. The nanoscale corrugated structure can also force the potential microcrack propagation path to deflect, consuming more fracture energy. Thus, it can significantly suppress the initiation and propagation of cracks while maintaining electrical performance. The nano-wave-shaped structure also essentially increases the effective contact area between the metal shielding layer and the substrate layer and forms a unique mechanical interlocking effect, which greatly improves the interfacial bonding strength and adhesion between the metal shielding layer and the substrate layer. It can effectively resist the shear stress generated during dynamic bending, fundamentally reducing the risk of interfacial delamination and peeling, thereby ensuring that the structural integrity remains reliable after long-term flexural use. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the present invention.

[0016] Figure 2 for Figure 1 Enlarged view of point A in the middle.

[0017] Explanation of reference numerals in the attached drawings: 1. Signal transmission unit; 2. Rigid shielding shell; 3. Mounting cavity; 31. Upper mounting groove; 32. Lower mounting groove; 4. Shielding wall; 41. Upper partition wall; 42. Lower partition wall; 5. Enclosed shielding cavity; 5. Upper shielding groove; 51. Lower shielding groove; 52. Upper shielding shell; 6. Upper shell body; 61. Upper continuous conductive shielding layer; 62. Lower shielding shell; 7. Lower shell body; 71. Lower continuous conductive shielding layer; 72. Fixing medium; 8. Shielding fixing composite layer; 9. Substrate layer; 91. Metal shielding layer; 92. Nanoscale wavy surface morphology; 10. Micrometer wavy surface morphology; 11. Detailed Implementation

[0018] The invention will now be further described with reference to the accompanying drawings, such as... Figure 1-2As shown, the present invention includes several signal transmission units 1 and a shielding and fixing composite layer 9 for wrapping and fixing each signal transmission unit 1. The shielding and fixing composite layer 9 includes a substrate layer 91 and a metal shielding layer 92. The metal shielding layer 92 has a nano-wave-shaped surface morphology 10. The nano-wave-shaped surface morphology 10 of the metal shielding layer 92 of the present invention can act as a microscopic, distributed elastic deformation unit when the cable is subjected to bending stress. This structure allows the metal shielding layer 92 to undergo small, reversible adjustments in amplitude when the substrate layer 91 deforms, thereby adapting to the stretching or compression of the substrate and effectively avoiding the rigid following of the substrate layer 9 by traditional flat and dense metal films. The stress concentration and premature fatigue cracking caused by deformation can be mitigated by the nanoscale corrugated structure, which can also force the potential microcrack propagation path to deflect and consume more fracture energy. This can significantly inhibit the initiation and propagation of cracks while maintaining electrical performance. The nano-wave-shaped structure also increases the effective contact area between the metal shielding layer 92 and the substrate layer 91 and forms a unique mechanical interlocking effect, which greatly improves the interfacial bonding strength and adhesion between the metal shielding layer 92 and the substrate layer 91. It can effectively resist the shear stress generated during dynamic bending and fundamentally reduce the risk of interface delamination and peeling, thereby ensuring that the structural integrity remains reliable after long-term flexural use.

[0019] The nano-wave-shaped surface morphology 10 of the metal shielding layer 92 is preferably composed of a periodic corrugated structure with a period of 50-200 nm and an amplitude of 10-50 nm. This not only ensures that the signal remains in a "quasi-smooth" state for signals up to tens of GHz or even higher frequencies, and the interference to electromagnetic wave reflection and transmission is negligible, but also provides sufficiently dense and effective micro-elastic deformation units mechanically. The nano-wave-shaped surface morphology 10 of the present invention can be formed by adding specific surfactants and polymer micelles to the electroplating solution and by controlling the current waveform, such as by using pulsed reverse current and hydrodynamics, so that the deposition rate of copper ions changes periodically, thereby forming a corrugated copper grain accumulation with a period of 50-200 nm and an amplitude of 10-50 nm.

[0020] The shielding and fixing composite layer 9 is a rigid shielding shell 2. The rigid shielding shell 2 has an installation cavity 3, and the installation cavity 3 has several shielding walls 4 arranged side-by-side and spaced apart. The installation cavity 3 is divided by the shielding walls 4 to form multiple closed shielding cavities 5. Each signal transmission unit 1 is respectively installed in each closed shielding cavity 5. Compared with the existing traditional film-kneading structure, this invention, through the pre-formed rigid shielding shell 2, allows key electromagnetic dimensions such as the width and height of each closed shielding cavity 5 and the width and height of each shielding wall 4 to be precisely defined during the mold manufacturing stage. This results in sub-micron level repeatability and unparalleled consistency in the length direction of the cable during mass production. The better structural consistency and precision ensure the extreme uniformity of key parameters such as characteristic impedance and propagation delay. Since existing traditional cables rely on the physical contact between the upper and lower shielding films in the kneading area to achieve isolation between conductor pairs, resulting in unstable contact resistance, the construction of this invention... The invention features an independent, rigid, enclosed shielding cavity 5, where each signal transmission unit 1 is surrounded by a separate, complete metal cavity, forming a near-perfect "Faraday cage." This eliminates the problem of unstable contact resistance and improves shielding integrity and stability. Compared to existing traditional cables where the "kneading zone" must maintain a relatively wide size (usually greater than 200μm) to ensure film bonding strength and inter-pair isolation, which fundamentally restricts the reduction of the center distance between signal transmission units 1, this invention replaces the "kneading zone" with a rigid shielding wall 4. The width of the shielding wall 4 in this invention is 30-100μm. This rigid structure significantly reduces the space occupied by non-functional areas while ensuring mechanical strength and electrical isolation. Combined with a more compact cavity design, the center distance between adjacent signal transmission units 1 can be significantly reduced, enabling 20%-30% more transmission channels to be accommodated than existing technologies with the same cable width, and achieving an ultra-high conductor density layout.

[0021] The rigid shielding shell 2 includes an upper shielding shell 6 and a lower shielding shell 7. The bottom of the upper shielding shell 6 is recessed with an upper mounting groove 31, and the upper mounting groove 31 has several upper partition walls 41 arranged side by side at intervals. The upper mounting groove 31 is divided by the upper partition walls 41 to form multiple upper shielding grooves 51. The top of the lower shielding shell 7 is recessed with a lower mounting groove 32, and the lower mounting groove 32 has several lower partition walls 42 arranged side by side at intervals. The lower mounting groove 32 is divided by the lower partition walls 42 to form multiple lower shielding grooves 52. When the upper shielding shell 6 and the lower shielding shell 7 are connected to form the rigid shielding shell 2, the upper mounting groove 31 of the upper shielding shell 6 and the lower mounting groove 7 are recessed with each other. The mounting grooves 32 surround to form the mounting cavity 3. Each upper partition wall 41 of the upper shielding shell 6 is connected to each lower partition wall 42 of the lower shielding shell 7 to form a shielding wall 4. Each upper shielding groove 51 of the upper shielding shell 6 is connected to each lower shielding groove 52 of the lower shielding shell 7 to form a closed shielding cavity 5. By manufacturing the rigid shielding shell 2 by splitting it into two half shells, the upper shielding shell 6 and the lower shielding shell 7, and then joining them by hot pressing, laser welding, or adhesive, not only is the processing difficulty and cost of precision molds greatly reduced, but the assembly method of docking also facilitates the placement of the signal transmission unit 1 and the filling of the fixing medium 8 before docking and packaging.

[0022] The upper shielding shell 6 includes an upper shell body 61, on which an upper continuous conductive shielding layer 62 is provided on the surface of each upper partition wall 41 and each upper shielding groove 51. The lower shielding shell 7 includes a lower shell body 71, on which a lower continuous conductive shielding layer 72 is provided on the surface of each lower partition wall 42 and each lower shielding groove 52. When the upper shielding shell 6 and the lower shielding shell 7 are connected to form a rigid shielding shell 2, the upper continuous conductive shielding layer 62 and the lower continuous conductive shielding layer 72 are electrically connected, which can better ensure that the inner wall of each closed shielding cavity 5 forms a seamless and continuous conductive surface, thereby providing extremely stable and uniform shielding performance. The shielding fixing composite layer 9 of the present invention is a rigid shielding shell 2, the upper shell body 61 and the lower shell body 71 are the substrate layer 91, and the upper continuous conductive shielding layer 62 and the lower continuous conductive shielding layer 72 are the metal shielding layer 92.

[0023] Each of the enclosed shielding cavities 5 and the corresponding signal transmission unit 1 is filled with a fixing medium 8. By filling the gaps between the enclosed shielding cavity 5 and the corresponding signal transmission unit 1 with the fixing medium 8, any possibility of slight movement of the signal transmission unit 1 within the enclosed shielding cavity 5 can be further eliminated, thereby further ensuring the absolute consistency of impedance along the length. The fixing medium 8 is preferably highly elastic silicone, which can better uniformly transmit and buffer the stress acting on the signal transmission unit 1 when bending, avoiding local stress concentration that could damage the conductor.

[0024] Each of the upper partition walls 41 and each of the lower partition walls 42 has a micron-sized wavy surface morphology 11, which enables the originally rigid shielding wall 4 to have a controllable and wide-range elastic bending capability as a whole, actively absorbing and dissipating most of the bending strain energy, thereby significantly reducing the stress level transmitted to the internal signal transmission unit 1 and the metal shielding layer 92. It can form a graded energy dissipation mechanism in conjunction with the nano-wavy surface morphology 10 of the metal shielding layer 92, and can also increase the contact area between the shielding wall 4 and the filling fixed medium 8, further avoiding the possibility of interface peeling during dynamic bending.

[0025] The micron-wave-shaped surface morphology 11 of each of the upper partition walls 41 and each of the lower partition walls 42 is composed of a periodic corrugated structure with a period of 500-1000μm and an amplitude of 50-200μm.

[0026] The amplitudes of the micron-wave-shaped surface morphologies 11 of each of the upper partition walls 41 exhibit a gradient change, with the amplitude of the micron-wave-shaped surface morphology 11 of the upper partition wall 41 located at the edge region in the cable width direction being greater than the amplitude of the micron-wave-shaped surface morphology 11 of the upper partition wall 41 located at the center region in the cable width direction; similarly, the amplitudes of the micron-wave-shaped surface morphologies 11 of each of the lower partition walls 42 exhibit a gradient change, with the amplitude of the micron-wave-shaped surface morphology 11 of the lower partition wall 42 located at the edge region in the cable width direction being greater than the amplitude of the micron-wave-shaped surface morphology 11 of the lower partition wall 42 located at the center region in the cable width direction. The amplitude of the wavy surface morphology 11; when the flat cable is bent, the strain is greatest on the outer edge (tension side) and inner edge (compression side), while the strain in the central area is smaller. This invention uses gradient amplitude design to pre-set a larger deformation capacity, i.e. a larger wave amplitude, in the high strain area (i.e., the edge area in the cable width direction), so that these areas can accommodate higher strain through larger local elastic deformation, thereby promoting a more uniform strain distribution in the entire cable width direction, effectively preventing stress concentration and premature failure of the edge shielding wall 4 or interface, and improving the uniformity and reliability of the overall flexural life of the cable.

[0027] Of course, the above description is only a preferred embodiment of the present invention. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of this patent application are included in the scope of this patent application.

Claims

1. A flexurally resistant high-speed data transmission cable, characterized in that: It includes several signal transmission units (1) and a shielding and fixing composite layer (9) for wrapping and fixing each signal transmission unit (1). The shielding and fixing composite layer (9) includes a substrate layer (91) and a metal shielding layer (92). The metal shielding layer (92) has a nano-wave-shaped surface morphology (10).

2. The flexurally resistant high-speed data transmission cable according to claim 1, characterized in that: The nano-wave-shaped surface morphology (10) of the metal shielding layer (92) is composed of a periodic wave structure with a period of 50-200nm and an amplitude of 10-50nm.

3. A flexurally resistant high-speed data transmission cable according to claim 1 or 2, characterized in that: The shielding and fixing composite layer (9) is a rigid shielding shell (2). The rigid shielding shell (2) has an installation cavity (3). The installation cavity (3) has several shielding walls (4) arranged side by side and spaced apart. The installation cavity (3) is divided by each shielding wall (4) to form multiple closed shielding cavities (5). Each signal transmission unit (1) is respectively arranged in each closed shielding cavity (5).

4. The flexurally resistant high-speed data transmission cable according to claim 3, characterized in that: The rigid shielding shell (2) includes an upper shielding shell (6) and a lower shielding shell (7). The bottom of the upper shielding shell (6) is recessed upwards and provided with an upper mounting groove (31). The upper mounting groove (31) is provided with a plurality of upper partition walls (41) arranged side by side and spaced apart. The upper mounting groove (31) is divided into a plurality of upper shielding grooves (51) by the upper partition walls (41). The top of the lower shielding shell (7) is recessed downwards and provided with a lower mounting groove (32). The lower mounting groove (32) is provided with a plurality of lower partition walls (42) arranged side by side and spaced apart. The lower mounting groove (32) is divided by the lower partition walls (42). Multiple lower shielding grooves (52) are formed; when the upper shielding shell (6) and the lower shielding shell (7) are connected to form a rigid shielding shell (2), the upper mounting groove (31) of the upper shielding shell (6) and the lower mounting groove (32) of the lower shielding shell (7) surround each other to form a mounting cavity (3), each upper partition wall (41) of the upper shielding shell (6) is connected to each lower partition wall (42) of the lower shielding shell (7) to form each shielding wall (4), and each upper shielding groove (51) of the upper shielding shell (6) surrounds each lower shielding groove (52) of the lower shielding shell (7) to form each closed shielding cavity (5).

5. A flexurally resistant high-speed data transmission cable according to claim 4, characterized in that: The upper shielding shell (6) includes an upper shell body (61), and the upper shell body (61) is provided with an upper continuous conductive shielding layer (62) on the surface of each upper partition wall (41) and each upper shielding groove (51). The lower shielding shell (7) includes a lower shell body (71), and the lower shell body (71) is provided with a lower continuous conductive shielding layer (72) on the surface of each lower partition wall (42) and each lower shielding groove (52). When the upper shielding shell (6) and the lower shielding shell (7) are connected to form a rigid shielding shell (2), the upper continuous conductive shielding layer (62) and the lower continuous conductive shielding layer (72) are electrically connected.

6. A flexurally resistant high-speed data transmission cable according to claim 3, characterized in that: The gaps between each of the enclosed shielding cavities (5) and the corresponding signal transmission unit (1) are respectively filled with a fixed medium (8).

7. A flexurally resistant high-speed data transmission cable according to claim 6, characterized in that: The fixing medium (8) is highly elastic silicone.

8. A flexurally resistant high-speed data transmission cable according to claim 4, characterized in that: Each of the upper partition wall (41) and each of the lower partition walls (42) has a micron-wave-shaped surface morphology (11).

9. A flexurally resistant high-speed data transmission cable according to claim 8, characterized in that: The micron-wave-shaped surface morphology (11) of each of the upper partition walls (41) and each of the lower partition walls (42) is composed of a periodic corrugated structure with a period of 500-1000 μm and an amplitude of 50-200 μm.

10. A flexurally resistant high-speed data transmission cable according to claim 9, characterized in that: The amplitudes of the micron-wave-shaped surface morphology (11) of each of the upper partition walls (41) exhibit a gradient change, with the amplitude of the micron-wave-shaped surface morphology (11) of the upper partition wall (41) located at the edge region of the cable width direction being greater than the amplitude of the micron-wave-shaped surface morphology (11) of the upper partition wall (41) located at the center region of the cable width direction being greater than the amplitude of the micron-wave-shaped surface morphology (11) of the lower partition walls (42) exhibit a gradient change, with the amplitude of the micron-wave-shaped surface morphology (11) of the lower partition wall (42) located at the edge region of the cable width direction being greater than the amplitude of the micron-wave-shaped surface morphology (11) of the lower partition wall (42) located at the center region of the cable width direction being greater than the amplitude of the micron-wave-shaped surface morphology (11) of the lower partition wall (42) located at the center region of the cable width direction being greater than the amplitude of the micron-wave-shaped surface morphology (11) of the lower partition wall (42) located at the center region of the cable width direction being greater than the amplitude of the micron-wave-shaped surface morphology (11) of the lower partition wall (42) located at the center region of the cable width direction being greater than the amplitude of the micron-wave-shaped surface morphology (11) of the lower partition wall (42) located at the edge ... edge region of the cable width direction being greater than the amplitude

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