Highly shielded ethernet cable for vehicle, and manufacturing method thereof

Abstract

Disclosed is a highly shielded Ethernet cable for a vehicle. The highly shielded Ethernet cable for a vehicle according to an embodiment of the present invention comprises: a core unit formed by twisting a pair of cores with a predetermined pitch, the cores including insulators surrounding conductors; a tape layer formed by surrounding the outer circumference of the core unit with a tape in the direction opposite to a direction in which the pair of cores is twisted; a bedding layer formed to surround the tape layer; a shielding layer formed to surround the bedding layer; and a sheath layer formed to surround the shielding layer.

Description

[Technical Field]

[0001] The present disclosure relates to a highly shielded Ethernet cable for a vehicle and a manufacturing method thereof, and more specifically, to a highly shielded Ethernet cable for a vehicle and a manufacturing method thereof that can improve LCL / LCTL electrical characteristics.[Background Art]

[0002] Among communication cables that are most widely used in vehicles, Ethernet cables are generally applied to many applications. Further, the market for in-vehicle Ethernet is gradually expanding due to the development of autonomous driving and infotainment, and accordingly, the demand for Ethernet cables is significantly increasing. Here, infotainment refers to an integrated multimedia system in which information and entertainment are combined.

[0003] In accordance with this trend, applications that require in-vehicle data, such as autonomous driving and infotainment, are continuously developing, and their usage is increasing. However, currently deployed Ethernet cables face limitations in data rate and capacity, and thus cannot keep up with the development speed of applications. Therefore, the development of an alternative cable capable of transmitting and receiving more data is urgent.

[0004] Ethernet cables are broadly classified into Unshielded Twisted Pair (UTP) and Twisted Pair (STP), and since STP has better noise characteristics due to shielding compared to UTP, the development direction of high-performance Ethernet cables is focused on an STP structure.

[0005] Cables with the STP structure are broadly classified into two types, Class 1 and Class 2. Class 1 is characterized by lower shielding characteristics compared to Class 2 and requires LCL / LCTL (TCL / TCTL) parameters, whereas Class 2 requires higher shielding characteristics than Class 1 but does not require LCL / LCTL (TCL / TCTL) parameters.

[0006] Therefore, in order to overcome the limitations of currently deployed Ethernet cables, the development of a cable that can satisfy all parameters specified in Class 1 and Class 2 is required.[Disclosure][Technical Problem]

[0007] In order to solve the problems described above, an objective of the present disclosure is to provide a highly shielded Ethernet cable for a vehicle that is advantageous for high-speed and large-capacity data transmission because it has high shielding characteristics and satisfies certain levels of LCL / LCTL values, and a method of manufacturing the highly shielded Ethernet cable for a vehicle.

[0008] Objectives of the present disclosure are not limited to those described above and other objectives not stated herein can be clearly understood by those skilled in the art from the following description.[Technical Solution]

[0009] As a means for achieving the objectives described above, a highly shielded Ethernet cable for a vehicle according to an embodiment of the present disclosure includes: a core unit formed by twisting a pair of cores, which includes insulators surrounding conductors, at a predetermined pitch; a tape layer formed by wrapping a tape around an outer circumference of the core unit in a direction opposite to a twisting direction of the pair of cores; a bedding layer formed to surround the tape layer; a shielding layer formed to surround the bedding layer; and a sheath layer formed to surround the shielding layer.

[0010] The conductor may have a structure in which a plurality of conductor strands is arranged around a single central strand.

[0011] A width and a wrapping angle of the tape satisfy the following mathematical expression, 65 ⋅ e − 0.15 ⋅ a + 9 ≤ b ≤ 78 ⋅ e − 0.1 ⋅ a + 17 where a is the width of the tape and b is the wrapping angle of the tape.

[0012] The width of the tape is in a range of 5 mm to 20 mm, and the tape may be wrapped at an angle within a range calculated by the mathematical expression on the basis of a width of use, with respect to a central axis of the core unit.

[0013] The tape may be selected from a group of polymer-based tapes.

[0014] The predetermined pitch of the core unit formed by twisting a pair of cores together may be 7 mm to 50 mm.

[0015] The tape wrapped around the outer circumference of the core unit may be wound in an overlapping manner such that a width of the tape partially overlaps.

[0016] Meanwhile, a method of manufacturing a highly shielded Ethernet cable for a vehicle according to another embodiment of the present disclosure includes: forming a core unit by twisting a pair of cores, which includes conductors and insulators, at a predetermined pitch in one direction; forming a tape layer by wrapping a tape around an outer surface of the core unit in a direction opposite to the one direction; forming a bedding layer surrounding the tape layer; forming a shielding layer surrounding the bedding layer; and forming a sheath layer surrounding the shielding layer.

[0017] A width and a wrapping angle of the tape satisfy the following mathematical expression, 65 ⋅ e − 0.15 ⋅ a + 9 ≤ b ≤ 78 ⋅ e − 0.1 ⋅ a + 17 where a is the width of the tape and b is the wrapping angle of the tape.

[0018] The width of the tape is in a range of 5 mm to 20 mm, and the tape may be wrapped at an angle within a range calculated by the mathematical expression on the basis of a width of use, with respect to a central axis of the core unit.[Advantageous Effects]

[0019] According to the present disclosure, by forming a tape layer that surrounds cores constituting a cable, there is an effect of providing a highly shielded Ethernet cable for a vehicle that satisfies both high LCL / LCTL characteristics required in Class 1 and high shielding characteristics required in Class 2, and a method of manufacturing the highly shielded Ethernet cable.

[0020] Accordingly, there is an effect of providing a highly shielded Ethernet cable for a vehicle that can accommodate all applications that require large amounts of data transmission, such as autonomous driving and infotainment.

[0021] Effects of the present disclosure are not limited to those described above and other effects not stated herein can be clearly understood by those skilled in the art from the following description.[Description of Drawings]

[0022] FIG. 1 is a cross-sectional view of a highly shielded Ethernet cable for a vehicle according to an embodiment of the present disclosure, FIG. 2 is a perspective view showing a core and a tape layer of the highly shielded Ethernet cable for a vehicle according to an embodiment of the present disclosure, FIG. 3 is a conceptual diagram for describing a width and an angle of a tape forming the tape layer of the highly shielded Ethernet cable for a vehicle according to an embodiment of the present disclosure, FIG. 4 is a view for describing an incorrect example of forming a tape layer, FIG. 5 is a graph showing LCL / LCTL evaluation results according to a forming direction of a tape layer, FIGS. 6 and 8 are graphs showing LCL / LCTL evaluation results according to an angle of a tape forming a tape layer, and FIG. 9 is a flowchart for describing a method of manufacturing a highly shielded Ethernet cable for a vehicle according to an embodiment of the present disclosure. [Mode for Invention]

[0023] The aforementioned objectives, other objectives, features, and advantages of the present disclosure would be easily understood through the following exemplary embodiments related to the accompanying drawings. However, the present disclosure is not limited to the embodiments described herein and may be implemented in other ways. On the contrary, the embodiments disclosed herein are provided so that the disclosed contents can be made thorough and complete and the spirit of the present disclosure can be sufficiently conveyed to those skilled in the art.

[0024] In the specification, when it is mentioned that a certain component is on another component, it means that it may be directly formed on the other component or that a third component may be interposed therebetween. Further, in the drawings, the thicknesses of components may be exaggerated for effective description.

[0025] When terms such as first, second, etc. are used to describe components in the specification, the components should not be limited by the terms. These terms are used only to discriminate between some components from other components. The embodiments described and illustrated herein also include their complementary embodiments.

[0026] Further, when it is mentioned that a first element (or component) is operated or executed on a second element (or component), the first element (or component) should be understood to be operated or executed in an environment where the second element (or component) is operated or executed, or to be operated or executed through direct or indirect interaction with the second element (or component).

[0027] Further, the terms used in the specification are provided to describe embodiments without limiting the present disclosure. In the specification, a singular form includes a plural form unless specifically stated in the sentence. The terms "comprise" and / or "comprising" used in the specification do not exclude that another component exists or is added other than the stated component.

[0028] FIG. 1 is a cross-sectional view of a highly shielded Ethernet cable for a vehicle according to an embodiment of the present disclosure.

[0029] Referring to FIG. 1, a highly shielded Ethernet cable for a vehicle according to an embodiment of the present disclosure (hereinafter referred to as "Ethernet cable") includes a core unit 100, a tape layer 200, a bedding layer 300, a shielding layer 400, and a sheath layer 500.

[0030] The core unit 100 is formed by twisting a pair of cores 110 and 120 including insulators 114 and 124 surrounding conductors 112 and 122, respectively, at a predetermined pitch in one direction, that is, in any one direction of an S-lay or Z-lay direction. Here, the predetermined pitch at which the pair of cores 110 and 120 is twisted may be a value in the range of 7 mm to 50 mm.

[0031] The conductors 112 and 122 may be formed in a configuration in which a plurality of conductor strands is arranged around a single central strand. As shown in the figures, six conductor stands may be arranged around a single central strand. However, this is merely an embodiment, and around a single central strand, conductor strands may be arranged in N layers with 6N strands in the N-th layer; for example, 1+6 strands, 1+6+12 strands, and so on. Forming the conductors 112 and 122 in this configuration serves to maintain a stable shape of the conductors. Further, the conductors 112 and 122 may be made of a metallic material such as copper, aluminum, or silver, or an alloy thereof.

[0032] The insulators 114 and 124 are formed to surround the outer circumference of the conductors 112 and 122, and may be formed by extrusion of an insulating composition including a polymer resin having an electrical insulation property as a base resin. Here, the polymer resin is not particularly limited as long as it can achieve an electrical insulation property, and may include, for example, polyolefin-based resins such as polyethylene, ethylenevinyl acetate, ethylene-ethyl acetate, and ethylene-butyl acrylate.

[0033] The tape layer 200 is formed by wrapping a tape around the outer circumference of the core unit 100 in a direction opposite to the twisting direction of the pair of cores 110 and 120. An important aspect in forming the tape layer 200 is that the tape must be wrapped in a direction opposite to the direction of the stranded wire formed by the core unit 100. That is, when the stranded wire has a Z-lay, the tape must be wound in the S-lay direction, and when the stranded wire has an S-lay, the tape must be wrapped in the Z-lay direction. The reason why the direction of the tape must be opposite to the stranded wire will be described in more detail with reference to FIG. 4 and FIG. 5.

[0034] The bedding layer 300 is formed to surround the tape layer 200. In general Ethernet cables, the bedding layer 300 is disposed to fill the empty space between the core and the shielding layer, and by this structure, the concentricity of the Ethernet cables can be improved and the Ethernet cables can be structurally stabilized. In this embodiment, since the tape layer 200 surrounds core unit 100, the bedding layer 300 is disposed between the tape layer 200 and the shielding layer 400.

[0035] The bedding layer 300 may be made of resins such as polyvinyl chloride (PVC), polyethylene (PE), cross-linked polyethylene (XLPE), polypropylene (PP), and fluorinated ethylene-propylene (FEP). The bedding layer 200 using these resins increases the permittivity outside the core 100 and increases the physical distance between the core unit 100 and the shielding layer 400, thereby shifting the point at which attenuation distortion occurs to a higher frequency band than existing Ethernet cables by changing the overall effective permittivity and capacitance so that attenuation distortion does not occur within the required frequency band.

[0036] The shielding layer 400 is formed to surround the bedding layer 300. The shielding layer 400 performs a function of blocking electromagnetic waves emitted from the core unit 100 to the outside and electromagnetic waves attempting to penetrate into the Ethernet cable from the outside, thereby blocking them. The shielding layer 400 may include a first shielding layer 410 and a second shielding layer 420.

[0037] The first shielding layer 410 is formed to surround the bedding layer 300 in contact with the bedding layer 300, and an aluminum tape may be applied. For example, the first shielding layer 410 may be formed by an aluminum tape such as an aluminum-mylar (Al-mylar) tape in which an aluminum foil is attached to a polyester film.

[0038] The second shielding layer 420 is formed to surround the first shielding layer 410, and a metal braid may be applied. For example, the second shielding layer 420 may be formed by a metal braid such as a tin-plated copper braid.

[0039] The sheath layer 500 is formed to surround the shielding layer 400. The sheath layer 500 is formed to surround the shielding layer 400, that is, the second shielding layer 420, thereby forming the outermost portion of the Ethernet cable. The sheath layer 500 entirely surrounds the core unit 100 and performs a function of protecting the core unit 100 from external pressure or impact. For example, the sheath layer 500 may be made of a polyvinyl chloride resin, a polyethylene resin, a fluororesin, or the like, and may be formed by extrusion of a sheath composition including, as a base resin, a polyvinyl chloride resin having excellent flexibility.

[0040] FIG. 2 is a perspective view showing a core and a tape layer of the highly shielded Ethernet cable for a vehicle according to an embodiment of the present disclosure and FIG. 3 is a conceptual diagram for describing a width and an angle of a tape forming the tape layer of the highly shielded Ethernet cable for a vehicle according to an embodiment of the present disclosure.

[0041] As shown in FIG. 2, the conductors 112 and 122 composed of wires are twisted at a predetermined pitch, thereby forming the core unit 100. Thereafter, the tape layer 200 formed of a tape is formed over the core unit 100. The tape layer 200 is formed over the entire core unit 100 by winding a tape in a direction opposite to the twisting direction of the pair of cores 110 and 120.

[0042] In order to improve LCL / LCTL characteristics, the structure of the Ethernet cable must be uniform overall. However, in the case of a stranded wire, since the core unit 100 is twisted at a predetermined pitch, there is a problem in that extrusion of the material is difficult. In this case, when high pressure is applied to fully fill the material between the pair of cores 110 and 120, due to the pressure, the space between the cores may open or the pitch may become uneven.

[0043] In order to solve this problem, in the Ethernet cable according to the present disclosure, the core unit 100 is implemented by the tape layer 200 formed by winding a tape in a direction opposite to the direction of the stranded wire.

[0044] As described above, the tape layer 200 is formed by winding a tape in a direction opposite to the twisting direction of the pair of cores 110 and 120. In this case, the winding direction and the winding angle of the tape forming the tape layer 200 are schematically shown in FIG. 3.

[0045] The core unit 100 is formed by twisting cores at a predetermined pitch and then a tape is wound. In this case, the tape for forming the tape layer 200 has a predetermined width and is wound obliquely at a predetermined angle to wrap the core unit 100 composed of wires. The width of the tape may be selected in the range of 5 mm to 20 mm. In this case, when selecting the tape, the width of the tape should not exceed 20 mm, which is the maximum limit for ensuring a stable structure of the stranded body. Further, in the present disclosure, when a tape is generally wound, the tape is wrapped such that a portion of its width overlaps, and this winding is referred to as an overlapping manner. FIG. 3 shows the tape wound in this overlapping manner (the portion that overlaps and goes underneath is represented by a chain line).

[0046] When the tape forming the tape layer 200 is wrapped around the core unit 100, the width of the tape and the angle at which the tape is wrapped satisfy Mathematical expression 1. 65 ⋅ e − 0.15 ⋅ a + 9 ≤ b ≤ 78 ⋅ e − 0.1 ⋅ a + 17

[0047] In Mathematical expression 1, a is the width (mm) of the tape and b is the angle (deg) at which the tape is wrapped.

[0048] When a tape with a width of 8 mm is used, according to Mathematical expression 1, it is preferable that the tape is wrapped around the core unit 100 to form an angle of 29° to 52° with respect to the central axis of the core, which is perpendicular. Since the width and angle of the tape must satisfy Mathematical expression 1, if the tape width changes, the angle at which the tape is wound may also be changed.

[0049] FIG. 4 is a view for describing an incorrect example of forming a tape layer.

[0050] As described above, in the Ethernet cable according to the present disclosure, the tape layer 200 is formed in a direction opposite to the twisting direction of the pair of cores 110 and 120. That is, the twisting direction of the core unit 100 and the winding direction of the tape must be opposite to each other. The reason is to achieve the improvement effect of LCL / LCTL.

[0051] The situation in which the tape is wound in the same direction as the twisting direction of the pair of cores 110 and 120 is shown in FIG. 4. That is, the Ethernet cable was manufactured by forming the tape layer 200 in the same direction as the direction in which the core unit 100 is formed, and then sequentially forming the bedding layer 300, the shielding layer 400, and the sheath layer 500, and thereafter, the cross-section of the cable was actually observed. That is, FIG. 4 corresponds to the case in which both the stranded wire and the tape are formed in the S-lay direction or Z-lay direction.

[0052] As shown in the figure, when the tape layer 200 is formed on the core unit 100, if the formation direction of the tape layer 200 is the same as that of the pair of cores 110 and 120, it can be seen, as shown in (a) to (c), that the tape layer 200 is not uniformly formed.

[0053] That is, the tape partially penetrated into the groove between the cores of the stranded wire. More specifically, (a) shows that the tip of the tape was curled into the groove at the short-side end, and (b) and (c) show that grooves occurred on both sides or on one side due to tension.

[0054] As shown in (a) to (c), if the tape layer 200 is formed with a non-uniform structure, it adversely affects the LCL / LCTL characteristics. Therefore, when manufacturing the Ethernet cable according to the present disclosure, the tape layer 200 must be formed by winding a tape in a direction opposite to the direction in which the pair of cores 110, 120 is formed.

[0055] It was experimentally confirmed that when the tape layer 200 is formed by winding a tape in a direction opposite to the twisting direction of the pair of cores 110 and 120 and then the Ethernet cable is manufactured, the non-uniformity shown in (a) to (c) does not occur.

[0056] FIG. 5 is a graph showing LCL / LCTL evaluation results according to a forming direction of a tape layer.

[0057] In this embodiment, Ethernet cables were manufactured in two cases: when the twisting direction of the pair of cores 110 and 120 and the winding direction of the tape forming the tape layer 200 are the same, and when they are opposite, and then an LCL characteristic and an LCTL characteristic were observed for each case and plotted in graphs. The LCL / LCTL values should be lower than the specification values to exhibit good characteristics.

[0058] LCL refers to a phenomenon in which a common mode is converted into a differential mode due to an unbalanced structure such as core-to-core length and outer diameter, where attenuation and mode conversion simultaneously occur in sections causing reflected signals, which results in the signal returning to an input terminal (Return Loss). On the other hand, LCTL refers to a phenomenon in which the cause is similar to that of LCL, but the signal is directly output to the output terminal instead of returning to the input terminal (Insertion Loss).

[0059] LCL and LCTL are indicators for checking how symmetrical the cable structure is, and in order to suppress mode conversion, it is necessary to ensure a uniform (symmetry) structure throughout the cable. Further, a mode-converted signal is recognized as noise at a receiving terminal and may interfere with data transmission and reduce transmission efficiency; therefore, LCL / LCTL values must satisfy a certain level to be advantageous for high-speed and large-capacity data transmission.

[0060] (a) shows the evaluation results of a frequency-dependent LCL characteristic in a cable in which the pair of cores 110 and 120 and the tape layer 200 are formed in the same direction and in an Ethernet cable according to the present disclosure, together with a published LCL specification.

[0061] (a) shows the evaluation results of a frequency-dependent LCTL characteristic in a cable in which the pair of cores 110 and 120 and the tape layer 200 are formed in the same direction and in an Ethernet cable according to the present disclosure, together with a published LCTL specification.

[0062] Referring to (a) and (b), it can be seen that the Ethernet cable according to the present disclosure exhibits improved LCL / LCTL characteristics compared with the cable in which the pair of cores 110 and 120 and the tape layer 200 are formed in the same direction, and also satisfies the LCL / LCTL characteristics required for Class 1.

[0063] FIGS. 6 and 8 are graphs showing LCL / LCTL evaluation results according to an angle of a tape forming a tape layer.

[0064] As mentioned in the previous embodiment, in manufacturing the Ethernet cable according to the present disclosure, the tape wrapping the core unit 100 satisfies Mathematical expression 1 in terms of its width and wrapping angle. Accordingly, in this embodiment, to compare when the width and angle of the tape satisfy Mathematical expression 1 and when they do not, the wrapping angle of the tape was varied, and the LCL and LCTL characteristics were observed. In this case, the width a of the tape was applied uniformly as 8 mm.

[0065] In FIG. 6, after setting the tape angle b to 15° and manufacturing the cable, the LCL and LCTL characteristics were shown in a graph. In FIG. 7, after setting the tape angle b to 40° and manufacturing the cable, the LCL and LCTL characteristics were shown in a graph. Further, in FIG. 8, after setting the tape angle b to 60° and manufacturing the cable, the LCL and LCTL characteristics were shown in a graph. In FIGS. 6 to 8, the graphs shown in the form of thick lines represent the values according to the specifications of LCL and LCTL, respectively.

[0066] Referring to the graphs, it can be seen that the LCL and LCTL characteristics shown in FIGS. 6 and 8 are not significantly different from the values according to the specifications and are similar to them. When the tape angle b was 60°, the LCTL showed a satisfactory level. However, both LCL and LCTL characteristics must be satisfied.

[0067] On the other hand, it can be seen that the LCL and LCTL characteristics shown in FIG. 7 exhibit values significantly improved over the specification values. FIG. 6b, which is the case in which the tape angle b is set to 40°, shows that the angle falls within the range of 29° to 52° and both LCL and LCTL characteristics are improved.

[0068] As a result, the tape forming the tape layer 200 according to Mathematical expression 1 should be formed at an angle within the range of 29° to 52°, but the cables including the tape layer 200 formed at an angle not satisfying Mathematical expression 1 did not exhibit improved LCL / LCTL characteristics, as in FIGS. 6 and 8. On the other hand, the Ethernet cable according to the present disclosure including the tape layer 200 formed at an angle satisfying Mathematical expression 1 not only exhibits improved LCL / LCTL characteristics but also satisfies the LCL / LCTL characteristics required in Class 1.

[0069] Class 1 requires high LCL / LCTL characteristics, and Class 2 requires high shielding characteristics. In the present disclosure, since the tape layer 200 is formed in a direction opposite to the twisting direction of the pair of cores 110 and 120, an Ethernet cable that satisfies the LCL / LCTL characteristics required in Class 1 as well as the shielding characteristics required in Class 2 was manufactured.

[0070] FIG. 9 is a flowchart for describing a method of manufacturing a highly shielded Ethernet cable for a vehicle according to an embodiment of the present disclosure.

[0071] A core unit 100 is formed by forming a pair of cores 110 and 120, which includes conductors 112 and 122 and insulators 114 and 124, and then twisting the pair of cores 110 and 120 in one direction (S610). In this case, the twisting direction of the pair of cores 110 and 120 may be an S-lay direction or a Z-lay direction.

[0072] After the core unit 100 is formed, a tape layer 200 is formed to surround around the outer circumference of the core unit 100 (S620). In this case, the tape layer 200 may be a polymer-based tape and is formed to surround the core unit 100 in a direction opposite to the twisting direction of the pair of cores 110 and 120. That is, when the pair of cores 110 and 120 is twisted in the S-lay direction, the tape layer 200 is formed in the Z-lay direction, and when the pair of cores 110 and 120 is twisted in the Z-lay direction, the tape layer 200 is formed in the S-lay direction.

[0073] A bedding layer 300 is formed on the outer circumference of the tape layer 200 (S630), a shielding layer 400 is formed on the outer circumference of the bedding layer 300 (S640), and a sheath layer 500 is formed on the outer circumference of the shielding layer 400 (S650). In this case, the shielding layer 400 may include a first shielding layer 410 and a second shielding layer 420.

[0074] An extruder (not shown) is used to fill a material around wires twisted at a predetermined pitch when manufacturing Ethernet cables, and when wires are loaded into the extruder, the wires are rotated. Accordingly, it was a very difficult task to extrude a predetermined amount of material into the groove between the pair of cores 110 and 120. However, the Ethernet cable according to the present disclosure solved this problem by forming the tape layer 200 on the pair of cores 110 and 120.

[0075] Further, since a tape layer 200 is formed by wrapping a tape around the core unit 100 in a direction opposite to the twisting direction of the pair of cores 110 and 120, it is possible to form a tape layer 200 with a uniform shape. As a result, there is an advantage of maximizing the improvement of LCL / LCTL characteristics and achieving high shielding.

[0076] Those skilled in the art could understand that the present disclosure can be achieved in other detailed ways without changing the spirit or the necessary features of the present disclosure. Therefore, the embodiments described above are only examples and should not be construed as being limitative in all respects. The scope of the present disclosure is defined by the following claims rather than the above detailed description, and all of changes and modifications obtained from the meaning and range of claims and equivalent concepts should be construed as being included in the scope of the present disclosure.

Examples

Embodiment Construction

[0023]The aforementioned objectives, other objectives, features, and advantages of the present disclosure would be easily understood through the following exemplary embodiments related to the accompanying drawings. However, the present disclosure is not limited to the embodiments described herein and may be implemented in other ways. On the contrary, the embodiments disclosed herein are provided so that the disclosed contents can be made thorough and complete and the spirit of the present disclosure can be sufficiently conveyed to those skilled in the art.

[0024]In the specification, when it is mentioned that a certain component is on another component, it means that it may be directly formed on the other component or that a third component may be interposed therebetween. Further, in the drawings, the thicknesses of components may be exaggerated for effective description.

[0025]When terms such as first, second, etc. are used to describe components in the specification, the components ...

[Technical Field]

[0001] The present disclosure relates to a highly shielded Ethernet cable for a vehicle and a manufacturing method thereof, and more specifically, to a highly shielded Ethernet cable for a vehicle and a manufacturing method thereof that can improve LCL / LCTL electrical characteristics.[Background Art]

[0002] Among communication cables that are most widely used in vehicles, Ethernet cables are generally applied to many applications. Further, the market for in-vehicle Ethernet is gradually expanding due to the development of autonomous driving and infotainment, and accordingly, the demand for Ethernet cables is significantly increasing. Here, infotainment refers to an integrated multimedia system in which information and entertainment are combined.

[0003] In accordance with this trend, applications that require in-vehicle data, such as autonomous driving and infotainment, are continuously developing, and their usage is increasing. However, currently deployed Ethernet cables face limitations in data rate and capacity, and thus cannot keep up with the development speed of applications. Therefore, the development of an alternative cable capable of transmitting and receiving more data is urgent.

[0004] Ethernet cables are broadly classified into Unshielded Twisted Pair (UTP) and Twisted Pair (STP), and since STP has better noise characteristics due to shielding compared to UTP, the development direction of high-performance Ethernet cables is focused on an STP structure.

[0005] Cables with the STP structure are broadly classified into two types, Class 1 and Class 2. Class 1 is characterized by lower shielding characteristics compared to Class 2 and requires LCL / LCTL (TCL / TCTL) parameters, whereas Class 2 requires higher shielding characteristics than Class 1 but does not require LCL / LCTL (TCL / TCTL) parameters.

[0006] Therefore, in order to overcome the limitations of currently deployed Ethernet cables, the development of a cable that can satisfy all parameters specified in Class 1 and Class 2 is required.[Disclosure][Technical Problem]

[0007] In order to solve the problems described above, an objective of the present disclosure is to provide a highly shielded Ethernet cable for a vehicle that is advantageous for high-speed and large-capacity data transmission because it has high shielding characteristics and satisfies certain levels of LCL / LCTL values, and a method of manufacturing the highly shielded Ethernet cable for a vehicle.

[0008] Objectives of the present disclosure are not limited to those described above and other objectives not stated herein can be clearly understood by those skilled in the art from the following description.[Technical Solution]

[0009] As a means for achieving the objectives described above, a highly shielded Ethernet cable for a vehicle according to an embodiment of the present disclosure includes: a core unit formed by twisting a pair of cores, which includes insulators surrounding conductors, at a predetermined pitch; a tape layer formed by wrapping a tape around an outer circumference of the core unit in a direction opposite to a twisting direction of the pair of cores; a bedding layer formed to surround the tape layer; a shielding layer formed to surround the bedding layer; and a sheath layer formed to surround the shielding layer.

[0010] The conductor may have a structure in which a plurality of conductor strands is arranged around a single central strand.

[0011] A width and a wrapping angle of the tape satisfy the following mathematical expression, 65 ⋅ e − 0.15 ⋅ a + 9 ≤ b ≤ 78 ⋅ e − 0.1 ⋅ a + 17 where a is the width of the tape and b is the wrapping angle of the tape.

[0012] The width of the tape is in a range of 5 mm to 20 mm, and the tape may be wrapped at an angle within a range calculated by the mathematical expression on the basis of a width of use, with respect to a central axis of the core unit.

[0013] The tape may be selected from a group of polymer-based tapes.

[0014] The predetermined pitch of the core unit formed by twisting a pair of cores together may be 7 mm to 50 mm.

[0015] The tape wrapped around the outer circumference of the core unit may be wound in an overlapping manner such that a width of the tape partially overlaps.

[0016] Meanwhile, a method of manufacturing a highly shielded Ethernet cable for a vehicle according to another embodiment of the present disclosure includes: forming a core unit by twisting a pair of cores, which includes conductors and insulators, at a predetermined pitch in one direction; forming a tape layer by wrapping a tape around an outer surface of the core unit in a direction opposite to the one direction; forming a bedding layer surrounding the tape layer; forming a shielding layer surrounding the bedding layer; and forming a sheath layer surrounding the shielding layer.

[0017] A width and a wrapping angle of the tape satisfy the following mathematical expression, 65 ⋅ e − 0.15 ⋅ a + 9 ≤ b ≤ 78 ⋅ e − 0.1 ⋅ a + 17 where a is the width of the tape and b is the wrapping angle of the tape.

[0018] The width of the tape is in a range of 5 mm to 20 mm, and the tape may be wrapped at an angle within a range calculated by the mathematical expression on the basis of a width of use, with respect to a central axis of the core unit.[Advantageous Effects]

[0019] According to the present disclosure, by forming a tape layer that surrounds cores constituting a cable, there is an effect of providing a highly shielded Ethernet cable for a vehicle that satisfies both high LCL / LCTL characteristics required in Class 1 and high shielding characteristics required in Class 2, and a method of manufacturing the highly shielded Ethernet cable.

[0020] Accordingly, there is an effect of providing a highly shielded Ethernet cable for a vehicle that can accommodate all applications that require large amounts of data transmission, such as autonomous driving and infotainment.

[0021] Effects of the present disclosure are not limited to those described above and other effects not stated herein can be clearly understood by those skilled in the art from the following description.[Description of Drawings]

[0022] FIG. 1 is a cross-sectional view of a highly shielded Ethernet cable for a vehicle according to an embodiment of the present disclosure, FIG. 2 is a perspective view showing a core and a tape layer of the highly shielded Ethernet cable for a vehicle according to an embodiment of the present disclosure, FIG. 3 is a conceptual diagram for describing a width and an angle of a tape forming the tape layer of the highly shielded Ethernet cable for a vehicle according to an embodiment of the present disclosure, FIG. 4 is a view for describing an incorrect example of forming a tape layer, FIG. 5 is a graph showing LCL / LCTL evaluation results according to a forming direction of a tape layer, FIGS. 6 and 8 are graphs showing LCL / LCTL evaluation results according to an angle of a tape forming a tape layer, and FIG. 9 is a flowchart for describing a method of manufacturing a highly shielded Ethernet cable for a vehicle according to an embodiment of the present disclosure. [Mode for Invention]

[0023] The aforementioned objectives, other objectives, features, and advantages of the present disclosure would be easily understood through the following exemplary embodiments related to the accompanying drawings. However, the present disclosure is not limited to the embodiments described herein and may be implemented in other ways. On the contrary, the embodiments disclosed herein are provided so that the disclosed contents can be made thorough and complete and the spirit of the present disclosure can be sufficiently conveyed to those skilled in the art.

[0024] In the specification, when it is mentioned that a certain component is on another component, it means that it may be directly formed on the other component or that a third component may be interposed therebetween. Further, in the drawings, the thicknesses of components may be exaggerated for effective description.

[0025] When terms such as first, second, etc. are used to describe components in the specification, the components should not be limited by the terms. These terms are used only to discriminate between some components from other components. The embodiments described and illustrated herein also include their complementary embodiments.

[0026] Further, when it is mentioned that a first element (or component) is operated or executed on a second element (or component), the first element (or component) should be understood to be operated or executed in an environment where the second element (or component) is operated or executed, or to be operated or executed through direct or indirect interaction with the second element (or component).

[0027] Further, the terms used in the specification are provided to describe embodiments without limiting the present disclosure. In the specification, a singular form includes a plural form unless specifically stated in the sentence. The terms "comprise" and / or "comprising" used in the specification do not exclude that another component exists or is added other than the stated component.

[0028] FIG. 1 is a cross-sectional view of a highly shielded Ethernet cable for a vehicle according to an embodiment of the present disclosure.

[0029] Referring to FIG. 1, a highly shielded Ethernet cable for a vehicle according to an embodiment of the present disclosure (hereinafter referred to as "Ethernet cable") includes a core unit 100, a tape layer 200, a bedding layer 300, a shielding layer 400, and a sheath layer 500.

[0030] The core unit 100 is formed by twisting a pair of cores 110 and 120 including insulators 114 and 124 surrounding conductors 112 and 122, respectively, at a predetermined pitch in one direction, that is, in any one direction of an S-lay or Z-lay direction. Here, the predetermined pitch at which the pair of cores 110 and 120 is twisted may be a value in the range of 7 mm to 50 mm.

[0031] The conductors 112 and 122 may be formed in a configuration in which a plurality of conductor strands is arranged around a single central strand. As shown in the figures, six conductor stands may be arranged around a single central strand. However, this is merely an embodiment, and around a single central strand, conductor strands may be arranged in N layers with 6N strands in the N-th layer; for example, 1+6 strands, 1+6+12 strands, and so on. Forming the conductors 112 and 122 in this configuration serves to maintain a stable shape of the conductors. Further, the conductors 112 and 122 may be made of a metallic material such as copper, aluminum, or silver, or an alloy thereof.

[0032] The insulators 114 and 124 are formed to surround the outer circumference of the conductors 112 and 122, and may be formed by extrusion of an insulating composition including a polymer resin having an electrical insulation property as a base resin. Here, the polymer resin is not particularly limited as long as it can achieve an electrical insulation property, and may include, for example, polyolefin-based resins such as polyethylene, ethylenevinyl acetate, ethylene-ethyl acetate, and ethylene-butyl acrylate.

[0033] The tape layer 200 is formed by wrapping a tape around the outer circumference of the core unit 100 in a direction opposite to the twisting direction of the pair of cores 110 and 120. An important aspect in forming the tape layer 200 is that the tape must be wrapped in a direction opposite to the direction of the stranded wire formed by the core unit 100. That is, when the stranded wire has a Z-lay, the tape must be wound in the S-lay direction, and when the stranded wire has an S-lay, the tape must be wrapped in the Z-lay direction. The reason why the direction of the tape must be opposite to the stranded wire will be described in more detail with reference to FIG. 4 and FIG. 5.

[0034] The bedding layer 300 is formed to surround the tape layer 200. In general Ethernet cables, the bedding layer 300 is disposed to fill the empty space between the core and the shielding layer, and by this structure, the concentricity of the Ethernet cables can be improved and the Ethernet cables can be structurally stabilized. In this embodiment, since the tape layer 200 surrounds core unit 100, the bedding layer 300 is disposed between the tape layer 200 and the shielding layer 400.

[0035] The bedding layer 300 may be made of resins such as polyvinyl chloride (PVC), polyethylene (PE), cross-linked polyethylene (XLPE), polypropylene (PP), and fluorinated ethylene-propylene (FEP). The bedding layer 200 using these resins increases the permittivity outside the core 100 and increases the physical distance between the core unit 100 and the shielding layer 400, thereby shifting the point at which attenuation distortion occurs to a higher frequency band than existing Ethernet cables by changing the overall effective permittivity and capacitance so that attenuation distortion does not occur within the required frequency band.

[0036] The shielding layer 400 is formed to surround the bedding layer 300. The shielding layer 400 performs a function of blocking electromagnetic waves emitted from the core unit 100 to the outside and electromagnetic waves attempting to penetrate into the Ethernet cable from the outside, thereby blocking them. The shielding layer 400 may include a first shielding layer 410 and a second shielding layer 420.

[0037] The first shielding layer 410 is formed to surround the bedding layer 300 in contact with the bedding layer 300, and an aluminum tape may be applied. For example, the first shielding layer 410 may be formed by an aluminum tape such as an aluminum-mylar (Al-mylar) tape in which an aluminum foil is attached to a polyester film.

[0038] The second shielding layer 420 is formed to surround the first shielding layer 410, and a metal braid may be applied. For example, the second shielding layer 420 may be formed by a metal braid such as a tin-plated copper braid.

[0039] The sheath layer 500 is formed to surround the shielding layer 400. The sheath layer 500 is formed to surround the shielding layer 400, that is, the second shielding layer 420, thereby forming the outermost portion of the Ethernet cable. The sheath layer 500 entirely surrounds the core unit 100 and performs a function of protecting the core unit 100 from external pressure or impact. For example, the sheath layer 500 may be made of a polyvinyl chloride resin, a polyethylene resin, a fluororesin, or the like, and may be formed by extrusion of a sheath composition including, as a base resin, a polyvinyl chloride resin having excellent flexibility.

[0040] FIG. 2 is a perspective view showing a core and a tape layer of the highly shielded Ethernet cable for a vehicle according to an embodiment of the present disclosure and FIG. 3 is a conceptual diagram for describing a width and an angle of a tape forming the tape layer of the highly shielded Ethernet cable for a vehicle according to an embodiment of the present disclosure.

[0041] As shown in FIG. 2, the conductors 112 and 122 composed of wires are twisted at a predetermined pitch, thereby forming the core unit 100. Thereafter, the tape layer 200 formed of a tape is formed over the core unit 100. The tape layer 200 is formed over the entire core unit 100 by winding a tape in a direction opposite to the twisting direction of the pair of cores 110 and 120.

[0042] In order to improve LCL / LCTL characteristics, the structure of the Ethernet cable must be uniform overall. However, in the case of a stranded wire, since the core unit 100 is twisted at a predetermined pitch, there is a problem in that extrusion of the material is difficult. In this case, when high pressure is applied to fully fill the material between the pair of cores 110 and 120, due to the pressure, the space between the cores may open or the pitch may become uneven.

[0043] In order to solve this problem, in the Ethernet cable according to the present disclosure, the core unit 100 is implemented by the tape layer 200 formed by winding a tape in a direction opposite to the direction of the stranded wire.

[0044] As described above, the tape layer 200 is formed by winding a tape in a direction opposite to the twisting direction of the pair of cores 110 and 120. In this case, the winding direction and the winding angle of the tape forming the tape layer 200 are schematically shown in FIG. 3.

[0045] The core unit 100 is formed by twisting cores at a predetermined pitch and then a tape is wound. In this case, the tape for forming the tape layer 200 has a predetermined width and is wound obliquely at a predetermined angle to wrap the core unit 100 composed of wires. The width of the tape may be selected in the range of 5 mm to 20 mm. In this case, when selecting the tape, the width of the tape should not exceed 20 mm, which is the maximum limit for ensuring a stable structure of the stranded body. Further, in the present disclosure, when a tape is generally wound, the tape is wrapped such that a portion of its width overlaps, and this winding is referred to as an overlapping manner. FIG. 3 shows the tape wound in this overlapping manner (the portion that overlaps and goes underneath is represented by a chain line).

[0046] When the tape forming the tape layer 200 is wrapped around the core unit 100, the width of the tape and the angle at which the tape is wrapped satisfy Mathematical expression 1. 65 ⋅ e − 0.15 ⋅ a + 9 ≤ b ≤ 78 ⋅ e − 0.1 ⋅ a + 17

[0047] In Mathematical expression 1, a is the width (mm) of the tape and b is the angle (deg) at which the tape is wrapped.

[0048] When a tape with a width of 8 mm is used, according to Mathematical expression 1, it is preferable that the tape is wrapped around the core unit 100 to form an angle of 29° to 52° with respect to the central axis of the core, which is perpendicular. Since the width and angle of the tape must satisfy Mathematical expression 1, if the tape width changes, the angle at which the tape is wound may also be changed.

[0049] FIG. 4 is a view for describing an incorrect example of forming a tape layer.

[0050] As described above, in the Ethernet cable according to the present disclosure, the tape layer 200 is formed in a direction opposite to the twisting direction of the pair of cores 110 and 120. That is, the twisting direction of the core unit 100 and the winding direction of the tape must be opposite to each other. The reason is to achieve the improvement effect of LCL / LCTL.

[0051] The situation in which the tape is wound in the same direction as the twisting direction of the pair of cores 110 and 120 is shown in FIG. 4. That is, the Ethernet cable was manufactured by forming the tape layer 200 in the same direction as the direction in which the core unit 100 is formed, and then sequentially forming the bedding layer 300, the shielding layer 400, and the sheath layer 500, and thereafter, the cross-section of the cable was actually observed. That is, FIG. 4 corresponds to the case in which both the stranded wire and the tape are formed in the S-lay direction or Z-lay direction.

[0052] As shown in the figure, when the tape layer 200 is formed on the core unit 100, if the formation direction of the tape layer 200 is the same as that of the pair of cores 110 and 120, it can be seen, as shown in (a) to (c), that the tape layer 200 is not uniformly formed.

[0053] That is, the tape partially penetrated into the groove between the cores of the stranded wire. More specifically, (a) shows that the tip of the tape was curled into the groove at the short-side end, and (b) and (c) show that grooves occurred on both sides or on one side due to tension.

[0054] As shown in (a) to (c), if the tape layer 200 is formed with a non-uniform structure, it adversely affects the LCL / LCTL characteristics. Therefore, when manufacturing the Ethernet cable according to the present disclosure, the tape layer 200 must be formed by winding a tape in a direction opposite to the direction in which the pair of cores 110, 120 is formed.

[0055] It was experimentally confirmed that when the tape layer 200 is formed by winding a tape in a direction opposite to the twisting direction of the pair of cores 110 and 120 and then the Ethernet cable is manufactured, the non-uniformity shown in (a) to (c) does not occur.

[0056] FIG. 5 is a graph showing LCL / LCTL evaluation results according to a forming direction of a tape layer.

[0057] In this embodiment, Ethernet cables were manufactured in two cases: when the twisting direction of the pair of cores 110 and 120 and the winding direction of the tape forming the tape layer 200 are the same, and when they are opposite, and then an LCL characteristic and an LCTL characteristic were observed for each case and plotted in graphs. The LCL / LCTL values should be lower than the specification values to exhibit good characteristics.

[0058] LCL refers to a phenomenon in which a common mode is converted into a differential mode due to an unbalanced structure such as core-to-core length and outer diameter, where attenuation and mode conversion simultaneously occur in sections causing reflected signals, which results in the signal returning to an input terminal (Return Loss). On the other hand, LCTL refers to a phenomenon in which the cause is similar to that of LCL, but the signal is directly output to the output terminal instead of returning to the input terminal (Insertion Loss).

[0059] LCL and LCTL are indicators for checking how symmetrical the cable structure is, and in order to suppress mode conversion, it is necessary to ensure a uniform (symmetry) structure throughout the cable. Further, a mode-converted signal is recognized as noise at a receiving terminal and may interfere with data transmission and reduce transmission efficiency; therefore, LCL / LCTL values must satisfy a certain level to be advantageous for high-speed and large-capacity data transmission.

[0060] (a) shows the evaluation results of a frequency-dependent LCL characteristic in a cable in which the pair of cores 110 and 120 and the tape layer 200 are formed in the same direction and in an Ethernet cable according to the present disclosure, together with a published LCL specification.

[0061] (a) shows the evaluation results of a frequency-dependent LCTL characteristic in a cable in which the pair of cores 110 and 120 and the tape layer 200 are formed in the same direction and in an Ethernet cable according to the present disclosure, together with a published LCTL specification.

[0062] Referring to (a) and (b), it can be seen that the Ethernet cable according to the present disclosure exhibits improved LCL / LCTL characteristics compared with the cable in which the pair of cores 110 and 120 and the tape layer 200 are formed in the same direction, and also satisfies the LCL / LCTL characteristics required for Class 1.

[0063] FIGS. 6 and 8 are graphs showing LCL / LCTL evaluation results according to an angle of a tape forming a tape layer.

[0064] As mentioned in the previous embodiment, in manufacturing the Ethernet cable according to the present disclosure, the tape wrapping the core unit 100 satisfies Mathematical expression 1 in terms of its width and wrapping angle. Accordingly, in this embodiment, to compare when the width and angle of the tape satisfy Mathematical expression 1 and when they do not, the wrapping angle of the tape was varied, and the LCL and LCTL characteristics were observed. In this case, the width a of the tape was applied uniformly as 8 mm.

[0065] In FIG. 6, after setting the tape angle b to 15° and manufacturing the cable, the LCL and LCTL characteristics were shown in a graph. In FIG. 7, after setting the tape angle b to 40° and manufacturing the cable, the LCL and LCTL characteristics were shown in a graph. Further, in FIG. 8, after setting the tape angle b to 60° and manufacturing the cable, the LCL and LCTL characteristics were shown in a graph. In FIGS. 6 to 8, the graphs shown in the form of thick lines represent the values according to the specifications of LCL and LCTL, respectively.

[0066] Referring to the graphs, it can be seen that the LCL and LCTL characteristics shown in FIGS. 6 and 8 are not significantly different from the values according to the specifications and are similar to them. When the tape angle b was 60°, the LCTL showed a satisfactory level. However, both LCL and LCTL characteristics must be satisfied.

[0067] On the other hand, it can be seen that the LCL and LCTL characteristics shown in FIG. 7 exhibit values significantly improved over the specification values. FIG. 6b, which is the case in which the tape angle b is set to 40°, shows that the angle falls within the range of 29° to 52° and both LCL and LCTL characteristics are improved.

[0068] As a result, the tape forming the tape layer 200 according to Mathematical expression 1 should be formed at an angle within the range of 29° to 52°, but the cables including the tape layer 200 formed at an angle not satisfying Mathematical expression 1 did not exhibit improved LCL / LCTL characteristics, as in FIGS. 6 and 8. On the other hand, the Ethernet cable according to the present disclosure including the tape layer 200 formed at an angle satisfying Mathematical expression 1 not only exhibits improved LCL / LCTL characteristics but also satisfies the LCL / LCTL characteristics required in Class 1.

[0069] Class 1 requires high LCL / LCTL characteristics, and Class 2 requires high shielding characteristics. In the present disclosure, since the tape layer 200 is formed in a direction opposite to the twisting direction of the pair of cores 110 and 120, an Ethernet cable that satisfies the LCL / LCTL characteristics required in Class 1 as well as the shielding characteristics required in Class 2 was manufactured.

[0070] FIG. 9 is a flowchart for describing a method of manufacturing a highly shielded Ethernet cable for a vehicle according to an embodiment of the present disclosure.

[0071] A core unit 100 is formed by forming a pair of cores 110 and 120, which includes conductors 112 and 122 and insulators 114 and 124, and then twisting the pair of cores 110 and 120 in one direction (S610). In this case, the twisting direction of the pair of cores 110 and 120 may be an S-lay direction or a Z-lay direction.

[0072] After the core unit 100 is formed, a tape layer 200 is formed to surround around the outer circumference of the core unit 100 (S620). In this case, the tape layer 200 may be a polymer-based tape and is formed to surround the core unit 100 in a direction opposite to the twisting direction of the pair of cores 110 and 120. That is, when the pair of cores 110 and 120 is twisted in the S-lay direction, the tape layer 200 is formed in the Z-lay direction, and when the pair of cores 110 and 120 is twisted in the Z-lay direction, the tape layer 200 is formed in the S-lay direction.

[0073] A bedding layer 300 is formed on the outer circumference of the tape layer 200 (S630), a shielding layer 400 is formed on the outer circumference of the bedding layer 300 (S640), and a sheath layer 500 is formed on the outer circumference of the shielding layer 400 (S650). In this case, the shielding layer 400 may include a first shielding layer 410 and a second shielding layer 420.

[0074] An extruder (not shown) is used to fill a material around wires twisted at a predetermined pitch when manufacturing Ethernet cables, and when wires are loaded into the extruder, the wires are rotated. Accordingly, it was a very difficult task to extrude a predetermined amount of material into the groove between the pair of cores 110 and 120. However, the Ethernet cable according to the present disclosure solved this problem by forming the tape layer 200 on the pair of cores 110 and 120.

[0075] Further, since a tape layer 200 is formed by wrapping a tape around the core unit 100 in a direction opposite to the twisting direction of the pair of cores 110 and 120, it is possible to form a tape layer 200 with a uniform shape. As a result, there is an advantage of maximizing the improvement of LCL / LCTL characteristics and achieving high shielding.

[0076] Those skilled in the art could understand that the present disclosure can be achieved in other detailed ways without changing the spirit or the necessary features of the present disclosure. Therefore, the embodiments described above are only examples and should not be construed as being limitative in all respects. The scope of the present disclosure is defined by the following claims rather than the above detailed description, and all of changes and modifications obtained from the meaning and range of claims and equivalent concepts should be construed as being included in the scope of the present disclosure.

Examples

Embodiment Construction

[0023]The aforementioned objectives, other objectives, features, and advantages of the present disclosure would be easily understood through the following exemplary embodiments related to the accompanying drawings. However, the present disclosure is not limited to the embodiments described herein and may be implemented in other ways. On the contrary, the embodiments disclosed herein are provided so that the disclosed contents can be made thorough and complete and the spirit of the present disclosure can be sufficiently conveyed to those skilled in the art.

[0024]In the specification, when it is mentioned that a certain component is on another component, it means that it may be directly formed on the other component or that a third component may be interposed therebetween. Further, in the drawings, the thicknesses of components may be exaggerated for effective description.

[0025]When terms such as first, second, etc. are used to describe components in the specification, the components ...

Claims

1. A highly shielded Ethernet cable for a vehicle, comprising: a core unit formed by twisting a pair of cores, which includes insulators surrounding conductors, at a predetermined pitch; a tape layer formed by wrapping a tape around an outer circumference of the core unit in a direction opposite to a twisting direction of the pair of cores; a bedding layer formed to surround the tape layer; a shielding layer formed to surround the bedding layer; and a sheath layer formed to surround the shielding layer.

2. The highly shielded Ethernet cable of claim 1, wherein the conductor has a structure in which a plurality of conductor strands is arranged around a single central strand.

3. The highly shielded Ethernet cable of claim 1, wherein a width and a wrapping angle of the tape satisfy the following mathematical expression, 65 ⋅ e − 0.15 ⋅ a + 9 ≤ b ≤ 78 ⋅ e − 0.1 ⋅ a + 17 where a is the width of the tape and b is the wrapping angle of the tape.

4. The highly shielded Ethernet cable of claim 3, wherein a width of the tape is in a range of 5 mm to 20 mm, and the tape is wrapped to form an angle within a range calculated by the mathematical expression on the basis of a width of use, with respect to a central axis of the core unit.

5. The highly shielded Ethernet cable of claim 1, wherein the tape is selected from a group of polymer-based tapes.

6. The highly shielded Ethernet cable of claim 1, wherein the predetermined pitch of the core unit formed by twisting a pair of cores together is 7 mm to 50 mm.

7. The highly shielded Ethernet cable of claim 1, wherein the tape wrapped around the outer circumference of the core unit is wound in an overlapping manner such that a width of the tape partially overlaps.

8. A method of manufacturing a highly shielded Ethernet cable for a vehicle, the method comprising: forming a core unit by twisting a pair of cores, which includes conductors and insulators, at a predetermined pitch in one direction; forming a tape layer by wrapping a tape around an outer surface of the core unit in a direction opposite to the one direction; forming a bedding layer surrounding the tape layer; forming a shielding layer surrounding the bedding layer; and forming a sheath layer surrounding the shielding layer.

9. The method of claim 8, wherein a width and a wrapping angle of the tape satisfy the following mathematical expression, 65 ⋅ e − 0.15 ⋅ a + 9 ≤ b ≤ 78 ⋅ e − 0.1 ⋅ a + 17 where a is the width of the tape and b is the wrapping angle of the tape.

10. The method of claim 8, wherein a width of the tape is in a range of 5 mm to 20 mm, and the tape is wrapped to form an angle within a range calculated by the mathematical expression on the basis of a width of use, with respect to a central axis of the pair of cores.

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