CN116964691A - Communication cable and method for manufacturing the same - Google Patents
Communication cable and method for manufacturing the same Download PDFInfo
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- CN116964691A CN116964691A CN202180087074.1A CN202180087074A CN116964691A CN 116964691 A CN116964691 A CN 116964691A CN 202180087074 A CN202180087074 A CN 202180087074A CN 116964691 A CN116964691 A CN 116964691A
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- 239000004800 polyvinyl chloride Substances 0.000 description 7
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- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B11/00—Communication cables or conductors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Communication Cables (AREA)
Abstract
The application provides a communication cable which corresponds to high frequency data transmission and can simplify the internal structure of the cable. The application discloses a communication cable 1 formed by twisting a plurality of insulated wires 12 formed by coating conductors 14 with insulators 16. In the communication cable 1, the conductor 14 includes a single wire having a circular cross section or a compression strand having a circular cross section, and a ratio of a total of wire pitches of the compression strands to an arc length of a circumscribed circle of the compression strand is 71% or less.
Description
Technical Field
The present application relates to a communication cable corresponding to high frequency data transmission and a method of manufacturing the same.
Background
In recent years, the performance of information communication devices in automobiles and the multifunction of in-vehicle multimedia have been Advanced, and it is considered that Advanced driving assistance systems (ADAS; advanced Driver-Assistance Systems), automatic driving, and the like are also the subjects of the future, and the increase in the performance and the increase in the devices mounted thereon have been Advanced. Such progress brings about a large capacity of information traffic, and thus data transmission at high frequencies is required.
Recently, as an in-vehicle Ethernet (Ethernet) standard, ieee802.3ch Multi-Gig Automotive Ethernet PHY GBASE-T1 (hereinafter simply referred to as "Multi-Gig Automotive Ethernet (Multi-G car Ethernet) standard") has been established, and it is considered that the in-vehicle communication cable is required to satisfy the Multi-Gig Automotive Ethernet standard.
However, there are some technical problems in high frequency data transmission, for example, as follows: suppression of an internal delay difference (difference in transmission delay time in pair), and suppression of a band gap phenomenon (abrupt decrease in frequency characteristics of signal attenuation) under high-band conditions.
Patent document 1 discloses a multi-core cable that attempts to solve the above-described technical problems concerning high-frequency data transmission.
In the technique of patent document 1, 8 coaxial wire pairs (11 to 18) are housed in a multi-core cable (1). In each coaxial cable 10, a center conductor 21 is covered with an insulator 22, and the outer periphery thereof is covered with an outer conductor 23 and an outer jacket 24. In the outer conductor, a thin metal wire (M) is wound around an insulator as an inner layer (23A), and a metal resin tape (T) is wound around the inner layer as an outer layer (23B).
In this technique, in particular, the band gap phenomenon is suppressed by setting the winding direction of the thin metal wire and the winding direction of the metal resin tape to be opposite to each other and setting the difference between the winding angles (angle θ3) between the two to be within a predetermined range (see paragraphs 0017 to 0027, fig. 1 to 2, examples, fig. 4, and the like).
Prior art literature
Patent literature
Patent document 1: japanese patent publication No. 6269718.
Disclosure of Invention
Problems to be solved by the application
However, as described above, in the wire pair of patent document 1, an outer conductor including a fine metal wire and a metal resin tape is disposed in a coaxial wire, and it is necessary to set the winding direction and the winding angle of the fine metal wire and the metal resin tape. The technology of patent document 1, that is, the internal structure of the cable is very complex, and there is room for improvement in the internal structure of the cable.
Accordingly, a main object of the present application is to provide a communication cable which corresponds to high frequency data transmission (in the Multi-Gig Automotive Ethernet standard, a high frequency band of at least 8GHz or more satisfies the standard) and which can simplify the internal structure of the cable.
Solution to the problem
The present inventors have repeatedly studied technically to solve the above-mentioned problems, and have found the following cases, and have completed the present application, as follows: in particular, in the case of a high-frequency signal, the skin effect causes a large current density in the surface layer of the conductor, which is disadvantageous in terms of high-frequency transmission for a twisted wire formed by twisting a plurality of wires, but in the case of a cable having a cross-sectional shape close to a circular shape such as a single wire having a circular cross-sectional shape or a compressed twisted wire having a constant wire pitch, the impedance at the time of high-frequency transmission decreases as the cross-sectional shape approaches a circular shape.
That is, according to the present application, there is provided a communication cable in which a plurality of insulated wires each having a conductor covered with an insulator are twisted, wherein the conductor includes a single wire having a circular cross section or a compressed twisted wire having a circular cross section, and a ratio of a total wire pitch of the compressed twisted wires to an arc length of a circumscribed circle of the compressed twisted wire is 71% or less.
Effects of the application
According to the present application, a communication cable corresponding to high-frequency data transmission (in the Multi-Gig Automotive Ethernet standard, a high-frequency band of at least 8GHz or more satisfies the standard) can be provided with a simple structure in which a conductor is made of a single wire having a circular cross section or a compression twisted wire having a circular cross section and a certain correlation between the arc length of an outer circle and the wire pitch, without adding a complicated structure to an external conductor.
Drawings
Fig. 1 is a cross-sectional view showing a schematic structure of a communication cable.
Fig. 2 is a view schematically showing a cross-sectional shape of a compression strand.
Fig. 3 is a graph showing the relationship between the frequency and the insertion loss of each sample of the embodiment.
Detailed Description
A communication cable according to a preferred embodiment of the present application will be described below.
In the present specification, "to" representing a numerical range means that the lower limit value and the upper limit value are included in the numerical range.
Fig. 1 is a cross-sectional view showing a schematic configuration of a communication cable 1.
As shown in fig. 1, the communication cable 1 has: the twisted pair body 10, the extrusion package 20, the first shielding layer 40, the second shielding layer 50 and the outer jacket 60 are wound and coated on the outer periphery of the twisted pair body 10 in the order of the first shielding layer 40, the second shielding layer 50 and the outer jacket 60.
The twisted pair 10 includes 2-core (2) insulated wires 12, with the first core 10A and the second core 10B being used in pairs. The third core and the fourth core may be added as the second twisted pair, and these cores may be used in pairs (may include 4 cores), or more pairs of cores may be added and used. When a pair of cores is added, the insulated wire 12 is twisted into four cores (Quad).
The insulated wire 12 includes a conductor 14 and an insulator 16, and has a structure in which an outer periphery of the conductor 14 is covered with the insulator 16.
The conductor 14 includes a single wire having a circular cross section or a compressed strand having a circular cross section, and the ratio of the sum of the wire pitches of the compressed strands to the arc length of the circumscribed circle of the compressed strand is 71% or less.
The term "single wire having a circular cross section" means, as expressed in a literal sense, a single wire having a constant diameter and a circular cross section.
"compression in which the cross section is circular, the ratio of the sum of the wire pitches of the compression strands to the arc length of the circumscribing circle of the compression strands is 71% or less" means a compression strand in which a plurality of wires 15 are twisted and compressed, as shown in fig. 2, the ratio D/L of the sum D of the wire pitches of the compression strands to the arc length L of the circumscribing circle 90 of the compression strand is 71% or less.
"arc length L, wire pitch D, and sum D thereof" are values obtained by observing a cross section of a compressed strand as conductor 14 using VHX-6000 manufactured by KEYENCE corporation DIGITAL MICROSCOPE (digital microscope), and are values obtained by executing a command to measure/scale > plane measurement > arc.
That is, the compression twisted wire is formed by simply twisting a plurality of wires 15 (hereinafter referred to as "simple twisted wire") and compressing the twisted wire by passing through a die. In this case, as shown in an enlarged portion of fig. 2, a bending portion 100 is formed in the wire 15A in the outer peripheral portion, and a buckling point 102 receiving the influence of the passage through the die exists in the bending portion 100. The wire pitch d is a gap between the inflection points 102 of adjacent wires 15A on the arc of the circumscribed circle 90.
The bending portion 100 is plural in number according to the number of wires 15A in the outer peripheral portion. For example, in the case of the configuration of fig. 2 in which 7 wires 15 are twisted, 6 wires 15A in the outer peripheral portion except for the wire 15B in the central portion are adjacent to each other, and 6 gaps exist between them. Here, "sum D" is a total value obtained by adding up gaps at all 6 points (wire pitch d×6 points).
The conductor 14 (including the wire 15) is preferably a annealed copper wire, and may be coated with a plating layer (not shown) of any of tin, nickel, and silver.
The outer diameter of the conductor 14 is preferably 0.4mm to 0.6mm.
The transmission characteristics at high frequencies are affected by the skin effect, and the current density increases in the surface layer of the conductor 14.
The "skin effect" is a phenomenon in which when an alternating current flows in the conductor 14, the current density is high in the surface layer of the conductor 14, and is low when the surface layer is separated. The higher the frequency, the more current is concentrated on the surface layer, and the higher the ac impedance of the conductor 14 becomes. The depth of the skin layer affected by the skin effect, that is, the depth delta [ mu ] m of the skin layer having a high current density, is derived from the skin depth calculation formula below, and decreases as the frequency f [ kHz ] increases.
In the following formula, "ρ" is the volume impedance rate [ Ω·m ] of the conductor 14]It is 1.72X10 -8 Omega.m. "μ" is the relative permeability of the conductor 14, which is 1.
[ number 1]
Based on the above equation, when the surface layer of the conductor 14 at a high frequency is visually compared with that of each of the simple twisted wire, the compressed twisted wire, and the single wire, the region of the simple twisted wire where the current density is high is limited to only a part of the region of the wire 15 of the conductor 14 disposed on the outer peripheral portion. When it is replaced with a compression strand, this region slightly increases in the circumferential direction of the conductor 14, and when it is replaced with a single wire, this region further increases throughout the circumference of the conductor 14.
In the present embodiment, focusing on how much influence the form of the conductor 14 (simple twisted wire, compressed twisted wire, and single wire) has on the high-frequency transmission characteristics, it has been found by the following examples that the high-frequency transmission characteristics are excellent when the conductor 14 is a single wire having a circular cross section or a compressed twisted wire having a circular cross section and a ratio D/L of the sum D of the wire pitches D to the arc length L of the circumscribed circle 90 is 71% or less.
The insulator 16 is formed by extruding an insulating resin from a die of an extruder. The insulating resin is preferably crosslinked polyethylene (XLPE; cross-linked polyethylene) or Polypropylene (PP).
The thickness of the insulator 16 is preferably 0.2mm to 0.4mm.
The extrusion 20 is formed by laminating polyethylene terephthalate (PET) in a band shape. The extrusion 20 may be formed of a nonwoven fabric in a belt shape. The extrusion 20 may also be formed from polypropylene in the form of a tape.
The thickness of the extrusion 20 is preferably 0.02mm to 0.1mm.
In addition, the extrusion 20 is not an essential component and may be omitted.
The first shielding layer 40 is formed by overlapping metal strips.
The metal tape is formed by bonding a metal foil to a resin tape, preferably an aluminum foil to a polyethylene terephthalate tape (PET tape). In the first shielding layer 40, the metal foil is overlapped so as to be exposed to the outer periphery.
The thickness of the metal strip is preferably 0.02mm to 0.05mm.
The second shield layer 50 is formed by braiding a plurality of metal wires. The second shield layer 50 may be formed by winding a plurality of metal wires transversely at a pitch equal to or smaller than a predetermined value. The respective wires are preferably wires called tin-plated annealed copper wires (TA; tinned Annealed copper) which are formed by coating an annealed copper wire with a tin plating layer.
The outer diameter of the wire is preferably 3.0mm to 3.5mm.
The jacket 60 is a sheath called a sheath (shaping), and is formed by extruding a jacket resin from a die of an extruder. The jacket resin preferably comprises polyvinyl chloride (PVC; polyVinyl Chloride) or a thermoplastic elastomer (TPE; thermoplastic Elastomers).
The thickness of the outer jacket 60 is preferably 0.2mm to 0.6mm.
The twisted pair 10 includes 2-core (2) insulated wires 12 as described above, and has a structure in which 2 insulated wires 12 are twisted at a predetermined pitch.
The upper limit value and the lower limit value of the twisted pair pitch of the insulated wire 12 are set from the viewpoints of the internal delay difference and the Insertion Loss (IL).
The lower limit of the twisted pair pitch is 7.0mm, preferably 7.9mm, which is practically possible from the viewpoint of suppressing the difference in the internal delay and achieving stable production. The shorter the twisted pair pitch of the insulated wires 12, the more closely twisted the insulated wires 12 are twisted, and the twisting balance of each other is unstable. As a result, a physical difference in length (length unevenness) occurs between the insulated wires 12, and it is difficult to suppress the intra-pair delay difference.
The upper limit value of the twisted pair pitch is derived from the viewpoint of suppressing the band gap phenomenon at high frequencies (for example, up to more than 10 GHz). The inventors of the present application found that there is a correlation between the upper limit value of the twisted pair pitch and the material (dielectric constant) of the insulator 16 in the process of repeating trial production of the communication cable 1 and measurement of the insertion loss, and that the correlation can be derived from the following relational expression relating to the dielectric constant of the insulator 16. Specifically, the following was found: typically, the wavelength is expressed by wavelength=speed/frequency of the wave, and the upper limit value of the twisted pair pitch is approximately a value obtained by dividing the wavelength by the dielectric constant of the insulator 16.
Accordingly, as a matter of technical knowledge, when the speed of light is set to 100, the speed of a signal transmitted in a cable pair is about 70% (NVP: nominal Velocity of Propagation, nominal propagation speed). If the frequency is set to 10GHz, this upper limit value of the twisted pair pitch is theoretically derived from the following equation.
Upper limit value of twisted pair pitch [ mm ]
= (wavelength) × (dielectric constant of 1/insulator 16)
= (speed of light x NVP/frequency) × (dielectric constant of 1/insulator 16)
＝300,000,000[m/s]×0.7/10×10 9 [Hz]X (dielectric constant of 1/insulator 16). Times.1,000 [ mm ]]
When the wavelength of the signal transmitted in the cable pair resonates in synchronization with the twisted pair pitch of the insulated wire 12, a band gap phenomenon occurs, (i) when the insulator 16 is made of crosslinked polyethylene, the upper limit value of the twisted pair pitch of the insulated wire 12 is about 9.55mm, and when the upper limit value exceeds the upper limit value, a resonance point is formed at a low frequency of 10GHz or less, and a band gap phenomenon is likely to occur; (ii) When the insulator 16 is made of polypropylene, if the upper limit of the twisted pair pitch of the insulated wire 12 is about 10.00mm, a resonance point is formed at a low frequency of 10GHz or less, and a band gap phenomenon is likely to occur.
TABLE 1
Alternatively, an inner jacket may be formed between the extrusion 20 and the first shielding layer 40. In such a case, the inner jacket is preferably formed by extruding the resin for the inner jacket from a die of an extruder. The resin for the inner sleeve preferably comprises polyvinyl chloride (PVC; polyVinyl Chloride) or a thermoplastic elastomer (TPE; thermoplastic Elastomers).
The thickness of the inner sleeve is preferably 2.3 mm-2.9 mm.
Next, a method of manufacturing the communication cable 1 will be described.
First, as the conductor 14, a single wire having a circular cross section or a compressed strand having a circular cross section is prepared, and the ratio D/L of the sum D of the wire pitches D of the compressed strands to the arc length L of the circumscribed circle 90 is 71% or less. When a compressed strand is prepared as the conductor 14, a simple strand may be passed through a die while being conveyed in the longitudinal direction thereof, and compressed, and the correlation between the arc length L of the circumscribed circle 90 and the wire pitch d may be controlled by the opening diameter of the die.
Thereafter, the conductor 14 is coated with an insulating resin, and is irradiated with an electron beam to crosslink the resin, thereby forming the insulator 16, and the insulated wire 12 is manufactured.
Thereafter, 2 insulated wires 12 are twisted (twisted) at a certain pitch.
Thereafter, a polyethylene terephthalate tape (PET tape) is laminated around the twisted pair 10 to form the extrusion 20.
Thereafter, the extruded member 20 is laminated around the metal tape to form a first shielding layer 40, and a plurality of metal wires are woven to form a second shielding layer 50.
Finally, the jacket resin is extruded and coated onto the second shield layer 50 to form the jacket 60, whereby the communication cable 1 can be manufactured.
According to the communication cable 1 described above, a communication cable (see the following embodiments) corresponding to high-frequency data transmission (in the Multi-Gig Automotive Ethernet standard, a high-frequency band of at least 8GHz or more satisfies the standard) can be provided by a simple structure in which the conductor 14 includes a single wire having a circular cross section or a compression twisted wire having a circular cross section and a certain correlation between the arc length L of the circumscribed circle 90 and the wire pitch d.
The communication cable 1 may be used for any purpose as long as it is used for communication, and is preferably used for in-vehicle use, and more preferably used for transmission of an image or video signal of an in-vehicle camera. That is, the communication cable 1 is preferably set to a cable according to the ISO-6722 standard or the ISO-19642 standard.
Examples (example)
In this example, the relationship between the transmission characteristics of an actual communication cable and the standard value of Multi-Gig Automotive Ethernet was measured.
(1) Sample preparation
(1.1) sample 1
First, 7 annealed copper wires having a diameter of 0.15mm were twisted to form a conductor having an outer diameter of 0.45 mm. The conductor is a simple stranded wire.
Thereafter, polyethylene was extruded and coated on the conductor, and the conductor was crosslinked by irradiation with electron beams to form an insulator having a thickness of 0.2mm composed of crosslinked polyethylene (XLPE), thereby forming an insulated wire having an outer diameter of 1mm.
Thereafter, 2 insulated wires were twisted (twisted) at a pitch of 8mm to form a twisted pair.
Thereafter, a polyethylene terephthalate tape (PET tape) having a thickness of 0.025mm as an extrusion coating was 1/2-folded (the PET tape was wound while being overlapped by 1/2 of the width of the PET tape) with respect to the twisted pair.
Then, a metal tape having a thickness of 0.04mm, which was obtained by bonding an aluminum foil having a thickness of 0.01mm and a polyethylene terephthalate tape (PET tape) having a thickness of 0.025mm, was prepared as the first shield layer, and the metal tape was wound 1/4 over the extrusion coating material to form a first shield layer having an outer diameter of 2.6 mm.
Thereafter, 86 tin-plated annealed copper wires (TA) having a diameter of 0.1mm were prepared as the second shield layer, and the tin-plated annealed copper wires were woven for the first shield layer, thereby forming a second shield layer having an outer diameter of 3.1 mm.
Finally, polyvinyl chloride (PVC) was extruded and coated onto the second shield layer to manufacture a communication cable having an outer diameter of 4mm.
(1.2) sample 2
Compared with sample 1, the conductor (simple stranded wire) in sample 1 was changed to a single wire with a diameter of 0.45 mm.
(1.3) sample 3 to sample 5
Compared with sample 1, the conductor (simple strand) in sample 1 was mainly changed to three compression strands with a diameter of 0.45 mm. Here, the present application was modified to a compression strand in which 3 kinds of simple strands having different wire diameters were compressed by passing them through a plurality of types of dies, thereby obtaining a compression strand having an outer diameter of 0.45mm (three kinds of compression strands having different wire diameters and the same outer diameter were prepared).
For each sample, the sum of the wire pitches with respect to the arc length of the circumscribed circle of the compression strand was calculated using DIGITAL MICROSCOPE (digital microscope) VHX-6000 manufactured by KEYENCE corporation, and the results were as follows.
TABLE 2
(2) Evaluation of samples
Each sample was cut out 5m and the Insertion Loss (IL; insertion Loss) at the high frequency band was measured for it. The measurement results are shown in FIG. 3.
In the Multi-Gig Automotive Ethernet standard, the standard value is set only up to the maximum high frequency band of 4 GHz. In fig. 3, a threshold value of 4GHz or later is calculated based on the following expression for the standard value of Insertion Loss (IL) described in Multi-Gig Automotive Ethernet standard, and is used as a reference standard value.
[ number 2]
IL≤0.68·f 0.45 +0.002·f[dB]
(3) Summary
As shown in fig. 3, in sample 1, the conductor was a simple stranded wire, and in the band around 5GHz, the transmission characteristic was lower than the reference value. In contrast, in samples 2 to 5, the conductors were compression twisted wires in which the ratio of the sum of the single wire or wire pitches to the arc length of the circumscribed circle was 71% or less, and the transmission characteristics satisfied the reference standard value in the band exceeding 4 GHz. In particular, even in the 10GHz band, samples 2 to 4 satisfy the reference standard value in terms of the transmission characteristics.
From the above, it is found that it is useful to apply, as a conductor, a single wire having a circular cross section or a compression twisted wire having a circular cross section and a ratio of the sum of wire pitches to the arc length of the circumscribed circle of 71% or less, and it is found that it is useful to apply, particularly in the 10GHz band, a compression twisted wire having the ratio of 42% or less.
In this example, although an example was shown in which the conductor was 26AWG (American Wire Gauge ), even if the conductor was 24AWG or 28AWG, the same results as in fig. 3 were obtained in that the values of the arc length L, the wire pitch D, and the sum D thereof were varied, but the values of the ratio D/L were substantially the same as those of the conductor when the conductor was 26 AWG.
The present application claims priority from japanese patent application publication 2020-214986, which was filed on 12 months and 24 days 2020. The matters described in the specification, claims and drawings of the above application are all incorporated into the present application.
Industrial applicability
The present application relates to a communication cable and a method for manufacturing the same, and is useful for providing a communication cable corresponding to high frequency data transmission.
Description of the reference numerals
1. Communication cable
10. Double-twisted body
10A-10B first core-second core
12. Insulated wire
14. Conductor
15. Wire rod
15A wire rod of periphery
15B wire rod in the center
16. Insulation body
20. Extruding package
40. First shielding layer
50. Second shielding layer
60. Coat cover
90. External circle
100. Bending part
102. Point of inflection
L arc length
d wire spacing
Sum of D
D/L ratio
Claims (4)
1. A communication cable is formed by twisting a plurality of insulated wires formed by coating conductors with insulators, and is characterized in that,
the conductor includes a single wire having a circular cross section or a compressed strand having a circular cross section, and the ratio of the sum of the wire pitches of the compressed strands to the arc length of the circumscribed circle of the compressed strand is 71% or less.
2. A communication cable according to claim 1 wherein,
the conductor includes a compression strand having a circular cross section, and a ratio of a sum of wire pitches of the compression strand to a circular arc length of a circumscribed circle of the compression strand is 42% or less.
3. A communication cable according to claim 1 or 2, wherein,
the communication cable is used for vehicle-mounted applications.
4. A method for manufacturing a communication cable, comprising the steps of:
a step of preparing, as a conductor, a single wire having a circular cross section or a compressed strand having a circular cross section, wherein the ratio of the sum of wire pitches of the compressed strands to the arc length of a circumscribed circle of the compressed strand is 71% or less; and
and a step of forming an insulated wire by coating the conductor with an insulator.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2020-214986 | 2020-12-24 | ||
| JP2020214986 | 2020-12-24 | ||
| PCT/JP2021/048113 WO2022138898A1 (en) | 2020-12-24 | 2021-12-24 | Communication cable and method for manufacturing same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116964691A true CN116964691A (en) | 2023-10-27 |
Family
ID=82158087
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202180087074.1A Pending CN116964691A (en) | 2020-12-24 | 2021-12-24 | Communication cable and method for manufacturing the same |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPWO2022138898A1 (en) |
| CN (1) | CN116964691A (en) |
| WO (1) | WO2022138898A1 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5530501B2 (en) * | 2012-11-05 | 2014-06-25 | 冨士電線株式会社 | Twisted pair cable |
| JP6075490B1 (en) * | 2016-03-31 | 2017-02-08 | 株式会社オートネットワーク技術研究所 | Shield wire for communication |
-
2021
- 2021-12-24 WO PCT/JP2021/048113 patent/WO2022138898A1/en active Application Filing
- 2021-12-24 JP JP2022571669A patent/JPWO2022138898A1/ja active Pending
- 2021-12-24 CN CN202180087074.1A patent/CN116964691A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| JPWO2022138898A1 (en) | 2022-06-30 |
| WO2022138898A1 (en) | 2022-06-30 |
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