JP2014146549A - Shield cable - Google Patents
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本発明は、差動信号を伝送するシールドケーブルに関するものである。 The present invention relates to a shielded cable that transmits a differential signal.
差動信号を伝送するためのシールドケーブルとして、従来より、導体を絶縁体で被覆した絶縁電線２本を平行または撚り合わせて配置し、これを共通の外部導体（シールド）で覆った構造のものがある。 Conventionally, a shielded cable for transmitting differential signals has a structure in which two insulated wires covered with an insulator are parallel or twisted and covered with a common outer conductor (shield). There is.
このようなシールドケーブルでは、両絶縁電線の絶縁体と外部導体との間に隙間が発生し、この隙間の一方に接地用のドレイン線が配置されたり、外部導体が変形して隙間に侵入したりすることにより、構造の対称性が失われ、スキュー等の特性劣化を招き易いという問題があった。 In such a shielded cable, a gap is generated between the insulator of both insulated wires and the outer conductor, and a grounding drain wire is disposed in one of the gaps, or the outer conductor is deformed and enters the gap. As a result, the symmetry of the structure is lost, and there is a problem that characteristic deterioration such as skew is likely to occur.
この問題を解決したシールドケーブルとして、図４に示すように、平行に配置した２つの導体４２を一括して被覆するように絶縁体４３を設け、その絶縁体４３の外周に外部導体４４を設けたものがある。 As a shielded cable that solves this problem, as shown in FIG. 4, an insulator 43 is provided so as to collectively cover two conductors 42 arranged in parallel, and an outer conductor 44 is provided on the outer periphery of the insulator 43. There is something.
図４のシールドケーブル４１では、絶縁体４３と外部導体４４との間に隙間が存在しないため、構造の対称性を保持することが可能であり、構造の対称性が失われることによる特性劣化を抑制することが可能となる。 In the shielded cable 41 of FIG. 4, since there is no gap between the insulator 43 and the outer conductor 44, it is possible to maintain the symmetry of the structure, and the characteristic deterioration due to the loss of the symmetry of the structure. It becomes possible to suppress.
なお、この出願の発明に関連する先行技術文献情報としては、特許文献１〜４がある。 In addition, there exists patent documents 1-4 as prior art document information relevant to the invention of this application.
しかしながら、図４のシールドケーブル４１では、外部導体４４の内部に隙間（空気層）などの誘電率の低い部分を含まないために、所望のインピーダンスを得るためには絶縁体４３のサイズ（つまり外部導体４４よりも内側の断面積）が大きくなり、シールドケーブル全体の大型化を招き、また誘電損も大きくなってしまうという問題がある。 However, since the shielded cable 41 in FIG. 4 does not include a portion having a low dielectric constant such as a gap (air layer) inside the outer conductor 44, the size of the insulator 43 (that is, the external conductor) is required to obtain a desired impedance. There is a problem that the cross-sectional area inside the conductor 44 is increased, leading to an increase in the size of the entire shielded cable and an increase in dielectric loss.
従来より、絶縁体４３として誘電率の低い発泡絶縁体を用いることで小型化、誘電損の抑制を図っているが、更なる小型化、誘電損の抑制が可能なシールドケーブルが望まれている。 Conventionally, a foamed insulator having a low dielectric constant is used as the insulator 43 to reduce the size and the dielectric loss. However, a shielded cable that can further reduce the size and suppress the dielectric loss is desired. .
本発明は上記事情に鑑み為されたものであり、小型で誘電損の小さいシールドケーブルを提供することを目的とする。 The present invention has been made in view of the above circumstances, and an object thereof is to provide a shielded cable that is small and has a small dielectric loss.
本発明は上記目的を達成するために創案されたものであり、平行に配置された２本の導体と、該２本の導体を一括して覆う絶縁体と、該絶縁体の外周を覆う外部導体と、を備え、前記２本の導体間に、前記絶縁体よりも誘電率が低い低誘電率部を設けたシールドケーブルである。 The present invention was devised to achieve the above object, and includes two conductors arranged in parallel, an insulator that collectively covers the two conductors, and an external that covers the outer periphery of the insulator. A shield cable provided with a low dielectric constant portion having a dielectric constant lower than that of the insulator between the two conductors.
前記低誘電率部は、前記２本の導体と接触するように形成されてもよい。 The low dielectric constant portion may be formed in contact with the two conductors.
前記低誘電率部が、空気層からなってもよい。 The low dielectric constant portion may include an air layer.
前記絶縁体が非発泡絶縁樹脂からなってもよい。 The insulator may be made of a non-foamed insulating resin.
前記絶縁体が発泡絶縁樹脂からなってもよい。 The insulator may be made of a foam insulating resin.
本発明によれば、小型で誘電損の小さいシールドケーブルを提供できる。 According to the present invention, it is possible to provide a shielded cable that is small and has a small dielectric loss.
以下、本発明の実施の形態を添付図面にしたがって説明する。 Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
図１は、本実施の形態に係るシールドケーブルの横断面図である。 FIG. 1 is a cross-sectional view of a shielded cable according to the present embodiment.
図１に示すように、シールドケーブル１は、平行に配置された２本（一対）の導体２と、２本の導体２を一括して覆う絶縁体３と、絶縁体３の外周を覆う外部導体４と、を備えている。外部導体４の外周にさらにシース（ジャケット）を備えてもよい。 As shown in FIG. 1, the shielded cable 1 includes two (a pair) conductors 2 arranged in parallel, an insulator 3 that collectively covers the two conductors 2, and an external that covers the outer periphery of the insulator 3. And a conductor 4. A sheath (jacket) may be further provided on the outer periphery of the outer conductor 4.
絶縁体３は、その外形が断面視で長円形状（２本の並列した平行な直線の端部同士を円弧により接続した形状）に形成されており、その外周に、隙間無く外部導体４が設けられている。シールドケーブル１は、断面視において、その幅方向（図示左右方向）の中心に対して線対称に形成されると共に、厚さ方向（図示上下方向）の中心に対して線対称に形成され、さらに、幅方向と厚さ方向の中心に対して点対称（１８０度回転対称）に形成されている。 The outer shape of the insulator 3 is formed in an oval shape (a shape in which two parallel parallel straight ends are connected by an arc) in a cross-sectional view, and the outer conductor 4 has no gap on the outer periphery thereof. Is provided. The shielded cable 1 is formed in line symmetry with respect to the center in the width direction (left-right direction in the figure) and in line symmetry with respect to the center in the thickness direction (up-down direction in the figure) in the cross-sectional view. They are formed in point symmetry (180 degree rotational symmetry) with respect to the center in the width direction and the thickness direction.
本実施の形態に係るシールドケーブル１では、２本の導体２間に、絶縁体３よりも誘電率が低い低誘電率部５を設けている。 In the shielded cable 1 according to the present embodiment, a low dielectric constant portion 5 having a dielectric constant lower than that of the insulator 3 is provided between the two conductors 2.
本実施の形態では、絶縁体３を非発泡絶縁樹脂とし、低誘電率部５を空気層とした。絶縁体３として非発泡絶縁樹脂を用いることで、発泡絶縁樹脂を用いた場合と比較して製造コストを低減できると共に、絶縁体３の寸法ばらつきを低減することが可能になる。なお、ここでは低誘電率部５を空気層としているが、低誘電率部５は絶縁体３よりの誘電率が低いものであればよく、例えば、絶縁体３に用いる絶縁樹脂にシリカ等を添加して誘電率を調整したものや、絶縁体３に用いる絶縁樹脂を発泡した発泡絶縁樹脂などを用いてもよい。ただし、小型化や誘電損を低減する観点からは、低誘電率部５はなるべく誘電率が小さいことが望ましく、誘電率の最も小さい空気層を低誘電率部５とすることが最も望ましい。絶縁体３に用いる絶縁樹脂としては、例えばＰＥ（ポリエチレン）が挙げられる。 In the present embodiment, the insulator 3 is a non-foamed insulating resin, and the low dielectric constant portion 5 is an air layer. By using a non-foamed insulating resin as the insulator 3, it is possible to reduce the manufacturing cost as compared to the case where a foamed insulating resin is used, and to reduce the dimensional variation of the insulator 3. Here, although the low dielectric constant portion 5 is an air layer, the low dielectric constant portion 5 only needs to have a lower dielectric constant than that of the insulator 3. For example, silica or the like is used for the insulating resin used for the insulator 3. A dielectric material whose dielectric constant is adjusted by addition, or a foamed insulating resin obtained by foaming an insulating resin used for the insulator 3 may be used. However, from the viewpoint of miniaturization and reduction of dielectric loss, it is desirable that the low dielectric constant portion 5 has a dielectric constant as small as possible, and the air layer having the smallest dielectric constant is most desirably the low dielectric constant portion 5. Examples of the insulating resin used for the insulator 3 include PE (polyethylene).
さらに、本実施の形態では絶縁体３として非発泡絶縁樹脂を用いているが、これに限らず、発泡絶縁樹脂を用いることも当然可能である。この場合、上述のように、絶縁体３として発泡絶縁樹脂を用いた場合と比較して、製造コストや寸法ばらつきが大きくなるものの、より小型でより誘電損の小さいシールドケーブル１を実現できる。 Furthermore, in the present embodiment, a non-foamed insulating resin is used as the insulator 3, but this is not a limitation, and a foamed insulating resin can naturally be used. In this case, as described above, the shielded cable 1 can be realized with a smaller size and a smaller dielectric loss, although the manufacturing cost and dimensional variation are larger than when the foamed insulating resin is used as the insulator 3.
本実施の形態では、低誘電率部５を２本の導体２の両者と接触するように形成しており、２本の導体２間に誘電率の高い絶縁体３が存在しない構成となっている。ここでは、低誘電率部５が空気層からなるので、両導体２はその一部（対向する導体２側の一部）が空気層に露出するように配置されることになる。差動成分の電界は主に導体２間に分布するので、両導体２に接触するように低誘電率部５を形成することで、差動成分に対する誘電損を低減することが可能になる。 In the present embodiment, the low dielectric constant portion 5 is formed so as to be in contact with both of the two conductors 2, and the insulator 3 having a high dielectric constant does not exist between the two conductors 2. Yes. Here, since the low dielectric constant portion 5 is formed of an air layer, both the conductors 2 are arranged so that a part thereof (a part on the side of the opposing conductor 2) is exposed to the air layer. Since the electric field of the differential component is mainly distributed between the conductors 2, the dielectric loss for the differential component can be reduced by forming the low dielectric constant portion 5 so as to contact both the conductors 2.
ここでは、低誘電率部５を断面視で矩形状に形成したが、低誘電率部５の形状はこれに限定されるものではなく、例えば、図２に示すように低誘電率部５を断面視で楕円形状に形成するなど、任意の形状とすることが可能である。 Here, the low dielectric constant portion 5 is formed in a rectangular shape in cross-sectional view, but the shape of the low dielectric constant portion 5 is not limited to this. For example, as shown in FIG. An arbitrary shape such as an elliptical shape in a cross-sectional view is possible.
低誘電率部５の幅ｗと高さｈは、所望のインピーダンス等に応じて適宜設定すればよいが、構造の対称性を保つため、低誘電率部５は対称形状に形成される必要がある。つまり、低誘電率部５は、シールドケーブル１の幅方向の中心に対して線対称であり、高さ方向の中心に対して線対称であり、かつ、幅方向と高さ方向の中心に対して点対称（１８０度回転対称）な形状に形成される。 The width w and height h of the low dielectric constant portion 5 may be appropriately set according to the desired impedance or the like. However, in order to maintain the symmetry of the structure, the low dielectric constant portion 5 needs to be formed in a symmetrical shape. is there. That is, the low dielectric constant portion 5 is line symmetric with respect to the center in the width direction of the shielded cable 1, is line symmetric with respect to the center in the height direction, and is centered with respect to the centers in the width direction and the height direction. It is formed into a point-symmetrical (180 degree rotationally symmetric) shape.
シールドケーブル１を製造する際には、図３（ａ）〜（ｃ）に示すように、導体２の周囲に絶縁体３の一部を押出成型したパーツ３１を２つ形成し、両パーツ３１の絶縁体３を融着接続し、その後、絶縁体３の周囲に外部導体４を形成するようにすればよい。パーツ３１の形状や融着接続の際の融着度合いによって、製造するシールドケーブル１の構造を任意に決定することが可能である。 When the shielded cable 1 is manufactured, as shown in FIGS. 3A to 3C, two parts 31 obtained by extruding a part of the insulator 3 around the conductor 2 are formed. Insulator 3 may be fusion spliced, and then outer conductor 4 may be formed around insulator 3. The structure of the shielded cable 1 to be manufactured can be arbitrarily determined according to the shape of the part 31 and the degree of fusion at the time of fusion splicing.
図３（ａ）では、幅方向の中央で２分割してパーツ３１を形成した場合、図３（ｂ）では、低誘電率部５の高さ方向の一方（図示下側）を覆う部位３ａを一方（図示右側）のパーツ３１に、他方（図示上側）を覆う部位３ｂを他方（図示左側）のパーツ３１に形成するよう分割した場合、図３（ｃ）では、低誘電率部５の高さ方向の両方を覆う部位３ａ，３ｂを一方（図示右側）のパーツ３１にまとめて形成するよう形成した場合をそれぞれ示しているが、どのように分割するかは適宜変更可能である。ただし、製造コストを低減するために、図３（ａ）や図３（ｂ）のように、２つのパーツ３１を同じ形状として部品点数を低減することがより望ましい。 In FIG. 3A, when the part 31 is formed by being divided into two at the center in the width direction, in FIG. 3B, a portion 3a that covers one of the low dielectric constant portions 5 in the height direction (the lower side in the drawing). Is divided into one (right side in the drawing) part 31 and a part 3b covering the other (upper side in the drawing) is formed on the other part (left side in the drawing), in FIG. Although the case where it forms so that the site | parts 3a and 3b which cover both of the height direction may be collectively formed in the part 31 of one side (illustration right side) is shown, it can change suitably how it divides | segments. However, in order to reduce the manufacturing cost, it is more desirable to reduce the number of parts by making the two parts 31 the same shape as shown in FIGS. 3 (a) and 3 (b).
なお、図３のような融着接続を行わずに、２本の導体２を押出機に一括して送り込み、両導体２の周囲に絶縁体３を一括して押出成型して、シールドケーブル１を製造することも可能である。この場合、押出成型時に低誘電率部５である空気層も同時に形成することになる。 It should be noted that the two conductors 2 are collectively fed into the extruder without performing the fusion splicing as shown in FIG. 3, and the insulator 3 is collectively extruded around the two conductors 2 so that the shielded cable 1 Can also be manufactured. In this case, an air layer which is the low dielectric constant portion 5 is also formed at the time of extrusion molding.
本実施の形態の作用を説明する。 The operation of the present embodiment will be described.
本実施の形態に係るシールドケーブル１では、２本の導体２間に、絶縁体３よりも誘電率が低い低誘電率部５を設けている。 In the shielded cable 1 according to the present embodiment, a low dielectric constant portion 5 having a dielectric constant lower than that of the insulator 3 is provided between the two conductors 2.
信号の差動成分の電界は主に導体２間に分布するので、導体２間に低誘電率部５を設けることで、差動成分に対して作用する誘電率を低くし、グランドに対する容量を小さくすることが可能となり、従来と比較して、同じインピーダンスとしたときのシールドケーブル１のサイズ（すなわち外部導体４よりも内側の断面積）を小さくすることが可能になると共に、差動成分に対する誘電損を小さくすることが可能になる。 Since the electric field of the differential component of the signal is mainly distributed between the conductors 2, by providing the low dielectric constant portion 5 between the conductors 2, the dielectric constant acting on the differential component is lowered, and the capacitance with respect to the ground is increased. Compared to the conventional case, the size of the shielded cable 1 (that is, the cross-sectional area inside the outer conductor 4) can be reduced when compared with the conventional case, and the differential component can be reduced. The dielectric loss can be reduced.
また、シールドケーブル１では、低誘電率部５を２本の導体２と接触するように形成しているため、両導体２間に誘電率が比較的高い絶縁体３が存在しないこととなり、さらなる小型化と誘電損の抑制が可能となる。 Further, in the shielded cable 1, since the low dielectric constant portion 5 is formed so as to be in contact with the two conductors 2, there is no insulator 3 having a relatively high dielectric constant between the two conductors 2. Miniaturization and suppression of dielectric loss are possible.
また、シールドケーブル１では、低誘電率部５を樹脂を用いた場合よりも誘電率が低い空気層で構成しているため、さらなる小型化と誘電損の抑制が可能となる。 Moreover, in the shielded cable 1, since the low dielectric constant part 5 is comprised by the air layer whose dielectric constant is lower than the case where resin is used, further size reduction and suppression of dielectric loss are attained.
具体的には、シールドケーブル１では、図４の従来のシールドケーブル４１と比較して、その断面積を３〜４割程低減できると共に、１０ＧＨｚでのＳＤＤ２１（差動モード利得）を０．８ｄＢ程度改善でき、その効果は大きい。 Specifically, the shielded cable 1 can reduce the cross-sectional area by 30 to 40% compared to the conventional shielded cable 41 of FIG. 4, and the SDD 21 (differential mode gain) at 10 GHz is 0.8 dB. It can be improved to some extent and the effect is great.
さらに、シールドケーブル１では、低誘電率部５である空気層が絶縁体３に覆われた構成となっているため空気層に外部導体４が侵入して構造の対称性が損なわれることを抑制できる。 Further, in the shielded cable 1, since the air layer which is the low dielectric constant portion 5 is covered with the insulator 3, it is possible to prevent the outer conductor 4 from entering the air layer and losing the symmetry of the structure. it can.
本発明は上記実施の形態に限定されるものではなく、本発明の趣旨を逸脱しない範囲で種々の変更を加え得ることは勿論である。 The present invention is not limited to the above-described embodiment, and it is needless to say that various modifications can be made without departing from the spirit of the present invention.
図１のシールドケーブル１において、絶縁体３として誘電率ε＝２．２７の非発泡のＰＥ（ＰＥソリッド）を用いた実施例１、および、絶縁体３として誘電率ε＝１．７６４の発泡ＰＥ（発泡度３５％）を用いた実施例２について、差動インピーダンスＺdiffを１００Ω、同相インピーダンスＺcommを３８Ωとしたときのシールドケーブル１の幅（長径）と高さ（短径）、および周波数１０ＧＨｚでのＳＤＤ２１（差動モード利得、ＳＤＤ２１＠１０ＧＨｚ）をシミュレーションにより求めた。 In the shielded cable 1 of FIG. 1, Example 1 using non-foamed PE (PE solid) having a dielectric constant ε = 2.27 as the insulator 3 and foaming having a dielectric constant ε = 1.664 as the insulator 3. For Example 2 using PE (foaming degree 35%), the width (major axis) and height (minor axis) of the shielded cable 1 when the differential impedance Z diff is 100Ω and the common-mode impedance Z comm is 38Ω, and SDD21 (differential mode gain, SDD21 @ 10 GHz) at a frequency of 10 GHz was obtained by simulation.
低誘電率部５（空気層）の幅ｗは、導体２間の中心間隔と同じ値とし、高さｈは０．６７ｍｍとした。具体的には、実施例１における低誘電率部５（空気層）の幅ｗは０．５９ｍｍ、高さｈは０．６７ｍｍとし、実施例２における低誘電率部５（空気層）の幅ｗは０．５５ｍｍ、高さｈは０．６７ｍｍとした。 The width w of the low dielectric constant portion 5 (air layer) was set to the same value as the center interval between the conductors 2 and the height h was set to 0.67 mm. Specifically, the width w of the low dielectric constant portion 5 (air layer) in the first embodiment is 0.59 mm and the height h is 0.67 mm, and the width of the low dielectric constant portion 5 (air layer) in the second embodiment. w was 0.55 mm, and height h was 0.67 mm.
また、比較のために、図４の従来のシールドケーブル４１において、絶縁体４３として誘電率ε＝２．２７の非発泡のＰＥ（ＰＥソリッド）を用いた比較例１、および、絶縁体４３として誘電率ε＝１．７６４の発泡ＰＥ（発泡度３５％）を用いた比較例２について、差動インピーダンスＺdiffを１００Ω、同相インピーダンスＺcommを３８Ωとしたときのシールドケーブル１の幅（長径）と高さ（短径）、および周波数１０ＧＨｚでのＳＤＤ２１（差動モード利得、ＳＤＤ２１＠１０ＧＨｚ）をシミュレーションにより求めた。結果をまとめて表１に示す。 For comparison, in the conventional shielded cable 41 of FIG. 4, as the insulator 43, a comparative example 1 in which non-foamed PE (PE solid) having a dielectric constant ε = 2.27 is used as the insulator 43. dielectric constant epsilon = 1.764 foamed PE Comparative example 2 using (foaming degree of 35%), differential impedance Z diff of 100 [Omega, shielded cable 1 having a width when the phase impedance Z comm and 38Omu (long diameter) And SDD21 (differential mode gain, SDD21 @ 10 GHz) at a height (minor axis) and a frequency of 10 GHz were obtained by simulation. The results are summarized in Table 1.
表１に示すように、比較例１，２の幅／高さは、それぞれ２．５７ｍｍ／１．３２ｍｍ、２．１６ｍｍ／１．１１ｍｍであったが、実施例１，２の幅／高さは、それぞれ２．００ｍｍ／１．１０ｍｍ、１．８０ｍｍ／１．００ｍｍであり、共に比較例１，２よりも小型なシールドケーブル１が実現できた。 As shown in Table 1, the width / height of Comparative Examples 1 and 2 were 2.57 mm / 1.32 mm and 2.16 mm / 1.11 mm, respectively. Are 2.00 mm / 1.10 mm and 1.80 mm / 1.00 mm, respectively, and a shielded cable 1 smaller than Comparative Examples 1 and 2 could be realized.
また、比較例１，２の周波数１０ＧＨｚでのＳＤＤ２１は、それぞれ−４．１５ｄＢ／ｍ、−３．７４ｄＢ／ｍであったが、実施例１，２の周波数１０ＧＨｚでのＳＤＤ２１は、それぞれ−３．４０ｄＢ／ｍ、−３．２３ｄＢ／ｍであり、共に比較例１よりも低損失なシールドケーブル１が実現できた。 In addition, the SDD 21 at the frequency of 10 GHz in Comparative Examples 1 and 2 was −4.15 dB / m and −3.74 dB / m, respectively. The SDD 21 at the frequency of 10 GHz in Examples 1 and 2 was −3 respectively. The shielded cable 1 was .40 dB / m and −3.23 dB / m, both of which were lower in loss than the comparative example 1.
実施例１と比較例２とを比較すれば分かるように、本発明によれば、絶縁体３として非発泡絶縁樹脂を用いた場合であっても、従来構造で絶縁体４３として発泡絶縁体を用いた場合よりも、小型化および低損失化が可能になることが分かる。 As can be seen from a comparison between Example 1 and Comparative Example 2, according to the present invention, even when a non-foamed insulating resin is used as the insulator 3, a foamed insulator is used as the insulator 43 in the conventional structure. It can be seen that the size and the loss can be reduced as compared with the case of using.
以上の結果より、２本の導体間に低誘電率部５である空気層を設けることで、小型で誘電損の小さいシールドケーブル１が得られることが確認できた。 From the above results, it was confirmed that the shield cable 1 having a small size and a small dielectric loss can be obtained by providing an air layer as the low dielectric constant portion 5 between the two conductors.
１ シールドケーブル
２ 導体
３ 絶縁体
４ 外部導体
５ 低誘電率部
1 Shielded cable 2 Conductor 3 Insulator 4 Outer conductor 5 Low dielectric constant part
Claims (5)
該２本の導体を一括して覆う絶縁体と、
該絶縁体の外周を覆う外部導体と、を備え、
前記２本の導体間に、前記絶縁体よりも誘電率が低い低誘電率部を設けた
ことを特徴とするシールドケーブル。 Two conductors arranged in parallel;
An insulator that collectively covers the two conductors;
An outer conductor covering the outer periphery of the insulator,
A shielded cable, wherein a low dielectric constant portion having a dielectric constant lower than that of the insulator is provided between the two conductors.
請求項１記載のシールドケーブル。 The shielded cable according to claim 1, wherein the low dielectric constant portion is formed so as to be in contact with the two conductors.
請求項１または２記載のシールドケーブル。 The shielded cable according to claim 1, wherein the low dielectric constant portion is formed of an air layer.
請求項１〜３いずれかに記載のシールドケーブル。 The shield cable according to claim 1, wherein the insulator is made of a non-foamed insulating resin.
請求項１〜３いずれかに記載のシールドケーブル。 The shield cable according to claim 1, wherein the insulator is made of foamed insulating resin.
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| Application Number | Priority Date | Filing Date | Title |
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| JP2013015528A JP2014146549A (en) | 2013-01-30 | 2013-01-30 | Shield cable |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023127622A1 (en) * | 2021-12-29 | 2023-07-06 | 株式会社オートネットワーク技術研究所 | Communication electric cable |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023127622A1 (en) * | 2021-12-29 | 2023-07-06 | 株式会社オートネットワーク技術研究所 | Communication electric cable |
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