SHIELDED CONDITIONER WIRE

Abstract

A shielded conductor wire comprises an electrical conductor wire and a conductive nonwoven tape. The conductive nonwoven tape comprises a conductive nonwoven fabric and an adhesive layer. The adhesive layer adheres to the electrical conductor wire and to the conductive nonwoven tape, overlapping as it is spirally wound. The relationships S / tL ≤ 0.5 and (S1-S2) / tL ≤ 0.25 are satisfied, where t is the width of the spirally wound conductive nonwoven tape, L is the length of the conductive nonwoven tape, S is the area of ​​the adhesive layer in the conductive nonwoven tape, S1 is the area of ​​an overlapping section where the conductive nonwoven tape overlaps as it is spirally wound, and S2 is the area of ​​the adhesive layer in the overlapping section.

Description

BACKGROUND 1. Field of the invention

[0001] The present disclosure relates to a shielded conductive wire. 2. Description of the relevant state of the art

[0002] In the related art, a shielded conductive wire has been proposed in which a conductive nonwoven fabric comprising a nonwoven fabric and a metal layer formed on a surface of the nonwoven fabric is arranged around the outer periphery of an electrical conductive wire (see, for example, JP2019-75375A). The shielded conductive wire exhibits an electromagnetic shielding effect due to the metal layer of the conductive nonwoven fabric, while exhibiting relatively good stretchability and compressibility due to the properties of the nonwoven fabric, and can follow the bending of the electrical conductive wire. Such a conductive nonwoven fabric is provided with an adhesive layer on one surface to form a conductive nonwoven tape (see, for example, JP2021-140950A and JP2021-103775A), and can be fixed around the periphery of the electrical conductive wire using the adhesive layer.

[0003] However, if the conductive nonwoven tape is applied vertically around the circumference of the electrical conductor wire as described in JP2021-140950A and JP2021-103775A, an overlapped portion of the conductive nonwoven tape may come off during bending, and the shielding effect may be reduced.

[0004] When the conductive nonwoven tape is spirally wound, the overlapped portion also becomes spiral, making it difficult for the overlapped portion to open when bent. However, since an adhesive layer is inserted between the upper and lower conductive nonwoven fabrics in the overlapped portion, the conductive path also becomes spiral, resulting in a significant reduction in the shielding effect.

[0005] To solve such problems, the present applicant has made an invention related to Japanese Patent Application No. 2022-191625. In Japanese Patent Application No. 2022-191625, the conductive nonwoven fabric tape is spirally wound around the electrical conductor wire. For example, the conductive nonwoven fabric tape has an adhesive layer only at one end of the conductive nonwoven fabric. When the conductive nonwoven fabric tape is spirally wound, there is no adhesive layer between the overlapped portions of the conductive nonwoven fabric. As a result, the spirally wound conductive nonwoven fabric forms a conductive path along the longitudinal direction of the electrical conductor wire through the overlapped portions, thereby preventing a significant decrease in the shielding effect.

[0006] However, the above-mentioned conductive nonwoven tape requires the formation of an adhesive layer with a width corresponding to the width of the overlapped portion. This means that an adhesive layer is formed for each winding state and each desired electrical wire (electrical wire diameter, etc.), resulting in poor versatility (each product is unique). If the above-mentioned conductive nonwoven tape has an adhesive layer only at one end of the conductive nonwoven fabric in the width direction, the conductive nonwoven fabric may flow away from the electrical wire when used vertically, reducing the shielding effect. SUMMARY

[0007] The present disclosure has been made to solve such a problem in the related art, and an object of the present disclosure is to provide a shielded conductive wire capable of increasing the versatility of a conductive nonwoven tape and reducing a decrease in shielding effect.

[0008] According to one aspect of the present disclosure, there is provided a shielded conductive wire comprising: an electrical conductive wire; and a conductive nonwoven tape wound around the electrical conductive wire, in which: the conductive nonwoven tape includes a conductive nonwoven fabric that is a nonwoven fabric having electrical conductivity, and an adhesive layer formed on a surface of the conductive nonwoven fabric; in the conductive nonwoven tape, the adhesive layer is partially formed on the conductive nonwoven fabric; when the conductive nonwoven tape is wound in a spiral shape around the electrical conductive wire, the adhesive layer adheres to the electrical conductive wire and also adheres to the conductive nonwoven tape overlapping when wound in a spiral shape; and relationships of: S / tL≦0.5; and (S1-S2) / tL≦0.25 are satisfied, where t is a width of the spirally wound conductive nonwoven tape, L is a length of the conductive nonwoven tape, S is an area of ​​the adhesive layer in the conductive nonwoven tape, S1 is an area of ​​an overlapped portion in which the conductive nonwoven tape overlaps when the conductive nonwoven tape is spirally wound, and S2 is an area of ​​the adhesive layer in the overlapped portion.

[0009] According to the present disclosure, it is possible to provide a shielded conductive wire that increases the versatility of a conductive nonwoven tape and reduces a decrease in shielding effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The present disclosure will be more fully understood from the detailed description below and the accompanying drawings which are given by way of illustration only and thus are not limitative of the present disclosure, in which: Fig. 1 is a perspective view showing a shielded conductive wire according to an embodiment of the present disclosure; Fig. 2 is a configuration diagram showing a Fig. 1 shows a conductive nonwoven tape shown in which (a) shows a plane on which an adhesive layer is formed, (b) a cross section orthogonal to a tape longitudinal direction, and (c) a partially enlarged view of (b); Fig. 3 a cross-sectional view along a longitudinal direction of the Fig. 1 shown shielded conductor wire; Fig. 4 is an image diagram showing how a magnetic field is generated, in which (a) shows a state of a magnetic field in a reference example and (b) shows a state of a magnetic field in the present embodiment; Fig. 5 is a table showing Example 1 to Example 3 and Comparative Example 1 to Comparative Example 4; Fig. 6 is a diagram showing the shielding effect of shielded wires according to Example 2 and Comparative Examples 1 and 2; Fig. 7 is a table showing shielded lead wires when a conductive nonwoven fabric or conductive nonwoven tape is applied vertically; Fig. Fig. 8 is a diagram showing the shielding effect of shielded conductor wires according to Examples 1, 3 and 5 for vertical mounting; and Fig. 9 is a plan view of conductive nonwoven tapes according to modified examples, wherein (a) shows a first example, (b) a second example, and (c) a third example. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, the present disclosure will be described with reference to a preferred embodiment. The disclosure is not limited to the embodiments described below, and the embodiments can be appropriately changed without affecting the scope of the disclosure. In the embodiments described below, there may be portions where the illustration and description of a part of a configuration are omitted, and needless to say, a known or well-known technique is appropriately applied to the details of the omitted technique in a range where no contradiction occurs with the contents described below.

[0012] Fig. 1 is a perspective view showing a shielded conductor wire according to an embodiment of the present disclosure. As shown in Fig. 1, the shielded wire 1 according to the present embodiment comprises an electric wire 10 and a conductive nonwoven tape 20 spirally wound around the electric wire 10. In the shielded wire 1 of the embodiment shown in Fig. 1, the conductive nonwoven tape 20 is wound spirally, but is not limited to a spiral shape, and the conductive nonwoven tape 20 can be mounted vertically. The number of electrical wires 10 in Fig. 1 is one, but the number is not limited to one and can be two or more.

[0013] The electrical conductor wire 10 comprises a conductor 11, which is made of, for example, copper, aluminum or an alloy thereof, and an insulating sheath portion 12 covering the conductor 11. In the Fig. In the example shown in Figure 1, the conductor 11 of the electric wire 10 is a twisted wire obtained by twisting multiple wires together, but is not limited to this and may also be a solid wire. Furthermore, the covering portion 12 is assumed to be made of polyvinyl chloride (PVC), polypropylene (PP), or polyethylene (PE), but the material is not limited to these materials and may also be made of silicone, polyurethane, nylon, and the like.

[0014] Fig. 2 is a configuration diagram showing the Fig. 1 shows a conductive nonwoven tape 20, in which (a) shows a plane on which an adhesive layer is formed, (b) a cross section orthogonal to a tape longitudinal direction, and (c) a partially enlarged view of (b). As in (a) of Fig. 2 and (b) of Fig. 2, the conductive nonwoven tape 20 comprises a conductive nonwoven fabric 21 and an adhesive layer 22 provided on a surface (front or back) of the conductive nonwoven fabric 21.

[0015] As in (c) of Fig. 2, the conductive nonwoven fabric 21 comprises fibers 21a forming a nonwoven fabric and coated portions 21b. The nonwoven fabric is a sheet-shaped member in which the fibers 21a are intertwined without being woven. As shown in (c) of Fig. As shown in Figure 2, the fibers 21a of the nonwoven fabric are formed as multiple layers in the thickness direction due to the manufacturing process. The fibers 21a constituting the nonwoven fabric are made of, for example, polyethylene terephthalate (PET), PP, nylon, acrylic, glass fibers, carbon fibers, aramid fibers, polyarylate fibers, or the like.

[0016] The coated portion 21b is a conductive metal covering the fibers 21a constituting the nonwoven fabric. The coated portion 21b is made of, for example, copper, nickel, tin, silver, or an alloy of these metals. The coated portion 21b can be formed in a single layer on the fibers 21a constituting the nonwoven fabric or in multiple layers. Therefore, the coated portion 21b can be formed, for example, as copper (first layer) and tin (second layer) on the fibers 21a constituting the nonwoven fabric.

[0017] As in (a) of Fig. 2 and (b) of Fig. 2, the adhesive layer 22 is partially formed on a surface of the conductive nonwoven fabric 21. In the example shown in (a) of Fig. 2 and (b) of Fig. 2, the conductive nonwoven fabric tape 20 has two adhesive layers 22 formed along a longitudinal direction of the conductive nonwoven fabric tape 20. When the conductive nonwoven fabric tape 20 is divided into two equal regions in the width direction, each adhesive layer 22 is attached to one end side of each divided region. A first adhesive layer 22a of the adhesive layers 22 is formed at one end of the conductive nonwoven fabric 21 and extends in the longitudinal direction with a predetermined width. A second adhesive layer 22b is formed from the center slightly toward the other end of the conductive nonwoven fabric 21 and extends in the longitudinal direction with a predetermined width. As described above, a plurality of adhesive layers 22 are formed in linear shapes that are continuous at least in the longitudinal direction.

[0018] Fig. 3 is a cross-sectional view along a longitudinal direction of the Fig. 1. When the conductive nonwoven tape 20 is wound spirally around the electrical conductor wire 10, the adhesive layer 22 adheres as shown in Fig. 3, on the electrical conductor wire 10 and also on the conductive nonwoven tape 20, which is wound in a spiral overlapping manner. That is, in the Fig. 2, the first adhesive layer 22a adheres to the electrical conductor wire 10 when the conductive nonwoven tape 20 is wound. The second adhesive layer 22b adheres to the overlapped conductive nonwoven tape 20 in overlapped portions La where the conductive nonwoven tapes 20 overlap each other. In addition, the second adhesive layer 22b is provided in a part of the overlapped portion La and not in the remaining part. Accordingly, in the conductive nonwoven tape 20 shown in Fig. 2, the conductive nonwoven fabrics 21 are brought into contact with each other and are conductive in the conductive sections 23 in which the adhesive layer 22 is not formed.

[0019] The shielded conductive wire 1 according to the present embodiment has improved shielding performance compared to the reference example in which the adhesive layer 22 is provided on the entire conductive nonwoven fabric 21.

[0020] Fig. Fig. 4 is an image diagram showing how a magnetic field is generated, in which (a) shows a state of a magnetic field in a reference example and (b) shows a state of a magnetic field in the present embodiment. First, as shown in (a), Fig. 4 and (b) of Fig. As shown in Figure 4, a current flows in the electric wire 10 in a direction in which the conductor 11 extends. Therefore, a magnetic field MF1 (see dashed line) is generated in a direction orthogonal to the current.

[0021] In the Fig. In the example shown in (a) of Figure 4, the adhesive layer 22 is applied to the entire conductive nonwoven fabric 21. Therefore, the adhesive layer 22 is located between the conductive nonwoven fabrics 21 in the overlapped portions La where the conductive nonwoven tape overlaps. Accordingly, the conductive nonwoven tape shown in the reference example forms a conductive path CP in a spiral shape. In this case, a magnetic field MF2 (see solid line) is generated in a direction orthogonal to the spiral direction on the conductive nonwoven tape side. The magnetic field MF2 cannot cancel the magnetic field MF1 generated by the current flowing through the conductor 11.

[0022] On the other hand, in the conductive nonwoven tape 20 according to the present embodiment, as described with reference to Fig. 3, the conductive nonwoven fabrics 21 are electrically connected to each other via the conductive portion 23 in the overlapped portion La. Therefore, the conductive nonwoven tape 20 forms, as shown in (b) of Fig. 4, a conductive path CP along the longitudinal direction of the electric wire 10. Accordingly, the shielded wire 1 according to the present embodiment can generate the magnetic field MF2 (see solid line) that cancels the magnetic field MF1 (see dashed line) generated by the current flowing through the conductor 11.

[0023] Particularly, in the shielded conductive wire 1 according to the present embodiment, the proportions of the adhesive layer 22 and the conductive portion 23 are optimized, and the magnetic field MF2 that cancels the magnetic field MF1 is appropriately generated, whereby the shielding effect can be optimally exhibited.

[0024] Specifically, in the shielded wire 1 according to the present embodiment, when a width of the conductive nonwoven tape is 20 t (see (a) of Fig. 2 and (b) of Fig. 2), a length of the conductive nonwoven tape is 20 L (see (a) of Fig. 2) and a surface of the adhesive layer 22 in the conductive nonwoven tape 20 S, [Math 1] S / tL≦0.5 tL denotes the total area of ​​the conductive nonwoven tape 20. Accordingly, as shown in formula (1), in the conductive nonwoven tape 20 according to the present embodiment, an area ratio of the adhesive layer 22 is 50% or less.

[0025] While the conductive nonwoven tape 20 is spirally wound around the electric wire 10, in the shielded electric wire 1 according to the present embodiment, when an area of ​​the overlapped portion La in which the conductive nonwoven tape 20 overlaps each other is defined as S1, and an area of ​​the adhesive layer 22 in the overlapped portion La is defined as S2, [Maths 2] (S1−S2) / tL≧0.25 Here, S1 - S2 is obtained by subtracting the area of ​​the adhesive layer 22 from the area of ​​the overlapped portion La and can be referred to as the area of ​​the conductive portion 23. As described above, tL denotes the total area of ​​the conductive nonwoven tape 20. Thus, formula (2) represents a ratio between the conductive portion 23 in the overlapped portion La and the entire conductive nonwoven tape 20. That is, formula (2) states that the conduction ratio is 25% or more when the conductive nonwoven tape 20 is spirally wound around the electric wire 10.

[0026] By satisfying the above formula (1) and formula (2), the conductive nonwoven tape 20 according to the present embodiment can form the conductive path CP extending in the longitudinal direction of the electric wire 10 as shown in (b) of Fig. 4. Since the proportions of the adhesive layer 22 and the conductive portion 23 are also optimized, the magnetic field MF1 generated by the current flowing through the conductor 11 can be easily canceled by the magnetic field MF2 generated by the conductive path CP while the conductive nonwoven tape 20 is properly attached to the electrical wire 10.

[0027] In the Fig. In the example shown in Figure 3, the conductive nonwoven tape 20 is wound halfway. However, the shielded conductive wire 1 according to the present embodiment is not limited to halfway winding and can be of any type as long as Formula (1) and Formula (2) are satisfied. In particular, the shielded conductive wire 1 according to the present embodiment can use any conductive nonwoven tape 20 as long as Formula (1) and Formula (2) are satisfied. Accordingly, it is difficult for the conductive nonwoven tape 20 to be unique to an article, as disclosed in Japanese Patent Application No. 2022-191625, and versatility is increased.

[0028] The conductive nonwoven fabric tape 20 used for the above-described spiral winding is formed by appropriately forming the adhesive layer 22 on the conductive nonwoven fabric 21 with a width greater than t, and then cutting the conductive nonwoven fabric 21 along the longitudinal direction to have a width of t. Furthermore, when the conductive nonwoven fabric tape 20 is used for vertical attachment, the conductive nonwoven fabric tape 20 can be processed into a product without being cut with a width greater than t. A method for producing the conductive nonwoven fabric tape 20 is not limited to this. For example, the conductive nonwoven fabric tape 20 used for spiral winding can be formed by, for example, cutting the conductive nonwoven fabric 21 to the width t in advance and then applying the adhesive layer 22 thereto.

[0029] Examples and comparative examples are described below. Fig. 5 is a table showing Example 1 to Example 3 and Comparative Example 1 to Comparative Example 4.

[0030] As in Fig. As shown in Figure 5, the conductive nonwoven tape in the shielded conductor wire according to Example 1 has two adhesive layers extending in the longitudinal direction. Similar to the two adhesive layers shown in Fig. Of the adhesive layers shown in Figure 2, one is provided at one end in the width direction of the conductive nonwoven fabric tape, and the other is provided slightly toward the other end of the conductive nonwoven fabric tape from the center in the width direction. Furthermore, in the conductive nonwoven fabric tape according to Example 1, the conduction ratio indicated by formula (2) is 35%, and the adhesion ratio indicated by formula (1) is 30%. An overlap width (width of the overlapped portion) is set to 1 / 2 of one end of the conductive nonwoven fabric tape (the area of ​​the overlapped portion is 1 / 2 of the total area). The shielding resistance of such a spirally wound conductive nonwoven fabric tape was 2.27 [Ω / m].

[0031] In the shielded conductor shown in Example 2, the conductive nonwoven tape is similar to that in Example 1, but the width of the adhesive layer is larger. The conduction ratio given in Formula (2) is 25%, and the adhesion ratio given in Formula (1) is 50%. The overlap width is set to 1 / 2 of one end of the conductive nonwoven tape. The shielding resistance of such a spirally wound conductive nonwoven tape was 2.29 [Ω / m].

[0032] In the shielded conductor wire shown in Example 3, the conductive nonwoven tape is similar to that in Example 2, but the conduction ratio shown in Formula (2) is 25% and the adhesion ratio shown in Formula (1) is 50%. However, one adhesive layer is formed in the center of one end side (one end half in the width direction), and the other adhesive layer is formed in the center of the other end side (the other end half in the width direction). The shielding resistance of such a spirally wound conductive nonwoven tape was 2.61 [Ω / m].

[0033] In the shielded conductor wire shown in Comparative Example 1, the conductive nonwoven fabric (which has no adhesive layer and is not a conductive nonwoven tape) does not have an adhesive layer. Therefore, in the conductive nonwoven fabric according to Comparative Example 1, the conduction ratio indicated by formula (2) is 50%, and the adhesion ratio indicated by formula (1) is 0%. The overlap width is set to 1 / 2 from one end. The shielding resistance of such a spirally wound conductive nonwoven fabric was 1.52 [Ω / m].

[0034] In the shielded conductor wire shown in Comparative Example 2, the conductive nonwoven tape is similar to that in Example 2, but the width of the adhesive layer is larger. Therefore, in Comparative Example 2, the conduction ratio given by Formula (2) is 15%, and the adhesion ratio given by Formula (1) is 70%. The overlap width is set to 1 / 2 from one end. The shielding resistance of such a spirally wound conductive nonwoven tape was 4.3 [Ω / m].

[0035] In the shielded conductor wire shown in Comparative Example 3, the conductive nonwoven fabric (which has no adhesive layer and is not a conductive nonwoven tape) is the same as that used in Comparative Example 1 (without an adhesive layer). In the conductive nonwoven fabric according to Comparative Example 3, the conduction ratio indicated by formula (2) is 25%, and the adhesion ratio indicated by formula (1) is 0%. In Comparative Example 3, the overlap width is set to 1 / 4 from one end. The shielding resistance of such a spirally wound conductive nonwoven fabric was 1.48 [Ω / m].

[0036] In the shielded wire shown in Comparative Example 4, the conductive nonwoven tape has four adhesive layers extending in the longitudinal direction. When the conductive nonwoven tape is divided into four equal regions in the width direction, each of the four adhesive layers is located on one end side of each divided region. Furthermore, in the conductive nonwoven tape according to Comparative Example 4, the conduction ratio indicated by formula (2) is 13%, and the adhesion ratio indicated by formula (1) is 50%. The overlap width is set to 1 / 4 from one end. The shielding resistance of such a spirally wound conductive nonwoven tape was 4.34 [Ω / m].

[0037] In the illustration above, an 8d coaxial cable was used for the electrical conductor inside the conductive nonwoven tape. Furthermore, the adhesive layer was created using double-sided adhesive tape (product number #8080) from DIC Corporation. The conductive nonwoven tape was 20 mm wide. A grounding part was also attached by wrapping a connector around it and then tightening a tape over the conductive nonwoven tape. The tension force of the tensioning tape ranges from 165 N to 220 N.

[0038] Fig. Figure 6 is a diagram showing the shielding effect of shielded wires according to Example 2 and Comparative Examples 1 and 2. In Fig. 6, the shielding effects of Examples 1 and 3 are the same as those of Example 2, so the illustration is omitted. Similarly, the shielding effect of Comparative Example 3 is the same as that of Comparative Example 1, and the shielding effect of Comparative Example 4 is the same as that of Comparative Example 2, so their illustration is omitted.

[0039] As in Fig. As shown in Figure 6, the shielded conductor wire according to Comparative Example 1 exhibits the best shielding effect. This is because the conductive nonwoven fabric has no adhesive layer, and thus a longitudinally extending conductive path can be formed appropriately. However, in the shielded conductor wire according to Comparative Example 1, since the conductive nonwoven fabric is used without an adhesive layer, the overlapped portion opens upon bending, and a good shielding effect, as shown in Figure 6, is not achieved. Fig. 6 cannot be achieved. If a conductive nonwoven fabric without an adhesive layer is used, the position of the conductive nonwoven fabric may also become unstable, and a good shielding effect may no longer be achieved after long-term use, etc.

[0040] Furthermore, the shielded electric wire according to Example 2 has the second-best shielding effect after the shielded electric wire according to Comparative Example 1. This is because the shielded electric wire according to Example 2 satisfies the conditions of Formula (1) and Formula (2), and therefore the shielding resistance is also in a range of 1.5 [Ω / m] or more and 4.0 [Ω / m] or less, and a longitudinally extending conductive path can be formed relatively well. In addition, the adhesive layer adheres not only to the electric wire but also to the conductive nonwoven tape. Accordingly, it is possible to reduce the possibility of the overlapped portion being opened at the time of bending or the portion of the conductive nonwoven tape being displaced, and a relatively good shielding effect is easily achieved even during bending, long-term use, and the like.

[0041] The shielded conductor wire according to Comparative Example 2 has the lowest shielding effect. The shielded conductor wire according to Comparative Example 2 does not satisfy any of the conditions of Formulas (1) and (2), and the shielding resistance exceeds 4.0 [Ω / m]. Even if a conductive path can be formed in the longitudinal direction, it is insufficient to cancel the magnetic field, and it is difficult to say that a good shielding effect is achieved.

[0042] Fig. Figure 7 is a table showing shielded lead wires when a conductive nonwoven fabric or conductive nonwoven tape is applied vertically.

[0043] First, as in Fig. As shown in Figure 7, a shielded wire according to Example 1 used a conductive nonwoven fabric without an adhesive layer as the shielding layer for vertical attachment. Therefore, the adhesion ratio indicated in Formula (1) is 0%. The shielding resistance of such a vertically attached conductive nonwoven fabric was 0.51 [Ω / m].

[0044] In a shielded wire for vertical mounting according to Example 2, the conductive nonwoven tape has three adhesive layers extending longitudinally. When the conductive nonwoven tape is divided into three equal regions in the width direction, each of the three adhesive layers is located on one end side of each divided region. Furthermore, in the conductive nonwoven tape for vertical mounting according to Example 1, the adhesion ratio given by Formula (1) is 30%. The shielding resistance of such a conductive nonwoven tape was 0.38 [Ω / m].

[0045] In the shielded conductor wire according to Example 3 for vertical mounting, the conductive nonwoven tape is similar to that of Example 2 for vertical mounting, but the width of the adhesive layer is larger, and the adhesion ratio given in Formula (1) is 50%. The shielding resistance of such a conductive nonwoven tape was 0.46 [Ω / m].

[0046] In a shielded conductor wire according to Example 4 for vertical mounting, the conductive nonwoven tape has an adhesive layer extending longitudinally. One adhesive layer is formed from one end of the conductive nonwoven tape to the other end. For the conductive nonwoven tape according to Example 4 for vertical mounting, the adhesion ratio specified in Formula (1) was 50%, and the shielding resistance of the vertically mounted conductive nonwoven tape was 0.52 [Ω / m].

[0047] In a shielded conductor wire according to Example 5 for vertical mounting, the conductive nonwoven tape is similar to that of Example 3 for vertical mounting, but the width of the adhesive layer is larger, and the adhesion ratio shown in Formula (1) is 70%. The shielding resistance of such a conductive nonwoven tape was 1.15 [Ω / m].

[0048] Fig. Figure 8 is a diagram showing the shielding effect of shielded wires according to Examples 1, 3, and 5 for vertical mounting. Fig. 8, the shielding effects of examples 2 and 4 for vertical mounting are the same as those of example 3 for vertical mounting, so the illustration is omitted.

[0049] As in Fig. As shown in Figure 8, the shielded wire according to Example 1 for vertical mounting exhibits the best shielding effect. In this respect, the shielded wire according to Example 3 for vertical mounting also exhibits a shielding effect as good as that of the shielded wire according to Example 1 for vertical mounting. Furthermore, the shielded wire according to Example 5 for vertical mounting exhibits a lower shielding effect than that of Examples 1 and 3 for vertical mounting.

[0050] It is clear here that, among Examples 1 to 5 for vertical mounting, the conductive nonwoven tapes shown in Examples 2 to 4 for vertical mounting satisfy formula (1). For the conductive nonwoven tapes according to Examples 2 to 4 for vertical mounting, formula (2) can be satisfied depending on the overlap ratio of the spiral winding (formula (2) can be satisfied depending on the design of the overlapped portion). It was found that the conductive nonwoven tapes shown in Examples 2 to 4 for vertical mounting have the same shielding effect as the conductive nonwoven fabric of Example 1 for vertical mounting, even when mounted vertically, and are therefore very versatile.

[0051] In this way, in the shielded conductive wire 1 of the present embodiment, the adhesive layer 22 adheres to the electrical conductive wire 10 and also to the conductive nonwoven tape 20, which is spirally wound and arranged in an overlapping manner. Therefore, the conductive nonwoven tape 20 adheres to the electrical conductive wire 10 to prevent its displacement and the like, and also adheres to the conductive nonwoven tape 20 to maintain the wound state. When the width of the conductive nonwoven tape 20 is t, the length of the conductive nonwoven tape 20 is L, and the area of ​​the adhesive layer 22 in the conductive nonwoven tape 20 is S, the shielded conductive wire 1 satisfies formula (1). This allows the ratio of the adhesive layer 22 in the conductive nonwoven tape 20 to be optimized. When the area of ​​the overlapped portion La is S1 and the area of ​​the adhesive layer 22 in the overlapped portion La is S2, formula (2) is satisfied.Therefore, the range (S1-S2) in which the current conduction through the conductive portion 23 in the overlapped portion La is ensured is optimized, and the conductive path CP in the longitudinal direction is secured even when the conductive nonwoven tape 20 is spirally wound. In particular, the conductive nonwoven tape 20 is not limited to a tape in which the adhesive layer 22 is formed only at one end, and as long as the formulas (1) and (2) are satisfied, it is not particularly limited in its shape and the like, and is unlikely to be unique, and depending on the product, it can be used in a vertical arrangement. Therefore, it is possible to provide a shielded conductor wire 1 that increases the versatility of a conductive nonwoven tape 20 and reduces a decrease in shielding effect.

[0052] Furthermore, the conductive nonwoven tape 20 has a plurality of adhesive layers 22 formed continuously and linearly at least in the longitudinal direction. Therefore, it is possible to provide the shielded electric wire 1 in which the adhesive layer 22 can be easily formed on the conductive nonwoven fabric 21, and the conductive nonwoven tape 20 can be properly wound around the electric wire so that it cannot be easily peeled off even when the conductive nonwoven tape 20 is vertically applied.

[0053] Although the present disclosure has been described above based on the embodiments, the present disclosure is not limited to the above-described embodiments, and changes may be made without departing from the gist of the present disclosure, or publicly known or known techniques may be appropriately combined.

[0054] Fig. Fig. 9 is a plan view of conductive nonwoven tapes according to modified examples, wherein (a) shows a first example, (b) a second example, and (c) a third example. As in (a) of Fig. As shown in FIG. 9, a conductive nonwoven tape 20a is not limited to the case where the plurality of adhesive layers 22 extend along the longitudinal direction, and may be configured to include elements extending at least in the longitudinal direction, for example, in an oblique direction. This also facilitates the formation of the adhesive layer 22 on the conductive nonwoven fabric 21, for example, by using double-sided adhesive tape, and also enables the conductive nonwoven tape 20a to be properly wound around the electrical wire 10 so that it is not easily peeled off even if the conductive nonwoven tape 20a is attached vertically.

[0055] As in (b) of Fig. 9, in a conductive nonwoven fabric tape 20b, the adhesive layer 22 may be formed discontinuously and at equal intervals in the longitudinal direction. Incidentally, the equal interval is not necessarily limited to the case where the longitudinally separated adhesive layers 22 are arranged at regular intervals. For example, the same interval includes the case where the first and second adhesive layers 22, which are longitudinally separated, are arranged at a first interval, the second and third adhesive layers 22, which are longitudinally separated, are arranged at a second interval, and this is repeated. This is because even if the adhesive layer 22 is not formed continuously, the same effect can be achieved if the formulas (1) and (2) are satisfied.

[0056] As in (c) of Fig. As shown in Figure 9, in a conductive nonwoven tape 20c, the conductive sections 23 can be formed discontinuously and at equal intervals in the longitudinal direction. Here, the same interval as in (b) of Fig. 9. Even if the conductive portion 23 is discontinuous, the same effect can be achieved if the formulas (1) and (2) are satisfied. QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] JP 2019-75375A

[0002] JP 2021-140950A [0002, 0003] JP 2021-103775A [0002, 0003] JP 2022-191625 [0005, 0027]

Claims

[1] A shielded conductor wire (1) comprising: an electrical conductor wire (10); and a conductive nonwoven tape (20) wound around the electrical conductor wire (10), wherein the conductive nonwoven tape (20) comprises a conductive nonwoven fabric (21) which is a nonwoven fabric with electrical conductivity, and an adhesive layer (22) formed on a surface of the conductive nonwoven fabric (21), wherein in the conductive nonwoven tape (20), the adhesive layer (22) is partially formed on the conductive nonwoven fabric (21), wherein, when the conductive nonwoven tape (20) is wound in a spiral shape around the electrical conductor wire (10), the adhesive layer (22) adheres to the electrical conductor wire (10) and also to the conductive nonwoven tape (20), which overlaps when wound in a spiral shape, and where relationships of: S / tL≦0.5; and (S1−S2) / tL≧0.25 are fulfilled, where t is a width of the conductive nonwoven tape (20) wound in a spiral shape, L is a length of the conductive nonwoven tape (20), S is an area of ​​the adhesive layer (22) in the conductive nonwoven tape (20), S1 is an area of ​​an overlapped portion where the conductive nonwoven tape (20) overlaps when the conductive nonwoven tape (20) is wound in a spiral shape, and S2 is an area of ​​the adhesive layer (22) in the overlapped portion. [2] Shielded conductor wire (1) according to claim 1, wherein the adhesive layer (22) comprises a plurality of adhesive layers, and wherein in the conductive nonwoven tape (20) the plurality of adhesive layers are formed continuously and linearly at least in one longitudinal direction. [3] The shielded conductive wire (1) according to claim 1, wherein in the conductive nonwoven fabric tape (20), the adhesive layer (22) or a conductive portion (23) in which the adhesive layer (22) is not formed is formed discontinuously and at equal intervals in a longitudinal direction.

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