Shielded cable

Abstract

To provide a shield cable provided with insulation coating excellent in heat dissipation characteristics and resistance to mechanical stress.SOLUTION: A shield cable 1 comprises: at least one wire 11 or cable 10; a shield 13 provided around the at least one wire 11 or cable 10 and composed of a plurality of strands 130 made of a metal material; and an insulating coating 14 provided around the shield 13 so as to be in direct and surface contact with the plurality of strands 130. The insulating coating 14 includes a base resin 141 made of an acid-modified fluororesin and an insulating heat-dissipating filler 142 contained in the base resin 141 and having at least one functional group of an NH2 group and an OH group on the surface.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a shielded cable. [Background technology]

[0002] Conventionally, there has been known an electric wire in which a core wire made of a conductor is insulated with a heat-dissipating insulating material having high thermal conductivity, which is formed by mixing vinyl chloride with one or more of silica, alumina, magnesium oxide, boron nitride, or beryllium oxide (see Patent Document 1).

[0003] According to the electric wire described in Patent Document 1, even if a current flows through the core wire and heat is generated in the insulating coating, the heat is not trapped in the insulating coating, which is made of a heat-dissipating insulating material, but can be dissipated to the outside. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 8-235939 Summary of the Invention [Problem to be solved by the invention]

[0005] For cables that require high heat resistance, such as endoscope cables that are sterilized at high temperatures before use, or cables used in narrow housings where heat dissipation is difficult, such as those for thin foldable PCs, it is preferable to use fluororesin, which has excellent heat resistance, as the insulating coating material for the sheath, jacket, etc.

[0006] However, fluororesin has poor wettability with fillers, and when a heat-dissipating filler is mixed in to improve heat dissipation properties, as in the electric wire of Patent Document 1, cracks may occur at the interface between the non-adhered fluororesin and the filler when deformation such as bending or twisting occurs. In other words, mixing a heat-dissipating filler into fluororesin reduces resistance to mechanical stress. For this reason, when using fluororesin as a material for insulating coating such as a sheath, it has been difficult to achieve both excellent heat dissipation properties and excellent resistance to mechanical stress.

[0007] An object of the present invention is to provide a shielded cable having an insulating coating that is excellent in both heat dissipation properties and resistance to mechanical stress. [Means for solving the problem]

[0008] In order to solve the above problems, the present invention provides a heat dissipating insulating material comprising at least one electric wire or cable, a shield formed around the at least one electric wire or cable and composed of a plurality of wires made of a metal material, and an insulating coating formed around the shield so as to be in direct and surface contact with the plurality of wires, wherein the insulating coating contains a base resin made of an acid-modified fluororesin and an insulating heat dissipating filler contained in the base resin and having at least one functional group of an NH2 group and an OH group present on the surface. death , The shield is a spirally wound shield in which the plurality of wires are spirally wound, adjacent wires of the plurality of wires are in contact with each other, and the insulating coating extends into recessed spaces between the adjacent wires, leaving gaps between the adjacent wires. Provide shielded cables. [Effects of the Invention]

[0009] According to the present invention, it is possible to provide a shielded cable having an insulating coating that is excellent in both heat dissipation characteristics and resistance to mechanical stress. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a radial cross-sectional view of an endoscope cable, which is an example of a shielded cable according to the present invention. [Figure 2]FIG. 2 is an enlarged cross-sectional view schematically showing the structure of a contact portion between a shield and a sheath in an endoscopic cable. DETAILED DESCRIPTION OF THE INVENTION

[0011] [Embodiment] The shielded cable according to the embodiment of the present invention is a shielded cable provided with an insulating coating such as a sheath or jacket that is excellent in both heat dissipation characteristics and resistance to mechanical stress. As an example, an endoscopic cable provided with a sheath as the insulating coating will be described below, but any shielded cable provided with an insulating coating having similar characteristics to the sheath described below is included in the shielded cable according to the embodiment of the present invention.

[0012] FIG. 1 is a radial cross-sectional view of an endoscopic cable 1, which is an example of a shielded cable of the present invention. The endoscopic cable 1, which is a micro-coaxial composite cable, contains three coaxial cables 10 and four electric wires 11, and these multiple coaxial cables 10 and electric wires 11 are bundled together with a holding tape 12. The outside of the holding tape 12 is covered with a conductive shield 13, such as a spirally wound shield in which multiple metal wires 130 are spirally wound, or a braided shield in which multiple wires 130 are braided. A sheath 14 is provided to cover the shield 13. A filler 15 may be provided at the center of the coaxial cables 10 and the electric wires 11 to stabilize their arrangement.

[0013] The coaxial cable 10 includes, for example, an inner conductor 101, an insulator 102 arranged around the inner conductor 101, an outer conductor 103 arranged around the insulator 102, and a jacket 104 arranged around the outer conductor 103.

[0014] The electric wire 11 includes, for example, a conductor 111 and an insulator 112 provided around the conductor 111. The shield 13 is, for example, a spirally wound shield in which a plurality of strands 130 made of a tin-containing copper alloy and having a diameter of 0.05 mm are spirally wound.

[0015] The sheath 14 is made of a resin coating material that includes a base resin 141 made of an acid-modified fluororesin and an insulating heat-dissipating filler 142 contained in the base resin 141. The sheath 14 is formed by tube extrusion or insertion extrusion. The sheath 14 is in direct, surface-to-surface contact with each of the wires 130 of the shield 13.

[0016] 2 is an enlarged cross-sectional view that schematically illustrates the structure of the contact portion between the shield 13 and the sheath 14. As shown in FIG. 2, the sheath 14 penetrates into the recessed space 131 between adjacent wires 130. Here, when the sheath 14 is formed by tube extrusion, it penetrates shallowly into the space 131, whereas when it is formed by insertion extrusion, it penetrates deeper into the space 131 than when it is formed by tube extrusion. As a result of the sheath 14 penetrating into the space 131, the sheath 14 comes into contact with each wire 130 not linearly but at a surface.

[0017] The acid-modified fluororesin constituting base resin 141 is a resin obtained by acid-modifying a fluororesin with excellent heat resistance, such as acid-modified PFA (tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer), ETFE (tetrafluoroethylene-ethylene copolymer), or FEP (tetrafluoroethylene-hexafluoropropylene copolymer (4.6 fluoride)). Compared to other fluororesins, PFA is particularly superior in heat resistance, insulation, and mechanical strength, making it preferable to use acid-modified PFA as base resin 141. Here, acid modification refers to copolymerizing an acid into a resin (polymerizing an acid into the molecular backbone of the resin) or bonding an acid to a side chain of the resin.

[0018] Heat dissipating filler 142 is a filler with high thermal conductivity that is mixed into base resin 141 to improve the heat dissipation characteristics of sheath 14. In order for heat dissipating filler 142 to effectively improve the heat dissipation characteristics of sheath 14 while maintaining the resistance of sheath 14 to mechanical stress, the concentration of heat dissipating filler 142 in sheath 14 is preferably 2% by mass or more and 12% by mass or less. If the concentration of heat dissipating filler 142 is less than 2% by mass, it is difficult to effectively improve the heat dissipation characteristics of sheath 14, and if it exceeds 12% by mass, there is a risk that resistance to mechanical stress, such as repeated bending characteristics and repeated twisting characteristics, may deteriorate.

[0019] Furthermore, the heat dissipating filler 142 is insulating because it is contained in the sheath 14, which requires high insulation. From the viewpoint of mechanical properties, the major axis of the heat dissipating filler 142 is preferably 50 nm or more and 1 μm or less. If the major axis of the heat dissipating filler 142 exceeds 1 μm, although there are few interfaces between the heat dissipating filler 142 and the base resin 141, each interface is large, and therefore, stress concentration can easily cause these interfaces to act as starting points for fracture. On the other hand, if the major axis of the heat dissipating filler 142 is less than 50 nm, coarse particles generated by aggregation of the heat dissipating filler 142 particles, etc., can act as starting points for fracture.

[0020] Thermally conductive fillers include boron nitride (BN) filler, aluminum nitride (AlN) filler, silicon carbide (SiC) filler, zinc oxide (ZnO) filler, and alumina (Al2O3) filler, and these have NH2 and OH groups on their surfaces.

[0021] Thus, for example, the heat dissipating filler 142 is composed of one or more of a boron nitride filler, an aluminum nitride filler, a silicon carbide filler, a zinc oxide filler, and an alumina filler.

[0022] In the sheath 14, C=O groups (carbonyl groups) contained in the acid of the acid-modified fluororesin that constitutes the base resin 141 react with NH groups or OH groups on the surface of the heat-dissipating filler 142, resulting in adhesion at the interface between the base resin 141 and the heat-dissipating filler 142. Therefore, even when the endoscopic cable 1 is deformed, such as bent or twisted, and mechanical stress is applied to the sheath 14, gaps that could be the starting point for cracks can be prevented from forming at the interface between the base resin 141 and the heat-dissipating filler 142. In other words, the sheath 14 has excellent heat-dissipating properties due to the heat-dissipating filler 142, while also having excellent resistance to mechanical stress.

[0023] More specifically, the NH2 groups on the surface of the heat-dissipating filler 142 react with the carbonyl groups contained in the acid of the acid-modified fluororesin that makes up the base resin 141 to form amides (amide reaction: -COOH + -NH2 = -CONH- + H2O), thereby providing adhesiveness at the interface between the base resin 141 and the heat-dissipating filler 142. In addition, the OH groups on the surface of the heat-dissipating filler 142 react with the carbonyl groups contained in the acid of the acid-modified fluororesin that makes up the base resin 141 to form hydrogen bonds, thereby providing adhesiveness at the interface between the base resin 141 and the heat-dissipating filler 142.

[0024] The adhesiveness exhibited by the reaction between NH groups and carbonyl groups is stronger than the adhesiveness exhibited by the reaction between OH groups and carbonyl groups. For this reason, it is particularly preferable to use one or both of boron nitride filler and aluminum nitride filler, which are nitride-based fillers with NH groups on their surfaces, as the thermally conductive filler 142. Furthermore, boron nitride filler has better moisture resistance than aluminum nitride filler, making it more preferable as the thermally conductive filler 142.

[0025] Furthermore, because the shield 13 is made of a metal material, a considerable number of OH groups are present on its surface. Therefore, when the sheath 14 is extrusion-molded, the OH groups on the surface of the shield 13 react with carbonyl groups contained in the acid of the acid-modified fluororesin that constitutes the base resin 141 to form hydrogen bonds. This improves the adhesiveness at the interface between the shield 13 and the sheath 14. Furthermore, the sheath 14 enters the recessed spaces 131 between adjacent wires 130, thereby increasing the contact area between the shield 13 and the sheath 14 and further enhancing the adhesiveness between the shield 13 and the sheath 14. The strong adhesiveness between the shield 13 and the sheath 14 reduces mechanical stress caused by displacement or movement of the wires 130 that constitute the shield 13 when the endoscopic cable 1 is deformed, such as by bending or twisting, and thus prevents the wires 130 from breaking, the sheath 14 from breaking, or the wires 130 from breaking through the sheath 14.

[0026] In the endoscopic cable 1, the jacket 104, which is the insulating coating of the coaxial cable 10, and the insulator 112, which is the insulating coating of the electric wire 11, may also be made of a resin material for coating having a base resin 141 and a heat dissipating filler 142, just like the sheath 14.

[0027] (Effects of the embodiment) According to the above embodiment, a resin coating material having excellent heat dissipation properties and resistance to mechanical stress can be provided, which comprises a base resin made of an acid-modified fluororesin and an insulating heat dissipation filler having at least one functional group, an NH group or an OH group, on the surface.

[0028] By using this resin coating material as the insulating coating material for the sheath, jacket, etc., it is possible to provide a shielded cable with an insulating coating that is excellent in both heat dissipation properties and resistance to mechanical stress. These shielded cables are suitable for use as shielded cables that require an insulating coating that has both high heat dissipation properties and high resistance to mechanical stress, such as endoscope cables that are sterilized at high temperatures before use, or cables used in narrow housings where heat dissipation is difficult, such as in thin PCs with folding screens. [Example]

[0029] As an example of a shielded cable according to the present invention, a composite 10-core cable was formed, and the tensile properties and heat conduction properties (heat dissipation properties) of the sheath as an insulating coating, as well as the bending properties of the cable were evaluated.

[0030] (Composite 10-core cable configuration) The composite 10-core cable of this example contains two 44 AWG coaxial cables, two 42 AWG coaxial cables, and six 36 AWG wires, twisted together and bound with a tape approximately 0.05 mm thick. The tape is then covered with a shield approximately 0.05 mm thick. The shield is a spirally wound shield consisting of 70 0.05 mm diameter silver-plated copper alloy wires wound in a spiral. The shield is then covered with a sheath approximately 0.10 mm thick and with an outer diameter of approximately 1.5 mm.

[0031] The 44 AWG coaxial cable has an outer diameter of approximately 0.26 mm and comprises an inner conductor consisting of seven twisted conductor wires each having a diameter of approximately 0.02 mm, an insulator having a thickness of approximately 0.05 mm arranged around the inner conductor, an outer conductor having a thickness of approximately 0.025 mm arranged around the insulator, and a jacket having a thickness of approximately 0.03 mm arranged around the outer conductor.

[0032] The 42 AWG coaxial cable has an outer diameter of approximately 0.29 mm and comprises an inner conductor consisting of seven twisted conductor wires each having a diameter of approximately 0.025 mm, an insulator having a thickness of approximately 0.05 mm arranged around the inner conductor, an outer conductor having a thickness of approximately 0.025 mm arranged around the insulator, and a jacket having a thickness of approximately 0.03 mm arranged around the outer conductor.

[0033] The 36 AWG wire has an outer diameter of approximately 0.25 mm, an inner conductor made of 19 twisted conductor wires each having a diameter of approximately 0.03 mm, and an insulator having a thickness of approximately 0.05 mm provided around the inner conductor.

[0034] In this example, three types of composite 10-core cables (referred to as Example 1, Comparative Example 1, and Comparative Example 2) with different sheath configurations were fabricated and evaluated. The configurations of Example 1, Comparative Example 1, and Comparative Example 2 are the same except for the sheath, as described above. The sheath configurations of Example 1, Comparative Example 1, and Comparative Example 2 are shown in Table 1 below.

[0035] [Table 1]

[0036] The values ​​in Table 1 indicate the concentration (mass%) of each material in the sheath. In addition, "AP-201" in Table 1 is Neoflon AP-201 manufactured by Daikin Industries, Ltd., "AP-202" is Neoflon AP-202 manufactured by Daikin Industries, Ltd., and "EA-2000" is Fluon+ EA-2000 manufactured by AGC Inc.

[0037] Among Example 1, Comparative Example 1, and Comparative Example 2, Example 1, which has an acid-modified fluororesin as the base resin and a boron nitride filler as the heat-dissipating filler, corresponds to the coating resin material of the embodiment of the present invention.

[0038] (Evaluation method) The tensile properties were evaluated by removing all components except the sheath from the finished composite 10-core cables (Example 1, Comparative Example 1, and Comparative Example 2), and conducting a tensile test on the sheath alone. The test was conducted under conditions of a gauge length of 50 mm and a pulling speed of 20 mm / min, and the breaking strength and breaking elongation were evaluated.

[0039] The thermal conductivity of the sheath was evaluated by preparing a sheet-shaped sample of the sheath material and measuring the thermal conductivity in accordance with ISO22007-2.

[0040] The bending properties were evaluated by a bending test in which a 100 g weight was hung from one end of the composite 10-core cable (Example 1, Comparative Example 1, and Comparative Example 2), and the cable was bent left and right at an angle of 90° or more along a pulley with a radius of 7.5 mm installed in a testing device. In this bending test, the cable was bent at a rate of 30 times per minute, and the appearance was checked every 10,000 bends, and the bending was continued up to 200,000 bends.

[0041] (Evaluation results) The evaluation results of the tensile properties and thermal conductivity properties (heat dissipation properties) of the sheaths and the bending properties of the cables for Example 1, Comparative Example 1, and Comparative Example 2 are shown in Table 2 below.

[0042] [Table 2]

[0043] The thermal conductivity characteristics of the sheath were almost the same in Example 1 and Comparative Example 2, and were superior to Comparative Example 1. This is thought to be because Example 1 and Comparative Example 2 contained a heat dissipating filler, while Comparative Example 1 did not.

[0044] Regarding the tensile properties of the sheath, the breaking strength of Comparative Example 2 was lower than that of Comparative Example 1. This is thought to be because Comparative Example 2 contains a heat-dissipating filler, which causes cracks to form at gaps at the interface between the base resin and the heat-dissipating filler. On the other hand, despite the inclusion of a heat-dissipating filler, the difference in breaking strength between Example 1 and Comparative Example 2 is not as large. This is thought to be because the base resin of Example 1 is made of an acid-modified fluororesin, which provides strong adhesion at the interface between the base resin and the heat-dissipating filler, generating stress at the interface and suppressing the formation of gaps that could serve as crack initiation points. The breaking elongation of Example 1 was smaller than those of Comparative Examples 1 and 2. This is thought to be due to the increased restraining force at the interface between the base resin and the heat-dissipating filler in Example 1, but the decrease in breaking elongation of Example 1 is thought to be at a level that does not pose a practical problem.

[0045] The bending properties of the cable were evaluated to be similar to those of the sheath. This is believed to be due to the same reasons as those for the sheath tensile properties. Specifically, the number of sheath breaks (the number of times the cable was bent before the sheath broke) in Comparative Example 2 was lower than that in Comparative Example 1. This is believed to be because Comparative Example 2 contained a thermally conductive filler, which caused cracks to form at gaps at the interface between the base resin and the thermally conductive filler. Furthermore, despite the inclusion of a thermally conductive filler, Example 1 had a similar number of sheath breaks to Comparative Example 1. This is believed to be due to the fact that the base resin in Example 1 was made of an acid-modified fluororesin, which provided strong adhesion at the interface between the base resin and the thermally conductive filler, suppressing the generation of gaps that could be the starting point for cracks. Furthermore, the base resin in Example 1 was made of an acid-modified fluororesin, which provided strong adhesion at the interface between the base resin and the shield. Furthermore, the sheath penetrated into the recessed spaces between the wires that make up the shield, further improving adhesion between the shield and sheath, thereby suppressing mechanical stress due to misalignment or movement of the wires that make up the shield.

[0046] As described above, Comparative Example 1 had excellent tensile and bending properties but poor thermal conductivity. Conversely, Comparative Example 2 had excellent thermal conductivity but poor tensile and bending properties. Of Example 1, Comparative Example 1, and Comparative Example 2, only Example 1 had a sheath that was excellent in both tensile and bending properties and thermal conductivity, i.e., excellent in both heat dissipation properties and resistance to mechanical stress. [Example]

[0047] As an example of a shielded cable according to the present invention, a composite 12-core cable was formed, and the tensile properties and heat conduction properties (heat dissipation properties) of the sheath as an insulating coating, as well as the bending properties and torsion properties of the cable were evaluated.

[0048] (Composite 12-core cable configuration) The composite 12-core cable of this example contains two 44 AWG coaxial cables, six 40 AWG coaxial cables, two 36 AWG wires, and two 32 AWG wires, twisted together and bound with a bundling tape approximately 0.01 mm thick. The bundling tape is covered with a shield approximately 0.05 mm thick. The shield is a spirally wound shield consisting of 80 0.05 mm diameter silver-plated copper alloy wires. The shield is then covered with a sheath approximately 0.1 mm thick and with an outer diameter of approximately 1.6 mm.

[0049] The 44 AWG coaxial cable has an outer diameter of approximately 0.25 mm and comprises an inner conductor consisting of seven twisted conductor wires each having a diameter of approximately 0.02 mm, an insulator having a thickness of approximately 0.05 mm arranged around the inner conductor, an outer conductor having a thickness of approximately 0.02 mm arranged around the insulator, and a jacket having a thickness of approximately 0.02 mm arranged around the outer conductor.

[0050] The 40 AWG coaxial cable has an outer diameter of approximately 0.36 mm and comprises an inner conductor consisting of seven twisted conductor wires each having a diameter of approximately 0.03 mm, an insulator having a thickness of approximately 0.075 mm arranged around the inner conductor, an outer conductor having a thickness of approximately 0.03 mm arranged around the insulator, and a jacket having a thickness of approximately 0.03 mm arranged around the outer conductor.

[0051] The 36 AWG wire has an outer diameter of approximately 0.23 mm, an inner conductor made of 19 twisted conductor wires each having a diameter of approximately 0.03 mm, and an insulator having a thickness of approximately 0.04 mm provided around the inner conductor.

[0052] The 32 AWG wire has an outer diameter of approximately 0.35 mm, an inner conductor made of 19 twisted conductor wires each having a diameter of approximately 0.05 mm, and an insulator having a thickness of approximately 0.05 mm provided around the inner conductor.

[0053] In this example, two composite 12-core cables were fabricated and evaluated: one containing a thermally conductive filler in the sheath (referred to as Example 2) and one not containing a thermally conductive filler in the sheath (referred to as Comparative Example 3). The sheath of Example 2 contained 96% by mass of acid-modified PFA (EA-2000) as the base resin and 4% by mass of boron nitride filler as the thermally conductive filler. The sheath of Comparative Example 3 consisted of only PFA (Neoflon AP-201).

[0054] (Evaluation method) The tensile properties were evaluated by removing all components except the sheath from the finished composite 12-core cables (Example 2 and Comparative Example 3), and conducting a tensile test on the sheath alone. The test was conducted under conditions of a gauge length of 50 mm and a pulling speed of 20 mm / min, and the breaking strength and breaking elongation were evaluated.

[0055] The thermal conductivity of the sheath was evaluated by preparing a sheet-shaped sample of the sheath material and measuring the thermal conductivity in accordance with ISO22007-2.

[0056] The bending properties were evaluated by a bending test in which a 100 g weight was hung from one end of the composite 12-core cable (Example 2, Comparative Example 3) and the cable was bent left and right at an angle of 90° or more around a pulley with a radius of 7.5 mm installed in a testing device. In this bending test, the cable was bent at a rate of 30 times per minute, and the appearance was checked every 10,000 bends. The bending test was continued up to 200,000 times for Example 2 and up to 150,000 times for Comparative Example 3.

[0057] The torsional properties were evaluated by a torsion test in which a 150 g weight was hung from one end of the composite 12-core cable (Example 2, Comparative Example 3), which was then placed in a testing device and twisted 180° or more to the left and right over a length of 200 mm. In this torsion test, the appearance was checked every 10,000 twists, and twisting was continued up to 200,000 times for Example 2 and up to 150,000 times for Comparative Example 3.

[0058] (Evaluation results) The evaluation results of the tensile properties and thermal conductivity properties (heat dissipation properties) of the sheaths, and the bending properties and torsional properties of the cables for Example 2 and Comparative Example 3 are shown in Table 3 below.

[0059] [Table 3]

[0060] The thermal conductivity of the sheath in Example 2 was superior to that in Comparative Example 3. This is thought to be because Example 2 contained a heat-dissipating filler, while Comparative Example 3 did not.

[0061] Regarding the tensile properties of the sheath, despite the fact that Example 2 contains a heat-dissipating filler, the breaking strength is equivalent to that of Comparative Example 3, and although the breaking elongation is not as good as that of Comparative Example 3, the difference is at a level that does not pose a problem in practical use. This is thought to be because the base resin of Example 2 is made of an acid-modified fluororesin, which results in strong adhesion at the interface between the base resin and the heat-dissipating filler, generating stress at the interface and suppressing the occurrence of gaps that could serve as starting points for cracks.

[0062] Although Example 2 contained a heat-dissipating filler, the bending and torsional properties of the cable were comparable to those of Comparative Example 3. This is thought to be because the base resin of Example 2 was made of an acid-modified fluororesin, which provided strong adhesion at the interface between the base resin and the heat-dissipating filler, suppressing the generation of gaps that could lead to cracks due to stress at the interface, and because the base resin of Example 2 was made of an acid-modified fluororesin, which provided strong adhesion at the interface between the base resin and the shield, and the sheath penetrated into the recessed spaces between the wires that make up the shield, further improving adhesion between the shield and sheath, thereby suppressing mechanical stress due to misalignment or movement of the wires that make up the shield.

[0063] As described above, it was confirmed that Example 2 had excellent tensile properties, bending properties, and torsional properties as well as heat conduction properties, that is, it had a sheath that was excellent in both heat dissipation properties and resistance to mechanical stress.

[0064] (Summary of the embodiment) Next, the technical ideas grasped from the above-described embodiments will be described by using the reference numerals and the like in the embodiments. However, the reference numerals and the like in the following description do not limit the components in the claims to the members and the like specifically shown in the embodiments.

[0065] [1] A shielded cable (1) comprising at least one electric wire (11) or cable (10), a shield (13) consisting of a plurality of wires (130) made of a metal material and arranged around the at least one electric wire (11) or cable (10), and an insulating coating (14) arranged around the shield (13) so as to be in direct and surface contact with the plurality of wires (130), wherein the insulating coating (14) has a base resin (141) made of an acid-modified fluororesin and an insulating heat-dissipating filler (142) contained in the base resin (141) and having at least one functional group of an NH group and an OH group present on the surface.

[0066] [2] The shielded cable (1) described in [1] above, wherein the heat dissipation filler (142) is composed of one or more of a boron nitride filler, an aluminum nitride filler, a silicon carbide filler, a zinc oxide filler, and an alumina filler.

[0067] [3] The shielded cable (1) according to [2] above, wherein the heat dissipation filler (142) is composed of one or both of a boron nitride filler and an aluminum nitride filler.

[0068] [4] The shielded cable (1) according to any one of the above [1] to [3], wherein the acid-modified fluororesin is acid-modified PFA, ETFE, or FEP.

[0069] [5] The shielded cable (1) according to the above [1], wherein the acid-modified fluororesin is acid-modified PFA, and the heat-dissipating filler (142) is a boron nitride filler.

[0070] [6] The shielded cable (1) according to any one of the above [1] to [5], wherein the concentration of the heat dissipating filler (142) in the insulating coating (14) is 2% by mass or more and 12% by mass or less.

[0071] [7] The shielded cable (1) according to any one of the above [1] to [6], wherein the major axis of the heat dissipating filler (142) is 50 nm or more and 1 μm or less.

[0072] [8] The shielded cable (1) according to any one of the above [1] to [7], wherein the insulating coating (14) penetrates into recessed spaces (131) between adjacent wires (130).

[0073] [9] The shielded cable (1) according to any one of the above [1] to [8], which includes a total of two or more of the electric wires (11) and / or the cables (10).

[0074] Although the embodiments and examples of the present invention have been described above, the present invention is not limited to the above embodiments and examples, and various modifications are possible within the scope of the gist of the invention. Furthermore, the above-described embodiments and examples do not limit the invention according to the claims. Furthermore, it should be noted that not all of the combinations of features described in the embodiments and examples are necessarily essential to the means for solving the problems of the invention. [Explanation of symbols]

[0075] 1 Endoscope cable 10 Coaxial Cable 11 Electric wire 12 Retaining tape 13 Shield 130 wire 14 Sheath 15 Intervention

Claims

1. at least one electrical wire or cable; a shield formed around the at least one electric wire or cable and composed of a plurality of wires made of a metal material; an insulating coating provided around the shield so as to be in direct and surface contact with the plurality of wires; Equipped with The insulating coating comprises a base resin made of an acid-modified fluororesin and a surface-modified NH ２ and an insulating heat-dissipating filler having at least one functional group selected from the group consisting of a hydroxyl group and an OH group. the shield is a spirally wound shield in which the plurality of wires are spirally wound, Adjacent wires of the plurality of wires are in contact with each other, The insulating coating extends into the recessed spaces between the adjacent wires, leaving gaps between the adjacent wires. Shielded cable.

2. The heat dissipating filler is composed of one or more of a boron nitride filler, an aluminum nitride filler, a silicon carbide filler, a zinc oxide filler, and an alumina filler.

2. The shielded cable according to claim 1.

3. The heat dissipating filler is composed of one or both of a boron nitride filler and an aluminum nitride filler.

3. The shielded cable according to claim 2.

4. The acid-modified fluororesin is acid-modified PFA, ETFE, or FEP; The shielded cable according to any one of claims 1 to 3.

5. the acid-modified fluororesin is acid-modified PFA, The heat-dissipating filler is a boron nitride filler.

2. The shielded cable according to claim 1.

6. The electric wire and / or the cable include two or more in total, The shielded cable according to any one of claims 1 to 5.

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