cable

Abstract

It is an object of the present invention to provide an insulated cable which is suitable for sliding use while having improved withstand voltage characteristics required for reducing the diameter of the cable. The object of the present invention is achieved by providing an insulated cable characterized in that the insulated cable comprises: a conductor; and an insulator formed on the conductor by a plurality of resin layers, each of which contains the same kind of fluororesin, in the above-mentioned Among the resin layers, the difference between the refractive index of the resin layer with the largest refractive index and the resin layer with the smallest refractive index is 0.03 or less, and the layer thickness of the outermost resin layer of the above-mentioned insulator is 0.03 mm or less. The wall thickness unevenness (coefficient of variation CV) of the above-mentioned insulator in a cross section perpendicular to the longitudinal direction is 0.035 or less.

Description

technical field [0001] The present invention relates to cables, and in particular, relates to insulated cables suitable for sliding use such as robot cables and having excellent withstand voltage characteristics. Background technique [0002] Fluororesins are resins that have excellent characteristics such as high insulation durability, excellent heat resistance, oil resistance, and chemical resistance, and the smallest dielectric constant among plastic insulators. Fluorine resins are preferably used as insulators of insulated wires used for wiring of electric and electronic equipment, especially robot cables and the like. For these applications, insulated cables are required to be more flexible and have smaller diameters as equipment becomes smaller and more functional. However, if the diameter is reduced, the mechanical strength such as wear resistance will decrease. [0003] In order to improve the flexibility of cables, for example, there is an insulated wire in which ...

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Problems solved by technology

[0004] When the diameter of the cable is reduced, the total thickness of the insulating layer on the conductor becomes thinner, which not only reduces the mechanical strength such as abrasion resistance, but also reduces the withstand voltage characteristics, making it impossible to fully obtain the characteristics required for robot cables.

However, the purpose of the above insulated wires is to improve the mechanical properties such as the abrasion resistance and flexibility of the insulating layer of the cable, and there has been no study of a cable that simultaneously achieves a reduction in diameter and an improvement in withstand voltage characteristics.

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