High frequency signal transmission cable
地域：
Tokyo
摘要
A high frequency signal transmission cable includes a conductor, an insulator provided over a periphery of the conductor, a plating layer provided over a periphery of the insulator, and a sheath provided over a periphery of the plating layer. A crack suppressing layer is provided between the insulator and the plating layer, in such a manner as to remain in contact with the insulator while being provided with the plating layer over an outer surface of the crack suppressing layer. The crack suppressing layer suppresses the occurrence of a cracking in the plating layer by bending while moving in a longitudinal direction of the cable relative to a bending of the insulator.
說明書
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The present invention is based on Japanese Patent Application No. 2019-123167 filed on Jul. 1, 2019, the entire contents of which are incorporated herein by reference.
The present invention relates to a high frequency signal transmission cable.
In recent years, for a productivity enhancing measure, the market for industrial robots (hereinafter also referred to as “robots”) including cobots (also called as “co-robots” or “collaborative robots”) or small articulated robots is expanding. As robot cables to be used in such a robot, a movable part cable designed to be wired in a movable part of the robot and a fixed part cable designed to connect the robot and a control device are used.
Note that Japanese Patent No. 3671729 has been disclosed as prior art document information relevant to the invention of the present application.
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- [Patent Document 1] Japanese Patent No. 3671729
權(quán)利要求
What is claimed is:1. A high frequency signal transmission cable, comprising:a conductor; an insulator provided over a periphery of the conductor; a plating layer provided over a periphery of the insulator; a sheath provided over a periphery of the plating layer,wherein a crack suppressing layer is provided between the insulator and the plating layer, in such a manner as to remain in contact with the insulator while being provided with the plating layer over an outer surface of the crack suppressing layer, wherein an attenuation in a band of not lower than 1.25 GHz and not higher than 6 GHz is not lower than 0.26 dB/m and not higher than 0.80 dB/m, wherein the crack suppressing layer, is unadhered to the insulator, wherein the plating layer is adhered to the crack suppressing layer, and wherein the crack suppressing layer suppresses an occurrence of a cracking in the plating layer by bending together with the plating layer while being integral and moving with the plating layer in a longitudinal direction of the cable relative to a bending of the insulator; a first braided shield disposed on an outer surface of the plating layer; and a second braided shield disposed on an outer surface of the first braided shield and on an inner surface of the sheath, wherein the second braided shield comprises metal wires having a larger outer diameter than metal wires of the first braided shield. 2. The high frequency signal transmission cable according to claim 1 , wherein the outer surface of the crack suppressing layer is roughened, the roughened outer surface of the crack suppressing layer is subjected to a corona discharge exposure treatment, and an electroless plating is applied to form the plating layer on an entire periphery of the crack suppressing layer. 3. The high frequency signal transmission cable according to claim 1 , wherein the crack suppressing layer is configured to freely move relative to the insulator. 4. The high frequency signal transmission cable according to claim 1 , wherein the crack suppressing layer and the plating layer are configured to freely move relative to the insulator. 5. A high frequency signal transmission cable, comprising:a conductor; an insulator provided over a periphery of the conductor; a plating layer provided over a periphery of the insulator; a sheath provided over a periphery of the plating layer,wherein a crack suppressing layer is provided between the insulator and the plating layer, in such a manner as to remain in contact with the insulator while being provided with the plating layer over an outer surface of the crack suppressing layer, wherein the crack suppressing layer is unadhered to the insulator, wherein the plating layer is adhered to the crack suppressing layer, and wherein the crack suppressing layer suppresses an occurrence of a cracking in the plating layer by bending together with the plating layer while being integral and moving with the plating layer in a longitudinal direction of the cable relative to a bending of the insulator; a first braided shield disposed on an outer surface of the plating layer; and a second braided shield disposed on an outer surface of the first braided shield and on an inner surface of the sheath, wherein the second braided shield comprises metal wires having a larger outer diameter than metal wires of the first braided shield. 6. The high frequency signal transmission cable according to claim 5 , wherein a thickness of the crack suppressing layer is less than a thickness of the insulator. 7. The high frequency signal transmission cable according to claim 5 , wherein the crack suppressing layer has a thickness of 0.10 mm or more and 0.20 mm or less. 8. The high frequency signal transmission cable according to claim 5 , wherein the plating layer comprises a metal having an electrical conductivity of 99% or more. 9. The high frequency signal transmission cable according to claim 5 , wherein the plating layer has a thickness of 2 μm or more and 5 μm or less. 10. The high frequency signal transmission cable according to claim 5 , wherein the conductor comprises a compressed stranded wire conductor comprising a plurality of wires stranded together and compressed to have a predetermined cross-sectional shape perpendicular to the longitudinal direction of the cable. 11. The high frequency signal transmission cable according to claim 5 , wherein a melting point of a resin to be used in the crack suppressing layer is lower than a melting point of a resin to be used in the insulator. 12. The high frequency signal transmission cable according to claim 5 , wherein the insulator comprises an irradiated cross-linked polyethylene, and the crack suppressing layer comprises a non-cress-linked polyethylene. 13. The high frequency signal transmission cable according to claim 5 , wherein the crack suppressing layer and the plating layer are configured to freely move relative to the insulator. 14. The high frequency signal transmission cable according to claim 5 , wherein the outer surface of the crack suppressing layer is roughened, the roughened outer surface of the crack suppressing layer is subjected to a corona discharge exposure treatment, and an electroless plating is applied to form the plating layer on an entire periphery of the crack suppressing layer. 15. The high frequency signal transmission cable according to claim 5 , wherein the crack suppressing layer is configured to freely move relative to the insulator, andwherein the crack suppressing layer is configured to remain in contact with the insulator with no space therebetween.
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