Signal transmission cable
A signal transmission cable includes a signal line, an insulation layer covering the signal line, and a shield layer covering the insulation layer. A first oxygen amount A 1 on an outer peripheral surface of the insulation layer is 1.2 times or greater than a second oxygen amount A 2 inside the insulation layer, or a contact angle on the outer peripheral surface the insulation layer is 130° or less, or an adhesion-wetting surface energy on the outer peripheral surface the insulation layer is 27 mJ/m 2 or greater, or a first amount of a hydroxy group on the outer peripheral surface of the insulation layer is greater than a second amount of a hydroxy group inside the insulation layer.
1. A signal transmission cable comprising:
a signal line;
an insulation layer covering the signal line; and
a shield layer covering the insulation layer,
wherein a first oxygen amount A 1 measured on an outer peripheral surface of the insulation layer is 1.2 times or greater than a second oxygen amount A 2 measured inside the insulation layer at a position where a distance from the outer peripheral surface of the insulation layer is 10 μm,
wherein a contact angle on the outer peripheral surface of the insulation layer is 106.1° or more and 111.0° or less,
wherein an adhesion-wetting surface energy on the outer peripheral surface of the insulation layer is 47 mJ/m 2 or greater and 53 mJ/m 2 or less,
wherein an arithmetic average roughness on the outer peripheral surface of the insulation layer is in a range from 1.0 to 1.3 μm, and
wherein no blister is present on a surface of the shield layer.
2. The signal transmission cable according to claim 1 ,
wherein a first amount of a hydroxy group on the outer peripheral surface of the insulation layer is greater than a second amount of a hydroxy group inside the insulation layer.
3. The signal transmission cable according to claim 1 ,
wherein the insulation layer comprises polyethylene or perfluoro ethylene propene copolymer.
4. The signal transmission cable according to claim 1 ,
wherein the shield layer comprises at least one selected from a group consisting of aluminum, aluminum alloy, copper, copper alloy, transition metal, and transition metal alloy.
5. The signal transmission cable according to claim 1 , wherein the shield layer comprises a plating layer.
6. The signal transmission cable according to claim 1 ,
wherein the shield layer comprises a plurality of stacked thin films, and
wherein at least a part of the plurality of thin films is selected from a group consisting of an aluminum thin film, an aluminum alloy thin film, a copper thin film, a copper alloy thin film, a transition metal thin film, and a transition metal alloy thin film.
7. The signal transmission cable according to claim 1 ,
wherein the shield layer comprises an element exhibiting magnetism.
8. The signal transmission cable according to claim 1 ,
wherein the shield layer comprises one or more selected from a group consisting of Fe, Co, Ni, and Gd.
9. The signal transmission cable according to claim 1 ,
wherein the shield layer comprises a rare earth element.
10. The signal transmission cable according to claim 1 ,
wherein the shield layer comprises one or more selected from a group consisting of Tb, Dy, Ho, Er, and Tm.
11. The signal transmission cable according to claim 1 ,
wherein the shield layer comprises a precious metal element and/or a rare metal.
12. The signal transmission cable according to claim 1 ,
wherein the shield layer comprises one or more selected from a group consisting of Au, Ag, Pt, Pd, Rh, Ir, Ru, and Os.
13. The signal transmission cable according to claim 1 ,
wherein the shield layer comprises a carbon nanotube.