Signal transmission cable

Patent metadata

Field	Value
Publication number	US-11955256-B2
Application number	US-202217859373-A
Country	US
Kind code	B2
Filing date	Jul 7, 2022
Priority date	Jul 16, 2021
Publication date	Apr 9, 2024
Grant date	Apr 9, 2024

Abstract

A signal transmission cable is provided with a conductor, an insulator covering around the conductor, a shield layer covering around the insulator, a sheath covering around the shield layer, and a plating base layer is provided between the insulator and the shield layer to cover around the insulator. The shield layer has a plating layer provided to cover the plating base layer to be in contact with an outer peripheral surface of the plating base layer. A surface roughness of an outer peripheral surface of the plating layer is less than a surface roughness of an inner peripheral surface of the plating layer.

First claim

The invention claimed is:

1. A signal transmission cable, comprising:
a conductor;
an insulator covering around the conductor;
a shield layer covering around the insulator;
a sheath covering around the shield layer; and
a plating base layer is provided between the insulator and the shield layer to cover around the insulator,
wherein the shield layer comprises a plating layer provided to cover the plating base layer to be in contact with an outer peripheral surface of the plating base layer,
wherein a surface roughness of an outer peripheral surface of the plating layer is less than a surface roughness of an inner peripheral surface of the plating layer,
the outer peripheral surface of the plating base layer is roughened to have a surface roughness of 2 μm or more, and
the arithmetic mean roughness Ra of the inner peripheral surface of the plating layer is 2 μm or more and the arithmetic mean roughness Ra of the outer peripheral surface of the plating layer is less than 2 μm, and
wherein a thickness of the plating layer is 2 μm or more and 5 μm or less.

2. The signal transmission cable according to claim 1 , wherein a thickness of the plating base layer is less than a thickness of the insulator.

3. The signal transmission cable according to claim 1 , wherein the plating layer is formed on the plating base layer, which is composed of a resin.

4. The signal transmission cable according to claim 1 , wherein a distance between the conductor and the plating layer is kept substantially constant.

5. The signal transmission cable according to claim 1 , wherein the plating base layer flexibly deforms in response to bending.

6. A signal transmission cable, comprising:
a conductor;
an insulator covering around the conductor,
a shield layer covering around the insulator;
a sheath covering around the shield layer, and
a plating base layer is provided between the insulator and the shield layer to cover around the insulator,
wherein the shield layer comprises a plating layer provided to cover the plating base layer to be in contact with an outer peripheral surface of the plating base layer,
wherein a surface roughness of an outer peripheral surface of the plating layer is less than a surface roughness of an inner peripheral surface of the plating layer,
the outer peripheral surface of the plating base layer is roughened to have a surface roughness of 2 μm or more, and
the arithmetic mean roughness Ra of the inner peripheral surface of the plating layer is 2 μm or more and the arithmetic mean roughness Ra of the outer peripheral surface of the plating layer is less than 2 μm, and
wherein the insulator comprises a fluoropolymer and the plating base layer comprises polyethylene or polypropylene.

Assignees

• Hitachi Metals Ltd
• Proterial Ltd

Inventors

• Sagawa Hideyuki
• Huang Detian
• Sugiyama Takahiro
• Nonen Hideki
• Arai Masashi
• Ishikawa Hiroshi
• Li Xinweilong

Classifications

• H01B11/1808 Primary

  Construction of the conductors · CPC title

• H01B3/30 Primary

  plastics; resins; waxes · CPC title

• H01B7/17

  Protection against damage caused by external factors, e.g. sheaths or armouring · CPC title

• H01B11/1834

  Construction of the insulation between the conductors · CPC title

• H01B11/18 Primary

  Coaxial cables; Analogous cables having more than one inner conductor within a common outer conductor · CPC title