Coaxial cable and coaxial multicore cable

• US 20030168240A1
• Filed: 05/23/2002
• Published: 09/11/2003
• Est. Priority Date: 03/05/2002
• Status: Active Grant

• Current Assignee: Hitachi Cable Limited (Proterial Ltd.)
• Original Assignee: Hitachi Cable Limited (Proterial Ltd.)
• Inventors: Ito, Hiroyuki, Shimizu, Fumio, Ono, Nobuki
• Granted Patent: US 6,696,647 B2
• Time in Patent Office: Days
• US Class Current: 174/102R
• CPC Class Codes: H01B 11/1808 Construction of the conductors
• CPC Class Codes: H01B 11/1817 Co-axial cables with at least one metal deposit conductor

Abstract

A plastic tape with a metal layer, comprising a tape body and a metal layer, formed of electroplating, provided on the surface of the tape body is adopted as a plastic tape, with a metal layer, provided on an insulation covering an inner conductor. By virtue of this construction, a coaxial cable and a coaxial multicore cable can be realized wherein, even when the outer diameter of the insulation is small, the tape can be easily and surely provided on the insulation and, in addition, the thickness of the metal layer can be satisfactorily ensured, whereby a deterioration in electric characteristics attributable to a plastic tape with a metal layer can be surely avoided.

Claims

1. A coaxial cable comprising:

an inner conductor;

an insulation covering the inner conductor;

a plastic tape, with a metal layer, provided on the insulation;

an outer conductor provided on the plastic tape with a metal layer; and

a jacket provided on the outer conductor, wherein the plastic tape with a metal layer comprises a tape body and, provided as the metal layer on the surface of the tape body in the following order, a first metal layer and a second metal layer formed of electroplating.

2. The coaxial cable according to claim 1, wherein the first metal layer is a metal layer formed by vapor deposition of the metal.

3. The coaxial cable according to claim 1 or 2, wherein the thickness of the metal layer in the plastic tape with a metal layer is more than 1 μ

m and not more than 4 μ

m.

4. The coaxial cable according to any one of claims 1 to 3, wherein the plastic tape with a metal layer is provided so that the surface of the metal layer is in contact with the outer conductor.

5. The coaxial cable according to any one of claims 1 to 3, wherein the plastic tape with a metal layer is constructed so that the metal layer is provided on both sides of the tape body.

6. The coaxial cable according to any one of claims 1 to 5, wherein the insulation has an outer diameter of not more than 1 mm.

7. The coaxial cable according to any one of claims 1 to 6, wherein the outer conductor is formed of a braided material.

8. A coaxial multicore cable comprising:

a plurality of coaxial cables of the type according to any one of claims 1 to 7 which have been twisted together; and

a sheath covering the circumference of the plurality of twisted coaxial cables.