Multiple core coaxial cable

• US 4,970,352 A
• Filed: 03/14/1989
• Issued: 11/13/1990
• Est. Priority Date: 03/14/1988
• Status: Expired due to Term

• Current Assignee: Sumitomo Electric Industries Limited (Sumitomo Corporation)
• Original Assignee: Sumitomo Electric Industries Limited (Sumitomo Corporation)
• Inventors: Satoh, Kazuhiro
• Primary Examiner(s): NIMMO, MORRIS
• Application Number:
  US07/333,415
• Time in Patent Office: 609 Days
• Field of Search: 174/106 R, 174/103, 174/108, 174/102 G
• US Class Current: 174/106.00R
• CPC Class Codes: G01R 31/58 Testing of lines, cables or conductors testing of electric windings G01R31/72
• 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
• CPC Class Codes: H01B 11/20 Cables having a multiplicity of coaxial lines

Abstract

A multicore coaxial cable includes a conductor layer, an insulator layer surrounding the conductor layer, plastic tape surrounding the insulator and a metal shield surrounding the plastic tape. The exterior surface of the plastic tape is coated with a metal layer to contact the metal shield to reduce the electrostatic noises in the cable.

Claims

1. A coaxial cable comprising:

an electrical conductor;

an insulator enclosing the conductor;

a metal-coated plastic layer enclosing the insulator, the layer having an interior surface made of a non-metallic layer integrated with the insulator, and having an exterior surface made of a metallic layer not less than 0.2 μ

m thick;

a metal shield enclosing the metal-coated plastic layer and contacting the exterior surface of the metal-coated plastic layer.

2. A coaxial cable comprising:

an electrical conductor;

an insulator enclosing said conductor;

a plastic tape having an exterior surface coated with a metal layer, said plastic tape being wound around and integrated with said insulator; and

a metal shield enclosing said plastic tape so that said metal layer of said plastic tape comes into contact with said metal shield, said metal shield comprising a spiral covering about said plastic tape.

3. A coaxial cable according to claim 2, wherein:

the metal layer is an evaporation coated metal layer not less than 0.2 μ

m thick.

4. A coaxial cable according to claim 2, wherein:

the metal layer is a sputtering coated metal layer not less than 0.2 μ

m thick.

5. A multi-core cable comprising:

a plurality of coaxial shielded cables each including an electrical conductor; and

a plurality of insulators enclosing said conductors in a one-to-one correspondence, a plurality of plastic tapes having exterior surfaces coated with metal layers not less than 0.2 μ

m thick and being wound around and integrated with said insulators in a one-to-one correspondence; and

a plurality of metal shields enclosing said plastic tapes on a one-to-one correspondence so that said metal layers of said plastic tapes come into contact with said corresponding metal shields.

6. A multicore cable according to claim 5, wherein:

the metal layer is an evaporation coated metal layer not less than 0.2 μ

m thick.

7. A multicore cable according to claim 5, wherein:

the metal layer is a sputtering coated metal layer not less than -.2 μ

m thick.