Coaxial cables, multicore cables, and electronic apparatuses using such cables

• US 7,034,228 B2
• Filed: 10/15/2004
• Issued: 04/25/2006
• Est. Priority Date: 04/06/1998
• Status: Expired due to Fees

• Current Assignee: Sumitomo Electric Industries Limited (Sumitomo Corporation)
• Original Assignee: Sumitomo Electric Industries Limited (Sumitomo Corporation)
• Inventors: Yokoi, Kiyonori, Yamamoto, Akira, Mori, Akinori, Endo, Seiji
• Primary Examiner(s): Nguyen, Chau N.
• Application Number:
  US10/964,693
• Publication Number:
  US 20050045364A1
• Time in Patent Office: 557 Days
• Field of Search: 174/36, 174/28, 174/102.R, 174/117.FF, 174/108, 174/109, 174/106.R
• US Class Current: 174/102.00R
• CPC Class Codes: H01B 11/183 Co-axial cables with at least one helicoidally wound tape-conductor

Abstract

A coaxial element wire includes a center conductor, an insulation layer, and an outer conductor. The insulation layer is provided around the center conductor, and it has a thickness of 0.15 mm or less. The outer conductor is a ribbon-shaped conductor obtained by pressing a copper or copper alloy round wire into a flat form, without annealing after pressing. This ribbon-shaped conductor is spirally wrapped around the insulation layer to thereby form the coaxial element wire. The coaxial element wire may be covered with a protective jacket, and plural coaxial wire elements may be joined into a common jacket to form a multicore cable.

Claims

1. A coaxial element wire, comprising:

a center conductor;

a non-electrically conductive insulation layer, provided around the center conductor, and in contact therewith having a thickness of 0.03 mm or more and 0.15 mm or less at a portion of the insulation layer where the thickness is smallest; and

an outer conductor, consisting of at least one ribbon-shaped conductor of a virtually rectangular cross-section with its four corners smoothed, said at least one ribbon-shaped conductor made by pressing a copper or copper alloy round wire into a flat form without annealing after pressing,

said at least one ribbon-shaped conductor being helically wrapped around said insulation layer with one long side thereof facing said insulation layer, and

a wrapping angle of said at least one ribbon-shaped conductor with respect to an axis of said coaxial element wire is more than 45 degrees.

2. A multicore cable, comprising a plurality of said coaxial element wires according to claim 1 provided in a common outer jacket.

3. The multicore cable according to claim 2, wherein outer conductors of the coaxial element wires are in contact.

4. The multicore cable according to claim 2, wherein the plurality of coaxial element wires are twisted together and provided with said common outer jacket.

5. An electronic apparatus including at least one multicore cable according to claim 2, disposed at a position where said multicore cable is subjected to mechanical rotation or bending.

6. The coaxial element wire according to claim 1, wherein the outer, ribbon-shaped conductor is spirally wrapped such that adjacent wrappings of the outer conductor butt against one another.

7. The coaxial element wire according to claim 1, wherein said at least one ribbon-shaped conductor comprises a first ribbon-shaped conductor and a second ribbon-shaped conductor and wherein said first ribbon-shaped conductor is spirally wrapped in a first direction, and said second ribbon-shaped conductor is spirally wrapped in the first direction.

8. The coaxial element wire according to claim 7, wherein the second ribbon-shaped conductor overlaps the first ribbon-shaped conductor.

9. The coaxial element wire according to claim 1, wherein said at least one ribbon-shaped conductor comprises a first ribbon-shaped conductor and a second ribbon-shaped conductor and wherein said first ribbon-shaped conductor is spirally wrapped in a first direction and said second ribbon-shaped conductor is spirally wrapped in a second direction opposite the first direction.

10. The coaxial element wire according to claim 1, wherein said insulation layer is made of PFA.

11. A method of making a coaxial element wire, comprising:

providing a center conductor;

providing a non-electrically conductive insulation layer around the center conductor and in contact therewith, wherein the insulation layer has a thickness of 0.03 mm or more and 0.15 mm or less at a portion of the insulation layer where the thickness is smallest;

providing an outer conductor consisting of at least one ribbon-shaped conductor formed by pressing a copper or copper alloy round wire into a flat form, without annealing after pressing; and

spirally wrapping said at least one ribbon-shaped conductor around said insulation layer with one long side thereof facing said insulation layer to thereby provide a coaxial element wire, wherein a wrapping angle of said at least one ribbon-shaped conductor with respect to an axis of said coaxial element wire is more than 45 degrees.

12. The method of making a coaxial element wire according to claim 11, wherein said at least one ribbon-shaped conductor comprises a first ribbon-shaped conductor and a second ribbon-shaped conductor.

13. The method of making a coaxial element wire according to claim 12, wherein said first and second ribbon-shaped conductors are wrapped around said insulation layer in the same direction.

14. The method of making a coaxial element wire according to claim 12, wherein said first and second ribbon-shaped conductors are wrapped around said insulation layer in opposite directions.

15. A method of making a coaxial element wire, according to claim 11, wherein

said insulation layer said at least one ribbon-shaped conductor has a virtually rectangular cross section with its four corners smoothed and a thickness of 0.01 mm or more and 0.03 mm or less.

16. A coaxial element wire, comprising:

a center conductor;

a non-electrically conductive insulation layer, provided around said center conductor, and in contact therewith having a thickness of 0.03 mm or more and 0.15 mm or less at a portion of said insulation layer where the thickness is smallest;

an outer conductor consisting of at least one ribbon-shaped conductor of a virtually rectangular cross-section with its four corners smoothed; and

said at least one ribbon-shaped conductor having a thickness of 0.01 mm or more and 0.03 mm or less, being made by pressing a copper or copper alloy round wire into a flat form without annealing after pressing, being helically wrapped around said insulation layer with one long side thereof facing said insulation layer, and having a wrapping angle with respect to said coaxial element wire at more than 45 degrees.

17. A coaxial element wire, comprising:

a center conductor;

a non-electrically conductive insulation layer, provided around said center conductor, and in contact therewith having a thickness of 0.03 mm or more and 0.15 mm or less at a portion of said insulation layer where the thickness is smallest; and

an outer conductor consisting of at least one ribbon-shaped conductor of a virtually rectangular cross-section with its four corners smoothed, said at least one ribbon-shaped conductor being helically wrapped around said insulation layer with one long side thereof facing said insulation layer, and having a wrapping angle with respect to said coaxial element wire at more than 45 degrees.

18. A method of making a multicore cable, comprising:

providing a center conductor;

providing a non-electrically conductive insulation layer around said center conductor and in contact therewith, wherein said insulation layer has a thickness of 0.03 mm or more and 0.15 mm or less at a portion of said insulation layer where the thickness is smallest;

providing an outer conductor consisting of at least one ribbon-shaped conductor formed by pressing a copper or copper alloy round wire into a flat form, without annealing after pressing;

spirally wrapping said at least one ribbon-shaped conductor around said insulation layer with one long side thereof facing said insulation layer to thereby provide a coaxial element wire, wherein a wrapping angle of said at least one ribbon-shaped conductor with respect to an axis of said coaxial element wire is more than 45 degrees; and

assembling a plurality of said coaxial element wires in a common jacket.