TWO-CORE PARALLEL EXTRA-FINE COAXIAL CABLE

• US 20030006058A1
• Filed: 09/20/2001
• Published: 01/09/2003
• Est. Priority Date: 07/05/2001
• Status: Active Grant

• Current Assignee: Hitachi Metals (Thailand) Ltd.
• Original Assignee: Hitachi Cable Limited (Proterial Ltd.)
• Inventors: Yamamoto, Yuuki, Ueno, Satoshi, Tanaka, Hiroo
• Granted Patent: US 6,495,759 B1
• Time in Patent Office: Days
• US Class Current: 174/106R
• CPC Class Codes: H01B 11/20 Cables having a multiplicity of coaxial lines
• CPC Class Codes: H01B 7/0807 Twin conductor or cable
• CPC Class Codes: H01B 7/0861 comprising one or more screens

Abstract

It is an object of the present invention to provide a two-core parallel extra-fine coaxial cable having a high shield effect and sufficient flexibility for being wired in a narrow space. To achieve the object, the invention provides a two-core parallel extra-fine coaxial cable comprising, two parallel cores 4a and 4b having inner conductors 2a and 2b whose outer peripheries are coated with insulations 3a and 3b, a transversely wound shield 5 provided around outer peripheries of the two cores 4a and 4b, a composite tape 8 which comprises a plastic tape 6 formed on its one surface with a metal deposition layer 7 and which is wound around an outer periphery of the transversely wound shield 5 such that the metal deposition layer 7 comes on the side of the transversely wound shield 5, and a jacket 9 for coating an outer periphery of the composite tape 8.

Claims

1. A two-core parallel extra-fine coaxial cable comprising,

two parallel cores having inner conductors whose outer peripheries are coated with insulations,

a transversely wound shield provided around outer peripheries of the two cores,

a composite tape which comprises a plastic tape formed on its one surface with a metal deposition layer and which is wound around an outer periphery of the transversely wound shield such that the metal deposition layer comes on the side of the transversely wound shield, and

a jacket for coating an outer periphery of the composite tape.

2. A two-core parallel extra-fine coaxial cable according to claim 1, wherein an outer diameter of the inner conductor of the core is about 0.13 mm or less, an outer diameter of the core is 0.45 mm or less, and an outer diameter of the cable when coated with the jacket is 1.0 mm or less.

3. A two-core parallel extra-fine coaxial cable according to claim 1 or 2, wherein a transversely winding pitch of the transversely wound shield is set in accordance with the following equation:

10≦

(transversely winding pitch)/{(outer diameter of core) ×

2+(diameter of transversely wound strand)}≦

20.

4. A two-core parallel extra-fine coaxial cable according to any one of claims 1 to 3, wherein the transversely wound shield is formed by winding 30 to 60 strands comprising any of a soft copper wire, a tinned soft copper wire and a silver plated copper alloy wire around the outer peripheries of the two parallel cores.

5. A two-core parallel extra-fine coaxial cable according to any of claims 1 to 4, wherein a diameter of each of strands forming the transversely wound shield is about 0.03 mm.

6. A two-core parallel extra-fine coaxial cable according to any of claims 1 to 5, wherein the metal deposition layer formed on the composite tape is made of silver or copper, and a thickness of the metal deposition layer is 0.1 μ

m or more.

7. A two-core parallel extra-fine coaxial cable comprising,

two parallel cores having inner conductors whose outer peripheries are coated with insulations,

a transversely wound shield provided around outer peripheries of the two cores,

a composite tape which comprises a plastic tape formed on its opposite surfaces with metal deposition layers and which is wound around an outer periphery of the transversely wound shield such that the metal deposition layers come on the side of the transversely wound shield, and

a jacket for coating an outer periphery of the composite tape.

8. A two-core parallel extra-fine coaxial cable according to claim 7, wherein an outer diameter of the inner conductor of the core is about 0.13 mm or less, an outer diameter of the core is 0.45 mm or less, and an outer diameter of the cable when coated with the jacket is 1.0 mm or less.

9. A two-core parallel extra-fine coaxial cable according to claim 7 or 8, wherein a transversely winding pitch of the transversely wound shield is set in accordance with the following equation:

10≦

(transversely winding pitch)/{(outer diameter of core) ×

2+(diameter of transversely wound strand)}≦

20.

10. A two-core parallel extra-fine coaxial cable according to any one of claims 7 to 9, wherein the transversely wound shield is formed by winding 30 to 60 strands comprising any of a soft copper wire, a tinned soft copper wire and a silver plated copper alloy wire around the outer peripheries of the two parallel cores.

11. A two-core parallel extra-fine coaxial cable according to any of claims 7 to 10, wherein a diameter of each of strands forming the transversely wound shield is about 0.03 mm.

12. A two-core parallel extra-fine coaxial cable according to any of claims 7 to 11, wherein the metal deposition layer formed on the composite tape is made of silver or copper, and a thickness of the metal deposition layer is 0.1 μ

m or more.