Communication cable having single twisted pair of insulated wires

Patent metadata

Field	Value
Publication number	US-10553329-B2
Application number	US-201615565526-A
Country	US
Kind code	B2
Filing date	Dec 21, 2016
Priority date	Mar 31, 2016
Publication date	Feb 4, 2020
Grant date	Feb 4, 2020

Abstract

A communication cable that has a reduced diameter while ensuring a required magnitude of characteristic impedance. The communication cable contains a twisted pair that contains a pair of insulated wires, twisted with each other and a sheath covering the twisted pair. Each of the insulated wires, contains a conductor that has a tensile strength of 400 MPa or higher and an insulation coating that covers the conductor. The sheath is made of an insulating material having a dielectric tangent of 0.0001 or higher. The communication cable 1 has a characteristic impedance of 100±10Ω.

First claim

The invention claimed is:

1. A communication cable, comprising:
a single twisted pair consisting of one pair of insulated wires twisted with each other, each of the insulated wires comprising:
a conductor that has a tensile strength of 400 MPa or higher; and
an insulation coating that covers the conductor;

an insulated sheath that covers the single twisted pair; and
a gap between an inner surface of the insulated sheath and the insulated wires constituting the single twisted pair, the communication cable having a characteristic impedance of 100±10Ω;
wherein each of the insulated wires has an outer diameter of 0.95 mm or smaller;
the conductor of each of the insulated wires has a breaking elongation of 7% or higher;
each of the insulated wires contacts the inner surface of the insulated sheath and also contacts an outer surface of the other one of the insulated wires of the single twisted pair; and
a total area of the gap occupies 30% or less of an area of a region surrounded by an outer surface of the insulated sheath in a section of the communication cable crossing an axis of the cable.

2. The communication cable according to claim 1 , wherein the sheath is made of an insulating material having a dielectric tangent of 0.0001 or higher.

3. The communication cable according to claim 2 , wherein the dielectric tangent of the sheath is higher than a dielectric tangent of the insulation coating of each of the insulated wires.

4. The communication cable according to claim 1 , wherein the sheath has a higher dielectric tangent than the insulation coating of each of the insulated wires.

5. The communication cable according to claim 1 , wherein the total area of the gap occupies 8% or more of the area of the region surrounded by the outer surface of the sheath in the section of the communication cable crossing the axis of the cable.

6. The communication cable according to claim 1 , wherein the conductor of each of the insulated wires has a cross-sectional area smaller than 0.22 mm 2 .

7. The communication cable according to claim 1 , wherein the insulation coating of each of the insulated wires has a thickness of 0.30 mm or smaller.

8. The communication cable according to claim 1 , wherein the twisted pair has a twist pitch of 45 times of an outer diameter of each of the insulated wires or smaller.

9. The communication cable according to claim 1 , wherein the sheath has an adhesion strength of 4 N or higher to the insulated wires.

10. The communication cable according to claim 1 , wherein each of the insulated wires is not wrenched about a twist axis of the insulated wire.

11. The communication cable according to claim 1 , wherein each of the insulated wires is made of a first or second copper alloy,
the first copper alloy comprising:
0.05 mass % or more and 2.0 mass % or less of Fe;
0.02 mass % or more and 1.0 mass % or less of Ti;
0 mass % or more and 0.6 mass % or less of Mg; and
a balance being Cu and unavoidable impurities,

the second copper alloy comprising:
0.1 mass % or more and 0.8 mass % or less of Fe;
0.03 mass % or more and 0.3 mass % or less of P;
0.1 mass % or more and 0.4 mass % or less of Sn; and
a balance being Cu and unavoidable impurities.

12. The communication cable according to claim 1 , wherein the conductor of each of the insulated wires has a conductor resistance of 150 mΩ/m or higher and 210 mΩ/m or lower.

13. The communication cable according to claim 1 , wherein the insulation coating of each of the insulated wires has a dielectric tangent of 0.001 or lower.

14. The communication cable according to claim 1 , wherein each of the insulated wires has an eccentricity ratio of 65% or higher.

15. The communication cable according to claim 1 , wherein the communication cable has a breaking strength of 100 N or higher.

16. The communication cable according to claim 1 , wherein the sheath has a thickness of 0.20 mm or larger and 1.0 mm or smaller.

17. The communication cable according to claim 1 , wherein the communication cable has a transmission mode conversion of 46 dB or higher at a frequency of 50 MHz.

18. The communication cable according to claim 1 , wherein the twisted pair has a twist pitch of 26 times of an outer diameter of each of the insulated wires or larger.

19. The communication cable according to claim 1 , wherein the gap occupies 26% or more of an area of a region surrounded by an inner surface of the insulated sheath in a section of the communication cable crossing the axis of the cable.

20. The communication cable according to claim 1 , wherein each of the conductors has an outer diameter of 0.45 mm or smaller.

Assignees

• Autonetworks Technologies Ltd
• Sumitomo Wiring Systems
• Sumitomo Electric Industries

Inventors

• UEGAKI Ryoma
• Taguchi Kinji

Classifications

• H01B11/02 Primary

  Cables with twisted pairs or quads · CPC title

• H01B7/0216 Primary

  Two layers · CPC title

• H01B11/08 Primary

  Screens specially adapted for reducing cross-talk · CPC title

• H01B11/12

  Arrangements for exhibiting specific transmission characteristics · CPC title

• H01B7/0291 Primary

  comprising two or more layers of insulation having different electrical properties · CPC title