Shields containing microcuts for use in communications cables

• US 9,424,964 B1
• Filed: 05/07/2014
• Issued: 08/23/2016
• Est. Priority Date: 05/08/2013
• Status: Active Grant

• Current Assignee: Superior Essex International IP
• Original Assignee: Superior Essex International Lp (LS Corporation)
• Inventors: Kithuka, Jones M., Gebs, Bernhart A.
• Primary Examiner(s): Nguyen, Chau N
• Application Number:
  US14/271,800
• Time in Patent Office: 839 Days
• Field of Search: 174/113.R, 174/102.SP
• US Class Current: 1/1
• CPC Class Codes: H01B 11/06 with means for reducing effects of electromagnetic or electrostatic disturbances, e.g. screens
• CPC Class Codes: H01B 11/1008 Features relating to screening tape per se

Abstract

Shielding elements for use in communication cables are described. A shielding element may include a dielectric material, and electrically conductive material may be formed on the dielectric material. Additionally, a plurality of microcuts may be formed in the electrically conductive material, for example, with one or more lasers. The plurality of microcuts may be spaced apart from one another such that electrically conductive material between the plurality of microcuts will fuse together if an electrical current is applied to the shielding element.

Claims

1. A cable comprising:

at least one twisted pair of individually insulated conductors;

a shielding element configured to provide electromagnetic shielding for the at least one twisted pair, the shielding element comprising;

a dielectric material;

electrically conductive material formed on the dielectric material, the electrically conductive material defining a plurality of patches with each patch having a longitudinal length between approximately 0.5 meters and approximately 5.0 meters, wherein a respective separation region is positioned between adjacent patches and at least one separation region has a total width along the longitudinal length between approximately 5.0 mm and approximately 100 mm and comprises;

a plurality of microcuts formed in the electrically conductive material, each of the plurality of microcuts having a width equal to or less than approximately 0.25 mm with the electrically conductive material positioned between adjacent microcuts having a width of less than approximately 25 mm such that the electrically conductive material between the plurality of microcuts will fuse together if an electrical current is applied to the shielding element; and

a jacket formed around the at least one twisted pair and the shielding element.

2. The cable of claim 1, wherein each patch of electrically conductive material has a longitudinal length between approximately 1.0 meter and approximately 3.0 meters.

3. The cable of claim 1, wherein the shielding element comprises one of (i) a shield layer formed around the at least one twisted pair, or (ii) a separator formed between the at least twisted pair and another twisted pair.

4. The cable of claim 1, wherein the plurality of microcuts are formed through the electrically conductive material.

5. The cable of claim 1, wherein the plurality of microcuts are formed partially through the electrically conductive material.

6. The cable of claim 1, wherein the at least one separation region has a total width along the longitudinal length of less than approximately 51 mm.

7. The cable of claim 1, wherein the separation regions are spaced apart along a longitudinal length of the shielding element in accordance with a pattern.

8. The cable of claim 1, wherein at least one of the plurality of microcuts is formed across a widthwise dimension of the shielding element approximately transverse to a longitudinal direction of the cable.

9. The cable of claim 1, wherein at least one of the plurality of microcuts is formed at an angle with respect to an edge of the shielding element.

10. The cable of claim 1, wherein the plurality of microcuts are formed in one of (i) a parallel line pattern, (ii) a dashed parallel line pattern, (iii) a rectangular pattern, (iv) an inverse rectangular pattern, (v) a diamond pattern, (vi) an inverse diamond pattern, (vii) a checkerboard pattern, or (viii) a curved line pattern.

11. The cable of claim 1, wherein the plurality of microcuts comprise microcuts that form one of (i) an alphanumeric character, (ii) a logo, or (iii) a graphical design.

12. The cable of claim 1, wherein the plurality of microcuts are formed by one or more lasers.

13. The cable of claim 1, wherein the plurality of microcuts are formed in an inline process during assembly of the cable.

14. A cable comprising:

a jacket defining a cable core;

a plurality of individually insulated conductors positioned within the cable core; and

a shield layer formed around at least one of the plurality of conductors, the shield layer comprising;

a plurality of electrically conductive patches formed on a substrate, each patch having a length of at least approximately 0.30 meters, wherein at least two of the patches are separated by a series of microcuts positioned in close proximity to one another, the series of microcuts having a total width of less than approximately 51 mm and each of the microcuts having a width equal to or less than approximately 0.25 mm.

15. The cable of claim 14, wherein the electrically conductive material positioned between the microcuts will fuse together if an electrical current is applied to the shield layer.

16. The cable of claim 14, wherein a width of electrically conductive material between adjacent microcuts is less than approximately 25 mm.

17. The cable of claim 14, wherein each of the plurality of microcuts is formed either (i) through the electrically conductive material or (ii) partially through the electrically conductive material.

18. The cable of claim 14, wherein the series of microcuts is formed in one of (i) a parallel line pattern, (ii) a dashed parallel line pattern, (iii) a rectangular pattern, (iv) an inverse rectangular pattern, (v) a diamond pattern, (vi) an inverse diamond pattern, (vii) a checkerboard pattern, or (viii) a curved line pattern.