Cable including non-flammable micro-particles

• US 7,244,893 B2
• Filed: 06/07/2004
• Issued: 07/17/2007
• Est. Priority Date: 06/11/2003
• Status: Active Grant

• Current Assignee: Belden Technologies, LLC (Belden Inc.)
• Original Assignee: Belden Technologies, LLC (Belden Inc.)
• Inventors: Clark, William T.
• Primary Examiner(s): Nguyen; Chau N.
• Application Number:
  US10/862,767
• Publication Number:
  US 20050023028A1
• Time in Patent Office: 1,135 Days
• Field of Search: 174/102.SC, 174/110.R, 174/113.R, 174/113.C, 174/110.A, 174/112, 174/110.F
• US Class Current: 174/113.00R
• CPC Class Codes: H01B 11/04 with pairs or quads mutually positioned to reduce cross-talk
• CPC Class Codes: H01B 7/295 using material resistant to flame

Abstract

A data communication cable including a plurality of twisted pairs of insulated conductors, each twisted pair including two electrical conductors, each surrounded by an insulating layer and twisted together to form the twisted pair, and a jacket substantially enclosing the plurality of twisted pairs of insulating conductors, wherein the insulating layer includes a dielectric material including a plurality of micro-particles. In one example, the jacket material may also include a plurality of micro-particles. The micro-particles, in one example, are made of a non-burnable and/or non-smokeable material such as, for example, glass or ceramic.

Claims

1. A data communication cable comprising:

a plurality of twisted pairs of insulated conductors, each twisted pair comprising two electrical conductors, each surrounded by an insulating layer and twisted together to form the twisted pair; and

a jacket substantially enclosing the plurality of twisted pairs of insulated conductors;

wherein the insulating layer comprises a dielectric material comprising a first plurality of micro-particles embedded in the dielectric material; and

wherein the micro-particles consist of solid glass particles.

2. The data communication cable as claimed in claim 1, wherein the jacket comprises a dielectric material comprising a second plurality of micro-particles.

3. The data communication cable as claimed in claim 2, wherein the second plurality of micro-particles are substantially spherical in shape.

4. The data communication cable as claimed in claim 1, further comprising a separator disposed among the plurality of twisted pairs of insulated conductors.

5. The data communication cable as claimed in claim 4, wherein the separator comprises a material having a second plurality of micro-particles disposed therein.

6. The data communication cable as claimed in claim 1, wherein the number of the first plurality of micro-particles within the insulating layer is controlled so as to provide a desired effective dielectric constant of the insulating layer.

7. The data communication cable as claimed in claim 1, further comprising a light pipe disposed proximate a surface of the jacket.

8. The data communication cable as claimed in claim 7, wherein the light pipe comprises a material that is conformable to the surface of the jacket.

9. The data communication cable as claimed in claim 7, wherein the light pipe has a predetermined color that serves to identify a characteristic of the data communication cable.

10. The data communication cable as claimed in claim 1, wherein the insulating layer comprises a thermoplastic material.

11. The data communication cable as claimed in claim 1, wherein the insulating layer is constructed with an appropriate combination of micro-particles and dielectric material such that the insulation layer is suitable for use as a single-layer insulation.

12. The data communication cable as claimed in claim 1, wherein the micro-particles are substantially spherical in shape and have a diameter of between approximately 50 micrometers and 300 micrometers.

13. A data communication cable comprising:

a plurality of twisted pairs of insulated conductors, each twisted pair comprising two electrical conductors, each surrounded by an insulating layer and twisted together to form the twisted pair;

a jacket substantially enclosing the plurality of twisted pairs of insulated conductors; and

a separator disposed among the plurality of twisted pairs of insulated conductors so as to separate at least one twisted pair of insulated conductors from others of the plurality of twisted pairs of insulated conductors;

wherein the jacket includes a dielectric material comprising a first plurality of micro-particles, the first plurality of micro-particles being substantially spherical in shape and having a diameter of between approximately 50 micrometers and 300 micrometers; and

wherein the separator includes a dielectric material having solid glass micro-particles embedded therein.

14. The data communication cable as claimed in claim 13, wherein the micro-particles comprise a non-burnable material.

15. The data communication cable as claimed in claim 13, wherein the micro-particles comprise a non-smokeable material.

16. The data communication cable as claimed in claim 13, wherein the first plurality of micro-particles are glass.

17. The data communication cable as claimed in claim 13, wherein the first plurality of micro-particles are filled with a substance having at least one property that changes as a function of thermal conditions of the cable.

18. The data communication cable as claimed in claim 13, wherein the insulating layer comprises a second plurality of micro-particles arranged within the insulating layer.

19. The data communication cable as claimed in claim 13, wherein first plurality of micro-particles include at least one of diamond dust, a ceramic material, solid glass particles, and a porous material.

20. The data communication cable as claimed in claim 13, wherein the first plurality of micro-particles comprise fluoropolymer micro-particles.

21. The data communication cable as claimed in claim 13, wherein the solid glass micro-particles are substantially spherical in shape and have a diameter in a range of about 50 micrometers to about 300 micrometers.