INSULATED CONDUCTIVE ELEMENT HAVING A SUBSTANTIALLY CONTINUOUS BARRIER LAYER FORMED VIA RELATIVE MOTION DURING DEPOSITION

• US 20110056725A1
• Filed: 09/09/2009
• Published: 03/10/2011
• Est. Priority Date: 09/09/2009
• Status: Active Grant

• Current Assignee: Cochlear Limited
• Original Assignee: Cochlear Limited
• Inventors: Capcelea, Edmond, Rapsey, Jane L., Schuller, Peter, Dadd, Fysh
• Granted Patent: US 8,460,746 B2
• Time in Patent Office: Days
• US Class Current: 174/110.R
• CPC Class Codes: B05D 1/60 Deposition of organic layers from vapour phase vapour phase deposition in general C23C14/00, C23C16/00
• CPC Class Codes: B05D 2256/00 Wires or fibres
• CPC Class Codes: B05D 3/12 by mechanical means

Abstract

Coating an elongate, uncoated conductive element with a substantially continuous barrier layer. An uncoated conductive element is around a frame comprising spaced supports. During deposition, the relative position of the conductive element to the frame is adjusted so that all sections of the conductive element are physically separated from the supports for a time that is sufficient to form a desired coating of barrier material on all sections of the conductive element.

Claims

1. A method of coating an elongate, uncoated conductive element with a substantially continuous barrier layer, comprising:

winding the uncoated conductive element around a frame comprising spaced supports such that sections of the conductive element are positioned in contact with the two or more supports;

depositing a barrier material on the conductive element to form the barrier layer;

adjusting the relative position of the conductive element to the frame during deposition such that the sections of the conductive element are physically separated from the supports for a time that is sufficient to form the barrier substantially continuous barrier layer on the conductive element; and

unwinding the coated conductive element from the frame.

2. The method of claim 1, wherein adjusting the relative position of the conductive element to the frame during deposition comprises:

vibrating the frame during deposition.

3. The method of claim 2, wherein the frame is connected to a frame drive system comprising a motor configured to rotate the frame and an offset cam, and wherein the method further comprises:

generating vibration of frame with the offset cam during rotation of the frame by the motor.

4. The method of claim 2, wherein the frame is connected to a spring, and wherein the method further comprises:

generating vibration of the frame with the spring during deposition.

5. The method of claim 1, wherein the spaced supports comprise a plurality of substantially parallel rods, and wherein winding the uncoated conductive element comprises:

helically winding the uncoated conductive element around the plurality of rods such that each turn of the wound conductive element contacts each of the rods.

6. The method of claim 5, wherein the plurality of rods are configured to be positioned substantially horizontal in a deposition chamber to collectively rotate about a substantially horizontal axis during deposition, and wherein winding the uncoated conductive element around the plurality of rods further comprises:

winding the conductive element under a tension that substantially prevents the movement of the conductive element during rotation of the plurality of rods.

7. The method of claim 5, wherein the plurality of rods are configured to be positioned substantially horizontal in a deposition chamber to collectively rotate about a substantially horizontal axis during deposition, and wherein winding the uncoated conductive element around the plurality of rods further comprises:

loosely winding the conductive element around the rods such that conductive element becomes spaced from each rod during rotation of the plurality of rods.

8. The method of claim 6, wherein opposing ends of each of the plurality of rods of disposed in guides, and wherein the method further comprising:

rotating the frame during deposition such that the opposing ends at least one of rotate and move linearly within the guides.

9. The method of claim 1, wherein the spaced supports comprise a plurality of support arms extending from substantially parallel rods, and wherein winding the uncoated conductive element around the frame comprises:

loosely winding the conductive element around the frame such that conductive element follows a helical path about the rods, and such that the conductive element is positioned only on the support arms.

10. The method of claim 1, wherein the frame comprises a tubular structure and wherein the spaced support members comprise one or more notches in the surface of the tubular structure, and wherein winding the conductive element around the frame comprises:

loosely winding the conductive element around the frame such that conductive element follows a helical path about the tubular member through the notches.

11. The method of claim 1, wherein the frame comprises a plurality of independently rotatable disks, and wherein the spaced supports comprise a plurality of support arms extending from disks, and wherein the method further comprises:

rotating the risks with respect to one another to adjust the position of the conductive element to the support arms.

12. The method of claim 1, wherein the barrier material is deposited on the conductive element within a deposition chamber, wherein adjusting the relative position of the conductive element to the frame during deposition comprises:

continually moving the conductive element through the deposition chamber during deposition.

13. The method of claim 12, and wherein continually moving the conductive element during deposition further comprises:

moving the conductive element such that a section of conductive element enters and exits the deposition chamber in a time period that is sufficient to form a desired thickness of barrier material on the section of conductive element.

14. The method of claim 1, wherein adjusting the relative position of the conductive element to the frame during deposition comprises:

periodically moving the conductive element during deposition.

15. The method of claim 1, wherein depositing a barrier layer on the conductive element comprises:

depositing at least one layer of parylene on the conductive element.

16. The method of claim 1, wherein the method further comprises:

winding the insulated conductive element onto a spool, wherein the spooled length of the insulated conductive element is approximately equal to the length of the uncoated conductive element wound around the frame.

17. A coated conductive element formed by the process of claim 1.

18. A method of coating an elongate, uncoated conductive element, comprising:

winding the uncoated conductive element around a frame comprising spaced supports such that sections of the conductive element are positioned in contact with the supports;

depositing a barrier material on the conductive element;

moving at least one of the conductive element and the frame relative to one another during deposition of the barrier material such that a substantially continuous barrier layer is formed on the surface of the conductive element; and

unwinding the coated conductive element from the frame.

19. The method of claim 18, wherein moving at least one of the conductive element and the frame relative to one another during deposition comprises:

vibrating the frame during deposition.

20. The method of claim 19, wherein the frame is connected to a frame drive system comprising a motor configured to rotate the frame and an offset cam, and wherein the method further comprises:

generating vibration of frame with the offset cam during rotation of the frame by the motor.

21. The method of claim 19, wherein the frame is connected to a spring, and wherein the method further comprises:

generating vibration of the frame with the spring during deposition.

22. The method of claim 18, wherein the spaced supports comprise a plurality of substantially parallel rods, and wherein winding the uncoated conductive element comprises:

helically winding the uncoated conductive element around the plurality of rods such that each turn of the wound conductive element contacts each of the rods.

23. The method of claim 22, wherein the plurality of rods are configured to be positioned substantially horizontal in a deposition chamber to collectively rotate about a substantially horizontal axis during deposition, and wherein winding the uncoated conductive element around the plurality of rods further comprises:

winding the conductive element under a tension that substantially prevents the movement of the conductive element during rotation of the plurality of rods.

24. The method of claim 22, wherein the plurality of rods are configured to be positioned substantially horizontal in a deposition chamber to collectively rotate about a substantially horizontal axis during deposition, and wherein winding the uncoated conductive element around the plurality of rods further comprises:

loosely winding the conductive element around the rods such that conductive element becomes spaced from each rod during rotation of the plurality of rods.

25. The method of claim 23, wherein ends of each of the plurality of rods of disposed in guides, and wherein the method further comprising:

rotating the frame during deposition such that the opposing ends at least one of rotate and move linearly within the guides.

26. The method of claim 18, wherein the spaced supports comprise a plurality of support arms extending from substantially parallel rods, and wherein winding the uncoated conductive element around the frame comprises:

loosely winding the conductive element around the frame such that conductive element follows a helical path about the rods, and such that the conductive element is positioned only on the support arms.

27. The method of claim 18, wherein the frame comprises a tubular structure and wherein the spaced support members comprise one or more notches in the surface of the tubular structure, and wherein winding the conductive element around the frame comprises:

loosely winding the conductive element around the frame such that conductive element follows a helical path about the tubular member through the notches.

28. The method of claim 18, wherein the frame comprises a plurality of independently rotatable disks, and wherein the spaced supports comprise a plurality of support arms extending from disks, and wherein the method further comprises:

rotating the risks with respect to one another to adjust the position of the conductive element to the support arms.

29. The method of claim 18, wherein the barrier material is deposited on the conductive element within a deposition chamber, wherein adjusting the relative position of the conductive element to the frame during deposition comprises:

continually moving the conductive element through the deposition chamber during deposition.

30. The method of claim 29, and wherein continually moving the conductive element during deposition further comprises:

moving the conductive element such that a section of conductive element enters and exits the deposition chamber in a time period that is sufficient to form a desired thickness of barrier material on the section of conductive element.

31. The method of claim 18, wherein adjusting the relative position of the conductive element to the frame during deposition comprises:

periodically moving the conductive element during deposition.

32. The method of claim 18, wherein depositing a barrier layer on the conductive element comprises:

depositing at least one layer of parylene on the conductive element.

33. The method of claim 18, wherein the method further comprises:

winding the insulated conductive element onto a spool, wherein the spooled length of the insulated conductive element is approximately equal to the length of the uncoated conductive element wound around the frame.

34. The method of claim 18, wherein depositing a barrier layer on the conductive element comprises:

depositing at least one layer of parylene on the conductive element.

35. The method of claim 18, wherein the method further comprises:

winding the insulated conductive element onto a spool, wherein the spooled length of the insulated conductive element is approximately equal to the length of the uncoated conductive element wound around the frame.

36. A coated conductive element formed by the process of claim 18.