Claims
- 1. A head for use in accessing data from an electrically conductive media surface, the head comprising:
a slider body having an air bearing surface defining a bearing surface plane configured to face the media surface; a fly height control electrode positioned on the slider body, wherein the fly height control electrode and the media surface are adapted to form opposing plates of a capacitor with a dielectric layer of air supporting the head, the fly height control electrode being electrically isolated from the slider body; and a head electrical connection disposed on the slider body and electrically connected to the fly height control electrode, the head electrical connection adapted to provide a fly height control voltage to the fly height control electrode.
- 2. The head of claim 1 and further comprising an insulating layer positioned between the fly height control electrode and the slider body.
- 3. The head of claim 2 and further comprising a ground electrical connection coupled to the head.
- 4. The head of claim 2 and further comprising a buffer layer adapted to be positioned between the fly height control electrode and the media surface.
- 5. The head of claim 1 and further comprising a second fly height control electrode connected to the head electrical connection and electrically isolated from the slider body
- 6. The head of claim 5 wherein the head electrical connection is adapted to provide a positive voltage to the first-mentioned fly height control electrode and adapted to provide a negative voltage to the second fly height control electrode.
- 7. The head of claim 1 wherein the slider body comprises a raised center pad, wherein the fly height control electrode is positioned on the center pad.
- 8. The head of claim 7 and further comprising a second fly height control electrode positioned on the center pad.
- 9. The head of claim 1 wherein the slider body comprises a side rail, wherein the fly height control electrode is positioned on the side rail.
- 10. The head of claim 1 wherein the fly height control electrode is displaced from the bearing surface plane in the range of about 0.005 microns to 0.05 microns.
- 11. The head of claim 1, wherein the fly height control electrode is of substantially the same material as the slider body.
- 12. A method of fabricating a head for use in controlling fly height with respect to an electrically conductive media surface, the method comprising:
providing a slider body having a leading edge, a trailing edge and an air bearing surface defining a bearing surface plane; electrically isolating a fly height control electrode from the slider body; and providing an electrical connection to the fly height control electrode, the electrical connection adapted to provide a fly height control voltage to the fly height control electrode.
- 13. The method of claim 11 and further comprising providing an insulating layer positioned between the fly height control electrode and the slider body.
- 14. The method of claim 12 and further comprising providing a ground electrical connection coupled to the slider body.
- 15. The method of claim 12 and further comprising providing a buffer layer adapted to be positioned between the fly height control electrode and the media surface.
- 16. The method of claim 11 and further comprising electrically isolating a second fly height control electrode from the slider body.
- 17. The method of claim 1 and further comprising positioning a raised center pad on the slider body, wherein the fly height control electrode is positioned on the center pad.
- 18. The method of claim 17 and further comprising positioning a second fly height control electrode on the center pad.
- 19. The method of claim 11 and further comprising positioning the fly height control electrode displaced from the bearing surface plane in the range of about 0.005 microns to 0.05 microns.
- 20. The method of claim 11 wherein electrically isolating comprises:
etching a cavity in the trailing edge; providing an insulating layer in the cavity; and forming an air bearing surface on the slider body.
- 21. The method of claim 20 wherein electrically isolating further comprises;
filling the cavity with conductive material; and forming the air bearing surface to expose the conductive material.
- 22. The method of claim 11 wherein electrically isolating comprises:
providing a layer of conductive material to the trailing edge; and positioning a transducer layer between the layer of conductive material and the slider body.
- 23. The method of claim 22 wherein providing a layer of conductive material comprises providing conductive material to a center portion of the trailing edge.
- 24. A head fabricated according to the method of claim 12.
- 25. An apparatus comprising:
an electrically conductive media surface; a head having a substrate with an air bearing surface shaped to provide a fly height spacing between the head and the media surface and a fly height control electrode electrically isolated from the substrate; and means for electrically charging the fly height control electrode with respect to the media surface to adjust the fly height spacing.
- 26. The apparatus of claim 25 and further comprising a second fly height control electrode on the head and means for electrically charging the second fly height control electrode with respect to the media surface to adjust the fly height spacing.
- 27. The apparatus of claim 26 and further comprising:
means for applying a positive voltage to the first-mentioned fly height control electrode and a negative voltage to the second fly height control electrode.
- 28. The apparatus of claim 25 wherein the means for electrically charging include providing an electrical connection to the fly height control electrode.
- 29. The apparatus of claim 25 wherein the means for electrically charging include providing an electrical connection to the media surface.
- 30. The apparatus of claim 25 and further comprising a buffer layer positioned between the fly height control electrode and the media surface.
CROSS-REFERENCE TO RELATED APPLICATION
[0001] This application claims benefit of U.S. Provisional Application 60/314,521 titled “Contact Detection and Calibration for Electrostatic Fly Height Control in Disc Drive,” filed Aug. 22, 2001, U.S. Provisional Application 60/332,236 titled “Dedicated Electrodes for Electrostatic Fly Height Control,” filed Nov. 16, 2001 and U.S. Provisional Application 60/371,224 titled “Dedicated Electrode Concepts for Electrostatic Fly Height Control,” filed Apr. 9, 2002.
Provisional Applications (3)
|
Number |
Date |
Country |
|
60314521 |
Aug 2001 |
US |
|
60332236 |
Nov 2001 |
US |
|
60371224 |
Apr 2002 |
US |