WO1997041556B1 - Optical flying head with solid immersion lens having raised central surface facing media - Google Patents
Optical flying head with solid immersion lens having raised central surface facing mediaInfo
- Publication number
- WO1997041556B1 WO1997041556B1 PCT/US1997/006902 US9706902W WO9741556B1 WO 1997041556 B1 WO1997041556 B1 WO 1997041556B1 US 9706902 W US9706902 W US 9706902W WO 9741556 B1 WO9741556 B1 WO 9741556B1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- air bearing
- slider
- optical element
- optical
- bearing slider
- Prior art date
Links
- 230000003287 optical Effects 0.000 title claims abstract 20
- 238000007654 immersion Methods 0.000 title abstract 2
- 239000007787 solid Substances 0.000 title abstract 2
- 239000011248 coating agent Substances 0.000 claims 3
- 238000000576 coating method Methods 0.000 claims 3
- 239000000463 material Substances 0.000 claims 3
- 238000000926 separation method Methods 0.000 claims 3
- 238000004519 manufacturing process Methods 0.000 claims 2
- 238000005422 blasting Methods 0.000 claims 1
- 230000037250 Clearance Effects 0.000 abstract 1
- 230000035512 clearance Effects 0.000 abstract 1
Abstract
An air bearing assembly (10) for an optical drive carries a solid immersion lens (SIL) (16) having a bottom surface facing the disk contoured such that a central region (16c) where the optical path exits the bottom surface is closest to the recording media regardless of perturbations in the attitude of the air bearing and neighboring points on the surface (16b) surrounding the central region recede for clearance but function at least partly as an air bearing. In one embodiment the bottom surface (16c) of the SIL (16) has a radius of about 10 meters.
Claims
AMENDED CLAIMS
[received by the International Bureau on 2 February 1998 (02.02.98); original claims 11, 19, 22 and 24 amended; remaining claims unchanged (3 pages)] continuous curved surface.
11. The air bearing of claim 1 , wherein the contour of the bottom surface is defined by the formula:
R = for Separation « R
where R = radius of curvature of the surface, T = track pitch, E = evanescent wave extinction distance, which can either be a value approximately one wavelength λ of the radiation source or a value less than λ but significantly greater than the minimum separation distance between the central region of the optical element and the media, and
Separation = the distance between the optical element and the media.
12. The air bearing slider of claim 1 , wherein the contour of the bottom surface surrounding the central region is designed to avoid hitting the surface when the air bearing is perturbed.
13. The air bearing slider of claim 1 wherein the air bearing further comprises a slider and the optical element is an SIL mounted to the slider, the slider and bottom surface of the SIL together forming the air bearing.
14. The air bearing slider of claim 13, wherein the contour of the bottom surface is formed by the bottom surface of the SIL.
15. The air bearing slider of claim 13, further comprising an objective lens mounted to the slider in optical alignment with the SIL.
16. The air bearing slider of claim 1, wherein the contour on the bottom surface includes a central protrusion.
11
17. The air bearing slider of claim 16, wherein the protrusion is in the form of a rounded protuberance of greater curvature than the surrounding region.
18. The air bearing slider of claim 16, wherein the protrusion is in the form of a cylindrical projection.
19. The air bearing slider of claim 16, wherein the bottom surface surrounding the protrusion has a surface coating of nontransparent material.
20. The air bearing slider of claim 1 , wherein the bottom surface has a coating of nontransparent material with a clear aperture smaller than exit size of an optical read or write beam directed along the optical path thus serving as a spatial filter.
21. A method of making an optical air bearing slider comprising the step of mounting an optical element to an air bearing slider; CHARACTERIZED BY the steps of: coating the bottom surface of the optical element with a nontransparent material; and blasting a pinhole through the optical element with a laser beam applied through the optical element.
22. The method of claim 21, wherein the laser beam has a shorter wavelength than the optical reading beam.
23. The method of claim 22, wherein an aperture smaller than the optical read beam exit size is thereby created to form a spatial filter.
24. A method of making an optical air bearing comprising the step of mounting an optical element to an air bearing slider, and CHARACTERIZED BY the step of: lapping the bottom surface of the optical element to form a curved contour.
25. The method of claim 24, wherein the slider and bottom surface of the optical
element are lapped together.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP97922442A EP0895635A2 (en) | 1996-04-26 | 1997-04-25 | Optical flying head with solid immersion lens having raised central surface facing media |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/638,349 | 1996-04-26 | ||
| US08/638,349 US5729393A (en) | 1996-04-03 | 1996-04-26 | Optical flying head with solid immersion lens having raised central surface facing medium |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| WO1997041556A2 WO1997041556A2 (en) | 1997-11-06 |
| WO1997041556A3 WO1997041556A3 (en) | 1998-01-29 |
| WO1997041556B1 true WO1997041556B1 (en) | 1998-04-09 |
Family
ID=24559666
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/US1997/006902 WO1997041556A2 (en) | 1996-04-26 | 1997-04-25 | Optical flying head with solid immersion lens having raised central surface facing media |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US5729393A (en) |
| EP (1) | EP0895635A2 (en) |
| TW (1) | TW362212B (en) |
| WO (1) | WO1997041556A2 (en) |
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-
1996
- 1996-04-26 US US08/638,349 patent/US5729393A/en not_active Expired - Fee Related
-
1997
- 1997-04-25 EP EP97922442A patent/EP0895635A2/en not_active Withdrawn
- 1997-04-25 WO PCT/US1997/006902 patent/WO1997041556A2/en not_active Application Discontinuation
- 1997-09-06 TW TW086112923A patent/TW362212B/en active
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