US5162073A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Textured air bearing surface
Assignee: NGK Insulators Ltd
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Filing: 1991-09-06
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Granted: 1992-11-10
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Expires: 2011-09-06
Abstract
Abstract The present invention discloses texturing of the slider air bearing surfaces of the magnetic heads in disk drives to reduce stiction that retards take-off and displaces critical lubricant in a magnetic head system. One embodiment of the present invention utilizes nonuniform etching of chemically identical components of a ferrite slider material due solely to random crystal orientation relative to the exposed surface. Another embodiment of the present invention utilizes a photoresist of a type used in making printed circuit boards, to form a pattern. Subsequently, the surface may be etched to form the antistiction properties. A variety of controlled and reproducible patterns as well as a controlled depth of pattern may be utilized.
Inventors
- 👤 Michael I. Aronoff
- 👤 Michael McNeil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:24
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/58; G11B5/60; G11B5/6005; G11B33/00; G11B33/14
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
70 words
A method of manufacturing a sliding surface on an air bearing portion of a head core slider for a magnetic disk drive, comprising the steps of: polishing said sliding surface to the desired smoothness; and chemically removing 1 to 10 microinches of material from selective regions of said air bearing portion to form a series of recesses in said air bearing portion in accordance with a controlled and reproducible pattern.
Claim 2
Independent Claim
70 words
A method of manufacturing a sliding surface on an air bearing portion of a head core slider for a magnetic disk drive, comprising the steps of: polishing said sliding surface to the desired smoothness; and chemically removing 1 to 10 microinches of material from selective regions of said air bearing portion to form a series of recesses in said air bearing portion in accordance with a controlled and reproducible pattern.
Claim 3
Dependent Claim
51 words
The method of manufacturing a sliding surface on an air bearing portion of a head core slider for a magnetic disk drive as defined in claim 1, further comprising selecting said regions for removal of material so that said removing step results in a pattern of continuous boundaries of varying sizes.
Claim 4
Dependent Claim
56 words
The method of manufacturing a sliding surface on an air bearing portion of a head core slier for a magnetic disk drive as defined in claim 1, further comprising selecting said regions for removal of material so that said removing step results in a pattern of closed geometric forms of a single shape and varying sizes.
Claim 5
Dependent Claim
52 words
The method of manufacturing a sliding surface on an air bearing portion of a head core slider for a magnetic disk drive as defined in claim 1, further comprising selecting said regions for removal of material so that said removing step results in a pattern of closed geometric forms of different shapes.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-11-10 | 1996-05-11 | 1996-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-11-10 | 2000-05-11 | 2000-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-11-10 | 2004-05-11 | 2004-11-10 | $7700.00 | Window Closed / Lapsed |