Patent US4486798A successfully refreshed from Google Patents.
US4486798A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-cleaning magnetic head air bearing slider and method
Assignee: International Business Machines Corp
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Filing: 1982-09-30
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Granted: 1984-12-04
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Expires: 2002-09-30
Abstract
Abstract In a magnetic disk file, the longitudinal rails of an air-bearing head slider are skewed at a predetermined angle relative to a tangential velocity vector line that passes through a transducer tangent to the particular data track over which said transducer is then disposed for causing airborne debris particles that are drawn in under the rails to be directed in a path that substantially avoids said transducer to reduce wear thereof. This angle is sufficient to cause said debris particles to be dispersed into a viscous fluid stream that flows outboard of said tangential velocity vector line and said transducer.
Inventors
- 👤 Norbert A. Feliss
- 👤 Tim W. Lile
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:22
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/58; G11B5/60; G11B5/6005
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
132 words
A magnetic disk file comprising: rotary magnetic disk means having circular data tracks registered thereon; a magnetic head slider including a pair of longitudinal rails and a transducer at the trailing end of one of the rails for interacting with said magnetic disk means in transducing relation; said rails being formed on the surface of said slider that faces said disk means for providing an air bearing surface; and said slider and rails being positioned at a predetermined skew angle relative to a tangential velocity vector line that passes through the transducer tangent to the particular data track over which said transducer is then disposed for causing airborne debris particles that are drawn in under the rails to be directed in a path that substantially avoids said transducer to reduce wear thereof.
Claim 2
Dependent Claim
132 words
A magnetic disk file comprising: rotary magnetic disk means having circular data tracks registered thereon; a magnetic head slider including a pair of longitudinal rails and a transducer at the trailing end of one of the rails for interacting with said magnetic disk means in transducing relation; said rails being formed on the surface of said slider that faces said disk means for providing an air bearing surface; and said slider and rails being positioned at a predetermined skew angle relative to a tangential velocity vector line that passes through the transducer tangent to the particular data track over which said transducer is then disposed for causing airborne debris particles that are drawn in under the rails to be directed in a path that substantially avoids said transducer to reduce wear thereof.
Claim 3
Dependent Claim
39 words
A magnetic disk file as in claim 1, wherein said skew angle is sufficient to cause said debris particles to be dispersed into a viscous fluid stream that flows outboard of said tangential velocity vector line and said transducer.
Claim 4
Dependent Claim
46 words
A magnetic disk file as in claim 1, wherein said skew angle is θ=tan -1 (x/L), where x is within a range from W to somewhat more than W/2, and W is the width of said one rail, and L is the length of said slider.
Claim 5
Dependent Claim
21 words
A magnetic disk file as in claim 1, wherein said skew angle is in the range of 4 to 10 degrees.
Claim 6
Dependent Claim
28 words
A magnetic disk file as in claim 1, wherein said transducer is substantially centered at the trailing edge of said slider, and x is substantially equal to W.
Claim 7
Independent Claim
99 words
A method of minimizing wear caused to a magnetic transducer by debris particles that pass between a slider carrying the magnetic transducer and a rotating magnetic disk with which the transducer interacts in transducing relation, comprising the step of disposing the slider at a skew angle to the tangential velocity vector line that passes through the transducer tangent to the particular data track over which said transducer is then disposed, said angle being sufficient to cause said debris particles to be dispersed into a viscous fluid stream that flows outboard of said tangential velocity vector line and said transducer.
Claim 8
Independent Claim
99 words
A method of minimizing wear caused to a magnetic transducer by debris particles that pass between a slider carrying the magnetic transducer and a rotating magnetic disk with which the transducer interacts in transducing relation, comprising the step of disposing the slider at a skew angle to the tangential velocity vector line that passes through the transducer tangent to the particular data track over which said transducer is then disposed, said angle being sufficient to cause said debris particles to be dispersed into a viscous fluid stream that flows outboard of said tangential velocity vector line and said transducer.
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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) | 1987-12-04 | 1988-06-04 | 1988-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-04 | 1992-06-04 | 1992-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-04 | 1996-06-04 | 1996-12-04 | $7700.00 | Window Closed / Lapsed |