Patent US3823416A successfully refreshed from Google Patents.
US3823416A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flying magnetic transducer assembly having three rails
Assignee: International Business Machines Corp
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Filing: 1973-03-01
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Granted: 1974-07-09
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Expires: 1993-03-01
Abstract
Abstract A magnetic head assembly is disclosed for transducing information upon a relatively moving magnetic recording surface while flying thereover and that starts and stops in contact with the recording surface. The assembly comprises a magnetic slider body including three downwardly depending longitudinal rails that are laterally spaced apart, the bottom surfaces of the two outside rails forming an air bearing surface, and a magnetic core longitudinally aligned with the center rail so as to define a transducing gap. The transducing gap is located at the roll axis of the assembly such that the air bearing developed during relative movement maintains the gap at a substantially constant distance from the recording surface even during rolling motion of the assembly.
Inventors
- 👤 M Warner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:50
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/1272; G11B5/48; G11B5/58; G11B5/60; G11B5/6005
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
96 words
A magnetic transducer assembly for transducing information upon a magnetic recording surface during relative movement between the transducer assembly and the recording surface, said assembly comprising: a magnetic slider body including three downwardly depending longitudinal rails having bottom surfaces that are laterally spaced apart, the bottom surfaces of at least the two outside rails forming an air bearing surface, and a magnetic core longitudinally aligned with the center rail and at the trailing edge of said assembly, said core including a transducing gap portion that is substantially coplanar with the bottom surface of the center rail.
Claim 2
Dependent Claim
96 words
A magnetic transducer assembly for transducing information upon a magnetic recording surface during relative movement between the transducer assembly and the recording surface, said assembly comprising: a magnetic slider body including three downwardly depending longitudinal rails having bottom surfaces that are laterally spaced apart, the bottom surfaces of at least the two outside rails forming an air bearing surface, and a magnetic core longitudinally aligned with the center rail and at the trailing edge of said assembly, said core including a transducing gap portion that is substantially coplanar with the bottom surface of the center rail.
Claim 3
Dependent Claim
14 words
The magnetic transducer assembly set forth in claim 1, wherein said rails are beveled.
Claim 4
Dependent Claim
43 words
The magnetic transducer assembly set forth in claim 1, wherein said core proximate to said transducing gap has the same width as said center rail and extends rearwardly of said slider body, whereby said core does not contribute to said air bearing surface.
Claim 5
Dependent Claim
23 words
The magnetic transducer assembly set forth in claim 1, wherein the trailing edge of said core is inclined away from said coplanar portion.
Claim 6
Dependent Claim
26 words
The magnetic transducer assembly set forth in claim 1, wherein the bottom surfaces of said outside rails and said center rail and said core are coplanar.
Claim 7
Dependent Claim
41 words
The magnetic transducer assembly set forth in claim 1, wherein said core is substantially uniform in width and tapers to form a more narrow transducing gap, the greater width in the back gap region contributing to an increase in transducer efficiency.
Claim 8
Dependent Claim
70 words
The magnetic transducer assembly set forth in claim 1, wherein said gap is located along the centerline of said center rail and at the roll axis and the pitch axis of said assembly, such that the air bearing developed during relative movement between said assembly and said recording surface maintains said gap at a substantially constant distance from said recording surface even during rolling and pitching motion of said assembly.
Claim 9
Dependent Claim
32 words
The magnetic transducer assembly set forth in claim 7, said slider body being symmetrical around the roll axis and wherein said outside rails are at the outer extremities of said slider body.
Claim 10
Dependent Claim
28 words
The magnetic transducer assembly set forth in claim 1, wherein said three rails have a taper-flat profile, said outside rails providing substantially the entire effective air bearing surface.
Claim 11
Dependent Claim
30 words
The magnetic transducer assembly set forth in claim 9, wherein said air bearing surfaces of said rails are rectangular and have a length to width ratio of at least five.
Claim 12
Dependent Claim
44 words
The magnetic transducer assembly set forth in claim 9, wherein the associated pressure profile developed longitudinally along said air bearing surface comprises a double peak, the first peak occurring rearwardly of the taper-flat boundary and the second peak occurring at substantially the trailing surface.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-08 | 1978-01-07 | 1978-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-08 | 1982-01-07 | 1982-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-08 | 1986-01-07 | 1986-07-09 | $7700.00 | Window Closed / Lapsed |