Patent US4644641A successfully refreshed from Google Patents.
US4644641A
Expired / Lapsed
US
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Fabrication of "Delta" magnetic head-sliders
Assignee: Unisys Corp
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Filing: 1985-12-30
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Granted: 1987-02-24
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Expires: 2005-12-30
Abstract
Abstract Described are Delta-shaped magnetic recording "sliders", some being provided with a "back-bar" and associate "purge channel", the air bearing surface area of the sliders increasing gradually from a minimum at its nose to a maximum at its trailing edge.
Inventors
- 👤 Michael A. Verdone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:59
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/58; G11B5/60; G11B5/6005; G11B5/127; G11B5/187; G11B5/1871; G11B5/31; G11B5/3103; G11B5/3106; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/49036; Y10T29/49041
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
142 words
A method of fabricating a "Delta slider" means for flying a magnetic head on a fluid bearing relative to magnetic recording media moving in a predetermined direction in the fluid, this slider means comprising: a slider body having means defining a wedge-shaped fluid bearing surface having leading and trailing edges for flying above the moving media, the fluid bearing surface defining means comprising: a generally cuneiform planar fluid support surface FSS, the method including: providing a rectangular bar of slider material, this bar including a pair of elongate planar parallel "top" and "bottom" faces defined between opposing parallel sides; forming a row of identical relatively adjacent triangular slider pieces, including forming air bearing surfaces and associated cavities and other elements in common, the sliders being disposed in alternating reversed juxtaposition along the row; and severing the sliders so formed from the bar.
Claim 2
Independent Claim
142 words
A method of fabricating a "Delta slider" means for flying a magnetic head on a fluid bearing relative to magnetic recording media moving in a predetermined direction in the fluid, this slider means comprising: a slider body having means defining a wedge-shaped fluid bearing surface having leading and trailing edges for flying above the moving media, the fluid bearing surface defining means comprising: a generally cuneiform planar fluid support surface FSS, the method including: providing a rectangular bar of slider material, this bar including a pair of elongate planar parallel "top" and "bottom" faces defined between opposing parallel sides; forming a row of identical relatively adjacent triangular slider pieces, including forming air bearing surfaces and associated cavities and other elements in common, the sliders being disposed in alternating reversed juxtaposition along the row; and severing the sliders so formed from the bar.
Claim 3
Dependent Claim
24 words
The combination as recited in claim 1, wherein identical arrays of thin film transducers are formed, in common, along each slider base before severing.
Claim 4
Dependent Claim
63 words
The combination as recited in claim 2, wherein the sliders are defined and their elements so formed in common so as to be juxtaposed in alternating face-up/bottom-up relation, wherein an adjacent slider is up-ended and also face reversed, whereby every even number slider ABS faces up on one bar face while every odd number slider ABS faces up on the opposite bar face.
Claim 5
Dependent Claim
26 words
The combination as recited in claim 3, wherein a row of self-loading Delta sliders are so formed in common, with each ABS including a negative-pressure cavity.
Claim 6
Dependent Claim
22 words
The combination as recited in claim 4, wherein the ABS cavities and convergent sides of each slider are defined by laser means.
Claim 7
Independent Claim
133 words
A method of fabricating a number of idential magnetic recording Delta sliders in common, including the steps of: providing an elongate bar of slider material having a pair of parallel elongate edges and a pair of parallel elongate opposed top and bottom faces lying between these edges; defining at least one row of said sliders on at least one bar-face with adjacent sliders being defined in up-ended relation so that a first slider presents its trailing edge along a first bar edge, and the adjacent slider presents its trailing edge along the opposite bar edge, etc; depositing identical sets of thin film transducers along each bar edge, one set along the trailing edge of each slider; forming the rest of the slider elements in common on the bar; and severing the so-formed sliders.
Claim 8
Independent Claim
133 words
A method of fabricating a number of idential magnetic recording Delta sliders in common, including the steps of: providing an elongate bar of slider material having a pair of parallel elongate edges and a pair of parallel elongate opposed top and bottom faces lying between these edges; defining at least one row of said sliders on at least one bar-face with adjacent sliders being defined in up-ended relation so that a first slider presents its trailing edge along a first bar edge, and the adjacent slider presents its trailing edge along the opposite bar edge, etc; depositing identical sets of thin film transducers along each bar edge, one set along the trailing edge of each slider; forming the rest of the slider elements in common on the bar; and severing the so-formed sliders.
Claim 9
Dependent Claim
24 words
The combination as recited in claim 6, where each slider row is arranged to present adjacent slider air bearing surfaces (ABS) on opposite bar-faces.
Claim 10
Dependent Claim
21 words
The combination as recited in claim 7, where the sliders are so defined and separated in common by laser cutting means.
Claim 11
Dependent Claim
23 words
The combination as recited in claim 8, wherein a like negative-pressure cavity is formed on each slider ABS, to thus produce self-loading sliders.
Claim 12
Dependent Claim
18 words
The combination as recited in claim 9, wherein the thin film transducers are deposited along both slider faces.
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) | 1990-02-23 | 1990-08-25 | 1991-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-23 | 1994-08-25 | 1995-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-23 | 1998-08-25 | 1999-02-24 | $7700.00 | Window Closed / Lapsed |