Patent US4636894A successfully refreshed from Google Patents.
US4636894A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recording head slider assembly
Assignee: Seagate Technology LLC
•
Filing: 1984-03-12
•
Granted: 1987-01-13
•
Expires: 2004-03-12
Abstract
Abstract A slider for flying along a recording surface and carrying a recording head (19,20) for recording data, comprising an air bearing region (12,14) to create a positive pressure region tending to support the slider, and a negative pressure region (21) tending to hold the slider close to the recording surface, with buffer pads (27,28) and grooves (25,26) between the positive and negative pressure regions to create a neutral pressure zone separation.
Inventors
- 👤 Frank S. C. Mo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:43
CPC Classifications
G; G11; G11B; G11B21/00; G11B21/16; G11B21/20; G11B21/21; G11B5/00; G11B5/48; G11B5/58; G11B5/60; G11B5/6005
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
184 words
A device for supporting a transducer over a recording medium surface on an air bearing generated by an air flow caused by the motion of the medium surface past the transducer, said device comprising: a slider having a surface including an air bearing region extending generally parallel to said medium surface to create a positive pressure region therebetween tending to support said slider over said medium surface, said slider also including in said surface a recessed zone for creating a negative pressure region between the slider and medium surface tending to pull said slider towards said medium surface, said slider also having formed therein a buffer pad and groove combination extending between and separating said positive and negative pressure regions for containing the negative pressure and for creating an ambient pressure region within said groove, and said buffer pad is sufficiently narrow as to preclude a significant positive pressure region between said buffer pad and said recording medium surface, in contrast to said positive pressure region created by said air bearing region, so that said buffer pad produces little or no air bearing effect.
Claim 2
Independent Claim
184 words
A device for supporting a transducer over a recording medium surface on an air bearing generated by an air flow caused by the motion of the medium surface past the transducer, said device comprising: a slider having a surface including an air bearing region extending generally parallel to said medium surface to create a positive pressure region therebetween tending to support said slider over said medium surface, said slider also including in said surface a recessed zone for creating a negative pressure region between the slider and medium surface tending to pull said slider towards said medium surface, said slider also having formed therein a buffer pad and groove combination extending between and separating said positive and negative pressure regions for containing the negative pressure and for creating an ambient pressure region within said groove, and said buffer pad is sufficiently narrow as to preclude a significant positive pressure region between said buffer pad and said recording medium surface, in contrast to said positive pressure region created by said air bearing region, so that said buffer pad produces little or no air bearing effect.
Claim 3
Dependent Claim
27 words
A device as defined in claim 1 wherein said slider buffer pad and groove combination extends generally parallel to the direction of air flow past said slider.
Claim 4
Dependent Claim
34 words
A device as defined in claim 2 wherein said air bearing region includes a surface positioned upstream relative to said air flow from said parallel surface that extends non parallel to said medium surface.
Claim 5
Dependent Claim
21 words
A device as defined in claim 3 wherein said negative pressure region includes a concave section formed in said slider surface.
Claim 6
Dependent Claim
28 words
A device as defined in claim 2 wherein said parallel surface forming said air bearing region extends on at least two sides of said negative pressure generating region.
Claim 7
Dependent Claim
18 words
A device as defined in claim 5 wherein said surface includes a plurality of buffer pads and grooves.
References Cited (Backward Citations)
US3678482A
Cited
US3823416A
Cited
US3855625A
Cited
US4212044A
Cited
JPS5552544A
Cited
US4218715A
Cited
JPS57200967A
Cited
US4553184A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-01-12 | 1990-07-14 | 1991-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-12 | 1994-07-14 | 1995-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-12 | 1998-07-14 | 1999-01-13 | $7700.00 | Window Closed / Lapsed |