US4833556A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low drag stabilizer device for stabilizing the interface between a transducer and a moving medium
Assignee: Eastman Kodak Co
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Filing: 1987-12-22
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Granted: 1989-05-23
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Expires: 2007-12-22
Abstract
Abstract A ceramic stabilizer is shown for minimizing the drag experienced in a magnetic interface between the stabilizer and a rapidly moving pliable magnetic disk. The stabilizer includes a stabilizing block with an opening through which a magnetic head protrudes for engagement with the disk. A flat, circumferential air bearing surface on the ceramic block surrounds the opening adjacent the disk for generating coupling forces that deform the disk out of its nominal plane and into intimate contact with a transducing gap on the head. The air bearing surface possesses an RMS surface roughness of at least 10 Angstroms because of its ceramic composition. The advancing disk interacts with the roughed air bearing surface of the stabilizer to generate a microscopic turbulence therebetween which functions as a "lubricant" to lower drag, and thereby to lower current draw on the motor rotating the disk. A preferred ceramic material is barium titanate.
Inventors
- 👤 Gerald J. Kosarko
- 👤 Rodney D. Wagner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:57
CPC Classifications
G; G11; G11B; G11B17/00; G11B17/32
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
205 words
A stabilizer device for stabilizing the movement of a flexible magnetic disk mounted for rotation by a drive motor that advances the disk in a predetermined rotary direction in relation to a transducer, said device comprising: a ceramic stabilizing block comprised of conductive barium titanate and having a cavity in which the transducer is supported in spaced relationship to an edge of said cavity; a circumferential flat air bearing surface integrally formed on said ceramic block around said cavity on the side of said stabilizing block facing the disk, said ceramic surface having a RMS surface roughness of at least 10 Angstroms; a curved edge on at least the side of said circumferential roughened surface that faces the advancing disk; and means for disposing said stabilizing block at an angle with respect to the nominal plane of the disk so that said curved edge penetrates the nominal plane of the advancing disk, causing the disk to twist over said curved edge and to deflect upon said air bearing surface, whereby the surface of the advancing disk interacts with said roughened, conductive air bearing surface to minimize drag between the surfaces due to mechanical and electrical sources, thereby reducing the current required by said drive motor.
Claim 2
Dependent Claim
205 words
A stabilizer device for stabilizing the movement of a flexible magnetic disk mounted for rotation by a drive motor that advances the disk in a predetermined rotary direction in relation to a transducer, said device comprising: a ceramic stabilizing block comprised of conductive barium titanate and having a cavity in which the transducer is supported in spaced relationship to an edge of said cavity; a circumferential flat air bearing surface integrally formed on said ceramic block around said cavity on the side of said stabilizing block facing the disk, said ceramic surface having a RMS surface roughness of at least 10 Angstroms; a curved edge on at least the side of said circumferential roughened surface that faces the advancing disk; and means for disposing said stabilizing block at an angle with respect to the nominal plane of the disk so that said curved edge penetrates the nominal plane of the advancing disk, causing the disk to twist over said curved edge and to deflect upon said air bearing surface, whereby the surface of the advancing disk interacts with said roughened, conductive air bearing surface to minimize drag between the surfaces due to mechanical and electrical sources, thereby reducing the current required by said drive motor.
Claim 3
Dependent Claim
24 words
A stabilizer device as claimed in claim 1 in which the resistivity of said ceramic stabilizing block is less than about 10 6 ohms-cm.
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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) | 1992-05-22 | 1992-11-21 | 1993-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-22 | 1996-11-21 | 1997-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-22 | 2000-11-21 | 2001-05-23 | $7700.00 | Window Closed / Lapsed |