Patent US4280155A successfully refreshed from Google Patents.
US4280155A
Expired / Lapsed
US
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Method of improving air flow in compact disc drive
Assignee: Unisys Corp
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Filing: 1979-06-04
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Granted: 1981-07-21
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Expires: 1999-06-04
Abstract
Abstract A method is described for improving the air flow over the surfaces of magnetic recording discs in a disc drive having a plurality of rotatingly driven such discs each having adiameter of less than nine inches and being coaxial and spaced from one another, and such disc drive having a plurality of selectively positionable magnetic transducer heads overlying portions of the discs, the method including spacing adjacent such discs a predetermined minimum distance from one another.
Inventors
- 👤 John C. Scott
- 👤 Robert I. McClure
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:32
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/4806; G11B23/00; G11B23/50; G11B23/505
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
154 words
In a compact magnetic recording disc drive having a plurality of rotatingly driven rigid magnetic recording discs each having a diameter of less than nine inches and being coaxial with and space from one another and a plurality of selectively positionable magnetic transducer heads overlying portions of said discs and being suported a predetermined distance from the rotating discs by aerodynamic lift caused by the interaction of the moving air films carried by the flat surface of the rotating discs and the transducer heads said disc drive being supported by a base plate and enclosed by a cover, said cover having a length and a width, one of the dimensions being less than nine inches, the method of improving the air flow over the disc surfaces to stabilize the support of the transducer heads while reducing thermal gradients, comprising spacing adjacent said recording discs from one another a distance of at least 0.9 inch.
Claim 2
Dependent Claim
154 words
In a compact magnetic recording disc drive having a plurality of rotatingly driven rigid magnetic recording discs each having a diameter of less than nine inches and being coaxial with and space from one another and a plurality of selectively positionable magnetic transducer heads overlying portions of said discs and being suported a predetermined distance from the rotating discs by aerodynamic lift caused by the interaction of the moving air films carried by the flat surface of the rotating discs and the transducer heads said disc drive being supported by a base plate and enclosed by a cover, said cover having a length and a width, one of the dimensions being less than nine inches, the method of improving the air flow over the disc surfaces to stabilize the support of the transducer heads while reducing thermal gradients, comprising spacing adjacent said recording discs from one another a distance of at least 0.9 inch.
Claim 3
Dependent Claim
31 words
The method of improving air flow according to claim 1 further comprising spacing the recording disc adjacent said base plate a distance of at least 0.9 inch from said base plate.
Claim 4
Dependent Claim
33 words
The method of improving air flow according to claim 1 further comprising spacing the recording disc whose broad surface is adjacent said cover a distance of at least 0.9 inch from said cover.
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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) | 1984-07-20 | 1985-01-19 | 1985-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-07-20 | 1989-01-19 | 1989-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-07-20 | 1993-01-19 | 1993-07-21 | $7700.00 | Window Closed / Lapsed |