US3737880A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible disc with air intake in turntable
Assignee: Meritor Inc
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Filing: 1971-09-10
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Granted: 1973-06-05
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Expires: 1991-09-10
Abstract
Abstract A magnetic disc recorder includes a removably mounted lightweight disc having a shallow air chamber over which is fastened a flexible membrane of recording media. The disc is removably held on a turntable and aligned air passages lead to the interior of the chamber from an external scoop which forces air into the chamber upon rotation. Such pressurization expands the membrane to contact a transducer.
Inventors
- 👤 J Kelley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:54
CPC Classifications
G; G05; G05D; G05D3/00; G05D3/12; G05D3/14; G05D3/1427; G11; G11B; G11B17/00; G11B17/32
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
143 words
A magnetic disc-type recording mechanism comprising a rotatable turntable, a rigid carrier disc having a hub and a shallow air chamber over a substantial part of its surface, a thin flexible membrane fastened to said disc covering said chamber and having a magnetizable outer surface, means for locating said disc on said turntable including a removable cap operating to hold said disc on said turntable for quick removal, an air passage through said disc Providing the sole communication into said chamber, an air scoop facing in the direction of rotation of said turntable and arranged to force air into said passage solely as a result of rotation of the turntable for moving said membrane outward of said chamber, and a magnetic transducer mounted to cooperate effectively with variable flux fields created in the magnetizable surface of said membrane only upon outward movement thereof.
Claim 2
Dependent Claim
143 words
A magnetic disc-type recording mechanism comprising a rotatable turntable, a rigid carrier disc having a hub and a shallow air chamber over a substantial part of its surface, a thin flexible membrane fastened to said disc covering said chamber and having a magnetizable outer surface, means for locating said disc on said turntable including a removable cap operating to hold said disc on said turntable for quick removal, an air passage through said disc Providing the sole communication into said chamber, an air scoop facing in the direction of rotation of said turntable and arranged to force air into said passage solely as a result of rotation of the turntable for moving said membrane outward of said chamber, and a magnetic transducer mounted to cooperate effectively with variable flux fields created in the magnetizable surface of said membrane only upon outward movement thereof.
Claim 3
Dependent Claim
28 words
A recording mechanism as defined in claim 1 including stepping means connected to said transducer and operating to locate said transducer opposite different locations transversely of said membrane.
Claim 4
Dependent Claim
134 words
In a magnetic disc-type recording mechanism including a turntable, means for rotating said turntable at a predetermined speed, a rigid carrier disc having a shallow air chamber on its surface, a magnetic recording media in the form of a thin flexible membrane fastened to said disc extending across said chamber, means for holding said disc on said turntable, an air passage through said disc providing the sole communication between said chamber and the surroundings of said mechanism, and a transducer mounted in spaced relation to said membrane; the improvement comprising an air scoop on said turntable having an entrance facing forward with respect to the direction of rotation of said turntable, said scoop being connected to force air into said passage during rotation of the turntable for moving said membrane outward of said chamber.
Claim 5
Dependent Claim
134 words
In a magnetic disc-type recording mechanism including a turntable, means for rotating said turntable at a predetermined speed, a rigid carrier disc having a shallow air chamber on its surface, a magnetic recording media in the form of a thin flexible membrane fastened to said disc extending across said chamber, means for holding said disc on said turntable, an air passage through said disc providing the sole communication between said chamber and the surroundings of said mechanism, and a transducer mounted in spaced relation to said membrane; the improvement comprising an air scoop on said turntable having an entrance facing forward with respect to the direction of rotation of said turntable, said scoop being connected to force air into said passage during rotation of the turntable for moving said membrane outward of said chamber.
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) | 1976-06-04 | 1976-12-04 | 1977-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-04 | 1980-12-04 | 1981-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-04 | 1984-12-04 | 1985-06-05 | $7700.00 | Window Closed / Lapsed |