US3840897A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic disc recording assembly
Assignee: Meritor Inc
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Filing: 1972-01-12
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Granted: 1974-10-08
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Expires: 1992-01-12
Abstract
Abstract A magnetic recording system includes a flexible record disc with a magnetizable surface, and a guide finger which engages the underside of the rotating disc and moves a portion of the disc flowing over the finger out of the plane of rotation of the disc. A transducer has its active face mounted close to a channel formed in the guide finger, such that a part of the deflected portion of the flexible disc is captured between the guide finger and the transducer. The flexible disc is part of a sandwich construction including a flexible self-sustaining base attached at its center to the record disc, and a cover extending over the magnetizable surface of the record disc. A hub structure is secured to the record disc and the supporting disc, with the cover having a rotatable connection to the hub structure.
Inventors
- 👤 J Kelley
- 👤 E Waldspurger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:21
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/0014; G11B23/0021; G11B23/0028; G11B23/0035; G11B17/00; G11B17/32; G11B21/00; G11B21/02; G11B21/16; G11B21/20; G11B23/02; G11B23/03; G11B23/033; H; H04; H04N; H04N5/00; H04N5/76; H04N5/78; H04N5/781
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
69 words
A magnetic disc recording assembly comprising a flexible recording disc having a magnetizable surface, hub means connected to the center of said recording disc, a flexiblE backing disc extending across that surface of said recording opposite from said magnetizable surface, and means connecting said backing disc to said recording disc for concurrent rotation and leaving said discs free of direct connection from their periphery inward for a substantial distance.
Claim 2
Dependent Claim
69 words
A magnetic disc recording assembly comprising a flexible recording disc having a magnetizable surface, hub means connected to the center of said recording disc, a flexiblE backing disc extending across that surface of said recording opposite from said magnetizable surface, and means connecting said backing disc to said recording disc for concurrent rotation and leaving said discs free of direct connection from their periphery inward for a substantial distance.
Claim 3
Dependent Claim
57 words
A magnetic disc recording assembly as defined in claim 1, including a protective cover extending over said magnetizable surface and rotatably attached to said hub means leaving said recording disc and said backing disc free to rotate with respect to said cover, and an aperture in said cover providing access to said magnetizable surface for a transducer.
Claim 4
Dependent Claim
113 words
A magnetic record member comprising a flexible disc having a magnetizable surface and being of such flexibility and dimension as to be incapable of self-support in a stationary plane, a flexible backing disc extending across the surface opposite the magnetizable surface, and being of slightly different diameter to accommodate insertion of a member between said discs, said backing disc being sufficiently rigid to maintain itself and said recording disc essentially flat, said discs being connected only in the region of their centers for concurrent rotation, and means forming a hub connected to the assembled said discs at their center providing a drive connection for rotation of said recording disc past a magnetic transducer.
Claim 5
Dependent Claim
113 words
A magnetic record member comprising a flexible disc having a magnetizable surface and being of such flexibility and dimension as to be incapable of self-support in a stationary plane, a flexible backing disc extending across the surface opposite the magnetizable surface, and being of slightly different diameter to accommodate insertion of a member between said discs, said backing disc being sufficiently rigid to maintain itself and said recording disc essentially flat, said discs being connected only in the region of their centers for concurrent rotation, and means forming a hub connected to the assembled said discs at their center providing a drive connection for rotation of said recording disc past a magnetic transducer.
Claim 6
Dependent Claim
62 words
A magnetic recording member as defined in claim 3, wherein said recording disc is substantially thinner than said backing disc, but is of sufficient mass that it tends to remain in a flat plane when rotated at a substantial speed, and to cling to said backing disc by reason of the movement of air outwardly from between said discs during rotation thereof.
Claim 7
Dependent Claim
45 words
A magnetic record member as defined in claim 3, including a thin protective cover disc mounted to said hub over said magnetizable surface, and means providing access to the region beneath said cover for moving a transducer into an active interface with said magnetizable surface.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-07 | 1978-04-08 | 1978-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-07 | 1982-04-08 | 1982-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-07 | 1986-04-08 | 1986-10-08 | $7700.00 | Window Closed / Lapsed |