US4317150A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Foil recording disk structures
Assignee: International Business Machines Corp
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Filing: 1979-12-10
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Granted: 1982-02-23
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Expires: 1999-12-10
Abstract
Abstract A magnetic recording device employing one or more thin circular foil members which are secured to a supporting member on at least the outer edges of the foil members. In one embodiment, the foil members have central openings therein, with the central opening in one foil member being larger than the opening in the other foil member. A clamping and spacing member is secured to the foil member having the smaller opening and extends through the larger opening in the other foil member to both provide a means for transmitting rotational force to the structure and to provide for spacing between the structure and an adjacent structure in a recording assembly. In an alternate embodiment, one of the foil members has a central opening while the other does not, and rotational force is transmitted through the foil without the central opening. As additional alternatives, the foils may have central openings of equal sizes and be secured to support members either at their outer edges or at both their inner and outer edges.
Inventors
- 👤 Edward G. Gruss
- 👤 Armin R. Tietze
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:20
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/74; G11B5/82; G11B23/00; G11B23/0014; G11B23/0021; G11B23/005; G11B5/825; G11B5/84; G11B5/012; G11B5/016; G11B5/48; G11B5/54
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
111 words
A magnetic recording structure, comprising a cylindrical support member, a pair of circular tensioned metal magnetic foil members secured on opposite sides of said support member, said foil members having central openings therein, said foil members being secured to said support member only at their periphery and being spaced from the remainder of said support member, said support member being a generally cylindrical element having recessed portions on both of its surfaces inwardly of the periphery, said foil members being secured at their periphery to the periphery of said support member and being spaced from said recessed portions; and means for rotating said recording structure past an associated magnetic transducing assembly.
Claim 2
Dependent Claim
111 words
A magnetic recording structure, comprising a cylindrical support member, a pair of circular tensioned metal magnetic foil members secured on opposite sides of said support member, said foil members having central openings therein, said foil members being secured to said support member only at their periphery and being spaced from the remainder of said support member, said support member being a generally cylindrical element having recessed portions on both of its surfaces inwardly of the periphery, said foil members being secured at their periphery to the periphery of said support member and being spaced from said recessed portions; and means for rotating said recording structure past an associated magnetic transducing assembly.
Claim 3
Dependent Claim
144 words
A magnetic recording structure, comprising a cylindrical support member, a pair of circular tensioned metal magnetic foil members secured on opposite sides of said support member, said foil members having central openings therein, said foil members being secured to said support member only at their periphery and being spaced from the remainder of said support member, said support member being a generally cylindrical element having recessed portions on both of its surfaces inwardly of the periphery, said foil members being secured at their periphery to the periphery of said support member and being spaced from said recessed portions, said support member having a raised portion at its inner diameter spaced from said openings in said foil members and extending in both directions through said openings to serve as a spacer element; and means for rotating said recording structure past an associated magnetic transducing assembly.
Claim 4
Dependent Claim
144 words
A magnetic recording structure, comprising a cylindrical support member, a pair of circular tensioned metal magnetic foil members secured on opposite sides of said support member, said foil members having central openings therein, said foil members being secured to said support member only at their periphery and being spaced from the remainder of said support member, said support member being a generally cylindrical element having recessed portions on both of its surfaces inwardly of the periphery, said foil members being secured at their periphery to the periphery of said support member and being spaced from said recessed portions, said support member having a raised portion at its inner diameter spaced from said openings in said foil members and extending in both directions through said openings to serve as a spacer element; and means for rotating said recording structure past an associated magnetic transducing assembly.
Claim 5
Dependent Claim
89 words
A magnetic recording structure comprising a ring member, a pair of circular foil members secured on opposite sides of the periphery of said ring member, at least one of the surfaces of said foil members having magnetic coatings thereon, at least one of said foil members having a central opening therein, both of said foil members having central openings therein, the diameter of one of said central openings being larger than the diameter of the other opening; and means for rotating said structure past an associated magnetic transducer means.
Claim 6
Dependent Claim
89 words
A magnetic recording structure comprising a ring member, a pair of circular foil members secured on opposite sides of the periphery of said ring member, at least one of the surfaces of said foil members having magnetic coatings thereon, at least one of said foil members having a central opening therein, both of said foil members having central openings therein, the diameter of one of said central openings being larger than the diameter of the other opening; and means for rotating said structure past an associated magnetic transducer means.
Claim 7
Dependent Claim
19 words
Apparatus in accordance with claim 3, in which only one of said foil members has a central opening therein.
Claim 8
Dependent Claim
38 words
Apparatus in accordance with claim 3, including a clamping and spacing member secured to said foil member having the smaller diameter and extending through the opening in said other foil member to provide a clamping and spacing member.
Claim 9
Dependent Claim
42 words
Apparatus in accordance with claim 3, including a second ring member concentric with said first ring member and having a diameter less than the diameter of the first ring member, and means for securing said foil members to said second ring member.
Claim 10
Dependent Claim
22 words
Apparatus in accordance with claim 6, including a plurality of such structures spaced from each other to provide a multi-surface recording structure.
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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) | 1985-02-22 | 1985-08-24 | 1986-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-02-22 | 1989-08-24 | 1990-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-02-22 | 1993-08-24 | 1994-02-23 | $7700.00 | Window Closed / Lapsed |