Patent EP0439737A1 successfully refreshed from Google Patents.
EP0439737A1
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EP
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Magneto-optic storage media structures
Assignee: International Business Machines Corp
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Filing: 1990-12-07
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Granted: —
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Expires: 2010-12-07
Abstract
Abstract A dielectric layer (14, 18) for use in a magneto-optic storage medium contains a compound glass of SiO₂ - MO₂, SiO₂ - M₂O₃ or SiO₂ - M₂O₅ and combinations thereof where M is selected from Zr, Ti, Al, Nb, Y, Sn, In, Ta and Sb.
Inventors
- 👤 Christopher Vincent Jahnes
- 👤 Fletcher Jones
- 👤 Joseph Skinner Logan
- 👤 Michael Allen Russak
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 06:32
CPC Classifications
G; G11; G11B; G11B11/00; G11B11/10; G11B11/105; G11B11/10582; Y; Y10; Y10S; Y10S428/00; Y10S428/90
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
45 words
A dielectric layer (14, 18) for use in magneto-optic storage media comprising a compound glass of SiO₂ - MO₂, SiO₂ - M₂O₃ or SiO₂ - M₂O₅ where M is selected from the group consisting of Ti, Zr, Al, Nb, Y, Sn, In, Ta and Sb.
Claim 2
Dependent Claim
23 words
A dielectric layer as set forth in claim 1 where the SiO₂ component is sufficient for causing the dielectric layer to be amorphous.
Claim 3
Dependent Claim
26 words
A dielectric layer according to claim 1 or 2, further comprising a glass network modifier, preferably selected from the group consisting of BaO, ZnO and PbO.
Claim 4
Dependent Claim
48 words
A magneto-optic storage medium comprising: a magneto-optic thin film (16) having two surfaces, and a dielectric layer (14, 18) deposited on at least one of said surfaces of said magneto-optic thin film, said dielectric layer comprising a compound glass as recited in any one of the preceding claims.
Claim 5
Dependent Claim
21 words
A magneto-optic storage medium as set forth in claim 4, where said magneto-optic thin film is a rare earth-transition metal alloy.
Claim 6
Dependent Claim
24 words
A magneto-optic storage medium according to claim 4 or 5, where a dielectric layer is deposited on both surfaces of said magneto-optic thin film.
Claim 7
Dependent Claim
58 words
A magneto-optic storage medium comprising: a substrate (10); a first dielectric layer (14) as recited in claim 1, 2 or 3, disposed on said substrate; a magneto-optic thin film layer (16) disposed on said first dielectric layer, and a second dielectric layer (18) as recited in claim 1, 2 or 3, disposed on said magneto-optic thin film layer.
Claim 8
Dependent Claim
25 words
A magneto-optic storage medium as set forth in claim 7, where said substrate has a textured surface on which said first dielectric layer is disposed.
Claim 9
Dependent Claim
32 words
A magneto-optic storage medium as set forth in claim 7 or 8 further comprising a grooved layer disposed on said substrate and said first dielectric layer is disposed on said grooved layer.
Claim 10
Dependent Claim
34 words
A magneto-optic storage medium as set forth in claim 9, further comprising a protective layer disposed over said grooved layer, said first dielectric layer, said magneto-optic thin film layer and said second dielectric layer.
Claim 11
Dependent Claim
19 words
A magneto-optic storage medium according to claim 9 or 10, wherein said grooved layer is a photosensitive polymer material.
Claim 12
Dependent Claim
31 words
A magneto-optic storage medium as set forth in claim 7, further comprising a protective layer disposed over said first dielectric layer, said magneto-optic thin film layer and said second dielectric layer.
Claim 13
Dependent Claim
32 words
A magneto-optic storage medium according to any one of claims 10 to 12, where said substrate is glass, said magneto-optic layer is a rare earth-transition metal and said protective layer is aluminum.
References Cited (Backward Citations)
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