EP0240696A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Optical storage medium
Assignee: International Business Machines Corp
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Filing: 1987-02-27
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Granted: —
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Expires: 2007-02-27
Abstract
Abstract An optical storage medium comprising a substrate having lands and grooves, a reversible phase change active layer above the substrate, and at least one thermally conductive dielectric layer, either between the substrate and the active layer or on top of the active layer, with the grooves in the substrate being of sufficient depth to provide thermal isolation between adjacent lands and grooves.
Inventors
- 👤 Gary Carl Bjorklund
- 👤 Martin Yu-Wen Chen
- 👤 Victor Burr Jipson
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-26 16:14
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/252; G11B7/257; G11B7/2578; G11B7/242; G11B7/243; G11B2007/24302; G11B2007/24312; G11B2007/24314; G11B2007/24316; G11B2007/25705; G11B2007/25706; G11B2007/25708; G11B2007/2571; G11B2007/25713; G11B2007/25715; G11B7/253; G11B7/2533; G11B7/2534
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
62 words
An optical storage medium comprising a substrate having lands and grooves, a reversible phase change active layer above the substrate, and at least one thermally conductive dielectric layer, either between the substrate and the active layer or on top of the active layer, with the grooves in the substrate being of sufficient depth to provide thermal isolation between adjacent lands and grooves.
Claim 2
Dependent Claim
62 words
An optical storage medium comprising a substrate having lands and grooves, a reversible phase change active layer above the substrate, and at least one thermally conductive dielectric layer, either between the substrate and the active layer or on top of the active layer, with the grooves in the substrate being of sufficient depth to provide thermal isolation between adjacent lands and grooves.
Claim 3
Dependent Claim
29 words
An optical storage medium as claimed in claim 1 wherein there are two layers of thermally conductive dielectric material, one layer above and one layer below the active layer.
Claim 4
Dependent Claim
29 words
An optical storage medium as claimed in claim 1 wherein the thermally conductive dielectric layer on top of the active layer is covered by a layer of crystalline material.
Claim 5
Dependent Claim
18 words
An optical storage medium as claimed in claim 1 wherein the grooves are at least 5,000 Angstroms deep.
Claim 6
Dependent Claim
31 words
An optical storage medium as claimed in claim 1 wherein the active layer is approximately 1,000 Angstroms thick and each thermally conductive dielectric layer is between 1,000 and 2,000 Angstroms thick.
References Cited (Backward Citations)
No citation records indexed.
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