US5591501A
Expired / Lapsed
US
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Optical recording medium having a plurality of discrete phase change data recording points
Assignee: Optical Memory Storage LLC
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Filing: 1995-12-20
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Granted: 1997-01-07
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Expires: 2015-12-20
Abstract
Abstract A phase change optical recording medium which includes 1) a substrate having a planar surface; and 2) a plurality of discrete data recording points deposited upon the substrate. The discrete data recording points are formed from a phase change material which changes from a state of a first relative order to a state of a second relative order and visa versa upon the application of optical beam energy. Preferably the phase change material forming the plurality of discrete data recording points is deposited within individual cavities embossed into the surface of the substrate. More preferably the individual cavities are cylindrical or parabolic (bowl shaped) cavities having their central axis perpendicular to the plane of the surface of the substrate.
Inventors
- 👤 Stanford R. Ovshinsky
- 👤 Hellmut Fritzsche
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 10:39
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/2407; G11B7/24085; G11B7/241; G11B7/242; G11B7/243; G11B7/252; G11B7/253; G11B7/2533; G11B2007/24302; G11B2007/24312; G11B2007/24314; G11B2007/24316; G11B7/257; G11B2007/25705; G11B2007/25706; G11B2007/2571; G11B2007/25715; G11B2007/25716; G11B7/004; G11B7/0045; G11B7/00454; G11B7/2534; G11B7/254; G11B7/2542; G11B7/258; G11B7/2585; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10S430/00; Y10S430/146; Y10T; Y10T428/00; Y10T428/21
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
64 words
A phase change optical recording medium including: a substrate having a planar surface; a plurality of discrete data recording points deposited upon said substrate, said discrete data recording points being formed from a phase change material which changes from a state of a first relative order to a state of a second relative order and visa versa upon the application of optical beam energy.
Claim 2
Dependent Claim
64 words
A phase change optical recording medium including: a substrate having a planar surface; a plurality of discrete data recording points deposited upon said substrate, said discrete data recording points being formed from a phase change material which changes from a state of a first relative order to a state of a second relative order and visa versa upon the application of optical beam energy.
Claim 3
Dependent Claim
34 words
The phase change optical recording medium of claim 1, wherein said phase change material forming said plurality of discrete data recording points is deposited within individual cavities formed on the surface of said substrate.
Claim 4
Dependent Claim
34 words
The phase change optical recording medium of claim 2, wherein said individual cavities formed in said substrate are cylindrical cavities having their central axis perpendicular to the plane of said surface of said substrate.
Claim 5
Dependent Claim
34 words
The phase change optical recording medium of claim 2, wherein said individual cavities formed in said substrate are parabolic cavities having their central axis perpendicular to the plane of said surface of said substrate.
Claim 6
Dependent Claim
21 words
The phase change optical recording medium of claim 2, wherein said individual cavities are embossed into said surface of said substrate.
Claim 7
Dependent Claim
20 words
The phase change optical recording medium of claim 1, wherein said phase change material includes at least one chalcogen element.
Claim 8
Dependent Claim
30 words
The phase change optical recording medium of claim 6, wherein said at least one chalcogen element is selected from the group consisting of Te, Se or mixtures or alloys thereof.
Claim 9
Dependent Claim
28 words
The phase change optical recording medium of claim 7, wherein said phase change material additionally includes elements the group consisting of Ge, Sb and mixtures or alloys thereof.
Claim 10
Dependent Claim
44 words
The phase change optical recording medium of claim 8, wherein said phase change material further includes one or more elements selected from the group consisting of Pt, Pd, Cr, Fe, Ni, Bi, Pb, Sn, As, S, Si, P, O and mixtures or alloys thereof.
Claim 11
Dependent Claim
19 words
The phase change optical recording medium of claim 8, wherein said phase change material includes Te, Ge and Sb.
Claim 12
Dependent Claim
57 words
The phase change optical recording medium of claim 1, wherein said phase change material is characterized in that the first state comprises a single phase and said second state comprises either (1) a single phase having the same composition as said first state or (2) a plurality of phases which have substantially similar crystallization temperatures and kinetics.
Claim 13
Dependent Claim
62 words
The phase change optical recording medium of claim 1, wherein said phase change material being of the composition: Te.sub.a Ge.sub.b Sb.sub.c a, b and c being expressed in atomic percentages and selected such that, when said material is in the crystalline state, and it includes a major portion which has the same composition as the material has when in the amorphous state.
Claim 14
Dependent Claim
29 words
The phase change optical recording medium of claim 12, wherein a is from 44 to 53, b is from 18 to 30 and c is from 18 to 30.
Claim 15
Dependent Claim
22 words
The phase change optical recording medium of claim 13, wherein said phase change material further comprises a third portion of varying composition.
Claim 16
Dependent Claim
31 words
The phase change optical recording medium of claim 1, wherein said plurality of discrete data recording points deposited upon said substrate are arranged in linear or curvilinear tracks on said substrate.
Claim 17
Dependent Claim
29 words
The phase change optical recording medium of claim 1, further including a dielectric material deposited between said substrate and each of said a plurality of discrete data recording points.
Claim 18
Dependent Claim
19 words
The phase change optical recording medium of claim 16, wherein said dielectric material comprises a silicon dioxide/zinc sulfide material.
Claim 19
Dependent Claim
29 words
The phase change optical recording medium of claim 16, further including a dielectric material deposited atop said substrate and each of said a plurality of discrete data recording points.
Claim 20
Dependent Claim
19 words
The phase change optical recording medium of claim 18, wherein said dielectric material comprises a silicon dioxide/zinc sulfide material.
Claim 21
Dependent Claim
19 words
The phase change optical recording medium of claim 18, further including a reflective layer deposited over said dielectric layer.
Claim 22
Dependent Claim
19 words
The phase change optical recording medium of claim 20, wherein said reflective layer is formed from a reflective metal.
Claim 23
Dependent Claim
56 words
The phase change optical recording medium of claim 21, wherein the reflectivity of the regions of the disk surface between the discrete data recording points substantially matches the reflectively of said phase change material within the discrete recording points in either its state of a first relative order or its state of a second relative order.
Claim 24
Dependent Claim
19 words
The phase change optical recording medium of claim 21, wherein said reflective metal is aluminum or an aluminum alloy.
Claim 25
Dependent Claim
20 words
The phase change optical recording medium of claim 20, further including a protective polymeric coating deposited atop said reflective layer.
Claim 26
Dependent Claim
34 words
The phase change optical recording medium of claim 20, further including an adhesive coating deposited atop said reflective layer upon which a second optical disk is adhered, thereby forming a two sided optical disk.
Claim 27
Dependent Claim
18 words
The phase change optical recording medium of claim 1, wherein said substrate is formed from a polymeric material.
Claim 28
Dependent Claim
16 words
The phase change optical recording medium of claim 26, wherein said substrate is formed from polycarbonate.
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) | 2000-01-07 | 2000-07-08 | 2001-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-01-07 | 2004-07-08 | 2005-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-01-07 | 2008-07-08 | 2009-01-07 | $7700.00 | Window Closed / Lapsed |