Patent US4774566A successfully refreshed from Google Patents.
Patent US5708653A successfully refreshed from Google Patents.
US5708653A
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US
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Single-substrate multi-layer optical disk for read-only storage and phase change rewritable storage
Assignee: NEC Corp
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Filing: 1996-10-15
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Granted: 1998-01-13
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Expires: 2016-10-15
Abstract
Abstract An optical disk includes a transparent rigid substrate, a phase change rewritable optical recording medium formed on the transparent rigid substrate, a transparent spacer formed on the phase change rewritable optical recording medium and having a grooved surface for storing information, and a reflecting layer formed on the grooved surface of the transparent spacer. The grooved surface of the transparent spacer and the reflecting layer form a read-only recording medium.
Inventors
- 👤 Mitsuya Okada
- 👤 Syuichi Ohkubo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:19
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/84; G11B7/00; G11B7/24; G11B7/241; G11B7/252; G11B7/257; G11B7/2578; G11B7/2403; G11B7/24035; G11B7/24038; G11B7/258; G11B7/242; G11B7/243; G11B2007/24302; G11B2007/24312; G11B2007/24314; G11B2007/24316; G11B2007/25705; G11B2007/25706; G11B2007/2571; G11B2007/25715; G11B2007/25716; G11B2220/00; G11B2220/20; G11B2220/21; G11B2220/215; G11B2220/216; G11B2220/23; G11B2220/235; G11B2220/237; G11B7/004; G11B7/005; G11B7/0052; G11B7/007; G11B7/0079; G11B7/253; G11B7/2531; G11B7/2533; G11B7/2534; G11B7/254; G11B7/2542; G11B7/256; G11B7/2585
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
70 words
An optical disk comprising: a transparent rigid substrate; a phase change rewritable optical recording medium formed on said transparent rigid substrate; a transparent spacer formed on said phase change rewritable optical recording medium and having a grooved surface for storing information; and a reflecting layer formed on the grooved surface of said transparent spacer, the grooved surface of said transparent spacer and said reflecting layer forming a read-only recording medium.
Claim 2
Dependent Claim
70 words
An optical disk comprising: a transparent rigid substrate; a phase change rewritable optical recording medium formed on said transparent rigid substrate; a transparent spacer formed on said phase change rewritable optical recording medium and having a grooved surface for storing information; and a reflecting layer formed on the grooved surface of said transparent spacer, the grooved surface of said transparent spacer and said reflecting layer forming a read-only recording medium.
Claim 3
Dependent Claim
75 words
The optical disk as set forth in claim 1, wherein said phase change rewritable optical recording medium comprises: a transparent lower passivation layer formed on said transparent rigid substrate; a phase change recording layer formed on said transparent lower passivation layer; a transparent upper passivation layer formed on said phase change recording layer; a transparent reflecting layer formed on said transparent upper passivation layer; and a transparent interference layer formed on said transparent reflecting layer.
Claim 4
Dependent Claim
22 words
The optical disk as set forth in claim 2, wherein said phase change recording layer is made of Ge, Sb and Te.
Claim 5
Dependent Claim
35 words
The optical disk as set forth in claim 2, wherein each of said transparent lower passivation layer, said transparent upper passivation layer and said transparent interference layer is made of ZnS and SiO 2 .
Claim 6
Dependent Claim
18 words
The optical disk as set forth in claim 2, wherein said transparent reflecting layer is made of Si.
Claim 7
Dependent Claim
18 words
The optical disk as set forth in claim 2, wherein said transparent reflecting layer is made of Ge.
Claim 8
Dependent Claim
18 words
The optical disk as set forth in claim 2, wherein said transparent reflecting layer is made of SiO.
Claim 9
Dependent Claim
18 words
The optical disk as set forth in claim 2, wherein said transparent reflecting layer is made of SiN.
Claim 10
Dependent Claim
18 words
The optical disk as set forth in claim 2, wherein said transparent reflecting layer is made of GeO.
Claim 11
Dependent Claim
18 words
The optical disk as set forth in claim 2, wherein said transparent reflecting layer is made of GeN.
Claim 12
Dependent Claim
28 words
The optical disk as set forth in claim 2, wherein transmission of laser light for said phase change rewritable optical recording medium is approximately 30 to 60 percent.
Claim 13
Dependent Claim
18 words
The optical disk as set forth in claim 1, wherein said transparent spacer is made of lightsetting resin.
Claim 14
Dependent Claim
19 words
The optical disk as set forth in claim 12, wherein said transparent spacer is approximately 5 to 50 μm.
Claim 15
Dependent Claim
17 words
The optical disk as set forth in claim 1, wherein said reflecting layer is made of metal.
Claim 16
Dependent Claim
119 words
An optical disk comprising first and second disk portions adhered by an adhesive layer, each of said first and second disk portions comprising: a transparent rigid substrate; a phase change rewritable optical recording medium formed on said transparent rigid substrate; a transparent spacer formed on said phase change rewritable optical recording medium and having a grooved surface for storing information; a reflecting layer formed on the grooved surface of said transparent spacer, the grooved surface of said transparent spacer and said reflecting layer forming a read-only recording medium; and an overcoat layer formed on said reflecting layer, said overcoat layer of said first disk portion and said overcoat layer of said second portion being adhered by said adhesive layer.
Claim 17
Dependent Claim
119 words
An optical disk comprising first and second disk portions adhered by an adhesive layer, each of said first and second disk portions comprising: a transparent rigid substrate; a phase change rewritable optical recording medium formed on said transparent rigid substrate; a transparent spacer formed on said phase change rewritable optical recording medium and having a grooved surface for storing information; a reflecting layer formed on the grooved surface of said transparent spacer, the grooved surface of said transparent spacer and said reflecting layer forming a read-only recording medium; and an overcoat layer formed on said reflecting layer, said overcoat layer of said first disk portion and said overcoat layer of said second portion being adhered by said adhesive layer.
Claim 18
Dependent Claim
75 words
The optical disk as set forth in claim 15, wherein said phase change rewritable optical recording medium comprises: a transparent lower passivation layer formed on said transparent rigid substrate; a phase change recording layer formed on said transparent lower passivation layer; a transparent upper passivation layer formed on said phase change recording layer; a transparent reflecting layer formed on said transparent upper passivation layer; and a transparent interference layer formed on said transparent reflecting layer.
Claim 19
Dependent Claim
22 words
The optical disk as set forth in claim 2, wherein said phase change recording layer is made of Ge, Sb and Te.
Claim 20
Dependent Claim
35 words
The optical disk as set forth in claim 16, wherein each of said transparent lower passivation layer, said transparent upper passivation layer and said transparent interference layer is made of ZnS and SiO 2 .
Claim 21
Dependent Claim
18 words
The optical disk as set forth in claim 16, wherein said transparent reflecting layer is made of Si.
Claim 22
Dependent Claim
18 words
The optical disk as set forth in claim 16, wherein said transparent reflecting layer is made of Ge.
Claim 23
Dependent Claim
18 words
The optical disk as set forth in claim 16, wherein said transparent reflecting layer is made of SiO.
Claim 24
Dependent Claim
18 words
The optical disk as set forth in claim 16, wherein said transparent reflecting layer is made of SiN.
Claim 25
Dependent Claim
18 words
The optical disk as set forth in claim 16, wherein said transparent reflecting layer is made of GeO.
Claim 26
Dependent Claim
18 words
The optical disk as set forth in claim 16, wherein said transparent reflecting layer is made of GeN.
Claim 27
Dependent Claim
28 words
The optical disk as set forth in claim 16, wherein transmission of laser light for said phase change rewritable optical recording medium is approximately 30 to 60 percent.
Claim 28
Dependent Claim
18 words
The optical disk as set forth in claim 15, wherein said transparent spacer is made of lightsetting resin.
Claim 29
Dependent Claim
19 words
The optical disk as set forth in claim 26, wherein said transparent spacer is approximately 5 to 50 μm.
Claim 30
Dependent Claim
17 words
The optical disk as set forth in claim 15, wherein said reflecting layer is made of metal.
Claim 31
Independent Claim
123 words
A method for controlling an optical disk including a transparent rigid substrate, a phase change rewritable optical recording medium formed on said transparent rigid substrate, a transparent spacer formed on said phase change rewritable optical recording medium and having a grooved surface for storing information, and a reflecting layer formed on the grooved surface of said transparent spacer, the grooved surface of said transparent spacer and said reflecting layer forming a read-only recording medium, comprising: means for performing a writing, erasing and reproducing operation upon said phase change rewritable optical medium by focusing a laser beam at said phase change rewritable optical medium; and means for performing a reproducing operation upon said read-only medium by focusing a laser beam at said read-only medium.
Claim 32
Independent Claim
123 words
A method for controlling an optical disk including a transparent rigid substrate, a phase change rewritable optical recording medium formed on said transparent rigid substrate, a transparent spacer formed on said phase change rewritable optical recording medium and having a grooved surface for storing information, and a reflecting layer formed on the grooved surface of said transparent spacer, the grooved surface of said transparent spacer and said reflecting layer forming a read-only recording medium, comprising: means for performing a writing, erasing and reproducing operation upon said phase change rewritable optical medium by focusing a laser beam at said phase change rewritable optical medium; and means for performing a reproducing operation upon said read-only medium by focusing a laser beam at said read-only medium.
References Cited (Backward Citations)
US5247494A
Cited
EP0356064A2
Cited
US5218599A
Cited
EP0426409A2
Cited
EP0517490A2
Cited
US5610901A
Cited
US5304440A
Cited
US5422871A
Cited
DE4421221A1
Cited
EP0720159A2
Cited
EP0729142A1
Cited
US5627817A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-01-12 | 2001-07-14 | 2002-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-01-12 | 2005-07-14 | 2006-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-01-12 | 2009-07-14 | 2010-01-13 | $7700.00 | Window Closed / Lapsed |