US5348783A
Expired / Lapsed
US
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Optical information recording medium
Assignee: Panasonic Holdings Corp
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Filing: 1993-05-26
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Granted: 1994-09-20
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Expires: 2013-05-26
Abstract
Abstract An optical information recording medium comprising a substrate, and a dielectric layer, a recording layer, a dielectric layer and a reflective layer which are laminated on the substrate in this order or a reflective layer, a dielectric layer, a recording layer and a dielectric layer which are laminated on the substrate in this order, wherein the recording layer comprises alternately laminated at least two optically active layers and at least one amorphous-acceleration layer; each of the optically active layers having a thickness of from 1 nm to 10 nm; the thickness d1 of each of the optically active layers and the thickness d2 of the amorphous-acceleration layer satisfying the equation: 1/3</=d1/d2</=3.
Inventors
- 👤 Eiji Ohno
- 👤 Noboru Yamada
- 👤 Kenichi Nagata
- 👤 Kenichi Nishiuchi
- 👤 Nobuo Akahira
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:58
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/252; G11B7/257; G11B7/242; G11B7/243; G11B2007/24302; G11B2007/24308; G11B2007/2431; G11B2007/24312; G11B2007/24314; G11B2007/24316; G11B2007/25705; G11B2007/25706; G11B2007/25708; G11B2007/2571; G11B2007/25713; G11B2007/25715; G11B2007/25716; G11B7/253; G11B7/2531; G11B7/2533; G11B7/258; G11B7/2595; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10S430/00; Y10S430/146; Y10T; Y10T428/00; Y10T428/31504
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
157 words
An optical information recording medium comprising a substrate, and a dielectric layer, a recording layer and a dielectric layer which are laminated on said substrate in this order, or a dielectric layer,a recording layer, a dielectric layer and a reflective layer which are laminated on said substrate in this order, or a reflective layer, a dielectric layer, a recording layer and a dielectric layer which are laminated on said substrate in this order, wherein said recording layer comprises alternately laminated at least two optically active layers the state of each of which is reversibly changed between optically recognizable states by irradiation and at least one amorphous-acceleration layer comprising a dielectric material, each of said optically active layers having a thickness of from 1 nm to 10 nm, and wherein the thickness d 1 of each of said optically active layers and the thickness d 2 of said amorphous-acceleration layer satisfy the equation: 1/3≦d 1 /d 2 ≦3.
Claim 2
Dependent Claim
157 words
An optical information recording medium comprising a substrate, and a dielectric layer, a recording layer and a dielectric layer which are laminated on said substrate in this order, or a dielectric layer,a recording layer, a dielectric layer and a reflective layer which are laminated on said substrate in this order, or a reflective layer, a dielectric layer, a recording layer and a dielectric layer which are laminated on said substrate in this order, wherein said recording layer comprises alternately laminated at least two optically active layers the state of each of which is reversibly changed between optically recognizable states by irradiation and at least one amorphous-acceleration layer comprising a dielectric material, each of said optically active layers having a thickness of from 1 nm to 10 nm, and wherein the thickness d 1 of each of said optically active layers and the thickness d 2 of said amorphous-acceleration layer satisfy the equation: 1/3≦d 1 /d 2 ≦3.
Claim 3
Dependent Claim
26 words
The optical information recording medium according to claim 1, wherein the thickness of each of said optically active layers is from 2 nm to 8 nm.
Claim 4
Dependent Claim
30 words
The optical information recording medium according to claim 1, wherein said optically active layers comprise a phase-change material which is reversibly converted between a crystalline state and an amorphous state.
Claim 5
Dependent Claim
32 words
The optical information recording medium according to claim 1, wherein said optically active layers comprise at least one alloy selected from the group consisting of GeSeTe, InSbTe, GaSb, InGaSb, GeSnTe and AgSbTe.
Claim 6
Dependent Claim
50 words
The optical information recording medium according to claim 1, wherein said amorphous-acceleration layer comprises at least one material selected from the group consisting of Al 2 O 3 , TiO 2 , WO 3 , Si 3 N 4 , AlN, BN, TiN, ZnS, ZnSe, SiC and ZnS-SiO 2 .
Claim 7
Dependent Claim
23 words
The optical information recording medium according to claim 1, wherein said amorphous-acceleration layer and said dielectric layer are made of the same material.
Claim 8
Dependent Claim
49 words
The optical information recording medium according to claim 1, wherein said optically active layers comprise an alloy which comprises M, Te and Ge and has a composition of the formula: M x Ge y Te z wherein 25 ≦x≦60, 0≦y≦25 and 37.5≦z≦60, and wherein m represents Sn or Pb.
Claim 9
Dependent Claim
21 words
The optical information recording medium according to claim 7, wherein said alloy is M 50-a Ge a Te 50 wherein 0≦a≦25.
Claim 10
Dependent Claim
18 words
The optical information recording medium according to claim 1, wherein said optically active layers comprise SnTe or PbTe.
Claim 11
Dependent Claim
50 words
The optical information recording medium according to claim 1, wherein said optically active layers comprise an alloy containing Sn, Sb and Te and having a composition in which the deviation of the content of each element is within ±5 atomic percentages from the stoichiometric composition SnSb 2 Te 4 .
Claim 12
Dependent Claim
35 words
The optical information recording medium according to claim 1, wherein said optically active layers comprise an alloy containing Sn, Sb, Te and Ge in which the concentration of Ge is smaller than that of Sn.
Claim 13
Dependent Claim
25 words
The optical information recording medium according to claim 11, wherein said optically active layers comprise Sn 1-b Ge b Sb 2 Te 4 wherein 0<b<0.5.
Claim 14
Dependent Claim
52 words
The optical information recording medium according to claim 1, wherein said optically active layers comprise an alloy containing Pb, Sb and Te and having a composition in which the deviation of the content of each element is within ±5 atomic percentages from the stoichiometric composition Pb 2 Sb 6 Te 11 .
Claim 15
Dependent Claim
35 words
The optical information recording medium according to claim 1, wherein said optically active layers comprise an alloy containing Pb, Sb, Te and Ge in which the concentration of Ge is smaller than that of Pb.
Claim 16
Dependent Claim
25 words
The optical information recording medium according to claim 14, wherein said optically active layers comprise Pb 2-c Ge c Sb 6 Te 11 wherein 0<c<1.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1997-09-19 | 1998-03-21 | 1998-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-09-19 | 2002-03-21 | 2002-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-09-19 | 2006-03-21 | 2006-09-20 | $7700.00 | Window Closed / Lapsed |