EP0564260A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Optical recording medium and optical recording/reproducing apparatus
Assignee: Toshiba Corp
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Filing: 1993-03-30
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Granted: —
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Expires: 2013-03-30
Abstract
Abstract An optical recording medium comprises a transparent substrate (103), an inner protection layer (104), a recording material layer (105), an outer protection layer (106), and a reflection layer (107), which are laminated in this order. In an in-groove recording mode, the ratio of the thickness of the recording material layer (105) to the thickness of the outer protection layer (106) is in a range between 0.52 and 0.95. In an on-land recording mode, the ratio of the thickness of the recording material layer (105) to the thickness of the outer protection layer (106) is in a range between 0.32 and 0.6. <IMAGE>
Inventors
- 👤 Yoshinori c/o Intellectual Property Div. Honguh
- 👤 Toyoki C/O Intellectual Property Div. Taguchi
- 👤 Hiroshi c/o Intellectual Property Div. Hasegawa
- 👤 Tadashi c/o Intellectual Property Div. Kobayashi
- 👤 Noaki c/o Intellectual Property Div. Morishita
- 👤 Naomasa C/O Intellectual Property Div. Nakamura
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 03:38
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/252; G11B7/258; G11B7/2585; G11B7/2407; G11B7/24073; G11B7/24076; G11B7/24079; G11B7/242; G11B7/243; G11B7/254; G11B7/257; G11B2007/24302; G11B2007/24312; G11B2007/24314; G11B2007/24316; G11B7/253; G11B7/2533; G11B7/2534; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10S430/00; Y10S430/146; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
86 words
An optical recording medium comprising: a transparent substrate (103); an inner protection layer (104) formed on the transparent substrate; a recording material layer (105) formed on the inner protection layer; an outer protection layer (106) formed on the recording material layer; and a reflection layer (107) formed on the outer protection layer, characterized in that the ratio of the thickness of the recording material layer to the thickness of the outer protection layer in an in-groove recording mode is in a range between 0.52 and 0.95.
Claim 2
Dependent Claim
74 words
The optical recording medium according to claim 1, characterized in that the transparent substrate (103) is formed of a polycarbonate resin, the inner protection layer (104) and the outer protection layer (106) are formed of ZnSiO₂, the recording material layer (105) is formed of a GeSbTe-based phase-variation recording material, and the reflection layer (107) is formed of Aℓ (aluminum), and the Ge-Sb-Te ratio of the recording material layer is 2 : 2 : 5.
Claim 3
Dependent Claim
57 words
The optical recording medium according to claim 2, characterized in that the thickness of the inner protection layer (104) is set at 240 nm, the thickness of the outer protection layer (106) is set at 25 nm, and the thickness of the recording material layer (105) is set in a range between 15 nm and 23 nm.
Claim 4
Dependent Claim
56 words
The optical recording medium according to claim 2, characterized in that the thickness of the inner protection layer is set at 100 nm, the thickness of the outer protection layer (104) is set at 20 nm, and the thickness of the recording material layer (105) is set in a range between 18 nm and 30 nm.
Claim 5
Dependent Claim
86 words
An optical recording medium comprising: a transparent substrate (103); an inner protection layer (104) formed on the transparent substrate; a recording material layer (105) formed on the inner protection layer; an outer protection layer (106) formed on the recording material layer; and a reflection layer (107) formed on the outer protection layer, characterized in that the ratio of the thickness of the recording material layer to the thickness of the inner protection layer in an in-groove recording mode is in a range between 0.053 and 0.098.
Claim 6
Dependent Claim
73 words
The optical recording medium according to claim 5, characterized in that the transparent substrate (103) is formed of a polycarbonate resin, the inner protection layer (104) and the outer protection layer (106) are formed of ZnSiO₂, the recording material layer is formed of a GeSbTe-based phase-variation recording material, and the reflection layer (107) is formed of Aℓ (aluminum), and the Ge-Sb-Te ratio of the recording material layer is 2 : 2 : 5.
Claim 7
Dependent Claim
57 words
The optical recording medium according to claim 6, characterized in that the thickness of the inner protection layer (104) is set at 100 nm, the thickness of the outer protection layer (106) is set at 20 nm, and the thickness of the recording material layer (105) is set in a range between 15 nm and 23 nm.
Claim 8
Dependent Claim
56 words
The optical recording medium according to claim 5, characterized in that the thickness of the inner protection layer (104) is set at 100 nm, the thickness of the outer protection layer (106) is set at 20 nm, and the thickness of the recording material layer is set in a range between 18 nm and 30 nm.
Claim 9
Dependent Claim
86 words
An optical recording medium comprising: a transparent substrate (103); an inner protection layer (104) formed on the transparent substrate; a recording material layer (105) formed on the inner protection layer; an outer protection layer (106) formed on the recording material layer; and a reflection layer (107) formed on the outer protection layer, characterized in that the ratio of the thickness of the recording material layer to the thickness of the outer protection layer in an on-land recording mode is in a range between 0.32 and 0.6.
Claim 10
Dependent Claim
74 words
The optical recording medium according to claim 9, characterized in that the transparent substrate (103) is formed of a polycarbonate resin, the inner protection layer (104) and the outer protection layer (106) are formed of ZnSiO₂, the recording material layer (105) is formed of a GeSbTe-based phase-variation recording material, and the reflection layer (107) is formed of Aℓ (aluminum), and the Ge-Sb-Te ratio of the recording material layer is 2 : 2 : 5.
Claim 11
Dependent Claim
57 words
The optical recording medium according to claim 10, characterized in that the thickness of the inner protection layer (104) is set at 100 nm, the thickness of the outer protection layer (106) is set at 20 nm, and the thickness of the recording material layer (105) is set in a range between 10 nm and 17 nm.
Claim 12
Dependent Claim
57 words
The optical recording medium according to claim 10, characterized in that the thickness of the inner protection layer (104) is set at 100 nm, the thickness of the outer protection layer (106) is set at 20 nm, and the thickness of the recording material layer (105) is set in a range between 10 nm and 19 nm.
Claim 13
Dependent Claim
86 words
An optical recording medium comprising: a transparent substrate (103); an inner protection layer (104) formed on the transparent substrate; a recording material layer (105) formed on the inner protection layer; an outer protection layer (106) formed on the recording material layer; and a reflection layer (107) formed on the outer protection layer, characterized in that the ratio of the thickness of the recording material layer to the thickness of the inner protection layer in an on-land recording mode is in a range between 0.033 and 0.063.
Claim 14
Dependent Claim
74 words
The optical recording medium according to claim 13, characterized in that the transparent substrate (103) is formed of a polycarbonate resin, the inner protection layer (104) and the outer protection layer (106) are formed of ZnSiO₂, the recording material layer (105) is formed of a GeSbTe-based phase-variation recording material, and the reflection layer (107) is formed of Aℓ (aluminum), and the Ge-Sb-Te ratio of the recording material layer is 2 : 2 : 5.
Claim 15
Dependent Claim
57 words
The optical recording medium according to claim 14, characterized in that the thickness of the inner protection layer (104) is set at 100 nm, the thickness of the outer protection layer (106) is set at 20 nm, and the thickness of the recording material layer (105) is set in a range between 10 nm and 17 nm.
Claim 16
Dependent Claim
57 words
The optical recording medium according to claim 14, characterized in that the thickness of the inner protection layer (104) is set at 100 nm, the thickness of the outer protection layer (106) is set at 20 nm, and the thickness of the recording material layer (105) is set in a range between 10 nm and 19 nm.
Claim 17
Dependent Claim
97 words
An optical recording medium having a tracking guide groove (109) within which a record mark representing information is formed, on and from which information is recorded and reproduced by use of a light beam passing through an objective lens (102), characterized in that the guide groove (109) is constituted such that the ratio of the average value of widths of upper to lower portions of the guide groove to a value obtained by dividing the wavelength of the light beam by the numerical aperture of the objective lens is set in a range of 0.25 to 0.4.
Claim 18
Dependent Claim
108 words
An optical recording medium having tracking guide grooves (109) between which a record mark representing information is formed, on and from which information is recorded and reproduced by use of a light beam focused by an objective lens (102), characterized in that each of the guide grooves (109) is constituted such that the ratio of a value obtained by subtracting the average value of widths of upper to lower portions of the guide groove (109) from a track pitch to a value obtained by dividing the wavelength of the light beam by the numerical aperture of the objective lens is set in a range of 0.25 to 0.4.
References Cited (Backward Citations)
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