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US5492773A
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US
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Magneto-optical recording medium
Assignee: Teijin Ltd
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Filing: 1993-06-21
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Granted: 1996-02-20
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Expires: 2013-06-21
Abstract
Abstract A magneto-optical recording medium having an improved durability or reliability is obtained by providing a protecting layer of an alloy of titanium with one or more of chromium, rhenium and tantalum. This titanium alloy protecting layer has an improved resistance to oxygen, water, chlorine, and acids, etc. and provides an improved resistance to the environment and attacks from the synthetic resin substrate or other layers constituting the medium, such as a dielectric layer and a reflecting layer.
Inventors
- 👤 Masahiko Sekiya
- 👤 Kiyoshi Chiba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:35
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/252; G11B11/00; G11B11/10; G11B11/105; G11B11/10582; G11B11/10586; G11B5/00; G11B5/62; G11B5/72; G11B5/726; G11B5/7262; G11B5/7264; G11B7/242; G11B7/243; G11B7/254; G11B7/2548; G11B7/257; G11B7/2578; G11B2007/24302; G11B2007/24306; G11B2007/25705; G11B2007/25706; G11B2007/25708; G11B2007/2571; G11B2007/25713; G11B7/253; G11B7/2533; G11B7/2534; G11B7/2542; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/25; Y10T428/256; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/268
Claims Analysis
Total Claims: 36
Claim 1
Independent Claim
83 words
A magneto-optical recording medium, comprising: a substrate; a magneto-optical recording layer above the substrate; and a first metal protecting layer over the magneto-optical recording layer, the first metal protecting layer being out of an amorphous or crystalline titanium alloy, said crystalline titanium alloy having a lattice spacing of the [002] plane of no greater than 0.2320 nm, wherein said titanium alloy comprises 10 to 80 atom % rhenium, and optionally, at least one member selected from the group consisting of chromium and tantalum.
Claim 2
Dependent Claim
83 words
A magneto-optical recording medium, comprising: a substrate; a magneto-optical recording layer above the substrate; and a first metal protecting layer over the magneto-optical recording layer, the first metal protecting layer being out of an amorphous or crystalline titanium alloy, said crystalline titanium alloy having a lattice spacing of the [002] plane of no greater than 0.2320 nm, wherein said titanium alloy comprises 10 to 80 atom % rhenium, and optionally, at least one member selected from the group consisting of chromium and tantalum.
Claim 3
Dependent Claim
34 words
A magneto-optical recording medium according to claim 1, wherein said titanium alloy comprises 15 to 80 atom % rhenium, and optionally, at least one member selected from the group consisting of chromium and tantalum.
Claim 4
Dependent Claim
34 words
A magneto-optical recording medium according to claim 1, wherein said titanium alloy comprises 30 to 80 atom % rhenium, and optionally, at least one member selected from the group consisting of chromium and tantalum.
Claim 5
Dependent Claim
25 words
A medium according to claim 1, wherein the magneto-optical recording layer is made of an alloy of a rare earth metal and a transition metal.
Claim 6
Dependent Claim
20 words
A medium according to claim 1, further comprises a first dielectric layer between the substrate and the magneto-optical recording layer.
Claim 7
Dependent Claim
63 words
A medium according to claim 1, further comprises a second metal protecting layer in contact with the magneto-optical recording layer and between the first dielectric layer and the magneto-optical recording layer, the second metal protecting layer being made of a titanium alloy comprised of titanium and at least one of rhenium, chromium and tantalum and having a thickness of 1 to 5 nm.
Claim 8
Dependent Claim
18 words
A medium according to claim 1, wherein the first metal protecting layer also serves as a reflecting layer.
Claim 9
Dependent Claim
13 words
The magneto-optical recording medium of claim 3, wherein the titanium alloy contains chromium.
Claim 10
Dependent Claim
13 words
The magneto-optical recording medium of claim 3, wherein the titanium alloy contains tantalum.
Claim 11
Dependent Claim
15 words
The magneto-optical recording medium of claim 3, wherein the titanium alloy contains chromium and tantalum.
Claim 12
Dependent Claim
23 words
A medium according to claim 5, further comprises a second dielectric layer between the magneto-optical recording layer and the first metal protecting layer.
Claim 13
Dependent Claim
118 words
A magneto-recording medium having a protective layer which is resistant to permeation and diffusion of at least one of oxygen, water, chlorine or acids, said medium comprising: a) a substrate; b) a magneto-optical recording layer above the substrate; c) a first metal protecting layer over the magneto-optical recording layer; and d) an organic protecting layer above the first metal protecting layer; said first metal protecting layer being made of an amorphous or crystalline titanium alloy, said crystalline titanium alloy having a lattice spacing of the [002]plane of no greater than 0.2320 nm, wherein said titanium alloy comprises 10 to 80 atom % rhenium, and optionally, at least one member selected from the group consisting of chromium and tantalum.
Claim 14
Dependent Claim
118 words
A magneto-recording medium having a protective layer which is resistant to permeation and diffusion of at least one of oxygen, water, chlorine or acids, said medium comprising: a) a substrate; b) a magneto-optical recording layer above the substrate; c) a first metal protecting layer over the magneto-optical recording layer; and d) an organic protecting layer above the first metal protecting layer; said first metal protecting layer being made of an amorphous or crystalline titanium alloy, said crystalline titanium alloy having a lattice spacing of the [002]plane of no greater than 0.2320 nm, wherein said titanium alloy comprises 10 to 80 atom % rhenium, and optionally, at least one member selected from the group consisting of chromium and tantalum.
Claim 15
Dependent Claim
34 words
A magneto-optical recording medium according to claim 12, wherein said titanium alloy comprises 15 to 80 atom % rhenium, and optionally, at least one member selected from the group consisting of chromium and tantalum.
Claim 16
Dependent Claim
34 words
A magneto-optical recording medium according to claim 12, wherein said titanium alloy comprises 30 to 80 atom % rhenium, and optionally, at least one member selected from the group consisting of chromium and tantalum.
Claim 17
Dependent Claim
25 words
A medium according to claim 12, wherein the magneto-optical recording layer is made of an alloy of a rare earth metal and a transition metal.
Claim 18
Dependent Claim
20 words
A medium according to claim 12, further comprises a first dielectric layer between the substrate and the magneto-optical recording layer.
Claim 19
Dependent Claim
69 words
A medium according to claim 12, further comprises a second metal protecting layer in contact with the magneto-optical recording layer and between the first dielectric layer and the magneto-optical recording layer, the second metal protecting layer being made of a titanium alloy comprised of titanium and at least one member selected from the group consisting of rhenium, chromium and tantalum and having a thickness of 1 to 5 nm.
Claim 20
Dependent Claim
18 words
A medium according to claim 12, wherein the first metal protecting layer also serves as a reflecting layer.
Claim 21
Dependent Claim
13 words
The magneto-optical recording medium of claim 14, wherein the titanium alloy contains chromium.
Claim 22
Dependent Claim
13 words
The magneto-optical recording medium of claim 14, wherein the titanium alloy contains tantalum.
Claim 23
Dependent Claim
15 words
The magneto-optical recording medium of claim 14, wherein the titanium alloy contains chromium and tantalum.
Claim 24
Dependent Claim
23 words
A medium according to claim 16, further comprises a second dielectric layer between the magneto-optical recording layer and the first metal protecting layer.
Claim 25
Dependent Claim
89 words
A magneto-optical recording medium, comprising: a substrate; a magneto-optical recording layer above the substrate; a reflecting layer above the magneto-optical recording layer; and a first metal protecting layer over the reflecting layer, the first metal protecting layer being made of an amorphous or crystalline titanium alloy, said titanium alloy having a lattice spacing of the [002] plane of no greater than 0.2320 nm, wherein said titanium alloy comprises 10 to 80 atom % rhenium, and optionally, at least one member selected from the group consisting of chromium and tantalum.
Claim 26
Dependent Claim
89 words
A magneto-optical recording medium, comprising: a substrate; a magneto-optical recording layer above the substrate; a reflecting layer above the magneto-optical recording layer; and a first metal protecting layer over the reflecting layer, the first metal protecting layer being made of an amorphous or crystalline titanium alloy, said titanium alloy having a lattice spacing of the [002] plane of no greater than 0.2320 nm, wherein said titanium alloy comprises 10 to 80 atom % rhenium, and optionally, at least one member selected from the group consisting of chromium and tantalum.
Claim 27
Dependent Claim
34 words
A magneto-optical recording medium, according to claim 23, wherein said titanium alloy comprises 15 to 80 atom % rhenium, and optionally, at least one member selected from the group consisting of chromium and tantalum.
Claim 28
Dependent Claim
33 words
The magneto-optical recording medium, of claim 23, wherein said titanium alloy comprises 30 to 80 atom % rhenium, and optionally, at least one member selected from the group consisting of chromium and tantalum.
Claim 29
Dependent Claim
25 words
A medium according to claim 23, wherein the magneto-optical recording layer is made of an alloy of a rare earth metal and a transition metal.
Claim 30
Dependent Claim
20 words
A medium according to claim 23, further comprises a first dielectric layer between the substrate and the magneto-optical recording layer.
Claim 31
Dependent Claim
69 words
A medium according to claim 23, further comprises a second metal protecting layer in contact with the magneto-optical recording layer and between the first dielectric layer and the magneto-optical recording layer, the second metal protecting layer being made of a titanium alloy comprised of titanium and at least one member selected from the group consisting of rhenium, chromium and tantalum and having a thickness of 1 to 5 nm.
Claim 32
Dependent Claim
18 words
A medium according to claim 23, wherein the first metal protecting layer also serves as a reflecting layer.
Claim 33
Dependent Claim
13 words
The magneto-optical recording medium of claim 25, wherein the titanium alloy contains chromium.
Claim 34
Dependent Claim
13 words
The magneto-optical recording medium of claim 25, wherein the titanium alloy contains tantalum.
Claim 35
Dependent Claim
15 words
The magneto-optical recording medium of claim 25, wherein the titanium alloy contains chromium and tantalum.
Claim 36
Dependent Claim
23 words
A medium according to claim 27, further comprises a second dielectric layer between the magneto-optical recording layer and the first metal protecting layer.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-02-19 | 1999-08-21 | 2000-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-02-19 | 2003-08-21 | 2004-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-02-19 | 2007-08-21 | 2008-02-20 | $7700.00 | Window Closed / Lapsed |