US4839208A
Expired / Lapsed
US
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Optical information recording medium
Assignee: NEC Corp
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Filing: 1987-04-28
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Granted: 1989-06-13
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Expires: 2007-04-28
Abstract
Abstract An optical information recording medium according to the present invention is featured by its recording layer which contains a compound of tellurium (Te), selenium (Se) and nitrogen (N). The thickness of the recording layer 2 favorably ranges from about 100 angstroms (Å) to about 1000 Å and more favorably from 180 Å to 400 Å. The content of Se in the recording layer 2 favorably lies within a range from 2 to 40 atomic percent, more favorably from 10 to 30 atomic percent. The content of N is favorably to be from 2 to 20 atomic percent, and more favorably from 2 to 10 atomic percent.
Inventors
- 👤 Katsuji Nakagawa
- 👤 Masaki Itoh
- 👤 Akio Morimoto
- 👤 Mitsuru Sakai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:39
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/242; G11B7/243; G11B7/252; G11B7/257; G11B2007/24302; G11B2007/24312; G11B2007/24316; G11B2007/24318; G11B2007/24322; G11B2007/25705; G11B2007/25706; G11B2007/25708; G11B2007/2571; G11B2007/25711; G11B2007/25713; G11B2007/25715; G11B2007/25716; G11B2007/25718; G11B7/004; G11B7/0045; G11B7/00453; G11B7/253; G11B7/2531; G11B7/2533; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/24; Y10T428/24355; Y10T428/26; Y10T428/261
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
76 words
An optical information recording medium, in which information is recorded is recorded by an irradiation of a laser beam, said recording medium comprising a substrate and a recording layer disposed on said substrate, said recording layer containing Te, Se and N and being evaporated by said irradiation of said laser beam so as to form pits in said recording layer, the thickness of said recording layer being in a range from 180 to 400 angstroms (Å).
Claim 2
Dependent Claim
76 words
An optical information recording medium, in which information is recorded is recorded by an irradiation of a laser beam, said recording medium comprising a substrate and a recording layer disposed on said substrate, said recording layer containing Te, Se and N and being evaporated by said irradiation of said laser beam so as to form pits in said recording layer, the thickness of said recording layer being in a range from 180 to 400 angstroms (Å).
Claim 3
Dependent Claim
19 words
The optical information recording medium as claimed in claim 1, said compound of Te, Se, and N being crystallized.
Claim 4
Dependent Claim
27 words
The optical information recording medium as claimed in claim 1, a content of N in said compound being in a range from 2 to 10 atomic percent.
Claim 5
Dependent Claim
26 words
The information recording medium as claimed in claim 1, a content of Se in said compound being in a range from 10 to 30 atomic percent.
Claim 6
Dependent Claim
45 words
The information recording medium as claimed in claim 1, said recording layer further containing at least one element selected from a group consisting of Pb, As, Sn, Ge, Cd, Tl, Sb, S, P, In, Ga, Zn, Bi, Al, Cu, Ag, Mg, Ta, Au and Pd.
Claim 7
Dependent Claim
36 words
The information recording medium as claimed in claim 1, said recording layer further containing at least one element selected from a group consisting of Ti, Zr, Hf, Ru, Rh, Os, Ir, Pt, Ni, Co and Fe.
Claim 8
Dependent Claim
22 words
The information recording medium as claimed in claim 1, further comprising an intermediate layer disposed between said substrate and said recording layer.
Claim 9
Dependent Claim
32 words
The information recording medium as claimed in claim 7, said intermediate layer containing an oxide taken from the group consisting of Ce oxide, Mg oxide, Si monoxide, Si dioxide and Sn dioxide.
Claim 10
Dependent Claim
30 words
The information recording medium as claimed in claim 7, said intermediate layer containing a nitride taken from the group consisting of Si nitride, Zr nitride, Cr nitride and Ti nitride.
Claim 11
Dependent Claim
15 words
The information recording medium as claimed in claim 7, said intermediate layer containing Zn sulfide.
Claim 12
Dependent Claim
32 words
The information recording medium as claimed in claim 7, said intermediate layer containing a fluoride taken from the group consisting of Ce fluoride, La fluoride, Mg fluoride and rare earth elements fluoride.
Claim 13
Dependent Claim
30 words
The information recording medium as claimed in claim 7, said intermediate layer containing a carbide taken from the group consisting of Zr carbide, Si carbide, Cr carbide and Ti carbide.
Claim 14
Dependent Claim
15 words
The information recording medium as claimed in claim 7, said intermediate layer containing Ti boride.
Claim 15
Dependent Claim
27 words
The information recording medium as claimed in claim 7, said intermediate layer containing a Co alloy taken from the group consisting of Co-Cr alloy and Co-Ta alloy.
Claim 16
Dependent Claim
33 words
The information recording medium as claimed in claim 7, said intermediate layer containing a metal lower oxide taken from the group consisting of Ge lower oxide, Ni lower oxide and Co lower oxide.
Claim 17
Dependent Claim
41 words
The information recording medium as claimed in claim 7, said intermediate layer containing a mixture of metal and oxide taken from the group consisting of a mixture of Te-Se alloy and Co oxide and mixture of Te-Se alloy and Ni oxide.
Claim 18
Dependent Claim
31 words
The information medium as claimed in claim 7, wherein said intermediate layer contains an organic compound taken from the group consisting of 3, 4, 9, 10-perylene tetracarboxyl dianhydride and fluorine carbide.
References Cited (Backward Citations)
US4509161A
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US4565772A
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US4668573A
Cited
US4670345A
Cited
JPS6486287A
Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-06-12 | 1992-12-12 | 1993-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-12 | 1996-12-12 | 1997-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-12 | 2000-12-12 | 2001-06-13 | $7700.00 | Window Closed / Lapsed |