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US4531183A
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Information recording material
Assignee: Asahi Kasei Corp
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Filing: 1984-05-18
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Granted: 1985-07-23
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Expires: 2004-05-18
Abstract
Abstract An information recording material comprising a substrate and a metallic recording layer, the metallic recording layer comprising a Bi film containing at least one rare earth element. The information recording material exhibits a remarkably increased sensitivity while maintaining a high S/N ratio. Where the information recording material further comprises at least one stabilizing layer of a metal oxide and/or at least one mixture layer of a metallic compound and a metal, further improvements can be attained with respect to S/N ratio, storage stability and archivability.
Inventors
- 👤 Isao Morimoto
- 👤 Masafumi Nakao
- 👤 Koichi Mori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:37
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/242; G11B7/243; G11B2007/24302; G11B2007/24304; G11B2007/24306; G11B2007/24308; G11B2007/2431; G11B2007/24312; G11B2007/24314; G11B2007/24316; G11B7/252; G11B7/257; G11B2007/25705; G11B2007/25715; G11B7/2433; G11B7/254; G11B7/2542; G11B7/2578; Y; Y10; Y10S; Y10S430/00; Y10S430/146
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
90 words
An information recording material having a high sensitivity, S/N ratio and archivability comprising a substrate and a metallic recording layer having an upper and lower side supported by said substrate, said metallic recording layer comprising a Bi film containing at least one rare earth element selected from the group consisting of Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu, the content of Bi in said metallic recording layer being in the range of 50 to 84% in number of atoms.
Claim 2
Dependent Claim
90 words
An information recording material having a high sensitivity, S/N ratio and archivability comprising a substrate and a metallic recording layer having an upper and lower side supported by said substrate, said metallic recording layer comprising a Bi film containing at least one rare earth element selected from the group consisting of Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu, the content of Bi in said metallic recording layer being in the range of 50 to 84% in number of atoms.
Claim 3
Dependent Claim
42 words
An information recording material according to claim 1, wherein said Bi film further contains at least one element selected from the group consisting of Sb, Sn, Zn, In, Pb, Mg, Au, Ge, Ga, Tl, Cd, As, Rh, Mn, Al, Se and Te.
Claim 4
Dependent Claim
36 words
An information recording material according to claim 1, which further comprises at least one stabilizing layer of a metal oxide provided on at least one of said upper and lower sides of said metallic recording layer.
Claim 5
Dependent Claim
77 words
An information recording material according to claim 3, wherein said stabilizing layer of metal oxide comprises an oxide of at least one metal selected from the group consisting of Be, B, Mg, Al, Si, Ga, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Li, Ge, As, Sr, Y, Zr, Nb, Tc, Ru, Rh, Pd, Ag, In, Sn, Sb, Ba, Ce, La, Hf, Ta, Re, Ir, Tl, Pb, Bi, Dy, Er, Gd, Nd, Pr and Sm.
Claim 6
Dependent Claim
29 words
An information recording material according to claim 3, wherein said Bi film further contains at least one element selected from the group consisting of Sb, Sn, In and Pb.
Claim 7
Dependent Claim
53 words
An information recording material according to claim 3, wherein said stabilizing layer of metal oxide comprises an oxide of at least one metal selected from the group consisting of Si, Al, Ge, Sb, Zr, Ta, Bi, Pb, Zn, Li, Mg, Ti, La, Ce, Y, Dy, Er, Gd, Hf, Sm, Cr, Nd and Pr.
Claim 8
Dependent Claim
49 words
An information recording material according to claim 1, which further comprises at least one stabilizing layer of a metal oxide and at least one mixture layer of a metallic compound and a metal provided on at least one of said upper and lower sides of said metallic recording layer.
Claim 9
Dependent Claim
77 words
An information recording material according to claim 7, wherein said stabilizing layer of metal oxide comprises an oxide of at least one metal selected from the group consisting of Be, B, Mg, Al, Si, Ga, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Li, Ge, As, Sr, Y, Zr, Nb, Tc, Ru, Rh, Pd, Ag, In, Sn, Sb, Ba, Ce, La, Hf, Ta, Re, Ir, Tl, Pb, Bi, Dy, Er, Gd, Nd, Pr and Sm.
Claim 10
Dependent Claim
83 words
An information recording material according to claim 7, wherein said metallic compound in said mixture layer is at least one metallic compound selected from the group consisting of oxides and fluorides of a metal selected from Be, B, Mg, Al, Si, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, As, Sr, Y, Zr, Nb, Tc, Ru, Rh, Pd, Ag, In, Sn, Sb, Ba, La, Hf, Ta, Re, Ir, Tl, Pb, Bi, Dy, Er, Gd, Nd, Pr and Sm.
Claim 11
Dependent Claim
72 words
An information recording material according to claim 7, wherein said metal in the mixture layer is at least one metal selected from the group consisting of Al, Si, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, As, Sr, Y, Zr, Nb, Tc, Ru, Rh, Pd, Ag, In, Sn, Sb, La, Hf, Ta, Re, Ir, Tl, Pb, Bi, Dy, Er, Gd, Nd, Pr, Sm, Mo, Au, Se and Te.
Claim 12
Dependent Claim
53 words
An information recording material according to claim 7, wherein said stabilizing layer of metal oxide comprises an oxide of at least one metal selected from the group consisting of Si, Al, Ge, Sb, Zr, Ta, Bi, Pb, Zn, Li, Mg, Ti, La, Ce, Y, Dy, Er, Gd, Hf, Sm, Cr, Nd and Pr.
Claim 13
Dependent Claim
77 words
An information recording material according to claim 7, wherein said metallic compound in said mixture layer is at least one metallic compound selected from the group consisting of Al 2 O 3 , ZrO 2 , Cr 2 O 3 , GeO 2 , SiO 2 , Bi 2 O 3 , As 2 O 3 , Sb 2 O 3 , Ta 2 O 3 , Sm 2 O 3 and Y 2 O 3 .
Claim 14
Dependent Claim
39 words
An information recording material according to claim 1, which further comprises at least one mixture layer of a metallic compound and a metal provided on at least one of said upper and lower sides of said metallic recording layer.
Claim 15
Dependent Claim
83 words
An information recording material according to claim 13, wherein said metallic compound in said mixture layer is at least one metallic compound selected from the group consisting of oxides and fluorides of a metal selected from Be, B, Mg, Al, Si, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, As, Sr, Y, Zr, Nb, Tc, Ru, Rh, Pd, Ag, In, Sn, Sb, Ba, La, Hf, Ta, Re, Ir, Tl, Pb, Bi, Dy, Er, Gd, Nd, Pr and Sm.
Claim 16
Dependent Claim
72 words
An information recording material according to claim 13, wherein said metal in the mixture layer is at least one metal selected from the group consisting of Al, Si, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, As, Sr, Y, Zr, Nb, Tc, Ru, Rh, Pd, Ag, In, Sn, Sb, La, Hf, Ta, Re, Ir, Tl, Pb, Bi, Dy, Er, Gd, Nd, Pr, Sm, Mo, Au, Se and Te.
Claim 17
Dependent Claim
78 words
An information recording material according to claim 13, wherein said metallic compound in said mixture layer is at least one metallic compound selected from the group consisting of Al 2 O 3 , ZrO 2 , Cr 2 O 3 , GeO 2 , SiO 2 , Bi 2 O 3 , As 2 O 3 , Sb 2 O 3 , Ta 2 O 3 , Sm 2 O 3 , and Y 2 O 3 .
References Cited (Backward Citations)
US4461807A
Cited
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1988-07-22 | 1989-01-21 | 1989-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-22 | 1993-01-21 | 1993-07-23 | $3760.00 | Window Closed / Lapsed |
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