US4866672A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Information-recording thin film and method for recording and reproducing information
Assignee: Hitachi Ltd
•
Filing: 1988-11-14
•
Granted: 1989-09-12
•
Expires: 2008-11-14
Abstract
Abstract An information-recording thin film provided on a substrate directly or through a protective layer has an average composition of the thin film being represented by the general formula; AXBYCZD alpha E beta F gamma wherein X, Y, Z, alpha , beta and gamma are in ranges of 0</=X<30, 0</=Y</=60, 3</=Z</=70, 30</= alpha </=80, 0</= beta 60 and 0</= gamma </=67 in atomic percentage, F is at least one element of As, Sb, Si and Ge; E is at least one element of Cu, Ag, Au, Sc, Y, Ti, Zr, V, Nb, Cr, Mo, Mn, Fe, Co, Rh, Ni, and Pd; D is at least one element of Se and S; C is at least one element of Sn, Pb, Bi, Zn, Cd, Ga and In; B is at least one element of Tl, halogen elements and alkali metal elements; and A is at least one of other elements than those represented by B, C, D, E and F, and records information through changes in the atomic configuration.
Inventors
- 👤 Motoyasu Terao
- 👤 Tetsuya Nishida
- 👤 Yasushi Miyauchi
- 👤 Shinkichi Horigome
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:10
CPC Classifications
G; G11; G11C; G11C13/00; G11C13/0002; G11C13/0009; G11C13/0014; B; B82; B82Y; B82Y10/00; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/242; G11B7/243; G11C13/0004; G11B2007/24302; G11B2007/24304; G11B2007/24308; G11B2007/2431; G11B2007/24312; G11B2007/24314; G11B2007/24316; G11C13/04
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
180 words
An information recording thin film capable of changing an atomic configuration upon exposure to a recording beam, formed on a substrate directly or through a protective layer composed of at least one of inorganic materials and organic materials, an average composition in the film thickness direction of the information-recording thin film being represented by the following general formula: A.sub.X B.sub.Y C.sub.Z D.sub.α E.sub.β F.sub.γ wherein X, Y, Z, α, β and γ are in ranges of 0≦X+β<20, 1≦Y≦30, 25≦Z+γ≦60, 25≦Z≦60 and 35≦α≦70 in atomic percentage, F is at least one element of As, Sb, Si, and Ge; E is at least one element of Cu, Ag, Au, Sc, Y, Ti, Zr, V, Nb, Cr, Mo, Mn, Fe, Co, Rh, Ni, and Pd; D is at least one element of Se and S; C is at least one element of Sn, Pb, Bi, Zn, Cd, Ga and In; B is at least one element of Tl, halogen elements and alkali metal elements; and A is at least one of other elements than those represented by B, C, D, E and F.
Claim 2
Dependent Claim
180 words
An information recording thin film capable of changing an atomic configuration upon exposure to a recording beam, formed on a substrate directly or through a protective layer composed of at least one of inorganic materials and organic materials, an average composition in the film thickness direction of the information-recording thin film being represented by the following general formula: A.sub.X B.sub.Y C.sub.Z D.sub.α E.sub.β F.sub.γ wherein X, Y, Z, α, β and γ are in ranges of 0≦X+β<20, 1≦Y≦30, 25≦Z+γ≦60, 25≦Z≦60 and 35≦α≦70 in atomic percentage, F is at least one element of As, Sb, Si, and Ge; E is at least one element of Cu, Ag, Au, Sc, Y, Ti, Zr, V, Nb, Cr, Mo, Mn, Fe, Co, Rh, Ni, and Pd; D is at least one element of Se and S; C is at least one element of Sn, Pb, Bi, Zn, Cd, Ga and In; B is at least one element of Tl, halogen elements and alkali metal elements; and A is at least one of other elements than those represented by B, C, D, E and F.
Claim 3
Dependent Claim
20 words
An information-recording thin film according to claim 1, wherein the element represented by D in the general formula is Se.
Claim 4
Dependent Claim
20 words
An information-recording thin film according to claim 1, wherein the element represented by C in the general formula is In.
Claim 5
Independent Claim
199 words
A method for recording and reproducing information which comprises a step of exposing to a recording beam an information-recording thin film provided on a substrate direction or through a protective layer, an average composition of the thin being represented by the general formula: A.sub.X B.sub.Y C.sub.Z D.sub.α E.sub.β Fγ wherein X, Y, Z, α, β and γ are in ranges of 0≦X+β<20, 1≦Y≦30, 25≦Z+γ≦60, 25≦Z≦60 and 35≦α≦70 in atomic percentage, F is at least one element of As, Sb, Si, and Ge; E is at least one element of Cu, Ag, Au, Sc, Y, Ti, Zr, V, Nb, Cr, Mo, Mn, Fe, Co, Rh, Ni, and Pd,; D is at least one element of Se and S; C is at lest one element of Sn, Pb, Bi, Zn, Cd, Ga and In; B is at least one element of Tl, halogen elements and alkali metal elements; and A is at least one of other elements than those represented by B, C, D, E and F, thereby changing the atomic configuration at the exposed part of the thin film, and a step of exposing a reproducing beam to the thin film, thereby reading out the change in the atomic configuration.
Claim 6
Independent Claim
199 words
A method for recording and reproducing information which comprises a step of exposing to a recording beam an information-recording thin film provided on a substrate direction or through a protective layer, an average composition of the thin being represented by the general formula: A.sub.X B.sub.Y C.sub.Z D.sub.α E.sub.β Fγ wherein X, Y, Z, α, β and γ are in ranges of 0≦X+β<20, 1≦Y≦30, 25≦Z+γ≦60, 25≦Z≦60 and 35≦α≦70 in atomic percentage, F is at least one element of As, Sb, Si, and Ge; E is at least one element of Cu, Ag, Au, Sc, Y, Ti, Zr, V, Nb, Cr, Mo, Mn, Fe, Co, Rh, Ni, and Pd,; D is at least one element of Se and S; C is at lest one element of Sn, Pb, Bi, Zn, Cd, Ga and In; B is at least one element of Tl, halogen elements and alkali metal elements; and A is at least one of other elements than those represented by B, C, D, E and F, thereby changing the atomic configuration at the exposed part of the thin film, and a step of exposing a reproducing beam to the thin film, thereby reading out the change in the atomic configuration.
Claim 7
Dependent Claim
14 words
A method according to claim 4, wherein the recording beam is a laser beam.
Claim 8
Dependent Claim
18 words
A method according to claim 4, wherein the element represented by D in the general formula is Se.
References Cited (Backward Citations)
US3668663A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-09-11 | 1993-03-13 | 1993-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-11 | 1997-03-13 | 1997-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-11 | 2001-03-13 | 2001-09-12 | $7700.00 | Window Closed / Lapsed |