Patent US3823133A successfully refreshed from Google Patents.
Patent US4769311A successfully refreshed from Google Patents.
US4769311A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Information recording member
Assignee: Hitachi Ltd
•
Filing: 1986-07-10
•
Granted: 1988-09-06
•
Expires: 2006-07-10
Abstract
Abstract In a data recording member having a data recording film which is formed on a substrate either directly or via at least one of inorganic and organic protective layers and which causes the change of atomic arrangement upon being irradiated by recording beam, the improvement wherein said data recording film has an average composition in a direction of the film thickness expressed by the following formulas: M.sub.x Te.sub.y Se.sub.z O.sub.α wherein x, y, z and α are values within the ranges of 2≦x≦40, 30≦y≦95, 3≦z≦45, 0≦α≦20, and M is at least one element selected from the group consisting of As, Sb, Bi, S, Si, Ge, Sn, Pb, Al, Ga, In, Tl, Zn, Cd, Au, Ag, Cu, Ni, Pd, Rh, Cr, Mo, W and Ta.
Inventors
- 👤 Motoyasu Terao
- 👤 Yasushi Miyauchi
- 👤 Kazuo Shigematsu
- 👤 Shinkichi Horigome
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:41
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/252; G11B7/257; G11B7/242; G11B7/243; G11B7/2433; G11B7/004; G11B7/0055; G11B7/00557; G11B2007/24302; G11B2007/24316; G11B2007/24318; G11B2007/2432; G11B2007/25705; G11B2007/25708; G11B2007/2571; G11B2007/25715; G11B7/2572; Y; Y10; Y10S; Y10S430/00; Y10S430/146; Y10S430/165
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
144 words
A method of recording and reproducing information comprising the steps of: (1) providing an information recording film having an average composition, in a direction of the film thickness, expressed by the following formula: M.sub.x Te.sub.y Se.sub.z O.sub.α wherein x, y, z and α are values within the ranges of 2≦x≦40, 30≦y≦95, 3≦z≦45 and 0≦α≦20, and M is at least one element selected from the group consisting of As, Sb, Bi, S, Si, Ge, Sn, Pb, Al, Ga, In, Tl, Zn, Cd, Au, Ag, Cu, Ni, Pd, Rh, Cr, Mo, W and Ta, which is formed on a substrate, (2) irradiating a recording beam to said information recording film to cause a phase transition of said information recording film, said phase transition being a transition between the amorphous and crystalline phases, and (3) detecting the condition of said phase transition of said information recording film.
Claim 2
Independent Claim
144 words
A method of recording and reproducing information comprising the steps of: (1) providing an information recording film having an average composition, in a direction of the film thickness, expressed by the following formula: M.sub.x Te.sub.y Se.sub.z O.sub.α wherein x, y, z and α are values within the ranges of 2≦x≦40, 30≦y≦95, 3≦z≦45 and 0≦α≦20, and M is at least one element selected from the group consisting of As, Sb, Bi, S, Si, Ge, Sn, Pb, Al, Ga, In, Tl, Zn, Cd, Au, Ag, Cu, Ni, Pd, Rh, Cr, Mo, W and Ta, which is formed on a substrate, (2) irradiating a recording beam to said information recording film to cause a phase transition of said information recording film, said phase transition being a transition between the amorphous and crystalline phases, and (3) detecting the condition of said phase transition of said information recording film.
Claim 3
Dependent Claim
15 words
A method as defined in claim 1, wherein the recording beam is a laser beam.
Claim 4
Dependent Claim
21 words
A method as defined in claim 1, wherein the elements expressed by M in said general formula include at least Sn.
Claim 5
Dependent Claim
21 words
A method as defined in claim 1, wherein the elements expressed by M in said general formula include at least In.
Claim 6
Dependent Claim
21 words
A method as defined in claim 1, wherein the elements expressed by M in said general formula include at least Sb.
Claim 7
Dependent Claim
70 words
A method as defined in claim 1, wherein M is a combination of two elements, said combination of two elements being selected from the group consisting of In and Sb, Sn and Ge, Pb and Sn, Sn and Bi, Sn and S, In and Pb, In and Bi, Sb and Bi, Sb and S, Sb and Pb, Sb and Sn, Sb and Ge, As and Sn, and As and Sb.
Claim 8
Dependent Claim
46 words
A method as defined in claim 6, wherein M is a combination of two elements, said combination of two elements being selected from the group consisting of Sn and Ge, Pb and Sn, Sn and Bi, Sn and S, Sb and Sn and As and Sn.
References Cited (Backward Citations)
US3990084A
Cited
US4286045A
Cited
US4238803A
Cited
US4278734A
Cited
US4290075A
Cited
US4348461A
Cited
US4385305A
Cited
US4476214A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-09-06 | 1992-03-07 | 1992-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-06 | 1996-03-07 | 1996-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-06 | 2000-03-07 | 2000-09-06 | $7700.00 | Window Closed / Lapsed |