Patent US5294523A successfully refreshed from Google Patents.
US5294523A
Expired / Lapsed
US
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Optical information recording medium
Assignee: Panasonic Holdings Corp
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Filing: 1993-05-06
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Granted: 1994-03-15
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Expires: 2013-05-06
Abstract
Abstract A rewritable phase-change type optical information recording medium having a recording film made of a material containing Te or In as a major component and further containing B or C.
Inventors
- 👤 Ken'chi Nagata
- 👤 Susumu Sanai
- 👤 Noboru Yamada
- 👤 Masatoshi Takao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:05
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/242; G11B7/243; G11B2007/24302; G11B2007/2431; G11B2007/24316; G11B2007/24318; G11B2007/24328; G11B7/252; G11B7/257; G11B2007/25705; G11B2007/25708; G11B2007/25711; G11B7/004; G11B7/0055; G11B7/00557; Y; Y10; Y10S; Y10S430/00; Y10S430/146; Y10S430/165
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
94 words
An optical information recording medium comprising, at least, a substrate and a recording film composition on said substrate, which recording film composition transforms repetitively from amorphous phase into crystalline phase or vice versa to make it possible to effect repetition of recording and erasing, wherein the recording film composition is expressed by (Ge x Sb y Te z ) 1- α B.sub.α meeting the following conditions: 0.10≦x≦0.35 0.10≦y 0.45≦z≦0.65 x+y+z=1 0.05≦α≦0.4 such optical information recording medium exhibiting excellent performance against repeated recording and erasing while widening a range of fluctuation of recording power thereof.
Claim 2
Dependent Claim
94 words
An optical information recording medium comprising, at least, a substrate and a recording film composition on said substrate, which recording film composition transforms repetitively from amorphous phase into crystalline phase or vice versa to make it possible to effect repetition of recording and erasing, wherein the recording film composition is expressed by (Ge x Sb y Te z ) 1- α B.sub.α meeting the following conditions: 0.10≦x≦0.35 0.10≦y 0.45≦z≦0.65 x+y+z=1 0.05≦α≦0.4 such optical information recording medium exhibiting excellent performance against repeated recording and erasing while widening a range of fluctuation of recording power thereof.
Claim 3
Dependent Claim
67 words
An optical information recording medium comprising, at least, a substrate and a recording film composition on said substrate, which recording film composition transforms repetitively from amorphous phase into crystalline phase or vice versa to make it possible to effect repetition of recording and erasing, wherein the recording film composition is expressed by (Ge 2 Sb 2 Te 5 ) 1- α B.sub.α meeting the following condition: 0.05≦α≦0.4.
Claim 4
Dependent Claim
67 words
An optical information recording medium comprising, at least, a substrate and a recording film composition on said substrate, which recording film composition transforms repetitively from amorphous phase into crystalline phase or vice versa to make it possible to effect repetition of recording and erasing, wherein the recording film composition is expressed by (Ge 2 Sb 2 Te 5 ) 1- α B.sub.α meeting the following condition: 0.05≦α≦0.4.
Claim 5
Dependent Claim
94 words
An optical information recording medium comprising, at least, a substrate and a recording film composition on said substrate, which recording film composition transforms repetitively from amorphous phase into crystalline phase or vice versa to make it possible to effect repetition of recording and erasing, wherein the recording film composition is expressed by (Ge x Sb y Te z ) 1- α C.sub.α meeting the following conditions: 0.10≦x≦0.35 0.10≦y 0.45≦z≦0.65 x+y+z=1 0.05≦α≦0.4 such optical information recording medium exhibiting excellent performance against repeated recording and erasing while widening a range of fluctuation of recording power thereof.
Claim 6
Dependent Claim
94 words
An optical information recording medium comprising, at least, a substrate and a recording film composition on said substrate, which recording film composition transforms repetitively from amorphous phase into crystalline phase or vice versa to make it possible to effect repetition of recording and erasing, wherein the recording film composition is expressed by (Ge x Sb y Te z ) 1- α C.sub.α meeting the following conditions: 0.10≦x≦0.35 0.10≦y 0.45≦z≦0.65 x+y+z=1 0.05≦α≦0.4 such optical information recording medium exhibiting excellent performance against repeated recording and erasing while widening a range of fluctuation of recording power thereof.
Claim 7
Dependent Claim
65 words
An optical information recording medium comprising, at least, a substrate and a recording film composition on said substrate, which recording film composition transforms repetitively from amorphous phase into crystalline phase or vice versa to make it possible to effect repetition of recording and erasing, wherein the recording film composition is expressed by (Ge 2 Sb 2 Te 5 ) 1- α C.sub.α meeting condition: 0.05≦α≦0.4.
Claim 8
Dependent Claim
65 words
An optical information recording medium comprising, at least, a substrate and a recording film composition on said substrate, which recording film composition transforms repetitively from amorphous phase into crystalline phase or vice versa to make it possible to effect repetition of recording and erasing, wherein the recording film composition is expressed by (Ge 2 Sb 2 Te 5 ) 1- α C.sub.α meeting condition: 0.05≦α≦0.4.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1997-03-14 | 1997-09-13 | 1998-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-03-14 | 2001-09-13 | 2002-03-15 | $3760.00 | Window Closed / Lapsed |
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