US5916730A
Expired / Lapsed
US
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Optical information recording medium and recording method by use of the recording medium
Assignee: Ricoh Co Ltd
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Filing: 1997-01-14
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Granted: 1999-06-29
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Expires: 2017-01-14
Abstract
Abstract An optical information recording medium capable of recording information, reproducing recorded information, erasing recorded information, and rewriting recorded information, is composed of a substrate, a recording layer formed on the substrate, the recording layer including as the main component a four-component phase-change recording material comprising Ag, In, Te and Sb, and containing a crystalline phase composed of the microcrystallites of AgSbTe 2 at the erasure of recorded information, an upper heat resistant protective layer formed on the recording layer, the upper heat resistant protective layer including a heat resistant material with a thermal conductivity of 1.0 W/cm.deg or more, and an optical reflecting layer formed on the upper heat resistant protective layer. Optical information can be recorded in this recording medium by applying a laser beam to the recording layer through the substrate at a linear velocity of disc rotation of 1.2 to 5.6 m/sec.
Inventors
- 👤 Yukio Ide
- 👤 Makoto Harigaya
- 👤 Yoshiyuki Kageyama
- 👤 Hiroko Iwasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:19
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/252; G11B7/257; G11B7/004; G11B7/0055; G11B7/00557; G11B7/242; G11B7/243; G11B7/258; G11B2007/24302; G11B2007/24308; G11B2007/2431; G11B2007/24314; G11B2007/24316; G11B2007/25705; G11B2007/25708; G11B2007/2571; G11B2007/25711; G11B2007/25713; G11B7/253; G11B7/2533; G11B7/2534; G11B7/259; G11B7/2595; Y; Y10; Y10S; Y10S430/00; Y10S430/146; Y10S430/162; Y10S430/165
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
150 words
An optical information recording medium capable of recording information, reproducing recorded information, erasing recorded information, and rewriting recorded information, comprising: a substrate, a recording layer formed on said substrate, said recording layer comprising as the main component a four-component phase-change recording material comprising Ag, In, Te and Sb, and containing a microcrystalline phase comprising the crystallites of AgSbTe 2 at the erasure of recorded information, said phase-change recording material at the erasure of recorded information consisting of a composition represented by (AgSbTe 2 ) x (InSb y ) 1-x , in which InSb y is in an amorphous state and the crystallites of AgSbTe 2 are surrounded by InSb y , wherein 0.4≦x≦0.55 and 0.5≦y≦2.5, an upper heat resistant protective layer formed on said recording layer, said upper heat resistant protective layer comprising a heat resistant material, and an optical reflecting layer formed on said upper heat resistant protective layer.
Claim 2
Dependent Claim
150 words
An optical information recording medium capable of recording information, reproducing recorded information, erasing recorded information, and rewriting recorded information, comprising: a substrate, a recording layer formed on said substrate, said recording layer comprising as the main component a four-component phase-change recording material comprising Ag, In, Te and Sb, and containing a microcrystalline phase comprising the crystallites of AgSbTe 2 at the erasure of recorded information, said phase-change recording material at the erasure of recorded information consisting of a composition represented by (AgSbTe 2 ) x (InSb y ) 1-x , in which InSb y is in an amorphous state and the crystallites of AgSbTe 2 are surrounded by InSb y , wherein 0.4≦x≦0.55 and 0.5≦y≦2.5, an upper heat resistant protective layer formed on said recording layer, said upper heat resistant protective layer comprising a heat resistant material, and an optical reflecting layer formed on said upper heat resistant protective layer.
Claim 3
Dependent Claim
29 words
The optical information recording medium as claimed in claim 1, wherein said crystallites of AgSbTe 2 in said microcrystalline phase is in the range of 1000 Å or less.
Claim 4
Dependent Claim
33 words
The optical information recording medium as claimed in claim 1, wherein said heat resistant material for said upper heat resistant protective layer is selected from the group consisting of cubic-BN, SiC, and AlN.
Claim 5
Dependent Claim
28 words
The optical information recording medium as claimed in claim 1, further comprising a lower heat resistant protective layer which is interposed between said substrate and said recording layer.
Claim 6
Dependent Claim
29 words
The optical information recording medium as claimed in claim 1, wherein said optical reflecting layer comprises a component selected from the group consisting of Ag, Au or alloys thereof.
Claim 7
Dependent Claim
187 words
An optical information recording method, using an optical information medium capable of recording information, reproducing recorded information, erasing recorded information, and rewriting recorded information, comprising a substrate, a recording layer formed on said substrate, said recording layer comprising as the main component a four-component phase-change recording material comprising Ag, In, Te and Sb, and containing a microcrystalline phase comprising the crystallites of AgSbTe 2 at the erasure of recorded information, said phase-change recording material at the erasure of recorded information consisting of a composition represented by (AgSbTe 2 ) x (InSb y ) 1-x , in which InSb y is in an amorphous state and the crystallites of AgSbTe 2 are surrounded by InSb y , wherein 0.4≦x≦0.55 and 0.5≦y≦2.5, an upper heat resistant protective layer formed on said recording layer, said upper heat resistant protective layer comprising a heat resistant material, and an optical reflecting layer formed on said upper heat resistant protective layer, comprising: the step of applying a laser beam to said recording layer through said substrate as the optical information recording medium is rotated at a linear velocity of 1.2 to 5.6 m/sec.
Claim 8
Dependent Claim
187 words
An optical information recording method, using an optical information medium capable of recording information, reproducing recorded information, erasing recorded information, and rewriting recorded information, comprising a substrate, a recording layer formed on said substrate, said recording layer comprising as the main component a four-component phase-change recording material comprising Ag, In, Te and Sb, and containing a microcrystalline phase comprising the crystallites of AgSbTe 2 at the erasure of recorded information, said phase-change recording material at the erasure of recorded information consisting of a composition represented by (AgSbTe 2 ) x (InSb y ) 1-x , in which InSb y is in an amorphous state and the crystallites of AgSbTe 2 are surrounded by InSb y , wherein 0.4≦x≦0.55 and 0.5≦y≦2.5, an upper heat resistant protective layer formed on said recording layer, said upper heat resistant protective layer comprising a heat resistant material, and an optical reflecting layer formed on said upper heat resistant protective layer, comprising: the step of applying a laser beam to said recording layer through said substrate as the optical information recording medium is rotated at a linear velocity of 1.2 to 5.6 m/sec.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-06-28 | 2002-12-28 | 2003-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-06-28 | 2006-12-28 | 2007-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-06-28 | 2010-12-28 | 2011-06-29 | $7700.00 | Window Closed / Lapsed |