US5238722A
Expired / Lapsed
US
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Optical recording medium
Assignee: Ricoh Co Ltd
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Filing: 1991-11-26
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Granted: 1993-08-24
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Expires: 2011-11-26
Abstract
Abstract An optical recording medium is composed of a substrate, a recording layer containing an inorganic material which includes as the main component a sulfide of at least one element selected from the group consisting of the elements of IIb, IIIb, IVb, Vb, and VIb groups, which is formed on the substrate, with a complex index of refraction of (n-ik), where n≧1.8, and k≦0.3, and a reflection layer formed on the recording layer. In this invention, an intermediate layer can be interposed either between the substrate and the recording layer, or between the recording layer and the reflection layer.
Inventors
- 👤 Toru Yashiro
- 👤 Yutaka Ueda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:38
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/252; G11B7/258; G11B7/242; G11B7/243; G11B7/257; G11B2007/24302; G11B2007/2431; G11B2007/24312; G11B2007/24314; G11B2007/24318; G11B2007/2432; G11B2007/24324; G11B7/244; G11B7/246; G11B7/247; G11B7/2472; G11B7/253; G11B7/2533; G11B7/2585; G11B7/259; G11B7/2595; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10S430/00; Y10S430/146; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
64 words
An optical recording medium comprising a substrate, a recording layer overlying said substrate, and a reflection layer overlying said recording layer, said recording layer having a complex index of refraction n-ik wherein n≧1.8 and k≦0.3 and consisting essentially of at least one sulfide of at least one element selected from the group consisting of the elements of IIb, IIIb, IVb, Vb and VIb groups.
Claim 2
Dependent Claim
64 words
An optical recording medium comprising a substrate, a recording layer overlying said substrate, and a reflection layer overlying said recording layer, said recording layer having a complex index of refraction n-ik wherein n≧1.8 and k≦0.3 and consisting essentially of at least one sulfide of at least one element selected from the group consisting of the elements of IIb, IIIb, IVb, Vb and VIb groups.
Claim 3
Dependent Claim
25 words
The optical recording medium as claimed in claim 1, wherein said element is selected from the groups consisting of Sb, Sn, In, Ge, and O.
Claim 4
Dependent Claim
81 words
The optical recording medium as claimed in claim 1, wherein said sulfide is selected from the group consisting of Sb 2 S 3 , SnS, (Sb 2 S 3 ) x (In 2 S 3 ) y , (Sb 2 S 3 ) x (GeS) y , (SnS) x (In 2 S 3 ) y , (SnS) x (GeS) y , (SnS) x O y , and (Sb 2 S 3 ) x O y , wherein 40≦x<100, 0<y≦60, and x+y=100.
Claim 5
Dependent Claim
35 words
The optical recording medium as claimed in claim 1, wherein said reflection layer is made of a metal selected from the group consisting of Au, Ag, Cu, Al, Cr, Ni and alloys of these metals.
Claim 6
Dependent Claim
24 words
The optical recording medium as claimed in claim 1, further comprising an undercoat layer which is interposed between said substrate and said recording layer.
Claim 7
Dependent Claim
25 words
The optical recording medium as claimed in claim 1, further comprising an intermediate layer which is interposed between said recording layer and said reflection layer.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-08-23 | 1997-02-22 | 1997-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-08-23 | 2001-02-22 | 2001-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-08-23 | 2005-02-22 | 2005-08-24 | $7700.00 | Window Closed / Lapsed |