US5100700A
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Information recording medium
Assignee: Ricoh Co Ltd
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Filing: 1990-02-27
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Granted: 1992-03-31
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Expires: 2010-02-27
Abstract
Abstract An information recording medium comprising a substrate, and a recording layer formed thereon, which comprises as the main component a compound having the following formula: (X.sub.a Y.sub.b Z.sub.c).sub.1-d O.sub.d wherein X is an element selected from the group consisting of the elements belonging to the Ib group and IVb group in the periodic table, Y is an element selected from the group consisting of the elements belonging to the Vb group in the periodic table, Z is an element selected from the group consisting of the elements belonging to the VIb group in the periodic table, and a, b, c, and d fulfill the following conditions: 0.05≦a≦0.35, 0.10≦b≦0.40, 0.40≦c≦0.60, a+b+c=1, and 0.05≦d≦0.20.
Inventors
- 👤 Yukio Ide
- 👤 Makoto Harigaya
- 👤 Katsuyuki Yamada
- 👤 Hiroko Iwasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:45
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/242; G11B7/243; G11B2007/24302; G11B2007/24312; G11B2007/24314; G11B2007/24316; G11B2007/24318; G11B2007/2432; G11B7/252; G11B7/253; G11B7/2531; G11B7/2533; G11B7/2534; Y; Y10; Y10S; Y10S428/00; Y10S428/913
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
112 words
An information recording medium comprising a substrate, and a recording layer formed thereon, which comprises as the main component a compound having the formula of: (X.sub.a Y.sub.b Z.sub.c).sub.1-d O.sub.d wherein X is an element selected from the group consisting of the elements belonging to the Ib group and IVb group in the periodic table, Y is an element selected from the group consisting of the elements belonging to the Vb group in the periodic table, Z is an element selected from the group consisting of the elements belonging to the VIb group in the periodic table, and a, b, c, and d fulfill the conditions of: 0.05≦a≦0.35, 0.10≦b≦0.40, 0.40≦c≦0.60, a+b+c=1, and 0.05≦d≦0.20.
Claim 2
Dependent Claim
112 words
An information recording medium comprising a substrate, and a recording layer formed thereon, which comprises as the main component a compound having the formula of: (X.sub.a Y.sub.b Z.sub.c).sub.1-d O.sub.d wherein X is an element selected from the group consisting of the elements belonging to the Ib group and IVb group in the periodic table, Y is an element selected from the group consisting of the elements belonging to the Vb group in the periodic table, Z is an element selected from the group consisting of the elements belonging to the VIb group in the periodic table, and a, b, c, and d fulfill the conditions of: 0.05≦a≦0.35, 0.10≦b≦0.40, 0.40≦c≦0.60, a+b+c=1, and 0.05≦d≦0.20.
Claim 3
Dependent Claim
63 words
The information recording medium as claimed in claim 1, wherein said compound comprised in said recording layer has the formula of: (X.sub.a Y.sub.b Z.sub.c).sub.1-d O.sub.d wherein X is an element selected from the group consisting of the elements belonging to the Ib group in the periodic table, and a, b, c, and d fulfill the conditions of: 0.15≦a≦0.35, 0.15≦b≦0.35, 0.40≦c≦0.60, a+b+c=1, and 0.05≦d≦0.20.
Claim 4
Dependent Claim
63 words
The information recording medium as claimed in claim 1, wherein said compound comprised in said recording layer has the formula of: (X.sub.a Y.sub.b Z.sub.c).sub.1-d O.sub.d wherein X is an element selected from the group consisting of the elements belonging to the IVb group in the periodic table, and a, b, c, and d fulfill the conditions of: 0.05≦a≦0.30, 0.10≦b≦0.40, 0.40≦c≦0.60, a+b+c=1, and 0.05≦d≦0.20.
Claim 5
Dependent Claim
179 words
The information recording medium as claimed in claim 2, wherein said compound comprised in said recording layer is selected from the group consisting of (Ag a Sb b Te c ) 1-d O d , (Ag a Bi b Te c ) 1-d O d , (Ag a Sb b Se c ) 1-d O d , (Cu a Sb b Te c ) 1-d O d , (Ag a Sb b S c ) 1-d O d , (Ag a Bi b Se c ) 1-d O d , (Ag a Bi b S c ) 1-d O d , (Cu a Sb b Se c ) 1-d O d , (Cu a Sb b S c ) 1-d O d , (Cu a Bi b Se c ) 1-d O d , (Cu a Bi b S c ) 1-d O d , (Ag a As b Te c ) 1-d O d , (Ag a As b Se c ) 1-d O d , and (Ag a As b S c ) 1-d O d ,
Claim 6
Dependent Claim
23 words
The information recording medium as claimed in claim 3, wherein said X is Ge, said Y is Sb, and said Z is Te.
Claim 7
Dependent Claim
22 words
The information recording medium as claimed in claim 1, wherein the thickness of said recording layer is 200 Å to 10,000 Å.
Claim 8
Dependent Claim
26 words
The information recording medium as claimed in claim 1, wherein the material for said substrate is selected from the group consisting of glass, ceramics, and resins.
Claim 9
Dependent Claim
15 words
The information recording medium as claimed in claim 1, further comprising a heat-resistant protective layer.
Claim 10
Dependent Claim
23 words
The information recording medium as claimed in claim 8, wherein the thickness of said heat-resistant protective layer is 200 Å to 5,000 Å.
Claim 11
Dependent Claim
84 words
The information recording medium as claimed in claim 8, wherein the material for said heat-resistant protective layer is selected from the group consisting of metal oxides such as SiO, SiO 2 , ZnO, SnO 2 , Al 2 O 3 , TiO 2 , In 2 O 3 , MgO and ZrO 2 , nitrides such as Si 3 N 4 , AlN, TiN, BN and ZrN, carbides such as SiC, TaC, B 4 C, WC, TiC and ZrC, diamond-like carbon, and mixtures thereof.
References Cited (Backward Citations)
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) | 1995-03-31 | 1995-09-30 | 1996-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-03-31 | 1999-09-30 | 2000-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-03-31 | 2003-09-30 | 2004-03-31 | $7700.00 | Window Closed / Lapsed |