US5523140A
Expired / Lapsed
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Optical recording method and medium
Assignee: TDK Corp
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Filing: 1995-03-08
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Granted: 1996-06-04
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Expires: 2015-03-08
Abstract
Abstract A phase change type optical recording medium has a recording layer of a recording material containing elements A, B, and C wherein A is Ag and/or Au, B is Sb and/or Bi, and C is Te and/or Se. Information is recorded by directing a light beam to the recording layer to form recorded marks therein such that the recorded marks are amorphous or microcrystalline while an unrecorded portion of the recording layer remains crystalline, and the A concentration of the unrecorded portion is at least 0.5 atom % higher than the A concentration of the recorded marks. C/N and modulation factor are improved and such improvements are kept even after hot humid storage.
Inventors
- 👤 Junji Tominaga
- 👤 Tokuhiko Handa
- 👤 Susumu Haratani
- 👤 Ryo Inaba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:28
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/242; G11B7/243; G11B7/004; G11B7/0045; G11B7/00454; G11B2007/24302; G11B2007/24308; G11B2007/24314; G11B2007/24316; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10S430/00; Y10S430/146; Y10T; Y10T428/00; Y10T428/21
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
165 words
An optical recording medium having a recording layer for recording information by directing a light beam to the recording layer to form recorded marks therein and comprising: said recording layer comprising a recording material containing elements A, B and C, wherein 1) A is at least one of silver and gold and containing at least 50 atom % of silver 2), B is at least one of antimony and bismuth and containing at least 50 atom % of antimony 3), and C is at least one of tellurium and selenium and containing at least 50 atom % of tellurium; the recorded marks are at least one of being amorphous and microcrystalline and an unrecorded portion of said recording layer remains crystalline; and a differential A concentration given by the A concentration of the unrecorded portion minus the A concentration of the recorded marks is at least 0.5 atom % and up to 5 atom %, and the recording layer is 100 to 500 Å thick.
Claim 2
Dependent Claim
165 words
An optical recording medium having a recording layer for recording information by directing a light beam to the recording layer to form recorded marks therein and comprising: said recording layer comprising a recording material containing elements A, B and C, wherein 1) A is at least one of silver and gold and containing at least 50 atom % of silver 2), B is at least one of antimony and bismuth and containing at least 50 atom % of antimony 3), and C is at least one of tellurium and selenium and containing at least 50 atom % of tellurium; the recorded marks are at least one of being amorphous and microcrystalline and an unrecorded portion of said recording layer remains crystalline; and a differential A concentration given by the A concentration of the unrecorded portion minus the A concentration of the recorded marks is at least 0.5 atom % and up to 5 atom %, and the recording layer is 100 to 500 Å thick.
Claim 3
Dependent Claim
20 words
The optical recording medium of claim 1, wherein the recording material contains 3.0 to 28 atom % of element A.
Claim 4
Dependent Claim
16 words
The optical recording medium of claim 1, wherein the unrecorded portion contains an ABC 2 phase.
Claim 5
Dependent Claim
22 words
The optical recording medium of claim 3, wherein the recording material further contains indium and the unrecorded portion contains and In--C phase.
Claim 6
Dependent Claim
16 words
The optical recording medium of claim 1, wherein the unrecorded portion further contains a B phase.
Claim 7
Dependent Claim
22 words
The optical recording medium of claim 1, wherein the recording material further contains indium and the unrecorded portion contains an In--C phase.
Claim 8
Dependent Claim
57 words
The optical recording medium of claim 6, wherein the recording material is represented by the formula: A.sub.a B.sub.b C.sub.c In.sub.d M.sub.e wherein A, B, C and M are as defined above and letters a, b, c, d, and e are representative of an atomic ratio and are in the range: 3.0≦a≦13.0 45.0≦b≦87.0 8.0≦c≦34.0 2.0≦d≦8.0 0≦e≦5.0, and a+b+c+d+e=100.
Claim 9
Dependent Claim
57 words
The optical recording medium of claim 1, wherein the recording material is represented by the formula: A.sub.a B.sub.b C.sub.c In.sub.d M.sub.e wherein A, B, C and M are as defined above and letters a, b, c, d, and e are representative of an atomic ratio and are in the range: 3.0≦a≦13.0 45.0≦b≦87.0 8.0≦c≦34.0 2.0≦d≦8.0 0≦e≦5.0, and a+b+c+d+e=100.
Claim 10
Independent Claim
169 words
A method for recording information in an optical recording medium having a recording layer comprising directing a light beam to the recording layer to form recorded marks therein, wherein said recording layer is comprised of a recording material containing elements A, B and C wherein 1) A is at least one of silver and gold and containing at least 50 atom % of silver 2), B is at least one of antimony and bismuth and containing at least 50 atom % of antimony 3), and C is at least one of tellurium and selenium and containing at least 50 atom % of tellurium, recording is effected such that the recorded marks are amorphous or microcrystalline while an unrecorded portion of said recording layer remains crystalline, and a differential A concentration given by the A concentration of the unrecorded portion minus the A concentration of the recorded marks is at least 0.5 atom % and up to 5 atom % and the recording layer is 100 to 500 Å thick.
Claim 11
Independent Claim
169 words
A method for recording information in an optical recording medium having a recording layer comprising directing a light beam to the recording layer to form recorded marks therein, wherein said recording layer is comprised of a recording material containing elements A, B and C wherein 1) A is at least one of silver and gold and containing at least 50 atom % of silver 2), B is at least one of antimony and bismuth and containing at least 50 atom % of antimony 3), and C is at least one of tellurium and selenium and containing at least 50 atom % of tellurium, recording is effected such that the recorded marks are amorphous or microcrystalline while an unrecorded portion of said recording layer remains crystalline, and a differential A concentration given by the A concentration of the unrecorded portion minus the A concentration of the recorded marks is at least 0.5 atom % and up to 5 atom % and the recording layer is 100 to 500 Å thick.
Claim 12
Dependent Claim
20 words
The optical recording method of claim 9 wherein the recording material contains 3.0 to 28 atom % of element A.
Claim 13
Dependent Claim
32 words
The optical recording method of claim 9 wherein the medium is operated such that the recording layer may have a linear velocity of 1.0 to 6.0 m/s relative to the light beam.
Claim 14
Dependent Claim
16 words
The optical recording method of claim 1 wherein the unrecorded portion contains an ABC 2 phase.
Claim 15
Dependent Claim
16 words
The optical recording method of claim 12 wherein the unrecorded portion further contains a B phase.
Claim 16
Dependent Claim
22 words
The optical recording method of claims 12, wherein the recording material further contains indium and the unrecorded portion contains an In--C phase.
Claim 17
Dependent Claim
22 words
The optical recording method of claim 9 wherein the recording material further contains indium and the unrecorded portion contains an In--C phase.
Claim 18
Dependent Claim
34 words
The optical recording method of claim 9 wherein the recording material further contains at least one element M selected from the group consisting of Ti, Zr, Hf, V, Nb, Ta, Mn, W, and Mo.
Claim 19
Dependent Claim
57 words
The optical recording method of claim 16, wherein the recording material is represented by the formula: A.sub.a B.sub.b C.sub.c In.sub.d M.sub.e wherein A, B, C and M are as defined above and letters a, b, c, d, and e are representative of an atomic ratio and are in the range: 3.0≦a≦13.0 45.0≦b≦87.0 8.0≦c≦34.0 2.0≦d≦8.0 0≦e≦5.0, and a+b+c+d+e=100.
Claim 20
Dependent Claim
55 words
The optical recording method of claim 9 wherein the recording material is represented by the formula: A.sub.a B.sub.b C.sub.c In.sub.d M.sub.e wherein A, B, C and M are as defined above and letters a, b, c, d, and e representative of an atomic ratio are in the range: 3.0≦a≦13.0, 45.0≦b≦87.0, 8.0≦c≦34.0, 2.0≦d≦8.0, 0≦e≦5.0, and a+b+c+d+e=100.
References Cited (Backward Citations)
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