US5314734A
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Information-recording medium
Assignee: Hitachi Ltd
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Filing: 1993-02-10
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Granted: 1994-05-24
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Expires: 2013-02-10
Abstract
Abstract An information recording medium which is superior in record/read-out characteristics, high in sensitivity and good in stability can be provided at a low cost by using, as an information-recording medium in which recording is carried out due to change in atomic arrangement upon irradiation with a laser beam, an information-recording medium comprising substrates 1, 1' , recording layers 2, 2' changing in atomic arrangement upon irradiation with a recording energy beam, and reflective layers which are provided contiguous to the recording layers and the recording layer has an average composition represented by AwDxSbySez (wherein w, x, y and z are in the ranges of 0</=w</=30, 3</=x</=57, 3</=y</=57 and 40</=z</=90 in atomic percent, D represents at least one element of Sn, In, Ge, Pb, Si, Bi, Ga, Au, Ag and Cu and A represents an element other than Sb, Se, the elements represented by D and rare gases).
Inventors
- 👤 Tetsuya Nishida
- 👤 Shinkichi Horigome
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:43
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/06; C23C14/0623; G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/242; G11B7/243; G11B2007/24302; G11B2007/24308; G11B2007/2431; G11B2007/24312; G11B2007/24314; G11B2007/24316; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10S430/00; Y10S430/146
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
158 words
An information-recording medium comprising a substrate, a recording layer provided on the substrate, said recording layer changing in atomic arrangement upon irradiation with a recording energy beam, and a reflective layer which is provided on the side of the recording layer reverse to the side irradiated with the recording energy beam, wherein said recording layer and said reflective layer are contiguous to each other and the recording layer has an average composition represented by the following formula: A.sub.w D.sub.x Sb.sub.y Se.sub.z wherein w, x, y and z are in the range of 0≦w≦30, 3≦x≦57, 3≦y≦57 and 40≦z≦90 in atomic percent, D represents at least one element of Sn, In, Ge, Pb, Si, Bi, Ga and Au, and A represents at least one element other than Sb, Se and the elements represented by D; and wherein said recording layer has a thickness of 5 to 500 nm and said reflective layer has a thickness of 10 to 500 nm.
Claim 2
Dependent Claim
158 words
An information-recording medium comprising a substrate, a recording layer provided on the substrate, said recording layer changing in atomic arrangement upon irradiation with a recording energy beam, and a reflective layer which is provided on the side of the recording layer reverse to the side irradiated with the recording energy beam, wherein said recording layer and said reflective layer are contiguous to each other and the recording layer has an average composition represented by the following formula: A.sub.w D.sub.x Sb.sub.y Se.sub.z wherein w, x, y and z are in the range of 0≦w≦30, 3≦x≦57, 3≦y≦57 and 40≦z≦90 in atomic percent, D represents at least one element of Sn, In, Ge, Pb, Si, Bi, Ga and Au, and A represents at least one element other than Sb, Se and the elements represented by D; and wherein said recording layer has a thickness of 5 to 500 nm and said reflective layer has a thickness of 10 to 500 nm.
Claim 3
Dependent Claim
14 words
An information-recording medium according to claim 1, wherein D in the formula is Sn.
Claim 4
Dependent Claim
14 words
An information-recording medium according to claim 1, wherein D in the formula is In.
Claim 5
Dependent Claim
41 words
An information-recording medium according to claim 1, wherein the at least one element represented by A comprises at least one element other than Ge, Tl and rare earth elements and the total amount of A is 20 atomic % or less.
Claim 6
Dependent Claim
31 words
An information-recording medium according to claim 1, wherein the at least one element represented by A comprises at least Tl and the amount of Tl is 15 atomic % or less.
Claim 7
Dependent Claim
14 words
An information-recording medium according to claim 1, wherein A in the formula represents Te.
Claim 8
Dependent Claim
41 words
An information-recording medium according to claim 1, wherein the at least one element represented by A is at least one transition metal element other than the elements of Group Ib and total amount of A is 20 atm % or less.
Claim 9
Dependent Claim
23 words
An information-recording medium according to claim 1, wherein the at least one element represented by A is at least one rare earth element.
Claim 10
Dependent Claim
16 words
An information-recording medium according to claim 1, wherein light absorbance of the reflective layer is 20-70%.
Claim 11
Dependent Claim
21 words
An information-recording medium according to claim 1, wherein thermal conductivity of the reflective layer is 0.3 W/(cm.deg) or less at 273K.
Claim 12
Dependent Claim
62 words
An information-recording medium according to claim 1, wherein the reflective layer comprises a thin film having an average composition represented by the following formula: E.sub.h Sb.sub.i Bi.sub.j wherein h, i and j are in the range of 0≦h≦30, 35≦i≦95 and 5≦j≦65 in atomic % and E represents at least one element of metals, semi-metals or semiconductor elements other than Sb and Bi.
Claim 13
Dependent Claim
14 words
An information-recording medium according to claim 11, wherein E in the formula represents Sn.
Claim 14
Dependent Claim
14 words
An information-recording medium according to claim 11, wherein E in the formula represents Te.
Claim 15
Dependent Claim
14 words
An information-recording medium according to claim 11, wherein E in the formula represents Ge.
Claim 16
Dependent Claim
19 words
An information-recording medium according to claim 11, wherein E in the formula represents at least one transition metal element.
Claim 17
Dependent Claim
187 words
An information-recording medium comprising a substrate, a recording layer provided on the substrate, said recording layer changing in atomic arrangement upon irradiation with a recording energy beam, and a reflective layer which is provided on the side of the recording layer reverse to the side irradiated with the recording energy beam, wherein said recording layer and said reflective layer are contiguous to each other and diffusion of atoms from the recording layer to the reflective layer and/or from the reflective layer to the recording layer occurs upon irradiation with a recording energy beam, wherein said recording layer has an average composition represented by the following formula: A.sub.w D.sub.x Sb.sub.y Se.sub.z wherein w, x, y and z are in the range of 0≦w≦30, 3≦x≦57, 3≦y≦57 and 40≦z≦90 in atomic percent, D represents at least one element of Sn, In, Ge, Pb, Si, Bi, Ga and Au, and A represents at least one element other than Sb, Se and the elements represented by D; and wherein said recording layer has a thickness of 5 to 500 nm and said reflective layer has a thickness of 10 to 500 nm.
Claim 18
Dependent Claim
187 words
An information-recording medium comprising a substrate, a recording layer provided on the substrate, said recording layer changing in atomic arrangement upon irradiation with a recording energy beam, and a reflective layer which is provided on the side of the recording layer reverse to the side irradiated with the recording energy beam, wherein said recording layer and said reflective layer are contiguous to each other and diffusion of atoms from the recording layer to the reflective layer and/or from the reflective layer to the recording layer occurs upon irradiation with a recording energy beam, wherein said recording layer has an average composition represented by the following formula: A.sub.w D.sub.x Sb.sub.y Se.sub.z wherein w, x, y and z are in the range of 0≦w≦30, 3≦x≦57, 3≦y≦57 and 40≦z≦90 in atomic percent, D represents at least one element of Sn, In, Ge, Pb, Si, Bi, Ga and Au, and A represents at least one element other than Sb, Se and the elements represented by D; and wherein said recording layer has a thickness of 5 to 500 nm and said reflective layer has a thickness of 10 to 500 nm.
Claim 19
Dependent Claim
37 words
An information-recording medium according to claim 16, wherein the element represented by A comprises at least one element other than Te, Tl and rare earth elements and total amount of A is 20 atomic % or less.
Claim 20
Dependent Claim
28 words
An information-recording medium according to claim 16, wherein the element represented by A comprises at least Tl and the amount of Tl is 15 atomic % or less.
Claim 21
Dependent Claim
16 words
An information-recording medium according to claim 16, wherein light absorbance of the reflective layer is 20-70%.
Claim 22
Dependent Claim
21 words
An information-recording medium according to claim 16, wherein thermal conductivity of the reflective layer is 0.3 W/(cm.deg) or less at 273K.
Claim 23
Dependent Claim
62 words
An information-recording medium according to claim 16, wherein the reflective layer comprises a thin film having an average composition represented by the following formula: E.sub.h Sb.sub.i Bi.sub.j wherein h, i and j are in the range of 0≦h≦30, 35≦i≦95 and 5≦j≦65 in atomic % and E represents at least one element of metals, semi-metals or semiconductor elements other than Sb and Bi.
Claim 24
Dependent Claim
14 words
An information-recording medium according to claim 22, wherein E in the formula represents Sn.
Claim 25
Dependent Claim
14 words
An information-recording medium according to claim 22, wherein E in the formula represents Te.
Claim 26
Dependent Claim
14 words
An information-recording medium according to claim 22, wherein E in the formula represents Ge.
Claim 27
Dependent Claim
19 words
An information-recording medium according to claim 23, wherein E in the formula represents at least one transition metal element.
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