US4735888A
Expired / Lapsed
US
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Information recording medium and manufacturing method thereof
Assignee: Toshiba Corp
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Filing: 1986-01-30
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Granted: 1988-04-05
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Expires: 2006-01-30
Abstract
Abstract A disk-shaped recording medium of the invention has a photosensitive recording layer formed on a substrate. Tellurium oxide clusters are dispersed in a hydrocarbon matrix of the recording layer so as to thermally stabilize the matrix. Tellurium clusters are dispersed in the matrix which is thermally stabilized by dispersion of the tellurium oxide clusters. The recording layer has excellent oxidation and heat resistance. The recording medium is manufactured by a plasma sputtering technique.
Inventors
- 👤 Yoshikatsu Takeoka
- 👤 Norio Ozawa
- 👤 Nobuaki Yasuda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:59
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/242; G11B7/251; Y; Y10; Y10S; Y10S430/00; Y10S430/146; Y10S430/165
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
92 words
A recording medium, comprising: (a) a substrate; and (b) a photosensitive recording layer formed on said substrate, said recording layer comprising, a hydrocarbon matrix, low-melting-point metal clusters dispersed in said matrix, the low-melting-point metal of said clusters selected from the group consisting of tellurium, indium, bismuth, lead, arsenic, and selenium, and metal oxide clusters dispersed in said matrix for thermally stabilizing said matrix and for improving the heat resistance of said recording layer, the metal of said oxide clusters selected from the group consisting of tellurium, indium, bismuth, lead, arsenic, and selenium.
Claim 2
Dependent Claim
92 words
A recording medium, comprising: (a) a substrate; and (b) a photosensitive recording layer formed on said substrate, said recording layer comprising, a hydrocarbon matrix, low-melting-point metal clusters dispersed in said matrix, the low-melting-point metal of said clusters selected from the group consisting of tellurium, indium, bismuth, lead, arsenic, and selenium, and metal oxide clusters dispersed in said matrix for thermally stabilizing said matrix and for improving the heat resistance of said recording layer, the metal of said oxide clusters selected from the group consisting of tellurium, indium, bismuth, lead, arsenic, and selenium.
Claim 3
Dependent Claim
23 words
The recording medium according to claim 1, wherein said metal oxide clusters comprise an oxide of a metal constituting said low-melting-point metal clusters.
Claim 4
Dependent Claim
25 words
The recording medium according to claim 2, wherein said metal oxide clusters comprise tellurium oxide clusters and said low-melting-point metal clusters comprise tellurium metal clusters.
Claim 5
Dependent Claim
31 words
The recording medium according to claim 3, wherein the number of tellurium atoms contained in said recording layer is set to exceed the number of carbon atoms contained in said matrix.
Claim 6
Dependent Claim
36 words
The recording medium according to claim 4, wherein a ratio of the number of tellurium atoms to the number of carbon atoms in said recording layer is set to be not less than 2 to 1.
Claim 7
Dependent Claim
30 words
The recording medium according to claim 4, wherein a ratio of the number of tellurium atoms to the number of carbon atoms in said recording layer is 2-6 to 1.
Claim 8
Dependent Claim
33 words
The recording medium according to claim 4, wherein molar ratio of the tellurium oxide clusters to the tellurium clusters in said recording layer is set to be not less than 0.1 to 1.
Claim 9
Dependent Claim
27 words
The recording medium according to claim 4, wherein molar ratio of the tellurium oxide clusters to the tellurium clusters in said recording layer is 0.1-1.2 to 1.
Claim 10
Dependent Claim
74 words
A recording medium comprising: (a) a substrate; and (b) a photosensitive recording layer formed on said substrate, said recording layer comprising; a hydrocarbon matrix, tellurium metal clusters dispersed in said matrix, and metal oxide clusters dispersed in said matrix for thermally stabilizing said matrix and for improving the heat resistance of said recording layer, the metal of said oxide clusters being selected from the group consisting of tellurium, indium, bismuth, lead, arsenic, and selenium.
Claim 11
Dependent Claim
74 words
A recording medium comprising: (a) a substrate; and (b) a photosensitive recording layer formed on said substrate, said recording layer comprising; a hydrocarbon matrix, tellurium metal clusters dispersed in said matrix, and metal oxide clusters dispersed in said matrix for thermally stabilizing said matrix and for improving the heat resistance of said recording layer, the metal of said oxide clusters being selected from the group consisting of tellurium, indium, bismuth, lead, arsenic, and selenium.
Claim 12
Dependent Claim
29 words
The recording medium according to claim 9, wherein the number of tellurium atoms in said recording layer is set to exceed the number of carbon atoms in said matrix.
Claim 13
Dependent Claim
29 words
The recording medium according to claim 10, wherein the ratio of the number of carbon atoms in said recording layer is set at not less than 2 to 1.
Claim 14
Dependent Claim
24 words
The recording medium according to claim 10, wherein the ratio of the number of carbon atoms in said recording layer is 2-6 to 1.
Claim 15
Dependent Claim
33 words
The recording medium according to claim 10, wherein the molar ratio of the tellurium oxide clusters to the tellurium clusters in said recording layer is set at not less than 0.1 to 1.
Claim 16
Dependent Claim
28 words
The recording medium according to claim 10, wherein the molar ratio of the tellurium oxide clusters to the tellurium clusters in said recording layer is 0.1-1.2 to 1.
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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) | 1991-04-05 | 1991-10-05 | 1992-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-05 | 1995-10-05 | 1996-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-05 | 1999-10-05 | 2000-04-05 | $7700.00 | Window Closed / Lapsed |