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EP0366455A2
Expired / Lapsed
EP
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Optical recording medium and method of its production
Assignee: Mitsui Chemicals Inc
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Filing: 1989-10-26
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Granted: —
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Expires: 2009-10-26
Abstract
Abstract The invention provides an optical recording medium (10) comprising, in order, a substrate (11), a recording layer (12) in the form of a thin film containing Te and N, and optionally Pd, and a protective layer (13) wherein the recording layer (12) in use is imagewise irradiated with a beam of energy to cause a change in the optical properties of the irradiated portions and thereby record information.
Inventors
- 👤 Shigeto Mitsui Petrochemical Ind. Ltd. Shigematsu
- 👤 Koji Mitsui Petrochemical Ind. Ltd. Tsuzukiyama
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 06:33
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/242; G11B7/243; G11B7/2433; G11B7/26; G11B2007/24302; G11B2007/24306; G11B2007/24316; G11B2007/24318; G11B2007/24322; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10S430/00; Y10S430/146; Y10S430/165; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31507
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
65 words
An optical recording medium comprising, in order, a substrate, a recording layer and a protective layer formed on the recording layer, wherein in use the recording layer is imagewise irradiated with a beam of energy to cause a change in the optical properties of the irradiated portions and thereby record information, characterised in that the recording layer is a thin film containing Te and N.
Claim 2
Dependent Claim
65 words
An optical recording medium comprising, in order, a substrate, a recording layer and a protective layer formed on the recording layer, wherein in use the recording layer is imagewise irradiated with a beam of energy to cause a change in the optical properties of the irradiated portions and thereby record information, characterised in that the recording layer is a thin film containing Te and N.
Claim 3
Dependent Claim
33 words
An optical recording medium according to claim 1, wherein the content of N in the recording layer is from 0.1 to 60 atom% based on the total atoms contained in the recording layer.
Claim 4
Dependent Claim
23 words
An optical recording medium according to claim 1 or 2 wherein the recording layer is a thin film containing Te, Pd and N.
Claim 5
Dependent Claim
33 words
An optical recording medium according to claim 3 wherein the content of Pd in the recording layer is from 1 to 80 atom% based on the total atoms contained in the recording layer.
Claim 6
Dependent Claim
58 words
A method of producing an optical recording medium claimed in claim 1 or 2 wherein said recording layer is formed on the substrate by a reactive sputtering in an atmosphere of Ar and N₂ gas using a Te target, the flow rate [N₂/(Ar+N₂)] of N₂ to the total flow of Ar and N₂ being from 5 to 50%.
Claim 7
Dependent Claim
15 words
A method according to claim 5 wherein said rate [N₂/(Ar+N₂)] is from 10 to 30%.
Claim 8
Dependent Claim
62 words
A method of producing an optical recording medium as claimed in claim 3 or 4 wherein said recording layer is formed on the substrate by a reactive sputtering in an atmosphere of Ar and N₂ gas using a target comprising Te and Pd, the flow rate [N₂/(Ar+N₂)] of N₂ to the total flow of Ar and N₂ being from 1 to 80%.
Claim 9
Dependent Claim
15 words
A method according to claim 7 wherein said rate [N₂/(Ar+N₂)] is from 10 to 40%.
References Cited (Backward Citations)
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