EP0023809A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Optical recording member
Assignee: Xerox Corp
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Filing: 1980-07-25
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Granted: —
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Expires: 2000-07-25
Abstract
Abstract An optical recording member for optical recording and retrieval of information which comprises a reflective substrate (11) having coated thereon a thin layer (12) of an optical dielectric material and a thin layer (13) of tellurium on the dielectric layer. Marking of the recording member is achieved by the use of a laser controlled in accordance with the information to be recorded. The construction of the tellurium and the dielectric layers is such as to achieve anti-reflecting conditions at the marking wavelength to obtain maximum efficiency. Other layers (16, 17, 19) may be provided in the optical recording member to facilitate the manufacturing process, to provide strength or protection, and for other purposes.
Inventors
- 👤 Anthony T. Ward
- 👤 Thomas W. Smith
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 17:21
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/004; G11B7/0045; G11B7/00451; G11B7/24; G11B7/2403; G11B7/24067; G11B7/241; G11B7/252
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
100 words
An optical recording member for optically recording and retrieving information thereon by means of optical radiation of a marking wavelength and a reading wavelength respectively, including a reflective substrate (11) having coated thereon a layer (12) of an optical dielectric material, and a layer (13) of a recording medium on said dielectric material, characterised in that the recording medium is tellurium, and the thicknesses of the dielectric material and recording medium layers (12, 13) are chosen to obtain anti-reflection conditions at the marking wavelength and to obtain optical contrast between marked and unmarked areas (14, 18) at the reading wavelength.
Claim 2
Dependent Claim
100 words
An optical recording member for optically recording and retrieving information thereon by means of optical radiation of a marking wavelength and a reading wavelength respectively, including a reflective substrate (11) having coated thereon a layer (12) of an optical dielectric material, and a layer (13) of a recording medium on said dielectric material, characterised in that the recording medium is tellurium, and the thicknesses of the dielectric material and recording medium layers (12, 13) are chosen to obtain anti-reflection conditions at the marking wavelength and to obtain optical contrast between marked and unmarked areas (14, 18) at the reading wavelength.
Claim 3
Dependent Claim
35 words
An optical recording member according to claim 1 in which a protective layer (16) is provided on said tellurium layer (13), said protective layer (16) being substantially transparent to the marking and reading optical radiations.
Claim 4
Dependent Claim
63 words
An optical recording member according to claim 2 in which said reflective substrate (11) is made of aluminum, aluminum coated glass, or aluminum coated polymer, in which said protective layer (16) is made of a transparent material at least 0.6 mm thick, and in which said optical dielectric material (12) is silicon dioxide, a transparent metal oxide, or an optically transparent polymeric material.
Claim 5
Dependent Claim
29 words
An optical recording member according to Claim 2 or Claim 3 in which a subbing layer (19) is provided between said tellurium layer (13) and said protective layer (16).
Claim 6
Dependent Claim
83 words
An optical recording member according to claim 4 in which said subbing layer (19) is a thin layer of an optically transparent relatively deformable or relatively low surface energy polymer, such as a polysiloxane, a polyfluoralkoxy phosphazene, a flexible acrylic copolymer, or a poly(perfluoro- acrylate), formed by solution coating technique to present a smooth surface for the deposition of the tellurium layer thereon, and in which said optical dielectric material (12) is an optically transparent relatively rigid polymer such as polymethylmethacrylate or polystyrene.
Claim 7
Dependent Claim
44 words
An optical recording member according to claim 4 in which said subbing layer (19) is made of polydimethyl siloxane, and in which said protective layer (16) is made of polymethylmethacrylate or polystyrene, and in which said optical dielectric material (12) is polymethylmethacrylate or polystyrene.
Claim 8
Dependent Claim
98 words
An optical recording member according to claim 4 in thich said protective layer (16) is a layer of polymethylmethacrylate about 1 mm thick, in which said subbing layer (19) is about 1 micron thick layer 0 of polydimethylsiloxane, in which said tellurium layer (13) is 20 - 150 A thick, in which said dielectric layer (12) is made of polymethylmethacrylate, and in which said reflective substrate (11) is an aluminum layer 1000 - 2000 A thick and coated with a thin layer (17) of a protective polymer material such as polymethylmethacrylate or a polyester on its exposed side.
Claim 9
Dependent Claim
64 words
An optical recording member according to claim 4 in which said subbing layer (19) is a thin layer of a relatively rigid optically transparent polymer formed by solution coating technique to present a smooth surface for the deposition of the tellurium layer (13) thereon, and in which said optical dielectric material (12) is an optically transparent relatively deformable or relatively low surface energy polymer.
Claim 10
Dependent Claim
44 words
An optical recording member according to claim 8 in which said subbing layer (19) is made of polymethylmethaerylate or polystyrene, and in which said optical dielectric material (12) is a polysiloxane, such as polydimethyl siloxane, a polyfluoralkoxy phosphazene, a flexible acrylic copolymer, or polytetrafluoroethylene.
Claim 11
Dependent Claim
99 words
An optical recording member according to claim 8 in which said protective layer (16) is a layer of polymethylmethacrylate about 1 mm thick, in which said subbing layer (19) is a layer of solution coated polymethylmethacrylate about 1 micron thick, in which the tellurium layer (13) 0 is 20 - 150 A thick, in which the optical dielectric material (12) is a thin layer of polydimethyl siloxane, and in which the reflective substrate (11). is an aluminum layer 1000 - 2000 A thick and coated with a thin layer (17) of a protective polymer material on its exposed side.
References Cited (Backward Citations)
US4069487A
Cited
FR2385170A1
Cited
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