EP0226945A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Coated media for optical recording, with "soft/hard" overcoat
Assignee: Unisys Corp
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Filing: 1983-11-29
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Granted: —
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Expires: 2003-11-29
Abstract
Abstract An optical data storage system is contemplated, one employing a data-modulated writing laser beam and a non-erasing reading laser beam of predetermined wavelength. Improved optical media for such systems are described, these characterized by multiple layers whose optical characteristics and thickness are chosen to accommodate a prescribed writing and reading energy and wavelength and so provide an "anti-reflection" condition for unrecorded portions of the medium and a relatively higher reflectivity for recorded portions. A preferred optical medium includes a highly reflective aluminum layer, a relatively transparent polymer spacer layer overlying the reflective layer, and an optical absorber (recording) layer overlying the spacer layer. Overcoating structure is specified in some detail; e.g., as a "soft pad" layer (e.g., fluoropolymer) on the absorber, with a "Hard" layer (e.g., radiation-cured acrylic) laid over the "soft pad" as an outer protective overcoat. Also, the "spacer" may be rendered as such a "soft pad".
Inventors
- 👤 Thomas Mayer
- 👤 Normal L. Boling
- 👤 James D. Rancourt
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 20:52
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/252; G11B7/254; G11B7/2542; G11B7/242; G11B7/243; G11B2007/24302; G11B2007/24306; G11B7/258; G11B7/2585
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
107 words
A radiation-recording element comprising a support (A), a radiation-sensitive recording layer (e), a layer (f) of a first polymeric material transparent to said radiation and having one surface contiguous to one surface of said recording layer (e) and its opposite surface contiguous to a surface of a layer (g) of a second polymeric material which is also transparent to said radiation, but is harder than said first material, characterised in that during the recording process said recording layer (e) is deformed in response to said radiation and in that said layer (f) of said first material is such that it offers substantially no resistance to said deformation.
Claim 2
Dependent Claim
107 words
A radiation-recording element comprising a support (A), a radiation-sensitive recording layer (e), a layer (f) of a first polymeric material transparent to said radiation and having one surface contiguous to one surface of said recording layer (e) and its opposite surface contiguous to a surface of a layer (g) of a second polymeric material which is also transparent to said radiation, but is harder than said first material, characterised in that during the recording process said recording layer (e) is deformed in response to said radiation and in that said layer (f) of said first material is such that it offers substantially no resistance to said deformation.
Claim 3
Dependent Claim
35 words
A radiation-recording element according to Claim 1, characterised in that said layer (f) of said first material provides thermal and mechanical isolation between said recording layer (e) and said layer (g) of said second material.
Claim 4
Dependent Claim
39 words
A radiation-recording element according to Claim 1 or Claim 2, characterised in that said layer (f) of said first material adheres more strongly to said layer (g) of said second material than it does to said recording layer (e).
Claim 5
Dependent Claim
25 words
A radiation-recording element according to any of the preceding Claims, characterised in that said first material consists of the condensation product of a vacuum-evaporated fluoro-polymer.
Claim 6
Dependent Claim
29 words
A radiation-recording element according to any of the preceding Claims, characterised in that a radiation reflecting film (c) is located between said recording layer (e) and said support (A).
Claim 7
Dependent Claim
25 words
A radiation-recording element according to Claim 5, characterised in that a spacer layer (d) is located between said film (c) and said recording layer (e).
Claim 8
Dependent Claim
19 words
A radiation-recording element according to Claim 5 or Claim 6, characterised in that said film (c) consists of aluminium.
Claim 9
Independent Claim
96 words
A method of manufacturing a radiation-recording element, wherein a radiation-sensitive recording layer (e) is deposited on a support (A), wherein a layer (f) of a first polymeric material is deposited on said recording layer (e) and wherein a layer (g) of a second polymeric material, which is harder than said first material, is deposited on said layer (f) of said first material, characterised in that said first material is such, and said layer of said first material is so deposited, that it offers substantially no resistance to deformation of said recording layer during the recording process.
Claim 10
Independent Claim
96 words
A method of manufacturing a radiation-recording element, wherein a radiation-sensitive recording layer (e) is deposited on a support (A), wherein a layer (f) of a first polymeric material is deposited on said recording layer (e) and wherein a layer (g) of a second polymeric material, which is harder than said first material, is deposited on said layer (f) of said first material, characterised in that said first material is such, and said layer of said first material is so deposited, that it offers substantially no resistance to deformation of said recording layer during the recording process.
Claim 11
Dependent Claim
44 words
A method according to Claim 8, characterised in that an aluminium reflective film (c) is deposited on said support (A), in that a spacer layer (d) is deposited on said film (c), and said recording layer (e) is deposited on said spacer layer (d).
Claim 12
Dependent Claim
15 words
A method according to Claim 9, characterized in that said spacer layer consists of fluoroethylene-propylene.
Claim 13
Dependent Claim
42 words
A method according to Claim 9 or Claim 10, characterised in that said reflective film (c), said spacer layer (d) and said recording layer (e) are all deposited in a single continuous sequence and with a single common apparatus by vacuum evaporation.
Claim 14
Independent Claim
31 words
A method according to any of Claims 9 to 11, characterised in that said spacer layer (d) bonds more strongly to said reflective film (c) than to said recording layer (e).
Claim 15
Independent Claim
26 words
A method according to any of Claims 9 to 12, characterised in that the material of said spacer layer is the same as said first material.
Claim 16
Dependent Claim
23 words
A method according to Claim 11, characterised in that said layer of said first material is also deposited in said single continuous sequence.
References Cited (Backward Citations)
No citation records indexed.
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