EP0288580B1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Method of manufacturing a flexible optical information recording medium
Assignee: Dai Nippon Printing Co Ltd
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Filing: 1987-10-30
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Granted: 1992-07-22
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Expires: 2007-10-30
Abstract
Abstract A flexible optical information recording medium consists of a flexible resin layer (110) having formed on its surface a corrugated pattern (111) corresponding to the information to be recorded and a reflection layer (120) which is formed on the corrugated pattern of the resin layer and has a light reflecting property. Furthermore, a flexible support layer (210) supports the resin layer. To produce such a flexible optical information recording medium, a resin solution (321) which is cured upon radiation of U.V. or electron beam is packed between the U.V. or electron beam-transmissible substrate film (301) as the support layer and a corrugated pattern original (304), and after this resin film is cured and shaped on the substrate film by radiating the U.V. or electron beam (306) through the substrate film, the resulting cured film is peeled off. Another production method comprises forming a resin layer (401b) which is cured by irradiation with U.V. or electron beam and has thermal moldability on a U.V. or electron beam-transmissible substrate film (401a), forming then a roll-shape transfer film (401), bringing the resin layer surface of this transfer film into pressure contact with a corrugated pattern forming surface of the original while heating it, performing the transfer of the corrugated pattern while the resin layer is being softened, radiating then a U.V. or electron beam (406) through the substrate film, curing the softened resin layer and peeling off the transfer film from the original. A flat sheet-like adaptor is used in order to reproduce such a flexible optical information recording medium (200). Reproduction can be made particularly effectively by clamping the medium with a lower surface adaptor (511) and an upper surface adaptor (512). If a total thickness inclusive of the thickness of the adaptors is from 1.2 to 1.5 mm, the medium can be reproduced by commercially available reproducing apparatuses. If an adaptor(s) is bonded to the flexible optical information recording medium, the medium becomes equivalent to conventional thick optical information recording medium. The flexible optical information recording medium is particularly suitable for mass-production.
Inventors
- 👤 Tokio Kodera
- 👤 Nobuaki Kazahaya
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 07:17
CPC Classifications
B; B32; B32B; B32B37/00; B32B37/14; B32B37/24; B29; B29C; B29C35/00; B29C35/02; B29C35/08; B29C39/00; B29C39/14; B29C39/148; B29C43/00; B29C43/22; B29C43/222; B29C59/00; B29C59/02; B29C59/04; B29C59/046; B29D; B29D17/00; B29D17/005; B29D17/007; G; G11; G11B; G11B23/00; G11B23/0014; G11B23/0021; G11B23/0028; G11B23/0035; G11B7/00; G11B7/24; G11B7/241; G11B7/252; G11B7/253; G11B7/26; G11B7/263; B29C35/0805; B29C2035/0827; B29C35/0866; B29C2035/0877; B32B2305/00; B32B2305/72; B32B2429/00; B32B2429/02; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10S430/00; Y10S430/146; Y10T; Y10T428/00; Y10T428/24; Y10T428/24273; Y10T428/24322; Y10T428/24479
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
123 words
A flexible optical information recording medium for recording digital information as an uneven pattern corresponding thereto, comprising: a resin layer (110) having flexibility and having uneven pattern (111) corresponding to information to be recorded formed on the surface thereof, a reflection layer (120) formed on said uneven pattern of said resin layer and light reflectivity, and a supporting layer (210) formed on the opposite surface to the surface on which said reflection layer is formed of said resin layer, having a function to support said resin layer, and having flexibility, characterised in that said resin layer being produced from a resin which is solid at a room temperature, can be hardened by irradiation of ultraviolet rays or electron rays and has thermal moldability.
Claim 2
Dependent Claim
123 words
A flexible optical information recording medium for recording digital information as an uneven pattern corresponding thereto, comprising: a resin layer (110) having flexibility and having uneven pattern (111) corresponding to information to be recorded formed on the surface thereof, a reflection layer (120) formed on said uneven pattern of said resin layer and light reflectivity, and a supporting layer (210) formed on the opposite surface to the surface on which said reflection layer is formed of said resin layer, having a function to support said resin layer, and having flexibility, characterised in that said resin layer being produced from a resin which is solid at a room temperature, can be hardened by irradiation of ultraviolet rays or electron rays and has thermal moldability.
Claim 3
Dependent Claim
35 words
Aflexible optical information recording medium as set forth in claim 1, wherein compound having radical polymerization unsaturated group in a polymer of which glass transition temperature is 0 to 250°C is used as said resin.
Claim 4
Dependent Claim
31 words
Aflexible optical information recording medium as set forth in claim 1, wherein compound having a melting point of 25 to 250°C and radical polymerization unsaturated group is used as said resin.
Claim 5
Dependent Claim
25 words
A flexible optical information recording medium as set forth in claim 1, wherein a metal deposition layer is used as said reflection layer ( 129).
Claim 6
Dependent Claim
22 words
A flexible optical information recording medium as set forth in claim 1, wherein polymerized film is used as said supporting layer (210).
Claim 7
Dependent Claim
36 words
A flexible optical information recording medium as set forth in claim 1, wherein a primer layer for enhancement of adhesiveness is formed along a boundary surface between said supporting layer (210) and said resin layer (110).
Claim 8
Dependent Claim
27 words
A flexible optical information recording medium as set forth in claim 1, which further comprises a protective layer on the upper surface of said reflection layer (129).
Claim 9
Independent Claim
197 words
A method of manufacturing a flexible optical information recording medium, using an original block, on which an uneven pattern corresponding to digital information to be recorded is formed, to transfer and mold uneven pattern of said original block, thereby manufacturing an optical information recording medium, characterised in that said method comprising: a process for forming a resin layer (401 b) of a resin, which is solid at a room temperature, can be hardened by irradiation of ultraviolet rays or electron rays and has thermal moldability on a base film (401 a) through which ultra violet rays or electron rays are transmittable, thus to form a rolled transfer film (401), a process for pressure-welding the resin layer surface of said transfer film onto the surface of said original block (404), on which said uneven pattern is formed, while softening said resin layer by heating it so as to transfer said uneven pattern, a process for irradiating ultraviolet rays or electron rays (406) through said base film, thus to harden the resin layer which once has been softened, and a process for exfoliating said transfer film to which said uneven pattern has been completely transferred from said original block.
Claim 10
Independent Claim
197 words
A method of manufacturing a flexible optical information recording medium, using an original block, on which an uneven pattern corresponding to digital information to be recorded is formed, to transfer and mold uneven pattern of said original block, thereby manufacturing an optical information recording medium, characterised in that said method comprising: a process for forming a resin layer (401 b) of a resin, which is solid at a room temperature, can be hardened by irradiation of ultraviolet rays or electron rays and has thermal moldability on a base film (401 a) through which ultra violet rays or electron rays are transmittable, thus to form a rolled transfer film (401), a process for pressure-welding the resin layer surface of said transfer film onto the surface of said original block (404), on which said uneven pattern is formed, while softening said resin layer by heating it so as to transfer said uneven pattern, a process for irradiating ultraviolet rays or electron rays (406) through said base film, thus to harden the resin layer which once has been softened, and a process for exfoliating said transfer film to which said uneven pattern has been completely transferred from said original block.
Claim 11
Dependent Claim
44 words
Amethod of manufacturing a flexible optical information recording medium as set forth in claim 8, wherein compound having radical polymerization unsaturated group in a polymer of which glass transition temperature is 0 to 260 °C is used as said resin layer (401 b ).
Claim 12
Dependent Claim
40 words
A method of manufacturing a flexible optical information recording medium as set forth in claim 8, wherein compound having a melting point of 25 to 250 °C and radical polymerization unsaturated group is used as said resin layer (401 b).
Claim 13
Dependent Claim
30 words
A method of manufacturing a flexible optical information recording medium as set forth in claim 8, wherein said original block (404) is formed by an exposure process using a photoresist.
Claim 14
Dependent Claim
27 words
A method of manufacturing a flexible optical information recording medium as set forth in claim 8, wherein a mold of resin is used as said original block.
Claim 15
Dependent Claim
27 words
A method of manufacturing a flexible optical information recording medium as set forth in claim 8, wherein a polymerized film is used as said base film (401a).
Claim 16
Dependent Claim
35 words
A method of manufacturing a flexible optical information recording medium as set forth in claim 8, wherein said rolled transfer fim (401) comprises base film (401a), resin layer (401b) and reflection layer (401c) formed thereon.
Claim 17
Independent Claim
274 words
An apparatus for manufacturing a flexible optical information recording medium, in which an original block, on which an uneven pattern corresponding to digital information to be recorded is formed, is used to transfer and mold said uneven pattern of said original block, thereby manufacturing an optical information recording medium, characterised in that said apparatus comprising: a transfer film (401) comprising a base film (401a) through which ultraviolet rays or electron rays are transmittable, and a resin layer (401 b) formed thereon and consisting of a resin, which is solid at a room temperature, can be hardened by irradiation of ultraviolet rays or electron rays and has thermal modability, film supply means (420) for holding said transfer film being wound and supplying said transfer film by winding it off, a replica cylinder (431) on which said original block (404) is fitted so that said uneven pattern is exposed to the outer circumferential surface thereof, and rotationally moving in a predetermined direction, transfer means (430) for pressure-welding said transfer film supplied from said film supply means onto the uneven pattern surface of said original block fitted on said replica cylinder so that the resin layer surface is in contact with said uneven pattern surface, arid transferring said uneven pattern while heating said resin layer to soften it at the same time, irradiation means (450) for irradiating ultraviolet rays or electron rays through said base film to harden the resin layer which once has been softened, exfoliation means (473) for exfoliating said transfer film to which said uneven pattern has been completely transferred from said original block, and winding means (460) for winding said transfer film exfoliated.
Claim 18
Independent Claim
274 words
An apparatus for manufacturing a flexible optical information recording medium, in which an original block, on which an uneven pattern corresponding to digital information to be recorded is formed, is used to transfer and mold said uneven pattern of said original block, thereby manufacturing an optical information recording medium, characterised in that said apparatus comprising: a transfer film (401) comprising a base film (401a) through which ultraviolet rays or electron rays are transmittable, and a resin layer (401 b) formed thereon and consisting of a resin, which is solid at a room temperature, can be hardened by irradiation of ultraviolet rays or electron rays and has thermal modability, film supply means (420) for holding said transfer film being wound and supplying said transfer film by winding it off, a replica cylinder (431) on which said original block (404) is fitted so that said uneven pattern is exposed to the outer circumferential surface thereof, and rotationally moving in a predetermined direction, transfer means (430) for pressure-welding said transfer film supplied from said film supply means onto the uneven pattern surface of said original block fitted on said replica cylinder so that the resin layer surface is in contact with said uneven pattern surface, arid transferring said uneven pattern while heating said resin layer to soften it at the same time, irradiation means (450) for irradiating ultraviolet rays or electron rays through said base film to harden the resin layer which once has been softened, exfoliation means (473) for exfoliating said transfer film to which said uneven pattern has been completely transferred from said original block, and winding means (460) for winding said transfer film exfoliated.
Claim 19
Dependent Claim
38 words
An apparatus for manufacturing a flexible optical information recording medium as set forth in claim 15, wherein said film supply means (420) comprises a rotatable winding roll (421), and a powder brake (424) for controlling the revolution thereof.
Claim 20
Dependent Claim
61 words
An apparatus for manufacturing a flexible optical information recording medium as set forth in claim 16, wherein said transfer means (430) comprises a pressing roller (440) for pressing said transfer film (401) onto said replica cylinder (431), a pressure application mechanism (438) for allowing said pressing roller to effect a pressing operation, and a heating unit for heating said transfer film.
Claim 21
Dependent Claim
26 words
An apparatus for manufacturing a flexible optical information recording medium as set forth in claim 17, wherein said heating unit is incorporated into said pressing roller.
Claim 22
Dependent Claim
27 words
An apparatus for manufacturing a flexible optical information recording medium as set forth in claim 17, wherein said heating unit is incorporated into said replica cylinder (431).
Claim 23
Dependent Claim
44 words
An apparatus for manufacturing a flexible optical information recording medium as set forth in claim 15, wherein said exfoliation means comprises a guide roller (473) for guiding said base film (401) in a direction different from the revolving direction of said replica cylinder (431).
References Cited (Backward Citations)
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