EP0299073A1
Expired / Lapsed
EP
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Optical recording medium and production thereof
Assignee: Dai Nippon Printing Co Ltd
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Filing: 1987-09-25
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Granted: —
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Expires: 2007-09-25
Abstract
Abstract An optical card has an information recording pattern (4) formed as a low reflection portion against a high reflection background (7), which is protected between a transparent substrate 85) and a card substrate (6). The low reflection portion has a coarse surface so that more light is scattered rather than reflected. In production, a photoresist film is deposited on a transparent substrate (5), on which a patterning exposure and then a coarsening exposure are made. After developing this pattern, a thin film of highly reflective material is formed and a card substrate is attached.
Inventors
- 👤 Kazuo Umeda
- 👤 Masaaki Asano
- 👤 Minoru Utsumi
- 👤 Takuya Hamaguchi
- 👤 Takeshi Matsumoto
- 👤 Yuji Kondo
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 11:06
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/2407; G11B7/24085; G11B7/002; G11B7/0033
Claims Analysis
Total Claims: 39
Claim 1
Independent Claim
46 words
An optical recording member, comprising an information recording pattern discriminable by differences in light reflectance formed on a base material, said information recording pattern being constituted of high reflectance portions and low reflectance portions, said low reflectance portions comprising roughened surface portions having light scattering property.
Claim 2
Dependent Claim
46 words
An optical recording member, comprising an information recording pattern discriminable by differences in light reflectance formed on a base material, said information recording pattern being constituted of high reflectance portions and low reflectance portions, said low reflectance portions comprising roughened surface portions having light scattering property.
Claim 3
Dependent Claim
35 words
An optical recording member according to Claim 1, wherein a light reflective material layer is laminated on the entire surface or a part of the base material so as to cover the roughened surface portions.
Claim 4
Dependent Claim
36 words
An optical recording member according to Claim 1, wherein an optical recording material layer is further laminated on the entire surface or a part of the base material so as to cover the roughened surface portions.
Claim 5
Dependent Claim
16 words
An optical recording member according to Claim 1, wherein the low reflectance portions comprise photoresist portions.
Claim 6
Dependent Claim
16 words
An optical recording member according to Claim 1, wherein the low reflectance portions comprise resin portions.
Claim 7
Dependent Claim
21 words
An optical recording member according to Claim 1, wherein the low reflectance portions comprise portions of an ionized radiation curable resin.
Claim 8
Dependent Claim
19 words
An optical recording member according to Claim 1, wherein the low reflectance portions comprise portions of a thermosetting resin.
Claim 9
Dependent Claim
27 words
An optical recording member according to Claim 1, wherein the low reflectance portions are formed of a material which generates gas upon application of an energy thereto.
Claim 10
Dependent Claim
16 words
An optical recording member according to Claim 1, wherein the information recording pattern comprises bit information.
Claim 11
Dependent Claim
26 words
An optical recording member according to Claim 1, wherein the information recording pattern comprises a plural number of sets of optical recording tracks and guide tracks.
Claim 12
Dependent Claim
29 words
An optical recording member according to Claim 1, wherein the information recording pattern comprises bit information and a plural number of sets of optical recording tracks and guide tracks.
Claim 13
Dependent Claim
64 words
An optical recording member according to Claim 2, wherein a card substrate is laminated over an adhesive layer on the surface of the optical recording member on the side of said light reflective material layer, while a transparent protective layer is laminated on the surface of the optical recording member on the side opposite to that where said light reflective material layer is provided.
Claim 14
Dependent Claim
64 words
An optical recording member according to Claim 3, wherein a card substrate is laminated over an adhesive layer on the surface of the optical recording member on the side of said light reflective material layer, while a transparent protective layer is laminated on the surface of the optical recording member on the side opposite to that where said light reflective material layer is provided.
Claim 15
Dependent Claim
38 words
An optical recording member according to Claim 1, wherein the substrate comprises a glass, said low reflectance portions comprise the roughened surface portion of said glass substrate surface, and the high reflectance portions comprise portions of photoresist layer.
Claim 16
Independent Claim
50 words
A method for preparing an optical recording member, which, in preparing an optical recording member having an information recording pattern constituted of high reflectance portions and low reflectance portions on a substrate, comprises forming said low reflectance portions according to a surface roughening treatment corresponding to the information recording pattern.
Claim 17
Independent Claim
50 words
A method for preparing an optical recording member, which, in preparing an optical recording member having an information recording pattern constituted of high reflectance portions and low reflectance portions on a substrate, comprises forming said low reflectance portions according to a surface roughening treatment corresponding to the information recording pattern.
Claim 18
Dependent Claim
20 words
A method according to Claim 15, wherein said surface roughening treatment is conducted according to a photographic plate making method.
Claim 19
Dependent Claim
129 words
A method according to Claim 15, wherein the process for forming the low reflectance portions subjected to surface roughening corresponding to the information recording pattern comprises the following steps: (a) the step of forming a photoresist layer on the substrates; (b) the step of effecting the first exposure on the above photoresist layer through a mask corresponding to the information recording pattern (patterning exposure); (c) the step of subsequently effecting the second exposure on the photoresist layer subjected to the above first exposure through a transparent member having a fine light and dark pattern formed thereon (surface roughening exposure); and (d) the step of performing development on the photoresist layer subjected to the above second exposure, thereby obtaining an information recording pattern comprising low reflectance portions with roughened surface.
Claim 20
Dependent Claim
34 words
A method according to Claim 17, wherein the transparent member having the fine light and dark pattern used in said step (c) is a transparent member having fine unevenness formed on the surface thereof.
Claim 21
Dependent Claim
113 words
A method according to Claim 15, wherein the process of forming the low reflectance portions subjected to surface roughening corresponding to the information recording pattern comprises the following steps: (a) the step of forming a photoresist layer on a substrate having fine unevenness formed on the surface; (b) the step of effecting patterning exposure on the above photoresist layer through a mask corresponding to an information recording pattern; and (c) the step of performing development on the photoresist layer subjected to the said patterning exposure to cause exposure of the surface of the substrate having fine unevenness in accordance with the information recording pattern, thereby obtaining an information recording pattern with roughened surface.
Claim 22
Dependent Claim
144 words
A method according to Claim 17 or 19, wherein the process of forming the low reflectance portions with roughened surface corresponding to the information recording pattern comprises the following steps: (a) the step of using the optical recording member comprising the information recording pattern comprising the low reflectance portion with roughened surface formed thereon obtained in said step (c) as the original plate for surface roughening; (b) the step of templating with the substrate superposed on the information recording pattern side of said surface roughened original plate over an uncured resin layer under pressure or under no pressure, thereby transferring the pattern-shaped roughened surface of the original plate to the above resin layer; and (c) the step of curing the resin layer subjected to templating in the above step (b), thereby obtaining an information recording pattern comprising the low reflectance portions with roughened surface.
Claim 23
Dependent Claim
121 words
A method according to Claim 15, wherein the process of forming the low reflectance portions subjected to surface roughening corresponding to the information recording pattern comprises the following steps: (a) the step of forming a material layer which generates gas upon application of an energy on a substrate; (b) the step of effecting patterning exposure on the above material layer through a mask corresponding to an information recording pattern; (c) the step of further applying an energy on the material layer to generate gas in said material layer, thereby obtaining a light scattering material layer; and (d) the step of performing development of the above material layer, thereby obtaining an information recording pattern comprising the low reflectance portions with roughened surface.
Claim 24
Dependent Claim
142 words
A method according to Claim 21, wherein the process forming the low reflectance portions subjected to surface roughening corresponding to the information recording pattern comprises the following steps: (a) the step of using the optical recording member comprising an information recording pattern comprising the low reflectance portion with roughened surface formed thereon obtained in said step (d) as the original plate for surface roughening; (b) the step of templating with the substrate superposed on the information recording pattern side of said surface roughened original plate over an uncured resin layer under pressure or under no pressure, thereby transferring the pattern-shaped roughened surface of the original plate to the above resin layer; and (c) the step of curing the resin layer subjected to templating in the above step (b), thereby obtaining an information recording pattern comprising the low reflectance portions with roughened surface.
Claim 25
Dependent Claim
89 words
A method according to Claim 15, wherein the process of forming the low reflectance portions subjected to surface roughening corresponding to the information recording pattern comprises the following steps: (a) the step of forming a photoresist layer on a substrate; (b) the step of effecting pattern exposure on the above photoresist layer through a mask corresponding to an information recording pattern; and (c) the step of subsequently performing development on the photoresist layer, and further etching to obtain an information recording pattern comprising low reflectance portions with roughened surface.
Claim 26
Dependent Claim
143 words
A method according to Claim 23, wherein the process of forming the low reflectance portions subjected to surface roughening corresponding to the information recording pattern comprises the following steps: (a) the step of using the optical recording member comprising an information recording pattern comprising the low reflectance portions with roughened surface formed therein obtained in said step (b) as the original plate for surface roughening; (b) the step of templating with the substrate superposed on the information recording pattern side of said surface roughened original plate over an uncured resin layer under pressure or under no pressure, thereby transferring the pattern-shaped roughened surface of the original plate to the above resin layer; and (c) the step of curing the resin layer subjected to templating in the above step (b), thereby obtaining an information recording pattern comprising the low reflectance portions with roughened surface.
Claim 27
Independent Claim
72 words
A method according to any one of Claims 20, 22 or 24, wherein the optical recording member comprising an information recording pattern comprising the low reflectance portions with roughened surface formed thereon finally obtained is made the original plate for surface roughening (mother mask), and further an optical recording medium is obtained by templating with the use of the mother mask as the duplicating original plate for a large number of copies.
Claim 28
Independent Claim
52 words
A method according to any one of Claims 17 to 25, which includes the step of laminating a light reflective material layer or an optical recording material layer on the entire surface or a part of the substrate so as to cover the low reflectance portions of the optical recording member obtained.
Claim 29
Dependent Claim
158 words
A method according to Claim 15, wherein the processes of forming the low reflectance portions subjected to surface roughening corresponding to an information pattern comprises the following steps: (a) the step of forming a mask pattern corresponding to the information recording pattern on a transparent material; (b) the step of roughening the surface of the above transparent material at the portion where no mask pattern is formed by etching; (c) the step of forming a photoresist layer on a base material; (d) the step of effecting surface roughening exposure on the photoresist layer on the base material obtained in said step (c) by the use of the product obtained in said step (b) as the mask for surface roughening exposure, through said mask for surface roughening exposure; and (e) the step of performing development on the photoresist layer subjected to said surface roughening exposure, thereby obtaining an information recording pattern comprising the low reflectance portions with roughened surface.
Claim 30
Dependent Claim
96 words
A method according to Claim 15, wherein the process of forming the low reflectance portions subjected to surface roughening corresponding to an information pattern comprises the following steps: (a) the step of forming a mask pattern corresponding to the information recording pattern on a transparent material; (b) the step of roughening the surface of said transparent material at the portion where no mask pattern is formed; and (c) the step of removing the mask pattern formed on the surface of the transparent material, thereby obtaining an information pattern comprising the low reflectance portions with roughened surface.
Claim 31
Dependent Claim
23 words
A method according to Claim 27 or 28, wherein the etchant used in the etching step of said step (b) contains fine particles.
Claim 32
Dependent Claim
145 words
30'. A method according to Claim 27, wherein the process of forming the low reflectance portions subjected to surface roughening corresponding to an information recording pattern comprises the following steps: (a) the step of using the optical recording member comprising an information recording pattern comprising the low reflectance portions with roughened surface formed thereon obtained in said step (b) as the original plate for surface roughening; (b) the step of templating with the base material superposed on the information recording pattern side of said surface roughened original plate through an uncured resin layer under pressure or under no pressure, thereby transferring the pattern-shaped roughened surface of the original plate to the above resin layer; and (c) the step of curing the resin layer subjected to templating in the above step (b), thereby obtaining an information recording pattern comprising the low reflectance portions with roughened surface.
Claim 33
Dependent Claim
66 words
A method according to Claim 30, wherein the optical recording member comprising an information recording pattern comprising the low reflectance portions with roughened surface formed thereon finally obtained is made the original plate for surface roughening (mother mask), and further an optical recording medium is obtained by templating with the use of the mother mask as the duplicating original plate for a large number of copies.
Claim 34
Independent Claim
52 words
A method according to any one of Claims 27 to 31, which includes the step of laminating a light reflective material layer or an optical recording material layer on the entire surface or a part of the substrate so as to cover the low reflectance portions of the optical recording member obtained.
Claim 35
Dependent Claim
166 words
A method according to Claim 15, wherein the process of forming the low reflectance portions subjected to surface roughening corresponding to an information pattern is performed according to the following steps: (a) the step of forming a mask pattern corresponding to an information recording pattern on a light-transmissive substrate; (b) the step of forming a photoresist layer on the surface of the above light-transmissive substrate so as to cover said mask pattern; (c) the step of effecting the first exposure from the surface on the opposite side to the photoresist layer of the above light-transmissive substrate (patterning exposure); (d) the step of subsequently effecting the second exposure on the above photoresist layer subjected to the first exposure from said photoresist layer side through a transparent material having a fine light and dark pattern formed thereon; and (e) the step of performing development on the photoresist layer subjected to the above second exposure, thereby obtaining an information recording pattern comprising the low reflectance portions with roughened surface.
Claim 36
Dependent Claim
143 words
A method according to Claim 33, wherein the process of forming the low reflectance portions subjected to surface roughening corresponding to an information recording pattern comprises the following steps: (a) the step of using the optical recording member comprising an information recording pattern comprising the low reflectance portions with roughened surface formed thereon obtained in said step (e) as the original plate for surface roughening; (b) the step of templating with the substrate superposed on the information recording pattern side of said surface roughened original plate over an uncured resin layer under pressure or under no pressure, thereby transferring the pattern-shaped roughened surface of the original plate to the above resin layer; and (c) the step of curing the resin layer subjected to templating in the above step (b), thereby obtaining an information recording pattern comprising the low reflectance portions with roughened surface.
Claim 37
Dependent Claim
66 words
A method according to Claim 34, wherein the optical recording member comprising an information recording pattern comprising the low reflectance portions with roughened surface formed thereon finally obtained is made the original plate for surface roughening (mother mask), and further an optical recording medium is obtained by templating with the use of the mother mask as the duplicating original plate for a large number of copies.
Claim 38
Independent Claim
52 words
A method according to any one of Claims 33 to 35, which includes the step of laminating a light reflective material layer or an optical recording material layer on the entire surface or a part of the substrate so as to cover the low reflectance portions of the optical recording member obtained.
Claim 39
Dependent Claim
199 words
A method according to Claim 15, wherein the process of forming the low reflectance portions subjected to surface roughening corresponding to an information pattern is performed according to the following steps: (a) the step of forming a metal mask layer on a light-transmissive substrate; (b) the step of forming a photoresist layer on the surface of the above metal mask layer; (c) the step of effecting the first exposure through thephotomask from the side of the above photoresist layer (patterning exposure); (d) the step of forming a photoresist layer corresponding to an information recording pattern by effecting development on the photoresist layer subjected to the above first exposure; (e) the step of forming a laminated product of the photoresist layer and the metal mask layer corresponding to the information recording pattern by etching further the metal mask layer; (f) the step of effecting the second exposure on the above photoresist layer through a transparent material having a fine light and dark pattern formed thereon (surface roughening exposure); and (g) the step of performing further development on the photoresist layer subjected to the above second exposure, thereby obtaining an information recording pattern comprising the low reflectance portions with roughened surface.
References Cited (Backward Citations)
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