EP0374256A1
Expired / Lapsed
EP
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Optical recording medium and method of manufacturing same
Assignee: Dai Nippon Printing Co Ltd
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Filing: 1989-04-12
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Granted: —
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Expires: 2009-04-12
Abstract
Abstract An optical recording medium according to the present invention consists of a substrate, and information recording patterns (2, 3) formed on the substrate and capable of being discriminated from each other by their different reflectances, characterized in that the information recording pattern (2) is composed of a high reflectance portion (2a) and a low reflectance portion (2b) with at least part of the information recording patterns made up of a diffraction grating or a hologram (3). Since such a plurality of elements of information can be recorded at a high density at once, the present invention enables the manufacturing steps to be simplified, and has an excellent forgery preventing effect.
Inventors
- 👤 Kazuo Dai Nippon Insatsu Kabushiki Kaisha UMEDA
- 👤 Yuji Dai Nippon Insatsu Kabushiki Kaisha KONDO
- 👤 Toshiharu Dai Nippon Insatsu K.K. ISHIKAWA
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 15:02
CPC Classifications
G; G03; G03H; G03H1/00; G03H1/22; B; B42; B42D; B42D25/00; B42D25/30; B42D25/328; G07; G07F; G07F7/00; G07F7/08; G07F7/086; G11; G11B; G11B7/00; G11B7/002; G11B7/0033; G11B7/004; G11B7/0065; G11B7/24; G11B7/26; G03H1/0005; G03H1/0011; G03H1/02; G03H1/0236; G03H1/024; G03H1/0244; G03H2001/0016; G03H1/04; G03H1/18; G03H2001/187; G03H2230/00; G03H2230/10; G03H2270/00; G03H2270/52; G03H2270/54
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
55 words
An optical recording medium having on a substrate an information recording pattern distinguishable by a difference in light reflectivity, said information recording pattern being comprised of a portion of high reflectivity and a portion of low reflectivity and at least a part of said information recording pattern being comprised of a diffraction grating or hologram.
Claim 2
Dependent Claim
55 words
An optical recording medium having on a substrate an information recording pattern distinguishable by a difference in light reflectivity, said information recording pattern being comprised of a portion of high reflectivity and a portion of low reflectivity and at least a part of said information recording pattern being comprised of a diffraction grating or hologram.
Claim 3
Dependent Claim
28 words
An optical recording medium as claimed in Claim 1, wherein the portion of low reflectivity of said' information recording pattern is comprised of a diffraction grating or hologram.
Claim 4
Dependent Claim
37 words
An optical recording medium as claimed in Claim 1, wherein said information recording pattern includes a diffraction grating, and is formed such that the width of a pitch of a part of said diffraction grating is varied.
Claim 5
Dependent Claim
34 words
An optical recording medium as claimed in Claim 1, wherein said information recording pattern includes a diffraction pattern, and is formed such that a part of the angle of said diffraction grating is varied.
Claim 6
Dependent Claim
34 words
An optical recording medium as claimed in Claim 1, wherein said information recording pattern includes a diffraction grating, and is formed by overlapping baking of a part of said diffraction grating having varied angles.
Claim 7
Dependent Claim
14 words
An optical recording medium as claimed in Claim 1, which is an optical card.
Claim 8
Dependent Claim
14 words
An optical recording medium as claimed in Claim 1, which is an optical disk.
Claim 9
Dependent Claim
35 words
An optical recording medium as claimed in Claim 1, wherein a light reflecting material is laminated on the whole surface or a partial surface of said substrate to cover said information recording pattern area thereby.
Claim 10
Dependent Claim
35 words
An optical recording medium as claimed in Claim 1, wherein an optical recording material is laminated on the whole surface or a partial surface of said substrate to cover said information recording pattern area thereby.
Claim 11
Dependent Claim
36 words
An optical recording medium as claimed in Claim 1, wherein at least a part of said hologram is comprised of a type of hologram where the reproduced image appears by the irradiation of a laser beam.
Claim 12
Dependent Claim
61 words
A process for making an optical recording medium having on a substrate an information recording pattern distinguishable by a difference in light reflectivity, in which said information recording pattern is formed by a portion of high reflectivity and a portion of low reflectivity, and at least a part of said information recording pattern is formed into a diffraction grating or hologram.
Claim 13
Dependent Claim
61 words
A process for making an optical recording medium having on a substrate an information recording pattern distinguishable by a difference in light reflectivity, in which said information recording pattern is formed by a portion of high reflectivity and a portion of low reflectivity, and at least a part of said information recording pattern is formed into a diffraction grating or hologram.
Claim 14
Dependent Claim
38 words
A process for making an optical recording medium as claimed in Claim 11, wherein the portion of low reflectivity of said information recording pattern is formed by exposure to two coherent luminous fluxes or material and reference waves.
Claim 15
Dependent Claim
47 words
A process for making an optical recording medium as claimed in Claim 11, wherein the portion of low reflectivity of said information recording pattern is formed by exposure to light through a mask having a regular pattern smaller than the size of said portion of low reflectivity.
Claim 16
Dependent Claim
59 words
A process for making an optical recording medium as claimed in Claim 11, wherein exposure to light is carried out through a single mask having both (a) a pattern of the size of an information bit forming said information recording pattern and (b) a regular pattern smaller than the size of an information bit forming said information recording pattern.
References Cited (Backward Citations)
No citation records indexed.
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