US5138604A
Expired / Lapsed
US
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Optical recording method having two degrees of reflectivity and a diffraction grating or hologram formed integrally thereon and process for making it
Assignee: Dai Nippon Printing Co Ltd
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Filing: 1989-04-12
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Granted: 1992-08-11
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Expires: 2009-04-12
Abstract
Abstract An optical recording medium of the present invention has on a substrate information recording patterns (2) and (3) distinguishable by a difference in light reflectivity, and is characterized in that said information recording pattern (2) is comprised of a portion (2a) of high reflectivity and a portion (2b) of low reflectivity and at least a part of said information recording patterns is formed by a diffraction grating or hologram (3). Since such plural types of information can be formed at the same time and at high density, the present invention has a merit of its having excellent fake-proofness and its manufacturing process being simplified.
Inventors
- 👤 Kazuo Umeda
- 👤 Yuji Kondo
- 👤 Toshiharu Ishikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:31
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: 17
Claim 1
Independent Claim
50 words
An optical recording medium comprising: a substrate; and an information recording pattern formed on the substrate, said information recording pattern including a portion of high reflectivity and a portion of low reflectivity, the portion of low reflectivity of the information recording pattern having a diffraction grating or hologram superimposed thereon.
Claim 2
Dependent Claim
50 words
An optical recording medium comprising: a substrate; and an information recording pattern formed on the substrate, said information recording pattern including a portion of high reflectivity and a portion of low reflectivity, the portion of low reflectivity of the information recording pattern having a diffraction grating or hologram superimposed thereon.
Claim 3
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 groove of a part of said diffraction grating is varied.
Claim 4
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 the pitch of a portion of said diffraction grating is varied.
Claim 5
Dependent Claim
31 words
An optical recording medium as claimed in claim 1, wherein said information recording pattern includes a diffraction grating, and is formed by overlapping parts of said diffraction grating having varied angles.
Claim 6
Dependent Claim
14 words
An optical recording medium as claimed in claim 1, which is an optical card.
Claim 7
Dependent Claim
14 words
An optical recording medium as claimed in claim 1, which is an optical disk.
Claim 8
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 9
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 10
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 11
Dependent Claim
35 words
An optical recording medium as claimed in claim 1, wherein the portion of low reflectivity of said information recording pattern is formed by exposure to two coherent bundle of rays or object and reference beams.
Claim 12
Dependent Claim
37 words
An optical recording medium as claimed in claim 1, wherein the portion of low reflectivity of said information recording pattern is formed by exposure to light through a mask having a regular pattern of a diffraction grating.
Claim 13
Dependent Claim
55 words
An optical recording medium as claimed in claim 1, 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 9b) a regular pattern smaller than the size of the information bit forming said information recording pattern.
Claim 14
Dependent Claim
64 words
An optical recording medium comprising: a substrate; and means for displaying information on said substrate, said means for displaying information including a first information pattern encoded in either an area of first reflectivity or an area of second reflectivity, and a second information pattern encoded in a diffraction grating or hologram formed integrally with said substrate and superimpsoed on said area of first reflectivity.
Claim 15
Dependent Claim
64 words
An optical recording medium comprising: a substrate; and means for displaying information on said substrate, said means for displaying information including a first information pattern encoded in either an area of first reflectivity or an area of second reflectivity, and a second information pattern encoded in a diffraction grating or hologram formed integrally with said substrate and superimpsoed on said area of first reflectivity.
Claim 16
Dependent Claim
62 words
An optical recording medium comprising: a substrate, said substrate having an information recording area having a first portion of first reflectivity and a second portion of second reflectivity; and means for inhibiting counterfeiting, said means including a diffraction grating or hologram formed integrally with said substrate and superimposed on said first portion of first reflectivity or said second portion of second reflectivity.
Claim 17
Dependent Claim
62 words
An optical recording medium comprising: a substrate, said substrate having an information recording area having a first portion of first reflectivity and a second portion of second reflectivity; and means for inhibiting counterfeiting, said means including a diffraction grating or hologram formed integrally with said substrate and superimposed on said first portion of first reflectivity or said second portion of second reflectivity.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-08-11 | 1996-02-10 | 1996-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-08-11 | 2000-02-10 | 2000-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-08-11 | 2004-02-10 | 2004-08-11 | $7700.00 | Window Closed / Lapsed |