Patent US5576707A successfully refreshed from Google Patents.
Patent US6014364A successfully refreshed from Google Patents.
US6014364A
Expired / Lapsed
US
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Optical information recording medium and method of manufacturing
Assignee: MEDIA LINKS Inc
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Filing: 1999-05-25
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Granted: 2000-01-11
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Expires: 2019-05-25
Abstract
Abstract An optical information recording medium which can be played back by both a playback system for an SD (Super-density Disk) and a playback system for an HDMCD (High Density Multimedia Compact Disk), or by both the playback system for the SD and a playback system for a CD (Compact Disk). The optical information recording medium comprises a first transparent substrate which includes a smooth surface, and a first information surface bearing pits correspondent to first recorded information, the first information surface being covered with a semitransparent film which transmits part of a playback beam and reflects part thereof; and a second transparent substrate which includes a smooth surface, and a second information surface bearing pits correspondent to second recorded information, the second information surface being covered with a reflective film which reflects the greater part of the playback beam; the second transparent substrate being stacked on the first transparent substrate with the first information surface of the latter overlaid by the smooth surface of the former.
Inventors
- 👤 Akihiko Takasu
- 👤 Kazuho Kato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 21:40
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/26; G11B7/002; G11B7/0037; G11B7/241; G11B7/252; G11B7/253
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
173 words
A method of manufacturing an optical information recording medium comprising the steps of: forming a first transparent substrate, the first transparent substrate having a first information surface and a first smooth surface, the first information surface being formed in a first format that is reproducible by a first playback beam having a first wavelength; forming a second transparent substrate, the second transparent substrate having a second information surface and a second smooth surface, the second smooth surface being formed in a second format different from the first format and reproducible by a second playback beam having a second wavelength different from the first wavelength; forming a partially reflective first layer on the first information surface that reflects a portion of the first playback beam and transmits a portion of the second playback beam; forming a reflective second layer on the second information surface that reflects the majority of the second playback beam; adhering the second transparent substrate to the first transparent substrate such that the first information surface faces the second smooth surface.
Claim 2
Independent Claim
173 words
A method of manufacturing an optical information recording medium comprising the steps of: forming a first transparent substrate, the first transparent substrate having a first information surface and a first smooth surface, the first information surface being formed in a first format that is reproducible by a first playback beam having a first wavelength; forming a second transparent substrate, the second transparent substrate having a second information surface and a second smooth surface, the second smooth surface being formed in a second format different from the first format and reproducible by a second playback beam having a second wavelength different from the first wavelength; forming a partially reflective first layer on the first information surface that reflects a portion of the first playback beam and transmits a portion of the second playback beam; forming a reflective second layer on the second information surface that reflects the majority of the second playback beam; adhering the second transparent substrate to the first transparent substrate such that the first information surface faces the second smooth surface.
Claim 3
Dependent Claim
19 words
The method of claim 1, wherein the first layer is a film and the second layer is a film.
Claim 4
Dependent Claim
14 words
The method of claim 2, wherein the first layer is formed of a dielectric.
Claim 5
Dependent Claim
14 words
The method of claim 2, wherein the first layer is formed of a metal.
Claim 6
Dependent Claim
21 words
The method of claim 1, wherein the reflectance of the second layer is approximately 70 percent for the second playback beam.
Claim 7
Dependent Claim
21 words
The method of claim 1, wherein the reflectance of the first layer is approximately 30 percent for the first playback beam.
Claim 8
Dependent Claim
33 words
The method of claim 1, wherein the adhering step is performed by applying an ultraviolet-hardening resin between the first information surface and the second smooth surface and irradiating the resin with ultraviolet radiation.
Claim 9
Dependent Claim
25 words
The method of claim 1, wherein a recording density of the first information surface is higher than a recording density of the second information surface.
Claim 10
Dependent Claim
17 words
The method of claim 1, wherein a thickness of the first transparent substrate is approximately 0.6 millimeters.
Claim 11
Dependent Claim
17 words
The method of claim 1, wherein the thickness of the second transparent substrate is approximately 0.6 millimeters.
Claim 12
Dependent Claim
20 words
The method of claim 1, wherein the combined thicknesses of the first and second transparent substrates is approximately 1.2 millimeters.
Claim 13
Dependent Claim
16 words
The method of claim 1, wherein the first format conforms to a digital video disc specification.
Claim 14
Dependent Claim
15 words
The method of claim 1, wherein the second format conforms to a compact disc specification.
Claim 15
Dependent Claim
14 words
The method of claim 13, wherein the compact disc specification is the CD-ROM specification.
Claim 16
Dependent Claim
13 words
The method of claim 1, wherein the first wavelength is approximately 650-680 nanometers.
Claim 17
Dependent Claim
13 words
The method of claim 1, wherein the second wavelength is approximately 780 nanometers.
Claim 18
Dependent Claim
27 words
The method of claim 1, wherein information stored on the first information surface conforms to a data compression method in accordance with Moving Pictures Expert Group 2.
Claim 19
Dependent Claim
27 words
The method of claim 1, wherein information stored on the second information surface conforms to a data compression method in accordance with Moving Pictures Expert Group 1.
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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) | 2003-01-10 | 2003-07-12 | 2004-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-01-10 | 2007-07-12 | 2008-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-01-10 | 2011-07-12 | 2012-01-11 | $7700.00 | Window Closed / Lapsed |