US5828648A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical information recording medium and method of manufacturing
Assignee: MEDIA LINKS Inc
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Filing: 1997-06-25
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Granted: 1998-10-27
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Expires: 2017-06-25
Abstract
Abstract An optical information recording medium which can be played back by both a playback system for an SD (Superdensity 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 21:13
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: 9
Claim 1
Independent Claim
79 words
An optical information recording medium comprising: a first information surface having first information that is reproducible by a first reproducing system, said first reproducing system being designed for an optical information recording medium whose transparent substrate is approximately 0.6 (mm) in thickness; and a second information surface having second information that is reproducible by a second reproducing system, said second reproducing system being designed for an optical information recording medium whose transparent substrate is approximately 1.2 (mm) in thickness.
Claim 2
Dependent Claim
79 words
An optical information recording medium comprising: a first information surface having first information that is reproducible by a first reproducing system, said first reproducing system being designed for an optical information recording medium whose transparent substrate is approximately 0.6 (mm) in thickness; and a second information surface having second information that is reproducible by a second reproducing system, said second reproducing system being designed for an optical information recording medium whose transparent substrate is approximately 1.2 (mm) in thickness.
Claim 3
Dependent Claim
81 words
An optical information recording medium comprising: first information storing means for storing first information that is reproducible by a first reproducing system, said first reproducing system being designed for an optical information recording medium whose transparent substrate is approximately 0.6 (mm) in thickness; and second information storing means for storing second information that is reproducible by a second reproducing system, said second reproducing system being designed for an optical information recording medium whose transparent substrate is approximately 1.2 (mm) in thickness.
Claim 4
Dependent Claim
81 words
An optical information recording medium comprising: first information storing means for storing first information that is reproducible by a first reproducing system, said first reproducing system being designed for an optical information recording medium whose transparent substrate is approximately 0.6 (mm) in thickness; and second information storing means for storing second information that is reproducible by a second reproducing system, said second reproducing system being designed for an optical information recording medium whose transparent substrate is approximately 1.2 (mm) in thickness.
Claim 5
Dependent Claim
33 words
The optical information recording medium of claim 2, wherein each of said first information and said second information is reproduced from one side of said optical information recording medium by different playback devices.
Claim 6
Dependent Claim
23 words
The optical information recording medium of claim 2, wherein each of said first information and said second information is recorded in different formats.
Claim 7
Dependent Claim
23 words
The optical information recording medium of claim 3, wherein each of said first information and said second information is recorded in different formats.
Claim 8
Dependent Claim
26 words
The optical information recording medium of claim 2, wherein the recording density of said first information is higher than the recording density of said second information.
Claim 9
Dependent Claim
26 words
The optical information recording medium of claim 3, wherein the recording density of said first information is higher than the recording density of said second information.
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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) | 2001-10-26 | 2002-04-27 | 2002-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-10-26 | 2006-04-27 | 2006-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-10-26 | 2010-04-27 | 2010-10-27 | $7700.00 | Window Closed / Lapsed |