US5031162A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magneto-optical recorded medium with a transparent substrate layer
Assignee: Deutsche Thomson Brandt GmbH
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Filing: 1988-09-28
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Granted: 1991-07-09
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Expires: 2008-09-28
Abstract
Abstract An optically-recorded medium in which a reflecting optomagnetic layer is applied to a transparent substrate layer. The recorded medium stores data magnetically and by pits. The magnetically stored data and the pit stored data are superimposed on each other, so that every spot and region on the recorded medium stores both magnetically stored data and pit stored data. The recorded medium is not divided into separate regions for magnetically stored data and pit stored data, and the magnetically stored data and pit stored data may be read out simultaneously by a single light beam.
Inventors
- 👤 Yasuaki Morimoto
- 👤 Friedhelm Zucker
- 👤 Christian Buchler
- 👤 Heinz-Jorg Schroder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:46
CPC Classifications
G; G11; G11B; G11B13/00; G11B13/04; G11B11/00; G11B11/10; G11B11/105; G11B11/10582; G11B13/045; G11B11/10595; G11B11/10597; G11B7/00; G11B7/24; G11B7/2407; G11B7/24085
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
108 words
An optomagnetic recording medium comprising: a transparent substrate layer; a reflective optomagnetic layer on said transparent substrate layer; said reflective optomagnetic layer being recorded with magnetic data and pit data so that said recorded magnetic data and said recorded pit data are superimposed on each other in said optomagnetic layer and so that every spot and region on said recording medium stores both said magnetic and pit data and so that said recorded magnetic and pit data are arranged for being read out simultaneously by a single light beam and said recording medium being free of separate regions between the magnetic and pit data in a track direction.
Claim 2
Dependent Claim
108 words
An optomagnetic recording medium comprising: a transparent substrate layer; a reflective optomagnetic layer on said transparent substrate layer; said reflective optomagnetic layer being recorded with magnetic data and pit data so that said recorded magnetic data and said recorded pit data are superimposed on each other in said optomagnetic layer and so that every spot and region on said recording medium stores both said magnetic and pit data and so that said recorded magnetic and pit data are arranged for being read out simultaneously by a single light beam and said recording medium being free of separate regions between the magnetic and pit data in a track direction.
Claim 3
Dependent Claim
23 words
An optomagnetic recording medium as defined in claim 1, wherein said pits have a depth less than a wavelength of said light beam.
Claim 4
Dependent Claim
25 words
An optomagnetic recording medium as defined in claim 2, wherein said pits have depressions with depths substantially 1/10 of a wavelength of said light beam.
Claim 5
Dependent Claim
25 words
An optomagnetic recording medium as defined in claim 1, wherein said pits have depressions with depths substantially half of a wavelength of said light beam.
Claim 6
Dependent Claim
30 words
An optomagnetic recording medium as defined in claim 1, wherein said pits have depressions with depths that are substantially an odd multiple of half a wavelength of said light beam.
Claim 7
Dependent Claim
25 words
An optomagnetic recording medium as defined in claim 1, wherein said pits have depressions with depths substantially 1/4 of a wavelength of said light beam.
Claim 8
Dependent Claim
37 words
An optomagnetic recording medium as defined in claim 6, wherein said optomagnetic layer is penetrated by a part of said light beam and said optomagnetic layer reflects a part of said light beam carrying optomagnetically stored data.
Claim 9
Dependent Claim
30 words
An optomagnetic recording medium as defined in claim 1, wherein said pits have depressions with depths that are substantially an odd multiple of 1/4 a wavelength of said light beam.
Claim 10
Dependent Claim
33 words
An optomagnetic recording medium as defined in claim 1, wherein said pits are located on a surface of said optomagnetic layer facing toward and contacting said substrate layer and said reflecting optomagnetic layer.
Claim 11
Dependent Claim
24 words
An optomagnetic recording medium as defined in claim 1, wherein data stored in said optomagnetic layer are correlated with data stored as said pits.
Claim 12
Dependent Claim
43 words
An optomagnetic recording medium as defined in claim 1, wherein said optomagnetic layer reflects a part of said light beam with optomagnetically stored data and said optomagnetic layer is penetrated by a part of said light beam carrying data stored as said pits.
Claim 13
Dependent Claim
59 words
An optomagnetic recording medium as defined in claim 1, wherein said optomagnetic layer reflects a part of said light beam with optomagnetically stored data and said optomagnetic layer is penetrated by a part of said light beam carrying data stored as said pits, said pits being located on a surface of said optomagnetic layer facing away from the substrate.
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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) | 1994-07-08 | 1995-01-07 | 1995-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-08 | 1999-01-07 | 1999-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-08 | 2003-01-07 | 2003-07-09 | $7700.00 | Window Closed / Lapsed |