US5430696A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magneto-optical recording medium
Assignee: Ricoh Co Ltd
•
Filing: 1994-04-28
•
Granted: 1995-07-04
•
Expires: 2014-04-28
Abstract
Abstract A magneto-optical recording method capable of overwriting on a magneto-optical recording medium is disclosed. The magneto-optical recording medium includes a recording layer comprising a single magnetic layer with magnetic anisotropy and the magneto-optical recording methods includes the step of applying a laser beam with a light power level P1 to the recording layer when a binary coded signal "1" is written therein under a fixed external magnetic field; and the steps of applying a laser beam with a light power level Poh to the recording layer and successively applying a laser beam with a light power level Pol to said recording layer when a binary coded signal "0" is written therein under a fixed external magnetic field, wherein Pol, P1 and Poh are in the relationship of O<Pol<P1<Poh.
Inventors
- 👤 Toshiaki Tokita
- 👤 Motoharu Tanaka
- 👤 Atsuyuki Watada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:09
CPC Classifications
G; G11; G11B; G11B11/00; G11B11/10; G11B11/105; G11B11/10502; G11B11/1053; G11B11/10504; G11B11/10506; G11B11/10517; G11B11/10519; G11B11/10521
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
153 words
A magneto-optical recording medium comprising a substrate and a recording layer formed thereon consisting of a single magnetic layer with magnetic anisotropy, with the difference between the compensation temperature and the Curie temperature of said single magnetic layer being less than or equal to 150° C. for use in a magneto-optical recording method capable of overwriting on said magneto-optical recording medium comprising the step of applying a laser beam with a light power level P 1 to said recording layer when a binary coded signal "1" is written therein under a fixed external magnetic field; and the steps of successively applying a laser beam with a light power level Poh and a laser beam with a light power level Pol to said recording layer when a binary coded signal "0" is written therein under a fixed external magnetic field, wherein Pol, P 1 and Poh are in the relationship of O<Pol<P 1 <Poh.
Claim 2
Dependent Claim
153 words
A magneto-optical recording medium comprising a substrate and a recording layer formed thereon consisting of a single magnetic layer with magnetic anisotropy, with the difference between the compensation temperature and the Curie temperature of said single magnetic layer being less than or equal to 150° C. for use in a magneto-optical recording method capable of overwriting on said magneto-optical recording medium comprising the step of applying a laser beam with a light power level P 1 to said recording layer when a binary coded signal "1" is written therein under a fixed external magnetic field; and the steps of successively applying a laser beam with a light power level Poh and a laser beam with a light power level Pol to said recording layer when a binary coded signal "0" is written therein under a fixed external magnetic field, wherein Pol, P 1 and Poh are in the relationship of O<Pol<P 1 <Poh.
Claim 3
Dependent Claim
24 words
The magneto-optical recording medium as claimed in claim 1, wherein said recording layer has a thickness in the range of 20 to 150 nm.
Claim 4
Dependent Claim
21 words
The magneto-optical recording medium as claimed in claim 1, further comprising an undercoat layer between said substrate and said recording layer.
Claim 5
Dependent Claim
21 words
The magneto-optical recording medium as claimed in claim 1, further comprising a protective layer which is overlaid on said recording layer.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-07-03 | 1999-01-02 | 1999-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-07-03 | 2003-01-02 | 2003-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-07-03 | 2007-01-02 | 2007-07-04 | $7700.00 | Window Closed / Lapsed |