US5015548A
Expired / Lapsed
US
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Erasable phase change optical recording elements and methods
Assignee: Eastman Kodak Co
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Filing: 1990-06-21
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Granted: 1991-05-14
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Expires: 2010-06-21
Abstract
Abstract An optical recording element comprising a thin film optical recording layer of an alloy is disclosed. The alloy is represented by the formula Sb x Te 1-x , wherein x is between about 0.58 and 0.75. The alloys have short erasure times (amorphous to crystalline transition) and excellent environmental stability.
Inventors
- 👤 Kee-Chuan Pan
- 👤 Yuan-Sheng Tyan
- 👤 Fridrich Vazan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 00:33
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/242; G11B7/243; G11B2007/24302; G11B2007/24314; G11B2007/24316; G11B7/004; G11B7/0045; G11B7/00454; Y; Y10; Y10S; Y10S430/00; Y10S430/146
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
136 words
A method of recording and erasing information on an optical recording element, said element comprising a thin film optical recording layer of an alloy in a crystalline form, said alloy represented by the formula Sb x Te 1-x , wherein x is between about 0.58 and 0.75, said method comprising the steps of: (a) recording said information by focusing an information modulated laser beam on said cystalline alloy recording layer at a power and for a time sufficient to form a pattern of amorphous areas in said layer of alloy, said pattern corresponding to said information, and (b) focusing a laser beam on said recorded layer for a time and at a power sufficient to crystallize at least a portion of the amorphous areas formed in step a), thereby erasing the information in said amorphous areas.
Claim 2
Independent Claim
136 words
A method of recording and erasing information on an optical recording element, said element comprising a thin film optical recording layer of an alloy in a crystalline form, said alloy represented by the formula Sb x Te 1-x , wherein x is between about 0.58 and 0.75, said method comprising the steps of: (a) recording said information by focusing an information modulated laser beam on said cystalline alloy recording layer at a power and for a time sufficient to form a pattern of amorphous areas in said layer of alloy, said pattern corresponding to said information, and (b) focusing a laser beam on said recorded layer for a time and at a power sufficient to crystallize at least a portion of the amorphous areas formed in step a), thereby erasing the information in said amorphous areas.
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) | 1994-05-13 | 1994-11-12 | 1995-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-13 | 1998-11-12 | 1999-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-13 | 2002-11-12 | 2003-05-14 | $7700.00 | Window Closed / Lapsed |