EP0285241A2
Expired / Lapsed
EP
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Magneto-optic information-carrying medium
Assignee: Mitsubishi Electric Corp
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Filing: 1988-02-09
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Granted: —
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Expires: 2008-02-09
Abstract
Abstract A magneto-optic information-carrying medium comprises three magnetic layers (3,4,10). Two of these layers (3,4) are accessed by a laser beam to read out or write in information while the third layer (10) is premagnetized to create a magnetic bias field without the need for external magnets.
Inventors
- 👤 Michihiro Mitsubishi Denki Kabushiki Tadokoro
- 👤 Kazuo Mitsubishi Denki Kabushiki Okada
- 👤 Hitoshi Mitsubishi Denki Kabushiki Imai
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 03:10
CPC Classifications
G; G11; G11B; G11B11/00; G11B11/10; G11B11/105; G11B11/10582; G11B11/10586; G11B11/10502; G11B11/10504; G11B11/10506; G11B11/10517; G11B11/10519; G11B11/10521; Y; Y10; Y10S; Y10S428/00; Y10S428/90
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
54 words
A magneto-optic storage medium comprising a substrate (2), a first magnetic layer (3), and a second magnetic layer (4), the layers (3,4) being illuminated by a laser beam, during use, for writing or reading information, characterised by a third magnetic layer (10) which is premagnetized in a uniform direction parallel to the thickness thereof.
Claim 2
Dependent Claim
54 words
A magneto-optic storage medium comprising a substrate (2), a first magnetic layer (3), and a second magnetic layer (4), the layers (3,4) being illuminated by a laser beam, during use, for writing or reading information, characterised by a third magnetic layer (10) which is premagnetized in a uniform direction parallel to the thickness thereof.
Claim 3
Dependent Claim
57 words
A storage medium according to claim 1, wherein, the Curie temperature of the second layer (4) is higher than that of the first layer (3) but lower than that of the third layer (10), and the coercive force of the second layer (4) is less than that of the first layer (3) and the third layer (10).
Claim 4
Dependent Claim
25 words
A storage medium according to claim 2, wherein, the coercive force of the third layer (10) is less than that of the first layer (3).
Claim 5
Dependent Claim
25 words
A storage medium according to anyone of claims 1 to 3, wherein, the third layer (10) is premagnetized in the direction of the substrate (2).
Claim 6
Dependent Claim
24 words
A storage medium according to anyone of claims 1 to 3, wherein, the third layer (10) is premagnetized in the direction opposite the substrate.
References Cited (Backward Citations)
No citation records indexed.
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