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US4596740A
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Recording carrier comprising a magnetooptic recording medium layer consisting of rare earth-transition metal amorphous layer formed on a plastic substrate
Assignee: Daicel Corp
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Filing: 1984-10-05
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Granted: 1986-06-24
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Expires: 2004-10-05
Abstract
Abstract The present invention relates to a magnetooptic recording medium for recording and reproducing information using laser beams and is a magnetooptic recording carrier which forms on a plastic substrate, a polymer layer having a good bondability with the plastic substrate and forming a rare earth-transition metal amorphous layer on the polymer layer.
Inventors
- 👤 Nagayoshi Tsukane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:30
CPC Classifications
G; G11; G11B; G11B11/00; G11B11/10; G11B11/105; G11B11/10582; G11B11/10586; G11B5/00; G11B5/62; G11B5/73; G11B5/739; G11B5/73923; G11B5/73927; G11B5/73937; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
73 words
A magnetooptic recording carrier comprising a transparent plastic substrate; a crosslinked polymer layer having good bondability to the plastic substrate bonded to the plastic substrate, the crosslinked polymer layer being formed from at least one polymer selected from the group consisting of a polyallyl compound, a polyfunctional acrylic compound, a thermosetting resin, a hydrolyzate of an alkyl silicate and an organopolysiloxane; and, on said crosslinked polymer layer, a rare earth-transition metal amorphous layer.
Claim 2
Dependent Claim
73 words
A magnetooptic recording carrier comprising a transparent plastic substrate; a crosslinked polymer layer having good bondability to the plastic substrate bonded to the plastic substrate, the crosslinked polymer layer being formed from at least one polymer selected from the group consisting of a polyallyl compound, a polyfunctional acrylic compound, a thermosetting resin, a hydrolyzate of an alkyl silicate and an organopolysiloxane; and, on said crosslinked polymer layer, a rare earth-transition metal amorphous layer.
Claim 3
Dependent Claim
53 words
The magnetooptic recording carrier as defined in claim 1, in which the transparent plastic substrate is made of an acrylic resin, polycarbonate resin, styrenic resin or polyester resin, and the rare earth-transition metal amorphous layer is formed with material selected from the group consisting of Tb-Fe, Tb-Fe-Co, Dy-Fe, Gd-Tb-Fe, Gd-Tb-Dy-Fe and Gd-Co alloys.
Claim 4
Dependent Claim
23 words
The magnetooptic recording carrier as defined in claim 1 or 2, in which the thickness of the crosslinked polymer layer is between 0.01-10μ.
Claim 5
Dependent Claim
63 words
The magnetooptic recording carrier as defined in claim 3 further comprising, formed on the surface of the rare earth-transition metal amorphous layer on the side opposite the crosslinked polymer layer; a reflection layer or, a dielectric layer or, a reflection layer having a dielectric layer formed on the surface thereof, or a dielectric layer having a reflection layer formed on the surface thereof.
References Cited (Backward Citations)
US4334233A
Cited
US4467383A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-06-23 | 1989-12-23 | 1990-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-23 | 1993-12-23 | 1994-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-23 | 1997-12-23 | 1998-06-24 | $7700.00 | Window Closed / Lapsed |