EP0228909A2
Expired / Lapsed
EP
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A magnetooptical storage element
Assignee: Sharp Corp
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Filing: 1986-12-24
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Granted: —
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Expires: 2006-12-24
Abstract
Abstract A magnetooptical storage element comprises a multi-layered structure including a reflecting film (5) which is made of a metal or metalloid having a low thermal conductivity coefficient, preferably tantalum or titanium.
Inventors
- 👤 Yoshiteru Murakami
- 👤 Akira Takahashi
- 👤 Hiroyuki Katayama
- 👤 Kenji Ohta
- 👤 Michinobu Mieda
- 👤 Tomoyuki Miyake
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 17:14
CPC Classifications
G; G11; G11B; G11B11/00; G11B11/10; G11B11/105; G11B11/10582; G11B11/10586; G11B11/10589; G11B11/10591; Y; Y10; Y10S; Y10S428/00; Y10S428/90
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
75 words
A magnetooptical storage element comprising a multi-layered structure having successively a transparent substrate (101), a first transparent dielectric film (102) having a refractive index higher than that of the transparent substrate (101), a thin film (103) of an amorphous alloy containing rare-earth transition metals, a second transparent dielectric film (104), and a reflecting metal film (105), characterised in that the reflecting film is made of a metal or metalloid having a low thermal conductivity coefficient.
Claim 2
Dependent Claim
75 words
A magnetooptical storage element comprising a multi-layered structure having successively a transparent substrate (101), a first transparent dielectric film (102) having a refractive index higher than that of the transparent substrate (101), a thin film (103) of an amorphous alloy containing rare-earth transition metals, a second transparent dielectric film (104), and a reflecting metal film (105), characterised in that the reflecting film is made of a metal or metalloid having a low thermal conductivity coefficient.
Claim 3
Dependent Claim
24 words
A magnetooptical storage element as claimed in Claim 1, wherein the reflecting film is made of tantalum, titanium, lead, zirconium, bismuth, tellurium or selenium.
Claim 4
Dependent Claim
25 words
A magnetooptical storage element as claimed in Claim 1 or 2, wherein the transparent substrate is made of glass, polycarbonate, acrylic resin or epoxy resin.
Claim 5
Dependent Claim
33 words
A magnetooptical storage element as claimed in Claim 1, 2 or 3, wherein the first and second transparent dielectric films are each made of AlN, SiN, Zn N, Si O or Si O₂.
Claim 6
Dependent Claim
22 words
A magnetooptical storage element as claimed in Claim 4, wherein the first and second transparent dielectric films are both made of AlN.
Claim 7
Dependent Claim
35 words
A magnetooptical storage element as claimed in any preceding claim, wherein the thin film is made of an amorphous alloy selected from Gd Tb Fe, Gd Tb Fe Co, Tb Fe and Tb Fe Co.
References Cited (Backward Citations)
No citation records indexed.
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