Magnetooptic recording medium containing a multilayer protection film with at least one transition zone between the protection layers
US4994330A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 13, 1990 |
| Grant date | Feb 19, 1991 |
| Priority date | — |
| Expiry date | Mar 13, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/265
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a sheet-like, multilayer, magneto-optical recording material which has a base which is transparent to light, a thermally alterable recording layer of an amorphous lanthanide transition metal alloy and, on the base remote side of this recording layer, an anticorrosion layer containing carbides, nitrides and/or oxides, the anticorrosion layer PA1 (a) is from 30 to 250 nm thick and PA1 (b) consists of two or more components which PA1 (c) are present in four or more separate strata, each consisting of one of the components, PA1 (d) one or more of the components being selected from the group consisting of the elements boron, aluminum, silicon, titanium, zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum and tungsten and PA1 (e) one or more of the other components being selected from the group consisting of the carbides, nitrides and oxides of these elements (d) and PA1 (f) directly adjacent strata always consisting of components which differ from one another.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.