Magneto-optical storage medium with double mask
US6124048A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 24, 1999 |
| Grant date | Sep 26, 2000 |
| Priority date | — |
| Expiry date | Jun 24, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S428/928
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magneto-optical storage medium for the repeated writing of information at a write temperature T.sub.w, or at two write temperatures T.sub.h, T.sub.i, above the room temperature T.sub.a and for the repeated reading out at a temperature T.sub.m, with a front mask at the temperature T.sub.f and a rear mask at a temperature T.sub.r, above the room temperature T.sub.a, in an external magnetic field H.sub.e, which medium includes a substrate, a first magnetic layer which is disposed on the substrate and has a temperature-dependent coercivity H.sub.C1 (T), a compensation temperature T.sub.cp1 and a Curie temperature T.sub.C1, a second magnetic layer which is disposed on the first magnetic layer and has a temperature-dependent coercivity H.sub.C2 (T), a compensation temperature T.sub.cp2 and a Curie temperature T.sub.C2, and a third magnetic layer which is disposed on the second magnetic layer and has a temperature-dependent coercivity H.sub.C3 (T), a compensation temperature T.sub.cp3 and a Curie temperature T.sub.C3, where: EQU T.sub.a <T.sub.f <T.sub.m .ltoreq.T.sub.cp1 .ltoreq.T.sub.cp2 <T.sub.C2 <T.sub.r <T.sub.C1 <T.sub.cp3 <T.sub.C3 .ltoreq.T.sub.w EQU and EQU H.sub.C1 (T)<H.sub.e…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.