Optical recording device having a medium with two superimposed levels and method for reading
US6229783A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 2, 2000 |
| Grant date | May 8, 2001 |
| Priority date | — |
| Expiry date | Mar 2, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/005
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical recording device including a medium having a first recording level, which includes a first active film having amorphous areas and crystalline areas, the first recording level being configured to produce a phase difference between an optical beam reflected by the amorphous areas and an optical beam reflected by the crystalline areas; and a second recording level superimposed on the first recording level and including a second active layer with first areas and second areas, the second recording level being configured to produce an intensity difference between an optical beam reflected by the first areas and an optical beam reflected by the second areas.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.