Optical information recording medium and method for initializing the same
US6807142B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | May 25, 2001 |
| Grant date | Oct 19, 2004 |
| Priority date | — |
| Expiry date | Jan 11, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/268
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical information recording medium including a first and second information layers is provided with an area where only the first information layer, which is provided nearer a substrate, exists, and initialization using a laser beam is started from this area. In an area where the second information layer exists, the first information layer is initialized after the second information layer is initialized. Alternatively, the first and second information layers are initialized at the same time by a flash light with adjusted emission time, emission energy, and the like. The first information layer is initialized after the second information layer is initialized by radiating a plurality of flash lights.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.