Single-sided triple layer optical disc
US7652967B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Aug 16, 2006 |
| Grant date | Jan 26, 2010 |
| Priority date | — |
| Expiry date | Dec 14, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2220/235
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical disc is based on the following the distance of the light transmission layer from a light incidence plane to the first recording layer is a minimum of 550 μm. The distance between the first and the third recording layer is a maximum of 72 μm. The distance between the second and the third recording layer is a minimum of 15 μm. The distance between the first and the second recording layer is about 31 to 40 μm. The reflectivities of the first and the second recording layer with respect to the first laser beam are 18% or more, and the ratio between the reflectivities is about 1.15 or less. The areal recording density of the third recording layer is three times or more as high as the areal recording density of the first and the second recording layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.