Multi-layer optical disk and method of producing multi-layer optical disk
US7315508B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 27, 2001 |
| Grant date | Jan 1, 2008 |
| Priority date | — |
| Expiry date | Mar 27, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/261
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A multilayer optical disk including a plurality of information storage layers to/from which information is recorded and/or reproduced by an optical head. The plurality of information storage layers are stacked through intermediate layers and each information storage layer includes a wobbling track groove. The shape factors (amplitude of wobbling, depth of the track groove and/or slope angle of the side wall of the track groove, etc.) of the track groove of at least one information storage layer of the plurality of information storage layers are different from the shape factors of track grooves of other information storage layers. This allows a satisfactory signal to be reproduced from each information storage layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.