Multi-layer optical record carrier not requiring spherical aberration correction
US6538978B1 · kind B1 · utility
6Cited by
3References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 21, 1997 |
| Grant date | Mar 25, 2003 |
| Priority date | — |
| Expiry date | Nov 6, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2007/13727
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical information storage system has a multi-recording-layer record carrier and a scanner device for the carrier. The scanner produces a radiation beam which is compensated for spherical aberration for a single height of the scanning spot with the stack of layers. The height of the stack is determined by the maximum spherical aberration permissible for the system. The number of layers in the stack is determined by the minimum distance between layers, which depends on the crosstalk in the error signals due to currently unscanned layers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.