Optical-disc drive apparatus and method of deciding optimum recording powers of laser beam
US7872956B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 23, 2005 |
| Grant date | Jan 18, 2011 |
| Priority date | — |
| Expiry date | Oct 13, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2007/0013
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In cases where forthcoming recording of information on a multi-layer optical disc is first time one, test signals are recorded on trial write areas in first and second recording layers before being reproduced. First-time optimum recording powers of the laser beam for the respective first and second recording layers are decided in response to the reproduced test signals. In cases where forthcoming recording is not first time one, the test signals are recorded on only the trial write area in the first recording layer before being reproduced. A new optimum recording power for the first recording layer is described in response to the reproduced test signals. Thereafter, a new optimum recording power for the second recording layer is calculated from (1) the new optimum recording power for the first recording layer and (2) the ratio between the first-time optimum recording powers for the first and second recording layers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.