Adjustment method of optimum write power and optical write/retrieval device
US7978576B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Apr 15, 2010 |
| Grant date | Jul 12, 2011 |
| Priority date | — |
| Expiry date | Apr 15, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/1267
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A power adjustment method in which a modulation index is calculated from reproduced signals of patterns recorded by irradiating light onto an optical information recording medium with a recording power varied and an optimum power of irradiation light is set up using the modulation index. The power adjustment method includes calculating an optimum value PcO of a predetermined correction term Pc using a relation of a value obtained by subtracting the predetermined correction term Pc from the recording power and the modulation index, finding a value Pth of the recording power at which the modulation index becomes substantially zero in the relation of the value obtained by subtracting the optimum value PcO from the recording power and the modulation index, and setting up a value obtained by multiplying the value of Pth by a predetermined constant as a recording power of each of the recording patterns.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.