Initialization of phase-change optical recording medium
US6445669B1 · kind B1 · utility
35Cited by
5References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 23, 1999 |
| Grant date | Sep 3, 2002 |
| Priority date | — |
| Expiry date | Dec 23, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/127
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method of initializing a phase-change optical information recording medium is provided, using an optical system incorporating a semiconductor laser device. The laser device is characterized by a specified spatial power distribution. In a spatial distribution of the laser power focused on the recording medium, in the direction perpendicular to guide tracks the laser device preferably has less average smaller in both end regions of the spatial distribution, which have each 10% of the width at half maximum of the distribution, than the average in the center region of the full width at half maximum of the distribution.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.