Method for determining optimum irradiation conditions in optical data recording
US5305297A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 13, 1991 |
| Grant date | Apr 19, 1994 |
| Priority date | — |
| Expiry date | Mar 13, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B11/10595
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Before a signal is recorded on an optical disk, irradiations are made with plural light irradiation conditions of variable irradiation power or pulse width, optical conditions of irradiated portions are detected by detecting changes in the reflectivity or transmissivity or errors, and the optimum irradiation conditions are determined by comparing the detected results and the light irradiation conditions. In particular, by determining the optimum irradiation conditions in reference to the point where the change in reflectivity or transmissivity is greatest with respect to changes in the irradiation power, the optimum light irradiation conditions can be determined in a short time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.