Magneto-optical recording method using laser beam intensity setting based on playback signal
US5825724A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 5, 1996 |
| Grant date | Oct 20, 1998 |
| Priority date | — |
| Expiry date | Nov 5, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B11/10595
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method of performing stabilized overwriteable optical recording, wherein overwriting is performed sufficiently even when erasure becomes poor when the low level laser beam intensity P.sub.L is set too low. The low level of recording laser beam intensity is set by playing back a test recording region by illuminating magnetization reversal areas after magnetization reversal areas have been formed in test regions of an overwriteable optical recording medium. Further, an erasure factor is found from the playback signal. In a second embodiment of a method of setting the recording laser beam intensity in order to perform recording on an overwriteable optical recording medium, before a test recording is performed, magnetization reversal areas are formed in a test recording region. These magnetization reversal areas are not erased, and a test recording is performed in this region by overwriting.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.