Magneto-optical recording medium including a calibration magnetic domain recorded in a predetermined pattern in a recording layer
US6847590B2 · kind B2 · utility
0Cited by
5References
3Claims
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Key dates
| Filing date | Aug 17, 2001 |
| Grant date | Jan 25, 2005 |
| Priority date | — |
| Expiry date | Mar 4, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B11/10515
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magneto-optical recording medium which includes a reproducing layer. When a laser beam is irradiated to the magneto-optical recording medium, a magnetic domain in a recording layer is transferred, through enlargement, to a reproducing layer increased in temperature. The magneto-optical recording medium further includes a calibration area that has a calibration magnetic domain recorded in a predetermined pattern in the recording layer. In a reproducing apparatus, a laser beam of an optical head is adjusted in output depending upon a reproduced signal obtained by reproducing the calibration magnetic domain.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.