Rewritable disk-shaped optical recording medium
US5724338A · kind A · utility
30Cited by
9References
21Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 13, 1996 |
| Grant date | Mar 3, 1998 |
| Priority date | — |
| Expiry date | Sep 13, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/261
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magneto-optical recording medium includes at least a reading layer and a writing layer on a substrate. A track guide groove is formed in the medium so as to include in-groove portions and on-land portions. Only a portion where a temperature has been raised by optical beam irradiation is read, while a domain of a writing layer is copied on the writing layer, whereby a writing/reading operation can be effected with narrower track pitches. By this arrangement, there can be realized a narrow track pitch which is narrower than the diameter of a laser beam.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.