Magento-optical recording method using a multi-pulse pattern generation circuit
US5757735A · kind A · utility
18Cited by
4References
32Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 1, 1996 |
| Grant date | May 26, 1998 |
| Priority date | — |
| Expiry date | Aug 1, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B11/10595
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a magneto-optical recording method and, more particularly, a bit position recording method, laser beam intensity is pulse-modulated between high and low levels according to data to be recorded. The modulated laser beam is radiated on a recording medium under the presence of a bias field. High-level emission time of the laser beam is shortened at the inner portion of the medium, and is prolonged at the outer portion. Low-level intensity of the laser beam is decreased at the inner portion of the medium, and is increased at the outer portion, thereby increasing C/N ratio upon reproduction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.