Method of writing multi-level data using adjusted recording waveform
US7688695B2 · kind B2 · utility
0Cited by
8References
21Claims
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Key dates
| Filing date | Mar 16, 2005 |
| Grant date | Mar 30, 2010 |
| Priority date | — |
| Expiry date | Oct 31, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/00456
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method of writing multi-level data to a recording medium is disclosed. The multi-level data is written by the emission of light beam. The method is characterized in that a write waveform that controls the emission of the light beam includes a first top pulse, an off pulse, and an erase pulse. The method is further characterized in that, if the value of the multi-level data falls in a predetermined range, a second top pulse is inserted between the first top pulse and the erase pulse of the write waveform that controls the emission of the light beam to write the value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.