Optical recording medium for writing data using multiple pulses
US8422353B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 4, 2011 |
| Grant date | Apr 16, 2013 |
| Priority date | — |
| Expiry date | Oct 4, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/2495
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical recording medium including a plurality of recording layers to record/reproduce information using light with a predetermined wavelength, the information being recorded on one of the recording layers using a mark and a space, wherein a channel clock period T is provided for recording the mark on one of the recording layers. A plurality of pulses, including a last pulse arranged at an end of the pulses, are used to record the mark with length 3T, the mark being recorded with a condition that a width of the last pulse is minimum 0T and maximum 1.10T, in which a first subsequent level lower than a peak power level of the last pulse is arranged next to the last pulse, and a second subsequent level lower than the peak power level but higher than the first subsequent level is arranged next to the first subsequent level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.