Optical recording medium for writing data using multiple pulses
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United States of America Patent
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Aug 7, 2012
Grant Date -
Feb 2, 2012
app pub date -
Oct 4, 2011
filing date -
Jun 18, 2007
priority date (Note) -
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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 OT 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.
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