| 摘要 |
PROBLEM TO BE SOLVED: To make possible optical recording of high sensitivity having few jitter by dividing a mark length into plural numbers of pulses and projecting a bias power lower than a recording power at the OFF time of the recording power in the recording of the mark length. SOLUTION: At the time of recording a signal having a mark length nT (n: natural number, T: reference clock period) in a write-once type medium by projecting a light beam, the mark length nT is divided into plural numbers of recording pulses. A power Pw is a recording power for forming a pit in a recording layer, a bias power Pb is applied in the OFF time interval of Pw in the mark and temp. distribution in one mark is properly controlled. By representing a reproducing pulse required for tracking by Pr, irradiation is performed by setting the powers so as to be Pw>Pb>Pr. Consequently, the recording method of the write-once type medium of high sensitivity having few jitter is provided. |
