| 摘要 |
PURPOSE: To record information by a single laser beam by biasing the beam power to an erasing level and increasing the recording level of the beam for a specific time when overwriting the information using a single energy beam. CONSTITUTION: The power is raised to an amorphous level for a short time at the place where the recording medium is to be made amorphous in accordance with the information signal. When the information including a laser beam pulses of length more than twice a shortest pulse length is recorded, the laser beam is divided into original recording waveforms and plural short pulses and are radiated as shown in the center section of the waveforms in a figure. When the laser beam is divided into plural short pulses as mentioned above, it is desirable to make the power lower than a crystallization power level between pulses. By dividing the laser beam into plural pulses to be radiated, a recording pattern is formed on a disk to provide regerative signals which are faithful to original signals. |
