| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical disk device having high reliability even during high double speed reproduction, by solving the deterioration of SNR caused by the acceleration of a reproduction speed and the difficult separation of a reproduction speed from a HF signal component, and reducing laser noise. <P>SOLUTION: A laser beam pulse-driven by a high-frequency signal from a HF oscillator 11 is applied to an optical disk 1, and the output of a photodetector which receives a laser beam reflected from the optical disk is converted into an electrical pulse reproducing signal by a current amplifier 13. The pulse-reproducing signal is converted into a reproduction signal that is continuous in time by the combination of an A/D conversion circuit 50 and a D/A conversion circuit 51. <P>COPYRIGHT: (C)2008,JPO&INPIT |
