| 摘要 |
PURPOSE:To improve the C/N by increasing the relative speed between a recording medium and a head at the reproduction more than that at recording. CONSTITUTION:The relative speed between the optical recording medium and the optical head is increased and a signal is reproduced more than the relative speed between the optical recording medium and the recording head at the recording of the information. A reproduced light with a large output is used without increasing the temperature of the recording medium by the high speed drive of the discat the reproduction. Further, the frequency of the reproducing signal is shifted to a frequency band with a low noise level, resulting in increasing the C/N. |
