| 摘要 |
A recording medium, comprising gooves (1), lands (2) formed between the respective gooves (1), and land prepits (3) formed on the respective lands (2), wherein each of the land prepits (3) is formed so that a ratio between a voltage amplitude of a land prepit detection signal and an offset level of an RF signal is maximized. An optical system is provided comprising an objective which is adapted to form a light spot on a respective goove, the light spot having a diameter larger than the width of the groove, a photodetector which is adapted to receive light reflected from the recording medium and adapted to generate a photodetection signal; and an operation circuit which is adapted to generate the land prepit detection signal and the RF signal based on the photodetection signal. <IMAGE> |
