| 摘要 |
PURPOSE:To eliminate the influence of the inclination of a disc by obtaining the correction signal corresponding to the inclination of the disc from the tracking error signal of a pit-less part and correcting the tracking error signal in accordance with this correction signal. CONSTITUTION:The rugged signal of a disc 2 enters a two-split light detector 8. Both outputs from the detector 8 are inputted to a rugged signal reproducing part 9 and a differential tracking error extracting part 12, by which the rugged signal is reproduced and a tracking error signal is created. these signals are inputted to an extracting part 10 for the tracking error signal of a pit-less part, from which the tracking error signal of only the pit-less part is extracted. Further this signal is converted in a prescribed relation in a correcting and adjusting part 11. The converted signal is added to the output signal of the part 12 in an amplification part 13, and by the output thereof, a tracking actuator 14 is controlled. |
