Reading method for magneto-optical recording disc, magneto- optical recording disc driving device and magneto-optical recording medium

摘要

The invention provides a method which can be performed on the same device with application of a modulated magnetic field to read a magneto- optical recording disk through a series of processes involving "copy of recorded magnetic domains→enlargement of copied magnetic domains. fwdarw.reproduction of copied magnetic domains→size reduction and disappearance of copied magnetic domains", and to read an ordinary magneto-optical recording medium. For reading information recorded on the first magneto-optical recording disk, the first magneto- optical recording disk is irradiated with a laser beam having a first reading power, and the alternating magnetic field is then applied thereto after synchronization by which the alternating magnetic field is applied thereto at a recorded mark position. For reading information recorded on the second magneto-optical recording disk, the second magneto-optical recording disk is irradiated with a second laser beam.