METHOD AND APPARATUS FOR READING FROM A DOMAIN EXPANSION RECORDING MEDIUM

摘要

The present invention relates to a method and an apparatus for reading information from a domain expansion magneto-optical recording medium, wherein the duty cycle of an external magnetic field is set so that the duration of the expanded domain in the read-out layer is longer than the duration of the domain collapse direction. A smaller bandwidth of the detection system can thus be allowed and the signal-to-noise ratio is improved. Furthermore, an additional level may be introduced for the external magnetic field between the expansion direction and the collapse direction so as to obtain an as short as possible expansion and collapse pulse. An improved resolution and SNR can thus be obtained.