REPRODUCING DEVICE FOR OPTICAL INFORMATION RECORDING MEDIUM, AND OPTICAL INFORMATION RECORDING MEDIUM

摘要

A reproducing device (1) for optical information recording medium is provided for reproducing information stored in a super resolution optical information recording medium (100a) which includes a recording mark shorter than a resolution limit of an optical system and has information recorded thereon by arranging a plurality of recording marks by a random pattern system. The reproducing device performs test read for measuring indexes relating to reproduction qualities of the super resolution optical information recording medium (100a) by irradiating the recording surface of the super resolution optical information recording medium (100a) with laser beams, while changing reproducing laser power from a prescribed initial value, and based on the measured indexes, sets the reproducing laser power. Since the reproducing laser power for reproducing information recorded on the super resolution optical information recording medium (100a) is determined based on the results of the test read, excellent reproduction qualities can be obtained.