multi-layer informationsaufzeichnungsmedium, informationsaufzeichnungsvorrichtung and informationswiedergabevorrichtung

摘要

To shorten the time required for layer jump by enabling recording on each recording layer of a multilayer information recording medium with a signal quality equivalent to the signal quality in the single-layer information recording medium. In a multilayer information recording medium for use in an information recorder/reproducer capable of performing recording and reproducing operation on both of a single-layer information recording medium having one recording layer on one side, and a multilayer information recording medium having a plurality of recording layers on one side, guide grooves are formed at a track pitch set as a quadratic function of the substrate thickness (distance from the incident surface to the recording layer) in each recording layer of the multilayer information recording medium, and the guide grooves are formed to minimize the track pitch of the recording layer in the substrate thickness nearest to the substrate thickness of the single-layer information recording medium among the plurality of recording layers.