Information recording media, a method for recording/reproducing information, an apparatus for recording/reproducing information
View Patent ↗An information recording medium includes a plurality of layers for recording or reproduction of information by irradiation, wherein each of the layers includes an emboss portion and wobble portion including wobbles of a first frequency and a second frequency that is different from the first frequency. The first frequency is constant in each of the plurality of layers, and a different signal is obtained from the wobbles of the first and second frequencies in each of the plurality of layers.
1. An information recording medium comprising:
a plurality of layers for recording or reproduction of information by irradiation;
wherein each of the layers includes an emboss portion and wobble portion including wobbles of a first frequency and a second frequency that is different from the first frequency;
wherein the first frequency is constant in each of the plurality of layers; and
wherein a different signal is obtained from the wobbles of the first and second frequencies in each of the plurality of layers.
2. The information recording medium according to claim 1 , wherein a difference between the first and second frequencies is different in each of the plurality of layers.
3. The information recording medium according to claim 2 , wherein the greater a distance between a light incidence side of the information recording medium and a predetermined layer of the plurality of layers, the larger the difference between the first and second frequencies in the predetermined layer.
4. The information recording medium according to claim 1 , wherein a sum of the first and second frequencies is different in each of the plurality of layers.
5. The information recording medium according to claim 1 , wherein the first frequency is used for generating a synchronizing signal.