Patent ID: 7697390

Claim:
An information recording medium comprising: a first recording layer in which a spiral or concentric first track is formed to record a record information; and a second recording layer which is irradiated with laser light through said first recording layer and in which a spiral or concentric second track is formed, the second track sharing a rotation center with the first track, wherein said first recording layer has a first point represented by a first address, and said second recording layer has a second point (i) which is represented by a second address corresponding to the first address and (ii) which can be defined on the basis of a predetermined position relationship with respect to the first point, wherein the predetermined position relationship is set so as to include at least one of (i) a dimensional error held by each of said first recording layer and said second recording layer, (ii) an eccentric amount caused by a pasting error in said first recording layer and said second recording layer, and (iii) a radius of transmitted light which indicates a radius of an area formed on said first recording layer in which the laser light is irradiated to penetrate said first recording layer but not to focus on said first recording layer when the laser light is irradiated to focus on said second recording layer.