Patent ID: 7791997
Filing Date: 2010-09-07
Classification: G11B

Abstract:
1. An information recording medium comprising: a first recording layer for recording and a second recording layer for recording, said first recording layer and said second recording layer arranged in this order as viewed from an irradiation side of the laser light, wherein said second recording layer has a predetermined area in which power calibration is performed to detect an optimum recording power of the laser light for recording, which is transmitted through said first recording layer, and said first recording layer has a facing area which faces the predetermined area, the facing area having embossed pits, and light transmittance of the facing area being same as that of a recorded area on said first recording layer, said first recording layer has a first predetermined area in which the power calibration is performed for said first recording layer, said second recording layer has an unrecorded area which faces the first predetermined area, said second recording layer has a second predetermined area in which the power calibration is performed for said second recording layer, said first recording layer has an unrecorded area which faces the second predetermined area, a radial position of the predetermined area, a radial position of the first predetermined area and a radial position of the second predetermined area are different from each other.