Patent ID: 7646698
Filing Date: 2010-01-12
Classification: G11B

Abstract:
1. A method for producing an information recording medium-comprising a first recording layer and a second recording layer that is further from a laser-beam incidence plane than the first recording layer, such that (i) each of the first and second recording layers comprises a land track and a groove track that is closer to an incident laser beam than the land track, (ii) information is recorded to a recording track of each of the first and second recording layers, the recording track of each respective first recording layer and second recording layer being only one of the land track and the groove track, and (iii) the recording track to which the information is recorded has a wobble formed thereon to which address information is added by MSK (Minimum Shift Keying) modulation and HMW (Harmonic Modulated Wave) modulation to a reference frequency signal of the wobble, the method for producing the information recording medium comprising: forming the wobble on the first recording layer, such that a physical direction toward which a first wobble deviation starts when the groove track is selected as the recording track of the first recording layer is a mirror reverse of a physical direction toward which the first wobble deviation starts when the land track is selected as the recording track of the first recording layer, and forming the wobble on the second recording layer, such that a physical direction toward which a first wobble deviation starts when the groove track is selected as the recording track of the second recording layer is a mirror reverse of a physical direction toward which the first wobble deviation starts when the land track is selected as the recording track of the second recording layer.