Patent ID: 8228767

Claim:
An information recording medium comprising: a substrate having a microscopic pattern, having a continuous shape of approximately parallel grooves formed with alternating groove and land sections; a recording layer formed on the microscopic pattern; and a light transmission layer formed on the recording layer, wherein the microscopic pattern is formed so as to satisfy a relation of P<λ/NA and a thickness of the light transmission layer is within a range of 0.07 to 0.12 mm, wherein P is a pitch of the groove section or the land section, λ is a wavelength of reproducing light beam and NA is a numerical aperture of an objective lens; and wherein the land section is wobbled in the radial direction and having a wobbled shape corresponding to a signal to be recorded on the land section resulting from the modulation of a phase modulated wave that is further modulated by a single frequency wave, the single frequency wave having a frequency of integral multiples or one over integral multiples of a frequency of the phase modulated wave, and wherein the frequency of the single frequency wave is different from that of the phase modulated wave, and further wherein the signal to be recorded on the land section is a recording strategy information utilized for recording the information recording medium.