Patent ID: 7821912

Claim:
An information recording medium comprising: a substrate having a microscopic pattern, which includes a shape of continuous substance of approximately parallel grooves formed with a convex shaped section and a concave shaped section alternating on a surface of the substrate; a recording layer formed on the microscopic pattern; and a light transmitting layer having thickness of 0.05 mm to 0.12 mm formed on the recording layer, the microscopic pattern satisfies a relation of P≦λ/NA, wherein P is a pitch of the convex shaped section, λ is a wavelength of a reproducing light beam and NA is a numerical aperture of an objective lens, and further wherein the microscopic pattern includes a modulated address information formed on both side walls of the convex shaped section viewed from the light transmitting layer as a wobble, both the side walls being parallel to each other, and furthermore wherein a fluctuation amount of thickness of the light transmitting layer is ±0.002 mm.