Patent ID: 7636296

Claim:
An information recording carrier having minute pattern including plural grooves or lands formed to be substantially in parallel and adjacent each other, comprising: a supporting body having a first minute pattern thereon; a first recording layer formed on the first minute pattern; a first light transmission layer formed on the first recording layer and having a second minute pattern on a side opposite to the first recording layer; a second recording layer formed on the second minute pattern; and a second light transmission layer formed on the second recording layer, wherein when a pitch of each groove or land is P, a wavelength of a laser beam is λ and a numerical aperture of an objective lens is NA, the first and second minute patterns are formed under a relation of P<λ/NA; wherein the plural grooves or lands include at least a wobbling region and data is recorded wobblingly in the wobbling region by frequency shift modulation; and wherein digital recording using the frequency shift modulation is carried out by frequency shift modulation in which with a predetermined frequency having either of 1-100 waves as a channel bit, the frequency is changed over for each channel bit.