Patent ID: 7643403
Filing Date: 2010-01-05
Classification: G11B

Abstract:
1. 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 the minute pattern thereon; a recording layer formed on the minute pattern; and a light transmission layer formed on the 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 minute pattern is 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 a phase of a high frequency portion and a phase of a low frequency portion are continuous at a border between the high frequency portion and the low frequency portion composing the frequency shift modulation.