Patent ID: 7382716
Filing Date: 2008-06-03
Classification: G11B

Abstract:
1. An information recording carrier having minute pattern including plural grooves formed to be substantially in parallel and adjacent to each other, comprising: a supporting body having the minute pattern; a recording layer formed on the minute pattern formed on the supporting body; and a light transmission layer formed on the recording layer, wherein the minute pattern is formed under a relation of P<λ/NA, where P represents a distance between centers of adjacent grooves, λ represents a wavelength of a laser beam, and NA represents a numerical aperture of an objective lens, wherein the plural grooves include at least a wobbling region, wherein said wobbling region records, as wobble, data modulated by phase shift modulation, wherein the wobbling region is comprised of a region subjected to wobbling recording by phase shift modulation and a region subjected to wobbling recording at a single frequency, wherein the thickness of light transmission layer is from 0.02 to 0.12 mm, wherein the laser beam has a wavelength λ of from 350 nm to 450 nm and is projected onto said recording layer through said light transmission layer, and wherein the objective lens has a numerical aperture NA of from 0.85 to 0.9.