Patent ID: 7440390
Filing Date: 2008-10-21
Classification: G11B

Abstract:
1. An information recording carrier having minute pattern including plural grooves formed to be substantially in parallel and adjacent 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 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, wherein the objective lens has a numerical aperture NA of from 0.85 to 0.9, and wherein said recording layer is composed of at least a phase change material.