Patent ID: 6636477
Filing Date: 2003-10-21
Classification: G11B

Abstract:
An information-recording medium in which information (recording mark) is recorded in response to a variation in atomic arrangement and/or variation of electronic state through radiation of energy beams moved relatively to each other in relative moving directions, wherein:there are provided a plurality of information recording tracks in parallel with said relative moving directions; there is provided a step between said information recording tracks; one or more types of information recording thin films are provided as recording layers; sides of the recording layers opposite to an energy beam incident side are provided with one or more types of heat sink control layers and a heat sink layer; a sum of film thickness of said one or more types of information recording thin films provided as said recording layers is equal to or less than said step between said information recording tracks; a sum of film thickness of said one or more types of heat sink control layers is equal to or more than said step between said information recording tracks; wherein said step between said information recording tracks is a step section between a groove section and adjacent land section; where each of adjacent said groove section and adjacent said land section is an information record track; where said information-recording medium is provided with a transparent substrate at said energy beam incident side, and said energy beam is a laser beam; and where a step depth between said groove section and said land section is &lgr;/(7n) or more and &lgr;/(6.2n) or less, where &lgr; denotes a laser wavelength of said laser beam and (n) denotes a refractive index of said transparent substrate at the wavelength &lgr;.