Patent ID: 7167431
Filing Date: 2007-01-23
Classification: G11B

Abstract:
1. An information recording method for recording information in a rewritable optical recording medium having at least a first information recording layer and a second information recording layer, each formed of a phase change material where information is recorded by projecting a laser beam onto the optical recording medium via a light incidence plane and forming thereon a plurality of recording marks selected from a group consisting of several types of recording marks with different lengths each corresponding to an integral multiple of a clock cycle T, the first information recording layer being located on the side of the light incidence plane with respect to the second information recording layer, the information recording method comprising a step of setting the number of pulses of the laser beam to be projected onto the first information recording layer when a recording mark other than a recording mark having a length of 2T among the several types of recording marks is formed therein to be smaller than the number of pulses of the laser beam to be projected onto the second information recording layer when the recording mark other than a recording mark having a length of 2T is formed therein.