Patent ID: 7197005

Claim:
An optical recording method for recording information in an optical recording medium comprising a grooved light-transparent substrate including grooves and lands and a phase change recording layer thereon, by irradiating a laser beam thereto through an objective lens in an optical system, wherein the recording is carried out in a groove recording mode, in which only the grooves serve as a recording track, under the conditions: 0.48≦P T /(λ/NA)≦0.74 and P T ≦0.50 μm, provided that the laser beam used for recording has a wavelength λ, the objective lens has a numerical aperture NA, and recording tracks are arranged at a pitch P T , wherein the grooves are located relatively closer to a plane through which the laser beam enters than the lands, wherein said optical recording medium includes the recording layer, a dielectric layer, and a reflective layer stacked on the light-transparent substrate in the described order, and wherein the reflective layer has a thermal conductivity of at least 100 W/mK, and the dielectric layer has a thermal conductivity of at least 1 W/mK.