| 摘要 |
In an optical recording medium including a grooved light-transparent substrate, a phase change recording layer, a dielectric layer and a reflective layer, recording is carried out by irradiating a laser beam to the recording layer through an objective lens in an optical system. The recording is carried out in a groove recording mode under the conditions: 0.48<=P<SUB>T</SUB>/(lambda/NA)<=0.74, AND P<SUB>T</SUB><=0.50 mum wherein lambda is a laser beam wavelength, NA is an objective lens numerical aperture, and P<SUB>T </SUB>is a track pitch, thereby forming a recorded mark having opposite ends extending out of the groove. This enables high density recording and increases the data transfer rate of a phase change optical recording medium.
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