Patent ID: 7680010

Claim:
A method for recording information on an optical recording medium, the method comprising pulse-modulating a laser beam into a pulse train including at least a leading write pulse at write power and a trailing cooling pulse at generally bottom power, and allowing the laser beam to irradiate a recording layer of a phase-change optical recording medium, thereby modulating the laser beam into a length of a record mark along a track of the recording layer, the length of the record mark being associated, for recording, with an integral multiple of T or nT, or a time length of write data, where T is a write channel clock cycle, a write wavelength of the laser beam is λ, a numerical aperture of an objective lens used for irradiation with the laser beam is NA, and a relative speed between the objective lens and the optical recording medium is L v , wherein: the method further comprises a step of inserting at least a set of a cooling pulse including a cooling pulse of a pulse time T cool immediately following the leading write pulse at generally bottom power and a write pulse at write power between the leading write pulse of a leading write pulse time T top and the trailing cooling pulse where T cool and T top satisfy that 0.16≦(L v ×T cool )/(λ/NA)≦0.30 and 0.06≦(L v ×T top )/(λ/NA)≦0.14.