Patent ID: 7773478

Claim:
A recording method for a multi-layered optical recording medium including M phase change recording layers, with M≧2, the method comprising: recording a mark in a Kth one of said recording layers by using a laser to irradiate the Kth recording layer using a recording pulse train including a plurality of laser beam pulses, the recording pulse train for the Kth recording layer having a cycle of t (K) [T], where: the 1st recording layer is the recording layer closest the laser beam, the Mth recording layer is the recording layer furthest from the laser beam, T is a clock cycle; wherein the following relationship is satisfied: t (1) <t (M) , and the cycle of recording pulse train does not decrease from one recording layer to the next recording layer in the direction in which the laser beam irradiates, and wherein marks are recorded on the recording layers other than the recording layer disposed at the innermost side as viewed from the laser beam irradiation side, and the recording marks are formed by a recording pulse train being set such that cooling power levels Pc 1 , Pc 2 ,. . . , PcN (where N is an integer of 1 or more) are modulated between a bias power level Pb and a recording power level Pp and are set between an erasing power level Pe and at least one bias power level Pb of the bias power level Pb anterior to a leading pulse and the bias power level Pb posterior to a last pulse so as to satisfy the following relation: Pp>Pe>Pc1>Pc2 . . . >PcN>Pb.