Optical recording method and optical recording medium

Abstract

An optical recording method for recording mark length-modulated information on a recording medium by using a plurality of recording mark lengths. The optical recording method comprises the steps of: when a time length of one recording mark is denoted nT (T is a reference clock period equal to or less than 25 ns, and n is a natural number equal to or more than 2), (i) dividing the time length of the recording mark nT into η1T, α1T, β1T, α2T, β2T, . . . , αiT, βiT, . . . , αmT, βmT, η2T in that order (m is a pulse division number; Σt(αi+βi)+η1+η2=n; αi (1≦i≦m) is a real number>0; βi (1≦i≦m−1) is a real number>0; βm is a real number≧0; and η1 is a real number of −2≦η1≦2 and η2 is a real number of −2≦η2≦2); radiating recording light with a recording power Pwi in a time duration of αiT (1≦i≦m), and radiating recording light with a bias power Pbi in a time duration of βiT (1≦i≦m), the bias power being Pbi<Pwi and Pbi<Pwi+1; and (ii) changing m, α1, β1, η1, η2, Pwi and Pbi according to n of the time length nT of the recording mark; wherein the pulse division number m is 2 or more for the time duration of at least one recording mark and meets n/m≧1.25 for the time length of all the recording marks.

Dependencies are inferred from the claim text.