Patent ID: 7453784

Claim:
An information recording method for recording information on an optical information recording medium according to a mark length recording scheme in which a temporal length of a recording mark is represented as nT where n denotes a natural number and T denotes a basic clock period, said method comprising: a recording mark forming step including forming a first recording mark corresponding to a temporal length of n 1 T when n=n 1 =2m (where m denotes a natural number greater than or equal to two), and forming a second recording mark corresponding to a temporal length of n 2 T when n=n 2 =2m+1, the first recording mark and the second recording mark being formed by a multi-pulse sequence including m pulses having an irradiation power of Pw; and a recording strategy step including using a recording strategy to control the multi-pulse sequence during said recording mark forming step, the recording strategy involving setting an irradiation time of an i th pulse of the multi-pulse sequence (where i denotes a natural number within a range of one through (m−1)), which irradiation time is denoted as T on (n, i), to T on (n, i)=constant T mp and T on (n 1 , i)=T on (n 2 , i) when n≧4; wherein when n=n 2 , the multi-pulse sequence is controlled such that at least one irradiation period of the irradiation power Pw is greater than 2T, at least one inter-pulse time width between the pulses having the irradiation power Pw when n=n 1 differs from at least one inter-pulse time width between the pulses having the irradiation power Pw when n=n 2 , and when differing scanning velocities v=v L and v=v H are used in recording (where v L <v H ), basic clock periods for the scanning velocities v L and v H are denoted as T(v)=T(v L ) and T(v)=T(v H ), respectively, and a constant line density function v L ×T(v L )=V H ×T(v H ) is satisfied, an irradiation time upon recording at the scanning velocity v L , denoted as T mp (v L ), satisfy conditions T mp (v H )<T mp (v L ) and T mp (v H )/T(v H )>T mp (v L )/T(v L ).