Patent ID: 7106680

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: forming the recording mark by a multi-pulse sequence, which is increased by one pulse with an irradiation power Pw for every increase of 2T in the temporal length nT; and forming a recording strategy to control the multi-pulse sequence during said recording mark forming step so that: when n≧4, the fall of a first pulse of the multi-pulse sequence is synchronized with the basic clock; and when n is an odd number and n≧7, a period from the fall of the first pulse to the fall of a second pulse in the multi-pulse sequence is arranged to be greater than 2T and in synchronization with the basic clock, periods of pulses after the second pulse except for a last pulse of the multi-pulse sequence are arranged to be 2T, and a period from the fall of a second to last pulse to the fall of the last pulse, denoted as T 1 o, is set to T 1 o=(2+δ 1 o)T where 0<δ 1 o≦1, where δ 1 o denotes the length of pulses depending on the value of n.