Patent ID: 7417930

Claim:
An optical recording method of recording information to a phase change optical recording medium utilizing change in optical constant caused by reversible phase change between a crystalline phase and an amorphous phase by controlling power to be applied to the recording medium with three values of peak power, erase power and bias power in a recordable range between a minimum linear velocity and a maximum linear velocity, with alternate application of the peak power and bias power in a pulse manner and with changing the pulse application interval continuously from an inner circumferential part through an outer circumferential part of the recording medium with an interval proportional to a window width Tw and a fixed interval, comprising the step of: a) starting a top peak power application interval with a delay from a data input pulse signal starting time for a target mark length nTw, where n denotes an integer in a range between 3 and 14, with changing the delay at k/16 times with respect to the window width Tw with changing the same for each linear velocity, where k denotes an integer.