Patent ID: 7916590

Claim:
A method for optimizing recording pulse conditions, comprising the steps of: generating recording pulses using each of multiple sets of recording pulse conditions, each set of recording pulse conditions having portions of recording pulses which correspond to marks of two types or more, the portions in each set having different lengths or phases from lengths or phases of the portions of the recording pulses in the other sets of recording pulse conditions, and recording a specific mark-space pattern with each set of recording pulse conditions onto respective areas of tracks of a writable optical information recording medium based on the recording pulses; measuring an edge shift amount of a reproduction signal for each of the areas of the tracks on which the specific pattern is recorded with each of the multiple sets of recording pulse conditions by reproducing a signal from each of the areas; calculating a length shift or phase shift of a mark from the edge shift amount for each of the areas; and calculating compensation values for the recording pulse conditions according to a difference in lengths, based on the calculated length shifts, or a difference in phases, based on the calculated phase shifts, of the mark for each of the areas of the tracks on which the specific pattern is recorded with each of the multiple sets of the recording pulse conditions using an approximation that the difference in lengths or the difference in phases of the mark among the areas is proportional to the difference in the lengths or the difference in the phases of the portions of the recording pulses.