Patent ID: 7933183

Claim:
An apparatus for writing optical information to an optical recording medium by forming a line of marks and spaces on the recording medium by generating writing pulse light according to a predetermined writing strategy and projecting the writing pulse light onto the optical recording medium, the apparatus comprising: a reproducing signal generation unit configured to read information from the optical recording medium according to a reference writing strategy and generate a reproducing signal according to the marks and spaces; a clock generation unit configured to generate a clock based on the reproducing signal; a detection unit configured to detect leading/trailing edge timing at leading/trailing edge positions of respective marks of the reproducing signal where the reproducing signal varies in level and corresponding variations of the clock generated by the clock generation unit; a calculation unit configured to calculate an element jitter and an element average position of elements classified according to combinations of lengths of the marks and the spaces based on the variations of the clock; and a correction unit configured to compose an evaluation function based on the element jitter, the element average position, and a writing strategy, and optimally correct the writing strategy using the evaluation function, wherein the correction unit corrects the reference writing strategy by using a writing strategy correction value to obtain the predetermined writing strategy.