OPTICAL RECORDER, OPTICAL RECORDING METHOD AND COMPUTER READABLE RECORDING MEDIUM RECORDED WITH PROGRAM FOR MAKING COMPUTER EXECUTE ITS METHOD

摘要

PROBLEM TO BE SOLVED: To provide an optical recorder capable of obtaining a high quality optical disk either in a CLV system or CAV system while being suitable for the recording and rewriting of the information performed at the linear velocity of 4X CD linear velocity or faster. SOLUTION: As to the rotating phase transition type optical disk, a recording pulse train including at least a multipulse part mp wherein a high power signal and a low power signal are alternately and repeatedly generated with a specified duty ratio, and an erase signal Se, is used, and when the recording linear velocity is equal to 10X CD linear velocity or slower, the duty ratio Z of the multipulse part is determined by equation of 0.045X<=Z<=0.038+0.25 (X = writing reference linear velocity).