| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve the problem that improvement of recording signal quality and stability at the time of repeating overwrite and improvement of reliability and versatility can not be attained. <P>SOLUTION: When recording is performed according to the PWM recording system, a recording wave at the time of recording and rewriting a 0 signal having a signal width nT (T: Clock time) after modulation is a continuous wave at a power level e, a recording pulse array at the time of recording and rewriting a 1 signal having a signal width nT after modulation comprises a pulse section fp having a time width x and a power level a, a multi-pulse section mp in which a low level pulse at a power level b and a high power pulse at a power level c having a time width T in total alternately appear (n-n') times in all with a duty ratio y, and a pulse section op having a time width z and a power level d, and x, y, z are values satisfying the conditions of 0.5T≤x≤2T, 0.4≤y≤0.6 and 0.5T≤z≤1T, n' is a positive integer which is equal to or smaller than n, and the condition of (a and c)>e>(b and d) is satisfied. <P>COPYRIGHT: (C)2007,JPO&INPIT |
