| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve recording signal quality, stability upon repetitive overwriting, reliability and versatility. <P>SOLUTION: Upon PWM recording, a recorded wave when recording and rewriting 0 signal having a signal width nT after modulation is made a continuous wave of e, and a recording pulse train when recording and rewriting 1 signal having the signal width nT after modulation is made fp having duration x and value a, mp where value b and value c having total time of T alternately repeat n-n' times at a duty ratio, and op having duration z and value d, x, y and z are set so as to satisfy 0.5T≤x≤2T, 0.4≤y≤0.6, 0.5T≤x≤1T, n' is a positive integer satisfying n'≤n, and a, b, c, d and e are set to satisfy (a, c)>e>(b, d). <P>COPYRIGHT: (C)2007,JPO&INPIT |
