| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical disk drive which can maintain the coherency of blue light beams Lb1, Lb2, and to provide an optical information recording method. <P>SOLUTION: The optical disk drive 20 detects, as the mark change TA, the change amount of the target mark position fluctuating as a tilt develops on the optical disk 100. The optical disk drive 20 further corrects the relation of the light path lengths of the blue light beams Lb1, Lb2 when the first and second objective lenses 35, 74 move corresponding to the mark change amount TA, by adjusting the light path length of at least one of the blue light beams Lb1, Lb2 corresponding to the mark change amount TA, and suppresses the difference of the light path lengths of the blue light beams Lb1, Lb2 down to the coherent length or shorter. <P>COPYRIGHT: (C)2009,JPO&INPIT |
