| 摘要 |
<p>PROBLEM TO BE SOLVED: To quickly suppress oscillation even when oscillation caused by unnecessary resonance occurs in a servo system.SOLUTION: An audio reproduction device 1 having: an optical pickup device 10 for focusing and emitting a laser beam on and to an optical disk 2 at a predetermined tracking position; and a servo system for applying servo control to the focus position of the laser beam or the tracking position includes: an oscillation detection part 50 for detecting the oscillation of the servo system and the frequency of oscillation; and an adjustment part 51 for, on the basis of the level of the frequency of oscillation with respect to the gain cross point of the servo system, adjusting the servo gain or phase of the servo system.</p> |
