| 摘要 |
PROBLEM TO BE SOLVED: To obtain stable focus servo performance both at access and reproduction. SOLUTION: An optical disk device for focusing the irradiated light beam on the optical disk in accordance with a focus error signal is provided with: a pickup for emitting the light beam to the optical disk and detecting the reflected light; a focus error signal detecting part for detecting a noise mixed focus error signal where a groove traversing noise and the focus error signal is superimposed on the basis of the reflected light; a pseudo groove traversing noise producing part for extracting the groove traversing noise from the noise mixed focus error signal and generating the pseudo groove traversing noise having the same frequency and substantially the same amplitude as those of the groove traversing noise and also being synchronized with the groove traversing noise; and a noise cancel part for outputting the focus error signal by inverting the phase of the pseudo groove traversing noise and adding it to the noise mixed focus error signal.
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