| 摘要 |
An optical disk servo device capable of correcting spherical aberration occurring by thickness errors of a cover layer of an optical disk or disc while avoiding risks of influence by vibrations and shocks or else is disclosed. The device includes an optical head unit for writing or reading information to or from the optical disk, a tracking-servo unit, a lens for correction of spherical aberration, and a lens position detector for detecting a position change amount or displacement of the lens and for generating at its output a lens position detection signal, which is then subjected to negative feedback to the tracking-servo unit.
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