Optical pick-up, aberration correcting method, optical pickup program, information recording device and method, information recording program, information reproducing device and method, information reproducing program, and information recording medium

摘要

The invention is to provide an optical pickup capable of performing a track search operation accurately by reducing noise occurring in a focus servo system during the track search operation and also accurately recording/reproducing information to/from an optical disk.;An optical pickup PU for emitting a light beam B to an optical disk DK in which recording tracks having a land/groove structure are formed and receiving reflection light of the emitted light beam B, has: a liquid crystal panel 3 for correcting astigmatism included in light beam B by a cause peculiar to an optical system as a component of the optical pickup PU in a state where tracking servo is on, and correcting the astigmatism and a fundamental track crossing noise in a state where the tracking servo is off, and a liquid crystal panel control unit 8 for operating a liquid crystal panel 3 while making a switch in accordance with the state of the tracking servo.