Patent ID: 7457221

Claim:
An optical disc recording/reproduction device comprising: an optical pickup having an objective lens for collecting light flux onto an optical disc and forming an optical spot, a photo-detector for detecting a light flux reflected from the optical disc, an actuator for moving the objective lens, and a spherical aberration corrector for correcting a spherical aberration of the objective lens; means for generating a reproduction signal and a tracking error signal serving as data from an output signal from the photo-detector of the optical pickup; spherical aberration corrector drive means for driving the spherical aberration corrector of the optical pickup; and actuator drive means for driving the actuator of the optical pickup; wherein the tracking error signal generation means is adapted to be able to at least generate the tracking error signal by a push-pull signal based on the push-pull method; the optical disc recording/reproduction device further comprising: first adjustment means for adjusting a spherical aberration correction amount in the spherical aberration corrector of the optical pickup and a focus offset amount of the objective lens according to the tracking error signal formed by the push- pull signal; second adjustment means after adjustment of the spherical aberration and the focus offset by the first adjustment means, for recording predetermined data on the optical disc and adjusting the spherical aberration correction amount in the spherical aberration corrector of the optical pickup and the focus offset amount of the objective lens according to the reproduction signal of the data recorded; and means for storing characteristics for the defocus amount and the spherical aberration correction amount relating to the amplitude of the tracking error signal formed by the push-pull signal, so that the characteristic is used for adjustments of the spherical aberration and the focus offset by the first and the second adjustment means.