| 摘要 |
An aberration correction apparatus includes an optical pickup having a liquid crystal panel which gives a phase difference to a light beam emitted from a light source unit and irradiated onto a recording medium and corrects an aberration occurring to the light beam by a tilt of the recording medium, and a control unit which applies, to the liquid crystal panel, a correction voltage correspondent to an amount of the aberration in reference to a bias voltage. The bias voltage is set for each of the recording mediums so that the correction voltage applied for correcting the aberration of the same amount caused by the disc tilt becomes equal for different kinds of recording mediums. Namely, even when the plural kinds of recording mediums are used, if the disc tilt angles are same, the aberration can be corrected by applying the same correction voltage.
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