Patent ID: 8243566
Filing Date: 2012-08-14
Classification: G11B

Abstract:
1. An optical disk recording and/or reproducing apparatus that uses an optical disk as a recording medium, and has an optical pickup that records and reproduces a signal into/from the recording medium, the optical pickup comprising: a laser diode that generates laser light for performing the recording and reproducing; an objective lens for irradiating the laser light from the laser diode onto the recording medium, and condensing reflected light from the recording medium; an actuator that is mounted with the objective lens, and performs at least focus adjustment of the objective lens, tracking adjustment of the objective lens to a recording track of the recording medium, and tilt adjustment for adjusting tilt of the objective lens for facing the recording medium; a spherical aberration correction element for correcting spherical aberration of the objective lens; a detector that detects laser light condensed by the objective lens and converts the light into an electric signal; and a temperature sensor that detects internal temperature of the optical pickup, wherein the optical disk recording/reproducing apparatus comprises: wherein the spherical-aberration-correction drive signal generation module measures amount of temperature rise of the objective lens with respect to the internal temperature detected by the temperature sensor based on the signal variation measured by the signal variation measurement module, and generates the spherical-aberration-correction drive signal in the case that change in temperature as the sum of the amount of temperature rise and the internal temperature is larger than a predetermined value.