Patent ID: 6970405

Claim:
A recording/reproducing apparatus for recording and/or reproducing information data by irradiating a light beam to a recording medium, and comprising: an optical pickup including an objective lens for converging said light beam, an actuator for operating said objective lens, an aberration correction element for correcting aberration caused in said reflected light beam, and a detector for generating a reading signal by receiving the reflected light beam from said recording medium; a servo control section for performing focus servo control by operating said actuator; an aberration correction driver for performing the aberration correction by operating said aberration correction element; a disturbance signal generator for generating a focus disturbance signal for wobbling a focusing position of said objective lens, and an aberration correction disturbance signal having a period different from that of said focus disturbance signal and wobbling an aberration correction amount of said aberration correction element; and a controller for adjusting said focusing position and said aberration correction amount on the basis of a change in a predetermined characteristic value of said reading signal when said focus disturbance signal and said aberration correction disturbance signal are simultaneously applied.