Optical recording/reproducing apparatus

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 for wobbling a correcting amount of said aberration correction element;
• a calculator for obtaining a predetermined characteristic value of said reading signal while said focus disturbance signal and said aberration correction disturbance signal are simultaneously or alternately applied, to calculate each of changing values for said focusing position and said correcting amount on the basis of a change in the obtained characteristic value;
• and
• a controller for simultaneously or alternately changing said focusing position and said correcting amount in accordance with each of the changing values to control said predetermined characteristic value so as to be an optimum value.