Optical disk apparatus and servo control method

An optical disk apparatus comprising:

• an optical pickup which irradiates a recording surface of an optical disk with a light beam selectively set to one of a reproduction power and a recording power and receives reflected light from the recording surface;
• and
• a driving module which drives the optical pickup;
• wherein the driving module includes an error detector which detects a focusing servo error with respect to the recording surface from an output signal of the optical pickup and a focusing control module which performs focusing control over the optical pickup based on a focusing servo error signal obtained from the error detector, and
• the focusing control module is configured to temporarily set a focusing servo to an OFF state upon switching from a reproduction state to a recording state, measure an offset of the focusing servo error signal produced due to the switching, perform offset correction for the offset with respect to the focusing servo error signal, and restore the focusing servo to an ON state after the offset correction.

A servo control method of an optical disk apparatus which comprises an optical pickup which irradiates a recording surface of an optical disk with a light beam selectively set to one of a reproduction power and a recording power and receives reflected light from the recording surface, and a driving module which drives the optical pickup, wherein the driving module includes an error detector which detects a tracking servo error with respect to a recording track on the recording surface and a focusing servo error with respect to the recording surface from an output signal of the optical pickup, and a control module which performs at least one of tracking control and focusing control over the optical pickup based on each servo error signal obtained from the error detector, the method comprising:

• temporarily setting a servo to an OFF state upon switching from a reproduction state to a recording state;
• measuring an offset of each servo error signal caused due to the switching;
• performing offset correction for the offset with respect to each servo error signal;
• and
• restoring the servo to an ON state after the offset correction.