Optical pickup apparatus and controlling method thereof

A method of controlling an optical pickup apparatus, the optical pickup apparatus comprising an objective lens that focuses light on an optical recording medium, and an actuator that drives the objective lens in a direction of an optical axis of the objective lens toward or away from the optical recording medium in response to an input voltage applied to the actuator, the method comprising:

• sensing a distance the actuator moves according to time or the input voltage applied to the actuator;
• calculating an input voltage to be applied to the actuator that compensates for a hysteresis phenomenon that occurs during movement of the actuator based on the distance sensed by the actuator driven distance sensor;
• and
• controlling operation of the actuator according to the input voltage calculated by the input voltage calculator.

An optical pickup apparatus comprising:

• an objective lens that focuses light on an optical recording medium;
• an actuator that drives the objective lens toward or away from the optical recording medium at a speed determined by an input voltage applied to the actuator;
• and
• a controller that applies a non-linear input voltage to the actuator to cause the actuator to drive the objective lens toward or away from the optical recording medium at a constant speed.