Optical head unit for optical disk apparatus having both focus control and track control function

An optical head unit used for an optical disk apparatus, the optical head unit comprising:

• an object lens assembly for focusing a laser beam from a light source on an optical disk;
• an actuator movable at least in a focus control direction;
• a carriage for supporting the actuator, the carriage being movable in a track control direction;
• and
• a slider which is attached to the carriage and capable of adjusting a posture thereof in relation to a surface of the optical disk;
• wherein the object lens assembly comprises a first lens supported by the slider, and a second lens supported by the actuator;
• and
• wherein the actuator is a two-dimensional device movable in the focus control direction and the track control direction relative to the slider.