Objective lens actuator

An objective lens actuator, comprising:

• a ferromagnetic yoke which is including a cap having four inner yokes and having an opening;
• an objective lens holder which is movably located on the ferromagnetic yoke and which has an objective lens holding port for holding an objective lens, and four second openings which are located on the two opposite sides of the objective lens holder each two that correspond to each other, and which are allowing the four inner yokes to pass through;
• two tracking coils which are located on the other two opposite sides of the objective lens holder and four focusing coils which are located on the periphery of the second openings each;
• a magnetic element set including a horizontal magnetic element and a vertical magnetic element, the horizontal magnetic element being located on the ferromagnetic yoke corresponding to the focusing coils to generate a magnetic flux orthogonal to the optical axis of the objective lens, the vertical magnetic element being located on the ferromagnetic yoke corresponding to the tracking coils to generate a magnetic flux parallel to the optical axis of the objective lens;
• a suspension wire set which is connecting to the objective lens holder, the tracking coils, and the focusing coils to hang the objective lens holder and to channel current to the tracking coils and the focusing coils;
• a damper holder which is located on the ferromagnetic yoke to allow the suspension wire set to pass through;
• and
• a printed circuit board which is located on the damper holder and which is coupled with the suspension wire set to provide the current to the tracking coils and the focusing coils to drive the objective lens holder.