Patent ID: 7219359

Claim:
An actuator used with an optical pickup, the actuator comprising: a lens holder having a plurality of installation holes supporting a plurality of objective lenses to record and/or reproduce data on optical discs having different recording densities; and a magnetic circuit which drives the lens holder in focusing and tracking directions, the magnetic circuit being divided into first magnetic circuits located at opposite sides of the lens holder to drive the objective lenses in the focusing direction, and second magnetic circuits located at opposite sides of the lens holder to drive the objective lenses in the tracking direction, wherein each of the first magnetic circuits comprises a focusing coil and a focusing magnet and each of the second magnetic circuits comprises a tracking coil and a tracking magnet; wherein the tracking magnets and the tracking coils of the second magnetic circuits are arranged closer to a center of the lens holder than the focusing coils and the focusing magnets of the first magnetic circuits.