ACTUATOR FOR OPTICAL PICKUP

PURPOSE: An actuator for an optical pickup is provided to guarantee the desired tracking performance and make the actuator slim by magnetic circuits including magnets of which a polarization structure is improved, a single track coil, and a plurality of focus/tilt coils. CONSTITUTION: An actuator for an optical pickup includes a bobbin(15) movably mounted to a base(10) and stacked with an objective lens(14), supporting elements(16), each of which an end is fixed to side surfaces(15c,15d) of the bobbin to move with respect to the base, and the other end is fixed to a holder(12) provided at a side of the base, and a pair of magnetic circuits(30) facing both sides(15a,15b) of the bobbin and the base. The magnetic circuits respectively include a track coil(32) for driving the bobbin in the track direction, a plurality of focus/tilt coils(33-36) for driving the bobbin either focus or tilt direction, and magnets(31) facing the focus/tilt coils and the track coils and having a polarization structure for the focus or tilt direction driving and the track direction driving of the bobbin.