OBJECTIVE LENS DRIVING DEVICE AND OPTICAL DISC APPARATUS USING THE SAME

摘要

An objective lens driving device that includes a plurality of objective lenses for converging an optical beam onto an optical disc. The driving device includes a focusing coil for driving the objective lens in an optical axis direction; tracking coils for driving the objective lens in a radial direction of the optical disc; a lens holder for holding the objective lens, focusing and tracking coils; a sliding shaft for guiding the lens holder; a magnetic circuit where the focusing and tracking coil are inserted in a magnetic gap and a magnetic substance provided on the lens holder (outside of the magnetic gap). The magnetic circuit attracts the substance by leakage magnetic flux such that the position of the objective lens in the tracking direction is controlled.