Magnetic restoring device of an actuator

A magnetic restoring device of an actuator acting as an objective lens driving device in an optical pickup comprising:

• a lens holder having a support journal for supporting the objective lens;
• a voice coil motor including a base, a focusing coil provided on the lens holder, a tracking coil provided on the lens holder, and a plurality of magnets provided on the base such that an electromagnetic effect is formed when a current is made to flow through the focusing and tracking coils respectively which being exposed to an influence of a magnetic field of one of the corresponding magnetized magnets, thereby moving the lens holder along the support journal to effect a focusing operation for the optical pickup, and oscillating the lens holder along the support journal to effect a tracking operation for the optical pickup;
• two magnetic inductive members for generating a magnetic restoring effect in cooperation with the corresponding magnetized magnet such that the lens holder is held at a neutral position after a predetermined movement;
• and
• two yokes for causing the magnetic inductive members provided between the magnets and the yokes to form a magnetic circuit by the magnetized magnet and one of the corresponding yokes, one arc-shaped surface is formed on each of the magnets in a focusing direction, and an other arc-shaped surface is formed on each of the yokes in a tracking direction.