An objective lens driving apparatus includes a lens holder 1 that holds
an objective lens 2, and a stationary base 9 that supports the lens
holder 1 by a support shaft 3 parallel to an optical axis of the
objective lens 2. A stationary yoke 11 and the magnet 8 are
mounted to the stationary base 9. A focusing coil 4 and the tracking
coils 5a and 5b are mounted to the lens holder 1.
The interaction between the current in the focusing coil 4 and the magnetic
field caused by the magnet 8 generates an electromagnetic force that moves
the lens holder 1 along the support shaft 3. The interaction between
the current in the tracking coils 5a and 5b and the
magnetic field caused by the magnet 8 generates an electromagnetic force
that rotates the lens holder 1 about the support shaft 3.
