Patent ID: 7330405

Claim:
An objective lens driving device for an optical head, comprising: a lens holder that holds an objective lens, the lens holder having a front face, a back face, side faces and a lower face; and a base part on which the lens holder is provided; wherein the lens holder comprises: tracking coils formed of square type flat coils of the same size, one pair of the tracking coils arranged on a front face side of the lens holder and another pair of the tracking coils arranged on a back face side of the lens holder respectively in a track direction perpendicular to a focus direction with an interval therebetween and connected in series; a focusing coil that is wound around the front face, the back face and the side faces of the lens holder in a plane perpendicular to the focus direction; first and a second wires arranged on one side face of the lens holder to support the lens holder, and adapted to supply control currents to the tracking coils; third and a fourth wires arranged on another side face of the lens holder to support the lens holder, and adapted to supply control current to the focusing coil; and a pair of movable magnets for correcting a tilt angle, the pair of movable magnets disposed on the lower face of the lens holder at positions adjacent to both right and left ends thereof; wherein the base part comprises: a pair of fixed magnets arranged so as to be opposed to the tracking coils and the focusing coil of the lens holder in a direction perpendicular to the focus and track directions to thereby act thereon; a pair of right and left tilt angle correcting coils for correcting the tilt angle which are connected in series and arranged so as to be respectively opposed to the movable magnets to thereby act thereon; and power supply lines for supplying control currents to the tilt angle correcting coils; and wherein a driving amount in the track direction is controlled by the control currents supplied by way of the first wire and the second wire, a driving amount in the focus direction is controlled by the control currents supplied by way of the third wire and the fourth wire, and a driving amount in the tilt angle direction is controlled by the control currents supplied by way of the power supply lines.