Patent ID: 7196978
Filing Date: 2007-03-27
Classification: G11B

Abstract:
1. An optical head having a two-axis actuator driving an objective lens in a focusing direction along a Z axis orthogonal to the surface of an optical disk and in a tracking direction along an X axis in the radial direction of the optical disk, comprising: a coil bobbin for supporting the objective lens, the optical axis of the objective lens being aligned with the Z axis, a focusing coil wound around the Z axis and disposed on the coil bobbin; a pair of tracking coils wound around the X axis and disposed on both ends of the coil bobbin in the X axis direction, supporting means for supporting the coil bobbin so that the coil bobbin is movable in the focusing direction and the tracking direction, two pairs of magnets disposed so that magnets in each pair are disposed opposingly on both ends of the corresponding tracking coils in the Y axis direction which is orthogonal to both the Z axis and the X axis, the surfaces of the magnets opposing the tracking coils are magnetized in the Y axis direction and have the same polarity, a magnetic circuit forming a closed magnetic path in which magnetic lines generated by each pair of magnets sandwiching the focusing coil intersect the tracking coils and the focusing coil, wherein the supporting means comprises a plurality of flat springs, and wherein the flat springs function as signal lines for supplying signals to the focusing coil and the tracking coils.