Patent ID: 8111593

Claim:
An objective lens drive comprising: a light-collecting unit for collecting a light beam; a holding unit having a reference plane defined thereon so as to be perpendicular to a recording medium for recording information, for holding the light-collecting unit; a first coil held by the holding unit, for moving the holding unit so that the light beam collected by the light-collecting unit is focused on the recording medium, the first coil being wound around an axis extending in a first direction perpendicular to the recording medium; two second coils held by the holding unit, for moving the holding unit so that a focal point of the light beam collected by the light-collecting unit follows a track formed in the recording medium, each of the two second coils being wound around an axis extending in a second direction parallel to the recording medium and perpendicular to the reference plane defined on the holding unit; two third coils held by the holding unit, for tilting the holding unit so as to tilt the light-collecting unit in accordance with a tilt of the recording medium, each of the two third coils being wound around an axis extending in said second direction; a supporting unit for movably supporting the holding unit; two magnets for allowing the first coil, the two second coils, and the two third coils to be driven; and a base for supporting the supporting unit and the two magnets, wherein the two second coils are arranged so as to be rotationally symmetrical to each other around an axis of symmetry extending in the second direction, but are not plane symmetrical to each other, the two third coils are arranged so as to be rotationally symmetrical to each other around said axis of symmetry, but are not plane symmetrical to each other, and the two second coils and the two third coils are disposed so that among planes defined by a wound wire of the respective coils, a plane perpendicular to said axis of symmetry is parallel to the reference plane defined on the holding unit at a predetermined reference distance or less.