Patent ID: 6643073
Filing Date: 2003-11-04
Classification: G02B,G11B

Abstract:
An objective lens drive comprising:an objective lens holding member arranged to hold an objective lens so as to define an optical axis; a focusing coil wound around a peripheral part of said objective lens holding member, said a focusing coil being operable to generate a driving force in a focusing direction parallel to the optical axis; a tracking coil wound around a peripheral part of said objective lens holding member, said tracking coil being operable to generate a driving force in a tracking direction perpendicular to the optical axis; a relay holding member; a fixing part; four first metal wires arranged so that a first end of each of said first metal wires is fixed to said objective lens holding member and a second end of each of said first metal wires is fixed to said relay holding member; four second metal wires arranged so that a first end of each of said second metal wires is fixed to said relay holding member and a second end of each of said second metal wires is fixed to said fixing part; magnetic circuit members arranged in said fixing part, said magnetic circuit members being operable to form a magnetic field to generate a driving force based on the Lorenzo force by supplying current to said focusing coil and said tracking coil through said first metal wires and said second metal wires, wherein said objective lens holding member is supported by said relay holding member so as to be movable in accordance with an elastic deformation of said first metal wires, and said relay holding member is supported by said fixing part so as to be movable in accordance with an elastic deformation of said second metal wires.