Patent ID: 7995450

Claim:
An optical element feeding device mounted on an optical pickup unit for moving an optical element in a direction of an optical axis for aberration correction, the optical element feeding device comprising: support means for supporting a movable member in which an optical element is arranged in such a manner as to be movable in the direction of the optical axis; a stepping motor having a rotating shaft to drive the movement of the movable member; a screw coaxially attached to the rotating shaft of the stepping motor, arranged in parallel to the optical axis of the optical element and rotated on the basis of a rotation of the rotating shaft of the stepping motor; a resin nut fitted on the lead screw, the resin nut being provided with a rotation preventing portion and being movable in an axial direction of the lead screw on the basis of the rotation of the lead screw; and a pressing member arranged to elastically press the movable member in the direction of the optical axis so as to bring the movable member into contact with the resin nut, wherein a part of an outer periphery of the resin nut is coupled to the movable member by an oscillation suppression material having a viscosity, sufficient to constantly suppress oscillation of the resin nut caused when the nut is moved by rotation of the lead screw to prevent fluctuation of the movable member, wherein said oscillation suppression material has a plastics accommodating characteristic and maintains sufficient viscosity during increased temperature to continue suppressing oscillation of the nut at said increased temperature.