Patent ID: 7697381

Claim:
An object lens drive unit comprising: an object lens for focusing light on a recording surface of an optical disc; a lens holder for holding the object lens; a pair of first rod-shaped elastic support members for supporting the lens holder; at least two pair of second rod-shaped elastic support members that support the lens holder on the opposite side from the first rod-shaped elastic support members with respect to the tangential direction; a drive means for the lens holder, the drive means comprising: a focusing coil and a tracking coil for driving the lens holder in a direction towards or away from the optical disc and in a radial direction of the optical disc; a radial tilt coil and a tangential tilt coil for causing the lens holder to be inclined in a radial direction and a tangential direction of the optical disc; and a magnetic circuit; wherein the position at which the lens holder is supported by the first rod-shaped elastic support members in the focusing direction substantially coincides with the position of the center point of the tracking coil in the focusing direction; wherein the at least two pairs of second rod-shaped elastic support members have a smaller axial stiffness than the first rod-shaped elastic support members; and wherein the position at which one of the at least two pairs of the second rod-shaped elastic support members support the lens holder in the focusing direction and the position at which another of the at least two pairs of the second rod-shaped elastic support members supports the lens holder in the focusing direction are substantially symmetric with respect to the point at which the first rod-shaped elastic support members support the lens holder.