Patent ID: 8284646

Claim:
An objective lens driving device, comprising: an objective lens; an objective lens holder that holds the objective lens; a plurality of elastic supporting members that support the objective lens holder; a tracking driving member configured to drive the objective lens holder in a tracking direction; a tilting correction member configured to tilt the objective lens holder with respect to an optical axis passing through the objective lens; a tracking control circuit configured to drive the tracking driving member using a tracking driving signal generated on the basis of a tracking error signal; and a tilting control circuit configured to drive the tilting correction member using the tracking driving signal generated in the tracking control circuit so as to cancel out a tilting force of the objective lens holder generated by the tracking driving member; wherein: the objective lens, the objective lens holder, the tracking driving member, and the tilting correction member are included in a movable portion, and a center of gravity of the movable portion is spaced apart from a center of a driving force of the tracking driving member, the tilting control circuit is configured to drive the tilting correction member using a signal yielded by multiplying the tracking driving signal by a specific scaling factor K and supply the tilting correction member with a current so as to cancel out the tilting force of the objective lens holder induced due to a positional displacement between the center of gravity of the movable portion and the center of the driving force of the tracking driving member, and the tilting control circuit includes a multiplier configured to multiply the tracking driving signal by the scaling factor K which is adjusted so that the tracking error signal has a maximum amplitude.