Patent ID: 8171506

Claim:
An optical-system driving device for recording information onto and playing back the same from an optical storage medium, comprising: a stationary unit having a rotation axis; a movable unit pivotable about the rotation axis; a pivotal movement device for pivotally moving the movable unit about the rotation axis, said pivotal movement device including at least one magnet opposing at least one coil; and a rotation-amount-limiting device for limiting an amount of rotation including at least one magnetic piece opposing at least one magnetizable portion, wherein the movable unit includes a holder having a plurality of optical devices that is able to focus a beam of light onto the optical storage medium, and a plurality of conductive elastic members for supporting the holder, the optical axis of each of the plurality of optical devices is substantially equidistant from the rotation axis, by pivotally moving the movable unit with the pivotal movement device, one of the optical devices for focusing the beam of light onto the optical storage medium is selected, and said at least one magnetizable portion is magnetized by said at least one magnet of said pivotal movement device to limit the amount of rotation of said movable unit.