Patent ID: 7333404

Claim:
An actuator to be used in a mobile optical recording/reproducing apparatus, the actuator comprising: a holder; a movable member having an objective lens to focus an incident light; a support member positioned between the holder and the movable member, such that the movable member is movably supported with respect to the holder; and a magnetic driving unit, provided on a middle portion of the movable member and at an upper portion and/or a lower portion of the movable member, to drive the movable member in a track direction and a focus direction, wherein the magnetic driving unit comprises: a support plate having an upper plate and a lower plate, spaced apart from the movable member at a desired interval; a magnet to generate a magnetic field in a desired direction; and a coil member to drive the movable member using interaction between the magnet and the coil member; wherein one of the magnet and the coil member is provided at the support plate, and the other one is provided at the movable member in a position corresponding to the one of the magnet and the coil member, and wherein the lower plate, the movable member and the upper plate are arranged along the focus direction.