Tilting movement optical pickup actuator and optical recording and/or reproducing apparatus using the same and method

An optical recording and/or reproducing apparatus for recording and/or reproducing information from an optical information storage medium, comprising:

• an optical pickup, wherein the optical pickup comprises:
• an actuator to actuate an objective lens movable in a radial direction of the optical information storage medium to record information on and/or reproduce information from the optical information storage medium;
• and
• a controller to control focusing and tracking servo operations of the optical pickup,
• wherein the actuator comprises:
• a bobbin holding the objective lens;
• a suspension having one end fixed on a side of the bobbin and another end fixed to a holder positioned on a portion of a base to allow the bobbin to be movable with respect to the base;
• and
• a magnetic circuit comprising:
• a pair of unipolar magnets positioned on the base to face opposing sides of the bobbin,
• a focusing coil wound around the bobbin,
• a pair of tracking coils wound opposite one another and next to the objective lens in a radial direction to cross over the focusing coil and the bobbin to interact with the unipolar magnets to generate an electromagnetic force to control a tracking movement, and
• a plurality of tilting coils positioned in an upper portion of the bobbin and/or in a lower portion of the bobbin to with the unipolar magnets to generate an electromagnetic force to control a tilting movement when a central axis of the objective lens is disposed in an upward direction and a downward direction, the upward direction closer to the optical information storage medium.