Patent ID: 7305688

Claim:
An optical pickup actuator for use with an objective lens on a base, comprising: 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 the base to allow the bobbin to be movable with respect to the base; 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 and which interact 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 an optical recording medium; and a pair of reels formed on the bobbin to directly wind the tracking coils and/or the tilting coils, and the tracking coils and/or the tilting coils are directly wound around the reels on the bobbin.