Patent ID: 7006307

Claim:
An optical pickup actuator in an optical pickup system having a base with a holder, comprising: a bobbin in which an objective lens is mounted, and disposed over the base; support members having first ends fixed on sides of the bobbin and second ends fixed to the holder disposed on a portion of the base to allow the bobbin to move with respect to the base; and a pair of magnetic circuits which are installed on two sides of the bobbin and on the base, wherein the magnetic circuit comprises: a tracking coil interacting with a magnet to generate a first force moving the bobbin in a tracking direction, a plurality of focusing/tilting coils interacting with the magnet to generate a second force and a third force moving the bobbin in a focusing direction and a tilting direction having a focusing component respectively, wherein the magnet faces the focusing/tilting coils and the tracking coil and has a polarized structure and comprises: first and second magnet parts that are co-linear and have opposite polarization arrangements and the tracking coil ranging over the first and the second magnet parts, and third and fourth magnet parts that are partially enclosed by the first and the second magnet parts and have opposite polarization arrangements to those of the first and the second magnet parts and are respectively located in a middle portion of the first and the second magnet parts in the focusing direction, wherein the focusing/tilting coils comprise: a first focusing/tilting coil ranging over the first and the third magnet parts comprising a pair of sub-first focusing/tilting coils that range over the first and the third magnet parts to be disposed in the focusing direction, and a second focusing/tilting coil that ranges over the second and the fourth magnet parts comprising a pair of sub-second focusing/tilting coils that range over the second and the fourth magnet parts to be disposed in the focusing direction.