Patent ID: 7990658

Claim:
A voice coil motor for a disk drive comprising: a permanent magnet; a voice coil adapted to move in an arc proximate to the permanent magnet; a top plate positioned above the voice coil, the top plate having a first plate portion and a second plate portion at opposite sides of a symmetry axis of the arc; and a bottom plate positioned below the voice coil, the bottom plate having a first plate portion and a second plate portion at opposite sides of the symmetry axis of the arc; wherein the first plate portion of the top plate and the second plate portion of the bottom plate are at opposite sides of the symmetry axis of the arc; wherein the permanent magnet has two halves that are magnetized in opposite direction, the two halves of the permanent magnet are split into a right half magnet portion and a left half magnet portion, the right half magnet portion is attached to the first plate portion of the top plate, and the left half magnet portion is attached to the second plate portion of the bottom plate, wherein a first magnetic conductive plate is attached to the left half magnet portion and the first plate portion of the bottom plate.