Patent ID: 7062775

Claim:
An actuator for an optical pickup, comprising two magnets each having a magnetization pattern comprising two different pole areas adjacent with each other, wherein at a corner part defined by two line segments constituting a boundary line of the two pole areas, the pole area inside the corner part has a projection area which projects in the direction of the pole area outside the corner part; a lens holder having an objective lens and two coil substrates mounted on its side surface; and a holding device for holding the lens holder movably between the magnets such that the two coil substrates face each of the two magnets, wherein the coil substrates have a focus coil and two tracking coils, and wherein the boundary line of the two pole areas has three straight line parts and two corner parts defined by the three straight line parts such that the lens holder is held by the holding device such that one of the three straight line parts faces the focus coil and the other two of the three straight line parts face each of the two tracking coils.