Patent ID: 8046785

Claim:
An objective lens actuator, comprising: a lens holder for attaching an objective lens thereon, the lens holder having a box-like shape of a rectangular parallelepiped which is opened on a lower surface thereof; a piece of focusing coil, being wound along side surface of said lens holder around said objective lens; and three magnets, being disposed opposing to two surfaces each having a normal line perpendicular to both a focusing direction and a tracking direction, among four side surfaces of said lens holder; wherein said three magnets are aligned, continuously, along the tracking direction, differing in polarity thereof from one another, and a width of the magnets on both outsides is wider than a width of the magnet inside; and wherein among said three magnets, the width of the magnets on both outsides is 1.3 to 4.3 times wider than the width of the magnet inside.