Patent ID: 7359293

Claim:
An optical pickup device for data recording/reproduction on an optical disk with a cover layer formed on a signal recording layer, comprising: a light source; an object lens for focusing light from said light source onto said signal recording layer through said cover layer; a beam expander unit including a fixed portion and a movable portion, provided between said light source and said object lens, for converting light from said light source into any one of diffused light, converged light and collimated light and emits the light; and a mover for moving said movable portion in a direction of an optical axis by passing an electrical current through a drive coil contained in said movable portion provided in a magnetic field, wherein said beam expander unit further comprises a restorator for restoring said movable portion to a position before having been moved by said drive coil, and wherein said restorator includes two spiral leaf springs that are coplanar with arms thereof interleaved and that make no contact with each other, and said two spiral leaf springs are electrically connected with the both ends of said drive coil, respectively.