Patent ID: 7251819

Claim:
An optical pickup device comprising: an objective lens holder comprising: a first tracking coil and a second tracking coil, each tracking coil comprising at least one vertical portion; an axis of rotation about which said first and second tracking coils rotate; and an objective lens; and a first magnet and a second magnet generating a first magnetic field and a second magnetic field, respectively, and defining a centerline which passes through a center of each of the first magnet and the second magnet, through the axis of rotation, and through one of the first tracking coil and the second tracking coil; wherein said first and second tracking coils are exposed to said first and second magnetic field, respectively, and an electric current passes through said first and second tracking coils to drive said objective lens in a tracking direction; wherein said first and second tracking coils are one of rectangular and square in shape; and wherein when said objective lens is not displaced in said tracking direction, a vertical portion of said first tracking coil closest to the centerline is at a first distance from said centerline and in a first direction of rotation by a prescribed angles, and a vertical portion of the second tracking coil closest to said centerline is at a second distance from said centerline equal to the first distance and in a second direction of rotation opposite said first direction of rotation by said prescribed angle.