Patent ID: 7136331

Claim:
A disk drive including a turntable attached to a chassis and rotating a disk mounted thereon, a guide shaft fixed to said chassis, and an optical pick-up rotatably attached to and moving along said guide shaft, wherein said optical pick-up has a lens holder provided with a slide hole and holding an objective lens emitting light beams irradiating the disk on said turntable, and a lens holder supporting portion having a slide shaft penetrating said slide hole and supporting said lens holder, said lens holder includes a focusing coil arranged to be wound around said slide hole for causing the lens holder to move along said slide shaft such that said light beams are focused on a track of said disk, a tracking coil wound at a side portion of the lens holder around a direction crossing said slide shaft for causing the lens holder to rotate around said slide shaft to establish two-dimensional alignment of said light beams, and a pair of ferromagnetic plates arranged to sandwich said focusing coil from the top and the bottom and provided with a hole to include said slide hole, said lens holder supporting portion includes a first permanent magnet and a second permanent magnet sandwiching said lens holder as seen in two dimensions and having their magnetic poles of the same polarity opposite to each other, and a sidewall of the slide hole of said lens holder is pressed against the slide shaft of said lens holder supporting portion.