Patent ID: 6791772
Filing Date: 2004-09-14
Classification: G11B

Abstract:
An objective lens driver comprising:a movable body, which includes an objective lens to focus a light beam, a lens holder to hold the objective lens thereon, and a coil substrate, the coil substrate including a focusing coil and at least one tracking coil and being secured onto the lens holder; a base: a supporting portion for supporting the movable body much that the movable body is movable in a focusing direction and a tracking direction with respect to the baso, the focusing direction being parallel to the optical axis of the objective lens, the tracking direction being perpendicular to the focusing direction; and a first multipolar magnet and a second multipolar magnet, which are secured to the base so as to sandwich the coil substrate with a gap provided between each of the first and second multipolar magnets and the coil substrate, wherein the focusing and tracking coils are arranged as two flat coils on two mutually parallel separate planes so as to overlap with each other at least partially in a direction that is perpendicular to the focusing and tracking directions.