Patent ID: 6687062
Filing Date: 2004-02-03
Classification: G11B

Abstract:
An objective lens driving apparatus comprising:an objective lens, having an optical axis and focusing light emitted from a light source on an information recording medium; a lens holder, holding said objective lens and having a bearing hole formed therein that extends in a direction substantially parallel to the optical axis; a shaft inserted into the bearing hole so that said lens holder is rotatably supported on the shaft; a pair of magnets supported on said lens holder, said pair of magnets being positioned in such a way that said shaft is between said pair of magnets; a base made of a magnetic material and having a pair of magnetic yokes disposed such that each of said pair of magnets exerts an attraction force on a corresponding one of the pair of magnetic yokes to urge said lens holder both in a direction substantially parallel to the optical axis and in a direction substantially perpendicular to the optical axis; a first coil set of a first focusing coil and a first tracking coil and a second coil set of a second focusing coil and a second tracking coil, said first coil set and said second coil set being wound around corresponding ones of said pair of magnetic yokes.