Patent ID: 7969829
Filing Date: 2011-06-28
Classification: G11B

Abstract:
1. An objective lens driving apparatus comprising: an objective lens for focusing a laser beam on a disc-shaped recording medium; a lens holder, which holds said objective lens and which is driven at least in a tracking direction of the disc-shaped recording medium ; a pair of linear suspension springs for supporting said lens holder on one ends so as to sandwich said lens holder from both sides thereof, viewed in a planar manner from an optical axis direction of said objective lens; a spring holder to which each of the other ends of said pair of linear suspension springs is fixed; and a driving device for at least tracking-driving said objective lens and said lens holder, said pair of linear suspension springs having a narrower or wider distance between the one ends than that between the other ends, viewed in the planar manner from the optical axis direction, wherein a driving center in tracking-driving said lens holder is positioned at an intersection of (i) a first linear segment passing said one end of one linear suspension spring of said pair of linear suspension springs and intersecting the one linear suspension spring at a right angle, with (ii) a second linear segment passing said one end of the other linear suspension spring of said pair of linear suspension springs and intersecting the other linear suspension spring at a right angle, viewed in the planar direction from the optical axis direction.