Patent ID: 7349295
Filing Date: 2008-03-25
Classification: G11B

Abstract:
1. An optical head device comprising: an objective lens for bringing light emitted from a light source into focus on an information recording medium; a lens holder for holding said objective lens, said lens holder having a bearing hole formed along a direction parallel to an optical axis of said objective lens, the bearing hole is formed such that a shape from the bearing hole's bottom opening, through a center opening, to the bearing hole's top opening is a parabolic shape such that a diameter of the bearing hole's top opening and bottom opening are larger than the diameter of the center opening which is a distance between the bearing hole's top opening and bottom opening; a support shaft inserted in said bearing hole; a light detector for receiving said light reflected from said information recording medium and outputting information about inclination of said objective lens relative to said information recording medium on the basis of said light received; and an inclination drive unit for, according to said information about said inclination, turning said lens holder on a first axis perpendicular to said support shaft.