BEAM PICKUP STRUCTURE CAPABLE OF ADJUSTING A SLOPE

摘要

PURPOSE: A beam pickup structure is provided to adjust a relative slope between an objective and a disk. CONSTITUTION: The beam pickup structure comprises: a base(50); a bobbin(60) movably installed on the base(50) and having a first side plane in parallel with an inner diameter direction of a disk and a second side plane in parallel with a track contact direction of the disk, wherein an objective is loaded on the bobbin(60); a focus coil(51) installed on an outside plane of the bobbin(60), for driving the objective toward a focus direction; a track coil(53) attached on the first side plane, for driving the objective toward an inner diameter direction of the disk; a focus/track driving magnet(155) installed at the base(50) so as to look at the first side plane; a tilt coil(173) attached at the second side plane, for driving the objective in correspond to a relative slope with the disk; a first tilt magnet having one magnetic pole installed at the base(50) so as to sit face to face with the tilt coil; a second tilt magnet having one magnetic pole installed at an upper side of the first tilt magnet so as to sit face to face with the tilt coil; a slope detector(80) for detecting a relative slope between the objective and the disk; and a cover assembly(90) for covering the base(50) so as to protect the objective.