Optical pickup actuator having high sensibility and optical recording and/or reproducing apparatus employing it

摘要

A bobbin on which the objective lens and; Suspension for movably supporting the bobbin with respect to the base; The bobbin and the magnetic circuit, which is installed on the base; and this highly sensitive optical pickup actuator employing the optical recording and / or reproducing apparatus is disclosed comprising a. ; A magnetic circuit mounted to the base so as to be located to face the both side surfaces of the bobbin, and at least having a first to third magnetic domain structure, some regions that are side-by-side arrangement with each other in the tracking direction, the first and third magnetic domain respectively adjacent to the second magnetic domain positioned at the center and a pair of magnetized in the opposite polarity and the second magnetic region and the magnet; It is wound around the bobbin circumference, the second magnetic region and the mutual focus coil and acting; The sides of the bobbin facing the magnets, a plurality of tracking coils are arranged to be used as an effective coil for tracking control two sides parallel to each other in the tracking direction; characterized in that it comprises a. ; According to the disclosure, since the use of both sides of the tracking coil in the tracking control, it is possible to realize a high sensitivity tracking.