Meeting to the focusing coil and the tracking coil and the aforementioned focusing

摘要

PROBLEM TO BE SOLVED: To provide an optical pickup actuator which realizes prevention of degrading of driving sensitivity and stabilization of positional control in positional control of a lens holder and which can be miniaturized, and to provide an optical pickup and an optical recording and reproducing apparatus thereof.;SOLUTION: A permanent magnet 1 comprises a plurality of magnetizing areas which are adjacent to reversed poles through neutral zones 4 to 6, on the surfaces that face a focus coil 2 and a tracking coil 3. Regarding a neutral zone on a magnetizing surface facing at least one of the focus coil 2 and the tracking coil 3, a part 5 of it faces a direction nearly at a right angle to the direction of driving force occurring at the corresponding coil 2, and is formed at a position normal to a line passing through nearly the center of the corresponding coil 2. The remaining part 6 is formed obliquely so that an angle θ formed between the part 5 of the neutral zone and itself may be an obtuse angle from one end or both of the ends of the part 5 of the neutral zone through the outer peripheral part of the permanent magnet.;COPYRIGHT: (C)2007,JPO&INPIT