| 摘要 |
PURPOSE: An actuator of an optical pick-up device is provided to reduce asymmetrical distortion in driving power of an actuator caused by various deviation of magnets when employing a plurality of magnets in the actuator of an optical pick-up device as well as reducing production costs generated by using the plurality of magnets. CONSTITUTION: A bobbin(20) is provided with a pair of tracking coils(17), a pair of focusing coils(16) and a lens(18). A magnet applies a magnetic flux to the tracking coils(17) and the focusing coils(16) in an outer periphery of the bobbin(20). A yoke(15) surrounds the magnet. An actuator includes the bobbin(20), the magnet, and the yoke(15). The magnet's inside has an empty cylindrical shape. The magnet is formed of multi-electrodes and the magnet's each part generates each magnetic flux. Empty cylindrical permanent magnets(11,12,13,14) are arranged inside the cylindrical yoke(15). The cylindrical bobbin(20) on which the lens(18) is mounted is positioned in a central space of an inside of the actuator surrounded by the permanent magnets(11,12,13,14). The focusing coils(16) for controlling focusing and the tracking coils(17) for controlling tracking are installed to face each other in the outer periphery of the bobbin(20).
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