Actuator is the executing part of Optical Pickup, and its characteristics directly affect the performance of RF signal. Its frequency bandwidth determines the servo stability. With the improvement of data access rate, the dynamic characteristics of actuator need to be improved. At the mean time, the disproportion of magnetic field and assemble error enable the driving cross force and excite the disturbed motion in rolling, pitching and yawing direction, which extremely deteriorate the dynamic ch...
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