Crosstalk Analysis for High-precision Optical Pickup Actuator System

The traditional optical pickup actuator model based on the assumption that the actuator spatial magnetic field distributes uniformly ignores the crosstalk characteristic among the movements of different directions. Crosstalk characteristic is a key factor that affects the actuator dynamic property and, consequently, the accuracy of reading and writing operation in the future higher density optical storage systems. In this paper, the actuator spatial magnetic field distribution model is first established, then the crosstalk movement phenomenon of the actuator is analyzed and simulated in CST software based on finite-difference time-domain (FDTD) principle. By investigating the parameters of the width and height of the permanent magnet and the thickness of the focusing coil, it is concluded that the crosstalk characteristic is closely related with these structural parameters and crosstalk can be effectively reduced by optimal design of them, thus, the dynamic performance of the actuator can be improved.