optical system of a split type magneto-optical disk drive, the most serious problem is that optical axis tilt and position shift of the moving part could induce large tracking offset. In this research, a mask is used to confine the beam reflected from the disk, such that focus and tracking error signal can be modified. In this way, tracking error signal drift caused by the actuator, while track following, can be decreased. In addition, the DC tracking offset of the moving part, while moving along the guide rod, can be reduced. Crosstalk between tracking and focus signal also can be lowered. In this paper, the optical system simulated by ray tracing and the design of the mask are studied. The test results of the system show that the mask can successfully decrease the tracking offset caused by optical axis tilt and position shift of the moving part.
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