Abstract
In optical disc drives (ODD), a short wavelength laser, a high numerical aperture (NA) objective lens, and high track following performance are required for high data capacity and high data transfer rate. However, in disc drive systems using a short wavelength laser and a high NA objective lens, the deterioration of signal by disc tilt becomes serious. 3-axis actuators for active tilt compensation are used to compensate disc tilt. Hybrid-type 3-axis actuator, which has similar mechanical characteristics to conventional 3-axis actuators and simpler in its structure compared with them, is proposed in this paper. In order to optimize the configuration of the hybrid-type actuator, the electromagnetic circuit and moving part are designed by parametric investigations. The performance of the actuator is verified by experiments using proposed actuator.
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