Hybrid actuator for high speed and high precision optical disk drives

This paper presents a new hybrid actuator for improving the performances of optical pickup actuators. The hybrid actuator is composed of a moving-magnet type actuator for the tracking motion and a moving-coil type actuator for the focusing motion. This configuration gives several benefits such as, a possibility for designing a compact bobbin structure, improved force and vibration characteristics, and robust operations. The moving-magnet and the moving-coil type actuators are designed optimally by parametric investigations to increase the force constants. The effectiveness of the proposed actuator is confirmed experimentally in terms of frequency response characteristics.