Hybrid actuator for high speed and high precision optical disk drives

Abstract

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. (C) 2000 Published by Elsevier Science Ltd.