System identification and control of piezo-based actuators for optical pickup devices

Toward the development of optical data storage system, higher resolution and broader operating bandwidth optical pickup is necessary for high data-density optical discs such as Blu-ray disc (BD). This paper is aim at developing a piezo-based actuator to replace existing voice coil motor (VCM) actuator for providing precise tracking and focusing positioning in optical disk devices. Double lead compensator is designed to forge control efforts toward precise tracking and focusing motions, while verifying the capability of the piezo-based actuator. Simulation and experiments are conducted to evaluate the performances of the proposed actuator for precise positioning of optical pickup devices.