304 次世代光ディスク装置の高密度化対応制御系の開発(精密・情報機器の制御I)(OS 精密・情報機器の制御)

抄録

In the optical head servos of optical units, the restraint of vibration, both from the head itself and from external disturbances has become an important technical issue. In this paper, we introduce a hybrid control method that combines the use of an external disturbance observer with that of a VSS(Variable Structure System) controller for the purpose of restraining vibration, and we show that this method results in reduction of actuator displacement to 75% of that achieved with previous methods.