Decoupling Direct Tracking Control System for Super-Multilayer Optical Disk

摘要

This paper presents the decoupling direct tracking control method for the super multi-layer optical disk. The disk includes multiple recording layers and a servo layer with a guiding groove, and data is recorded on each recording layer right above the groove of the servo layer by using two laser beams. However, some disturbances such as disk tilt or lens shift might cause displacement between the two focal points. And due to scratches or finger prints on the disk surface, two focal point's coupling actions destabilize the tracking control. We developed new tracking control method for preventing any displacement and destabilization by the coupling action.