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Pickup systems for optical disks operate in the horizontal and vertical directions for tracking and focusing, respectively. Conventional optical disk control systems are designed for each operated direction. On the other hand, in this paper, we consider the operation trajectory to implement a method for concurrent control of focusing and tracking of optical disks. This paper proposes a two-dimensional...
Recently, the size of digital content has continued to increase; therefore digital storage media have been required to increase capacity by narrowing the track pitch and the gap length between the optical head and the disk. On the other hand, anew optical disk has achieved a rotation speed of over 15,000 rpm. To meet these demands, several control systems for optical disks are proposed to achieve...
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