Abstract
DVD disc vibration at the critical number of rotations was examined to determine its cause and identify a means of reducing it. Disc vibration at the critical number of rotations is considered the vibration mode of a DVD disc, and the position of this vibration mode is always the same for a DVD drive. The relative inclination between the optical head and disc increases with the vibration. This paper describes the stabilization of the disc in a DVD recording system during high-speed rotation of the disc. The top cover of the drive is equipped with a disc vibration control structure that controls the (0,2)-(0,4) vibration modes of the disc at the critical number of rotations, thereby reducing the relative inclination between the optical head and disc significantly.
