Study of Axial Acceleration Improvement of Stacked Volumetric Optical Disks

developed whose read/write characteristics are comparable to 1.2-mm-thick optical disks. The development difficulty of the thin optical disks was the achievement of stable rotation equivalent to 1.2-mm-thick optical disks. This report presents the results of studies conducted to improve the axial accelerations of thin optical disks on 8× speed (27.92 m/s) based on the digital versatile disc recordable (DVD-R) format. Our studies showed improvements of the transparent glass disk stabilizer and the smoothing of the thin optical disk surface. Axial accelerations were improved to a practical level less than 73 m/s based on 8× DVD-R specifi cations.