| 摘要 |
PURPOSE: An optical disk having different specific gravity of print paint according to positions is provided to secure the equality and the stability in rotation of the optical disk rotating at high speed. CONSTITUTION: In an optical disk having different specific gravity of print paint according to positions, an outer peripheral print area(52) of the optical disk is printed by paint having a relatively heavy specific gravity; an inner peripheral print area(51) of the optical disk is printed by paint having a relatively light specific gravity; wherein the outer peripheral print area is printed rotatively symmetrically centering around a center point of the optical disk. |
