| 摘要 |
PURPOSE:To obtain an optical disk having a center hole that is a proper circle and with small eccentricity, by molding a substrate and a metal laminated disk member separately, and joining both members over entire main planes. CONSTITUTION:A transparent circular substrate 7 having a large circular center hole 8 is formed, and the metal laminated disk member 1 having a small center hole 4, the inside diameter of which is smaller than that of the large circular center hole 8, and having an outside diameter larger than the inside diameter of the large circular center hole, is formed. Next, the metal laminated disk member 1 is placed on one main plane of the circular substrate 7 through a bonding agent 9, and after the small circular center hole 4 of the metal laminated disk member 1 is positioned concentrically for the circular substrate 7, the bonding agent is hardened. Next, a die disk having a transfer plane is placed concentrically on the main plane on either side of the circular substrate 7 through ultraviolet hardening resin liquid 12, and transfer is performed by hardening the ultraviolet hardening resin liquid. In such a way, it is possible to reduce the quantity of the eccentricity at the center of the center hole, and to obtain a durable optical disk. |
