| 摘要 |
PURPOSE: To prevent generation of a lifting and a wrinkle by using the stamper which is composed of an electroformed film comprising a preformatted pattern and composed mainly of a nickel and in which the coefficient of linear expansion of the electroformed film is smaller than the coefficient of linear expansion of a molding roll. CONSTITUTION: A stamper for manufacture of an optical recording medium is composed of a metal thin film 3 comprising a preformatted pattern and of an electroformed film 2. Then, the electroformed film 2 is composed of a nickel electroformed film, and its coefficient of linear expansion is set at 1.3×10<-5> mm/mm. deg.C or lower. By using the electroformed film which is formed in this manner, the coefficient of linear expansion of the stamper is made smaller than the coefficient of linear expansion of a molding roll. As a result, it is possible to obtain the stamper which is not levitated from the roll at a temperature applied in a molding operation. |
