| 摘要 |
PURPOSE:To obtain an optical disc forming stamper less in distortion which can form a high-capacity optical disc, by plating thickly a nickel film of the stamper with copper of less internal stress by electroforming. CONSTITUTION:A photo resist is applied to a glass substrate 1 to form a photo resist film 2, and a minute patterns 3 is formed by exposure and development. A metallic thin film 4 is formed by silver mirror electroless plating, sputtering, or vapor-deposition. This metallic thin film 4 is used as a conductive film to form an electroforming nickel film 5 in a nickel plating bath. Thereafter, the metallic thin film 4 and the nickel film 5 are peeled from the photo resist film 2 to obtain the stamper having a pattern to which the pattern formed on the photoresist is inverted. When this stamper is held by a chuck to form an optical disc by the 2P methods, this optical disc has less undulation in the peripheral direction as well as the radial direction and is flat. |
