| 摘要 |
PURPOSE:To provide a stamper which has excellent durability in the stage of reproduction and permits easy working by forming the 1st electroforming Ni film having a specific thickness on a substrate by using an insoluble electrode then forming the 2nd electroforming Ni film having a prescribed thickness thereon by using a soluble electrode. CONSTITUTION:The electroforming Ni film is formed on the master disk having a fine pattern by using the insoluble electrode in an Ni bath and is stripped to form a mother stamper. The surface of the mother stamper is subjected to a treatment for accelerating stripping and thereafter the 1st electroforming Ni film is formed thereon to 1-10mum thickness by an electroforming device for which the insoluble electrode is used. The 2nd electroforming Ni film is then formed thereon to about 250mum thickness by an electroforming device for which the soluble electrode made of granular Ni is used. The film is stripped from the mother stamper and a stamper for forming an optical disk, etc. is obtd. The durability of the stamper is improved and the drawing property is improved by the formation of two layers of the Ni films.
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