| 摘要 |
PURPOSE:To obtain a stamper which has a good mold parting property, decreases surface defects and has high accuracy in pit height at a low cost by providing a metallic film on a glass substrate and selectively etching the surface thereof to form pits. CONSTITUTION:There is heretofore the problem that a defect is generated in the surface of a master 7 by the local dispersion in the mold parting property between a glass mother 6 and Ni in a process for stripping the master 7 formed on the glass mother 6. The metallic film is, thereupon, provided on the glass substrate 1 and the surface thereof is selectively etched to form the pits in a mastering process for an optical disk. A thin Ni-Cr alloy film 2 is used as the material of said metallic film and the content of Cr is specified to >=3%. The stamper 8 which has the good mold parting property, decreases the defects and has the lower variance in the pit height is thereby obtd. in a large quantity at a low cost.
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