| 摘要 |
Optical-disk stamper that prevents mold-release defects caused by mold-release irregularities that occur when the mold is op,ened while improving transferability during disk molding to enable the manufacture of high-quality optical disks at a favorable yield rate. On one side of a stamper body (1), a molding surface (2) furnished with bumps (3) for imprinting pits into an optical disk is formed. The molding surface, including the bumps, is formed of a polymer resin whose thermal diffusivity is 0.01 m2/h or under. More preferably the molding surface is formed of a poorly heat-conducting phenolic resin whose thermal diffusivity is between 0.0004 and 0.001 m2/h, suppressing heat diffusion from the molten resin toward the stamper during the disk molding process and nullifying rapid cooling and local hardening of the resin.
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