Patent ID: 6514437
Filing Date: 2003-02-04
Classification: B29C,B29D,Y10S

Abstract:
An optical disk molding method comprising:injecting a resin material into a plurality of molds to mold an optical disk, the plurality of molds having a stamper protecting layer between a first mold of the plurality of molds and a stamper fitted to the first mold, the stamper being adapted to form pits on the optical disk; while said injecting of the resin material occurs, changing physical properties of the stamper protecting layer at a temperature not higher than an injection temperature of the resin material, the physical properties being that the stamper protecting layer has a melting point not higher than the injection temperature and that the stamper projecting layer is melted or softened at the injection temperature; and absorbing the forces generated by extension and shrinkage of the stamper in a diametrical direction of the stamper with the stamper protecting layer when the resin material is injected to prevent the stamper from being deformed, wherein the stamper protecting layer is a wear preventing member of metal, and a reaction preventing material is provided between the first mold and the wear preventing member, and between the stamper and the wear preventing member, the reaction preventing material preventing a chemical reaction between the wear preventing member and the first mold, and the wear preventing member and the stamper.