Patent ID: 6099287
Filing Date: 2000-08-08
Classification: B29C,B29D,Y10S

Abstract:
A stamper protecting layer arranged on a whole surface of a stamper which faces a first mold of molds for molding an optical disk from resin material which is injected into the molds at an injection temperature, said stamper protecting layer being interposed between the first mold and the stamper fitted to the first mold to form pits representing recording information on the optical disk;wherein the stamper protecting layer comprises a wear preventing member which, at a temperature not higher than the injection temperature, undergoes a physical change to cause said wear preventing member to absorb forces generated by extension and shrinkage of the stamper in a diametrical direction of the stamper relative to the first mold and thereby prevents the stamper from being deformed upon molding of the optical disk; andwherein a reaction preventing material is provided at each of opposing faces of the wear preventing member which come into contact with the first mold and the stamper in a thickness direction of the wear preventing member, to prevent chemical reaction between the wear prventing member and the stamper and between the wear preventing member and the first mold to thereby prevent the stamper from being deformed.