Patent ID: 6382955
Filing Date: 2002-05-07
Classification: B29C,B29D,G11B,Y10S

Abstract:
A disc molding apparatus for forming an optical disc in a disc molding process, the disc molding apparatus comprising:a disc substrate cavity for forming a disc substrate therein; a sprue mechanism in fluid communication with the disc substrate cavity for forcing disc molding material into the disc substrate cavity; a removable stamper located on one side of the disc substrate cavity for forming formatted data into the disc substrate; an inner holder releasibly mounted adjacent said removable stamper for releasibly locking said removable stamper within the disc molding apparatus, the inner holder including a locking mechanism for retaining said removable stamper in the disc molding apparatus; and means for forming a disc alignment mechanism in the disc substrate, positioned between the formatted data and a center of the disc substrate, wherein the concentricity of the formatted data is specified relative to the disc alignment mechanism, wherein the means for forming a disc alignment mechanism includes the inner holder, wherein the inner holder includes a shape imparting mechanism located adjacent the locking mechanism for forming the disc alignment mechanism into the disc substrate.