Patent ID: 8127820

Claim:
A system for producing optical medium, the system comprising: a stamper designed to cause a substrate being molded to have a distorted pit geometry being longer and thinner than that of a perfect pit geometry supposed to be created on the substrate, the distorted pit geometry being reversely corrected in inherent distortion of the substrate due to a short molding time such that a pit geometry on the substrate becomes nearly perfect; at least a first and a second molding station, the first molding station producing first substrates and the second molding station producing second substrates, wherein the first molding station includes the stamper, the pit geometry on each of the first substrates from the stamper is distorted but reversely corrected after each of the first substrates is released from the first molding station; at least a first bonding and a second bonding station, each of the first and second bonding stations sequentially receiving the first and second substrates and bonding one of the first substrates and one of the second substrates with a type of glue between the first and second substrates to form a disc or part of a disc; and means for curing the glue.