Patent ID: 7497916

Claim:
A method of manufacturing a multilayer optical information recording medium comprising: providing a substrate having a central hole and a surface, wherein the substrate comprises at least one signal recording layer(s) and wherein one of the at least one signal recording layer(s) is provided on the surface of the substrate, fixing said substrate to a support base having a central hole configured to allow air to flow therethrough, measuring a surface shape of one or a plurality of said substrates, shaping a stamper such that the stamper is provided with (1) guide grooves and/or pits corresponding to an additional signal recording layer, (2) a central hole, and (3) a shape which corresponds to said measured surface, forming a separation layer having a central hole by providing a material between the stamper and the substrate such that the separation layer separates the signal recording layer provided on the surface of the substrate from the additional signal recording layer provided on the stamper, attaching a handling means to the stamper, and peeling the stamper from the separation layer by (1) inserting a lug into the central holes of the separation layer and the stamper, (2) introducing pressurized air from the central hole of the support base while opening the lug outward, and (3) pulling up the handling means.