ROLL STAMPER FOR MOLDING BASE SHEET FOR INFORMATION RECORDING MEDIUM AND PREPARATION THEREOF AND PREPARATION OF BASE SHEET FOR INFORMATION RECORDING MEDIUM USING ROLL STAMPER

摘要

PURPOSE:To form continuously and accurately an uneven preformat on a resin sheet by making the length being parallel to the carrying direction of the resin sheet to be shorter than the length in the vertical direction on the outermost truck of an uneven preformat pattern which a roll stamper has. CONSTITUTION:When the length being parallel to the carrying direction D of a resin sheet is made to be a and the length being vertical to the carrying direction D of a resin sheet is made to be b on the outermost truck of a preformat pattern 11 for an optical disc which a stamper 21 fixed on a roll base material 22 constituting a roll stamper 42 has, the value of b/a is made larger than 1. It is thereby possible to correct strain caused by elongation of the stamper and shrinkage of the resin sheet when the preformat is transferred and to transfer a preformat with a high degree of true circle.