MOLD FOR MOLDING DISK, LAMINATED SUBSTRATE, AND ITS PRODUCTION METHOD

摘要

PROBLEM TO BE SOLVED: To prevent the generation of defective lamination by the mutual interference of cut burrs when two disk substrates are bonded. SOLUTION: A laminated substrate is produced by bonding the disk substrates. A fixed side mirror block 18, a stamper 32 for forming information surfaces which face each other when the disk substrates are bonded, a fixed side cutter for forming a cut hole 41 by the first and second tip faces S14, S15, a movable side mirror block 37, and a movable side cutter which applies boring processing to the original mold of the disk substrate are provided. The first tip face S14 is set at a forward position separated by a prescribed distance H from the surface S3 of the stamper 32 and forms steps on the surfaces of the disk substrates along with molding. The tips of the cut burrs formed in the inner circumferential fringes of the holes of the disk substrates are not protruded from the information surfaces of the disk substrates.