Patent ID: 7381286
Filing Date: 2008-06-03
Classification: B26F,G11B,Y10T

Abstract:
1. A laminate sheet material punching method for punching a part of a cover sheet from a laminate sheet material in such a manner as to correspond to the shape of a recording side of a disk substrate of an optical disk, the laminate sheet material including the cover sheet having an adhesive film and a resin film, a strip-off sheet adhered to the adhesive film, and a protective sheet adhered to a surface of the cover sheet, which surface is opposite from the adhesive film, the laminate sheet material punching method comprising the steps of: pressing a punching blade whose blade tip extends along a path corresponding to the peripheral edge of the recording side of the disk substrate, against the surface of the strip-off sheet; and cutting the cover sheet toward the protective sheet from the side of the strip-off sheet with the punching blade, wherein the blade tip reaches a vicinity of the middle of a thickness of the protective sheet during the cutting.