Bonded composite disk of single-side recorded type, and method and

Abstract

Method and apparatus for producing a bonded composite disk including a first and a second disk component which are bonded together, using a mold including a first mold half having first concentric elements whose axial end faces cooperate with an annular information-bearing stamper or an annular blank stamper, to provide a first molding surface, and a second mold half having a second concentric elements whose axial end faces provide a second molding surface cooperating with the first molding surface to define a cavity for forming each of the first and second disk components. The diameters of first annular boundaries between the end faces of the adjacent first concentric elements are different from those of second annular boundaries between the end faces of the adjacent second concentric elements, and the first disk component formed with the information-bearing stamper set on the first mold half is bonded at a first bonding surface formed by the first molding surface to a second bonding surface of the second disk component that is formed by the second molding surface with the blank stamper set on the first mold half.