Читать книгу Plastics Process Analysis, Instrumentation, and Control - Группа авторов - Страница 41

A stamper for forming a data recording region on a recording medium substrate by means of a transfer surface thereof has been described (57). The transfer surface transfers a predetermined set of data to the recording medium substrate. The stamper is fitted on at least one of the metal molds that are arranged opposite one another for forming the recording medium substrate. The stamper includes a stepped portion formed as bends in the material of the stamper. The stepped portion is configured to project from the transfer surface toward the recording medium substrate.

The substrate may be produced through common injection molding processes and photopolymer processes. The injection molding process is a process in which an acrylic or a PC resin melted by a plasticizer of a molding device is filled into a cavity of a mold fitted with a master disc having microscopic projection/recess patterns for recording/retrieving signals, and the resulting substrate is removed from the mold after the molten resin cools down and is solidified (57).