Process of using radiation-sensitive carrier body to form stamper structure and subsequent use as a stamper to make optical disks

A method for manufacturing a stamper structure which is used to manufacture optical disks, comprising the steps of:

• (a) preparing a disk-shaped carrier body which has a radiation-sensitive layer which serves as a single recording layer which absorbs energy froma beam with which said layer is irradiated and which locally expands and deforms due to discharging of a gas component contained therein, a substrate for supporting said radiation-sensitive layer, and a first adhesive layer which is interposed between said substrate and said radiation-sensitive layer and which adheres said radiation-sensitive layer to said substrate;
• (b) additionally providing said carrier body with a metal layer, which has a releasability sufficient to easily separate it from a disk substrate made of a preselected material for manufacturing optical disks, and a second adhesive layer which is provided between said radiation-sensitive layer and said metal layer and which has an adhesion strength sufficient to effectively adhere said metal layer to said radiation-sensitive layer;
• (c) irradiating, after said metal layer and said second adhesive layer are additionally prepared, a focussed radiation beam to form on said carrier body a spot having a diameter of the order of microns, in a manner as to cause said radiation-sensitive layer to absorb energy of the beam and deform due to the discharging of the gas component, thereby forming a protuberance in said metal layer of said carrier body;
• and
• (d) directly using the carrier body having said protuberance as a stamper structure for manufacturing optical disks each of which comprises a substrate in a surface of which a groove corresponding in shape to the protubuerance is formed.