Patent ID: 6279959
Filing Date: 2001-08-28
Classification: G11B,Y10S

Abstract:
An optical disc producing method for producing an optical disc comprising a transparent substrate having an information signal recorded surface, a reflective layer formed on the information signal recording surface thereof, an adhesive layer formed on the reflective layer and a dummy transparent substrate on the adhesive layer stacked in this order, the method comprising the steps of:forming the reflective layer on the information signal recorded surface of the transparent substrate;coating an adhesive on the reflective layer to form the adhesive layer, wherein a curing speed of the adhesive is changeable according to a controlled amount of irradiation of electromagnetic radiation rays;disposing the dummy transparent substrate on the transparent substrate sandwiching the reflective layer and the adhesive layer;disposing a mask member over a top surface of the dummy transparent substrate, wherein the mask member has a specific masking pattern for partially shielding the electromagnetic radiation rays; andirradiating the electromagnetic radiation rays on the adhesive layer through the mask member to cause the adhesive to be cured by controlling an amount of irradiation of the electromagnetic radiation corresponding to the specific masking pattern, whereby a position of the reflective layer is microscopically and partially displaced corresponding to the specific masking pattern from an original position of the reflective layer, and thus displaced reflective layer visually exhibits a watermark having the specific masking pattern after the adhesive is cured.