| 摘要 |
PURPOSE:To maintain specified quantity of signal light by forming a plastic substrate by using a metallic mold formed from a photoresist film by irradiating interfered laser light to the photoresist film and developing the film and forming a metallic film on the substrate. CONSTITUTION:A photoresist 2 is coated on the substrate 1 and a light beam from a light source is divided to four beams and the beams are collimated to parallel rays of light by collimating lenses 3-6. These parallel rays of the light irradiate the exposing part 11 on the photoresist 2. Interference fringes are thereby formed into a meshed shape and are developed to form the meshed ruggedness of the period substantially smaller than the diameter of recording pits. A nickel film is formed by electroless plating on the meshed pattern surface and is made into a metallic mold by an electroforming method. Plastic is molded by using such mold by which the disk substrate 14 uniformly formed with the meshed pattern 16 is formed. The metallic film 15 is then formed on the pattern 16. The moth eye disk with which the specified quantity of the signal light is made is thus produced. |
