| 摘要 |
PURPOSE:To manufacture easily a highly efficient nonspherical lens or a prism or thick optical parts, by a method wherein an arbitrary nonspherical optical layer with synthetic resin injected on an optical surface of spherical glass parts is formed on the optical surface of the spherical glass parts. CONSTITUTION:Prior to injection molding of optical resin 3, spherical optical glass parts to be put on a lens cavity 10, for example, a spherical convex lens 14 is produced. The spherical convex lens 14 is put on the lens cavity 10 formed in a mold 7. In this instance, an air gap is formed between a aspherical mold 13 and the surface of the lens cavity 10, in the spherical convex lens 14. When preparation of the spherical convex lens 14 is completed, molten optical resin 3 is pushed into the mold 7 from an injection molding machine 1. The molten optical resin 3 pushed into through a nozzle 5 of an end of an injection cylinder 4 is filled into the air gap formed between the nonspherical mold 13 and the surface of the lens cavity 10 from a gate 9 by passing through a sprue 8. A aspherical resin layer 15 becoming a nonspherical optical layer is formed on the spherical convex lens 14 and a nonspherical convex lens is molded. |
