| 摘要 |
PURPOSE:To obtain surely a plane lens with stable quality by polymerizing the polymers with different refractive indexes on the base material containing protrusions and depressions, which making transparent gel-base material by partially polymerizing the monomer forming reticulated material. CONSTITUTION:Transparent gel-base material is made by partially polymerizing a monomer Ma forming the reticulated polymer Pa with refractive index Na. Then, e.g. the cone shape protrusions 2 projecting on the base material correspondingly to the lens part of refractive index distribution type, are formed at one side 1A of the base material as one body with the base material. The width D, at the root part of this protrusion 2 is caused to be consistent with the diameter of the predetermined lens part. Then, the monomer Mb forming the polymer Pb with the refractive index Nb different from the refractive index of the reticulated polymer, is diffused and polymerized into the base material from the forming surface-side of the protrusion 2. Next, the protrusion 2 is cut off on the same level as that of the plane part 1A of the base material and the plane is finished by polishing. |
