| 摘要 |
PURPOSE:To make it possible to fabricate a self-condensing lens by an extremely simple process and apparatus, by allowing refractive index difference to approach a column radius direction by utilizing the difference in the polymerization speeds of two kinds of monomers. CONSTITUTION:A substrate 2 is held under a photomask 1 by a support mask 1 and a container 4 is filled with a liquid monomer mixture 5. The liquid monomer mixture 5 is formed from a monomer high in refractive index and slow in a polymerization speed, a monomer low in refractive index and high in a polymerization speed and, according to necessity, a photosensitizer, a crosslinking agent, a polymer or a solvent. When parallel ultraviolet rays 6 are irradiated from the upper part of the container 4 and, at the same time, the substrate 2 is slowly fallen, a columnar polymer 7 is formed. This polymer 7 has such refractive index distribution that the refractive index is high in the center but gradually becomes low toward the periphery thereof and a self-condensing lens is obtained from this polymer 7. |
