PURPOSE: To form a synthetic resin spherical lens having a refractive index gradient by perfecting the polymn. of transparent spherical gel particles after diffusion which are the base material for a graded index type spherical lens made of a synthetic resin by heating, etc. in a satd. aq. soln. of a monomer.
CONSTITUTION: The transparent spherical gel particles after diffusion are perfected in polymn. by heating, etc. not in water but in the satd. aq. soln. of the monomer Mb. The release of the monomer Mb from the gel particles during the heat treatment stage is considerably prevented by such polymn., by which the refractive index gradient in the graded index type spherical lens is steepened and the formation to approximately the square distribution to the periphery or near the periphery of the spherical lens is made possible.
KOIKE YASUHIRO
MAEDA KOICHI
TAKIGAWA AKIO
AOKI YUICHI
TAGO IKUO
MASE SHOJI
YOSHIDA MOTOAKI
OTSUKA YASUJI