Graded-refractive-index optical plastic material and method for its production
AssigneeYasuhiro Koike
InventorsYasuhiro Koike, Masaki Naritomi
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Abstract
A graded-refractive-index optical plastic material composed of an amorphous fluoropolymer and at least one material which differs from the polymer in refractive index by at least 0.001, wherein the material is so distributed as to have a concentration gradient in a specific direction, and a method for its production.
Claims15
A graded-refractive-index optical plastic material composed of an amorphous fluoropolymer (a) which substantially has no C--H bond and has a cyclic structure on its main chain, and at least one material (b) which differs from the fluoropolymer (a) in refractive index by at least 0.001, wherein the material (b) is distributed in the fluoropolymer (a) so as to have a concentration gradient in a specific direction and a refractive index that varies continuously in said specific direction.
A method for producing a graded-refractive-index optical plastic material, which comprises melting an amorphous fluoropolymer (a) which substantially has no C--H bond, injecting at least one material (b) which differs in refractive index by at least 0.001 from the fluoropolymer (a) or the fluoropolymer (a) containing the material (b) at the center of the melt of the fluoropolymer (a), and molding the melt while or after diffusing the material (b) to form a region wherein the refractive index varies continuously.
Dependencies are inferred from the claim text.