Method of fabricating a lens made of transparent polymer with mo

Details Method of fabricating a lens made of transparent polymer with mo Method of fabricating a lens made of transparent polymer with mo

1993-06-04

1994-03-22

Pianalto, Bernard

Stock material or miscellaneous articles

Composite

Of addition polymer from unsaturated monomers

427164, 427272, 427273, 427274, 427336, 427352, 427353, 427492, 427510, 427518, 427558, 428522, B32B 2730

Patent

active

052963055

ABSTRACT:
The present invention relates to a method of manufacture of an optical lens providing refractive index modulation, characterized in that, starting from a previously shaped lens of transparent hydrophilic polymer of the hydrogel type, the lens is impregnated with a photopolymerizable composition containing at least one monomer and a photoinitiator in solution in a solvent which causes swelling of the lens, the impregnated lens is subjected to irradiation which is spatially modulated in irradiation intensity and/or irradiation time, thus causing local selective polymerization of the monomer, whereupon the excess quantity of photoinitiator and non-polymerized monomer is removed by solvent extraction.

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