Method of manufacture of a lens of transparent polymer having a modulated refractive index
US5258024A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 14, 1991 |
| Grant date | Nov 2, 1993 |
| Priority date | — |
| Expiry date | Feb 14, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/0095
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present invention relates to a method of manufacture of an optical lens providing refractive index modulation, characterized in that, starting from a lens of transparent hydrophilic polymer preferably of the hydrogel type, which has previously been shaped, the lens is impregnated with a photopolymerizable composition containing at least one monomer and a photoinitiator, which are in solution in water in the case of a hydrogel, the impregnated lens is subjected to locally modulated irradiation so as to cause local selective polymerization of the monomer, whereupon the excess non-hardened photoinitiator and non-pulverizable monomer is removed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.