Method of making eyeglass lenses with add on segments
US5938876A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 27, 1998 |
| Grant date | Aug 17, 1999 |
| Priority date | — |
| Expiry date | Jan 27, 2018 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29K2105/243
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
In order to enable ophthalmic (eyeglass) lenses with add-on lens segments to be produced economically so as, for example, to provide a multi-focal addition to a base single lens and dispensed to a user, the add on segment is molded from a liquid photpolimer and partially cured to a state where it is elastomeric (a gel which holds its shape). The segment is then located upon a surface of the base lens which acts as a substrate where the base lens which acts as a substrate and conforms to the surface even if the surface has special corrective curvature as for astigmatism. The base lens may be a conventional plastic lens (acrylic or polycarbonate). No additional adhesive is required. When in place the curing of the segment is completed so that the multi-focal lens with the segment adhering to the base lens is produced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.