Method for manufacturing bifocal lens
US7510281B1 · kind B1 · utility
Assignees
Inventors
Key dates
| Filing date | Oct 1, 2007 |
| Grant date | Mar 31, 2009 |
| Priority date | — |
| Expiry date | Oct 4, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C7/12
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
This invention is to provide an inexpensive lens can be worn without attention to the existence of the addition power segment of conventional polarizing lens, it and a bench lens are formed integrally on the rear surface of a polarizing member 6. The present inventors constituent a polarizing member 9 by sandwiching poly vinyl alcohol 3 as a polarizing film with poly carbonate 2 whose both surfaces are stretched, and mold resin 2′ on the rear side of the polarizing member, and arrange an addition power segment 8 integrally on the rear surface, make the molded resin poly carbonate sandwiches the polarizing film. The top and the bottom of this member are cut as FIGs. to form lens at low costs, and the adhesion among respective resins is increased, and to secure the impact resistance and it is possible to create a lens without detachment because of same resin.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.