Variable focus spectacles
US7553019B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 1, 2004 |
| Grant date | Jun 30, 2009 |
| Priority date | — |
| Expiry date | Jul 17, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C7/085
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The invention concerns variable focus spectacles in which the electro-wetting effect is utilized to provide a manually or automatically variable focal length. The variable focus spectacles (200) comprise a spectacle frame (210) and at least one variable power lens (100A, 100B). The lens (100) comprises a transparent rear wall (110), a transparent front wall (120), a cavity (140) formed between the transparent front wall (120) and the transparent rear wall (110), first and second immiscible fluids of differing refractive index contained within said cavity, and electrodes (150, 160) for applying an electric field to said fluids to change a contact angle between an interface layer (M) of the two fluids and the front wall of the lens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.