Hybrid electro-active lens
US7019890B2 · kind B2 · utility
121Cited by
4References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 24, 2004 |
| Grant date | Mar 28, 2006 |
| Priority date | — |
| Expiry date | Aug 24, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/294
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An electro-active lens is disclosed. The lens includes at least one electro-active cell to provide a lens having at least two focal lengths, the electro-active cell capable of adjusting its focal length based on voltages applied to the electro-active cell. The voltage is supplied by an alternating current source, including a flying capacitor circuit. The electro-active lenses reduce birefringence through the use of a single cholesteric liquid crystal electro-active cell.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.