Spectacle lens comprising an activable optical filter and optical equipment comprising such spectacle lens
US11586056B2 · kind B2 · utility
0Cited by
2References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 19, 2018 |
| Grant date | Feb 21, 2023 |
| Priority date | — |
| Expiry date | Jun 24, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2201/44
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A spectacle lens includes an activable optical filter having at least an electrochromic device and being configured to be actively switched between at least three configurations. In the first configuration, the activable optical filter is uniform. In the second configuration, the activable optical filter attenuates selectively light from a localized light source. In the third configuration, the activable optical filter is uniform. Furthermore, the chromaticity difference ΔChrom between each of the configurations is smaller than or equal to 20.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.