Optical filter with light source
US10310300B2 · kind B2 · utility
3Cited by
4References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 19, 2018 |
| Grant date | Jun 4, 2019 |
| Priority date | — |
| Expiry date | Jan 19, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C7/101
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An apparatus comprising a switchable optical filter comprising a layer of switchable material, the switchable material comprising a photochromic/thermochromic, a photochromic/photochromic, or a photochromic/electrochromic compound; a first light source providing light of a wavelength that causes the switchable material to transition from a faded state to a dark state, or a dark state to a faded state; and a switch for controlling activation of the first light source.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.