Liquid photochromic filter
US11125923B1 · kind B1 · utility
0Cited by
3References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 26, 2017 |
| Grant date | Sep 21, 2021 |
| Priority date | — |
| Expiry date | Dec 31, 2039 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/54
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A liquid photochromic filter for attenuating an image is disclosed. The liquid photochromic filter includes a photochromic dye in a liquid solution that is contained in a cavity defined by a housing with two optical windows. The liquid photochromic filter may be used in imaging system for sensing light in an area of high optical contrast. In some implementations, the imaging system is for monitoring a welding operation, whereby the liquid photochromic filter is used to reduce the intensity of the light observed from the welding arc.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.