Laser-protection variable transmission optical device
US12222623B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 9, 2023 |
| Grant date | Feb 11, 2025 |
| Priority date | — |
| Expiry date | Nov 9, 2043 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/13475
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A laser protection variable transmission optical device (“LP-VTOD”) includes first and second cells, each capable of changing from a state of higher light transmittance to a state of lower light transmittance. The first cell is characterized by a narrow band absorption having a first peak absorption wavelength and a first FWHM of 175 nm or less, and the second cell is characterized by a narrow band absorption having a second peak absorption wavelength and a second FWHM of 175 nm or less. The first peak absorption wavelength may be the same or different than the second peak absorption wavelength. The LP-VTOD is capable of switching from a clear state to a darkened state having a darkened state transmittance % TDS-P that is equal to or less than 10% for at least one of the first or second peak absorption wavelengths.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.