Method for preparing an optical element which colors in a non-uniform linear pattern
US11084236B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 10, 2015 |
| Grant date | Aug 10, 2021 |
| Priority date | — |
| Expiry date | Mar 10, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C7/102
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method for preparing an optical element which colors in a non-uniform linear pattern is provided. The method includes (I) providing an optical element which previously has been treated with a photochromic composition containing at least one first photochromic material, the photochromic composition having an absorbance spectrum in the region of photochromic activation; (II) preparing at least one light-absorbing composition containing ultraviolet light absorber, a second photochromic material which is the same or different than the first photochromic material, or mixtures thereof, where the light-absorbing composition has an absorbance spectrum overlapping with that of the photochromic composition in the region of photochromic activation; (III) depositing the light-absorbing composition over the surface of the photochromic optical element in a controlled, predetermined pattern using an inkjet printing apparatus to provide a linearly gradient color pattern upon exposure to actinic radiation; (IV) and drying the composition. An optical element also is provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.