Liquid transmissive filter having anisotropic properties and method of fabrication
US6939014B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 31, 2001 |
| Grant date | Sep 6, 2005 |
| Priority date | — |
| Expiry date | Dec 31, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/045
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical filter includes an array of light-transmissive beads in a matrix of light absorbing binder that surrounds one portion of the beads to provide light entrances and exit apertures for incident light to pass substantially only through the beads. A transparent layer under the light absorbing layer may serve to increase the diameter of the exit apertures. A structure or layer of light-dispersing material that exhibits anisotropic dispersion of incident light along orthogonal axes is disposed relative to the beads to disperse light within a wider output angle along one of the orthogonal axes than along another of the orthogonal axes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.