Waveguide design incorporating reflective optics
US7352940B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 7, 2006 |
| Grant date | Apr 1, 2008 |
| Priority date | — |
| Expiry date | Feb 24, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/0421
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
This invention relates to devices for coupling light between an optical waveguide and an optical element in a manner that is substantially independent of temperature, using reflective optics. Certain embodiments of the invention concern improved designs for the transmit and receive optics of a waveguide-based optical touch screen sensor, incorporating reflective optics. The improved designs have substantially temperature independent operation and reduced optical losses. In one preferred embodiment the improved design incorporates a parabolic or quasi-parabolic reflector. In another preferred embodiment the improved design incorporates an elliptical or quasi-elliptical reflector. The transmit and receive elements and associated waveguides preferably comprise photo-patternable polymers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.