Light-based touch screen using elliptical and parabolic reflectors
US8587562B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 22, 2011 |
| Grant date | Nov 19, 2013 |
| Priority date | — |
| Expiry date | Mar 8, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2203/04104
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A touch screen system, including a housing, a display mounted in the housing, a plurality of light pulse emitters mounted in the housing below the display, a plurality of light pulse receivers mounted in the housing below the display, a first light guide, mounted in the housing along a first edge of the display, including a first substantially parabolic reflective surface for reflecting light pulses transmitted by the emitters, and a first substantially elliptical refractive surface, positioned substantially above the first substantially parabolic reflective surface, for refracting the reflected light pulses over the display, a second light guide, mounted in the housing along an opposite edge of the display, including a second substantially elliptical refractive surface for further refracting the light pulse refracted by the first substantially elliptical refractive surface, and a second substantially parabolic reflective surface, positioned substantially below the second substantially elliptical refractive surface, for reflecting the further refracted light pulses to the receivers, and a calculating unit, mounted in the housing and connected to the receivers, to determine a locati…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.