Optical systems for infrared touch screens
US9128250B2 · kind B2 · utility
8Cited by
7References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 23, 2011 |
| Grant date | Sep 8, 2015 |
| Priority date | — |
| Expiry date | Jan 11, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2203/04104
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
We present optical systems suitable for focusing two substantially collimated beams or sheets of light propagating in different directions onto a common focal point. In some embodiments the optical systems comprise separate focusing elements for each beam or sheet of light, while in other embodiments the optical systems comprise a focusing element and a redirection element. The optical systems have particular application in the receive optics of infrared touch screens, where they enable the detection of additional light paths that assist in the determination of two or more simultaneous touch events.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.