Method and apparatus for detecting a multitouch event in an optical touch-sensitive device
US8350831B2 · kind B2 · utility
49Cited by
55References
24Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 7, 2009 |
| Grant date | Jan 8, 2013 |
| Priority date | — |
| Expiry date | Aug 7, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2203/04808
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A touch sensitive optical control device comprising a set of light emitters 14, 22 and light detectors 18, 24 arranged relative to a touchable surface 30 such that light transmitted by the emitters is received by the detectors along multiple intersecting beams which pass transversely of the surface and touching the surface at a beam interrupts the light transmitted along the beam. Candidate touch points T1, T2, F1, F2 are defined at the intersections of interrupted beams and are confirmed or not as actual touch points by examining test beams 40, 42, 54, 56 near to or coincident with the candidate touch point.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.