Touch control system for use with or having a three-dimensionally curved touch surface
US4642423A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 30, 1985 |
| Grant date | Feb 10, 1987 |
| Priority date | — |
| Expiry date | Aug 30, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/0436
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Apparatus for use in a touch control system for a cathode ray tube, display panel or other touch-controlled device which is capable of recognizing touch positions along a predetermined coordinate axis on a curved touch surface comprises a substrate comprising a sector of a three dimensionally curved surface having a touch surface capable of propagating surface acoustic waves such that a touch on that surface causes a perturbation of a surface wave propagating through the region of the touch. An input surface wave transducer mechanically and acoustically coupled to the touch surface of the substrate, upon excitation launches a burst of surface acoustic waves on the touch surface along a first path which represents a great circle on that surface. The apparatus also includes an array of surface wave reflective elements which are disposed in or on the touch surface of the substrate along the aforesaid first path for directing wave components derived from the burst across the touch surface of the substrate in a progression of transverse paths which intersect the coordinate axis of that surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.