Arrangement for use with a touch control system having a spherically curved touch surface
US4825212A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 14, 1986 |
| Grant date | Apr 25, 1989 |
| Priority date | — |
| Expiry date | Nov 14, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/0436
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A touch control system for a cathode ray tube, or other touch-controlled device capable of recognizing touch positions along a predetermined coordinate axis on a three-dimensionally curved touch surface, includes a substrate comprising a segment of a three-dimensionally curved surface having a touch surface capable of propagating surface acoustic waves. An input surface wave transducer serves to launch a collimated beam of surface acoustic wave energy on the touch surface. If undisturbed, the beam would travel along a path that corresponds to a great circle on the curved surface. An output surface wave transducer develops an electrical output signal upon receipt of surface acoustic wave energy derived from the beam. A reflective array is provided which establishes travel of the beam of energy along a desired path on the touch surface having a contour intermediate a great circle and a parallel. The array has the property of reducing the velocity of surface acoustic wave energy configured and of sufficient density to produce within the array a wave guiding action upon the beam of acoustic wave energy along the desired path effective to confine the beam of energy to the desired path h…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.