Deformable touch sensitive surface
US4542375A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 11, 1982 |
| Grant date | Sep 17, 1985 |
| Priority date | — |
| Expiry date | Feb 11, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2203/04109
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A touch sensitive device is arranged with substantially parallel surfaces inside which light from a synchronized source, such as a CRT, can become trapped by total internal reflection. The screen is fitted with photodetectors which respond to the entrapment of light within the surfaces. The device is compliant so that a touch of the device at a particular point will cause an inward deflection of the surface at that point. The deflection causes light to become entrapped within the surface by total internal reflection thus making it possible, by comparing the photodetector output with the CRT raster position, to determine the exact surface position of the touch.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.