Stylus sensing system
US5149919A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 26, 1991 |
| Grant date | Sep 22, 1992 |
| Priority date | — |
| Expiry date | Nov 26, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/045
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An improved stylus detection system for use on the surface of a display device. An overlay having horizontal and vertical transparent conductors is coupled to other elements of the systems through a bus having a minimal number of bus wires. A control processor issues command signal which selectively couple transparent conductors to a radiative measuring device to determine stylus position accurately. The system includes a radiative pickup stylus having a spherical antenna which receive the overlay signal independent of the angle at which it is held. Further, a contact detecting mode has been added to eliminate spurious contact position measured between strokes, when the stylus is proximate to but not in contact with the overlay.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.