Position determining and digitizing method and device
US4999462A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 6, 1989 |
| Grant date | Mar 12, 1991 |
| Priority date | — |
| Expiry date | Oct 6, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/0443
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A coordinate determining system, tablet, and method wherein the tablet is formed of a sequence of triangular electrodes extending in a first direction, with alternate electrodes having their apexes extending in opposite directions perpendicular to the first direction, and the bases of alternate electrodes are aligned to define the sides of the tablet. The cursor is round, having a diameter substantially equal to the length of the bases of the electrodes, and is adapted to be electrostatically coupled to the electrodes. Signals are sequentially applied to the electrodes and voltages generated at the cursor are employed to address look up tables for determining the location of the cursor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.