Electrographic apparatus
US4665283A · kind A · utility
12Cited by
10References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 1, 1985 |
| Grant date | May 12, 1987 |
| Priority date | — |
| Expiry date | Nov 1, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/045
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An electrographic apparatus or digitizer has a resistive layer with an active area which operates in conjunction with a stylus or other suitable position locator. An a.c. source or alternatively a signal treatment means is connected to the resistive layer through rows of electrodes and position coordinates of the position locator are developed by the apparatus. Voids or discontinuities are formed in the resistive layer to increase the edge-to-edge resistance of the layer and to provide identical edge-to-edge resistances in the x- and the y-coordinate direction for digitizers which are rectangular and non-square.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.