Simplified touch tablet data device
US4570149A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 15, 1983 |
| Grant date | Feb 11, 1986 |
| Priority date | — |
| Expiry date | Mar 15, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L1/205
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A touch tablet is provided containing two sheets of insulating material each of which contains a plurality of spaced apart conductive lines. A resistive strip on each sheet contacts and connects electrically one end of each of the plurality of conductive lines on that sheet. Each resistive strip functions as a potentiometer. Mounted between the two sheets and spaced apart therefrom is a conductive middle sheet. The first and second sheets are mounted such that the first and second sets of a plurality of conductive lines on these sheets are orthogonal to each other. A user presses on one of the two sheets to bring all three sheets into contact. The impedence of each potentiometer is a function of the contact point. The potentiometer is used as part of an RC circuit to provide a variable time constant representative of the coordinate of the contact point.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.