Apparatus for determining planar coordinates
US4306110A · kind A · utility
7Cited by
8References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 7, 1980 |
| Grant date | Dec 15, 1981 |
| Priority date | — |
| Expiry date | Mar 7, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/045
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A pair of overlapping, normally spaced conductive sheets (16,18) have sufficient flexibility between them to permit electrical contact when touched. One sheet has spaced, approximately parallel electrodes (20,21). The other sheet has spaced approximately parallel electrodes (22,23) transverse to the electrodes of the one sheet. A source of electrical power (10,12) is alternatively connected across the electrodes of one sheet to the exclusion of the other sheet. One electrode of each sheet is coupled to a signal processing circuit (32) having a high impedance differential input.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.