Electrical position resolving by zero-crossing delay
US4055726A · kind A · utility
Inventors
Key dates
| Filing date | Jun 24, 1976 |
| Grant date | Oct 25, 1977 |
| Priority date | — |
| Expiry date | Jun 24, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/045
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Position responsive apparatus is disclosed comprising a sheet of uniform resistivity having four electrodes in contact therewith around a rectangular area. One pair of parallel electrodes are respectively energized with time-delayed voltage waveforms having linearly increasing portions, and then these voltage waveforms are instead applied to the other pair of parallel electrodes; and this procedure is repeated in sequence. A movable probe makes connection with the resistive layer. The voltage waveform picked off by the probe is found to have a time delay of zero-crossing, measured relative to the zero-crossing of the waveform applied at that time to one of the two electrodes, which is dependent solely upon the position of the probe in the direction perpendicular to that electrode. In this way, the position of the probe within the rectangle defined by the electrodes can be determined.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.