Iterative coordinate data approximation system for photoemissive pixel pattern displays
US4020281A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 13, 1976 |
| Grant date | Apr 26, 1977 |
| Priority date | — |
| Expiry date | Feb 13, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/03542
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Almost any Photoemissive Pixel Pattern Display Tube (PPDT) System, such as one for a Photoemmisive Matrix Display Tube (PMDT) display system is capable of supplying an indication of coordinate data for input to data processing systems and the like with this electronic photoresponsive data approximation system. A photoresponsive probe with relatively large optical aperture stop is coupled to suitable electric current amplifying circuitry which in turn is coupled to data resolving circuitry for gating counting circuitry coupled to the display matrixing circuitry for determining the coordinates of the location of the probe in terms of the geometrical dimensions of the display. The probe is arranged for sensing a predetermined differential in photoemission as the cathode ray beam passes through the aperture stop. Conveniently, the aperture stop is circular and from the top the successive intercepted raster scans are longer up to the center of the stop. The electronic circuitry responsive to the probe is arranged for timing the beginning of each scan as intercepted. Upon timing the maximum duration of interception at the center of the aperture stop, one coordinate, y, is determined. The…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.