Microprocessor controlled system for testing and selectively reconditioning a CRT
US5259800A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 15, 1992 |
| Grant date | Nov 9, 1993 |
| Priority date | — |
| Expiry date | Oct 15, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02W30/82
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A microprocessor controlled system for testing and selectively reconditioning a CRT in accordance with the Beltron process. The microprocessor monitors the function and filament voltage selection switches actuated by an operator. Once the filament voltage and functions have been specified, the microprocessor automatically controls the application of filament voltage, AC voltage and relatively high DC voltage to the CRT and displays the progress and results of the selected function. The system tests the emission characteristics of the cathode in each gun element, causes simultaneous cleaning of the cathode/grid elements by controlling the application of an AC voltage across each cathode/grid circuit while the filament voltage is at an elevated level, and restores those cathode/grid circuits requiring restoration by controlling the application of a relatively high DC voltage to each cathode/grid circuit in serial fashion for the several gun elements while maintaining the filament voltage at an elevated level. The system substantially reduces required operator interaction with the testing and reconditioning procedure and provides a commensurate reduction in the probability of destruct…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.