Method of testing a panel assembly of a color cathode-ray tube
US4584481A · kind A · utility
8Cited by
4References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 13, 1984 |
| Grant date | Apr 22, 1986 |
| Priority date | — |
| Expiry date | Nov 13, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J9/42
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method of testing a panel assembly of a color cathode-ray tube, prior to sealing a faceplate panel of the assembly to a funnel section of the tube, detects defects in the assembly including dents and misregistration of an apertured shadow mask mounted therein adjacent to a luminescent screen disposed on the faceplate panel. The screen is exposed to radiation passed through apertures in the mask including ultraviolet but substantially excluding visible radiation, and examined for variations in color from light emitted by the screen, whereby the variations in color are indicative of defects in the assembly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.