Method of testing a panel assembly of a color cathode-ray tube

Details Method of testing a panel assembly of a color cathode-ray tube Method of testing a panel assembly of a color cathode-ray tube

H - Electricity

01

J

316/3

H01J 9/42 (2006.01) G01N 21/88 (2006.01)

Patent

CA 1242758

METHOD OF TESTING A PANEL ASSEMBLY OF A COLOR CATHODE-RAY TUBE Abstract of the Disclosure 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 including ultraviolet, but substantially excluding visible, radiation passed through apertures in the mask; and is examined for variations in color from light emitted thereby, whereby the variations in color are indicative of defects in the assembly.

493944

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