Front assembly for a tension mask color cathode ray tube having

Details Front assembly for a tension mask color cathode ray tube having Front assembly for a tension mask color cathode ray tube having

1988-08-19

1990-01-02

DeMeo, Palmer C.

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

313407, 445 30, 445 37, H01J 2907, H01J 918

Patent

active

048915440

ABSTRACT:
A faceplate assembly for a color cathode ray tube is disclosed that includes a glass faceplate having on its inner surface a centrally disposed phosphor screen. A foil shadow mask is mounted in tension on a mask-support structure of tightly controlled uniform height located on opposed sides of the screen and secured to the inner surface by a devitrified solder glass. The assembly according to the invention has a plurality of spacing elements of tightly controlled uniform height located between the support structure and the inner surface of the faceplate, and extending through the solder glass to provide intimate contact with the inner surface. The tightly controlled uniform heights of the support structure and the spacing elements provide for tightly controlled uniform spacing between the mask and screen throughout the length of the support structure. A process for manufacturing a faceplate assembly according to the invention is also disclosed.

REFERENCES:
patent: 3894321 (1975-07-01), Moore
patent: 4121131 (1978-10-01), van Esdonk et al.
patent: 4730143 (1988-03-01), Fendley
patent: 4739217 (1988-04-01), Fendley et al.

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