Flat front panel CRT bulb pre-stressed prior to final evacuation

Electric lamp or space discharge component or device manufacturi – Process – Implosion protecting

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220 21A, 445 45, 65 41, 65 42, H01J 926

Patent

active

051885530

ABSTRACT:
A CRT bulb that has been preloaded to counter the atmospheric load placed on the seal area of an evacuated and sealed CRT is disclosed along with methods of constructing the bulb. The front panel is simply supported on the funnel and deflected inwardly during affixation of the panel to the funnel to form the bulb. When the deflection load is removed from the affixed panel, the resultant strain energy imparted to the bulb seal area offsets at least some of the atmosphericly induced strain on the sealed CRT. The bulb has a more evenly balanced stress distribution between the front panel and the funnel seal area than previous flat panel CRTs, enabling the use of thinner front panels and seal land.

REFERENCES:
patent: 2866298 (1958-12-01), Babcock et al.
patent: 3894858 (1975-07-01), Rogers
patent: 4152036 (1979-05-01), Corson
patent: 4720657 (1985-12-01), Tischer
patent: 4788471 (1988-11-01), Strauss
patent: 5080622 (1992-01-01), Tuin et al.
Derwent Patent Abstract E7858A/25 for non-English Patent DS 1948-739 dated Jun. 15, 1978.

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