Color picture tube with shadow mask-frame assembly

Details Color picture tube with shadow mask-frame assembly Color picture tube with shadow mask-frame assembly

1992-11-17

1993-06-08

Demeo, Palmer C.

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

313406, H01J 2907

Patent

active

052182673

ABSTRACT:
An improved color picture tube includes an evacuated envelope having a rectangular faceplate panel. The panel includes a viewing screen on an inner surface thereof and a shadow mask assembly mounted therein by support means located at the four corners of the panel. The shadow mask assembly includes an apertured shadow mask and a peripheral frame to which the mask is attached. The frame is formed by four sections that are welded together at their ends. Two of the sections are longer than the other two sections and are constructed of a material having a different coefficient of thermal expansion than that of the other two sections. The frame reduces electron beam misregister with elements of the screen.

REFERENCES:
patent: 3516147 (1970-06-01), Seedorff et al.
patent: 4723088 (1988-02-01), Sone et al.
patent: 4728853 (1988-03-01), Sone et al.
patent: 5021707 (1991-06-01), Bauder
patent: 5072151 (1991-12-01), Spina

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