Color picture tube having improved shadow mask frame

Electric lamp and discharge devices – Cathode ray tube – Shadow mask – support or shield

Patent

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Details

313402, H01J 2907, H01J 2981

Patent

active

050721518

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 maskframe assembly mounted therein by support means located at the four corners of the panel. The shadow mask-frame assembly includes an apertured shadow mask and a peripheral frame to which the mask is attached. The frame has two flanges arranged in an L-shaped cross-section. The support means are attached to the corners of the frame. The improvement comprises the frame being formed by four sections that are welded together at their ends. Each section includes a side of the frame and two angled corners of the frame at each end of each section. The sections overlap each other at their ends, with both of the flanges of each section in surface-to-surface contact with each other. With this construction, the frame has a single thickness along each of its sides and a double thickness at its corners, to provide more rigid attachment locations for the support means.

REFERENCES:
patent: 3516147 (1970-06-01), Seedorff et al.
patent: 4827180 (1989-05-01), Sone et al.
patent: 4931690 (1990-06-01), Kokubu et al.

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