Color picture tube having shadow mask frame with truncated corne

Details Color picture tube having shadow mask frame with truncated corne Color picture tube having shadow mask frame with truncated corne

1984-05-15

1986-07-08

Willis, Davis L.

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

313402, 313403, 313404, H01J 2980

Patent

active

045995338

ABSTRACT:
An improvement is made in a color picture tube that includes an evacuated envelope having a rectangualr faceplate panel with major and minor axes, wherein a central longitudinal axis of the tube passes through the center of the faceplate perpendicular to the major and minor axes. The faceplate panel includes a shadow mask welded at various points including its corners to a peripheral frame mounted therein. The frame is L-shaped having a first flange approximately paralleling the central longitudinal axis and a second flange extending toward and approximately perpendicular to the central longitudinal axis. The tube improvement comprises the frame having truncated corners wherein the first flange at each of the frame corners is straight, flat and acutely angled with respect to both the major axis and the minor axis. A peripheral portion of the shadow mask conforms to the shape of the first flange and is telescoped thereon. The corner welds attaching the shadow mask to the frame are located approximately at the centers of the straight and flat portions of the truncated corners.

REFERENCES:
patent: 3368098 (1968-02-01), Demmy
patent: 3585431 (1971-06-01), Long
patent: 3585431 (1971-06-01), Long
patent: 3862448 (1975-01-01), Ishizuka et al.
patent: 4056755 (1977-11-01), Sohn
patent: 4099086 (1978-07-01), Roder et al.
patent: 4317064 (1982-02-01), Dougherty
patent: 4387321 (1983-06-01), Gijrath et al.
patent: 4437036 (1984-03-01), Ragland, Jr.

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