Method of forming a color picture tube shadow mask

Details Method of forming a color picture tube shadow mask Method of forming a color picture tube shadow mask

1991-03-11

1993-11-23

Seidel, Richard K.

Electric lamp or space discharge component or device manufacturi

Process

Electrode making

445 49, 72348, H01J 912

Patent

active

052638871

ABSTRACT:
The present invention provides an improved method of forming a shadow mask for a color picture tube from a flat apertured mask. The mask has an central apertured portion, a solid border portion and a skirt portion. The improved method comprises several steps. First, a flat apertured mask is placed beneath an upper punch. Next, the periphery of the mask at the skirt portion is clamped. The punch then is pressed against the mask to contour the mask in its central apertured and solid border portions. Thereafter, the periphery of the mask at the skirt portion is unclamped, and the solid border portion of the mask is pressed between a bead die and the punch to form a peripheral bead in the solid border portion of the mask. Finally, the skirt portion is swept back to substantially parallel a central longitudinal axis of the formed mask, while the border portion is held between the bead die and the punch.

REFERENCES:
patent: 3855493 (1974-12-01), Snook et al.
patent: 4536226 (1985-08-01), Ohtake et al.
patent: 4615205 (1986-10-01), Ragland, Jr.
patent: 4719787 (1988-01-01), Ragland, Jr.
patent: 4746315 (1988-05-01), Sumiyoshi
patent: 4754635 (1988-07-01), van den Berg et al.
patent: 4792318 (1988-12-01), Igaki et al.
patent: 4890471 (1990-01-01), Ito

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